SU1411348A1 - Method of cleaning zinc solutions of iron (ii) and manganese (ii) - Google Patents

Abstract

The invention relates to hydrometallurgy of non-ferrous metals, in particular to the purification of zinc solutions from impurities of iron (II) and manganese (II). The purpose of the invention is to improve the quality of the purified solution and reduce the cost of the process. Purification is carried out with medium zinc sulphite with mechanical stirring for 2-3 hours. Table 2.

Description

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The invention relates to hydrometallurgy of non-ferrous metals, in particular to the purification of zinc solutions of JOT impurities of iron (II) and manganese

Ia (II).

I The purpose of the invention is to increase the quality of the cleaned solution and reduce the cost of the cleaning process.

{PRI me R 1. The initial solution contains, g / l: Zn 165; Fe 4.05; Mn j3.58. This solution is purified from Fe (II) PI Mn (II) by the proposed method at room temperature, using the average zinc sulfite ZnSOj. 2.5H20 obtained by bubbling sulfur dioxide through an aqueous suspension of zinc oxide,

The initial solution is poured into a 1 L glass beaker and, when refluxing with a mixer, the medium sulfite powder is added to the solution in an amount equal to 100% of the stoichiometric required for complete precipitation of iron and manganese in the form of | medium. sulfites. After stirring the suspension for 2 hours, the solution is filtered, in which the residual concentrations are established: -, g / l: Fe 0.69; Mp 1.44. This COOT corresponds to the degree of precipitation of impurities,%: Fe 83.0; Mn 59.8.

The results of example 1 and similarly complete examples 2-10 purification of the proposed method from Fe (II) and

to (ii) ZnSQ solution, which is withdrawn from cadmium production, under various conditions, is given in Abl. one.

Given. In table. 1 examples 1-4 Completed under the proposed conditions, c- examples 5-10 - under the conditions, output - Dih beyond the limits proposed. In Examples 1-4, as a result of cleaning the solution by the proposed method, the residual concentrations of Cp are 41.0 g / l and Cd. 1.5 g / l, which is sufficient to obtain zinc sulfate of the required quality by evaporation of the solution.

From the results of examples 5-7 can be seen

that the treatment of the initial solution with zinc sulfite for 1 h is not enough to achieve the necessary residual impurity concentrations even with an increase in the precipitant consumption up to twofold.

From the results of examples 8-10, it is clear that the increase in the processing capacity

a solution with a precipitant up to 5 hours does not cause a significant improvement in the results as compared to the results obtained by treatment for 3 hours (experiments 8 and 1, 9 and 2, 10 and 3).

Example 11. The initial solution is the ZnSO solution obtained in the laboratory as a result of high-temperature (95 s) high zinc cake melting with spent zinc electrolyte, then depressing Fe (III) to Fe (II) by treating the solution with zinc sulphide concentrate and subsequent neutralization zinc calcine solution and cementation cleaning it from Cu, Cd, Ni and Co. The initial solution used for the purification contains, g / l: Zn 126; Fe 18.6; fa 8.0. The average zinc sulfite consumption is 150%. The temperature of the solution during the purification of Fe (II) and Mn (II) is maintained at 40 or 70 ° C (the limiting values of the temperature of zinc production solutions at the stages of neutral scaling of the calcine and cementation of the copper-cadmium cleaning solution.

In a glass conical flask, closed with a stopper through which the stirrer rod passed, and placed in a water bath, the thermostat contains the initial solution. Medium zinc sulfite powder in the amount of 150% of the stoichiometric iron and manganese necessary for complete precipitation is loaded into the solution with stirring. After stirring for 2 hours, the solution is filtered off, in which the residual concentrations of the prises are set, g / l: Fe 1.19; Mp 1.41. This corresponds to the degrees of precipitation, rel.%: Fe 93.6; MP 82.4.

The results of example 11 and similar to the performed examples 12-19 of the purification by the proposed method of Fe (II) and Mn (II) ZnSO solution obtained by temperature-wise drying by zinc cake followed by neutralization and cementation purification of the solutions under different conditions at a precipitator consumption 150 7 are given in table. 2

Given in Table. 2, Examples 12-15 are performed under the conditions proposed and Examples 16-19 under conditions beyond those proposed.

314

In examples 12-15 as a result of cleaning the solution by the proposed method, the residual concentrations of С i1.0 g / l. It is enough that during the hydrolytic purification of such pactBopa there is no difficulty in clarifying the solution with a sponge and in filtering the clarified solution. The residual concentrations of manganese, both in these and in other examples, are sufficiently small for the main technological purpose. In this case, the accumulation of manganese in the circulating zinc plant is prevented.

From examples 16 and 17 it can be seen that the treatment of the initial solution with zinc sulphite for 1 hour is insufficient to achieve the required residual iron concentration. And from examples 18 and 19 it can be seen that an increase in the duration of cleaning the solution to 5 hours does not cause a significant improvement in the purification from iron as compared with the proposed duration of 3 hours (examples 18 and 14, 19 and 15).

From the comparison of the data given in Table. 2, it follows that within the range of 40-70 ° C there is no significant

influence of temperature on the cleaning process.

Thus, when using the proposed method, a significant reduction in the content of iron (II) and manganese (II) impurities in zinc solutions is achieved if their content is high. Since the solutions to be purified are not contaminated with extraneous impurities (sodium), their quality is improved. The precipitant used can be obtained at the consumer plant. Cheaper process is achieved by conducting it without heating, as well as through the use of a cheaper precipitator.

Claims (1)

Invention Formula The method of purification of zinc solutions from iron (II) and manganese (II), including the precipitation of iron and manganese, followed by the Shch1M separation of the precipitate from the purified solution, characterized in that, in order to improve the quality of the purified solution and reduce the cost of the process, the deposition is carried out by medium zinc sulfite with mechanical stirring for 2-3 hours Table 1 3 3 2 3 1 1 1 5 5 5 100 120 150 150 100 120 150 100 120 150 Table