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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