RU2178342C1 - Method for processing copper containing products - Google Patents

Abstract

FIELD: procession of oxidized copper ores, combined sulfide-oxidized copper ores and intermediate products, dump tails and slags including oxidized copper compounds. SUBSTANCE: method comprises steps of crushing and disintegrating initial product until fraction size exceeding size necessary for flotation; leaching and subsequently separating liquid and solid phases of product, afterdisintegrating solid phase and realizing flotation process. Liquid phase is subjected to extraction for separating purified product and copper containing solution of extracting agent. Purified product is used again at leaching. It is possible to perform reextraction of copper out of copper containing solution of extracting agent. Recovered extracting agent is used at extraction; pure copper containing solution is subjected to electric extraction; waste electrolyte after electric extraction is used for reextraction. Extraction is realized by providing contact of copper containing solution (liquid phase of product) with organic cation exchange extracting agent. EFFECT: enhanced efficiency of copper extraction, improved ecological condition of process. 3 cl, 1 dwg, 2 tbl, 2 ex

Description

 The invention relates to a method for processing oxidized copper ores, mixed sulfide-oxidized copper ores, as well as intermediate products, dump tailings and slags containing oxidized copper compounds.

 Known methods for producing metals, which include grinding the starting material to a particle size larger than the particle size required for flotation, followed by the addition of sulfuric acid and leaching in the presence of iron grinding bodies, followed by the direction of solid residues to flotate copper deposited on iron bodies (see DE 2602849 B1, C 22 B 3/02, 30.12.80).

 The disadvantage of this method is its high cost in connection with the use of iron bodies, which, in turn, react with sulfuric acid, which increases the consumption of sulfuric acid and iron grinding bodies.

 There are also known methods for the extraction of copper from a copper-containing material, which include crushing and grinding the initial product, leaching (oxidizing) and obtaining copper from a leaching solution, as well as flotation (US 5795465 A, H 03 B 9/00, 08/18/98).

 The disadvantage of this method is its inefficiency when using oxidized ores (it is intended for porphyry copper ores) and its environmental harmfulness (leaching is performed using ammonia).

 There are also known methods for the extraction of copper, which include dry crushing up to 2, 4, 6 mm, leaching with hydraulic classification, subsequent flotation of the granular part of the ore and the precipitation of sludge copper concentrate with sponge iron from the sludge part of the ore (a. USSR N 45572, B 03 B 7/00, 01/31/36).

 The disadvantage of this method is the incomplete extraction of copper and the use of sponge iron, which makes the process expensive and leads to poor quality products.

 A number of methods for copper extraction and processing are also known, including biooxidation, autoclave leaching, ammonia leaching, copper precipitation with iron scrap, etc. (CM. US 5919674, US 5895633, US 5403382, SU 1721106, RU 2149709, GB 1429490, etc. d.).

 All of them have various disadvantages - either expensive, or they do not fully recover the metal, or environmentally harmful.

 The closest in technical essence to the claimed method is a method for extracting copper from copper-containing materials, which consists in grinding to flotation size, leaching, separation of the solid and liquid phases of the product, extraction of the liquid phase of the product with the release of the raffinate and the copper-containing extractant solution, repeated use of the raffinate during leaching ( see Abramov A.A., Leonov S. B. Enrichment of non-ferrous metal ores, M., Nedra, 1991, p. 137).

 The disadvantage of this method is the incomplete extraction of copper, since the solid residue is not subjected to further processing.

 The technical result of the claimed method is to increase the efficiency of copper extraction with improving the environmental cleanliness of the process.

 To do this, in the method of processing copper-containing products, which consists in leaching, separation of the solid and liquid phases of the product, extraction of the liquid phase of the product with the separation of the raffinate and the copper-containing extractant solution, repeated use of the raffinate during leaching, crushing and grinding of the initial product is carried out to the size of fractions exceeding the size of fractions required for flotation, and after leaching, the solid and liquid phases of the product are separated, while the solid phase of the product is crushed with p next flotation and the liquid phase is subjected to extraction of the product with the release of copper-bearing extractant and a raffinate solution, wherein the raffinate is repeatedly used in leaching.

 Additional features of the method are that copper is re-extracted from the extractant solution and the regenerated extractant is used during extraction, and a pure copper-containing solution is subjected to electroextraction, after which the spent electrolyte is used during reextraction.

 Also additional features of the method is that the extraction is carried out by contacting a copper-containing solution with an organic extractant of the cation exchange type.

 The drawing shows a structural diagram of a method for processing copper-containing products. The method contains the following operations: crushing and grinding of the starting product 1, leaching 2, separation of solid and liquid phases 3, regrinding 4, flotation 5, extraction 6, reextraction 7, electroextraction 8.

 The functioning of the method is as follows.

 Crushing and grinding of the initial product (ore) is carried out to a particle size fraction greater than that necessary for flotation, which saves energy and reduces the consumption of sulfuric acid.

