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Low-Grade Copper Oxide Ores

     

The flotation-acid leaching process for complex low-grade copper oxide ores comprises the following steps:

The raw low-grade copper oxide ore is crushed, ground, and prepared into ore pulp;

Flotation reagents are added to the above ore pulp, and one stage of roughing and one stage of scavenging are conducted to obtain copper oxide concentrate and tailings;

The obtained copper oxide concentrate is prepared into ore pulp, then concentrated sulfuric acid is added for leaching under agitation. Solid-liquid separation is performed afterwards to produce copper-bearing leachate and leaching residue.

This process integrates flotation and acid leaching to treat low-grade copper oxide ores. The low-grade copper oxide ore is subjected to one-stage roughing and one-stage scavenging flotation in the presence of a sulfidizing agent, which realizes the preliminary separation of high acid-consuming silicate and carbonate minerals (including chlorite, dolomite, talc, etc.) from copper sulfide minerals in the ore. Combined with the subsequent acid leaching process, copper leaching can be achieved at a relatively low acid consumption. This process overcomes the defects of existing technologies for copper enrichment from low-grade copper oxide ores, such as complex process flow, high reagent consumption and high production cost.

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