Method for processing of copper-based electronic scrap containing noble metals

FIELD: metallurgy.

SUBSTANCE: method for processing of copper-based electronic scrap containing noble metals, consists in the fact that the electronic scrap is exposed to oxidising melting to produce an alloy with copper content of 55-85 wt %. The produced alloy is exposed to dissolution by means of electrochemical dissolution in a sulphate copper solution at voltage of 0.8-1.5 V on electrodes with production of sludge containing gold and silver, and an alloy on the cathode, containing copper and palladium. This alloy is exposed to electrochemical dissolution in the copper sulphate solution at voltage of 0.3-0.5 V on electrodes to produce copper on the cathode and sludge containing palladium. At the same time the produced sludges without mixing are leached with sulfuric acid.

EFFECT: higher extent of copper and noble metals extraction from copper-based electronic scrap.

2 ex

 

The invention relates to the metallurgy of non-ferrous metals and can be used by enterprises to obtain non-ferrous and precious metals and their alloys obtained by recycling of electronic devices and components.

A method of refining metal scrap containing copper (avts SU # 1669194, publ. 23.12.1992,), including selective smelting of copper by immersion baskets of scrap in the melt. To extract contained in the scrap refractory metals smelting lead to the solution of calcium at 850-870C.

The downside is that cleaning copper alloy passes through the individual components. Cleaning copper is not completely.

A known method of producing alloys of copper from secondary raw materials (avts SU # 1836473, publ. 23.08.1993, including the mixing of metal-containing component with a top-refining flux, briquetting the mixture, the melting of the pellets. As a metal-containing component is used wrens metals fraction 7-0,5 mm, mixed with flux is carried out in a ratio of 1:0,02-0,04 use a flux with a melting temperature of 100-150C below the melting temperature of the metal, and briquetting of metal leads to a density of 6.4 to 7.0 g/cm3.

The downside is that cleaning copper alloy passes through the individual components. Cleaning copper is not completely.

There is a method of refining the edit (avts SU # 1406198, publ. 30.06.1988, including the oxidation of molten copper by oxygen, reduction of oxidized copper in the molten metal by carbon or hydrogen-containing reagent and electrochemical dissolution of copper. In order to reduce the quantities passing the resulting circulating copper-containing intermediates and increase the recovery of copper in industrial metal after recovery of oxidized copper it further treated with a reagent containing silicon metal.

The disadvantage is that it cannot be recycled copper-containing waste with a high content of metal impurities.

There is a method of processing electronic scrap containing precious metals (U.S. Pat. RU # 2090633, publ. 20.09.1997 year). The method includes melting a source of raw materials to produce alloy of complex composition, containing, in particular, copper, electrolytic refining of the alloy in acid with getting mud and cuttings. Electrochemical dissolution is carried out in a solution of nitric acid with a density of from 1.1 to 1.15 g/cm3 alternating current of industrial frequency and voltage of 5-10 V At current density of 0.02-0.2 l/cm2 to obtain a solution containing Ag, Pd and non-ferrous metals and sludge containing gold and tin. The sludge carried by annealing at 500-550C and leaching the product of calcination in Aqua Regia.

a method of refining alloys, containing precious metals on the basis of Cu and/or Zn (U.S. Pat. RU # 2017842, publ. 15.08.1994 g)adopted for the prototype. The method comprises dissolving in solutions containing HNO3and the subsequent allocation of precious metals by cementation. The dissolution of the subject alloys with noble metal content greater than 45%, and the cementation is carried alloys or with a lower content of precious metals with obtaining cement noble metals, or with a high content of noble metals with obtaining cement noble metals and alloy chementator, followed by separation of precious metals from the product received.

The disadvantage of this method is the use of nitric acid, which requires special methods of environmental protection.

The disadvantage of this method is that the alloy after melting is subjected to separation into elements using nitric acid, which requires special methods of environmental protection.

The technical result is to increase the degree of extraction of copper and precious metals from electronic scrap.

The technical result is achieved in that in the method for processing electronic scrap copper based, containing precious metals, including smelting source material with obtaining alloy electrochemical dissolution of the alloy in the solution obtained with the eating of the sludge, processing of the obtained products, electronic scrap is subjected to oxidative heat to obtain an alloy with a copper content of 55-85 wt.%, the obtained copper alloy is subjected to electrochemical dissolution in sulphate solution copper when the voltage at the electrodes of 0.8-1.5 V to obtain a slurry containing gold and silver, and an alloy containing copper and palladium, which is subjected to electrochemical dissolution of sulfate in the solution of copper, when the voltage at the electrodes of 0.3-0.5 V to produce copper and sludge containing palladium, with the resulting sludge, no mixing, leached with sulfuric acid.

Oxidative fusion to obtain an alloy with a copper content of 55-85% and the use of copper sulfate helps to ensure the possibility of electrochemical dissolution of the anode.

Electrochemical dissolution of the obtained copper alloy in sulphate solution copper when the voltage at the electrodes of 0.8-1.5 V provides and allows you to separate gold and silver from palladium and copper to obtain a slurry containing gold and silver, and an alloy containing copper and palladium.

The implementation of electrolysis at 0.8 to 1.5 In sulphate solution copper allows you to transfer to the cathode copper and palladium. The reduction in voltage below 0.8 V leads to the transition of palladium in the slurry, and the increased voltage is greater than 1.5 In the decomposition of the electrolyte.

