焙烧对高砷白烟灰中铜浸出率的影响及其热力学分析  

Effects on Copper Leaching Rate in High-arsenic Copper Smelting Ash by Roasting and Its Thermodynamics

作　　者：张晓峰[1] 曹佐英[1] 肖连生[1] 李立清[2] 王福源 张虎 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083 [2]中南大学能源与动力学院,湖南长沙410083 [3]河南济源市欣欣实业有限公司,河南济源454650

出　　处：《矿冶工程》2012年第5期86-89,共4页Mining and Metallurgical Engineering

摘　　要：将火法炼铜所得含砷高达22%的难溶性白烟灰进行氧化焙烧处理,然后用稀酸对铜进行浸出试验,考察了焙烧时间和焙烧温度对铜浸出率的影响,并对其热力学性质进行了分析。试验结果表明,用2 mol/L的H2SO4以4∶1的液固比对白烟灰直接浸出,铜的浸出率为45%;在焙烧温度500℃以上焙烧1 h,用1 mol/L的H2SO4在相同条件下浸出,可以使白烟灰中铜的浸出率达到98%,同时,可回收白烟灰中95%以上的三氧化二砷。对相关氧化反应的热力学数据进行分析计算表明,焙烧后铜的化合物变成了易浸出的氧化物或硫酸盐,因而浸出率提高。The insoluble smelting ash with 22% arsenic content, which was obtained from copper pyrometallurgy, was treated by oxidizing roasting followed by copper leaching process with dilute acid. The effects of roasting time and temperature on the copper leaching rate were investigated and its thermodynamics was then analyzed. The results showed that copper leaching rate reached 45% by directly leaching with 2 mol/L HzSO4 at a liquid-to-solid ratio of 4： 1. After roasted at a temperature of above 500 ℃ for 1 h, the copper leaching rate can be up to 98% at the same conditions. Meanwhile, more than 95% arsenic trioxide in the ash can be recovered. Thermodynamic analysis and calculations showed that the copper compound was changed to CuS4 and CuO liable to be leached, resulting in leaching rate increased.

关 键 词：炼铜白烟灰 铜浸出 氧化焙烧 热力学 

分 类 号：TF111[冶金工程—冶金物理化学]