Experimental Study on the Process of Extracting Copper from Low Grade Copper Oxide Ore by Tank
The process flow of secondary crushing of raw ore,concentrated acid curing and tank leaching was adopted in the experiment.After the raw ore is broken to a particle size of 5～10 mm,it is cured with concentrated sulfuric acid.The cured ore sample is directly used in the leaching test.When the initial H2SO4 concentration is 100 g/L,the liquid-solid ratio is 1.5∶1,and leaching temperature at normal temperature,the leaching rate of Cu reached 90%after leaching for 24 h.After the leaching residue was washed,the liquid was returned to the tank for recycling,and the leaching rate of Cu reached more than 93%.The bath leaching solution is copper sulfate solution,and the final product cathodic copper can be obtained by conventional extraction-electrolysis process.The experimental results show that the Cu recovery rate of low grade copper oxide treated by this process is more than 93%.
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