SU1010156A1 - Method for processing sulfide concentrates and intermediate products - Google Patents

Abstract

A process for the treatment of sulfide concentrates and industrial products containing non-ferrous and rare metals, including leaching them with a solution containing sulfuric acid, characterized in that, in order to reduce production costs and simplify the process, the processing of the sulfide product is carried out with a solution of 70-80-sulfuric acid, in which urea is additionally introduced, 0 kg / ton of product at 130-1iO ° C, followed by leaching the cooled product with water at a solid-liquid ratio of 1: (3) and 35 ° C.

Description

Ate 110 The invention relates to hydrometallurgy, in particular to the field of attraction of non-ferrous and rare metals from sulphide concentrates and pressed products. There is a method of processing dry feed ores containing non-ferrous metals, including leaching them with a solution of ferric chloride in an acidic medium in the presence of materials containing manganese dioxide. The disadvantage of this method of processing is the presence of a high concentration of chloss salts of the south manganese iron, which make it difficult to further process the solutions l J. The closest to the proposed technical cy and the achieved result is a method of processing sulphide concentrates and middlings containing non-ferrous and rare metals, including leaching them with a solution containing hydrochloric acid 2. The disadvantage of the known method is the use of expensive reagents, such as ammonium persulfate, Trilon 5, high residual acidity of the solution, which overwhelms the further reprocessing of the solutions. The purpose of the invention is to reduce production costs and simplify the process. The goal is achieved by the fact that according to the method of processing sulphide concentrates and middling; containing non-ferrous and nonferrous metals, including leaching them with a solution containing sulfuric acid, the sulfide product is treated with a solution of sulfuric acid jB which additionally supplies urea in an amount of П ,, 0 | 5 kg / ton of the product at 130- with the following leaching of the cooled product with water at a solid-to-liquid ratio of 1; () and At a concentration of sulfuric acid of less than 70 does not occur — a rather strong sphalerite lattice is destroyed. and to a smaller reaction surface, moreover, when heated, it is more concentrated. The acid decomposes according to the equation: 2NLZO, - + 2GO., + 0, / h- Z. 2, which can lead to its unreasonably increased consumption. Temperature 130-1 (found method planned Experiment for a better oxidative effect of sulfuric acid. At temperatures below 130 ° C, elemental sulfur closes the surface of the particles and slows down the reaction. At temperatures above 140 ° C, sulfuric acid decomposes according to the equation: 2Н 30 2Н20 + 2S02 + Oj, and zinc extraction decreases. The urea flow rate of 0, kg / t is calculated to form a monomolecular layer on the surface of the particles. A lower flow rate does not give a sufficient effect, since not all sphalerite particles are covered with a urea layer. A urea consumption of more than 5 kg / t leads to a deterioration in the process, since sulfuric acid is consumed for the decomposition of urea and the reaction products shield sphalerite particles, which leads to a decrease in the extraction of zinc into the solution. Leaching parameters are determined by the fact that, with a small ratio T; G 1: 1 1: 2, there is not enough contact between the product and the leaching medium, with a large T: M 1: 5 hydrolysis of the leaching products occurs, as a result of which the surface of the mineral is covered with a thick film of basic salts, which prevents further dissolution of the main component. The leaching temperature should not be higher than -lO C, since the leaching of exothermic sulfates / 1 with increasing temperature, the solubility of zinc sulfate drops, to the fact: & during the cygnetization process, precipitation of the MDC ions from the solution onto the product surface occurs, which also leads to a decrease in the extraction of zinc into the solution. The cooling temperature of less than 35 leads to a decrease in the extraction of zinc into the solution, since the solubility of salts decreases as the temperature decreases. The method is carried out as follows. In the amount of the product, 100 g are mixed with a certain amount of crystalline urea and a solution of sulfuric acid of a given concentration and heated to a defined divided temperature for a certain time. Then leaching the cooled product with water for a certain time, filtering and washing the precipitate, the solution and the solid residues are analyzed for content: Cu, Zn, Fe, NlZO. Example 1. To determine the optimal concentration of sulfuric acid, decomposition experiments were performed. copper-zinc product at a concentration of sulfuric acid from 20 to 90 6 - .4 With a constant consumption of the latter, equal to 0 g. Table. 1 presents the results of the processing of copper-zinc product at different concentrations of sulfuric acid. The amount of acid is “Оg, temperature of treatment with acid, time of treatment with acid BO min., Leaching with water at, temperature 0 ° С, 20 min. 1 T a l and c, and 1 i

As follows from Table 1, the highest zinc extraction is achieved at a concentration of sulfuric acid. With an increase in the concentration of sulfuric acid over 80%, the extraction of zinc in the solution is

PRI me R 2. To determine the optimum temperature for treating a product with sulfuric acid, experiments were carried out in which the temperature of mixture A varies from 25 to.

