Metallurgical Product Description

A white solid substance separated after the desalinization operation is called silicon slag. Because it contains alumina and alkali, it is usually added back when preparing raw ingredients.Silicon slag is a mixture containing mainly 40% to 90% silicon and is a by-product of metallic silicon. It is a good substitute for ferrosilicon in steelmaking and has the advantage of reducing costs.

Product Parameters

Product Advantages

Silicon slag has inherent advantages over ordinary ferroalloy products. Its ex-factory price is low but its deoxidation effect is very good. It can be effectively used by manufacturers to replace relatively expensive products such as ferrosilicon and metallic silicon. The use of silicon slag can effectively reduce the manufacturer’s production costs, shorten the deoxidation time, and improve the efficiency of steelmaking. The use of silicon slag during steelmaking can increase the furnace temperature and increase the recovery rate of steelmaking.

Silicon slag separation

In alumina production, after the crude liquid has been desiliconized, the solution contains a large amount of impurities such as silicon slag and red mud, and cannot be decomposed directly. To make the product alumina meet the standards stipulated by the country, the crude liquid must be clarified and separated after desilication to produce a pure and transparent sodium aluminate solution. When processing the desiliconized solution, leaf filters or filter presses are commonly used in industry to separate the silicon residue in the desiliconized solution. The task of the silicon slag separation process is to separate the de-silicon slurry sent from the desalinization process to obtain sodium aluminate semen with a desalinization index, iron-aluminum ratio, and floating matter content that meets the process requirements, and then send the semen to carbonic acid decomposition. The quality of semen is the key to ensuring the quality of the final product, alumina.

Applications

1. Silicon slag can be used as a substitute for metallic silicon.
2. The silicon addition amount for blast furnaces and cupola furnaces is 30% to 50%, and the deoxidized silicon addition amount for steelmaking is 50% to 70%.
3. Silicon balls produced from silicon slag have broad application prospects in foreign markets.
4. Silicon slag is a good substitute for ferrosilicon in steelmaking and has the advantage of reducing production costs.