Method for recycling stone coal navajoite waste slag

Abstract

Provided is a method for recycling stone coal navajoite waste slag. The method comprises the steps, mixing waste slag obtained after vanadium is extracted from stone coal navajoite, coke and starch according to the weight ratio of 50:(8-15):(0.8-1.5) to form a mixed material, performing ball milling, adding villiaumite reducing a melting point of the mixed material, and pressing to form honeycomb-shaped block pieces; placing the block pieces and quicklime in an electric arc furnace, and performing vacuum melting; enabling the adding amount of the quicklime to be subjected to the fact that thepH of furnace slag is controlled within a range between 1.5 and 2.5; after furnace burden in the electric arc furnace is fully melted, shaking the electric arc furnace to enable furnace liquid to fully react, and then discharging slag; adding chromium oxide with the purity not lower than 99% into the furnace burden after the slag is discharged so as to continue the reaction, and enabling C and Siimpurities in the furnace burden after the slag is discharged to be fully oxidized by adding chromium oxide; controlling the temperature of the electric arc furnace in the melting and reaction process of the furnace burden at 1,850K-1,950K; obtaining a primary product after cooling, layering and slag removal; and adding carbon powder with the quality purity not lower than 99% into the primary product, performing oxidation-reduction reactions in a vaccum furnace so as to reduce hydrogen content and oxygen content in the primary product and obtain a pure product.

Description

technical field [0001] The invention relates to a method for recycling industrial waste residues, in particular to a method for extracting and producing high-purity metal chromium by recycling stone coal vanadium ore waste residues. Background technique [0002] China is a big producer and consumer of chromium. According to incomplete statistics, my country produced more than 15,000 tons of chromium metal in 2011, and the main user groups are iron and steel, electrical alloys, special metals, welding materials and other related enterprises. At the same time, chromium is also one of the necessary materials for semiconductors, chips, precision electronic products, display screens and high-end optical material coating targets. With the continuous expansion of the scale of high-tech products such as target materials, the market demand for deoxidized and degassed high-purity chromium powder is also rapidly expanding, and the technical requirements are also continuously improving...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for recovering and reusing stone coal vanadium ore waste slag in industrial waste residues. At the same time, it can also overcome the defect of low recovery rate of metal chromium in the production of chromium oxide reduction and extraction in the past; avoid the waste of resources, greatly reduce environmental pollution, and improve the utilization rate of resources

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