SU1463781A1 - Method of recovering brass from melting slags - Google Patents

Description

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The invention relates to non-ferrous metallurgy, namely to the processing of slags.

The purpose of the invention. - an increase in the extraction of zinc, containing wasps in the smelting slag, into the resulting brass and the reduction in the cost of the process by reducing the cost of the flux.

The purpose is achieved in that according to the method for extracting brass and zinc from metallurgical tailings, including melting and heating the slag together with the flux, heating is carried out to temperatures of 1050-1170 ° C, and a mixture consisting of 55 65% datolite concentrate, 20-30% soda ash, the rest is borax.

The amount of flux is 30-100% of the mass of the slag phase of the melted brass slag and depends on the content of zinc oxide in the slag.

The limitation of the heating of the melt to a temperature of 1170 s is due to the fact that at 11 70 ° C the vapor pressure of zinc in brass is compared with atmospheric and the brass boils. At the same time, the evaporation of zinc increases dramatically. At temperatures below 1050 C brass is difficult to release from the furnace and pour (the pouring temperature of the low-melting brass L-63 1050-1080 C).

When the content of datolite concentrate in the flux of over 65% decreases, the recovery of brass from smelting slags is reduced due to an increase in melt viscosity. The required liquid flow of the melt is achieved only by heating to temperatures above Il7 (fc, which leads to a reduction in losses

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the kick contained in brass beads. The use of flux containing datolite concentrate less. 55% is impractical because it increases the cost of processing without increasing the recovery of 1din contained in brass beads.

When the content of soda ash in the flux is more than 30%, the extraction of brass deteriorates due to an increase in the adhesion of the melt, as a result of which the fine droplets of brass remain in the slag phase. The use of iraoca with soda ash content less than 20% is impractical because the cost of processing increases without increasing the extraction of q to: a contained in brass beads. The use of a flux with a content of more than 25% borax, less than 55% datolite concentrate and 20% calcified s; jj H4eHHH extracting zinc containing i erocH in brass beads. ,

Adding a flux amount of less than 30% of the mass of the slag phase of the Melting Brass Slag impairs the extraction of brass at temperature, the type is lower, as a tight melt is obtained. Adding more than 100% of the mass of the slab-jicoBoft phase of the melting brass aka is impractical, as the cost of processing increases and the furnace's productivity decreases without increasing the degree of extraction of the puppies that are found in tattoos. The extraction of zinc does not even decrease due to an increase in the duration of smelting.

The proposed method for extracting brass from smelting slag is carried out under laboratory conditions. In the experiment, a technical borax, a technical soda ash, an A grade catholite concentrate, a plain Viln brass slag containing 47.4% of the metal in the form of brass cores with a copper content of 64.2% and zinc of 35.8% are used. The slag phase of the melting slag contains 73.8% zinc oxide, 12.3% sodium chloride, 5.0% nitrous oxide, .3.6% sodium fluoride.

Example 1. In a high-frequency laboratory furnace with graphite tig4637814

The mixture is melted and heated to a 11 OO C mixture of 5 kg of melting brass slag and 4 kg of flux containing 5% to 60% d.tolithic concentrate, 20% soda | Soda and 20% borax. A mixture of 5 kg of slag and 1.3 kg of flux is gradually added, so that the melt is not frozen. The total amount of flux is 10–30.3% of the mass of the slag phase. The melt is heated to 1100 ° C, mixed, held for 3 minutes and poured into a mold. After cooling, the metal and slag in the mold are separated. 15. A brass ingot weighing 4,329 kg, containing 69.1% of copper and 30.9 zinc, is removed from the mold; The extraction of zinc j contained in the brass: Into the resulting brass, it is 20 liters and 78.8%. Copper recovery 98.3%.

