SU386711A1 - METHOD OF OBTAINING METAL POWDERS BY ELECTROLYSIS - Google Patents

Description

The invention relates to the production of metal powders by electrolysis. A known method of obtaining metal powders by electrolysis in a two-layer bath, the lower layer of which is an aqueous solution of a metal salt, and the upper one is a solution of surface-active suspension in a hydrocarbon medium, the electrolysis process taking place on the growing cathode using an electrolysis pulse. The purpose of the invention is to obtain particles, powders with a ratio of length to their diameter of not less than ten. This is achieved by the fact that the process is carried out after filling the upper layer with the components of the lower layer in the electrolyte with the concentration of the metal salt in the solution 0.5-500 g1l, pH, equal 1-10% 2-10, at a temperature of 5-100 ° C at the next pulse mode electrolysis: Pulse duration s, Duty rate 1.05–1000, Amplitude density 10–8–103 A / cm – 2 current B, a cylindrical glass electrolyzer with an inner diameter of 110 JAM and a height of 140 mm. Pour an aqueous electrolyte solution in an amount. 400 ml, which is a solution of ferric chloride with a concentration of 30 g / l, pH 3.5, at 20 ° C. An anode of Armco iron, made in the form of a half cylinder 50 SA.M. wide, is placed at the bottom of the vessel. with an internal radius of 45 km. and 4 mm thick, having a fluoroplastic-insulated core pin serving as a current lead. On the surface of the electrolyte pour a layer of 0.35 wt. % solution of oleic acid in toluene in the amount of 50 ml. The cell is covered and held for 70 hours to saturate the upper layer with the components of the lower layer of the bath. Then it is placed; the cathode, which is a nickel disk with a diameter of 52 mm and a height of 0.5 mm and fluoropolymers insulated bases, is lowered by 6 mm below the interface: hydrocarbon medium — an aqueous electrolyte solution, and is rotated with a speed of 2.7 rev. A pulse voltage is applied to the bath with the following. Parameters: Pulse duration, 4-10 sec. Repetition period 0.0011 sec. Pulses Front Duration 9.2-10-5 sec Pulse Edge Rear 0.5-10 sec Pulse Front Duration

Amplitude value of a current in a pulse 0,2 ma

Amplitude value of the bride

on bath 0.7 in

After three hours of operation of the bath, the electrolysis process is stopped, the powder is removed from the upper layer and subjected to its electrolytic, microscopic and solvent.

0, b, on the contrary, that the powder is 60- 90% of the particles of the filamentous form with potreche

NIKOM is 200-1000 A and the ratio of the length of the particles rK to their cross-section is not less than ten.

Subject invention

The method of obtaining metal powders by electrolysis in a two-layer bath, the lower

The LAYER of which is an aqueous solution of a metal salt, and the top layer is a solution of a surfactant in a hydrocarbon medium, with the use of a pulsed electrolysis mode, characterized in that, in order to obtain particles of powders with a ratio of length to their diameter not less than ten, The process is carried out after saturating the upper layer with the lower layers of the electrolyte with the concentration of the metal salt in the solution 0.5-500 g / l, pH 2-10, or 5-100 ° C with the next imiulane. electrolysis mode:

The duration of the pulses is 10 -1 sec.

Durability 1.05-1000

Amplitude current density of 10- -10 A / cm.