... a Mining Engineering Department, Cumhuriyet University, 58140 Sivas, Turkey. ... cyclone [8].... more ... a Mining Engineering Department, Cumhuriyet University, 58140 Sivas, Turkey. ... cyclone [8]. The BoxBehnken experimental design method has been employed for modeling and optimization of a multi-gravity separator to produce a celestite concentrate by Aslan [9]. Response ...
A three-level Box-Behnken factorial design combining with a response surface methodology (RSM) wa... more A three-level Box-Behnken factorial design combining with a response surface methodology (RSM) was employed for modeling and optimizing three operations parameters of the flotation on lead flotation. The flotation studies of lead ores containing 7.1% Pb were carried out in this study. The variables studied were potassium amyl xanthate (KAX) as a collector, sodium sulfide (Na 2 S) and pH. Experiments were carried out using Box-Behnken factorial design. The main and interaction effects were evaluated using response surface methodology. Second order response functions were produced for both the Pb grade and recovery. These response functions were then optimized using the quadratic programming method to maximize Pb grade and recovery within the experimental range studied. The optimum composition was found to be 212 g/t KAX, 1250 g/t sodium sulfide and 9 pH to achieve the maximum Pb grade. The model prediction of 47.44% Pb at optimum conditions was higher than any value obtained in the initial experiments conducted. In the same way, the optimum composition was found to be 100 g/t KAX, 1250 g/t Na 2 S and 7 pH to achieve the maximum recovery. The model prediction of 84.58% recovery at optimum conditions was also higher than any value obtained in the initial experiments conducted.
In this study, a three-level Box-Behnken factorial design combined with response surface methodol... more In this study, a three-level Box-Behnken factorial design combined with response surface methodology (RSM) for modeling and optimizing of some operations parameter of Multi-Gravity Separator (MGS) to produce a celestite concentrate was developed. The three significant operational parameters of MGS, which are drum speed, tilt angle and shake amplitude, were varied and the results evaluated with the Box-Behnken factorial design. Second-order response functions were produced for the celestite grade and recovery of the concentrate. Taking advantage of the quadratic programming, a drum speed of 150 rpm, tilt angle of 6°and shake amplitude of 20 mm have been determined as optimum levels to achieve the maximum SrSO 4 concentrate grade of 96.91%, whereas the maximum level of grade was 95.69% in the tests conducted or predicted. In the same way, a drum speed of 250 rpm, tilt angle of 2°and shake amplitude of 10 mm has been determined as optimum levels to achieve the maximum recovery of 98.35%, whereas it was 95.83% in the tests conducted or predicted.
Transactions of Nonferrous Metals Society of China, 2013
ABSTRACT The application of the response surface methodology and the central composite design (CC... more ABSTRACT The application of the response surface methodology and the central composite design (CCD) technique for modeling and optimization of the influence of some operating variables on copper, molybdenum and rhenium recoveries in a bioleaching process was investigated. Three main bioleaching parameters, namely pH, solid concentration and inoculum percent, were changed during the bioleaching tests based on CCD. The ranges of the bioleaching process variables used in the design were as follows: pH 1.46–2.14, solid concentration 0.95%–11.05%, and inoculum percent 1.59%–18.41%. A total of 20 bioleaching tests were carried out by the CCD method according to software-based designed matrix. Empirical model equations were developed according to the copper, molybdenum and rhenium recoveries obtained with these three parameters. Model equations of responses at the base of parameters were achieved by using statistical software. The model equations were then individually optimized by using quadratic programming to maximize copper, molybdenum and rhenium recoveries individually within the experimental range. The optimum conditions for copper recovery were pH 1.68, solid concentration 0.95% and the inoculum 18.41% (v/v), while molybdenum and rhenium recoveries were 2.18% and 24.41%, respectively. The predicted values for copper, molybdenum and rhenium recoveries were found to be in good agreement with the experimental values. Also jarosite formation during bioleaching tests was also investigated.
The aim of our research was to apply Box-Behnken experimental design and response surface methodo... more The aim of our research was to apply Box-Behnken experimental design and response surface methodology for modeling of some Turkish coals. As a base for this study, standard Bond grindability tests were initially done and Bond work indexes (W i ) values were calculated for three Turkish coals. The Box-Behnken experimental design was used to provide data for modeling and the variables of model were Bond work index, grinding time and ball diameter of mill. Coal grinding tests were performed changing these three variables for three size fractions of coals (À3350 + 1700 lm, À1700 + 710 lm and À710 lm).
In this study, the optimization of some parameters on agglomeration performance of Zonguldak bitu... more In this study, the optimization of some parameters on agglomeration performance of Zonguldak bituminous coal by oil agglomeration was discussed. A three-level Box–Behnken design combining with a response surface methodology (RSM) and quadratic programming (QP) were employed for modeling and optimization some operations parameters on oil agglomeration performance. The relationship between the responses, i.e., grade and recovery, and four process
In this paper, the multi-response optimization of grade and recovery simultaneously using Taguchi... more In this paper, the multi-response optimization of grade and recovery simultaneously using Taguchi quality loss function has been done for Zonguldak/Turkey bituminous coal by oil agglomeration. The controllable factors selected in this investigation are solid content, amount of oil, agitation time and agitation rate. The percentage contribution of each controllable factor has been determined on the performance of oil agglomeration.