Example 2. In a high-frequency laboratory furnace with a coal crucible, it is melted and heated to 11–70 s. . a mixture of 4 kg of smelting brass slag and I, 7 kg of flux containing 55% datolite concentrate, 20% soda ash and 25% borax. . Gradually add 6 kg w, pack, so

 so that the temperature of the melt does not drop below 11. The amount of eoflux is 32.3% by weight of the slag phase. The melt is heated to 1170 ° C, mixed, held for 3 minutes and poured into a mold. After 3S ki, a brass ingot weighing 4.286 kg, containing 69.3% copper and 30.7% zinc, is extracted from the mold. Extraction of zinc contained in braziers of brass is 40 77.5% in brass. Copper recovery of 97.6%.

Example 3. In a high-frequency coal-crucible laboratory furnace, the melt is melted and heated to 11–70 ° C. g a mixture of 4 kg of melting brass slag and j, 4 flux containing 55% datol-concentrate, 20% soda ash and 25% borax. ., Gradually add 6 kg of slag so that gg so that the temperature of the melt does not fall below. The amount of flux is 26.6% by weight of the W of the ack phase. Heat the melt until, mix, hold for 3 min and roll into the gg mold. After the ostishan, a brass ingot weighing 4.065 kg, containing 70.5% of copper and 29.5% of zinc, is extracted from the mold. Extraction of zinc contained in braziers in the resulting brass 70.7%. Copper recovery 94.2%.

Example 4. In a coal crucible in a Tamman furnace, melt and heat a mixture of 200 g of melting brass slag and 100 g of flux containing 65% datolite concentrate, 30% soda ash and 5% borax. The amount of flux 95% by weight of the slag phase. The melt is stirred, held for .3 min and extruded into a mold. After the ostishan, an ingot of brass weighing 86.9 g is extracted from the mold, containing 68.7% copper and 31 zinc. Extraction of zinc, brass holding in beads, to the resulting brass 80.1%. Copper recovery 98.1%.

five . The coal crucible is melted and heated to a mixture of 200 g of melting brass slag and 110 g of flux containing 65% datolite concentrate, 20% calcined soda and 5% borax. Number of flux components is -

em 104.6% of the mass of the slag phase. The melt is stirred, hold for 3 minutes and extruded into a mold. After cooling, an ingot of brass weighing 86.7 g, containing 68.9% of copper and 31.1% of zinc, is extracted from the form. Extraction of zinc contained in the coil rollers of brass, in the resulting brass

79.4%. Copper recovery 98.1%.

Example 6. In a coal crucible furnace Tamman. melted and heated to a mixture of 200 g of melting brass slag and 100 g of flux, co, f

Tamman oven example

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68.7% of copper izinka, soduni are mixed in and out of brass brass;

10- Prim in the Tamm furnace, up to the second brass containing II

 5 percent of the concentrate, dyds and 7% of the auger are mixed by weight; they contain 78.8% of the extracts containing extracts of gold from the bead.

In the Tamm furnace, up to 115% brass containing rata, 15% to 22% of borax is watered. K by the mass of the sll is stirred,

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A 70% datolite concentration of 40 copper is 98.1%.

Pour out of 35 from 86.8 g, zinc soda. Extracted schyogos to kochnuyu latu

a, 23% soda ash and 7% ury. The amount of flux 95% by weight of the lacquer phase. The melt is stirred, held for 3 minutes, and extruded into the izozhnitsa. After cooling down, a brass ingot weighing 5.3 g, containing 68.8% of copper and 1.2% of zinc, is extracted from the specimen. Extraction of zinc containing brass in wrenches, c. Received brass 78.4%. Removing one 96.4%.

Example 7. In a TAMMAN'S COAL crucible, the Tamman furnace is melted and heated to 1 mixture of 200 g of smelting brass slag and 100 g of flux, containing 5.0% datolite concentrate, 27% soda ash and 23% borax. The amount of flux 95% t mass of the slag phase. Melt melt in Tamm furnace up to 115. foot brass 45 containing center, 2. and 30% borax. mass of slag. mix, 50 t in an ingot containing 6 ka. 55 tunes were recovered in the beads of 80.2%.

