SU644857A1 - Method of producing aluminium-silicon alloys - Google Patents

Description

(54) METHOD OF MANUFACTURE OF ALUMINUM-SILICON ALLOYS

The purpose of the invention is to improve the technical and economic indicators of the P | process and reduce metal losses.

This is achieved in that the alloying elements are introduced into the charge before the coal-thermal recovery.

In addition, copper and / or nickel are introduced as oxides and are metered into the mixture on the basis of maintaining their ratio to silicon in the alloy in the range from 0.03 to 2.0 by weight.

The introduction of additives of copper and / or nickel, an evil; leech impurities with impurities in most aluminum structural alloys, alloys, favorably influences the course of the main process of reduction by alloys: ngi and silicon, since fiz | Iko-chi1m1ichesky properties of the alloy formed in the furnace; The aluminum active and aluminum are reduced and the cream and: I, which reduces the temperature of the start of the reduction of the mixtures and decreases the losses due to the reduced aluminum

And flint; the specific gravity of the aluminum-silicon alloy also increases and becomes new. From the greater specific gravity went: coke melt, which provides a more favorable for

of the main process, the location of the slag over the alloy: conditions are created for the slabs to be completely restored, the losses due to evaporation are reduced. Aluminum and silicon are reduced, the electrical resistance of the bath with two or more electrodes is increased.

Introduced into the composition of alumina-silicon alloys in the course of the di-recovery melting of silica-alumina.

w-ichts on a single-phase electric furnace with a power of 10 kW ds Ubavo K copper in the amount of 9 and 11.5% of the weight of the alloy significantly improves the packing of the ore-recovery process. Indicators heats charge A and B,

calculated for the production of alumiiyerekremiyevye alloys containing 62 and 69% aluminum, with or without the addition of copper to the furnace, are listed in the table.

As follows from the data obtained, the introduction of an aluminum – silicon alloy at the ore-reducing melt of the silica – alumina charge of additives is about 10% of copper: It reduces the charge consumption by 15–17%, Electrodanergy, and increases by 7–18% in refined melts by 7–18%. This indicates a significant decrease in carbon, o-., And slag formation during the process of reducing the silica-alumina charge in the presence of heavy metals. A similar effect should be expected when nickel is added to the alloy in the alloy.

In order to achieve this goal in the process of obtaining aluminum-silicon alloys, it is more expedient to simultaneously add two or more alloying components to the composition of the alloys, taiKnx like copper, nvkel, manganese, and others With D01 sum, mar. ng content of heavy metals in aluminum alloys: double alloy up to 15-20%.

The content of heavy metals in alloys is determined by many factors, depending on the grade of the alloy and the technological scheme of its processing on this or another structural aluminum alloy, on the design features and parameters of the ore-thermal electric furnaces and on the composition of the slags produced in electric furnaces. . For example, in single-phase electric furnaces with a conductive bottom, the total content of heavy metal impurities in aluminum-silicon alloys can be more lowly than that of three-phase electric furnaces (me, having a common metal bath. From the composition of the slag composition to the electric furnaces , their temperature of heating and gas saturation in the bath of electric furnaces significantly depends on the proportion of both the slag itself and the strength of the alloy doped with heavy metals according to the invention.

In connection with the comparatively low chemical strength of oxides in copper and nickel as compared with oxides: aluminum and silicon, the goal of isotope retention can be achieved with the introduction of both leoperstvenno copper and nickel, and their oxides or other compounds.

According to the invention, the sequence of operations for producing an alloy from an ore-reducing furnace is practically unchanged compared with the known method. Only the addition of heavy metals is added.

The processing of the obtained primary alloy into casting and wrought aluminum alloys is carried out by known methods in accordance with the technical requirements.

Claims (3)

1. Method for the production of aluminum-silicon alloys, alloyed, for example, with copper and / or nickel, including preparation of silica-alumina charge, its coal-thermal reduction, dilution of the primary alloy of aluminum minerium and refining from impurities, characterized in that, in order to improve the technical and economic indicators of the process and reduce metal losses, the alloying elements are introduced into the mixture with uterothermic recovery. 2. Method 1PO Clause 1, which is based on the fact that copper and / or nickel are introduced in the form of oxides. 3. A method according to claim 1, characterized in that copper and / or nwkel are metered into the mixture on the basis of maintaining their ratio to silicon in the melt in the range from 0.03 to 2.0 by weight. The source of information taken into account in the examination: 1. Brusak Yu. I. et al. Pilot industrial tests of large-scale laboratory studies on the electrothermal production of alumina, silicon and silicon alloys and their processing into. Proceedings of YOU, No. 54-55, 1965, p. .