【摘要】 全面介绍了我国的2个金三角黄金资源的基本情况,针对2个金三角所产的难冶金矿中砷化合物一般为雄黄和雌黄的特点,详细分析了雄黄和雌黄在氨水中的转化及溶解的机理,从理论上验证了氨法脱砷的可行性。在氨法脱砷过程中,由于溶解于氨水中的雌黄可能会在矿石微粒上吸附,从而形成一层钝化层影响到后续金的氰化过程。因此,必须对脱砷后的金矿进行活化以去除表面钝化膜。Cu2+的加入不仅有利于雌黄钝化膜的脱除,还能显著地提高预处理后金矿中金的浸出率。运用该方法,研究者们对于甘肃坪定金矿、贵州丹寨和东北寨金矿所产难处理金矿进行了氨法脱砷—催化氧化活化—氰化提金扩大实验研究,实验结果表明金的浸出率都在85%以上,与小试所得结果一致。更多还原

【Abstract】 A comprehensive introduction to the basic characteristics of the tew golden triangles of gold resources was given in this paper.The golden ores from the two golden triangles of gold resources are consisted of orpiment and realgar.Detailed analysis of the mechanism of realgar transformation and orpiment dissolution in ammonia solution was carried out.It confirms the feasibility of the ammonia arsenic removal in theoretically.Owing to adsorption of orpiment on the surface of ore particle and formation of a passivation layer which affected subsequent gold-cyanide process in the process of ammonia arsenic removal,it’s necessary to activate the dearsenication gold mine to remove passivation films on their surfaces.The addition of Cu2+ ion not only impels the removal of orpiment passivation film but also inproves the leaching ration of gold.Amplified experiment of refractory gold ores from Pingding,Gansu province,Danzai and Dongbeizai,Guizhou province were carried out by using such ammonia arsenic removal-catalytic oxidation-cyanide process.The results of experiment confirmed that the leaching ratio of refractory gold mineral could reach to 85%.更多还原