A method of processing materials containing platinum metals and carbonaceous reducing agent

 

(57) Abstract:

The invention relates to ferrous metallurgy and can be used for the recovery of platinum metals from solid intermediates processing of sulphide copper-Nickel ores. A method of processing solid materials containing platinum metals and carbonaceous reducing agent comprises melting the material in the presence of sodium sulfate, liquid-phase sulfatization, leaching. Moreover, the material is pre-melted alloy granularit, crushed and subjected to oxidative leaching solutions of sulfuric acid at atmospheric pressure and aeration, and then undertake sulfatization. To the mixture of melt injected Nickel sulfide concentrate in the amount of 10-20% by weight of source material. The method allows to process materials, which presents refractory compounds, and hydrometallurgical methods to obtain a concentrate of platinum metals. 1 C.p. f-crystals, 1 Il.

The invention relates to ferrous metallurgy and can be used for the recovery of platinum metals from solid intermediates processing of sulphide copper-Nickel ores.

The known method (Patent N 2057193 of the Russian Federation, IPC C 2 B 11/00, et flotation concentration of the crushed ore; the flotation concentrate smelting flux (carbonatite) in the atmosphere of argon or nitrogen with subsequent pressure sulphuric acid leaching of the matte. The result is a residue containing platinum group metals, and solutions containing non-ferrous metals and iron.

This method cannot be applied to materials in which the metals are in the form of oxides, as if melting is formed of a metallic alloy, not amenable to grinding.

The known method (meretukov M. A., Orlov, A. M., "metallurgy of noble metals". - M.: metallurgy, 1991, S. 238-239) processing of anode slime. The slurry composition, %: Cu - 30; Se - 12; Ag - 9; Au - 0,9; Pd+Pt for 77.2 g/t, alloy with sodium bisulfate. Granular speck leached with hot water, the solution was transferred sulfates of copper, silver, and sodium. The dried cake leaching is melted in a reverberatory furnace, impurities are removed from the melt by air oxidation in the presence of a flux of sodium carbonate. Get soda ash and slag containing oxides of non-ferrous metals, and Dore alloy composition, %: Ag - 86-92; Au - 8-9; Pd+Pt - 0,165-0,189.

The method cannot be applied to material containing a carbonaceous reducing agent, since the alloying material with sodium bisulfate is sodium in the second stage pyrometallurgical refining, leads to severe deterioration of the masonry of the furnace soda slag.

The closest adopted for the prototype is the way ("fundamentals of metallurgy", so 5. - M.: metallurgy, 1968, S. 347-348) electrolytic processing" sludge containing platinum metals. The sludge is subjected to an acid wash, followed by hydraulic classification. Selected fine fraction is filtered off and subjected to liquid-phase sulfatization with subsequent leaching. This removes impurities base metals contained in the original material. Dried after sulfatization, leaching and filtration cake sitout with charcoal, calcium carbonate and sodium bisulfate and subjected to melting, as a result, the alloy containing more than 50% of the platinum metals.

The known method cannot be applied to materials in which base metals are difficult to reveal hydrometallurgical methods forms intermetallic compounds, oxides). Also contained in the original material silica and carbonaceous reducing agent complicate the process of filtration of the pulp obtained after leaching of the material.

Material containing platinum metals and carbon which include processing of Nickel concentrate from the flotation separation of copper-Nickel matte: oxidative roasting, plateresco recovery of candle burning, leaching material recovery cuprous sulphate solutions and dissolution of circulating cement copper.

According to the analysis phase, the basis of the material presented Nickel(iron-copper)-containing oxides, which together with silicates and aluminosilicates form insoluble compounds. The material on average contains, in %: Ni - 46; Cu - 2,0; Co - 3,0; Fe - 5,0; S - 1,0; C - 15; SiO3- 6,0; Al2O3- 4,0; Pd+Pt - 0,15.

A method of processing solid materials containing platinum metals, including smelting the material in the presence of sodium sulfate (NaHSO4; Na2SO4and purification from impurities, which differs from the prototype in that the melt is subjected to a material containing platinum metals and carbonaceous reducing agent with obtaining alloy, which granularit, crushed and purified from impurities oxidative leaching solutions of sulfuric acid at atmospheric pressure and aeration, and then undertake sulfatization. To the mixture of melt injected Nickel sulfide concentrate in the amount of 10-20% by weight of the material.

