Efficient smelting method of silicon-manganese alloy
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A smelting method and silicon-manganese alloy technology, which is applied in the field of high-efficiency smelting of silicon-manganese alloys, can solve problems such as low manganese recovery rate, difficult treatment of smelting slag and smelting waste gas, and achieve improved thermodynamic conditions, accelerated reduction reaction rate, and increased melting point Effect
Active Publication Date: 2021-06-08
平罗县阳光焦化有限公司
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[0005] In view of this, the present invention provides a high-efficiency smelting method of silicomanganese alloy to solve the technical problems of low manganese recovery rate and difficult treatment of smelting slag and smelting waste gas existing in the smelting process of silicomanganese alloy in the prior art
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Embodiment 1-6
[0051] Mix 2000Kg of manganese ore (average manganese content 28.5%), manganese-rich slag (average manganese content 36%) 800kg, silica 250kg, coke 450kg and pre-batch 50kg, mix them evenly, and send them into a 25000KVA closed silicomanganese alloy mine heat The smelting is carried out in a furnace, and the smelting is kept at a smelting temperature of 1600°C to 2000°C for 3h to 6h.
[0052] Wherein, in the pre-batching, the parts by weight of each substance are shown in the following table:
[0053] Parts by weight of each substance in pre-batching in table 1 embodiment 1-6
[0054] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Washing slag (parts) 100 100 200 200 150 150 Silicon-manganese alloy slag (parts) 100 100 50 50 80 80 Alumina (parts) 5 10 5 10 5 10 Smelting dust (parts) 20 50 20 50 20 30
[0055] Among them, the configuration process of pre-batching is: the reduction flue gas produc...
Embodiment 7
[0057] Mix 2000Kg of manganese ore (average manganese content 28.5%), manganese-rich slag (average manganese content 36%) 800kg, silica 250kg, coke 450kg and pre-batch 100kg, mix them evenly, and send them into a 25000KVA closed silicomanganese alloy mine heat The smelting is carried out in a furnace, and the smelting is kept at a smelting temperature of 1600°C to 2000°C for 3h to 6h.
[0058] Among them, the pre-batch contains 100 parts of water washing slag, 100 parts of silicon-manganese alloy slag, 5 parts of alumina and 20 parts of smelting dust by weight.
[0059] Among them, the configuration process of pre-batching is: the reduction flue gas produced by the submerged arc furnace is burned with fuel gas and oxygen-enriched to generate high-temperature dust-laden flue gas, and the high-temperature dust-laden flue gas contacts with water washing slag to obtain dry water washing slag and medium-temperature dust laden Flue gas, dry washing slag, wet washing slag, silicon-ma...
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Abstract
The invention provides an efficient smelting method of silicon-manganese alloy. The efficient smelting method comprises the following steps: adding raw materials including water-washing residues, silicon-manganese alloy residues, prebatching being prepared from smelting dust caused by dust removal of smelting flue gas, manganese ores and the like into a submerged-arc furnace and performing smelting so that waste residues produced in a smelting process of a part of silicon-manganese alloy are effectively treated on one hand, and the dried water-washing residues and silicon-manganese alloy residues are beneficial for improving the thermodynamics conditions of the submerged-arc furnace in a smelting process on the other hand, and thus, the smelting efficiency is improved. The water-washing residues and the smelting dust contain a large amount of calcium oxide and magnesium oxide, so that regulation demands on alkalinity in the submerged-arc furnace can be met, the dried water-washing residues, the silicon-manganese alloy residues and the smelting dust contain a large amount of silicon and manganese, and the recycling ratios of the silicon and the manganese are obviously increased after re-smelting. Meanwhile, the the dried water-washing residues and the smelting dust has higher smelting point, by coordinating with addition of aluminum oxide, the furnace residue smelting point can be effectively increased, and thus, the furnace temperature is improved, and reduction reaction velocity in the submerged-arc furnace is quickened.
Description
technical field [0001] The invention belongs to the technical field of metallurgy and chemical industry, and in particular relates to a high-efficiency smelting method of silicon-manganese alloy. Background technique [0002] Silicon-manganese alloy is an alloy composed of manganese, silicon, iron, a small amount of carbon and other elements. It is a ferroalloy with wide application and large output. It is used as a reducing agent for the production of manganese metal by electrosilicothermal method. Silicon-manganese alloy is produced by simultaneously reducing manganese ore (including manganese-rich slag) and manganese oxide and silicon dioxide in silica with charcoal in a submerged arc furnace. The traditional silicon-manganese alloy production process produces a large amount of waste gas and waste slag, causing serious pollution to the atmospheric environment and soil environment. Therefore, enterprises have to invest a huge amount of treatment costs, but with little eff...
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