Continuous process for producing manganese-silicon alloy and slag rich in silicomanganese and producing micro-and low-carbon manganese-silicon alloy by utilization of slag rich in silicomanganese

Abstract

The invention provides a continuous process for producing manganese-silicon alloy and slag rich in silicomanganese and producing micro-and low-carbon manganese-silicon alloy by the utilization of the slag rich in silicomanganese. The continuous process is characterized by including the steps that the slag rich in silicomanganese is obtained while the manganese-silicon alloy is smelted in a submerged arc furnace; the submerged arc furnace is used for smelting; a product with the manganese-silicon alloy number being FeMn68Si18 is produced, and meanwhile liquid slag rich in silicomanganese is obtained, wherein the liquid slag rich in silicomanganese comprises 20%-26% by weight of manganese and 40%-50% by weight of silicon dioxide, and the mass ratio of Mn to Fe in the liquid slag rich in silicomanganese is 20-70; layered casting is performed on the obtained liquid slag rich in silicomanganese; raw material matching is performed on 30-40 parts of the slag rich in silicomanganese, 10-20 parts of carbon manganese slag containing 40%-45% by weight of manganese, 40-50 parts of manganese ore containing 40%-50% by weight of manganese, 25-35 parts of coke and 15-25 parts of silica, and smelting is performed for 2-6 hours by the utilization of an ore-smelting electric furnace to produce a finished product of the micro-and low-carbon manganese-silicon alloy, wherein the granularity of the obtained slag rich in silicomanganese is larger than 0-150mm, the slag rich in silicomanganese comprises 20%-26% by weight of manganese and 40%-50% by weight of silicon dioxide, the content of phosphorus is less than 0.1% by weight, and the mass ratio of Mn to Fe is 20-70. The comprehensive recovery rate of Mn is 95%-97%.

Description

technical field [0001] The invention belongs to the technical field of ferrous metallurgy metallurgy, and relates to a continuous process for producing manganese-silicon alloy and silicon-rich manganese slag and producing micro- and low-carbon manganese-silicon alloys by using the silicon-rich manganese slag. Background technique [0002] In the ferrous alloy smelting industry, the existing manganese-silicon alloy production, Chinese Patent Publication (Announcement) No. CN102766775A discloses "a production method of low-carbon high-silicon-silicon-manganese alloy", which is divided into two steps, the first step It is: adopting a mixed charge with a mass content of manganese of 30-35%, a mass content of silicon dioxide of 28-32%, and a mass ratio of Mn / Fe of 5.5-6.2, and at the same time, adding coke accounting for 18-22% of the total weight of the mixed charge. Slag removal to obtain common manganese-silicon alloy molten iron with component mass percentages of Mn60-70%, S...

AI Technical Summary

Problems solved by technology

The shortcoming of this low-carbon manganese-silicon alloy production method is that the selection of manganese raw materials into the furnace is less flexible, such as: "15-50 parts of manganese slag containing 20wt%-40wt% manganese", and 20wt% manganese-containing Manganese slag is a by-product of medium and low carbon ferromanganese alloy "medium manganese slag". It has high alkalinity, is easy to pulverize and is low in production, and the proportion of micro-carbon manganese-silicon alloy raw materials is small. Due to high alkalinity, other low-priced Ratio of manganese raw material with high alkalinity

The manganese slag containing 40wt% manganese is a high-carbon ferromanganese alloy by-product "manganese-rich slag". Its quality is good but the price is expensive. When the proportion of the low-carbon manganese-silicon alloy raw material is large, the cost will increase.

[0004] So far, there are no reports and practical applications on the production of manganese-silicon alloys and silicon-rich manganese slag and the continuous process of producing micro- and low-carbon manganese-silicon alloys using silicon-rich manganese slag