The proposed method allows on-stage pyrometallurgical refining translate Finance sulfur sodium, generated during the recovery of sodium sulfate carbon material. Oxides of silicon and aluminum are transferred into the slag phase. With the introduction of the charge melting 10-20% Nickel concentrate provides the sulfide-metal alloy, the total content of platinum metals 1700 - 1900 g/t in their quantitative extraction of not less than 97 percent.

When the content in the charge of the concentrate is less than 10%, the degree of extraction of precious metals in the alloy is not more than 95%. While the proportion of Nickel concentrate in charge of more than 20% of the obtained alloys, poor in content of precious metals.

Alloy granularit and crushed, with the aim of obtaining material, uniform in size, and increase the reaction surface of the material during subsequent leaching.

At the stage of sulfuric acid leaching solution is translated and partially metallized sulfide phase alloy. Aeration of the pulp leaching air extracts in a solution of Nickel metal and cemented copper with partial suppression of hydrogen.

The filtered residue leaching is subjected to liquid-phase sulfatization receive a concentrate containing mass fractions pay the technological scheme of processing of the material, containing platinum metals and carbonaceous reducing agent (Fig. 1), and an example of its implementation in laboratory scale.

The proposed method is as follows.

The dried material is mixed with sodium sulfate (NaHSO4; Na2SO4) and Nickel sulfide concentrate. The sodium sulfate to the mixture melting imposed at the rate of complete oxidation of the carbon contained in the material, and obtaining a fusible slag. The charge is melted in an oxidizing atmosphere at a temperature of 1200-1300oC. the Slag is separated and sent to the main production of copper, the alloy is subjected to water granulation. Grandpaw pulverized in the ball-tube mill operating in closed circuit with a spiral classifier, i.e. sand classifier returned for regrinding in the mill. The plum pulp classifier is condensed and filtering.

Leaching the crushed alloy spend working solutions of copper and Nickel production, containing 500 g/l of sulfuric acid, aerated pulp air, at a temperature of 75-80oC. the Solution is directed to the extraction of non-ferrous metals in primary production. Residues leaching after filtering PE Osenniy material, containing 1600 g/t platinum group metals; 15% carbon; 43% Nickel; 2.6% of cobalt; 4% iron and 6% silica was proplavili with 40% sodium sulfate (Na2SO4) and 10% Nickel concentrate. Smelting is conducted at a temperature of ~ 1300oC. After separation of the slag melt, the alloy was ktgranulator and grind to a particle size of 500 μm. Removing the alloy was in %: Ni - 98; Co - 94; Fe - 52; platinum metals - 97. Further, the alloy composition in %: Ni - 75; Co - 3,7; Fe - 2,9; S - 12,5; SiO2~ 0,1; Pd+Pt - 0,19 km wimalasiri solution with a content of sulfuric acid, 350 g/l at T:W=1:7 and a temperature of 80oC. the Filtered residue from the leaching was subjected to liquid-phase sulfatization at a temperature of 290oC, received a concentrate containing the mass fraction of platinum metals and 40% for total extraction of 95%. Extraction of non-ferrous metals in the leaching solutions amounted to 99%.

Thus, the proposed method allows to process materials, which presents refractory compounds (intermetallics, oxides) hydrometallurgical methods to obtain a concentrate of platinum metals and solutions of non-ferrous metals, suitable for processing into copper-Nickel production.

References

1. Patent N 2057193 R, S. 238-239.

3. "Fundamentals of metallurgy", so 5. - M.: metallurgy, 1968, S. 347-348.

1. A method of processing solid materials containing platinum metals, including smelting the material in the presence of sodium sulfate and purification from impurities, characterized in that the melt is subjected to a material containing platinum metals and carbonaceous reducing agent with obtaining alloy, which granularit, crushed and purified from impurities oxidative leaching solutions of sulfuric acid at atmospheric pressure and aeration, and then undertake sulfatization.

2. The method according to p. 1, characterized in that the mixture of melt injected Nickel sulfide concentrate in the amount of 10-20% by weight of source material.

 

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