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Silicon Slag Steelmaking Industry
- Jul 01, 2017 -

Silicon Slag Steelmaking industry

(1) Used as a deoxidizer and a gold alloy in the steelmaking industry. In order to obtain chemical composition of qualified steel and to ensure the quality of steel, in the final stage of steelmaking must be deoxidized, silicon and oxygen between the chemical affinity is large, so ferrosilicon is a strong steel oxide for precipitation and diffusion deoxidation. In the steel to add a certain amount of silicon, can significantly improve the strength of steel, hardness and flexibility, and thus in the smelting structural steel (silicon 0.40-1.75%), tool steel (containing SiO.30-1.8%), spring steel Containing SiO00-2-8%) and silicon steel for transformers (2.81-4.8% silicon), ferrosilicon is also used as a gold alloy.

In addition, in the steelmaking industry, the use of ferrosilicon powder at high temperatures, can produce a lot of heat burning, this is often used as a steel ingot heating agent to improve the quality and recovery of ingots.

(2) Used as inoculants and nodulizers in the cast iron industry. Cast iron is an important metal in modern industry, it is cheaper than steel, easy to melt smelting, with excellent casting performance and much better than the steel seismic capacity. Especially ductile iron, its mechanical properties meet or close to the mechanical properties of steel. The addition of a certain amount of ferrosilicon in the cast iron can prevent the formation of carbides in the iron and promote the precipitation and spheroidization of the graphite. Thus, in the production of ductile iron, ferrosilicon is an important inoculant (to help the precipitation of graphite) and spheroidization

(3) ferrous alloy production as a reducing agent. Not only the chemical affinity between silicon and oxygen is very large, and the silicon content of high silicon ferrosilicon is very low. Therefore, high silicon ferrosilicon (or siliceous alloy) is a ferroalloy industry in the production of low carbon ferroalloy is more commonly used as a reducing agent.

(4) 75 # ferrosilicon in the Piejiang method of magnesium commonly used in the process of high temperature metal smelting, CaO.MgO in the magnesium replaced, the production of one ton of metal magnesium will consume about 1.2 tons of ferrosilicon, Magnesium metal production plays a significant role.

(5) the use of other aspects. The finely divided or atomized ferrosilicon powder can be used as a suspension phase in the beneficiation industry. In the electrode manufacturing industry can be used as electrode coating. High silicon ferrosilicon in the chemical industry can be used to manufacture silicone and other products.

In these applications, the steelmaking, foundry and ferroalloy industries are the largest users of ferrosilicon. They consume about 90% more ferrosilicon. Among the various grades of ferrosilicon, the most widely used is 75% ferrosilicon. In the steel industry, each production of 1t steel consumption of about 3-5kg75% ferrosilicon.

Ferrosilicon main 1501 contract on the 22th reported at 5736 yuan / ton, the closing price reported at 5716 yuan / ton, down 0.45 percent, the day a total turnover of 27818 hands. Manganese silicon main 1501 contract on the 22th reported at 6366 yuan / ton, closing at 6392 yuan / ton, or 0.19%, a total turnover of 12830 hands all day.

 Industry News, the first 7 months of this year, domestic crude steel Nissan are more than 2.2 million tons, according to this level, is expected this year, crude steel production reached 830 million tons. According to the latest statistics of China Iron and Steel Industry Association, from January to July, the national pig iron production 422 million tons, an increase of 0.4%; crude steel output 481 million tons, an increase of 2.7%. Iron and steel production grew slightly year on year, slowing growth year on year. From January to July, the average daily output of crude steel was 2.2677 million tons, of which the daily Nissan level was above 2.2 million tons and the output remained high. June crude steel Nissan up to 230.97 million tons, the first time exceeded 2.3 million tons.