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Cu 2+ -catalyzed mechanism in oxygen-pressure acid leaching of artificial sphalerite
International Journal of Minerals, Metallurgy and Materials ( IF 4.8 ) Pub Date : 2020-07-13 , DOI: 10.1007/s12613-019-1918-2
Lei Tian , Ao Gong , Xuan-gao Wu , Yan Liu , Zhi-feng Xu , Ting-an Zhang

The potential autoclave was used to study the catalytic mechanism of Cu2+ during the oxygen pressure leaching process of artificial sphalerite. By studying the potential change of the system at different temperatures and the SEM-EDS difference of the leaching residues, it was found that in the temperature range of 363–423 K, the internal Cu2+ formed a CuS deposit on the surface of sphalerite, which hindered the leaching reaction, resulting in a zinc leaching rate of only 51.04%. When the temperature exceeds 463 K, the system potential increases steadily. The increase in temperature leads to the dissolution of the CuS, which is beneficial to the circulation catalysis of Cu2+. At this time, the leaching rate of Zn exceeds 95%. In addition, the leaching kinetics equations at 363–423 and 423–483 K were established. The activation energy of zinc leaching at 363–423 and 423–483 K is 38.66 and 36.25 kJ/mol, respectively, and the leaching process is controlled by surface chemical reactions.



中文翻译:

人工闪锌矿氧压酸浸中Cu 2+催化机理

利用电位高压釜研究了人工闪锌矿氧压浸出过程中Cu 2+的催化机理。通过研究系统在不同温度下的电势变化以及浸出残留物的SEM-EDS差异,发现在363–423 K的温度范围内,内部Cu 2+在闪锌矿表面上形成了CuS沉积物,这阻碍了浸出反应,导致锌的浸出率仅为51.04%。当温度超过463 K时,系统电势稳定增加。温度升高导致CuS溶解,有利于Cu 2+的循环催化。此时,Zn的浸出率超过95%。另外,建立了363-423和423-483 K的浸出动力学方程。锌在363–423和423–483 K处浸出的活化能分别为38.66和36.25 kJ / mol,浸出过程受表面化学反应控制。

更新日期:2020-07-13
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