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Effect of PbO on cyanidation leaching behavior of bornite
Powder Technology ( IF 4.5 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.powtec.2020.04.006
Wei Yang , Kai Zhang , Yaping Wang , Tao Long , He Wan , Hui Li , Qian Wang

Abstract During the cyanidation of gold‑copper ores or concentrates, the presence of cyanide-soluble copper significantly increases the cyanide consumption. However, the consumption of cyanide and dissolved oxygen, the concentration of sulfide ions in the leaching solution decreased with the increase of PbO amount. The SEM-EDS analyzed that there was no obvious corrosion on the surface of the bornite leaching residue in the presence of 1.5 g/L PbO, but the surface was getting very sleek. It was known from thermodynamic calculation that PbO would partially dissolve to form plumbite ions in the alkaline cyanide solution, and plumbite ions would react with sulfide ions to form PbS precipitate. The XPS analysis also proved that a large amount of undissolved PbO and PbS precipitation were adsorbed on the surface of bornite. The adhesion of PbO and PbS on the surface of bornite inhibited dissolution of bornite in the cyanide solution.

中文翻译:

PbO对斑铜矿氰化浸出行为的影响

摘要 在金铜矿石或精矿氰化过程中,氰化物可溶性铜的存在显着增加了氰化物的消耗。但氰化物和溶解氧的消耗,浸出液中硫化物离子的浓度随着PbO用量的增加而降低。SEM-EDS分析,在1.5 g/L PbO存在下,斑铜矿浸出渣表面无明显腐蚀,但表​​面变得非常光滑。由热力学计算可知,PbO在碱性氰化物溶液中会部分溶解形成铅酸离子,铅酸离子会与硫化物离子反应形成PbS沉淀。XPS分析还证明,大量未溶解的PbO和PbS沉淀吸附在斑铜矿表面。
更新日期:2020-05-01
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