(1. 湘潭工學(xué)院化工冶金研究所，湘潭 411201; 2. 北京有色金屬研究總院，北京 100080)
摘 要: 采用DX低堿度抑制劑, 用NaOH調(diào)節(jié)pH，在pH=9～10 的范圍內(nèi)浮銅抑硫，使混合精礦中的有價金屬與黃鐵礦分離，再選精礦產(chǎn)率20%～30%，尾礦含金低于3.0 g/t。在較低的壓力下(氧壓0.4～0.6 MPa) 對所得精礦進(jìn)行氧壓氨浸，使硫轉(zhuǎn)化為硫酸銨, 銅進(jìn)入溶液，金銀留在浸渣中。分選中金、銀、銅回收率分別為95%，90%和85%；分選條件為pH=9.5，捕收劑用量200 g/t，DX抑制劑3 kg/t。低壓氨浸銅浸出率為95%，浸出壓力0.5 MPa，溫度120 ℃，時間3 h，氨濃度45 g/L。氰化浸出金、銀浸出率為97%和95%，置換率99%和98%。金、銀、銅總回收率分別為94％，84％和81％。
關(guān)鍵字: 浮選精礦； 銅硫分離； 壓力浸出
（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
