... Ayhan KESİMAl/5 Erol YELMAZ(W) Bayram ERÇIKDI(*W) İbrahim ALP( ""} Mehmet YUMLU'****Berkant ÖZDEMÎR ... The use of pozzolanic products (fly ash and blast furnace slags) based binders are resistant to sulphate attack,... more
... Ayhan KESİMAl/5 Erol YELMAZ(W) Bayram ERÇIKDI(*W) İbrahim ALP( ""} Mehmet YUMLU'****Berkant ÖZDEMÎR ... The use of pozzolanic products (fly ash and blast furnace slags) based binders are resistant to sulphate attack, generaly reduces any strength deterioration. ...
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Kadir Karaman1*, İbrahim Alp1, Ayhan Kesimal1, Ali Osman Yılmaz1 Karadeniz Technical University, Faculty of Engineering, Mining Engineering, Trabzon, TURKEY. * Sorumlu Yazar e-posta: kadirkaraman@ktu.edu.tr, ORCID ID:... more
Kadir Karaman1*, İbrahim Alp1, Ayhan Kesimal1, Ali Osman Yılmaz1 Karadeniz Technical University, Faculty of Engineering, Mining Engineering, Trabzon, TURKEY. * Sorumlu Yazar e-posta: kadirkaraman@ktu.edu.tr, ORCID ID: http://orcid.org/0000-0002-3831-4465 ialp@ktu.edu.tr, ORCID ID: http://orcid.org/ 0000-0002-6032-3528 kesimal@ktu.edu.tr, ORCID ID: http://orcid.org/ 0000-0002-9890-8273 aoyilmaz@ktu.edu.tr, ORCID ID: http://orcid.org/ 0000-0003-3192-8533
This paper presents the effect of the natural pozzolans as mineral additives on the short- and long-term strength and stability performance of cemented paste backfill (CPB) samples. Prior to their use in CPB studies, the natural pozzolans... more
This paper presents the effect of the natural pozzolans as mineral additives on the short- and long-term strength and stability performance of cemented paste backfill (CPB) samples. Prior to their use in CPB studies, the natural pozzolans — the volcanic tuffs (Akkus Trass [AT] and Fatsa Trass [FT]) and pumice (KP) — were tested for their pozzolanic characteristics. These tests revealed that the pozzolanic activity of the natural pozzolans is closely inter-related with their content of reactive silica and, accordingly, KP has the highest pozzolanic activity. The addition, or increasing the amount, of natural pozzolans in the binder phase resulted in a slower rate of strength development of CPB samples. The deterioration in stability of CPB samples prepared from Portland cement (PC) alone ( i.e. a strength loss of 24.6%) occurred following 56 days. The replacement of PC with FT and AT led to even higher losses in strength. However, the addition of KP (up to 30 wt%) mitigated, to a cer...
Research Interests: Environmental Engineering, Civil Engineering, Materials Science, Chemistry, Minerals, and 15 moreWaste Management, Mining, Medicine, Soil Cementation, Pozzolan, Compressive Strength, Sulfides, Volcanic eruptions, Industrial Waste, Refuse disposal, Portland cement, Silicates, Pozzolana, Cementation, and Pozzolanic Activity
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ABSTRACT The sorptive removal of arsenic from water by synthetically-prepared magnetic Fe-hydrotalcite (MFeHT) seeding by nano magnetite was investigated. The synthesis of M-FeHT was achieved by a coprecipitation method. M-FeHT was... more
ABSTRACT The sorptive removal of arsenic from water by synthetically-prepared magnetic Fe-hydrotalcite (MFeHT) seeding by nano magnetite was investigated. The synthesis of M-FeHT was achieved by a coprecipitation method. M-FeHT was characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), and magnetic susceptibility analysis. Batch tests were conducted to investigate the removal mechanism of As(III) and As(V) by M-FeHT. Kinetic studies revealed that uptake of As(V) (95% removal) and As(III) ions occurs rapidly within the first 15 min, and slows thereafter. The adsorption data follow a pseudo-second-order kinetic model and fit the Langmuir isotherm well. The experimental results show that stable arsenic removal efficiency, and the capability to reduce As levels, make M-FeHT a suitable adsorbent for the treatment of As-polluted waters. After adsorption, tests were conducted with magnetic separation to determine the separability of M-FeHT from solution. At magnetic field intensity of 2 T, the efficiency of M-FeHT separation was 91%. Finally, after adsorption by M-FeHT, residual arsenic concentration decreased to less than 10 mg/L (i.e., below the threshold specified by the WHO). Fehydrotalcite-supported magnetite nanoparticles were not only more efficient in the removal of As but also in recovery by the magnetic separator.
