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New Metallurgical Processes for Gold and Silver Recovery

     

For readily treatable ores, the  Carbon-in-Pulp Process is now the most commonly used method. According to incomplete statistics, approximately 50% of the world's gold is produced via this process, which fully reflects its high production efficiency and wide penetration in the industry.

This process is adaptable to a very wide range of feed materials, leaving great flexibility for production arrangement. Combined with its considerable metal recovery rate and low investment cost, it is no surprise that it has become one of the most widely applied metallurgical industrial processes in the world.

Overall, the CIP process has significant economic advantages over the traditional cyanidation process. Its core differentiated advantage lies in the mechanism of gold recovery: the zinc cementation process (a supporting process of traditional cyanidation) recovers gold by reducing gold ions and depositing them onto zinc powder, which requires the production of completely clear filtrate, otherwise high-purity gold cannot be extracted at all.

The CIP process, by contrast, extracts gold directly from the pulp, so it can directly apply the straightforward and convenient solid-liquid separation procedure. This approach is not only simpler to operate, but also saves considerable costs on equipment and labor.

As mentioned in the previous operation steps of the cyanidation process, retaining the slurry in the conical tank for a certain period of time helps improve metal leaching efficiency, and the same rule applies to the adsorption tanks of the CIP process. However, compared with the traditional process, the CIP process is less susceptible to impurities in the leachate, eliminating the need for precise control of parameters such as cyanide concentration and dissolved oxygen concentration. The traditional process, by comparison, can only achieve a high metal leaching rate by relying on the stability of cyanide ions in alkaline solution and increasing the dissolved oxygen concentration in the solution.

These pain points are all resolved in the CIP process, which not only simplifies the operation procedure, but also reduces the workload of on-site operators.

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