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Li K.,Kunming University of Science and Technology | Xu R.-D.,Kunming University of Science and Technology | He S.-W.,Kunming University of Science and Technology | Chen H.-S.,Kunming University of Science and Technology | And 3 more authors.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2015

The arsenic and antimony were removed from bismuth-rich lead anode slime by alkaline pressure oxidation leaching. The effects of factors including oxidant dosage, NaOH concentration, ratio of liquid to solid, leaching temperature and leaching time on the arsenic and antimony removal were investigated, and the optimal process conditions were determined by experiments. The results show that the leaching rate of arsenic and antimony can reach over 95% and 80%, respectively. The removal of antimony can be realized by adding hydrogen peroxide after the removal of crystal sodium arsenate and lead antimonate by cooling and filtration. The alkaline leaching solution is returned to the leaching process after adding quantitative sodium hydroxide, which achieves the recycling of alkaline solution and the effective separation of arsenic and antimony from other metals. ©, 2015, Central South University of Technology. All right reserved.

Xie R.-F.,Kunming Medical University | Hu Q.-F.,Yunnan University | Yang G.-Y.,Yunnan University | Chen J.,Yunnan University | And 3 more authors.
Rare Metals | Year: 2016

The solid-phase extraction (SPE) technique applied to the extraction of organic compound was creatively used as the extraction of inorganic gold in the paper. Two types of techniques were proposed and explored, namely the SPE and the liquid–liquid extraction (LLE) of the quaternary ammonium surfactant [cetytrimethyl ammonium bromide (CTMAB), cetyl pyridine bromide (CPB), benzyl dimethyl dodecyl ammonium chloride (BDMDAC), and dodecyl trimethyl ammonium chloride (DTMAC)]. The surfactant could react with Au(CN)2 − to form the ionic complex, and the compound could be extracted by SPE column of reversed-phase bonded silica gel. Hence, a new method of SPE was proposed to extract gold with these features of the high selectivity, the reliability, and the simplicity. The experimental result shows that the recovery rate of gold is more than 98 %, and the solid-phase extraction column is not easily damaged and it can be repeatedly used. The new method can be used as the extraction process of gold from alkaline cyanide solution as well. Besides, the paper also puts forward a new process of gold extraction. © 2014, The Author(s).

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