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Research Interests: Engineering, Construction Materials, Hazardous Waste, Environmental Risk, Raw materials, and 12 moreHeavy Metal Pollution, Heavy Metal, Sulfides, Hazardous Materials, Iron, Chemical Industry, Industrial Waste, Chemical Composition, Portland cement, Pilot Projects, Sulphuric Acid, and Environmental Problem
Copper slag wastes, even if treated via processes such as flotation for metal recovery, still contain heavy metals with hazardous properties posing environmental risks for disposal. This study reports the potential use of flotation waste... more
Copper slag wastes, even if treated via processes such as flotation for metal recovery, still contain heavy metals with hazardous properties posing environmental risks for disposal. This study reports the potential use of flotation waste of a copper slag (FWCS) as iron source in the production of Portland cement clinker. The FWCS appears a suitable raw material as iron source containing >59% Fe(2)O(3) mainly in the form of fayalite (Fe(2)SiO(4)) and magnetite (Fe(3)O(4)). The clinker products obtained using the FWCS from the industrial scale trial operations over a 4-month period were characterised for the conformity of its chemical composition and the physico-mechanical performance of the resultant cement products was evaluated. The data collected for the clinker products produced using an iron ore, which is currently used as the cement raw material were also included for comparison. The results have shown that the chemical compositions of all the clinker products including those of FWCS are typical of a Portland cement clinker. The mechanical performance of the standard mortars prepared from the FWCS clinkers were found to be similar to those from the iron ore clinkers with the desired specifications for the industrial cements e.g. CEM I type cements. Furthermore, the leachability tests (TCLP and SPLP) have revealed that the mortar samples obtained from the FWCS clinkers present no environmental problems while the FWCS could act as the potential source of heavy metal contamination. These findings suggest that flotation wastes of copper slag (FWCS) can be readily utilised as cement raw material due to its availability in large quantities at low cost with the further significant benefits for waste management/environmental practices of the FWCS and the reduced production and processing costs for cement raw materials.
Research Interests: Engineering, Construction Materials, Metallurgy, Waste Management, Poland, and 15 moreQuality Control, Environmental Risk, Raw materials, Copper, Heavy Metal, Hazardous Materials, Data Collection, Iron, Solubility, Heavy Metal Contamination, Particle Size, Industrial Waste, Chemical Composition, Portland cement, and Environmental Problem
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This paper describes a study of the sorptive removal of arsenate (As(V)) from aqueous solutions by synthetically prepared Mg-Fe-based hydrotalcites (FeHT) as layered double hydroxide (LDH) adsorbents. The synthesis of Fe(3+)-substituted... more
This paper describes a study of the sorptive removal of arsenate (As(V)) from aqueous solutions by synthetically prepared Mg-Fe-based hydrotalcites (FeHT) as layered double hydroxide (LDH) adsorbents. The synthesis of Fe(3+)-substituted hydrotalcites (FeHT) with the chemical formula [Mg(II)(6)Fe(III)(2)(OH)(16)](2+)[CO(3)xyH(2)O](2-) was achieved by a co-precipitation method. The reaction products were characterized by powder X-ray diffraction analysis. The influences of solution pH, initial arsenate (As(V)) concentration, and sorbent concentration were investigated in multiple kinetic runs. The adsorption rates and isotherms were investigated in batch experiments. The pseudo-first-order and second-order kinetic models were tested and the latter was found to fit better to the experimental data. Langmuir and Freundlich isotherms were used to describe the adsorption data from equilibrium experiments. The results have shown that FeHT has a high arsenate removal efficiency, with the ability to reduce the concentration of arsenate in the aqueous solution from an initial value of 330 microg/l to <10 microg/l (i.e. below the limit value specified by WHO).
