Study on Leaching Technology of Acid and Impurity Control of Refractory Copper Oxide from Luanshya
Luanshya Muliashi copper oxide ore in Zambia has complex properties.It was originally treated by convention-al heating stirring leaching process,but the content of impurity ions in the leaching solution is high,which affects the subse-quent extraction-electrowinning operation.In order to realize the efficient and clean utilization of the ore,the experimental study on the acid and impurity control leaching by branch acid addition is carried out.The results show that under the conditions of grinding fineness of-200 mesh accounting for 70%,sulfuric acid dosage of 45 kg/t,pulp concentration of 40%,stirring inten-sity of 300 r/min and leaching temperature of 65 ℃,the conventional leaching test of ore is carried out.The leaching rate of copper is 80.35%,the leaching rate of iron is 8.81%,and the leaching rate of manganese is 39.38%.Under the conditions of sulfuric acid dosage of 37.5 kg/t,acid addition ratios of 30%,25%,20%,15%,10%and 0 in each stage,and leaching time of 40 min in each stage,the copper leaching rate of branch and acid addition leaching test is 83.29%,the iron leaching rate is 7.78%,and the manganese leaching rate is 34.86%.Compared with the conventional acid addition process,the total amount of sulfuric acid is reduced by 7.5 kg/t,the leaching rate of copper is increased by 2.94 percentage points,and the leaching rates of iron and manganese are decreased by 1.03 and 4.52 percentage points,respectively.Branch acid addition technology is ap-plied on site,on the premise that the copper leaching rate is not less than 82%,the dosage of sulfuric acid per ton of copper is reduced by 0.6 t,and the concentration of iron ion and manganese ion in the leaching solution is reduced by 0.75 g/L and 0.70 g/L,respectively.The new process can achieve the purpose of copper extraction,acid reduction and impurity control with-out adding new equipment and reagents,effectively reducing the production cost per ton of copper,improving the quality of feed liquid,and providing a new research idea for the efficient and clean leaching of similar copper oxide ores.
万方数据
维普
