Development of a gold leaching reagent as an alternative to cyanide: Synthesis and performance evaluation  

作　　者：Jinlin Li Chunbao Sun Jue Kou Peilong Wang Xinyu Liu 

机构地区：[1]School of Resources and Safety Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]Key Laboratory of the Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2025年第4期835-850,共16页矿物冶金与材料学报(英文版)

基　　金：financially supported by the National Natural Science Foundation of China (No.51974016)。

摘　　要：Cyanide is the most widely used reagent in gold production processes. However, cyanide is highly toxic and poses safety haz-ards during transportation and use. Therefore, it is necessary to develop gold leaching reagents that can replace cyanide. This paper intro-duces a method for synthesizing a gold leaching reagent. Sodium cyanate is used as the main raw material, with sodium hydroxide and so-dium ferrocyanide used as additives. The gold leaching reagent can be obtained under the conditions of a mass ratio of sodium cyanate,sodium hydroxide, and sodium ferrocyanide of 15:3:1, synthesis temperature of 600℃, and synthesis time of 1 h. This reagent has a goodrecovery effect on gold concentrate and gold-containing electronic waste. The gold leaching rate of roasted desulfurized gold concentratecan reach 87.56%. For the extraction experiments of three types of gold-containing electronic waste, the gold leaching rate can reach over90% after 2 h. Furthermore, the reagent exhibits good selectivity towards gold. Component analysis indicates that the effective compon-ent in the reagent could be sodium isocyanate.

关 键 词：gold leaching reagent sodium isocyanate electronic waste gold leaching rate SELECTIVITY 

分 类 号：O62[理学—有机化学]