(1. 中南大學(xué) 冶金與環(huán)境學(xué)院，長(zhǎng)沙 410083； 2. 河南豫光金鉛集團(tuán)有限責(zé)任公司，濟(jì)源 459000)
摘 要: 針對(duì)高砷銻金礦利用難度大的問(wèn)題，提出高砷銻金礦在堿性硫化鈉體系選擇性浸出銻的方案，考查各因素對(duì)銻浸出率的影響并確定了最優(yōu)浸出條件，同時(shí)，查明了最優(yōu)浸出條件下金和砷的浸出率。結(jié)果表明：硫化鈉過(guò)量系數(shù)、氫氧化鈉濃度和溫度的升高均有利于提高銻的浸出率，過(guò)度延長(zhǎng)反應(yīng)時(shí)間會(huì)使部分溶解的銻氧化沉淀，提高攪拌速度可以強(qiáng)化硫化鈉與高砷銻礦物之間的擴(kuò)散過(guò)程，增大洗水比可以實(shí)現(xiàn)銻的完全脫除。在最優(yōu)條件下，銻的浸出率達(dá)到99.0%以上，金和砷的浸出率分別為1.50%和0.06%，表明浸出過(guò)程中金和砷的溶解損失較小；浸出液靜置后析出的沉淀物分子式為NaSbO。
關(guān)鍵字: 銻金礦；浸出；銻；砷；硫化鈉
（1. School of Metallurgy and Environment, Central South University, Changsha 410083, China; 2. Henan Yuguang Gold and Lead Group Co., Ltd., Jiyuan 459000, China）
Abstract:Aiming at solving the problem of difficult utilization, a novel method for selective leaching of antimony from high-arsenic antimony-gold concentrate in alkaline sulfide solution was proposed. The effect of various factors on the leaching rates of antimony was investigated, and these leaching rates of gold and arsenic were also studied at the optimum conditions. The results show that the Na2S excess coefficients, NaOH concentration and temperature increase are beneficial to promote the leaching rate of antimony. Antimony content in the leaching residue can be decreased with increasing the temperature. Antimony dissolved in the leaching solution will be oxidized and precipitated in the residue with excessive prolonging time. Increasing stirring speed can improve the diffusion between sodium sulfide and concentrate. Antimony will be removed completely by increasing washing water ratio. Under the optimum conditions, the leaching rate of antimony reaches more than 99.0%, and the leaching rates of gold and arsenic are 1.50% and 0.06%, respectively. It indicates that antimony can be removed efficiently from antimony-gold concentrate, meanwhile, the dissolved losses of gold and arsenic are negligible. A black deposit of NaSbO can be precipitated from leaching solution.
Key words: antimony-gold concentrate; leaching; antimony; arsenic; sodium sulfide
