SU1067069A1 - Method for depleting slags of aluminium production - Google Patents

Abstract

METHOD FOR LITERATING ALUMINUM MANUFACTURING PLAINS, including the introduction of potassium chloride based flux into the layer of the donkey, mixing the slag with the flux, settling and removing the slag from the surface of the molten metal, in order to reduce the metal loss from the waste slag, the mixture is used as a flux. consisting of sawdust and potassium chloride in a ratio of 1:

Description

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The invention relates to non-ferrous metallurgy, in particular, to processes for the depletion of slags from aluminum production, and can be used in the production of aluminum alloys from secondary raw materials.

There is a known method of derating donkeys consisting of slag processing with a spherical refractory plug, of a melt, on the slag-metal 1 interface.

The disadvantage of this method is the incomplete separation of the metal from the slag.

There is also known a method for the removal of slags from slags, which consists in introducing into it boiler slag, bilamot and flux in a ratio of 1: 2: 2 in an amount of 80-120 kg per ton of slag 2.

This method is characterized by the entrainment of metal with injected constituents.

Closest to the invention is a method for extracting aluminum from aluminum production drosses, consisting in introducing into the melt a flux of the composition, wt.%: Potassium chloride 45; sodium chloride 50; cryolite 5. The weld metal bath is stirred, flux in an amount up to 50% is added, mixed, slags are removed. Metal recovery is 93.5-94% Gz.

The disadvantages of the known method include incomplete separation at the slag – metal interface, relatively large losses (up to 6.5%) of metal from slags, high flux consumption (up to 50%) by weight of the metal.

The aim of the invention is to reduce the loss of metal from waste slag.

This goal is achieved by the fact that according to the method of extracting aluminum from aluminum slag production, including introducing flux into the slag layer. based on potassium chloride, mixing slag with flux, settling and removing slag from the surface of the molten metal, as a flux, use a mixture consisting of sawdust and potassium chloride in a ratio of 1: (1-1.2) in an amount of 3-5% from the mass of slag formed.

The essence of the method is as follows.

The slag above the molten metal is mixed thoroughly for 3-5 minutes. The flux of potassium chloride and sawdust fractions of 0.5-4 mm in an amount of 3-5% by weight is poured onto the slag surface in uniform portions (over the slag mirror).

slag. The slag and the injected flux are mixed for 5-10 minutes, after which it is settled and the remaining slag is mechanically removed, while the wood is mixed, the sawdust combusts, the temperature in the slag layer rises, and the slag liquefies and coagulates. slag and return it to the metal bath. The aluminum-depleted dry slag is removed by metal scraper into the molds.

Example 1. After the mixing of aluminum production slag, after mixing for 5 minutes, 50 g of a mixture consisting of 25 g of potassium chloride and 25 g of sawdust are introduced. Fractional composition of the mixture 0.5-4 mm. Combine for 5 minutes and remove slag. The metal content in the slag dump 3%. Slag is a loose mass.

Example 2. Under the conditions of example 1, the slag is treated with a mixture of 23 g of potassium chloride and 27 g of sawdust for 5 minutes. The residual metal content in the slag is 3%.

Example. 3. Under the conditions of Example 2., the slag is treated with a mixture consisting of 15 g of potassium chloride and 15 g of sawdust for 10 minutes. Fractional composition of the mixture 0.5-4 mm. Stir for 10 minutes. The residual metal content in the slag is 4.8%.

EXAMPLE 4 Under conditions of 3, slag is treated with a mixture of 20 g of CHLORINE KALIUM and 20 g of sawdust. The aluminum content in the slag dump is 3.5%.

Example5. Under the conditions of Example 4, the lacquer is treated with a mixture consisting of 18 g of potassium chloride and 22 g of sawdust. The residual metal content in the slag is 3.8%.

The proposed slag depletion method has a number of technical advantages over the prototype.

Thus, the introduction of sawdust into the composition of the flux provides a local temperature increase in the slag layer, which is the reason for the coagulation of corols and aluminum. Due to depletion, the treated shpak becomes dry and is easily removable, while in the prototype the slag is thick fat. The metal content in the slag after depletion of the proposed method is 3-4.8% (compared to 6.5% of the prototype).

The expected economic effect from the use of the proposed technical solution in comparison with the base 31067069

The target object, of which non-ferrous metals are used, is a flux for aluminum processing - 120 thousand rubles. per year with the volume of proyeal alloys of the Mtzeisky secondary plant 40.000 tons per year.

Claims (1)

METHOD OF ALUMINUM PRODUCTION SLAG DECOMPOSITION, including introducing a flux based on potassium chloride into a slag layer, mixing slag with a flux, settling and removing slag from the surface of the molten metal, characterized in that, in order to reduce metal loss with dump slag, they are used as a flux a mixture of sawdust and potassium chloride in a ratio of 1: (1-1.2), in an amount of 3-5% by weight of the resulting slag.