SU618437A1 - Charge for melting ferrosilicium - Google Patents

Description

(54) CHARGE FOR MELTING FERROSILITION

one

The invention relates to the field of ferrous metallurgy, in particular to the production of ferrosilicon.

Known charge for the production of fairways. %:

statements containing

Quartzite

62.5-64.0

Carbon Wax 29-30 Becomer 7.0-7.5 ij.

Iron shavings

The disadvantage of this mixture is the impossibility of obtaining from it ferrosilicon with a low (less than 1%) aluminum content. This is due to its reduction from oxides contained in quartzite and a reducing agent in the transition to the metal.

In the production of transformer steel, it is possible to use ferroswitches with an aluminum content of less than 1% O.

Since the aluminum content in. ferrosilicon exceeds 1.5%; stavovitl with the necessary additional surgery to remove it, which, as a rule, is associated with metal loss.

The purpose of the invention is to reduce the aluminum content in the alloy obtained in the ore-smelting furnace.

The goal is achieved by the fact that the mixture additionally contains pyrite in the following ratio of components, weight,%:

Quartzite4O, 0-7O, O

Carbon reducing15,0-45,0

Pyrite 2.0-4O, O

Iron shavings Else

In the process of smelting the charge, the recoverable aluminum forms thermally durable compounds of aluminum sulphides with sulfur pyrite, which convert from metal to slag, resulting in a decrease in the content of aluminum in the alloy.

Claims (1)

Studies have shown that a decrease in aluminum is already noted when pyrite is added to the mixture and amounts of 2% by weight of the mixture. The removal efficiency of aluminum increases with increasing, the proportion of pyrite in the mixture. However, this decreases the content, and the silicon content in the alloy. Therefore, the upper limit of the pyrite content in the fcocrase charge is 40%. . Example. Smelting of ferrosilicon is carried out using ordinary mixtures in the charge. The proposed composition of the shwhcht provides obtaining of ferrosilicon with an aluminum content less than 1.0% inconsistently in the furnace without performing additional operations on its own. and iron shavings, characterized in that, with a view. iron-containing materials (iron scrap) and pyrite with an iron content of 36%. Melting are continuous npoi process in an open semi-industrial ore-thermal furnace with a capacity of 1200 kVA. Tshavok results are given below. reducing the aluminum content in the alloy, it additionally contains pyrite in the following ratio of components, wt.%: Quartzite 40-70 Carbonaceous reducing agent 15-45 Pyrite 2-40 Iron chips The rest. Sources of information taken into account in the examination: 1. Ryss M, A, Production of ferro-alloys, Moscow, Moscow, 1975, p. 50.