SU481650A1 - Ferrosilicoaluminium smelting mine - Google Patents

Description

one

The invention relates to the field of ferrous metallurgy, namely to electrometallurgy of ferro-alloys.

The process of producing ferrosilico-aluminum by the electrothermal method is carried out in typical ore-reducing furnaces, where as alumina-containing materials HcnojibsyroT are bauxite, kaolin, electrolysis production waste.

A known mineral for smelting ferrosilico-aluminum, consisting of quartzite and iron chips.

However, the known charge in the alumina-containing material has the total content of harmful impurities — sulfur, phosphorus, etc .; high content of flux components - CaO, MDO, TL- O, and others; the presence of moisture, mostly hydrated, up to 2040%; scarce and high cost of bauxite and reducing agents, as well as the use of labor-intensive operations (calcination, fine grinding and agglomeration) in the preparation of scraps.

The purpose of the invention is to develop the composition of the charge for the ferro-silicon-aluminum lining,

which would reduce the amount of harmful impurities would reduce. consumption of scarce reducing agents and electricity, and would also provide an opportunity to expand the ore alumina-containing base.

This is achieved by combining quartzite and iron shavings for ferro-silicon-aluminum catcher, which additionally introduces coal dumps, and the components of the charge are taken in the following ratios. %:

16-30 6-20

.4-20 о44-60

The selected ratio of components of the product provides ferrosilicoaluminium content, weight. %:

Si45-55

A18-15 Impurities Ca, M i Else. Dump rocks of coal according to the existing technological scheme, adopted, for example, at the Ekibastuzugol combine, rocks with ash content of more than 45% are sent to the dump. The analysis found that rocks contain an average of 3-5% moisture, 12-15% non-volatile carbon and 45-73% ash. Below is the chemical composition of rocks, which fluctuates within the following limits,%: 5О-62 0,8-1,1 The distinctive feature of abbreviated coal dumps is high ash content (more than 45%) and high total content of useful oxides in the ashes. (SiO and A1 "O); resilience of the fraction to the high temperature zone during electrofusion (commencement of deformation 1400-158 ° C, commencement of softening 16OO1680 ° C, transition to liquid state 1680-170 ° C); low content of other components (M fl O, CaO), which prevents the formation of low-melting slags in the upper horizons of the furnace; the relatively low content of phosphorus and sulfur, the latter is predominantly in the organo-. comical form and is easily removed (evaporated) during electric smelting (120 ° -1300 ° C); low humidity (3-5%); carbon in rocks (12–15%) participates in oxide reduction processes, thanks to which the consumption of the reducing agent is reduced; the rock is in a lumpy fractional composition. The subject matter of the invention The mixture for the smelting of ferrosilico-aluminum, containing quartzite, coking and metal components, is necessary so that, in order to reduce the consumption of reducing agents and electricity, as well as to expand the ore alumina-containing base, The coal dumps were introduced at the next component ratio, weight. %: Quartzite 16-30 Coxic6-20 Metal content 4-20 Mouldstone coal 44-60