Henan Zhongyuan Gold Smelter Co.

Sanmenxia, China

Henan Zhongyuan Gold Smelter Co.

Sanmenxia, China
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Zhang F.-Y.,Central South University | Zhang F.-Y.,Henan Zhongyuan Gold Smelter Co. | Zhang F.-Y.,Key Laboratory of Comprehensive Utilization of Gold Resource | Zheng Y.-J.,Central South University | And 2 more authors.
International Journal of Minerals, Metallurgy and Materials | Year: 2017

A new technique of swelling oxidizing roasting and alkaline leaching was proposed for deselenization and detellurization of precious-metal ore concentrates. Alkali-metal and alkaline-earth-metal chlorides and carbonates were preliminarily selected as swelling agents. The roasting removal rate and alkaline leaching rate of selenium and tellurium were investigated, and NaCl was selected as an appropriate swelling agent. Furthermore, the effects of various factors on the selenium gasification rate and leaching rate of selenium and tellurium were investigated. The results show that the selenium gasification rate reaches 88.41% after swelling oxidizing roasting for 2 h at 510°C using an NaCl dosage coefficient of 100 and a sulfuric acid dosage coefficient of 1.3; the amorphous elemental tellurium is completely transformed into TiO2. The roasted product is subjected to alkaline leaching using a 100 g/L NaOH solution, which results in a selenium leaching rate of 10.51%, a total selenium removal rate of 98.92%, and a tellurium leaching rate of 97.64%. In the alkaline leaching residue, the contents of selenium, tellurium, gold, platinum, and palladium are 0.7825%, 5.492%, 8.333%, 0.2587%, and 1.113%, respectively; the precious metals are enriched approximately sixfold. © 2017, University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg.


Peng Y.-L.,Hunan City University | Ma Y.-Y.,Central South University | Zhang F.-Y.,Henan Zhongyuan Gold Smelter Co. | Zheng Y.-J.,Central South University
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2017

Platinum and palladium concentrate is obtained from precipitated gold solution reduced by hydrazine hydrate and hydroxylamine hydrochloride. The total content of selenium and tellurium reaches up to 71.15%, and that of gold, platinum and palladium reaches 3.65% in platinum and palladium concentrate. Therefore, the separation of selenium and tellurium from platinum and palladium concentrate is important for the enrichment and recovery of precious metals. Thermodynamic analysis shows that in an alkaline environment, using hydrogen peroxide as oxidant, Se and Te can be oxidized to soluble ionic compounds with a higher valence state, while Au, Pt and Pd stay in the solid phase stably. Oxidative alkaline leaching experimental results show that the suitable conditions for the separation of selenium and tellurium from platinum and palladium concentrate are as follows: the amount of hydrogen peroxide is 250 mL/L, NaOH concentration is 5 mol/L, leaching temperature is 85℃, liquid-solid ratio is 51:(mL/g) and reaction time is 2 h. Under the suitable conditions, the leaching rates of selenium and tellurium are 82.49% and 92.45%, respectively, while the gold, platinum and palladium are not leached out. The precious metals are enriched, and its total content is 23.18% in oxidative alkaline leaching residue, which is 6.35 times higher than that in the platinum and palladium concentrate. © 2017, Science Press. All right reserved.


ZHANG F.-Y.,Central South University | ZHANG F.-Y.,Henan Zhongyuan Gold Smelter Co. | ZHANG F.-Y.,Key Laboratory of Comprehensive Utilization of Gold Resource in Henan Province | ZHENG Y.-J.,Central South University | And 2 more authors.
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2017

This paper focused on investigating high-efficient reductants of recovering selenium and tellurium from degoldized solution of copper anode slimes. Firstly, the effect of various reductants on recovery rates of Se and Te was investigated based on thermodynamic analysis of various metallic ions in degoldized solution. Secondly, the single factor experiments were made to investigate the effect of the process parameters on recovering Se and Te with hydrazine hydrate. Finally, the hydroxylamine hydrochloride was added to intensify the extraction efficiencies of Se and Te. The results indicated that hydrazine hydrate was the most suitable reductant, and the recovery rates of Se and Te are 71.23% and 76.50%, respectively; the recovery rates of Se and Te were 92.07% and 97.81%, respectively, under the optimal process conditions of hydrazine hydrate dosage of 0.2133 mol/L, H+ concentration of 4.305 mol/L, reaction temperature of 85 °C and reaction time of 5 h; the recovery rate of Se was 97.59%, and that Te reached up to 100% when hydroxylamine hydrochloride dosage was 1.5116 mol/L. © 2017 The Nonferrous Metals Society of China