Research Interests: Engineering, Kinetics, Arsenic, Adsorption, Magnesium, and 15 moreTemperature, Hazardous Materials, Iron, Second Order, First Order Logic, Lumping Kinetic Model, Aqueous Solution, Experimental Data, Magnesium Hydroxide Industry Trend, Arsenates, Aluminum Hydroxide, Layered Double Hydroxide, Freundlich Isotherm, Adsorption kinetic, and Removal Efficiency
In this study, the potential use of the industrial waste products including waste glass (WG), fly ash (FA), granulated blast furnace slag (GBFS) and silica fume (SF) as pozzolanic additive for the partial replacement of ordinary Portland... more
In this study, the potential use of the industrial waste products including waste glass (WG), fly ash (FA), granulated blast furnace slag (GBFS) and silica fume (SF) as pozzolanic additive for the partial replacement of ordinary Portland cement (OPC) in cemented paste backfill (CPB) of sulphide-rich mill tailings was investigated. The influence of these industrial waste products on the short- and long-term mechanical performance of CPB was demonstrated. The rate of development of strength of CPB samples tended to slow down when the pozzolanic wastes were incorporated or increased in dosage in the binder phase. Severe losses (by 26%) in the strength of CPB samples produced from exclusively OPC occurred after an initial curing period of 56 days. The addition of WG (10-30 wt%) as a partial replacement of OPC was observed to aggravate further the strength losses of CPB samples. GBFS, FA and SF appeared to improve the long-term performance of CPB samples; albeit, only GBFS and SF could be incorporated into the binder phase only at certain levels i.e. up to 20 wt% GBFS and 15wt% SF in order to maintain a threshold strength level of 0.7MPa over 360 days. SEM studies have provided further insight into the microstucture of CPB and confirmed the formation of deleterious gypsum as the expansive phase. These findings have demonstrated that the industrial waste products including GBFS and SF can be suitably used as mineral additives to improve the long-term mechanical performance of CPB produced from sulphide-rich tailings as well as to reduce the binder costs in a CPB plant.
Research Interests: Engineering, Manufacturing, Glass, Scanning Electron Microscopy, Waste Management, and 15 moreMining, Solid waste, Sulfides, Fabrication, Hazardous Materials, Fly Ash, Hazardous, Industrial Waste, Blast furnace Slag, Tailings, Long Term, Silica Fume, Ordinary Portland Cement, Slag, and Cemented paste backfill
Adsorption of As(V) from Water Using Nanomagnetite. [Journal of Environmental Engineering 136, 399 (2010)]. Tuğba Türk, İbrahim Alp, Hacı Deveci. Abstract. This paper describes a study of the removal of arsenate [As(V)] from ...
