Leaching method for recovering copper from malachite copper oxide ores

Abstract

The invention belongs to the technical field of mineral metallurgy, and concretely discloses a leaching method for recovering copper from malachite copper oxide ores. The method is characterized in that an organic acid trichloroacetic acid solution is used as a leaching agent to leach copper from the copper oxide ores, the leaching temperature is 20-60DEG C, copper oxide ores with the granularity of below 38[mu]m account for 75-95% of the weight of the copper oxide ores, a certain concentration of the trichloroacetic acid solution is mixed with copper oxide ore powder according to a liquid / solid mass ratio of 5-20:1, and the obtained mixture is fully stirred for 30-60min to obtain a copper-containing solution suitable for later copper extraction and electrodeposition treatment. The leaching method uses the characteristics of simple preparation and high leaching rate of the leaching agent, reduces the environment pollution and facilitates the comprehensive utilization of resources by using trichloroacetic acid wastes generated in the pharmacy and chemical industry, guarantees the high copper leaching rate without high temperature or a pressurizing device, and also has the advantages of simple operation and low process cost.

Description

technical field [0001] The invention belongs to the technical field of mineral metallurgy, and in particular relates to a leaching method for recovering copper from malachite-type copper oxide ore. Background technique [0002] Copper is one of the most ubiquitous and valuable metals used in various industries. Copper can be used as a metal alloy material because of its thermodynamic properties and electrical conductivity. In the field of chemical industry, copper metal can be used as a catalyst for the oxidation of organic matter, hydrogen production and removal of nitrogen and sulfur oxide gases. In nature, copper often exists in the form of sulfide minerals and oxide minerals, such as chalcopyrite (CuFeS 2 ), Bornite (Cu 5 FeS 4 ), chalcocite (Cu 2 S), copper blue (CuS) belong to copper sulfide minerals; and malachite (Cu 2 (OH) 2 CO 3 ), Chrysocolla ((Cu,Al) 2 h 2 Si 2 o 5 (OH) 4 ·nH 2 O) and azurite (Cu 3 (OH) 2 (CO 3 ) 2 ) and so on belong to copper o...

AI Technical Summary

Problems solved by technology

However, inorganic acids have disadvantages such as poor selectivity in the leaching process, difficulty in purifying the leaching solution, and easy corrosion of equipment; when acid leaching ores containing a large amount of alkaline gangue minerals such as calcium and magnesium, the products tend to deteriorate the leaching environment and affect the leaching effect.

Chlorine, ammonia, etc. are easy to cause environmental pollution in the factory area because of their volatility