Formula for recycling silicon-manganese alloy slag during silicon-manganese alloy production

Abstract

The invention relates to a formula for recycling silicon-manganese alloy slag during silicon-manganese alloy production, wherein the formula comprises manganese-rich ore and an auxiliary material, and the auxiliary material comprises dolomite and silica. The formula is characterized in that a silicon-manganese slag preparation material is adopted to replace dolomite and is added to manganese-rich ore. According to the present invention, the silicon-manganese slag preparation material can be adopted to replace dolomite, silica and other auxiliary materials or reduce addition amounts of dolomite, silica and other auxiliary materials so as to increase the manganese fed to the furnace in the whole ore, importantly the characteristic that the silicon-manganese slag has high Al2O3 content is adopted to increase Al2O3 of the material fed to the furnace, and the Al2O3 fed to the furnace is increased to 6-7% from the original about 3%, such that the Al2O3 content in the final slag is increased to about 18-20% from the original about 10% so as to substantially improve furnace material smelting performances.

Description

technical field [0001] The invention relates to a formula for reusing silicon-manganese alloy slag in silicon-manganese alloy production. Background technique [0002] For a long time, the idea of ​​ore blending for silicon-manganese alloy production is similar to the ore blending for smelting high-carbon ferromanganese, that is, to meet the quality requirements of the smelted products and strictly control the ratio of manganese to iron and phosphorus to manganese. In terms of technical and economic indicators for improving production by rationally matching ore, it is basically followed that the higher the manganese content, the better, and attaches great importance to improving the grade of manganese ore fed into the furnace. On the contrary, the slag composition (SiO2) contained in the ore 2 、Al 2 o 3 , CaO, MgO) have less or only qualitative but no quantitative considerations. This is bound to raise the following questions: [0003] 1) The manganese content of the fur...

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Problems solved by technology

[0004] 2) The manganese content of the ore entering the furnace is high, but the content of slag-forming substances is not ideal. The amount of flux (dolomite) and the above-mentioned auxiliary raw materials such as silica is too much, which will not only change the thermodynamic conditions of the reaction in the furnace, but also increase The amount of slag or slag ratio will lead to an increase in the unit power consumption of smelting, which is not conducive to the improvement of indicators

[0005] 3) In pursuit of the manganese grade of the ore, the components useful for the smelting of the manganese-silicon alloy contained in the ore are ignored, resulting in some manganese ores with low manganese grades and comprehensive components suitable for smelting of this variety not being utilized, wasting manganese ore resources

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