Key Laboratory of Comprehensive Utilization of Gold Resource in Henan Province

Zhengzhou, China

Key Laboratory of Comprehensive Utilization of Gold Resource in Henan Province

Zhengzhou, 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 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 B.,Key Laboratory of Comprehensive Utilization of Gold Resource in Henan Province | Liu H.-Z.,Key Laboratory of Comprehensive Utilization of Gold Resource in Henan Province | Wang W.,Key Laboratory of Comprehensive Utilization of Gold Resource in Henan Province | Gao Z.-G.,Key Laboratory of Comprehensive Utilization of Gold Resource in Henan Province | Cao Y.-H.,Key Laboratory of Comprehensive Utilization of Gold Resource in Henan Province
Hydrometallurgy | Year: 2017

This paper investigated the efficient extraction of rhenium from the leach solution generated by roasting the copper concentrates in a copper smelting plant by direct ion exchange process using weak base resins. The adsorption behaviors of rhenium with other coexisting impurity ions belonged to kinetic control by particle diffusion process, and the reaction rate constant was calculated. Then, the influences of temperature, pH value, stirring rate and calcium oxide dosage on the equilibrium adsorption capacity of rhenium were studied by batch experiments. To verify the process of extracting rhenium in industrial application, three ion exchange columns packing with 105 L resins were operated to recover rhenium by direct ion exchange method. In the adsorption process, the recovery rate of rhenium reached 97.13% after approximately 960 BVs of leach solution flow. The loaded resins were eluated using 2.5% concentration of aqueous ammonia, producing a rhenium-rich solution containing 1995 mg/L rhenium, in which the rhenium concentration enriched 309 times compared to the original leach solution. © 2017 Elsevier B.V.


Gao Z.,Chinese Academy of Geological Sciences | Gao Z.,Key Laboratory of Evaluation and Multipurpose Utilization of Polymetallic Ore | Gao Z.,Key Laboratory of Comprehensive Utilization of Gold Resource in Henan Province | Zhang B.,Chinese Academy of Geological Sciences | And 11 more authors.
Green Processing and Synthesis | Year: 2015

In order to extract molybdenum (Mo) from alkali leaching solution of low-grade Mo concentrate, static and dynamic ion exchange experiments were performed. The static experiments results indicated that the adsorption capacity of D201 resins reached 93.50% at pH 3.5, while the adsorption capacity of D314 resins was 95.47%. Therefore, D314 resin was adopted for further experiments. The dynamic experiments results indicated that the adsorption capacity of Mo reached 96.77% when the flow rate of leaching solution was 1 ml/min. The loaded resin could be desorbed by 10% ammonia solution. In consequence, the maximum concentration of Mo in eluate was 122 g/l. In the precipitation process, the Mo recovery reached 97.81%, and the obtained Mo oxide products met the requirement of YMo 55 national standard in GB/T24482-2009 and Grade A standard of ASTM A146-04 (2014). © by De Gruyter 2015.

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