SU804707A1 - Method of concentrating and activating complex cupric sulfides - Google Patents

Description

i

The invention favors non-ferrous metallurgy, in particular, to methods for processing chalcopyrite-containing flotation concentrates.

A known method of enriching and activating complex copper sulphides containing iron by pulp electrolysis in a chloride solution at elevated temperature with the separation of the anodic and cathodic space by a diaphragm. According to this method, the experiments were carried out in a conical glass vessel, and the cathode made of lead with an area of 30-40 cm was reinforced from below with epoxy glue. The anode space is separated from the cathode by a conical diaphragm made from polyethylene fabric. The anode is a grid of a plate located parallel to the cathode. 2-10 M HC1 solutions and 1-2.5 M H2SO4 solutions are used as an electrolyte. The concentrate with a particle size of 75-81% 0, 074 mm is placed on the cathode, the current density is maintained at 1300-11000 A / m, the temperature in the electrolysis bath is changed from 70 to 90 ° C. By electrolysis of chalcopyrite concentrate pulp optimal conditions: 5 M N BO-9 (fC, j 10000 A / m, cathode ri3 Pb. Duration 1-2 hours possible

to obtain an activated concentrate, from which during subsequent leaching with a chloride solution (0.5 M CUC12. + 2 M NaCl + 1 M HCl, at 105 C)

97–99% C of l is recovered.

The disadvantage of this method is the long duration of the process, the loss of copper with the electrolyte and the considerable energy consumption.

0 The purpose of the invention is to intensify the process, reducing the loss of copper with electrolyte, reducing power consumption and isolating most of the sulfur in an elemental form.

5 The goal is achieved

the fact that an organic complexing agent of iron (III) from the group of organophosphorous compounds is introduced into the anode space, which is not mixed with electrolyte, and a chloride solution containing 1–2 M hydrochloric acid and 200–300 g / l calcium chloride is used as the electrolyte.

Tributylphosphine oxide is introduced as an organic complex of the co-agent with an organic phase: aqueous phase (1-20): 20.

During the electrolysis of chalcopyrite-containing pulp, complex sulfide decomposes in an acidic medium during the passage of a current through the phase boundary to form chalcocite and hydrogen sulfide is released by the reaction of 2CuFeS -b6H + 2e - Cu2S + 3HjS- -2Fe Migryr into the anodic space iron (1.) acid 2.4-Fe + e Chalcopyrite recovery is inhibited during the precipitation of iron salts in the pores of the product. Therefore, in order to eliminate the above disadvantages, an organically complexed iron complexing agent (.Sh.) is added to the anode space. As a result of the processing, the d layer is formed - organic and aqueous, with iron (S)) the organic phase is almost completely removed from the reaction system. When the acid concentration decreases below 1-2 M HC (without calcium chloride), the electrolysis intensity decreases by 30-40%, and an increase in the HC1 concentration causes complications associated with the use of aggressive solutions. According to X-ray and mineralogical analyzes, the activated residue is represented by three phases, with the main phase, KOZIN chal, the non-metallic part is represented by elemental sulfur. In addition, after activation, a small dolite is found in the residue. Example. The experiments were carried out in a laboratory electrolyzer. The cathode is a lead plate with an area of 32 cm. Anodic space is the jpT division from the cathode diaphragm. The anode is a grid of plates. The concentrate composition,%: copper 26.7, iron 28.7, sulfur 32.4, vis1 / 1ut 0.65, particle size 80% - 0.074 mm. Mineralogical composition,%: CuFeSi 82.3, 4.2, 5%. The electrolysis is carried out at a current density of 9800 A / m. After 1–5 min after the start of electrolysis, a 0.5 M solution of tributylphosphine oxide in benzene is introduced into the anode space at an equilibrium phase ratio of 0: B 1: (10–20). After completion of the experiments, the phases are separated in a separatory funnel. Iron is reextracted by treating the organic phase with water, after which it is analyzed by known methods. An activated concentrate in the amount of 3 g is leached with a chloride solution of composition 0.5 M CuCl, 2 M NaCl, 1 M HCI at 100 ° C. The results of the experiments are determined by the amount of iron that has passed into the solution, the amount of the initial and final dry products, and also by their structure using x-ray structural analysis. . The table shows the data on the effect of the electrolyte composition and the O: B phase ratio on the duration of the activation process and on the leaching of the activated residue with the chloride solution.

1 - 30 80 Without 32.6 20.9 complexing agents 1- 30 80 1:10 39.3 18.4 250 30 80 1:10 39.8 17.8 2 100 30 80 1:10 42.3 16.9 1200 30 80 1:10 12.5 16.3 2200 30 80 Without 40.8 17.4 complexing agents 33.3 2.160 81.3 32.3 1.640 86.4 31.6 1.610 88.6 32.6 1.540 95, 4 31.2 1.412 96.4 32.0 1.560 92.2

200

thirty

80

As a result of the electrolysis of chalcopyrite pulp using the chloride electrolyte of the proposed composition and the introduction of iron (III) complexer iron into the anode space, high quality copper is obtained, the copper content of which increases from 43-44 to 46-48%, the main part of pyrite sulfur is released in the elementary As a result, the activation time is reduced from 1–2 hours to 30 minutes, and the conventional power consumption is reduced from 0.75 kW g / kg to 0.64 kW g / kg concentrate.

Claims (2)

Invention Formula 1, A method of enriching and activating complex copper sulphides containing iron by pulp electrolysis in a chloride solution at elevated temperatures with the separation of the anode and cathode spaces by a diaphragm, characterized in that Table continuation 1:10 46.2 10.6 33.4 1.220 99.6 In order to intensify the process, reduce copper losses with electrolyte, reduce power consumption and release most of the sulfur in an elemental form, nesmeishvaktsiyts with an electrolyte organic complex of iron (S) from the group of organophosphorous compounds is introduced into the anode space, and chloride solution is used as electrolyte, containing 1-2 M hydrochloric acid and 200-300 g / l of calcium chloride. 2. A method according to Claim 1, characterized in that tributyl phosphine oxide is introduced as an organic component forming agent with the ratio of organic phase: aqueous phase (1-20) t20. Information sources, . taken into account in the examination 1. Transactions of the Institute Mining and HetaHurgy, c. 85 March, 1976, p. 23-28.