Method for preparing industrial silicon refining slag agent by using silica fume as raw material

Abstract

The invention relates to a method for preparing an industrial silicon refining slag agent by using micro-silicon powder as a raw material, which can achieve the purposes of effectively utilizing low-grade micro-silicon powder and improving the total yield and refining efficiency of metal silicon. The invention relates to a method for preparing an industrial silicon external refining additive by using micro-silicon powder as a raw material, which comprises the following steps: weighing a certain mass of micro-silicon powder, adding 0.8-1.2 times by weight of water and a combination which accounts for 2-7% of the mass of the micro-silicon powder to obtain a mixture, the combination is composed of at least one or two of sodium carboxymethyl cellulose, xanthan gum and sodium silicate, the sodium carboxymethyl cellulose is 1t; 4% of xanthan gum; 3% of sodium silicate; 6%. Low-iron cement clinker accounting for 3%-7% of the mass of the silica fume and fluorite accounting for 2%-5% of the mass of the silica fume are added into the mixture, ball milling is conducted on mixed slurry, the ball milling time is longer than 20 minutes, and uniform slurry is obtained; and spraying, drying and granulating the uniform slurry at the drying temperature of 300-350 DEG C to obtain the porous hollow additive with the bulk density of less than 1g / cm < 3 >.

Description

technical field [0001] The invention relates to the technical field of out-of-furnace refining in industrial silicon production, in particular to a method for preparing an industrial silicon refining slag agent by using microsilicon powder as a raw material. The lower micro-silicon powder is effectively utilized, and the loss caused by the oxidation of metal silicon in the silicon bag into the top slag can be reduced, and the invention belongs to the field of industrial silicon production and refining. Background technique [0002] Micro-silica fume is the dust recovered from the furnace gas dust in the production process of metal silicon. Its main component is silicon dioxide, and its weight ratio is generally more than 80%. Since the silica in the micro-silica fume comes from the oxidation of the volatilized silicon and silicon monoxide gas during smelting, the resulting silica has a high activity, a large specific surface area, and a wide range of application prospects. ...

AI Technical Summary

Problems solved by technology

Since the silicon dioxide in the slag mainly comes from the oxidation of metal silicon, it will directly reduce the yield of metal silicon

At the same time, due to the above-mentioned slagging process is long and the slagging rate is slow, it also reduces the refining efficiency

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