SU1067071A1 - Flux for treating aluminium alloys - Google Patents

Description

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The invention relates to non-ferrous metallurgy, in particular, fluxes for the treatment of aluminum alloys, and can be used for the refining of aluminum alloys from magnesium.

A known flux for the recovery of magnesium from an aluminum alloy, consisting of a double salt of potassium fluoride, aluminum fluoride f1J.

However, this flux is characterized by insufficient refining of machined aluminum alloys from magnesium.

Flux is also known for non-ferrous metal processing, consisting of 65-95% borax and 5-35% soda 2J.

However, the substance is characterized by insufficient refining ability. The residual magnesium content in the alloy is more than 0.4%.

The closest is the flux for treating aluminum alloys containing silica (100 wt.%). This flux is used in the following manner, part of the silica is introduced into the molten metal to form a suspension and suspended solids, then the silica is again added with stirring. The flux interacts with the aluminum alloy to form silicon and aluminum oxide and magnesium, which are removed from the melt surface with flux chloride f3j.

The disadvantages of this substance are the duration of the process of mastering silicon (3-4 hours) and the relatively high content of alumina in the alloy (up to 0.34%).

The purpose of the invention is to reduce the refining time while reducing the alumina content in the alloys being processed.

The goal is achieved by the fact that the flux for treating aluminum cn / iaBOB, containing silica, additionally contains borax and sodium carbonate in the following ratio of ingredients, wt.%: Bura10-20

Carbonated sodium 10-30 Silica Ostal

The proposed flux for treating aluminum alloys is obtained simply by mechanical agitation under normal conditions — and in typical process equipment, the preferred fractional composition of fluke is 1-3 mm, and the humidity is no more than 5%. Silica (60-70 wt.%), Borax (10-20 wt.%) According to GOST 8429-77, sodium carbonate (10-30 wt.%) In accordance with GOST 5100-73 are used to prepare the flux.

The resulting substance is characterized by the following properties: the bulk mass of the fraction is 1-3 mm, the humidity is not more than 5%. In a graphite-chamotte crucible, an aluminum alloy melt is heated to 35-5 ° C above the liquidus of this alloy. The proposed flux is introduced into this melt in an amount corresponding to the ratio Magnesium: Flux 1: (4-8). The melt is mixed with the flux for 20-30 minutes, after which it is defended for 5-10 minutes and poured into the mold.

The table shows the chemical composition of specific examples of the proposed substance and prototype and properties.

The expected annual savings from using the proposed flux at a maximum volume of 500 tons per year is 125 thousand rubles.

10 15 20

60

65

70

100

Prototype

1.05 5.5 0.15 7.7

30 20 10 1.05 5.2 0.36 7.5 1.37 5.5 0.28 8.9

7.0

1.37

0.42

5.5

Society

Proposed 1 2 3

Prototype

Table continuation

Content

Duration

 % processing, h

0.08

0.15 0.10

0.34

Claims (1)

FLUX FOR PROCESSING ALUMINUM ALLOYS containing silica, characterized in that, in order to reduce the refining duration while reducing the aluminum oxide content in the processed alloys, the flux additionally contains borax and sodium carbonate in the following ratio of ingredients, May.%: Borax 10-20 Sodium carbonate 10-30 Silica Rest