Method for recycling stone coal navajoite waste slag

A stone coal vanadium and waste slag technology is applied in the field of using stone coal vanadium ore waste slag recovery and reuse to extract and produce high-purity metal chromium, which can solve the problems of low recovery rate and waste of metal chromium, achieve improved purity, low production cost, and The effect of three waste discharge

Inactive Publication Date: 2012-07-18
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY +3
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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 re

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  • Method for recycling stone coal navajoite waste slag

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Embodiment 1

[0033] The waste slag (the main component content is: Cr 2 O 3 : 30% to 50%, SiO 2 : 25% ~ 30%, CaO: 2% ~ 4%, Al 2 O 3 : 15%~20%, MgO: 4%~8%) mixed with coke, starch by weight 50:10:1 proportioning ratio, put into the ball mill to grind and mix the mixture for 2 hours, add 2 % fluorine salt, compressed into honeycomb blocks, put the blocks into an electric arc furnace with quicklime (CaO) for smelting, the temperature is 1900K, heat preservation for 40 minutes, and vacuum is drawn during the heat preservation process. After the furnace material is melted, shake the electric arc furnace to make the furnace liquid fully react, power off and calm down, and slag is discharged. Turn on the furnace fluid to flow, then add chromium oxide twice the weight of the coke, control the temperature at about 1900°C, and keep it for 50 minutes. Cut off the power supply of the electric arc furnace, remove the electrodes, and separate the smelted products after the mixture is cooled. The s...

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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...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B34/32
CPCY02P10/20
Inventor 贺跃光潘颖青李立海吴铁军吴盛才
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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