Waste-free environment-friendly recovery method for copper-containing difficult-to-treat material

Abstract

The invention relates to a waste-free environment-friendly recovery method for copper-containing difficult-to-treat materials, which comprises the following steps of: crushing the materials, grinding into ore pulp, and filtering to obtain ore grinding filter residues and ore grinding filtrate; carrying out low-acid iron leaching on the ore grinding filter residues, filtering to obtain low-acid leaching filter residues and low-acid leaching filtrate, recycling the ore grinding filtrate, neutralizing to be neutral by using acid waste liquid when the alkali concentration and impurities rise, and filtering to return to ore grinding for use; carrying out oxidation iron precipitation on the low-leaching filtrate, neutralizing until the pH value is 3-5, blowing compressed air at the temperature of 80-85 DEG C to oxidize low-valent iron ions so as to form iron colloidal precipitate, filtering to obtain neutralized purified liquid and neutralized iron precipitation slag, returning the neutralized purified liquid to low-acid iron leaching operation, and returning the neutralized iron precipitation slag to lead smelting and slagging; carrying out high-temperature high-acid oxygen pressure leaching on the low-leaching filter residues, and filtering to obtain high-leaching filtrate and high-leaching filter residues; cooling and saturating the high-leaching filtrate to separate out a copper sulfate crystal product, and feeding high-leaching filter residues to lead for smelting to recover lead and silver. The method is easy to operate, treats waste with waste, is low in cost, and efficiently recycles valuable metal in an environment-friendly manner without three wastes.

Description

technical field [0001] The invention relates to hydrometallurgy technology, in particular to a waste-free and environmentally friendly recycling method for copper-containing refractory materials. Background technique [0002] In the process of lead smelting and production, lead is a good collector for gold, silver and copper. The main production process often produces a kind of copper-containing refractory material of lead-silver-copper-iron polymetallic sulfide fusion, commonly known as lead matte. It is generally hard and blocky, difficult to break, difficult to grind and difficult to leach. Among them, the phase composition copper is Cu 2 S and CuFeS exist in the form, lead exists in the form of PbS, sulfur exists in the form of PbS, Cu 2 S form exists, and iron exists in the form of CuFeS. [0003] Copper associated with lead ore enters crude lead during pyrometallurgy, and smelting or sulfur addition is used to remove copper to produce copper scum during pyrorefining...

AI Technical Summary

Problems solved by technology

However, fire pretreatment methods also have derivative problems such as high energy consumption, poor environmental protection, and long process flow.

[0008] Since matte matte materials are hard to break, hard to grind, hard to leach, and there is no reliable and perfect treatment process to choose from, most enterprises can only choose to sell them externally, and a large amount of valuable metal resources such as lead, antimony, silver, tin, and indium are not priced or symbolic. Pricing brings large economic losses to enterprises and has become a key common technical problem in the recovery of associated copper resources in the smelting industry

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