In tab. 2 presents the results of the processing of copper-zinc product at different temperatures of treatment with sulfuric acid.

The amount is. g, concentration 80%, acid treatment time 50 min, leaching with water at T: W:, temperature kO ° C, 20 min.

As follows from the table. 2, the greatest extraction of zinc is observed at the processing temperature of the product 1301 0 С, it is not advisable to raise the temperature of the mixture above, since the increase in the extraction of zinc decreases slightly with increasing temperature, and the decomposition process deteriorates at a lower temperature.

EXAMPLE 3 In order to determine the optimum leaching temperature, experiments were carried out on the processing of a copper-zinc product at that table. 2 (

The temperature of the leaching medium is 25,100 ° C.

In tab. 3 presents the results of the processing of copper-zinc product at different temperatures you

alkalinizing the treated product with water.

The amount of 80 is 40 g, the temperature of acid treatment is C, the treatment time is acid 50 minutes, the leaching with water is a ratio T:} {1: 4 to 20 minutes.

, T 9 b l and c a 3

16M 1.33

73.28, 4,121,11A1, 21

73,3,091,11iifl, 26

As follows from the table. 3, the leaching of 2n is most effective at temperature C, with a decrease in temperature. extraction of zinc and copper, so leaching the treated product can be done without external heating due to the exothermic dissolution of sulfates. At lower temperatures, the solubility of salts also decreases,

PRI me R. To determine the optimal ratio of solid to

From tab. it follows that diluting the solution with more than the ratio does not follow, as further extraction of metals from the more dilute solutions will complicate, and the salts are not sufficiently dissolved.

Example 5: To study the effect of the amount of urea on the degree of zinc extraction in the solution of the copper-zinc product

eight

1010156 Continuation of the table. 3

liquid experiments were carried out at a ratio of T: W 1: 1 - 1: 5.

In tab. 4 presents the results of the processing of copper-zinc product at a different ratio T: W.

Amount 80 is to g, acid treatment temperature is 140 ° C, acid treatment time is 5 min, leaching with water at kO ° C for 20 min,

;Table

experiments with different amounts of urea added to the solid product along with sulfuric acid.

Table 5 shows the results of processing copper-zinc product with different amounts of urea. The amount of 80 is 40 g, the treatment time is 50 minutes, the treatment temperature is H250 l. -, leaching with water at, 1 :, temperature 40 С 20 min.

1010156

As follows from the table. 5, the best. Zinc recovery results are observed when using O.Ot-S kg / ton of urea starting material at 1 :.

With an increase in the amount of urea, a decrease in the extraction of zinc into the solution is observed, with a consumption of urea less than 0.0 kg / t, the effectiveness of its effect decreases markedly.

Thus, from table. 1-5 we can conclude that the conditions found

10 Table В

processing of copper-zinc product (concentration of HgSO 70-80, the amount of added urea 0, kg / t,

The processing temperature of the material with acid and urea TZO-YO s, leaching of the product with water at a ratio and temperature c) is such that sulfur

acid acts not only as a solvent, but is also a mild oxidizing agent capable of oxidizing sulphidic sulfur to. Residual acids;

11101

The solution after leaching with water is low, which is facilitated by the introduction of urea into a solid product before its treatment with acid.

The application of the method allows to significantly reduce the cost of processing sulfide raw materials in comparison with the prototype due to the replacement of reagents, since the cost of urea is many times less than the cost of persulphate, trilon B and urotropine. Ras0 56.12

The stages for these reagents in the prototype are 25.643 rubles / ton of product, according to the proposed method, the cost of urea at the maximum flow rate

5 5 kg / ton is 0, (65 rubles / ton. In addition, the low residual acidity and low iron content in the solution simplify the processing technology of the solutions, since

10 is much less reagents for neutralizing and cleaning solutions from iron and other harmful impurities.

Claims (1)

METHOD FOR PROCESSING SULFIDE CONCENTRATES AND PRODUCTS containing non-ferrous and rare metals, including leaching them with a solution containing sulfuric acid, characterized in that, in order to reduce production costs and simplify the process, the treatment of the sulfide product is carried out with a solution of 70-80% sulfuric acid in which urea is additionally added 0.045 kg / t of product at 130-140 ° С followed by leaching of the cooled product with water at a ratio of solid and liquid 1: (3 “4) and 35 40 ° С. R SS a Joint venture 1 1 01 about