SU1677077A1 - Method of processing solutions containing arsenic and metal cations - Google Patents

Abstract

The invention relates to ion exchange methods for processing solutions and can be used for the disposal of process and waste solutions of hydrometallurgical production. The purpose of the invention is to reduce the process. The solution containing the mouse and the metal cations undergoing processing is passed through a layer of cation exchanger, then the solution containing the mouse k and 1-65 g / l of sulfuric acid is passed. At the outlet, the filtrates are combined and the mouse is disposed of by known methods. 3 tab.

Description

The invention relates to ion exchange methods for processing solutions and can be used for the disposal of process and waste solutions of hydrometallic industries.

The purpose of the invention is to reduce the cost of the process.

PRI me R 1. Processing solutions in a known manner.

For tests used waste solutions copper refining production, containing, g / l: copper 51,467; nickel 30.853; iron 0.3; mouse to 19.6; antimony 1.1; sulfuric acid 107.31; hydrochloric acid 0.3; hydrofluoric acid 0.3 (solution 1), and waste solutions of sulfuric acid production, containing 25.97 g / l of sulfuric acid (solution 2).

The experiments were carried out in a column with a height of a layer of KU-2 sulfonic cation exchanger swollen in water in hydrogen form 4 m. Solution 1 (experiment 1) or solutions 1 and 2 (experiment 2) were sequentially filtered at a rate of 2.36 m / h or sequentially, solution 1 and the first portion of sulfate filtrate, not containing a mouse, selected in a parallel experiment (experiment 3), then water to pH 17. At the exit of the layer, the filtrate was collected from the onset of acid leakage to pH 7. The filtrate was analyzed, the cation exchanger capacity was calculated on metals. At the end of the experiment, the metal cations trapped in the breakthrough were removed in an additional section of the column with cation exchanger. The filtrate was processed by known methods. The volume of the additional section was determined experimentally or theoretically on the basis of the volume of retention, which ensures the realization of DOE at a recovery rate of 100%. The cation exchanger in the mixed salt form was treated with a stripping solution, the eluate was analyzed, the capacity of the cation exchanger in the main column was calculated. The results are shown in Table. one.

As can be seen from the table. 1 data, a known method provides the utilization of sulphate solutions at their

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co-processing with solutions containing mouse cations and metal cations,

PRI mme R 2. Formation of the tail fraction of the filtrate in the layer of cation exchanger.

Experiments were performed under conditions similar to those shown in example 1, experiment 1. Solution 1 (initial) and waste solution containing 44.8 g / l of sulfuric acid and 2.1 g / l of mouse (solution 2) were used for the tests. In experiment 1, solution 1 was filtered through a layer of cation exchanger in H form. In experiment 2, solution 2 was filtered through a layer of cation exchanger in mixed salt form previously washed with water after saturation in experiment 1. In both tests, filtrates were collected at the exit of the layer, from which the tail fraction was isolated from the beginning of the decrease in the concentration of sulfuric acid (the beginning of washing out) to the absence of acid in the filtrate (pH 7). The volume of the filtrates was measured and analyzed. The results are shown in table 2.

As can be seen from the above examples, the volume of the tail fraction and the distribution of components in the tail fraction do not depend on the composition of the solution being filtered. This eliminates the possibility of disposal of diluted mouse-containing solutions (for example, solution 2) in the tail of the process of extracting metals from solutions with a high content of components (for example, solution 1) by a known method, since the tail fractions of these solutions are equal in volume.

PRI me R 3. Processing solutions proposed method.

Experiments were performed under conditions similar to those given (example 1). In experiments 1-12, solution 1 was successively filtered through a layer of cation exchanger (the composition according to example 1) and a recyclable solution 2 containing, g / l: sulfuric acid 1.0-71.3; mouse to 0.1-26.0; Antimony 0.1-0.23, In experiment 13, the first portion of the filtrate from solution 1 containing sulfuric acid and mouse K and obtained in a parallel experiment was used as solution 2 (in the tail of the parallel experiment, the first portion of experience 13 was utilized). The filtrate was analyzed, divided into two parts and processed by known methods. The first part was used to remove the arsenic with sulphide reagents. The filtrate was treated with a sulphide reagent until the arsenic sulphide precipitated. The residual content of the mouse in the solution is 0.12 g / l. The mother liquor after separation of the precipitate was analyzed. The results of the analyzes were calculated as the recovery rate. The second part of the filtrate was evaporated to a mouse content of 100 g / l and arsenic oxide was precipitated with sulfur dioxide.

According to the analysis of the solutions and the measurement of their volumes in the process of evaporation, the cost of processing was calculated according to this limit. In the control experiments by a known method, a solution for disposal was prepared by mixing solution 2 with the appropriate proportions (without filtering it through a layer of cation exchanger, since the prototype eliminates this operation) and filtrate solution 1 obtained by the known

way (experiment 1, example 1). The resulting solution was divided into two parts and processed similarly to the filtrate of the proposed method. Table 3 presents data on the composition of the solution 2 and the filtrate obtained by the proposed method, and also compares the efficiency indicators of processing the combined filtrate (the proposed method) and the mixture of the filtrate solution 1 with the mouse-containing solution being disposed of (known method).

As shown by the test results, sequential filtering of solutions 1 and 2 leads to a cheaper process of utilization of the filtrate and solution 2 and an increase in the recovery rate from 98.54-99.03% to 98.82-99.19% regardless of the concentration of the mouse in the solution 2 and its volume. With an increase in the acid concentration in the solution of 2 to 71.3 g / l (experiment 12),

reduction of the capacity of the ion exchanger as a result of the desorption of metals with recyclable solution

Claims (1)

Thus, the proposed method provides a reduction in the volume of the processed filtrate to 0.8-1.0 b.ob., against 0.92-1.02 b.ob. by a known method or by 1.96-13.04% with a corresponding reduction in equipment and production space, as well as a reduction in the process by 18.42-24.86%. Invention Method for processing solutions containing mouse and metal cations, including filtering through a layer of cation exchanger transfer of metals into the cation exchanger phase and utilization of the mouse to the containing filtrates, characterized in that, in order to reduce the cost of the process, the initial the solution containing the mouse and metal cations, and the solution containing the mouse and 1-65 g / l of sulfuric acid, at the exit of the layer, the filtrates are combined and disposed of. Table 1 table 2 Capacity is 88.2 mg / g. Capacity is 87.9 mg / g. Table 3