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ABSTRACT Potassium hydroxide alkaline pretreatment of a refractory gold-silver ore containing 20 g/t Au and 220 g/t Ag was investigated with the purpose to evaluate its effectiveness on the extraction of gold and silver. The presence of... more
ABSTRACT Potassium hydroxide alkaline pretreatment of a refractory gold-silver ore containing 20 g/t Au and 220 g/t Ag was investigated with the purpose to evaluate its effectiveness on the extraction of gold and silver. The presence of antimony minerals such as stibnite (Sb2S3), zinkenite (Pb9Sb22S42) and andorite (Sb3PbAgS6) is the main reason for the refractory nature of the ore. Silver occurs as andante, a Au-Ag alloy, tetrahedrite [(Cu,Fe,Zn,AS)(12)Sb4S13] and in minor amounts in zinkenite whereas gold is associated with quartz and the antimony minerals. Cyanidation tests of the as-received ore show that the extraction of gold and silver is consistently low (i.e. <= 49.3% and <= 18.7%, respectively) over the leaching period of 24 h. The effects of potassium hydroxide concentrations (0.5-5 mol/L), temperature (20-80 degrees C) and particle size (5-50 mu m) on the removal efficiency of antimony were investigated. Accompanying the removal of antimony, gold and silver recoveries improved with increases in the KOH concentrations (5 mol/L) and temperature (80 C), and a decrease in the particle size (5 gm). Gold and silver extractions during subsequent cyanidation were improved to 87.6% and 94.5%, respectively, corresponding to 85.5% Sb removal by alkaline pretreatment. The antimony removal is also evidenced by the disappearance of stibnite, zinkenite and andorite which formed 4.57 wt.% of the original ore. The residual amount of antimony is due to the presence of unreactive Sb oxide and Pb-Sb sulphate minerals, sphalerite and tetrahedrite in the ore and Sb-bearing Pb sulphate compound(s) that formed during pretreatment. These findings indicate that potassium alkaline leaching can be an effective pretreatment method for refractory antimonial gold-silver ores. (c) 2014 Elsevier B.V. All rights reserved.
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... Oktay Celep a , İbrahim Alp a , low asterisk , E-mail The Corresponding Author , Doğan Paktunç b and Yves Thibault b. ... This finding was consistent with reports on leaching of antimonial sulfides such as stibnite ([Anderson and... more
... Oktay Celep a , İbrahim Alp a , low asterisk , E-mail The Corresponding Author , Doğan Paktunç b and Yves Thibault b. ... This finding was consistent with reports on leaching of antimonial sulfides such as stibnite ([Anderson and Krys, 1993], [Ubaldini et al., 2000], [Smincáková and ...
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The pretreatment of an antimonial refractory gold and silver ore was investigated using alkaline sulphide leaching. The ore assayed 20g/t Au and 220g/t Ag and contained predominantly quartz/clay and barite, and to a lesser extent,... more
The pretreatment of an antimonial refractory gold and silver ore was investigated using alkaline sulphide leaching. The ore assayed 20g/t Au and 220g/t Ag and contained predominantly quartz/clay and barite, and to a lesser extent, sulphides such as pyrite, stibnite, sphalerite, zinkenite (Pb9Sb22S42) and andorite (Sb3PbAgS6). The latter mineral was identified to be the most important sulphide phase for the
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Page 1. Kibited 1(4) (2010) G39 G52 Çift tabakalı hidroksit'ler (ÇTH) ve Arsenik giderimindeki uygulamaları Tuğba TÜRK * Karadeniz Teknik Üniversitesi, Maden Mühendisliği Bölümü,61080, Trabzon tugbaturk@yahoo.com.tr ...
In this study; the potential use of arsenical borogypsum wastes (ABW) as a set retarder in cement industry was investigated. The comparative performances of arsenical borogypsum wastes (ABW) and natural gypsum samples (NG1 and NG2) at... more
In this study; the potential use of arsenical borogypsum wastes (ABW) as a set retarder in cement industry was investigated. The comparative performances of arsenical borogypsum wastes (ABW) and natural gypsum samples (NG1 and NG2) at different proportions in the range of 3-8 wt % were tested based on compressive strength over 1, 2, 7, and 28 days and setting times. The use of ABW was observed to lead to a somewhat slower rate of development of strength of the mortar samples than those of NG1 and NG2 during the curing period of 7 days. This is the indication of the effectiveness of ABW as a set retarder. The 28-day compressive strength of mortars tended to decrease with the addition or increasing the proportion of ABW, beyond 5 wt % in particular. The data for setting times of the cement products confirmed set retarding characteristics of ABW with an initial setting time of 90-120 min at 3-5 wt % dosage, which conforms to the desired setting time of > or = 60 min for CEM I (42.5 N) type cement (TS EN 197-1). Leachability tests (TCLP and SPLP) have also shown that ABW can be classified as a nonhazardous waste; but it can readily release metals such as As and Mn, in particular, whereas the mortar samples containing ABW-cement clinker present no environmental concern with its remarkably reduced leachability.
