The method of extraction of metal from slag

 

(57) Abstract:

Usage: the invention relates to ferrous metallurgy, in particular to a method of processing slag extraction of the bound metal, and may be used in secondary metallurgy. Essence: before pressure treatment of metals slag is heated to 700-800C and subjected to a loading force of 0.5-6.0 kg/cm2in conditions ensuring the expiration of the squeezed metal salt components of the slag. The invention provides an increase in the yield of recoverable metal and the degree of its purity. table 1.

The invention relates to ferrous metallurgy, in particular to a method of processing slag to remove the associated metal, and can be used in secondary metallurgy.

There is a method of extraction of metals from slag, including the processing of slag in the pressure and separating the metal from the slag [1].

The disadvantage of this method is the low yield of metal and contamination of aluminum metal inclusions salt components.

The closest technical solution is the method of extraction of liquid aluminium during pressing of toxins, including the processing of the

The disadvantage of this method is not a high yield of recoverable metal from the slag.

The objective of the proposed method is to increase the yield of recoverable metal and the degree of its purity.

This object is achieved in that before processing the slag is heated to a temperature of 700-800oC and subjected 2-5 the loading force of 0.5-6 kg/cm2in conditions ensuring the expiration of the squeezed metal salt components of the slag.

Heating of the slag to a temperature of 700-800oC provides the melting of the metal components of the slag and good fluidity.

When the heating temperature below 700oC decreases the fluidity of the metal parts furnace slag and as a consequence is not provided them free after that reduces the extraction of metal from the slag.

Heating above 800oC leads to burnout and intensive oxidation of the metal components of the slag and the reducing metal recovery from slag.

2-5 loading force of 0.5-6 kg/cm2are the best and provide you with the period of maximum discharge end of the metal salt components of the slag, contributing to a more complete extraction of the metal.

The increase in the number of cycles over 5 and a pressure of more than 6 kg/cm2is not economically feasible, since the additional amount of metal from slag practically does not occur.

An example of the proposed method

As an example, was used slag aluminum content of 50%. The slag in the amount of 50 kg load in a hot container and heated to a temperature of 700-850oC in an electric resistance furnace with a roll-out hearth. After heating the container mounted on the vertical hydraulic process, where the slag is subjected to the pressure treatment. The pressure in the processing is 0.3-7 kg/cm2the number of loading 1-6.

When removing metal by a known method hot slag at a temperature of 750oC load in the matrix and the lower punch.

Obtained after processing the metal of the proposed method and the prototype weighed to determine the amount of recoverable metal from the slag.

The processing parameters and the main results of the conducted research are given in the table.

Comparison of values of metal recovery allows us to conclude that manual. The percentage of recoverable metal is increased by 23-35%.

The method of extraction of metals from slag, mainly aluminum and aluminum alloys, including the processing of slag in the pressure and separating the metal from the slag, wherein before processing the slag is heated to 700 - 800oC and subjected to 2 - 5 loading force of 0.5 - 6.0 kg/cm2in conditions ensuring the expiration of the squeezed metal salt components of the slag.

 

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FIELD: non-iron metallurgy, in particular reprocessing of aluminum waste.

SUBSTANCE: claimed method includes junk charge into premelted flux at ratio of 1:(5-10); heating up to melt temperature; smelting under flux layer, and separation of metal from flux. Equimolar mixture of sodium chloride and potassium chloride with addition of 2.9-52.6 % (in respect to total flux weight) magnesium fluoride is used as flux, and in melting process flux layer with thickness of 4.5-20 cm is maintained. Method affords the ability to conserve original composition and eliminate additional burdening with magnesium.

EFFECT: decreased burn-off loss, especially for magnesium, metal of improved quality.

4 cl, 3 tbl, 5 ex

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