有色金属科学与工程Issue(5)：82-86,5.DOI:10.13264/j.cnki.ysjskx.2014.05.015
CuO-CO2-NH3-H2O体系孔雀石浸出的热力学分析
Thermodynamic analysis of leaching malachite in CuO-CO 2-NH3-H2O system
摘要
Abstract
In or der to investigate issues of leaching malachite with ammoniacal solution, thermodynamic equilibriums of CuO-CO2-NH3-H2O system is studied, obtaining a series of equilibrium diagrams. The results show that OH-replaces gradually to form precipitate when pH is increased. The order of stable solids from low to high pH value is as follows: azurite, malachite and copper hydroxide. PH plays a decisive role in copper leaching. At low pH, H+competes with Cu2+to combine with NH3, which leads to a low concentration of copper-ammonia complex in solution;at high pH, OH-competes with NH3 to combine with Cu2+, which makes copper in solution convert to copper hydroxide precipitate. When the pH value is between 8 and 11, the competitive effects of H+and OH-are relatively weak. Most ammonia form complex with copper, and is the predominant species. Besides, the calculated theoretical optimal pH for leaching malachite is between 9.3 and 9.4. There is a roughly linear relationship between the total concentration of copper and nitrogen under this condition.关键词
孔雀石/氨浸出/pH值/热力学分析Key words
malachite/ammonia leaching/pH value/thermodynamic analysis分类
矿业与冶金引用本文复制引用
曹才放,王旭,赵天瑜,杨亮,熊辉辉..CuO-CO2-NH3-H2O体系孔雀石浸出的热力学分析[J].有色金属科学与工程,2014,(5):82-86,5.基金项目
江西省教育厅青年科学基金项目(GJJ14453) （GJJ14453）
江西理工大学博士科研启动基金项目(3401222025) （3401222025）
