Method and process for smelting chromium carbide
Release time:
2021-11-19 09:30
Source:
The invention relates to metallurgy, in particular to a method for smelting chromium carbide. Chromium carbide as a metal carbide oxidation resistance is very good, with high hardness, good elasticity, corrosion resistance, high melting point, wear resistance, chemical stability and other benefits. Nass has been widely used in metallurgical industry, electronics industry, aerospace, high temperature resistant coatings and other fields. The existing production method of chromium carbide chromium metal recovery rate is low, the cost is very high, the production process will also produce sewage and red mud. Every ton of metallic chromium produces 0.645 tons of pollution caused by aluminum production; high energy consumption. In the carbothermal reduction and carbonization method of chromium oxide, the product obtained by solid reduction with chromium oxide graphite powder is high in free carbon and sponge-like, which cannot meet the needs of some markets. And the cost is relatively high.
In view of the deficiency of the preparation method of chromium carbide in the existing technology, the technical staff provides a smelting method of chromium carbide, using electric energy and carbon reducing agent to produce chromium carbide, which can greatly reduce the production cost, and compared with the aluminum thermal method combined with carbonization method, the recovery rate of metal chromium is increased by more than 13%. Compared with the existing technology, the metal aluminum in the aluminum thermal reduction smelting metal chromium method comes from the electrolysis of metallurgical alumina produced by chemical industry, and sewage and red mud are produced in the chemical process; the production of chromium carbide by electric heating carbon reduction process can reduce the consumption of 0.645 tons of aluminum per ton of chromium produced, and at the same time reduce the pollution caused by the production of 0.345 tons of aluminum. In order to facilitate comparison, the energy consumption of producing one ton of metal chromium and one ton of standard coal by electro-carbon method is calculated, and the energy consumption per ton of metal chromium is reduced by 0.67 tons of standard coal. The smelting method of chromium carbide includes the following steps: 1. mixing metallurgical chromium trioxide and carbonaceous materials evenly in proportion to obtain a mixture; wherein the quality of carbon is 1.0-1.1 times the quality of metallurgical chromium trioxide that can reduce the quality of all components. 2. Put the mixture into an electric furnace, raise the temperature to 1540-1850, and carbonize electrothermally to obtain chromium carbide; 3. sink the chromium carbide into the bottom of the electric furnace, take it out, and cool it to room temperature naturally to obtain chromium carbide. In one step, the carbonaceous material is one or a mixture of activated carbon, graphite powder and carbon black. Second, the electric furnace is one of a DC electric arc furnace, an AC electric arc furnace or a plasma furnace. In the second step, the oxygen product obtained as a by-product is discharged from the electric furnace to recover the heat released by combustion. In the two steps, the mixture is preferably fed stepwise, and may be fed slowly batchwise or continuously.
Compared with the prior art, the present invention has the following beneficial effects: the present invention directly uses metallurgical chromium oxide to prepare chromium carbide. Compared with the prior art, the present invention first uses metallurgical chromium oxide to prepare metal chromium through aluminothermic reduction method, and then carbonizes metal chromium powder to prepare chromium carbide. Since part of chromium metal will be lost in alumina slag produced by aluminothermic method, the recovery rate of chromium metal in the present invention is increased by more than 13%, and the recovery rate of chromium metal in smelting process is only 85-87%; Every ton of chromium produced reduces the consumption of 0.645 tons of aluminum, at the same time, the pollution caused by the production of 0.345 tons of aluminum is reduced, and the method of the present invention reduces the cost, and improves the competitiveness of the product for enterprises with large production capacity.
Chromium carbide
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