Method for producing strontium-silicon alloy by utilizing high-purity ferrosilicon powder

Abstract

The invention relates to the field of smelting and in particular relates to a method for producing a strontium-silicon alloy by utilizing high-purity ferrosilicon powder. The method comprises the following steps: preparing raw materials comprising high-purity silicon powder with the purity of 73-75% and metal strontium having the purity of more than 99%, wherein the total content of aluminum and calcium in the silicon powder is less than 0.05% of the total weight of the silicon powder; smelting the high-purity silicon powder, namely performing random layered feeding in an induction furnace crucible until the raw material is totally molten; adding a dreg remover, stirring, polymerizing to remove the surface residues; adding the metal strontium in blocks, and uniformly stirring; enabling thesolution to flow out of an ingot mold after mixing, clipping out when the surface is dark red, transporting to a processing workshop for crushing, screening, and packaging the finished product. Sincesmelting electricity for high-purity ferrosilicon is saved, the cost is greatly reduced. Finally, the obtained material has the components that the content of Si is equal to 72-75%, the content of Sris equal to 0.6-2.2%, the content of Al is equal to 0.1%, and the content of Ca is equal to 0.1%.

Description

technical field [0001] The invention relates to the field of smelting, in particular to a method for producing silicon-strontium alloys by utilizing high-purity ferrosilicon powder. Background technique [0002] Silicon-strontium alloy is also called strontium ferrosilicon, the main elements are Si, Sr, and the balance of Fe. It is mainly used as casting inoculant. Since Sr is the most effective element to promote inoculation in ferrosilicon inoculants, when the degree of supercooling is large, it has the special effect of reducing eutectic clusters, which can reduce shrinkage cavity and shrinkage defects of castings. . Therefore, it is often used in thin-walled or quenched high-sulfur and low-sulfur gray iron castings, ductile iron castings that need to increase the number of nodular graphite, especially suitable for corrosion-resistant cast iron and steam and water pressure gray iron castings that have strict requirements on the surface of castings. At the same time, the...

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Problems solved by technology

Therefore, the disadvantages of this process: first, the manufacturing process is complicated, takes a long time, and the operation rate is low; second, the unit consumption of electricity and materials is high, the total recovery rate of the alloy is low, and the cost is high

Oxidation refining requires the use of tundish, oxygen and its refining equipment, and the addition of an appropriate amount of refining slag. In addition to increasing the cost of equipment and auxiliary materials, the key to this method is that the alloy sticks to the bag and the amount of slag is large, resulting in a total alloy Low recovery rate

At the same time, adding oxide slag to the induction furnace will greatly scour the furnace, and the furnace life will be shortened sharply; the third is that the labor intensity of the workers is high.

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