(中南大學(xué) 冶金與環(huán)境學(xué)院，長沙 410083)
摘 要: 針對選擇性沉淀法從鎢酸鹽溶液中除鉬過程，根據(jù)已有的熱力學(xué)數(shù)據(jù)，計(jì)算了伴生雜質(zhì)銻的硫化平衡行為，并探討和驗(yàn)證了深度除銻的可行性和途徑。繪制溶液中各含銻離子隨pH、溶液電勢以及硫與銻的濃度比[S]/[Sb]變化的分布曲線，分析了溶液中pH、硫化劑用量以及溶液電勢對銻硫化行為的影響規(guī)律，分析了選擇性沉淀法的除銻能力及其影響因素，提出了深度分離銻雜質(zhì)的方法，并通過實(shí)驗(yàn)對上述思路進(jìn)行了驗(yàn)證。結(jié)果表明：當(dāng)pH為7~10、[S]/[Sb]≥2時(shí)，溶液中99%以上含銻離子以SbS2-的形式存在；實(shí)驗(yàn)結(jié)果與理論預(yù)測一致，并取得了較好的效果，當(dāng)硫用量和銅加入量為銻摩爾量的3倍時(shí)，除銻率達(dá)到了97%。
關(guān)鍵字: 硫代銻酸鹽；除銻；硫化反應(yīng)；熱力學(xué)；選擇性沉淀法；鎢酸鹽溶液
（School of Metallurgy and Environment, Central South University, Changsha 410083, China）
Abstract:Aiming at the behavior of impurity Sb in the process of Mo separation by selective precipitation method, the distribution of diagram of various antimony-containing ions were drawn according to thermodynamic calculation results. And the sulfurization of Sb under conditions of different pH, φh and [Sb]/[S] was discussed and verified. The effectiveness of selective precipitation and operating factors on antimony removing were analyzed considering the competitive coordination of S2- ions, and a method was proposed for deep removing antimony impurities. The result show that, under the conditions of pH 7-10 and [S]/[Sb]≥2, more than 99% of antimony exists as SbS2-. The above idea is verified by experiment and the results are consistent with theoretical predictions. When the dosage of sulfur and copper are 3 times, the removal rate of antimony is 97%.
Key words: sulfantimoniate; antimony removal; sulfidation reaction; thermodynamics; selective precipitation; tungstatesdution
