SU1243907A1 - Method of producing copper powder by electrolysis - Google Patents

Description

The invention relates to powder metallurgy, in particular, to methods for producing copper powder by electrolysis.

The aim of the invention is to increase the productivity of the electrolysis process, increase the dispersion of the powder and facilitate servicing of the electrolysis baths by extending the period of continuous powder buildup at the cathode.

Example 1. In the electrolysis bath pour the electrolyte of the following composition, g / l:

Anhydrous copper sulfate 25 Sulfuric acid 140 A cylindrical copper cathode with a diameter of 1.2.10 and two copper anodes with a 1:12 ratio of the working surface of the cathode and the surface of the anodes hang up the bath. A linearly varying voltage is applied to the cell, providing a linear change in the cathode current density from 300 to 4400 A / m at a speed of 410 A / m.h for 10 hours. The initial value of the current density 300 A / m is the value of the limiting deposition current density copper from the electrolyte of this composition ..

The electrolysis is carried out continuously at an electrolyte circulation rate of 0.8 l / h and a temperature. The powder is not strewn from the cathode during the entire electrolysis process.

Example2. The following electrolyte is poured into the electrolysis bath; its composition, g / l:

Anhydrous copper sulfate 30 Sulfuric acid1 40

A lymphatic variable voltage is applied to the bath, providing a free cathode current density, A / m

300-4400 380-5455 480-4545 1700

Concentration C g / l

2 +

ten

Current sweep speed, A / M-, H

410

linear change in current density from 380. to 5455 A / m

2000 A / m -, h.the flow of 2.54 h. The initial value of the current density is -

with the value of the limiting current density of copper deposition from the electrolyte of dal composition. The remaining conditions of the electrolysis process are the same as in Example 1.

Example, the electrolyte is poured into the electrolysis bath following; its composition, g / l:

Anhydrous copper sulfate 40 Sulfuric acid1 40

A linearly varying voltage is applied to the bath, providing a linear change in the cathode current density from 480 to 4545 A / m at a speed of 2000 A / m, h for 2.03 h,

The initial value of the current density of 480 A. / M is the value of the limiting current density of copper deposition from an electrolyte of a given composition. The remaining conditions of the electrolysis process are the same as in example 1,

The results of the experiments are given in table., 1,

Justification of the boundary values of the proposed intervals of maximum

current densities are given in Table 2, and change rates, current densities are shown in Table 3.

As follows from the data presented, the proposed method for obtaining copper powder, as compared with the prototype method, improves the performance of the electrolysis process and the dispersion of the powder, as well as facilitates the maintenance of the electrolysis baths by extending the period of continuous powder growth at the cathode

Table 1

12

sixteen

12

2000

2000

The interval of removal of the powder, h

Content in% fraction with particle size, microns:

4100 5500 4400 1700

Continuation of table 1

2.54

2.03

1.17

Table 2

ProposedMeditor M. Bandura

Compiled by N. Tumin Tehred O. Gortvay

Order 3749/14 Circulation 757

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Tab faces

Proofreader L. Pilipenko

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Claims (1)

METHOD FOR PRODUCING COPPER POWDER BY ELECTROLYSIS from sulfate electrolyte, characterized in that, in order to increase the productivity of the electrolysis process, increase the dispersion of the powder and facilitate the maintenance of electrolysis baths by lengthening the period of continuous growth of powder at the cathode, the electrolysis is carried out at a linear speed varying from 410-2000 A / m ² . h of current density in the range from the minimum, determined by the value of the limiting current density of the deposition of metal from an electrolyte of the selected composition, to the maximum, in the range 4100-5500 A / mV SU „1243907>