The charge for the recovery of precious metals smelting

 

(57) Abstract:

The invention relates to the metallurgy of noble metals and can be used in the production of platinum group metals, gold and silver. The proposed mixture contains calcium oxide, or products based on calcium oxide 5-15 wt.%, working silicate slag production of platinum group metals 30-60 wt.%, Paleochora or water-insoluble residues Perevozchikov rest. The mixture can reduce the dust smelting, get brittle alloy target, to ensure that when the smelting of low-viscosity and low-melting slag. 3 table.

The invention relates to the metallurgy of noble metals (BM) and can be used in the production of platinum group metals (PGM), gold and silver.

In the production of noble metals are formed of different non-target products and waste containing PGM, silver, gold, in particular, such as Paleochora or water-insoluble residues Perevozchikov (N. O. of Perevozchikov), as well as working capital and conditionally final slag.

A characteristic feature of Perevozchikov or N. O. of Perevozchikov is that their base is provided with a large number of different blagorodnie sooty carbon silica and other refractory oxides.

The basis of toxins production of PGMs are silicates of sodium, calcium, iron, magnesium and other base metals. Recycling the waste products contain pretty much confused at the base of slag Korolkov target alloys pyrometallurgical processing, consisting of PGMs, gold, silver, and copper, tellurium, selenium, antimony, bismuth, etc.

Return slag is subjected to typically the electric remelting, while receiving depleted conditionally final slag. For conducting electric remelting of circulating toxins known for a different composition of the charge, giving the satisfactory performance of the extraction of precious metals. Processing of Perevozchikov or N. O. of Perevozchikov is much greater difficulties.

In publicly available literature does not describe the composition of the charge to retrieve BM from Perevozchikov smelting. Specifies, for example, only that recycling can be carried out by pyrometallurgical - melting blend containing as fluxes soda, borax, glass, and in some cases coal, and as a collector of precious metals used copper [fundamentals of metallurgy. So 5. - M.: metallurgy, 1968, S. 316].
- calcium oxide - 10-13;

silicate glass 17-20;

- insoluble residues (N. O.) - the rest.

This mixture is closest to the proposed and adopted for the prototype.

The disadvantages of the prototype of charge when used for melting Perevozchikov or acting of Perevozchikov include;

- the big dust smelting;

- getting in the process of melting ductile (plastic) alloy target, which cannot be crushed to a powder necessary for hydrometallurgical processing;

is not provides the smelting of low-viscosity and low-melting slag, which leads to high residual contents of noble metals in the slag.

The technical result of the present invention is to remedy these disadvantages.

This result is achieved by the fact that the proposed charge for the recovery of precious metals smelting, containing products and waste of precious metals and material containing calcium oxide, according to the invention as industrial products and waste it CE silicate slag production of platinum group metals, as the material containing calcium oxide, calcium oxide, or products based on calcium oxide, in the following ratio of components, %:

Calcium oxide, or products based on the calcium oxide - 5-15

Working silicate slag production of platinum group metals - 30-60

Paleochora or water-insoluble residues Perevozchikov - Rest.

Silicate from recycled slag contributes to the pelletizing wet dust during drying of the charge and involved in the process of recovering silver from AgCl. Produced from slag goldcrests not only have a high fragility of themselves, but are able to give the fragility and the additional number attached to them alloys on silver-lead basis.

Contents working silicate slag in the mixture is less than 30% is not sufficient to provide the desired temperature of its melting point (not higher than 1300oC) regardless of the type of industrial products and (or) waste.

In addition, it is often not achieved and the effect of embrittlement of the target alloy.

The contents of the circulating slag in charge equal to 30%, a satisfactory extraction BM from almost all raznovidnostey to improve the quantitative performance of extraction BM when using any of the known manufacturing practice BM types of used industrial products and (or) waste.

The increase in the content of the additive reverse of the slag in the furnace charge more than 60% is impractical as it does not lead to further improvement of the recovery rate BM smelting, reducing the useful fusion N. O. dusts.

The reduction of silver chloride slag components is accompanied by a decrease in the content of sodium oxide in the slag. With the aim of preserving the optimum properties (viscosity and fusion) of the slag melt during the metallization of silver chloride, the mixture is injected additive oxide of calcium, or the addition of any material based on it.

The decrease in the content of calcium oxide in the mixture is less than 5% is undesirable because it can lead to incomplete reaction of the recovery of silver chloride. The increase in the content of calcium oxide more than 15% it is also impractical, as it leads to the formation of smelting too basic slag.

Examples of use

Example 1. For batch took 29,0 g N. O. dusts electrostatic precipitators (dry weight), 29.0 g of crushed reverse silicate slag refining production and 6.5 g of calcium oxide (lime). All components of the mixture were mixed, the mixture was loaded into Lundby crucible and placed in the mine laboratory electropac the furnace. After cooling, the products of melting removed from the crucible, divided by natural boundaries of the phases. When this was received: 35,0 g slag, 5.8 g heavy metal alloy and 4.3 g of chalcogenide stenopogoninae alloy. The slag according to the results of spectral analysis did not contain PGMs, gold and silver. Target the products of melting - heavy metal alloy and stenopogoninae chalcogenide (the so-called "light") alloy have sufficient mechanical grinding fragility, were milled on a laboratory vibroisolation to a particle size of minus 0,315 mm and analyzed for content of PGMs, gold and silver (table. 1).

PGM and gold from the crushed target products of melting of the proposed charge can then be easily translated into a chloride solution of known ways, including using the most progressive method of chlorine in hydrochloric acid solution (see I. N. Malinetskii, L. C. Chugaev, C. F., Borbat and other metals precious metals. Ed. 2, Ed. by L. C. tchugaev. - M.: metallurgy, 1987, C. 416).

Example 2. For batch took 592 kg wet (W = 45%) N. O. of Perevozchikov electrostatic PGM 324 kg working granulated slag (W= 5%) production Mathdelane into six equal portions and loaded in layers 6 boats, on 175-176 kg each (see table. 2).

All was prepared 6 boats of burden that were simultaneously loaded into the drying furnace bogie hearth furnaces. Drying parameters of the charge: temperature - 300oC, time - 9 hours.

After drying, the mixture of all components of the charge of the 6 boats poured into the hopper. Then the mixture from the hopper downloaded for smelting in reverberatory fuel rotary kiln type.

Furnace included warm-up and implemented the melting of the charge. The temperature of the melt in the furnace before discharge products of fusion was determined using infrumusetare pyrometer and was 1200-1250oC.

The products of melting were flushed out of the oven in a cast iron ladles-moulds. After cooling of the bucket was extracted 428 kg of slag and of 96.2 kg target of an alloy of noble metals.

The target alloy of noble metals have sufficient fragility and was crushed in a ball mill to a particle size of minus 1 mm melting Products were tested and analyzed for content of PGMs, gold and silver. Testing of the target alloy was performed after grinding, testing slag conducted sampling at discharge from the fiery liquid.

The content of her noble subjected to dissolution and processing using known methods.

The charge for the recovery of precious metals smelting, containing products and waste of precious metals and material containing calcium oxide, characterized in that the quality of products and production wastes it contains Paleochora or water-insoluble residues Perevozchikov containing precious metals, and recycled silicate slag production of platinum group metals as a material containing calcium oxide, calcium oxide, or products based on calcium oxide in the following ratio of components, %:

Calcium oxide, or products based on the calcium oxide - 5 - 15

Working silicate slag production of platinum group metals - 30 - 60

Paleochora or water-insoluble residues Perevozchikov - Rest

 

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