Method for producing low carbon manganese-silicon alloy through external refining by adopting two-step method

Abstract

The invention discloses a method for producing low carbon manganese-silicon alloy through external refining by adopting a two-step method. The method comprises the following steps: adopting a submerged arc furnace of 25500 KVA or above to produce a silicon manganese alloy product containing 22-24% of silicon; loading the silicon manganese alloy product containing 22-24% of silicon into a 20-ton intermediate frequency furnace, adding silicon iron of which the weight is 5%-15% that of the silicon manganese alloy product in the intermediate frequency furnace, electrifying the intermediate frequency furnace for smelting for 5-15 minutes, adding a slagging element of which the weight is 2.4% that of the silicon manganese alloy product and a covering agent of which the weight is 0.8% that of the silicon manganese alloy product for refining for 15-25 minutes after the temperature reaches 1400 degrees or above, cutting off the power after the completion of refining, and leaving to stand for 5 minutes; and slagging off, tapping and pouring, so as to finally obtain the low carbon manganese-silicon alloy in which the content of Si is higher than or equal to 27% and the content of C is lower than or equal to 0.2%. According to the method for producing low carbon manganese-silicon alloy through external refining by adopting the two-step method, the production scale is large, the product quality is stable, the operation is stable, the production cost is low, the cost is reduced by RMB 461 per ton, and the product grade ratio reaches 95% or above.

Description

technical field [0001] The invention relates to a production method for refining a low-carbon manganese-silicon alloy outside a furnace by adopting a "two-step method", belonging to the technical field of ferroalloy smelting. Background technique [0002] The traditional production method of low-carbon manganese-silicon alloy is completed in one step in submerged arc furnace. This method is widely used in small submerged arc furnaces of 6300KVA and below. With the requirements of national industrial policies, submerged arc furnaces below 12500KVA have basically been eliminated. The furnace type in the ferroalloy industry is developing in the direction of large-scale and closed. [0003] Low-carbon manganese-silicon alloys are produced in large semi-closed furnaces. The actual operation of domestic manufacturers: the product grade rate is within 70%, and the production cost is difficult to control. [0004] The production of low-carbon manganese-silicon alloys containing Si...

AI Technical Summary

Problems solved by technology

[0003] Low-carbon manganese-silicon alloy is produced in a large semi-closed furnace. The actual operation of domestic manufacturers: the product grade rate is within 70%, and the production cost is difficult to control

[0004] The production of low-carbon manganese-silicon alloys containing Si≥27% and C≤0.2% using closed submerged arc furnaces of 25500KVA and above is still in the exploration stage, and continuous and stable production has not been possible so far.

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