(1. 中南大學(xué) 冶金與環(huán)境學(xué)院，長沙 410083；
2. 株洲冶煉集團(tuán)有限公司，株洲 412000)
摘 要: 采用空氣做氧化劑，在堿性體系中將砷、鋅高效浸出。結(jié)果表明：在溫度為80 ℃、堿濃度為5 mol/L、時間為12 h、液固比為5:1的條件下，砷、鋅的浸出率均能夠達(dá)到99%以上，2%的鈷、銅被浸出，鎳基本不被浸出；空氣氧化浸出含砷鈷鎳渣的平均表觀活化能為11.62 kJ/mol，屬于擴(kuò)散控制；平均反應(yīng)級數(shù)為0.69；浸出渣中含銅68.24%、鈷3.04%、鎳0.87%，且含砷僅有0.01%，可進(jìn)行銅、鈷、鎳的進(jìn)一步回收。采用空氣堿浸含砷鎳鈷渣，技術(shù)操作簡單、成本低廉，避免劇毒砷化氫氣體的產(chǎn)生，對含砷資源的綜合利用有一定的現(xiàn)實意義。
關(guān)鍵字: 空氣堿浸；砷；動力學(xué)；含砷鈷鎳渣
（1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. Zhuzhou Smelter Group Company Limited, Zhuzhou 412000, China）
Abstract:Arsenic and zinc are efficiently leached in an alkaline system using air as an oxidant. The results show that the appropriate leaching conditions are listed as the follows: The alkali concentration is 5mol/L, reaction temperature is 80 ℃, reaction time is 12 h, liquid to solid ratio is 5:1. Under the above conditions, the leaching rate of arsenic and zinc in the residue can reach more than 99% and that of cobalt and copper is below 2%. Nickel is not substantially leached. Its apparent activation energy is 11.62 kJ/mol. It can be seen that the oxidation of arsenic leaching is mainly controlled by diffusion. The average reaction order is 0.69. The leaching residue contains 68.24% Cu, 3.04%Co, 0.87% Ni, and only 0.01% of arsenic. It is conducive to the further recovery of copper, cobalt and nickel. The alkali leaching has simple technical operation and low cost. The technology avoids the generation of highly toxic AsH3 and has practical significance for the comprehensive utilization of arsenic resources.
Key words: alkaline leaching; arsenic; kinetic study; cobalt/nickel residue containing arsenic