Electrical wiring in khimicheskoi dissolution of the alloy, containing copper and palladium, in sulphate solution copper when the voltage at the electrodes of 0.3-0.5 V to produce copper and sludge containing palladium, allows to separate the copper and palladium.

The second electrolysis at a voltage of 0.3-0.5 V translates palladium in the sludge with getting on the cathode electrolytic copper.

The sludge leaching in sulfuric acid increases the concentration of noble metals in the sludge due to the removal of oxidized copper compounds.

Low boiling point of nitric acid determines the high volatility vapors HNO3. Use in the leaching of sulfuric acid instead of nitric acid provides high performance for the recovery of precious metals and environmental friendliness.

Sludge after electrochemical dissolution are concentrates of gold, silver and palladium, which can be processed by known methods

The method is as follows. Electronic scrap copper based, containing precious metals, is subjected in a known manner oxidizing smelting to obtain an alloy with a copper content of 55-85 wt.%. Smelting is carried out, for example, in an induction furnace (see Daijosai. Metallurgical furnaces, ed. "Metallurgy" M, page 612), the oxidation of the impurities is carried out, for example, fed into the melt of the air (see Nvhodgm, Apple is I. Quick reference metallurgy of non-ferrous metals, ed. "Metallurgy", M. 1975, str).

Then the obtained copper alloy with a copper content of 55-85 wt.% subjected to electrochemical dissolution of the anode in sulphate solution copper when the voltage at the electrodes of 0.8-1.5 V to obtain a slurry containing gold and silver, and alloy on the cathode containing copper and palladium. The process is carried out, for example, in the electrowinning cells (see Nvhodgm, Apini, Quick reference metallurgy of non-ferrous metals, ed. "Metallurgy", M. 1975, p.148). Obtained at this stage, the slurry containing gold and silver are leached with sulfuric acid. The leaching is carried out, for example, in the apparatus with a mixing device (see Enamel equipment. The catalogue. M Containerised, 1986).

The cathode is an alloy containing copper and palladium, is subjected to electrochemical dissolution of the anode in sulphate solution copper when the voltage at the electrodes of 0.3-0.5 In getting to the cathode copper and sludge containing palladium. The resulting slurry containing palladium, not mixing with the slurry containing gold and silver are leached with sulfuric acid.

Example 1. Electronic scrap copper based subjected to oxidative heat to the copper content of 55 wt.% (the composition of the alloy, wt.%: copper - 55,0; Nickel - 15,5; cobalt - 0.8; zinc - 15,0; lead - 2,6; olo is about - 1,5; iron - 5,2; silver - 3,5; gold - 0,20; palladium - 0,9). The resulting alloy is subjected to electrochemical dissolution in sulphate solution copper when the DC voltage on the electrodes of 1.5 In obtaining slurry containing gold and silver, and an alloy containing copper and palladium.

Of the copper alloy in the sludge passes 99.9% of gold and silver and 0.5% of palladium. The cathode goes to 99.9% copper and 99.5% of palladium. A slurry containing gold and silver are leached with sulfuric acid solution.

Obtained at the cathode alloy containing copper and palladium, is subjected to electrochemical dissolution in sulfuric acid solution of copper when the DC voltage on the tub 0,3 Century in the sludge goes to 99.9 wt.% palladium, and the cathode of 99.9 wt.% copper.

The resulting slurry containing gold and silver, the first electrochemical dissolution after leaching in sulfuric acid can be recycled by melting the gold-silver alloy (metal Dore).

A slurry containing palladium, the second electrolysis after leaching in sulfuric acid contains up to 99.9 wt.% palladium.

Example 2. Electronic scrap is subjected to oxidative heat to the copper content of 85 wt.% (the composition of the alloy wt.%: copper - 85; Nickel - 5,4; cobalt - 0,2; zinc - 1,2; lead - 0.1; tin - 0.1; iron - 0,1; silver - 6.5; gold - 0,30; palladium - 1,1.). The alloy is subjected to elec is sohimicheskim dissolution in sulphate solution copper when the DC voltage on the electrodes of 0.8 Century In the sludge goes to 99.9 wt.% gold and silver, 0.5 wt.% palladium. On the cathode moved to 99.9 wt.% copper and 99.5 wt.% palladium. Obtained at the cathode alloy containing copper and palladium, is subjected to electrochemical dissolution in sulphate solution copper when the voltage at the electrodes of 0.5 C. the slurry is transferred to 99.9 wt.% palladium, and the cathode of 99.9 wt.% copper. The cathode contains 99.9% of copper. The resulting slurry containing gold and silver, the first electrolysis after leaching in sulfuric acid can be recycled by melting the gold-silver alloy (metal Dore). A slurry containing palladium, the second electrolysis after leaching in sulfuric acid contains up to 99.9 wt.% palladium.

Thus, the method allows to increase the degree of extraction of copper and precious metals from electronic scrap copper based.

A method of processing electronic scrap copper based, containing precious metals, including the dissolution of the alloy in the solution to obtain a slurry, recycling of the products obtained, characterized in that before the dissolution of electronic scrap is subjected to oxidative heat to obtain an alloy with a copper content of 55-85 wt.%, dissolution is subjected to the resulting alloy by electrochemical dissolution in sulphate solution copper when the voltage at the electrodes of 0.8-1.5 V to obtain a slurry containing gold and silver on the cathode alloy, containing copper and palladium, which is subjected to electrochemical dissolution in sulphate solution copper when the voltage at the electrodes of 0.3-0.5 V to produce copper cathode and sludge containing palladium, with the resulting sludge without mixing leached with sulfuric acid.



 

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