Method of copper extraction from solutions

FIELD: metallurgy.

SUBSTANCE: method includes copper sedimentation by solution contact with copper-bearing clinker. Before sedimentation clinker is treated with solution containing sulphydric collector, for instance solution containing 0.5-10 g/l of xanthate, during 15-30 minutes. After treatment clinker is contacted with copper-bearing solution.

EFFECT: improving clinker sedimentary capacity, rate and degree of copper sedimentation.

1 tbl, 1 ex

 

The invention relates to non-ferrous metallurgy, in particular to methods for extracting copper from poor technological and waste solutions. In particular, the method can be used to extract copper from solutions heap or underground leaching and acid mine water.

The copper content of such solutions does not exceed 5-10 g/l, and the concentration of the free acid not more than 5 g/l (pH≥1,5-2). Apart from copper solutions contain zinc, iron and smaller amounts of other metals. When heap and in-situ leaching solutions are in circulation, and the main task is the most complete extraction of copper. The impurities thus tend to leave in solution. From acidic dilute solutions in practice most of the copper is removed by cementation, sorption, extraction (1. EN 2070587 from 20.12.96; 2. SU 312886 And from 28.10.71; 3. SU 414322 And from 05.02.74; 4. SU 456413 And from 05.03.75; 5. UK 2270088 And from 02.03.94; 6. WO 96/02679 And from 01.02.96).

Cementation is mainly carried out with the use of iron scrap or chips. When extracted from the technological solutions used metal zinc, Nickel and other metals. In any case, the resulting cemented contains a significant amount of precipitating metals, and the cost of used metals-amendatory reduce the economic efficiency of these methods.

Sorption and extraction allow polarad intermediate operations to obtain a very squared away and even refined copper, sorbents and extractants are in current use and this increases the efficiency of extraction of copper. However, the multistage technology, high cost used extracting chemicals and sorbents are the major drawbacks of these options.

The set of essential characteristics closest to the claimed may be adopted a method using copper clinker as a material for cementation of copper (7. EN 2118990 from 20.09.1998).

Clinker is an intermediate formed during the processing of zinc sulfide concentrates, contains 2.5-3% Zn, 1 to 3% Pb, 1-3% Cu, 35-40% Fe. The particle size of the clinker from dust up to 50 mm, an Essential component of the clinker is carbon (20-30%). To extract copper and precious metals often clinker processed in copper production.

The basis of the prototype is the use of organic carbon (coke, coal) and metallic iron in the clinker for the extraction of copper from solutions. On carbon with highly developed surface, copper sorbed. Iron acts as comentator. Clinker in contact with copper-bearing solutions enriched with copper and more than can be effectively processed in copper production.

Thus, the use of clinker in the processing of copper-containing solutions can solve the ve tasks to extract copper from poor solutions and enrich clinker copper.

The main disadvantage of the prototype is relatively low precipitation ability of clinker. 1 ton of a typical zinc clinker production in the regime of percolation of the solution heap leaching with initial copper content of 1.5 g/l allows you to extract no more than 20 kg of copper. However, the duration of contact of the solution and clinker - at least 20-30 minutes, and the residual equilibrium copper content of not less than 0.03-0.05 g/l

The present invention aims to eliminate this drawback and to improve the precipitation ability of clinker, the speed and extent of deposition of copper from poor solutions.

The task is solved in that the clinker pre-treated with a solution containing sulfhydryl collector, such as xanthate, and then processed clinker is brought into contact with the copper-containing solution.

Xanthate, like all sulfhydryl collectors used in flotation with iron cations and heavy non-ferrous metals forms a poorly soluble compounds. Coating the surface of the sulfide mineral particles these connections give them properties, hydrophobicity and based on this flotation. The low solubility of xanthates heavy non-ferrous metals are also used for their extraction from waste dissolve the s.

Contact clinker with a solution of xanthate (modifier solution) at the stage of preliminary processing of oxidized and hydrated the surface of the particles of metallic iron, the surface oxide is covered with a monolayer of iron xanthate:

Fe2O3(Fe(OH)2)+C2H5OCSS-=Fe(C2H5OCSS)2↓+HE-

The surface of coal particles, including pores, also covered by the xanthate due to sorption. The xanthate in the end is firmly fixed on the surface of particles of clinker.

After treatment with a solution of xanthate clinker is separated from the treatment solution and brought into contact with the copper-containing solution. Owing to the greater strength of the connection Cantat-ion battery with copper, the latter displaces iron from the surface of the connection:

Cu2++Fe(C2H5OCSS)2=Fe2++Cu(C2H5OCSS)2↓.

A similar connection is formed also on the surface and in the pores of the carbonaceous fraction of clinker.

A feature of this process is that the mass of clinker granules concentration of precipitating reagent - xanthate is quite high, while the remainder of the reaction reagent system does not contain. This allows the reaction zone the equilibrium to shift towards the full transfer of copper in the solid phase. During percolation magisteria is his solution of the copper remains in the clinker, filtering is not required.

Conditions of pre-treatment must meet

requirements as fast as possible and complete saturation of clinker adsorbed xanthate. Experiments have shown that these requirements are met by the concentration of xanthate in the modifying solution of 0.5-10 g/l, and a duration of 15-30 minutes.

Implementation of the proposed method of analysis described in the following examples.

The clinker used for the deposition of copper had a composition of 3.5% Zn, 3%R to 2.6% Cu, 34% Fe, 22% S. Of existing clinker samples by sieving singled out a class - 10+0,25 mm as the modifier used a solution of potassium butyl xanthate in technical water.

The investigated model copper-containing solution had the composition: 130 mg/l Zn, 760 mg/l Cu, 1370 mg/l Fe; pH of 2.1.

Sample clinker weighing 100 g was brought into contact with 0.5 l of a solution of xanthate in the reaction flask. The concentration of xanthate in the modifying solution is given in the table. At the end of a specified time modified clinker were filtered off, washed free from xanthate and brought into contact with the copper-containing solution (0.5 l). The copper deposition was performed with periodic mixing and sampling of the solution. In the samples analyzed the content of copper.

For comparison, a spent copper deposition source clinker according to the method of the prototype.

Results the ATA experiments presented in the table.

no experienceThe duration of treatment xanthogenates, minThe concentration of xanthogenate in the modifying solution, g/lThe duration of the deposition of copper, minThe residual copper content, mg/l
1100,23053
6037
2150,53017
607
3251,0306,5
60the 3.8
40 5,0202,2
301,7
53510,0201,9
301,5
61 hour15,0201,6
301,4
7Prototype (original clinker)3064
6052

Comparative analysis of the known technical solutions, including fashion, selected as a prototype, and an alleged invention allows to make a conclusion, Thu is exactly the set of stated characteristics are provided by the perceived achievement of the technical result. Implementation of the proposed method of analysis makes it possible to increase the degree and rate of deposition of copper from poor solutions when used as a precipitator of clinker.

The method of extracting copper from copper-bearing solutions, including deposition of copper by contacting the solution with copper clinker, wherein the clinker pre-treated with a solution of sulfhydryl collector, which is used as the xanthate solution with a concentration of 0.5 to 10 g/l, within 15-30 min, followed by contacting the treated clinker with a copper-containing solution.



 

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23 ex, 1 tbl

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