Smelting method of chromium carbide

Abstract

The invention discloses a smelting method of chromium carbide, which belongs to the technical field of metallurgy. The method comprises the following steps: uniformly mixing metallurgical chromium sesquioxide and carbon in proportion to obtain a mixture; and putting the mixture into an electric furnace, heating to 1540-1850 DEG C, and carrying out electric heating carbonization to obtain chromiumcarbide. According to the method, electric energy and a carbonaceous reducing agent are adopted for producing chromium carbide, and the production cost can be reduced; compared with an aluminothermicmethod combined with a carbonization method, the chromium metal recovery rate is increased by 13% or above; compared with the prior art, in the process of producing chromium carbide by smelting metalchromium through an aluminothermic reduction method, the consumption of 0.645 ton of aluminum is reduced in the process of producing each ton of chromium, and meanwhile, the pollution generated in theprocess of producing 0.345 ton of aluminum is reduced; and the energy consumption of each ton of chromium metal is reduced by 0.67 ton of standard coal.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for smelting chromium carbide. Background technique [0002] As the carbide with the highest oxidation resistance among metallic carbides, chromium carbide has the advantages of high hardness, high elastic modulus, chemical corrosion resistance, high melting point, wear resistance, and strong chemical stability. It is used in the metallurgical industry, electronics There are applications in industry, aerospace, high temperature resistant coatings and other fields. [0003] And existing chromium carbide production method has: one), metal chromium powder carbonization method: take metal chromium as raw material milling and add carbonaceous (such as: graphite powder), after adding binding agent (such as: methyl cellulose) mixing Make blocks, put them into a vacuum sintering furnace after drying at 1500°C to sinter to obtain chromium carbide; 2), chromium oxide carbother...

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Problems solved by technology

[0003] And existing chromium carbide production method has: one), metal chromium powder carbonization method: take metal chromium as raw material milling and add carbonaceous (such as: graphite powder), after adding binding agent (such as: methyl cellulose) mixing Make blocks, put them into a vacuum sintering furnace after drying at 1500°C to sinter to obtain chromium carbide; 2), chromium oxide carbothermal reduction carbonization method: use dichromium trioxide to add carbonaceous (such as: graphite powder), and add a binder , block after mixing materials, and sinter in a vacuum furnace to obtain chromium carbide; among them, each method also has its own problems: for example: in the metal chromium powder carbonization method, metal chromium is used to make chromium carbide, and the recovery rate of chromium metal is low , the cost is high; and, in the preparation of metal chromium, the aluminothermic reduction method is adopted, and its metal aluminum comes from the electrolysis of metallurgical aluminum oxide produced in chemical industry, and sewage and red mud will be produced in the chemical process; every ton of metal chromium 0.645 tons of pollution from aluminum production; high energy consumption

[0004] For the chromium oxide carbothermal reduction carbonization method, the product obtained by solid state reduction with dichromium trioxide + graphite powder has high free carbon and a spongy shape, which cannot meet the needs of some markets; the cost is relatively high;