SU715900A1 - Copper powder drying method - Google Patents

Description

(54) METHOD OF SU11JI COPPER POWDERS

one

The invention can be applied in metallurgy. .

Known methods of drying powders in an environment containing inert gas 1

The closest to the invention to the technical essence is the method of drying copper powders in a gaseous environment 2 ..

A disadvantage of the known methods is that the copper powder after drying is very easily oxidized in air.

The purpose of the invention is to improve the quality of drying. This is achieved by the fact that according to the proposed method, stabilizer vapors are added to the gaseous medium, the adsorption rate of which on the copper powder leads to its oxidation rate, and the process is carried out at 100 ° C.

Benzotriazole is used as a stabilizer. The essence of the method is that the air is heated to 100 (below the drying is slow, above the partial oxidation of the Powder occurs), enrich with benzotriazole vapor and feed the mixture to dry the copper powder. Benzotriazole vapor, adsorbed on the surface of the powder, prevents it from oxidizing into changes in properties.

Example. Copper powder with a residual moisture content of 0–15% is dried with hot air in the presence of benzotriazole in a fluidized bed drying oven. The enrichment process is carried out as follows. The air heated to 200 ° C, the passage through the vessel with benzotriazole vapor, is enriched with it (5%) and enters the drying chamber. The wet powder in the chamber is blown underneath by a mixture of air with stabilizer vapors, dries quickly, acquires

5 pink color and removed from the drying zone. Dried powder for a long time retains all the working properties (specific surface, bulk density, fluidity, chemical composition, etc.).

0

The application of the proposed method makes it possible to combine drying and stabilization of the powder in one process. Drying speed is significantly higher than

5 with known methods. The presence of air in the drying unit does not impair the properties of the powder.

Claims (2)

Claims 1. Method of drying copper powder, 0 received by hydrometallurgic ggu 57159004 However, in a gaseous environment, about tl and h. And yu- Sources of information, hell and with, W6,. with daiShptZtye into account in the examination of the quality of drying, in a gaseous environment stabilizer pairs, speed1 are added. US Patent No. 3271873, adsorption of which on copper powder. 34-5, published. 1963. SchöyösKbrostiegb oxidation, and about 5 Cess is carried out at 100-350 C. 2. Nomberg MI, Production med2. The method according to p. 1, about tl and h of the s-th powder electrolytic with and with the fact that as a state. M., Metallurgists, 1974, benzotriazole. c. .