Used in Tamm stoves up to 1170 foot brass

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stir, incubated for 3 minutes and poured into the mold. After cooling down, a brass ingot weighing 87.1 g, containing 68.7% of copper and 31.3% of zinc, is removed from the mold. Extraction of zinc contained in braziers of brass is 80.3% of the resulting brass. Copper recovery of 98.3%.

10- Example 8. In a coal crucible | in a Tamman furnace, the melt is heated and heated to a mixture of 200 g of melting brass slag and 100 g of flux containing 58% of a datolite con 5 of a concentrate, 35% of soda ash and 7% of borax. The amount of flux 95% of the mass of the slag phase. The melt is stirred, left for 3 minutes and poured into a mold. A brass ingot with a mass of 85.4 g, is extracted from the mold. containing 68.7% copper and 31.3% zinc. Extraction of zinc, contained in braziers, in the resulting brass of 78.8%. Copper recovery 96.4%.

Example 9. In a coal crucible in a Tamman furnace, melt and heat a mixture of 200 g of melting brass slag and 100 g of flux containing 63% datolite concentrate, 15% soda ash and 22% borax. The amount of flux is 95% of the mass of the slag phase. The melt is stirred, left for 3 minutes and you

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40 copper 98.1%.

They are cast into mold. A brass ingot weighing 86.8 g, containing 68.8% and 31.2% zinc, is extracted from the mold 35. Extraction of zinc contained in braziers of brass in the resulting brass of 79.8%. Extract

Example 10. In a coal crucible in a Tamman furnace, a mixture of 200 g of melted brass slag and 100 g of flux containing 48% datolite concentrate, 22% soda ash, and 30% borax is heated and heated to 1150 ° C. The amount of flux 95% by weight of the slag phase. Melt mix, hold for 3 minutes and pour into the mold. A brass ingot weighing 87.0 g, containing 68.7% of copper and -31.3% of zinc, is extracted from the mold. The recovery of zinc contained in brass beads into the resulting brass is 80.2%. Copper recovery 98.2%.

Example 11. In a coal crucible in a Tamman furnace, a mixture of 200 g of melted brass slag and 100 g of flux is melted and heated to 1170 ° C.

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containing 67% datolite concentrate, 32% soda ash and 1% borax. The melt is stirred, incubated for 3 minutes and poured into a mold. An ingot weighing 84.3 g, containing 68% copper, and 31.3% zinc is extracted from the mold. Extraction of zinc contained in brass beads into the resulting brass 77.7%. Copper recovery 94.2%.

I Example 12 (by a known method) / Add dehydrated borax in the amount of 21 g per 100 g of pshak to the melting slag, which corresponds to a flux consumption of 0.4 t / 1 t of the slag phase. Copper extraction is 98.3% and .3: 53.4% of zinc is transferred to the brass obtained. The use of borax greatly increases the cost of extracting brass from slags, and the use of cheaper materials in a known method leads to the loss of most of the zinc:

I The positive effect of this method is to reduce, the cost of smelter processing, 2: slags.

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The use of the proposed method makes it possible to extract a larger amount of zinc into the brass produced, g ging smelting slag contained in brass beads than is possible by known methods. The brass obtained can be used as a charge material for 10 brass smelting, which allows

reduce the consumption of pure copper and zinc and reduce the waste of zinc.

Claims (1)

Invention Formula A method for extracting brass from smelting slag, including the melting and heating of the Ishak with the flux, is also so that, in order to increase the degree of zinc extraction and reduce the cost of the process by reducing the cost of the flux, 1050-1ITO C, and as a flux, a mixture of 55-65% yes-: tolite concentrate, 20-30% soda ash and borax is used. (The rest) the amount of flux is 30-100% by weight of the slag phase melted slag.