硫化铜精矿的硫酸铵焙烧浸出

Leaching of Copper Sulfide Concentrates by Ammonium Sulfate Roasting

将硫化铜精矿与硫酸铵混合进行硫酸化焙烧,不仅有利于铜的浸出,而且硫酸铵分解出的氨用于提铜废酸液的中和处理,可以实现硫酸铵的循环利用。结果表明,在硫酸铵用量为1.5n(n为硫酸铵与黄铜矿的摩尔比)、420℃焙烧180min的条件下,铜硫酸盐化的效果最好,硫酸铵基本上完全分解,产生的氨97%左右可用稀硫酸液吸收。烧渣按液固比为4在80℃浸出90 min时,铜的浸出率可达89.96%。

Sulfation roasting of copper sulfide concentrates mixed with ammonium sulfate can not only promote leaching of copper,but also realize cyclic utilization of ammonium sulfate by neutralization treatment of waste acid solution from extraction process of copper with decomposed ammonia.The results show that the best copper sulfation effect is realized under conditions including ammonium sulfate dosage of1.5n（molar ratio of ammonium sulfate and chalcopyrite）,roasting temperature of 420 ℃,and roasting duration of 180 min.Ammonium sulfate is almost completely decomposed and about 97% ammonia produced can be absorbed with dilute sulfuric acid liquor.Copper leaching rate of calcined cinder is 89.96%after leached at 80 ℃for 90 min with ratio of liquid to solid of 4.