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ABSTRACT This paper describes a study of the sorptive removal of arsenite (As(III)) from aqueous solutions by commercial Nanomagnetite (NM). We also investigated the adsorption mechanism of arsenite (As(III)) onto the NM. The influences... more
ABSTRACT This paper describes a study of the sorptive removal of arsenite (As(III)) from aqueous solutions by commercial Nanomagnetite (NM). We also investigated the adsorption mechanism of arsenite (As(III)) onto the NM. The influences of solution pH, initial arsenite (As(III)) concentration and sorbent concentration were investigated in multiple kinetic runs. The adsorption rates and isotherms were investigated in batch experiments. We evaluated fits to the experimental data of the pseudo first order and pseudo second order kinetic models and determined that our system was best described by the second order model. Langmuir and Freundlich isotherms were used to fit the adsorption data from equilibrium experiments. According to results of As removal measurements, NM has a high arsenite removal efficiency, with the ability to reduce the concentration of arsenite in the aqueous solution from an initial value of 300 μg/L to <5 μg/L.
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... CHARACTERIZATION OF ORGANO-BENTONITES OBTAINED FROM DIFFERENT LINEAR-CHAIN QUATERNARY ALKYLAMMMONIUM SALTS. lker Erkan 1 , brahim Alp 1 ,* and Mehmet Sabri Çelik 2 ... Chiang Mai Journal of Science, 35, 199205.[Web of Science]. ...
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In this study, the influence of binder type and dosage on the mechanical properties and microstructure of cemented paste backfill (CPB) was investigated using ordinary Portland cement (OPC), Portland composite cement (PCC) and sulphate... more
In this study, the influence of binder type and dosage on the mechanical properties and microstructure of cemented paste backfill (CPB) was investigated using ordinary Portland cement (OPC), Portland composite cement (PCC) and sulphate resistant cement (SRC). The CPB samples of OPC and PCC were observed to lose their unconfined compressive strengths (UCSs) after 56days. This could be associated with
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ABSTRACT In this study, physical, chemical and hazardous characteristics of computer printed circuit boards (PCBs) were studied. PCBs manually obtained from end-of-life computers of various brands were subjected to size reduction down to... more
ABSTRACT In this study, physical, chemical and hazardous characteristics of computer printed circuit boards (PCBs) were studied. PCBs manually obtained from end-of-life computers of various brands were subjected to size reduction down to -3.35 mm in two stages of crushing. Size fractions were obtained by dry-sieving and used to determine the liberation size of metals. Furthermore, hazardous characteristics of PCBs were investigated using standard protocols including TCLP (Toxicity Characteristic Leaching Procedure) and SPLP (Synthetic Precipitation Leaching Procedure) tests of US Environmental Agency (USEPA), ASTM D-3987 and EN 12457-2 tests to simulate different environmental scenario. The tests have shown that printed circuit boards can be classified as hazardous wastes. Copper content of PCBs was found to be 15.5 per cent. © (2010) by the Australasian Institute for Mining and Metallurgy (AusIMM).