A new nitrate-selective liquid-membrane electrode based on the tris(2,2',2"-sali... more A new nitrate-selective liquid-membrane electrode based on the tris(2,2',2"-salicylideneimino)triethylamine-iron(III) complex has been developed. This electrode exhibits a linear Nernstian response over the range 10(-1)-10(-4) M of nitrate, with a slope of 54.3 +/- 0.9 mV per p[NO3]. The effects of the pH and the liquid-membrane composition were also investigated. The lifetime of the electrode is at least one month. The selectivity coefficients for ten monovalent ions were calculated. The preparation procedure of the electrode is very easy and inexpensive. Moreover, the proposed electrode was applied for the determination of nitrate in fertilizers.
New iodide-, thiocyanate-and perchlorate-selective liquid membrane electrodes based on the tris (... more New iodide-, thiocyanate-and perchlorate-selective liquid membrane electrodes based on the tris (2,2′,2′′salicylidene-imino)triethylamine-iron (III) complex has been reported. These electrodes exhibit linear Nernstian responses over the range 1.0 ×10 −1 -1.0 × 10 −5 M for thiocyanate and perchlorate and 1.0 × 10 −1 -1.0 × 10 −4 M for iodine, with slopes of 51.8 ± 1.4 mV per p[SCN], 55.9 ± 1.0 mV per p[ClO 4 ] and 55.2 ± 3.6 mV per p [I]. The effects of the pH and the liquid membrane composition were also investigated. The proposed electrodes have a fast response time and nearly micro molar detection limits. The lifetimes of the electrodes are at least one month. The potentiometric selectivity coefficients for some monovalent ions were evaluated by the mixed interference method. Applications of iodide and thiocyanate electrodes to potentiometric titration of these ions with silver nitrate are made.
Mineral Processing and Extractive Metallurgy Review, 2010
In this study, application of the Response Surface Methodology and the Central Composite Design (... more In this study, application of the Response Surface Methodology and the Central Composite Design (CCD) technique for modeling and optimization the influence of some operating variables on gold and silver recovery in a cyanidation process were investigated. Three ...
... a Mining Engineering Department, Cumhuriyet University, 58140 Sivas, Turkey. ... cyclone [8].... more ... a Mining Engineering Department, Cumhuriyet University, 58140 Sivas, Turkey. ... cyclone [8]. The BoxBehnken experimental design method has been employed for modeling and optimization of a multi-gravity separator to produce a celestite concentrate by Aslan [9]. Response ...
A three-level Box-Behnken factorial design combining with a response surface methodology (RSM) wa... more A three-level Box-Behnken factorial design combining with a response surface methodology (RSM) was employed for modeling and optimizing three operations parameters of the flotation on lead flotation. The flotation studies of lead ores containing 7.1% Pb were carried out in this study. The variables studied were potassium amyl xanthate (KAX) as a collector, sodium sulfide (Na 2 S) and pH. Experiments were carried out using Box-Behnken factorial design. The main and interaction effects were evaluated using response surface methodology. Second order response functions were produced for both the Pb grade and recovery. These response functions were then optimized using the quadratic programming method to maximize Pb grade and recovery within the experimental range studied. The optimum composition was found to be 212 g/t KAX, 1250 g/t sodium sulfide and 9 pH to achieve the maximum Pb grade. The model prediction of 47.44% Pb at optimum conditions was higher than any value obtained in the initial experiments conducted. In the same way, the optimum composition was found to be 100 g/t KAX, 1250 g/t Na 2 S and 7 pH to achieve the maximum recovery. The model prediction of 84.58% recovery at optimum conditions was also higher than any value obtained in the initial experiments conducted.
In this study, a three-level Box-Behnken factorial design combined with response surface methodol... more In this study, a three-level Box-Behnken factorial design combined with response surface methodology (RSM) for modeling and optimizing of some operations parameter of Multi-Gravity Separator (MGS) to produce a celestite concentrate was developed. The three significant operational parameters of MGS, which are drum speed, tilt angle and shake amplitude, were varied and the results evaluated with the Box-Behnken factorial design. Second-order response functions were produced for the celestite grade and recovery of the concentrate. Taking advantage of the quadratic programming, a drum speed of 150 rpm, tilt angle of 6°and shake amplitude of 20 mm have been determined as optimum levels to achieve the maximum SrSO 4 concentrate grade of 96.91%, whereas the maximum level of grade was 95.69% in the tests conducted or predicted. In the same way, a drum speed of 250 rpm, tilt angle of 2°and shake amplitude of 10 mm has been determined as optimum levels to achieve the maximum recovery of 98.35%, whereas it was 95.83% in the tests conducted or predicted.