 After this, sufficiently large fractions are subjected to leaching, adding an aqueous solution of sulfuric acid to them. In this case, a significant amount of readily soluble copper passes into the solution.

 Next, the solid and liquid phases of the product are separated, while the liquid phase is a copper-containing sulfate solution.

 Next, the liquid phase is subjected to extraction by contact with an organic extractant of the cation exchange type, which has a higher selectivity for copper than for other metals in the liquid phase. In this case, a copper-containing extractant solution with a high copper content and a raffinate with a high concentration of sulfuric acid and a low copper content are obtained.

 This raffinate is repeatedly used for leaching.

 The solid phase is crushed to the size of the fractions needed for flotation, and flotation is carried out using collector reagents commonly used for flotation of sulfide minerals. Since the surface layer of the solid phase practically does not contain copper extracted during leaching, during flotation, only copper-containing fractions that are a copper concentrate used for further processing are quite easily separated.

 The copper-containing extractant solution is subjected to reextraction with the release of a pure copper-containing sulfate solution and a regenerated organic extractant, which is used repeatedly during extraction.

 Pure copper-containing sulfate solution is subjected to electroextraction with the release of cathode copper and spent electrolyte, which is used during reextraction.

 Thus, the process of processing the liquid phase is almost cyclic, without emissions of harmful substances, and the process of processing the solid phase allows you to get dump tailings, practically free of copper.

 Example 1

 Mixed sulfide-oxidized copper ore containing 40% copper in the form of sulfides and 60% copper in oxidized mineral forms was processed according to the known method, which consists in grinding to flotation size (85% class - 0.074 mm), leaching, separation of solid and liquid phases , copper extraction from the liquid phase and electroextraction, as well as according to the proposed method, which consists in crushing and grinding the initial product to a grain size larger than the grain size required for flotation (10 mm), leaching, separation solid and liquid phases of the product, while the solid phase of the product was crushed, followed by flotation, and the liquid phase of the product was subjected to extraction, followed by electroextraction of copper. Leaching of ore during processing by a known method was carried out under the most favorable known conditions for this type and composition of ore.

 Comparative results are shown in table 1.

 A comparison of the presented results shows that the total copper extraction into commercial products by the proposed method is 90.44%, while by the known method it is only 54.15%. Thus, copper recovery is increased by 36.29%, including 34.39% due to an increase in the extraction of sulfide copper and by 1.9% due to the creation of more favorable conditions for the leaching of copper from oxidized mineral forms.

 Example 2

 Mixed sulfide-oxidized copper ore containing 55% copper in the form of sulfides and 45% copper in oxidized mineral forms was processed according to the known method, which consists in grinding to flotation size (80% class - 0.074 mm), flotation to obtain sulfide in the foam product concentrate, leaching of the chamber flotation product, separation into solid and liquid phases, the solid phase being dump tailings, copper extraction from the liquid phase and electroextraction, as well as according to the proposed method consisting in crushing and grinding the initial product to a grain size larger than the grain size required for flotation (10 mm), leaching, separation of the solid and liquid phases of the product, while the solid phase of the product was crushed with subsequent flotation, and the liquid phase of the product was subjected to extraction followed by electroextraction of copper . Ore flotation and leaching of the chamber flotation product during processing by a known method were carried out under the most favorable known conditions for this type and composition of ore.

 Comparative results are shown in table 2.

 Comparison of the presented results shows that the total copper extraction into commercial products by the proposed method is 90.35%, while by the known method it is only 77.52%. Thus, copper recovery is increased by 12.83%, including by 9.01% due to sulfide copper and by 3.82% due to copper found in oxidized minerals. An increase in copper recovery from oxidized minerals is achieved by creating the most favorable leaching conditions, and an increase in copper sulfide recovery during flotation is achieved by removing oxidized films from the surface of sulfide minerals.

 EFFECT: invention makes it possible to extract copper from low-profitable deposits with a low copper content.

Claims (3)

 1. A method of processing copper-containing products, which consists in leaching and extracting copper from a leaching solution, separating the solid and liquid phases of the product after leaching, extracting the liquid phase of the product with the separation of the raffinate and copper-containing extractant solution, using raffinate repeatedly during leaching, characterized in that the initial product subjected to crushing and grinding to a grain size fraction exceeding the grain size required for flotation, while after separation the solid phase of the product grind with subsequent flotation.  2. A method for processing copper-containing products according to claim 1, characterized in that the copper is re-extracted from the copper-containing extractant solution and the regenerated extractant is used during extraction, and the pure copper-containing solution is subjected to electroextraction, the treated electrolyte after which is used for reextraction.  3. A method for processing copper-containing products according to claim 1, characterized in that the extraction is carried out by contacting the copper-containing solution with an organic extractant of the cation exchange type.

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