Treatment method for waste copper-bearing magnesite brick

Abstract

The invention belongs to the technical field of nonferrous metallurgy, and particularly relates to a treatment method for a waste copper-bearing magnesite brick. The method specifically comprises the following steps that 1, the waste magnesite brick is obtained through waste acid pickle generated in the copper smelting process in a leached manner, and then leaching liquid and leaching residues are filtered and separated out; 2, a precipitator or a reducing agent is added into the copper-bearing leaching liquid, copper is precipitated in the manner of indissolvable compounds or simple substances, and precipitated copper residues are filtered out and collected; 3, the leaching residues and the precipitated copper residues are washed and dried to return to a copper smelting system for treatment, and valuable metal such as Cu, Au and Ag is recycled; and 4, liquid obtained after copper precipitation is adopted as raw materials for preparing magnesium sulfate or magnesium-bearing gypsum residues, and magnesium in the liquid obtained after copper precipitation is recycled. Waste is used for treating waste, the method has the advantages that the process is simple, the production cost is low, the equipment investment is small, cleanliness and environment friendliness are achieved, and the industrial production can be achieved easily.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal metallurgy, and in particular relates to a treatment method for copper-containing waste magnesia bricks. Background technique [0002] At present, large-scale copper smelting enterprises in China mostly adopt the pyrotechnic process of "copper matte smelting-matte blowing-refining". In direct contact with matte and blister copper melts, physical and chemical reactions inevitably occur. About 50% of refractory materials are eroded into the metallurgical slag during use, and the remaining part is treated with waste magnesia bricks during the repair of metallurgical furnaces. These waste refractory bricks contain a large amount of copper, gold, silver, lead, arsenic, and chromium. , Magnesium and other valuable metal elements. Since the magnesium oxide content in the waste magnesium brick is too high (30-80%), if it is directly added to the melting furnace for melting, MgO is easy to form ...

AI Technical Summary

Problems solved by technology

There are following problems in these methods: (1) it is difficult to obtain high-grade copper concentrate and high valuable metal recovery rate simultaneously by adopting the method of gravity separation and flotation, and the recovery rate of copper is generally lower than 90%; The content of magnesium oxide in the concentrate is still high, so it is difficult to smelt directly into the furnace; the one-time investment of equipment is large and the process flow is long; the flotation process needs to add a variety of organic flotation agents and collectors, and a large amount of Flotation wastewater containing organic matter increases wastewater treatment capacity

(2) Use sulfuric acid leaching to remove the magnesia of waste magnesia bricks, because the content of magnesia in waste magnesia bricks is very high, so need to consume a large amount of acid; (3) when sulfuric acid leaching waste magnesia bricks, part of the copper oxide will be removed Leaching into the liquid phase, the current sulfuric acid leaching process does not recover this part of the copper

[0004] A large amount of acidic waste liquids such as sulfuric acid and hydrochloric acid will be produced in the process of copper smelting. The purification process of these acidic waste liquids needs to consume a large amount of alkali, and the waste acid has not been effectively used, which causes waste of resources and environmental pollution.

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