Technology for directly extracting copper and zinc by using copper dust wet method

Abstract

The invention discloses a technology for directly extracting copper and zinc by using a copper dust wet method for carrying out high-activity processing on a low-grade copper dust material. The technology provided by the invention comprises the following steps of leaching, removing organic matters, extracting copper, removing iron, aluminum and chromium, extracting zinc, and leaching a zinc-free solution (20-30% of open loop can be achieved during the process). The technology provided by the invention has the advantages that a direct extracting operation technology is adopted, more low-grade copper dust can be recycled, the total amount of environment waste is reduced, meanwhile, the product percent conversion is high, the added value of a product is high, the cost is low, the technology has energy-saving and an environment-friendly properties, the low-grade high-impurity dust material which is generated by smelting crude copper through a pyrogenic process and is hard to process at present can be processed, and the valuable metal of the low-grade copper-zinc dust is fully recycled.

Description

technical field [0001] The invention relates to a treatment technology for copper soot produced in a pyro-method refining crude copper plant, and is mainly aimed at the treatment of low-copper, low-zinc, chlorine-containing and high-impurity materials. Through the optimization and adjustment of leaching and extraction process parameters, the emulsification and three-phase problems in extraction are solved, so as to realize the extraction of copper with special extractant. By controlling the impurity components and adjusting the pH value, the effect similar to that of special zinc extraction is achieved. High-purity copper material and high-purity zinc material are obtained by back extraction respectively, and metal products are subsequently obtained by conventional electrowinning. [0002] The present invention starts from the fundamental point, upgrades the process, greatly improves the product yield rate and product conversion rate, reduces emissions from the source, and ef...

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Problems solved by technology

[0006] (1) Direct return to the furnace; because the content of the target element for material extraction is low, and it is a volatile component, chlorine is more harmful to the furnace body, and the actual recovery rate of direct return to the furnace is too low, and often only one of copper or zinc can be extracted. Therefore, the economic benefit is relatively the worst

(2) Recycle only as copper material or only as zinc material by a single wet process; because the two components of copper and zinc are not high, the recovery of copper and zinc requires a large amount of alkali treatment, the cost is high and not generate real benefits

[0008] The CN101775502A "Copper Extraction Process of Wet Zinc Smelting Process" published by the Chinese patent in 2010 is a two-step copper replacement scheme, which is part of the above (3). The actual yield of copper is not high about 80%, and the price of zinc powder for replacement is relatively high.

The focus is on zinc recovery, but the function of purified zinc products has not been brought into play, and the production and operation costs are relatively high. The zinc recovered after extraction is returned to the leaching process, and the added value of the product is not high.

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