JPS6289888A - Method for electrodepositing high purity manganese from manganese amalgam - Google Patents

Abstract

PURPOSE:To electrodeposit high purity metallic manganese on the cathode and to collect it efficiently by carrying out electrolysis with manganese amalgam as the anode and stainless steel plates as the cathode. CONSTITUTION:Discoid amalgam raising plates 12 and semicircular stainless steel plates 14 as the cathode are arranged opposite to one another in a vessel 10, an electrolytic soln. 16 is filled into the upper part of the vessel 10 and a pool of manganese amalgam 18 as the anode is formed at the lower part. When the raising plates 12 are rotated, they are wetted with the manganese amalgam 18 to raise vertically the manganese amalgam 18 and to form specular anode surfaces. At the same time, the manganese amalgam 18 is agitated. Electrolysis is then carried out. High purity metallic manganese is electrodeposited on the cathode with about 55-65% current efficiency. The electrodeposited manganese is stripped, washed, dried and reutilized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for electrodepositing high purity manganese metal using manganese amalgam as an anode. Generally, electrolytic winning of metals is carried out using a carbon electrode or ship type as an anode, but the present invention is characterized in that a manganese amalgam is used as an anode. As in the present invention, electrolysis is performed using manganese amalgam as an anode and a stainless steel plate as a cathode,
Conventionally, no method has been found to electrodeposit high-purity metal manganese on the cathode.

Various types of dust, which are intermediate products from the process of smelting conventional technology metals,
Ti, waste liquid, and various metal-containing substances that are discarded once on the market include many that can be reused as metal resources. In this regard, there is room to consider not only how to treat trace amounts of mercury but also how to treat large amounts of manganese, but so far no effective method for recycling manganese has been found. .

The present inventor came up with the present invention as a particularly suitable method for collecting used dry batteries in large quantities and recycling manganese.

Problems to be Solved by the Invention An object of the present invention is to provide a method for efficiently extracting high-purity metallic manganese from secondary metal resources.

Means for Solving the Problems and Their Effects The above-mentioned object of the present invention is to produce a manganese solution, which is characterized by electrolyzing a manganese amalgam as an anode and a stainless steel plate as a cathode, and electrodepositing high-purity metallic manganese on the cathode. This is accomplished by electrodepositing high-purity metal manganese from amalgam.

Manganese amalgam can be produced by diaphragm electrolysis from a manganese chloride aqueous solution, etc., from which copper, lead, cadmium, zinc, etc. have been removed by a known method that takes advantage of its ionization tendency. Manganese dioxide contained in dry batteries can be easily converted into manganese chloride aqueous solution and the like.

Next, examples will be shown.

Example A manganese chloride aqueous solution was prepared with a pH of 1 to 2 and a manganese concentration of 5 to 2.
10 g/It, current density 0.5 A/dva", electrolysis temperature kept at 25°C (room temperature), carbon as an anode, mercury as a cathode, unglazed cylinder as a diaphragm, manganese concentration 0.1% by diaphragm electrolysis method. Three concentrations of manganese amalgam were prepared: , 0.5%, and 1%.

Subsequently, three different concentrations of manganese amalgam were injected into the apparatus shown in FIGS. 1 and 2, and electrolysis was performed.

In the figure, a disc-shaped amalgam lifting plate 12 and a semicircular cathode-side stainless steel plate 14 are arranged facing each other in a container 10, and an electrolytic solution 16 is housed in the upper part and a manganese amalgam pool 18 is housed in the lower part. At the bottom of the container 10, a raised-bottom block 20 as shown in the figure is arranged in order to reduce the amount of mercury used (this block may be removed during industrial mass production). A motor 24 is connected to the central shaft 22 of the manganese amalgam lifting plate 12 so that it can rotate. By rotating the lifting plate 12, the anode manganese amalgam 18 is lifted up by the lifting plate 12.
The surface will be wetted like a mirror, and the manganese amalgam will stand up vertically as an anode surface. At the same time, the action of stirring the manganese amalgam is also performed. The lower end of the copper wire 26 is immersed in the manganese amalgam 18.

Using this device, manganese concentrations of 0.1%, 0.5%,
1% manganese amalgam respectively, electrolyte composition Mn
10-18g/j! , (NH4)tsO4120~
140g/iPH8.1~8.4, temperature 34~37℃,
Voltage approximately 0.2 V, current density 3.0-4.5 A/dII
l! , anode manganese amalgam, lifting plate rotation speed 1
When electrolysis was performed using the cathode stainless steel plate at one revolution per minute, high-purity metal manganese was electrodeposited on the cathode with a current efficiency of 55 to 65%. At this time, a very small amount of HtSOs solution was added to prevent oxidation of the electrolyte.

Furthermore, similar results were obtained when electrolysis was carried out by changing the rotational speed of the lifting plate to 1 and 2 rotations per minute.

That is, according to the method of the present invention, manganese amalgam was used as an anode, and high purity metallic manganese could be deposited on the electrode plate on the cathode side. If the high-purity metal manganese on the electrode plate is peeled off, washed with water, dried, and accumulated, it can be reused as a new resource.

As described in detail, according to the present invention, high-purity metallic manganese can be efficiently extracted from secondary metal resources.
Its effects are extremely remarkable, such as the discovery of effective ways to utilize used dry batteries.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an electrolytic apparatus for carrying out the method of the present invention, and FIG. 2 is a side sectional view taken along line A--A in FIG. 10... Container 12... Amalgam lifting plate 14... Stainless steel plate 16... Electrolyte 18... Manganese amalgam

Claims (1)

[Claims] A method for electrodepositing high-purity metallic manganese from manganese amalgam, characterized by electrolyzing manganese amalgam as an anode and a stainless steel plate as a cathode, and electrodepositing high-purity metallic manganese on the cathode.