Transactions of Nonferrous Metals Society of China, 2013
ABSTRACT The application of the response surface methodology and the central composite design (CC... more ABSTRACT The application of the response surface methodology and the central composite design (CCD) technique for modeling and optimization of the influence of some operating variables on copper, molybdenum and rhenium recoveries in a bioleaching process was investigated. Three main bioleaching parameters, namely pH, solid concentration and inoculum percent, were changed during the bioleaching tests based on CCD. The ranges of the bioleaching process variables used in the design were as follows: pH 1.46–2.14, solid concentration 0.95%–11.05%, and inoculum percent 1.59%–18.41%. A total of 20 bioleaching tests were carried out by the CCD method according to software-based designed matrix. Empirical model equations were developed according to the copper, molybdenum and rhenium recoveries obtained with these three parameters. Model equations of responses at the base of parameters were achieved by using statistical software. The model equations were then individually optimized by using quadratic programming to maximize copper, molybdenum and rhenium recoveries individually within the experimental range. The optimum conditions for copper recovery were pH 1.68, solid concentration 0.95% and the inoculum 18.41% (v/v), while molybdenum and rhenium recoveries were 2.18% and 24.41%, respectively. The predicted values for copper, molybdenum and rhenium recoveries were found to be in good agreement with the experimental values. Also jarosite formation during bioleaching tests was also investigated.
The aim of our research was to apply Box-Behnken experimental design and response surface methodo... more The aim of our research was to apply Box-Behnken experimental design and response surface methodology for modeling of some Turkish coals. As a base for this study, standard Bond grindability tests were initially done and Bond work indexes (W i ) values were calculated for three Turkish coals. The Box-Behnken experimental design was used to provide data for modeling and the variables of model were Bond work index, grinding time and ball diameter of mill. Coal grinding tests were performed changing these three variables for three size fractions of coals (À3350 + 1700 lm, À1700 + 710 lm and À710 lm).
In this study, the optimization of some parameters on agglomeration performance of Zonguldak bitu... more In this study, the optimization of some parameters on agglomeration performance of Zonguldak bituminous coal by oil agglomeration was discussed. A three-level Box–Behnken design combining with a response surface methodology (RSM) and quadratic programming (QP) were employed for modeling and optimization some operations parameters on oil agglomeration performance. The relationship between the responses, i.e., grade and recovery, and four process
In this paper, the multi-response optimization of grade and recovery simultaneously using Taguchi... more In this paper, the multi-response optimization of grade and recovery simultaneously using Taguchi quality loss function has been done for Zonguldak/Turkey bituminous coal by oil agglomeration. The controllable factors selected in this investigation are solid content, amount of oil, agitation time and agitation rate. The percentage contribution of each controllable factor has been determined on the performance of oil agglomeration.
A new nitrate-selective liquid-membrane electrode based on the tris(2,2',2"-sali... more A new nitrate-selective liquid-membrane electrode based on the tris(2,2',2"-salicylideneimino)triethylamine-iron(III) complex has been developed. This electrode exhibits a linear Nernstian response over the range 10(-1)-10(-4) M of nitrate, with a slope of 54.3 +/- 0.9 mV per p[NO3]. The effects of the pH and the liquid-membrane composition were also investigated. The lifetime of the electrode is at least one month. The selectivity coefficients for ten monovalent ions were calculated. The preparation procedure of the electrode is very easy and inexpensive. Moreover, the proposed electrode was applied for the determination of nitrate in fertilizers.
New iodide-, thiocyanate-and perchlorate-selective liquid membrane electrodes based on the tris (... more New iodide-, thiocyanate-and perchlorate-selective liquid membrane electrodes based on the tris (2,2′,2′′salicylidene-imino)triethylamine-iron (III) complex has been reported. These electrodes exhibit linear Nernstian responses over the range 1.0 ×10 −1 -1.0 × 10 −5 M for thiocyanate and perchlorate and 1.0 × 10 −1 -1.0 × 10 −4 M for iodine, with slopes of 51.8 ± 1.4 mV per p[SCN], 55.9 ± 1.0 mV per p[ClO 4 ] and 55.2 ± 3.6 mV per p [I]. The effects of the pH and the liquid membrane composition were also investigated. The proposed electrodes have a fast response time and nearly micro molar detection limits. The lifetimes of the electrodes are at least one month. The potentiometric selectivity coefficients for some monovalent ions were evaluated by the mixed interference method. Applications of iodide and thiocyanate electrodes to potentiometric titration of these ions with silver nitrate are made.
Mineral Processing and Extractive Metallurgy Review, 2010
In this study, application of the Response Surface Methodology and the Central Composite Design (... more In this study, application of the Response Surface Methodology and the Central Composite Design (CCD) technique for modeling and optimization the influence of some operating variables on gold and silver recovery in a cyanidation process were investigated. Three ...
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