Zhang F.,Central South University | Zhang F.,Henan Zhongyuan Gold Smelter Co. | Xiong L.,Henan Zhongyuan Gold Smelter Co. | Zheng Y.,Central South University | Ma Y.,Central South University
Xiyou Jinshu/Chinese Journal of Rare Metals | Year: 2016

The oxidation roasting method with adding NaCl was proposed to recover selenium from the gold concentrate roasting acid mud. The grain size and chemical composition analysis were done on acid mud. The results showed that more than 70% selenium of acid mud existed in the form of simple substance. The particle size of less than 150 μm and less than 75 μm accounted for 62.39% and 47.04%, respectively. The particle size was small and its distribution was uniform. Oxidation roasting and efficient reduction method were processed by orthogonal experiment and single factor experiment analysis method. The optimum reaction parameters were as following: oxidant sulfuric acid added coefficient of 1.4, NaCl added coefficient of 12, roasting for 4 h at 510℃, under which selenium gasification rate could reach 99.03%.The roasted flue gas were absorbed by alkaline solution and treated by efficient reduction method. The grade of crude selenium reached 96.30% after reduction,and the recovery rate reached 98.09%. The crystalline phase and micro morphology of acid mud, roasted product and crude selenium were investigated by X-ray diffractometry (XRD) and scanning electron microscopy (SEM), respectively. The results showed that acid mud granules were complex structure with size inequality, the roasted product particles were relatively uniform, and the micro morphology of crude selenium presented uneven granular spherical particles with 1~5 μm in diameter size. © Editorial Office of Chinese Journal of Rare Metals. All right reserved.


Zhang F.-Y.,Central South University | Zhang F.-Y.,Henan Zhongyuan Gold Smelter Co. | Zheng Y.-J.,Central South University | Sun Z.-M.,Central South University | And 2 more authors.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2015

By using sodium sulfite as reductant and Cl- and composited halogen ions as catalysts, selenium and tellurium were recovered and gold, platinum and palladium were captured from precipitated gold solution that was leached by chlorination and reduction from copper anode slime. The crystalline phase and the morphology of reduction product were investigated by XRD and SEM, respectively. The results show that the reduction rates of selenium, gold, platinum and palladium are 100.0% and the reduction rate of tellurium is 97.7% when Cl- concentration is 1.1 mol/L,reaction temperature is 85 ℃,reaction time is 1 h, H2SO4 concentration is 368 g/L and Na2SO3 concentration is 100 g/L. The reaction speed is faster than that of NaCl catalyst when the molar ratio of NaCl to NaBr in the complex catalysts is 1:2. The mass fractions of tellurium, copper, selenium, gold, palladium, platinum in reduction product are 73.95%, 12.35%, 7.65%, 3.31%, 0.95%, 0.24%, respectively. Tellurium exists in the form of simple substance in the reduction product, the morphology of the product is columnar body. ©, 2015, Central South University of Technology. All right reserved.


Peng G.,Henan Zhongyuan Gold Smelter Co. | Peng G.,Henan Province Key Laboratory of Gold Resource Utilization | Zhang Y.,Henan Zhongyuan Gold Smelter Co. | Zhang Y.,Henan Province Key Laboratory of Gold Resource Utilization | And 4 more authors.
Xiyou Jinshu/Chinese Journal of Rare Metals | Year: 2015

According to the X-ray fluorescence (XRF), multi-element analysis and selenium phase analysis results, a hydrometallurgical treatment process was studied. The treatment process was determined by the effects of different treatment enhanced leaching agents. The influence of different factors on enhanced leaching was studied, and the effect of different reduction factors on the reducing rate was studied. The results showed that the optimal conditions were as follows: sulfuric acid of the enhanced leaching agent, liquid to solid weight ratio of 1.5:1.0, leaching time of 2.5 h and leaching temperature of 90℃. Under the optimal conditions, the selenium grade of leached residue was less than 0.5%, and leaching rate was 99.99%. The optimal reducing conditions were as follows: the temperature of 70℃, the chloride ion concentration of 0.06 mol·L-1, sodium sulfite amount of 1.2 times the theoretical amount. The selenium content in the solution was less than 0.03 mg·L-1, the selenium reduction rate was 99.99%, the selenium content in crude selenium was 93%, and the total recovery of selenium reached 96.7% under the optimum conditions. The recovery of Se from high-lead selenium materials was realized. And the selenium could be simply and efficiently treated by this process. © Editorial Office of Chinese Journal of Rare Metals. All right reserved.

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