ABSTRACT In this study, the amenability of Mastra gold ore to centrifugal gravity separation was investigated using a Knelson concentrator in the light of the mineralogical examinations. Because Mastra ore contains relatively coarse gold... more
ABSTRACT In this study, the amenability of Mastra gold ore to centrifugal gravity separation was investigated using a Knelson concentrator in the light of the mineralogical examinations. Because Mastra ore contains relatively coarse gold particles (a mean diameter of 30 ìm), centrifugal gravity separation could be used prior to or in place of cyanidation. Recovery tests on the ground ore (80% passing -75 ìm) have demonstrated that 47,2% of the gold present in the ore can be recovered into a concentrate assaying 771.95 g/t Au. These findings indicate that the ore is amenable to centrifugal gravity separation, which can be employed as a pre/concentration method using a Knelson separator ahead of cyanidation.
... 1Dept. of Mining Eng., Karadeniz Technical University, 61080, Trabzon, Turkey 2Trabzon Cement Co., 61080, Trabzon, Turkey Email: ialp@ktu.edu.tr ... 20662071. 5. Chakchouk, A., Samet, B. & Mnif, T. (2006). Study on the potential... more
... 1Dept. of Mining Eng., Karadeniz Technical University, 61080, Trabzon, Turkey 2Trabzon Cement Co., 61080, Trabzon, Turkey Email: ialp@ktu.edu.tr ... 20662071. 5. Chakchouk, A., Samet, B. & Mnif, T. (2006). Study on the potential use of Tunisian clays as pozzolanic material. ...
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Altin/Gumus minerallerini iceren cevher yataklarinda cogunlukla belirli bir miktarda agir metal ve toksisitesi yuksek olan civa bulunmaktadir. Altinin siyanur ile muamelesi esnasinda altin ve gumusle birlikte civa da lic edilmektedir.... more
Altin/Gumus minerallerini iceren cevher yataklarinda cogunlukla belirli bir miktarda agir metal ve toksisitesi yuksek olan civa bulunmaktadir. Altinin siyanur ile muamelesi esnasinda altin ve gumusle birlikte civa da lic edilmektedir. Civa-siyanur kompleksleri cok kararli olduklarindan lic cozeltisinde ve lic islemini takip eden proseslerde kirlilige sebep olmakla birlikte cevre ve saglik acisindan tehlike arz etmektedir. Bu nedenle civanin; hizli, verimli, dusuk maliyetli, secimli, kararli ve tehlikeli olmayan ayirma yontemleri ile uzaklastirilmasi ekonomik ve cevresel acidan oldukca onemlidir. Bu calismada; altin, gumus ve civa iceren siyanurlu lic cozeltilerinden sodyum sulfur (Na 2 S), sodyum dietilditiyokarbamat (Na-DDC) ve amonyum pirolidin ditiyokarbamat (APDC) kullanimiyla cokturme ile civa uzaklastirma arastirilmistir. Ayrica koagulant (FeCl 3 ) ve flokulant (Superfloc A130) ilavesinin civa uzaklastirma verimine etkisi incelenmistir. Cokturme ile uzaklastirmada APDC kullani...
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Page 1. 43 THE EFFECT OF MINERALOGICAL STRUCTURE ON THE CYANIDATION OF GOLD ORES Oktay CELEP, İbrahim ALP, Hacı DEVECİ Karadeniz Technical University, Mining Engineering Department, Trabzon/Turkey Mithat VICIL ...
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In recent years, the industrial use and importance of boron compounds has further increased with the potential application of boron as hydrogen carrier in the form of BH4 in the exploitation of hydrogen as clean energy. Boron compounds... more
In recent years, the industrial use and importance of boron compounds has further increased with the potential application of boron as hydrogen carrier in the form of BH4 in the exploitation of hydrogen as clean energy. Boron compounds can be produced from a variety of boron minerals and boronrich brines. Colemanite (Ca2B6O11.5H2O), ulexite (NaCaB5O6(OH)6.5H2O) and borax (Na2B4O5(OH)4.8H2O) are the most important boron minerals of commercial interest. Colemanite is extensively used in the production of boric acid and preferentially in the textile and glass industries where sodium content is often undesirable1. Turkey is the largest producer of colemanite concentrates and boron compounds. In Kestelek plant (Turkey), the colemanite ore produced from open pits is processed to produce saleable colemanite concentrates of 90.000 ton per annually. Processing of the ore (25–35 wt.% B2O3) involves size reduction, screening, washing, scrubbing and handsorting stages to remove clay minerals an...
