SU444815A1 - Method for producing low carbon ferrochrome - Google Patents

Description

one

This invention relates to the manufacture of ferroalloy 5U. A known method for producing low-carbon ferrochram includes the process in two stages, in the first of which the limit ferrochrome is used in the electric furnace by the method, and in the second the resulting pa. 5 The melt is blown, for example in an oxygen converter.

However, even with the subsequent evacuation of the melt, it is possible to REDUCE the content of carbon 10 in ferrochrome only to 0.4 / &. At the same time, as a result of the blowdown, more chromium is lost,

The purpose of the invention is to reduce the carbon content of low carbon ferrochrome and reduce chromium loss.

A distinctive feature of the proposed method is that, at the first stage, the process is carried out with obtaining in the limiting ferrochrome silicon content in

limits, and on the second together with oxygen, powdered lime is blown into the melt. In an electric furnace, the carbon furnace g ;.

The 5% reduction of chromium ore and quartzite is obtained by limiting ferrochrome, at the same time due to the introduction of a certain amount of quartzite into the mine

0 by using poor chrome ore and the corresponding smelting mode, the silicon content in the limit ferrochrome is adjusted to 4-15. ...

5 The resulting conversion ferrochrome is poured into the converter and is purged with oxygen while simultaneously supplying powdered lime to the melt.

0, Deeper decarburized. - The friction of ferrochrome is due to the fact that as a result of silicon oxide, when silicon is purged with oxygen, favorable conditions are created for the endothermic oxidation of carbon. Blowing lime binds the resulting silica. thanks to what refining of ferrochrome, from silicon, is achieved

If necessary, for the purpose of deeper decarburization of ferrochrome, the melt can be evacuated after purging and its oxygen.

Vacuuming is carried out either under an oxidizing slag or with oxygen supplied to the surface of the melt, depending on the composition of the metal and the temperature conditions. Upon receipt of nitrated low-carbon ferrochrome, the metal is maintained under a nitrogen atmosphere after evacuation.

SUBJECT OF INVENTION

A method of using low-carbon ferrochrome, which involves carrying out the process in two days, for pigments from which in the electric furnace, the ferrochrome is reduced by the thermal method, and for the second melt, the resulting melt is blown into the converter with oxygen, characterized in that, in order to reduce the carbon content, it is used for heating, carbon, and the resulting melt is blown into the furnace with oxygen, which is used in order to reduce the carbon content, and to use the hearth and carbon, and to reduce the carbon content and hearth and carbon, and the resulting melt is blown into the converter with oxygen, characterized in that, in order to reduce the carbon content, it is used to clean the carbon and to use the mangie and hearth. , at the first stage, the process is carried out with obtaining in the limit ferrochrome silicon content in the range of 4-15 / S, and in the second, powdered lime is blown into the melt together with oxygen.