(2江西理工大學(xué) 江西省礦業(yè)工程重點實驗室 資源與環(huán)境工程學(xué)院，贛州 341000)
摘 要: 以鐵閃鋅礦單礦物、黃銅礦單礦物、氰化鐵閃鋅礦和氰化黃銅礦為研究對象，研究焦亞硫酸鈉活化氰化硫化銅鋅礦的活化浮選動力學(xué)。結(jié)果表明：在丁基黃藥5.32×10-5 mol/L、2號油10 mg/L、硫酸銅8.01×10-5 mol/L、pH 9.8~10.2、焦亞硫酸鈉添加量1.67×10-5 mol/L的條件下，鋅回收率達到86%以上；在丁基黃藥5.32×10-5 mol/L、2號油10 mg/L、pH 9.8~10.2，焦亞硫酸鈉添加量1.33×10-5 mol/L的條件下，銅回收率達到95%以上；與氰化鐵閃鋅礦相比，焦亞硫酸鈉活化氰化黃銅礦的速率常數(shù)相對較高。在此基礎(chǔ)上，通過紅外光譜和Zeta電位對活化機理進行分析，表明在溶液中焦亞硫酸鈉水解生成的 能夠?qū)N-氧化為CNO-，破壞 和 中的Zn—C和Cu—C鍵，阻礙CN-在礦物表面的吸附；同時 也可以將S2-氧化為單質(zhì)硫，形成疏水性礦物表面。在活化過程中，由于CN-的還原性強于S2-的，焦亞硫酸鈉優(yōu)先與CN-發(fā)生反應(yīng)。
關(guān)鍵字: 焦亞硫酸鈉；硫化銅鋅礦；氰根；活化機理；動力學(xué)
（Jiangxi Key Laboratory of Mining Engineering, Faculty of Resource and Environmental Engineering,
Jiangxi University of Science and Technology, Ganzhou 341000, China）
Abstract:The activation of depressed marmatite and chalcopyrite were investigated using sodium metabisulfite as activator. The results indicate that the zinc recovery rate exceeds 86% under the conditions of xanthate concentration of 5.32×10-5 mol/L, 2# oil 10 mg/L, copper sulfate concentration 8.01×10-5 mol/L, pH of 9.8-10.2 and sodium metabisulfite concentration of 1.67×10-3 mol/L. The copper recovery rate exceeds 95% under the conditions of xanthate concentration of 5.32×10-5 mol/L, 2# oil of 10 mg/L, pH of 9.8-10.2 and sodium metabisulfite concentration of 1.33×10-3 mol/L. Moreover, the activation-flotation rate constant of chalcopyrite is bigger than that of marmatite. Based on above studies, IR and Zeta potential were used to analyze the activation mechanism. The results show that the ion , which sodium metabisulfite can give in aqueous solutions, can promote the oxidation of cyanide to cyanate, and therefore destroy Zn—C bond and Cu—C bond, which inhibites the adsorption of cyanide. Moreover, the ion can oxidize divalent sulfur ion into elemental sulfur, causing the mineral surfaces hydrophobic. Due to stronger reducibility of cyanide than that of divalent sulfur ion, sodium metabisulfite can firstly destroy cyanide and then attack the sulphides.
Key words: sodium metabisulfite; copper zinc sulfide ore; cyanide; activation mechanism; kinetics
