SU1527323A1 - Method of producing mercury-manganese alloy - Google Patents

Abstract

The invention relates to metallurgy and can be used to produce an alloy based on mercury by electrolysis of a manganese salt on a mercury cathode. The purpose of the invention is to improve working conditions and reduce energy costs. The goal is achieved by adding metallic indium in the amount of 11–50% to the heterogeneous manganese amalgam obtained at the mercury cathode containing the MN ₂ HG ₅ alloy. The separation of the liquid and solid phases to produce the MNHG alloy takes place without preheating (at room temperature), which reduces the rate of mercury evaporation by two orders of magnitude. 1 tab.

Description

The invention relates to metallurgy and can be used to produce an alloy based on mercury, by electrolysis of a manganese salt on a mercury cathode.

The purpose of the invention is to improve the conditions of the pipe and reduce energy costs.

According to the method, the manganese salt is electrolyzed on a mercury cathode to form a heterogeneous amalgam, metallic indium is added to the obtained amalgam in an amount of 11-50% by weight, after which the liquid and solid phases are separated by filtration.

The method is carried out as follows.

Heterogeneous amalgam is obtained by precipitating manganese from a solution of manganese sulphate, using an electrolytic cell to separate the electrode spaces, and the solution and mercury are mixed. Kssichest- - introduced into mercury is controlled by the concentration of manganese ions in solution after electrolysis.

Indium is added to the special amalgam manganese obtained in this way, the metal mixture is stirred for 30 minutes to complete the reaction between the components in the amalgam. During this time, an MnHg alloy is formed in the manganese-indium amalgam. After that, most of the liquid amalgam is drained, leaving a pasty mass, which is washed with water, dried with filter paper, transferred to a cup of filter paper, and placed in a mold.

The solid residue remaining after removal of the liquid phase is an alloy of MnHg, which is analyzed

metol chemical and x-ray phase analysis. Chemical analysis — trilonometric titration of the manganese solution is carried out after complete electrolytic decomposition of the MnHg alloy in 0.1 M sulfuric acid. The remaining mercury after decomposition of the alloy is weighed. X-ray phase analysis was performed on a DRON-0.5 x-ray diffractometer.

Example. An aqueous solution of manganese sulphate containing 1.1 g of manganese is poured into the cathode space of the electrolytic cell (the anode and cathode spaces are separated by a semipermeable cellophane septum), and 200 g / l ammonium sulphate is added to the anode space. Electrolysis at a controlled potential (-1.6 V relative to the saturated calomel electrode) is carried out using a potentiostat P-.5827. The solution and amalgam are stirred with a stirrer. At the end of the electrolysis, the residual manganese content in the electrolyte, determined by the method of trilonometric titration, is 0.1 g, therefore, 1 g of manganese is introduced into the mercury.

To the amalgam thus obtained, which is in the electrolytic cell with the former electrolyte, 8.3 g of indium metal is added and the amalgam is stirred for 30 minutes to completely dissolve the indium in mercury. After that, the metal mixture is washed with distilled water, most of the liquid phases are drained, and the remaining thick mass is dried with filter paper, transferred to a cup of filter paper, placed in a mold, and pressure is applied to 1-10-10 kgf / cm. The liquid portion of the amalgam is filtered off, and the remaining solid portion in the form of a tablet consisting of paper and alloy is moistened with a small amount of distilled

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water, remove the paper, separate it from the alloy, and analyze the resulting alloy.

Variants of the method with the introduction of various amounts of indium into the amalgam are shown in the table.

If less than 11 is added to indium manganese amalgam, not all of the Mn / jHg alloy is converted to MnHg (experiment k). If indie added more than 50%, then part of it precipitates and it is in the form of an impurity is part of the alloy. MnHg (experiment 5).

After separation of the solid alloy, the liquid phase, which is mainly indium amalgam (with a small admixture of manganese), separated from the heterogeneous manganese-indium amalgam (with a small admixture of manganese) can be used Yuvtorno to obtain the MnHg alloy. In this case, not metallic indium is added to the heterogeneous manganese amalgam, but an indium amalgam is already prepared.

In contrast to the known method of producing an MnHg alloy, the need to preheat the metal mixture to 90 ° C is eliminated - the process is carried out at room temperature, which reduces energy costs, reduces the rate of mercury evaporation by two orders of magnitude, which is due to improved working conditions.

Claims (1)

The invention The method of producing an alloy of mercury-manganese, comprising the electrolysis of manganese salt on a mercury cathode with the formation of heterogeneous amalgam and the subsequent separation of liquid and solid phase-filtration under pressure, ex. So that, in order to improve working conditions and reduce energy costs, before separating the liquid and solid phases, indium is introduced into the amalgam in an amount of 11-50% by weight. Editor V. Petrash Compiled by V. Badovsky L. L. Oliynyk Proofreader I. Muska Order 7 8b / 37 Circulation 605 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab., K / S Production and Publishing Combine Patent, Uzhgorod, Gagarin st., 101 Subscription