(1. 湘潭工学院化工冶金研究所，湘潭 411201; 2. 北京有色金属研究总院，北京 100080)
摘 要: 采用DX低碱度抑制剂, 用NaOH调节pH，在pH=9～10 的范围内浮铜抑硫，使混合精矿中的有价金属与黄铁矿分离，再选精矿产率20%～30%，尾矿含金低于3.0 g/t。在较低的压力下(氧压0.4～0.6 MPa) 对所得精矿进行氧压氨浸，使硫转化为硫酸铵, 铜进入溶液，金银留在浸渣中。分选中金、银、铜回收率分别为95%，90%和85%；分选条件为pH=9.5，捕收剂用量200 g/t，DX抑制剂3 kg/t。低压氨浸铜浸出率为95%，浸出压力0.5 MPa，温度120 ℃，时间3 h，氨浓度45 g/L。氰化浸出金、银浸出率为97%和95%，置换率99%和98%。金、银、铜总回收率分别为94％，84％和81％。
关键字: 浮选精矿； 铜硫分离； 压力浸出
（1. Institute of Chemical Metallurgy, Xiangtan Polytechnic University, Xiangtan 411201, P. R. China
2. General Research Institute for Nonferrous Metals, Beijing 100088, P. R. China）
Abstract: A weak alkaline processing technique was used to treat the flotation concentrate to separate Cu, Ag, Au from pyrite, by using sodium hydroxide as pH adjusting reagent and DX as depressant. The recovery of product was 20%～30 % and the gold content in the tailings was below 3.0 g/t. As a result, lots of useless minerals were discarded, the grade of useful minerals was increased and the later metallurgical volume was restricted. Then under lower leaching pressure(0.4～0.6 MPa), the product was leached by ammonia to extract copper, the chemical byproduct is (NH4)2SO4 and Au/Ag residue. So many problems such as elemental sulfur and higher demands of equipment confronted frequently in the traditional process were avoided. The leaching residue was cyanided to recover gold and silver in the presence of rich oxygen. The separation recovery of gold, silver and copper were 95% , 90% and 85% respectively, under the condition of pH=9.5, DX consumption 3 kg/t and collector dosage 200 g/t. The recovery of copper in ammonia leaching was 95%, under the condition of oxygen pressure 0. 5 MPa, temperature 120 ℃, leaching time 3 h and NH3 45 g/L. The total recovery index for Au, Ag, Cu were 94%, 84% and 81%, respectively.
Key words: flotation concentrates; separation of copper an d sulphur; pressure leaching
