Method for reprocessing of lead cakes

FIELD: non-iron metallurgy, in particular reprocessing of lead cakes from zinc manufacturing.

SUBSTANCE: claimed method includes heat treatment of lead cake with flux followed by smelting wherein before heat treatment mixture of lead cake, calcium hydroxide, and clinker from lead cake milling is balled to produce pellets. Pellets have fineness preferably of 30-100 mm. Method of present invention affords the ability to increase total coefficient of lead recovery by 3.1 %.

EFFECT: decreased energy consumption and reduced dust content in exhaust gas.

2 cl, 1 tbl

 

The invention relates to the field of non-ferrous metallurgy, in particular to the processing of lead Chekov zinc production.

A method of refining lead Chekov zinc production by feeding them on agglomeration in charge with lead concentrates and flux with further melting of sinter in blast furnace producing crude lead (Vasilev, Evergetis. Metallurgy of lead and zinc. M.: Metallurgiya, 1985).

The disadvantages of this method are the low extraction of lead in crude metal is 75% and the limit dose of lead Chekov in charge agglomeration (not more than 3-5%) due to deterioration in the quality of sinter.

A method of refining lead Chekov zinc production, including heat treatment with iron flux and subsequent electroplasma producing crude lead, matte and slag (see the patent of Russia №2150520 on CL With 22 In 7/00, 13/00, publ bull. No. 16 from 10.06.2000,).

The disadvantage of this method is the low extraction of lead in crude metal and a large download as a flux of iron ore, which increases the cost of implementing the technology.

The closest in technical essence and the achieved result is a method of processing lead Chekov, including heat treatment with the residue from the leaching of roasted flotation concentrate in soo is wearing a lead cake to the residue, equal to 1:(0.1 to 0.3) (see the patent of Russia №2186133 on CL With 22 In 7/00, 13/00, publ. Bull. No. 21 from 27.07.2002,).

The disadvantage of this method is the limitation on processing of lead oxide in shaft furnaces, in which you must file an agglomerate particle size of not less than 30 mm, high energy costs and low total recovery black lead from a lead cake especially at the stage of heat treatment due to the high Pilipinas.

Technical result achieved in the implementation of the invention is to improve melting by obtaining agglomerated pellets of lead oxide zinc production size of more than 30 mm with high strength and reaction properties.

The technical result is achieved in that a method of refining lead Chekov zinc production, which includes heat treatment lead cake with flux and subsequent melting, according to the invention additionally includes a step okutyvaya mixture of lead oxide, lime and clinker from wellawaya zinc Chekov followed by heat treatment and melting of the pellets, and other honors according to the invention is that the heat treatment serves pellets particle size of 30-100 mm, prepared from the mixture in the following ratio of components in it, wt.%:

lead cake zinc is the first production 85-90

quicklime 3-5

clinker from wellawaya zinc Chekov 5-10

The proposed method is tested in ukrupnennom-laboratory conditions. Tests showed that the flow through the heat treatment of the pellets prepared from a mixture of lead oxide and zinc production, lime and clinker from wellawaya zinc Chekov particle size of 30-100 mm with a ratio in the mixture of components, wt.%:

lead cake 85-90

quicklime 3-5

clinker 5-10

allows for melting lead cakes in mine, and electric furnaces with high technical and economic indicators: removing lead and reduced production costs.

Validation of the method is as follows.

Lead cake zinc production, filtered on a filter press composition, wt.%: lead, zinc 5-13, copper 2-10, iron 1-5, humidity 20-22% was mixed with anhydrous powdered lime (fraction minus 0.1 mm 95%) and clinker from wellawaya zinc Chekov, %: zinc 1,2, lead to 0.35, iron 37,0, silica 16,0, calcium oxide and 3.5 in the next sicovam composition (-1 mm - 5.4%and-1-10 - 56%, +10 mm - 38,6%) in a two-blade mixer and dosaged the mixture on the plate granulator with a diameter of 0.5 m, the Process of granulation regulate the flow of water from nozzles, providing a yield of pellets from 30 to 100 mm, about 100%. The prepared pellets the loaded is whether in a laboratory tubular rotary furnace with a diameter of 0.3 m and 2 m in length and conducted heat treatment of the pellets at a temperature of 800° C for 1.5 hours. The melting was conducted on a scaled-up laboratory furnace with a diameter of 0.2 m at a temperature of 1250°C for 2-3 hours. Before the end of the melt in the melt was introduced about 2% by weight of Corsica, then the melt was poured into molds and shared the slag, matte and rough lead.

The table lists the variants of the method of processing lead Chekov zinc production.

As can be seen from the table, when using the proposed method increases the total extraction of lead, including the stage of heat treatment and melting, crude metal by 3.1%, to reduce the total energy consumption more than 3 times, reduces the dust content of exhaust gases in the processes of heat treatment and melting, you can use less energy-intensive smelting furnace units.

MethodThe composition of the mixture, %The material allocated to thermal processingThe material sent for smeltingTotal recovery of lead in draft the lead, including the stage of heat treatment and melting %Energy consumption per 1 ton of lead cake kW·h/t
 Lead cakeHigh-calcium limestone is e ClinkerThe residue from the leaching of roasted flotation concentrate
known85,0--15Unrounded materialBulk fraction minus 1 mm to 30%93,7530
the placeholder88,04,57,5-Pellets with a diameter of 30-100 mmPellets with a diameter of 30-100 mm 95%96,8150

1. A method of processing lead Chekov, including heat treatment lead cake with flux and subsequent melting, characterized in that it further includes a step okutyvaya mixture of lead oxide, lime and clinker from wellawaya zinc Chekov followed by heat treatment and melting of the pellets.

2. The method according to claim 1, characterized in that the heat treatment serves pellets particle size of 30-100 mm, prepared from the mixture in the following ratio of components, wt.%:

Lead cake zinc production 85-90

Quicklime 3-5

Clinker from wellawaya zinc Chekov 5-10



 

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SUBSTANCE: claimed method includes heat treatment of lead cake with flux followed by smelting wherein before heat treatment mixture of lead cake, calcium hydroxide, and clinker from lead cake milling is balled to produce pellets. Pellets have fineness preferably of 30-100 mm. Method of present invention affords the ability to increase total coefficient of lead recovery by 3.1 %.

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2 cl, 1 tbl

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