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This paper presents the effect of binder type, binder proportion and water-to-cement ratio on the short- and long-term unconfined compressive strength (UCS) of cemented paste backfill (CPB). Ordinary Portland cement (OPC), Portland... more
This paper presents the effect of binder type, binder proportion and water-to-cement ratio on the short- and long-term unconfined compressive strength (UCS) of cemented paste backfill (CPB). Ordinary Portland cement (OPC), Portland composite cement (PCC) and sulphate resistant cement (SRC) were used as the binders to prepare CPB samples from sulphide-rich tailings. The experimental results showed that neither OPC nor PCC were effective, since the loss of stability of CPB samples was observed after a curing period of 56 days. However, sulphate-resistant-based cements (SRC and a mix of OPC and SRC) produced good long-term strengths and stability. CPB samples at 7 wt.% binder dosage produced 1.5 to 1.9 fold higher UCS values than those at 5 wt.% binder dosage on all curing days. In addition, no strength loss was found to occur at 7 wt.% binder dosage in contrast to that noted at 5 wt.%. The UCS of CPB samples prepared from PCC at 5wt.% binder dosage were observed to increase with decreasing water-to-cement ratio. This study has revealed that binder type, binder proportion and water-to-cement ratio are of practical importance for the strength of CPB material in the short- and long-term.
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Magnetic separation has been used widely since 1955 for processing a variety of minerals from iron ore in steel production to desulphurization of coal. The accumulation of fines and tailing during mineral processing operations and the... more
Magnetic separation has been used widely since 1955 for processing a variety of minerals from iron ore in steel production to desulphurization of coal. The accumulation of fines and tailing during mineral processing operations and the increasing global demand for quality products motivated the use of the semi-continuous pilot wet high gradient magnetic separator. In this study the possibility of recover the chromites from the tailings of the chromite enrichment plant, by vertical ring and pulsating high gradient wet magnetic separator (VPHGMS) was investigated. Magnetic separation and concentration experiments were studied on pilot scale laboratory with 1-5 tons tailing materials. Tailings were fed first to hydrocyclone then the bottom fluid of the cyclone was fed to magnetic separator. Pre concentrate, obtained by magnetic separator, was beneficiated by shaking tables as a final enrichment step. On the experimental studies different currents (100-400 amperages) were studied to find...
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Dogu Karadeniz Bolgesi’nde madencilik faaliyetleri cok eski caglara kadar uzanmaktadir. Bolgenin bircok yerinde izabesi yapilmis maden atiklarina rastlanilmaktadir. Bolgenin metal madenciligi acisindan zengin olmasi nedeniyle atiklarin... more
Dogu Karadeniz Bolgesi’nde madencilik faaliyetleri cok eski caglara kadar uzanmaktadir. Bolgenin bircok yerinde izabesi yapilmis maden atiklarina rastlanilmaktadir. Bolgenin metal madenciligi acisindan zengin olmasi nedeniyle atiklarin buyuk bir cogunlugu metal madenciligine aittir. Halen cesitli yerlerde soz konusu maden galerileri mevcut olup, bircogu eski caglara ait olmakla birlikte yakin zamana ait arama-isletme amacli kullanilmis galeriler de bulunmaktadir. Terk edilme esnasinda genellikle galerilerde gerekli guvenlik tedbirleri alinmamakta, bu durum zaman zaman yaralanmalara hatta can kayiplarina neden olmaktadir. Bu calismada, veri toplayan bir universite ogrencisinin hayatina mal olan bir olayin etrafinda, eski maden galerilerinde is guvenligi acisindan sakli riskler incelenmekte, degisik amaclarla (inceleme, numune alma, kurtarma vb.) bu galerilere girecek degisik meslek grubundaki kisilerin almasi gereken onlemler belirli bir cercevede incelenmektedir
