RU1792998C - Charge for ferrosilicoaluminium smelting - Google Patents

Abstract

Application: in ferrous metallurgy. SUMMARY OF THE INVENTION: A mixture contains, as a silicon-containing material, tailings for the production of copper concentrate 30-50%; 45-55% as a reducing agent, as well as aluminum and iron-containing material, screenings for the preparation of secondary aluminum raw materials; and additionally, as a fluxing additive, as well as calcium and magnesium-containing material, the screening of calcined dolomite is 5-15%. 2 tab.

Description

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The invention relates to ferrous metal. namely, the electrometallurgy of ferroslags.

An object of the invention is to expand the raw material base of production and reduce the cost of the resulting alloy.

The proposed charge for smelting ferosilicoaluminium contains tailings npot of copper concentrate, screenings for preheating of secondary aluminum cheese and screenings of calcined dolomite in the following ratio, wt.%:

(production east

ice concentrate 30-50

Training season

psoric aluminum raw material 45-55

Ztsevy burnt

shlomita 5-15

Several compounds were prepared, from which ferrosilicon aluminum was smelted. The chemical compositions of the charge materials are given below.

Tails of the production of copper concentrate, wt.%: SI02 70-75; Al3O3 3.30; CaO 3.50; MdO 2.80; FeO 2.90; S 3.10; oxides and other elemental

Tails for the production of copper concentrate do not have GOST; OST and TU are a waste product.

Screenings for the preparation of secondary aluminum raw materials:

and). Screening of aluminum chips (TU 48-26-52-82), wt.%: AI 40-55; Si 5.60; Mg 0.35; Zn 1.90; -Mn 0.26; Fe 14-15; oxides of Fe, AI, and other elements the rest.

b) Screening waste of secondary aluminum raw materials, wt.%: AI25-30; Si 6.20; Mg 0.20; Zn 0.80; Ml 0.87; Mn 0.615; Fe 15-18; oxides AI, Fe and other elem, the rest.

Metallurgical yield 25-30%; grade content (-0.1) 15-20%; grade of aluminum metal .0.1 mm

ate with

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30-35%; screening waste of secondary aluminum raw materials does not meet TU 48-26-52- 82 and is substandard waste. ; : .-:., -. : ;; - ;:. -. ./,. . -. Screening of calcined dolomite, wt.%: SI02 2.00; 2.00; Rv20z 0.30; MdO 36.00; Ca055.00; H20 2.00; COa 2.50.

Dolomite is fired in a drum oven; with; after firing, they disperse, a fraction of more than 3 mm is used in metallurgical industries, and less than 3 mm is a screening of calcined dolomite and does not have TU.

The compositions of the proposed and known mixture are given in table. 1 and 2.: A mixed finished batch with a metering device is loaded into a crucible of a multi-furnace with a capacity of 270 kg, where ferro-silicoaluminium is melted. The whole heat lasts 20-25 minutes. The alloy and slag from the inductor of the induction electric furnace are poured into cast-iron non-fused molds. After cooling, the metal and slag are ejected from the mold. The metal is separated from the slag without additional machining. The chemical compositions of the alloy obtained from the proposed shihTvvyh materials are given in .. table.2. .-:,:..: rJ:;:;: -.- {i: /; : ./ vV When the content of the tailings of the production of copper concentrate is higher than 50%, for example 50.50%, the formation process worsens, the melting time and the energy consumption increase.

 which negatively affects the cost of the resulting alloy.

The content of the claimed charge in the production of copper concentrate is less than 30%, for example, 29.5%. It leads to a decrease in the degree of extraction of silicon, a rapid reaction, accompanied by large emissions of the charge, which leads to an increase in yield by 1.5 %

The elimination of the preparation of secondary aluminum raw materials of more than 55%, for example 55.5%, leads to an unnecessarily violent reaction with large emissions of the charge from the crucible, which reduces the extraction of elements in the alloy and the excessive consumption of aluminum.

When the secondary aluminum feed preparation is below 45%, for example 44.5%, in the batch, the smelting is not provided with sufficient heat, which leads to additional energy consumption and an increase in the duration of smelting.

If the burden of burnt dolomite in the screening mixture is higher than 15%, for example 16%, the viscosity of the slag-metal melt increases, the slag gradually turns into a heterogeneous state, a significant amount of metal (5%) is lost in the slag, and after the mold is disintegrated, the metal and ; partially

is difficult.

When the content of burnt dolomite in the screening charge is below 5%, for example 4%, Slag is formed by reduced activity and does not provide for the removal of harmful

impurities. ; : An analysis of the test results showed that for the smelting of ferro-silicoaluminium it is possible to use the above materials as charge materials, which are a waste of the corresponding industries. The use of such waste expands the raw material base for the production of ferroalloys, which leads to a reduction in the cost of the alloy,

Claims (1)

SUMMARY OF THE INVENTION A mixture for smelting ferro-silicoaluminium T containing a silicon-containing material and a reducing agent is used to expand the raw material base of production and to reduce self-. CToMMOctn according to the NuzhShogsi alloy, contains silicon tails for the production of copper concentrate as a silicon-containing material, and screenings for the preparation of secondary aluminum raw materials as a reducing agent and, in addition, fluxing screenings for calcined dolomite in the following ratio, wt.%: Production tails copper concentrate 30-50 Screening training secondary aluminum raw materials 45-55 Screenings of burnt dolomite 5-15 Ta 6l and tsa 1 Tables 2