SU527476A1 - Method of setting up a multistage magneto-optical channel - Google Patents

Description

(54) REDUCING MIXTURE

one

This invention relates to the field of color and ferrous metallurgy, in particular, to the production of silicon, ferrosilicon, and silicone.

Production of silicon, ferrosilicon

Silicocalcium is based on the reduction of metal oxides by carbon in electric furnaces.

Metallurgical coke, semi-coke, charcoal and hard coal, non-coke, lignip, shungite, etc. are used as carbonaceous reducing agents.

In order to improve technical and economic indicators, use of graphitization wastes (graphitized grit) containing up to 25-30 o silicon carbide,

The following mixtures of reducing agents are currently known.

When producing FS-45 ferrosilicon, 45 kg of carborund obese waste (with 28% life) and 445 kg of coke are consumed.

The composition of the reducing mixture: 2.6% silicon carbide, the rest (97.4%) carbon material l.

In the production of silica chromium, 53 kg of coke, 60 kg of semi-coke and 60 kg of graphitization waste (with 2O% b-fc), 300 kg of quartzite and 132 kg of ferorochrome j2 were added to the colosha.

According to the instructions, the reducing mixture contains: 6.9% silicon carbide "93.1% carbonaceous materials.

The most famous is the restoration of a 1m blend containing 1-30% silicon carbide, 1-ZO% carbonaceous materials; the rest of the peat Sz.

This mixture has advantages over the well-known mixtures, since it has a higher electrical resistivity and porosity. However, these primids can be realized only in the smelting of those alloys of silicon j, at the end of which, metal additives are introduced into the charge, for example, in the smelting of ferro-SiF-18, 45, 75 and silnecochrome.

In those cases when metal additives are not introduced into the mixture, for example, upon receipt of silicon,; silnokokaldi, ferrosilicon ma CL FS-.90, the use of the known reducing mixture of irfrissoAHT to reduce the production of furnaces, especially when MBHIW is small (≤2%) in its silicon carbide and carbonaceous materials. PRINCIPLE the furnace skizhaechg ie-ea is not aaaaaaa zatosheny volume of the working space of the furnace.

The chain of inventions is as follows (so that when using a reduction mixture containing peat, silicon carbide and carbonaceous material (reducing agent), to increase the productivity of the furnace.

For this, it is proposed to n {№1mvn t reduction mixture containing car. Bida of silicon, carbonaceous restorations, the rest is peat. The reducing agent to the mixture may be grained (briquetted) after serving in the oven. Serve the proposed mixture in the oven can be together or separately with the recovered oxides. The recovery mixture without addition to the furnace ensures that the metal additive provides a stable po1: :: electrode ratio and charge mix as a result of the storage of constancy; of the charge.

The stability of the electrosogram (the change is 110%) is achieved by varying the composition of the mixture within the specified limits. Gtri increase soda & rscan in a mixture of silicon carbide more. 30% and carbonaceous reducing agents less than 6O% increase; electric motivation of the mixture is more than 10% JLO, especially at temperatures above 1300

In this case, the electrodes are lowered to the bottom and reduce the convergence of the charge, and, as a result, reduce the productivity of the furnace.

In the case when the carbonaceous ones restore the mixture in the mixture is more than 90%, and silicon carbide is less than 1%, the electrical resistance of the mixture decreases significantly. Ie because of this, the electrodes rise up, which in turn leads to a decrease in the temperatures of the working space and the productivity of the furnace.

Claims (3)

1M. A. Ryss Production of ferroalloys, M. 19c «, p. 198. 2. Technological instructions TI-02-72, Serov, 1972. 3. Author's certificate No. 451765, cl. From 21 to 7/00, 1973