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Since arsenic is highly toxic and carcinogenic, it now causes serious health problems all over the world. Therefore, there is an urgent need to develop new techniques that are cost-effective and easily applicable to remove arsenic from... more
Since arsenic is highly toxic and carcinogenic, it now causes serious health problems all over the world. Therefore, there is an urgent need to develop new techniques that are cost-effective and easily applicable to remove arsenic from contaminated waters. Layer double hydroxides have the potential to be a good adsorbent to remove arsenic from contaminated waters due to high surface area and high anion exchange capacity. In this paper, arsenic removal from water by calcined Fe–hydrotalcite (CFeHT) known as layered double hydroxide and prepared synthetically with coprecipitation method was researched. The study brings out that the effect of initial solution pH values was limited for the adsorption. The experimental study indicates that the adsorption of arsenic rapidly occured in comparison with other studies. It was determined that the pseudo-second-order kinetic model was more suitable than the first order. In isotherm studies, it was seen that the experimental data were compatible with Langmuir model. In this study was determined that CFeHT has a high arsenic removal potential. And also the concentration of the arsenic solution (600 µg/L) has been reduced below the allowable value by the World Health Organization (< 10 µg/L). The desorption test indicates that the desorption ratio of As(V) was obtained as 72.7.
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OZ: Dunyada macun dolgu teknolojisinin gelisimi ve bundan faydalanimi son yirmi senedir buyuk bir gelisme kaydetmistir. Madencilik sektoru, yeraltinda genis uretimli acik alanlarin doldurulmasi ile ilgili maliyeti azaltici bu teknoloji... more
OZ: Dunyada macun dolgu teknolojisinin gelisimi ve bundan faydalanimi son yirmi senedir buyuk bir gelisme kaydetmistir. Madencilik sektoru, yeraltinda genis uretimli acik alanlarin doldurulmasi ile ilgili maliyeti azaltici bu teknoloji ile ozellikle ilgilenmektedir. En buyuk avantaji, ozellikle asit ureten atiklar da, buyuk miktardaki tesis atiklarinin (%60) yeraltinda cevheri alinmis bolgelere yerlestirilmesidir. Bu calisma, dolgunun mekanik mukavametine etki eden mineralojik ve kimyasal ozelliklerinin sulfurce zengin cimentolu macun dolgu uzerinde davranisindaki gelismeleri ortaya koymaktadir. Bu durum arazi de cimentolu macun dolgu orneklerinin uzun donemli mekanik ozelliklerinin incelenmesi ile ele alinmistir. Anahtar kelimeler: Macun dolgu, reolojik indeks, baglayici malzeme, dayanim. ABSTRACT: The development and utilization of paste backfill technology has been evolving over the last two decades around the world. The mining industry was particularly interested in the technology for reducing costs associated with backfilling large open stopes. A significant environmental advantage, especially when tailings are acid generating, is that a large amount of tailings up to 60 percent can be disposed underground. This paper presents the behavior of cemented paste backfill with sulphide-rich, namely the chemical and mineralogical changes with time that affect the mechanical strength of the fill. This phenomena are illustrated with a case study that demonstrates the long-term mechanical properties of a cemented paste backfill sampled in situ.
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... As a result of recent research, the introduction of liquid nitrogen free silicon drifted detectors (SDDs), stable digital scanning electron microscopes and high-resolution backscatter electron detectors coupled with unique... more
... As a result of recent research, the introduction of liquid nitrogen free silicon drifted detectors (SDDs), stable digital scanning electron microscopes and high-resolution backscatter electron detectors coupled with unique mineralogical features enabled the automatic mineralogical ...