Method for separating copper from lead copper matte

Abstract

The invention relates to a method for separating copper from lead copper matte, and belongs to the field of the wet-process metallurgy of non-ferrous metal. In the method, the lead copper matte is subjected to oxygen pressure leaching by adopting an NH3-(NH4)2SO4 alkalescent composite system at the temperature of between 110 and 200 DEG C; copper and NH3 undergo a coordination chemical reaction to enter solution, and other metal sulfides are converted into oxides / hydroxides and a sulfur element, the oxides / hydroxides and the sulfur element; and the copper and gold and silver are reserved in leaching residues, and the leaching residues return to a pyrometallurgical lead refining system and are subjected to batching to recover valuable elements such as lead, noble metal, simple substance sulfur. In copper-ammonia coordination solution, copper sulfate enrichment solution is obtained by the selective extraction of LiX84I and reextraction, and qualified cathode electrolytic copper is obtained by the conventional electrodeposition process of copper sulfate. By the method, the copper can be separated from the lead copper matte in one step, and the method is simple in a process, high in recovery rate of valuable metal, less in discharge of waste gas, waste water and waste residues, environment-friendly, low in requirement on equipment materials and safe and reliable in actual operation.

Description

technical field [0001] The invention relates to a method for separating copper from lead matte and belongs to the field of nonferrous metal hydrometallurgy. Background technique [0002] Copper is one of the most common associated elements in lead sulfide concentrates. During the oxygen-enriched smelting process in the bottom-blown furnace of lead sulfide concentrate, copper will form a separate matte phase through oxidation to matte reaction, commonly known as lead matte. Lead matte is a eutectic of metal sulfides such as Cu, Pb, Fe, As, Sb, and also dissolves Cu, Pb, Fe, Au, Ag, Se, Te and Fe in metallic state 3 o 4 . For leaded matte with high copper content (copper weight ratio Cu ≥ 30%), it is generally used as a copper smelting raw material for converter blowing to produce blister copper, and the lead volatilizes into the gas phase to obtain oxide dust. The common process flow Long, low metal recovery rate, large environmental pollution, high production costs and m...

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Problems solved by technology

The main problem of this process is the low concentration of SO produced by the oxidation roasting process. 2 Flue gas is difficult to make acid, which seriously pollutes the ecological environment

Moreover, if the roasting temperature is not properly controlled, it is very easy to cause the material to sinter, the residual rate of calcined sand is high, and the metal recovery rate is greatly reduced accordingly.

[0003] On July 23, 2008, the Chinese Invention Patent Application Publication No. CNl01225476A disclosed a process for recovering copper from lead matte, which is to realize the direct leaching of lead matte through an oxygen pressure acid leaching process in a sulfuric acid system, and the copper sulfate solution The electrolytic recovery of electrolytic copper is carried out, and the lead and silver slag is returned to the pyrometallurgical lead smelting system. The whole process is short and the discharge of three wastes is small. However, the acidic pressure leaching system generally has the problems of large equipment corrosion and high maintenance costs, and the leaching process has poor selectivity. Causes a certain degree of dispersion of valuable metals

The main problem of this process is that the oxygen consumption is large, a large amount of sodium sulfate waste liquid is produced, and Si in the raw material will also dissolve in a large amount, resulting in difficulty in liquid-solid separation.

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