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Preparation method for smelting high-silicon low-carbon silicomanganese alloy through one-step addition of silicon

A one-time, manganese alloy technology, which is applied in the field of ferroalloy preparation, can solve the problems of workers' difficulty in operating the furnace at high temperature, rising of the furnace's low slag surface, and cost increase.

Active Publication Date: 2017-03-29
石嘴山市宝利源特种合金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The addition of excessive carbon leads to a high coke content in the furnace charge, and the conductivity of coke is improved at high temperature, which leads to the lifting of the electrodes, so as to ensure the power transmission of the electrodes, resulting in a large increase in the temperature of the furnace surface, while the temperature of the bottom of the furnace drops. As a result, the low slag surface of the furnace continues to rise, affecting normal smelting and unstable product quality, increasing costs, and making it difficult for workers to operate at high temperature on the furnace surface
The existing shaking bag two-step production method and graphite flux two-step production process are complicated, high energy consumption, and unstable product quality

Method used

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  • Preparation method for smelting high-silicon low-carbon silicomanganese alloy through one-step addition of silicon
  • Preparation method for smelting high-silicon low-carbon silicomanganese alloy through one-step addition of silicon
  • Preparation method for smelting high-silicon low-carbon silicomanganese alloy through one-step addition of silicon

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Effect test

Embodiment 1

[0023] The preparation method of smelting high-silicon and low-carbon silicomanganese alloy with one-time external addition of silicon is to prepare a mixture with manganese content of 33.5%, silicon dioxide of 35%, and ferromanganese ratio of 5.0, and its particle size is 10mm-100mm; adding 25% of the mass of manganese ore coke, the carbon content of the coke is 80%, and its particle size is 25mm-40mm; add 6% of external silicon, the particle size is 10mm-100mm, and the content of phosphorus is 0.05%; the above-mentioned raw materials are continuously added to the submerged arc furnace, at 1600 Smelting above the temperature for 220 minutes, until the raw materials are completely melted, pour the liquid into the ladle, discharge the slag and iron out, and then cast it, you can directly get Mn ≥ 55%, Si ≥ 25%, P ≤ 0.1%, S ≤ 0.04%, C ≤ 0.3% high silicon low carbon silicon manganese alloy.

Embodiment 2

[0025] The preparation method of smelting high-silicon and low-carbon silicomanganese alloy with one-time external addition of silicon is to prepare a mixture with a mass content of 36.8% manganese, 38.5% silicon dioxide, and a ratio of manganese to iron of 8.8, with a particle size of 10mm-100mm; adding 26% manganese ore % of coke, the carbon content of coke is 80%, and its particle size is 25mm-40mm; add 7.5% of external silicon, the particle size is 10mm-100mm, and the content of phosphorus is 0.04%; the above raw materials are continuously added to the submerged arc furnace, and the Smelting above 1600 degrees for 220 minutes, until the raw materials are completely melted, pour the liquid into the ladder bag to discharge the slag and iron out, and then cast it, you can directly get Mn≥60%, Si≥27%, P≤0.1%, S≤0.02%, C≤0.2 % high silicon low carbon silicon manganese alloy.

Embodiment 3

[0027] The preparation method of smelting high-silicon and low-carbon silicomanganese alloy with one-time external addition of silicon is to prepare a mixture with a mass content of 37.5% manganese, 35% silicon dioxide, and a manganese-iron ratio of 9.2, and its particle size is 10mm-100mm; adding 26% manganese ore % of coke, the carbon content of coke is 80%, and its particle size is 25mm-40mm; add 7% of external silicon, the particle size is 10mm-100mm, and the total amount of phosphorus is 0.05%; The above smelting for 220 minutes, until the raw materials are completely melted, the liquid is poured into the ladder bag to discharge the slag and iron out, and then cast, and the Mn≥65%, Si≥25%, P≤0.12%, S≤0.03%, C≤0.3% can be directly obtained High silicon low carbon silicon manganese alloy.

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Abstract

The invention relates to a preparation method for smelting high-silicon low-carbon silicomanganese alloy through one-step addition of silicon, belonging to the technical field of ferroalloy preparation. Raw materials used in the invention are composed of manganese ore, exogenous silicon, coke, dolomite and fluorite. The preparation method comprises the following steps: continuously adding prepared raw materials into a submerged arc furnace for heating to a melting state; injecting molten liquid alloy into a two-step ladle, carrying out standing for 5 to 8 min and then carrying out deslagging; and after ladle-to-ladle treatment of the liquid alloy in the two-step ladle, carrying out casting so as to prepare the high-silicon low-carbon silicomanganese alloy comprising, by mass, 55 to 65% of Mn, 25 to 30% of Si, 0.05 to 0.1% of P, 0.01 to 0.03% of S and 0.05 to 0.5% of C. The method provided by the invention enables product quality to be improved, lowers, carbon consumption, saves electric energy, controls the downward insertion depth of an electrode, reduces the surface temperature of the submerged arc furnace, increases the service life of the submerged arc furnace and decreases production cost.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of ferroalloy preparation, and in particular relates to a preparation method for smelting high-silicon and low-carbon silicon-manganese alloy by one-time external silicon addition. [0003] Background technique: [0004] The mass percentage of silicon in the currently produced silicon-manganese alloy is 17%-21%. If the mass percentage of silicon is increased to 25%-30%, excess carbon must be added to reduce it. Only by adding 28%-32% carbon in the mass percentage of the total raw materials can the silicon in the smelted silicon-manganese alloy reach 25%-30%. The addition of excessive carbon leads to a high coke content in the furnace charge, and the conductivity of coke is improved at high temperature, which leads to the lifting of the electrodes, so as to ensure the power transmission of the electrodes, resulting in a large increase in the temperature of the furnace surface, while the temperature of ...

Claims

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Application Information

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IPC IPC(8): C22C22/00C22B4/06
CPCC22B4/06C22C22/00
Inventor 于国安于金圣
Owner 石嘴山市宝利源特种合金有限公司
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