A method of using gypsum slag to strengthen recovery of valuable metals in copper smelting slag

Abstract

The invention discloses a method for using gypsum slag to strengthen the recovery of valuable metals in copper smelting slag, comprising the following steps: (1) mixing the gypsum slag and a carbonaceous reducing agent uniformly, and granulating or tableting to obtain mixed granules or mixed flakes; (2) adding the obtained mixed pellets or mixed flakes into the high-temperature copper smelting slag; (3) slowly cooling the mixture obtained in step (2) to obtain slow cooling slag. Compared with the existing process, the method of the invention not only has low energy consumption, but also has high metal recovery rate, low cost, simple process, simple material, easy industrial application, and has high industrial application prospect and value.

Description

Technical field [0001] The present invention belongs to metallurgy engineering, chemical engineering and industrial solid waste resource utilization technology, and is related to a method of re-recovering a coated coil melting slag in a copper melting score. Background technique [0002] The fire-making brown generally contains the influenza smelting, ice copper blowing, anode refining and anode casting, and an anode plate for outputting the refined refining. The process will generate a smelting slag equivalent to 3 to 4 times the quality of metal copper, mainly by Fe x O, SIO 2 , Cao, Mgo, Zno, Al 2 O 3 The oxide components consist of while containing a small amount of Cu, Ni, Ag and other valuable metals and harmful elements such as AS, PB. Blowing the slag and fire-making refining slag typically contains high copper, but the volume is small and can be used as a return treatment. [0003] Smelting slabs is the largest smelting slag of the copper smelter. It is also the main way...

AI Technical Summary

Problems solved by technology

Production practice and scientific research show that the production of high-grade matte will lead to slag containing Fe 3 o 4 On the high side, the viscosity of slag increases, the separation conditions of matte and slag become worse, and the copper content in slag increases

[0007] CN101491789A discloses the beneficiation process of flash furnace, converter and depleted electric furnace three kinds of copper smelting process mixed rolling, adopts beneficiation method to recover copper in the mixed slag, but it is found that the recovery of valuable metals in oxidation state is difficult, and the comprehensive recovery rate of metals is low

However, the cost of this process is relatively high, and more copper is lost with the electric furnace slag

CN104404259A is an improvement on the depletion process of ordinary electric furnaces, and discloses a method for recovering valuable metals through co-processing of copper-nickel-cobalt smelting slag and gypsum slag. 2 The reducing agent, gypsum slag and flux are injected into the depleted electric furnace, and after standing in a constant temperature range, the valuable metals are recovered from the matte phase, and the depleted slag is water-quenched as cement raw material. This method increases the sulfur content of the slag through gypsum. content, which is conducive to the transformation of copper in slag into matte, but this method has high energy consumption, high residual Cu content in slag, and the comprehensive metal recovery rate is lower than that of the slow cooling-flotation process, and the materials are complex and the preparation process is long. Need to rely on depleted electric furnace, limited application and other defects

Images