Method for removing lead, zinc, arsenic, antimony, bismuth and tin from copper matte

Abstract

The invention discloses a method for removing lead, zinc, arsenic, antimony, bismuth and tin from copper matte. The method comprises the following steps of: placing crushed and dried copper matter in a vacuum distillation furnace, maintaining residual voltage in the furnace at 1-100 Pa and a volatilization temperature at 1100-1400 DEG C, and carrying out heat preservation for 0.5-1.5 hours, so that impurity elements such the lead, the zinc, the arsenic, the antimony, the bismuth and the tin in the copper matte are volatilized at metallic state or vulcanization state; condensing in a condenser so as to separate the lead, the zinc, the arsenic, the antimony, the bismuth and the tin from copper matte, thus obtaining the purified copper matte or lead and zinc multi-element alloy. The contents of the Pb, the Zn, the Bi and the Sn in the copper matte are respectively reduced to 0.001% to 0.01%, the content of the As can be reduced to 0.01% to 0.1%, and the content of the Sb is reduced to 0.01% to 1%. The method has the advantages that the copper matte is purified by adopting a vacuum metallurgy method, the technological process operation is convenient, safe and controllable, the environmental pollution is low, the removal rate of the lead, the zinc, the arsenic, the antimony, the bismuth and the tin is high, the industrialized application is easy, the obtained lead and zinc multi-element alloy can be recycled and sold, and the economic benefit is obvious.

Description

technical field [0001] The invention relates to a method for removing lead, zinc, arsenic, antimony, bismuth and tin from matte copper, and belongs to the technical field of nonferrous metal pyrometallurgy. Background technique [0002] Copper is mainly sulfide ore and oxide ore in nature, especially sulfide ore is the most widely distributed, and about 80% of copper ore exists in the form of Cu-Fe-S ore. Pyrometallurgy is usually used to extract copper from sulfide ores. The general process is: copper sulfide ore → mining process → copper concentrate → smelting process → matte copper → blowing process → crude copper → anode furnace process → anode copper → Electrolysis process → high-purity cathode copper. [0003] In recent years, due to the drastic expansion of copper smelting capacity, the supply of high-quality copper concentrates has become increasingly tight. In order to meet the needs of production and pursue more profits, most ore-buying smelters have to purchase h...

AI Technical Summary

Problems solved by technology

[0004] 1. Due to the increase in the content of impurity elements such as lead and zinc, the melting point of smelting slag and blowing slag increases, the viscosity of slag increases, and it is difficult to discharge slag

[0005] 2. Part of the impurity elements volatilize into the flue dust, causing the viscosity of the flue dust to increase, and the molten flue dust forms nodules on the inner side of the furnace wall, the inner wall of the flue, and the connection between the flue and the waste heat boiler

[0007] 4. The content of lead, zinc, bismuth, tin and other impurities on the mineral anode plate exceeds the standard, seriously affecting the normal production of the electrolysis workshop, prone to high cell voltage, large-area anode passivation, more floating anode slime in the electrolyte, and cathode copper plates Many long particles, etc.

Especially at high current density (300~450A / m 2 ), these problems have a magnification effect and will become more serious

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