工程科学学报2016，Vol.38Issue(6)：760-766,7.DOI:10.13374/j.issn2095-9389.2016.06.003
含碳酸盐脉石氧化铜矿的酸浸动力学
Leaching kinetic of copper oxide ore containing carbonate gangue in the acid condition
摘要
Abstract
This article is focused on the leaching kinetic of copper oxide ore containing carbonate gangue. The effects of tempera-ture, acid concentration, particle size, liquid-to-solid ratio and stirring rate on leaching of the copper oxide ore were determined. The results show that high temperature, high acid concentration, high liquid-to-solid ratio, low particle size and high stirring rate benefit the copper leaching. However, the carbonate gangue leads to a high consumption of acid. In consideration of leaching cost, the proper leaching condition is the temperature of 303 K, acid concentration of 35 g·L-1 , particle size of 0. 074-0. 125 mm, liquid-to-solid ratio of 3﹕1, and stirring rate of 180 r·min-1 . After leaching for 180 min, the copper leaching rate reaches 53. 6%. The morphologies of the ore surface before and after leaching were investigated and the results reveal that the carbonate gangue dissolves in the acid solution and CaSO4·2H2 O precipitation forms on the ore surface, which limits the development of porosity and cracks. Based on the shrinking core model, the leaching kinetic was analyzed. It is found that the precipitation on the ore surface hinders the leaching reaction. The diffusion across the product layer is the rate-controlling step and the activation energy is determined to be 8. 65 kJ·mol-1 .关键词
铜矿处理/氧化铜/碳酸盐/表面形貌/沉淀/浸出动力学Key words
copper ore treatment/copper oxide/carbonates/surface morphology/precipitation/leaching kinetics分类
矿业与冶金引用本文复制引用
吴爱祥,胡凯建,王贻明,王少勇,徐恒..含碳酸盐脉石氧化铜矿的酸浸动力学[J].工程科学学报,2016,38(6):760-766,7.基金项目
“十二五”国家科技支撑计划资助项目(2012BAB08B02) （2012BAB08B02）
国家自然科学基金资助项目(51304011,51374035) （51304011,51374035）
