SU846950A1 - Rotary electric furnace for producing metallic powders - Google Patents

Description

(54) ROTATING ELECTRIC FURNACE FOR METAL POWDER PRODUCTION

I

The invention relates to powder metallurgy, in particular, furnaces for the production of metal powders, reduction of chemical compounds.

A rotary electric furnace is known, comprising a heat insulating body with a heating chamber, a rotating pipe, loading and unloading devices, a pipe rotation drive and spiral heaters installed in refractory plates tl.

However, the laboriousness of the repair work is significant due to the lack of the possibility of replacing heaters without a complete disassembly of the furnace.

Closest to the proposed technical essence and the achieved effect is a rotating electric furnace for the production of metal powders, including a heating chamber located in a housing, a rotating tube, a loading and unloading device inside the chamber. In this case, the heating chamber is made in the form of refractory plates, on the inner surface of which heaters | j2j are installed. The disadvantages of this furnace include low service life and considerable labor-intensive repair work.

The purpose of the invention is to increase the service life and reduce the laboriousness of repair work.

The goal is achieved by the fact that the heating chamber is made of collapsible refractory blocks equipped with a metal slide, each of the blocks is made in four sectors, while the surface of the blocks facing the pipe is cylindrical, and the casing is provided with side windows located

20 is coaxial with oneupornous blocks.

Claims (2)

Fig. 1 shows a diagram of a furnace embodiment; figure 2 - the same cross section. The proposed furnace consists of a loading device, including a hopper 1 and a loading chamber 2 with a screw (not shown), a rotating tube 3, a discharge device including a discharge chamber 4, in the lower part of which is installed; auger 5, j6 a chamber 7, a branch pipe 8 for removing hydrogen refractory blocks. 9, heaters 10 of the furnace, formed by slabs 11, supported on a metal frame 12 of the plate 13, heat insulations 14, housing 15, frames 16 on which enclosure, mounting plates 17, side windows (no enclosures, enclosures 18, thermocouples 19, base sheets 20 and slide 21, Vrachakitsa pipe) of which consists of four sectors, measured on the inner surface facing the pipe, the channels for the heater coils. The coils of the heater 10 are connected in series in each heating zone. The ends of heaters with current lead-in1 connected to them (not shown) are led to side mounting boards 17. A channel for thermocouple 19 is provided in the refractory blocks 9. The refractory blocks 9 with the heaters 10 are mounted on the metal slide 21 and the metal sheets 20. In case of failure of the heaters C1, the side mounting boards 37 and covers 18 from the side windows of the housing are wound, after which the refractory blocks 9 with heating 10 (without disassembling the slab 1I and the rotating tube assemblies Easy from the case slippery 21 behind Well metal sheets 20. The process of obtaining metal powder in the proposed furnace, for example tungsten powder, is carried out as follows: The furnace is settled in an angular fashion at a given angle to the horizon (see Fig. Original powder, for example, tungsten anhydride, from a bunker. 1 serves to the working space of the rotating tube 3, where under the action of high temperature and hydrogen the reduction reaction takes place. The recovered material moves along the rotating tube 3 by gravity to its unloading end and is reloaded. chamber 4. The resulting product is unloaded by the screw 5. Hydrogen fed to the furnace through pipe 6 enters the working space of the pipe, moves towards the material being processed, and through the annular gap of the loading trunnion (not shown) into the dust precipitation chamber 7, and the secondary dust is removed from the furnace through pipe 8 (the direction of hydrogen in figure 1 is indicated by arrows /. The dimensional arrangement of the heaters in the sectors of the refractory blocks around the circumference of the rotating pipe with a minimum gap between the heaters and the pipe makes it possible to improve the working conditions of the heaters, reduce their working temperature and increase their service life by a factor of 3-5. electricity consumption is about 1.5 times. The use of a heating chamber formed of sector refractory blocks will reduce the labor intensity of repair work not less than 2 times. The invention is an electric kiln for the production of metal powders, including a heating chamber located in the housing, a rotating pipe installed inside the chamber, a loading and unloading device, which in order to increase service life and reduce labor intensity pe -f assembly works, heating ka 4era made of collapsible refractory blocks, equipped with a metal sled, kaedy of blocks made. They are in the form of four sectors, with the surface of the blocks facing the pipe, B1 oliene cylindrical, and the casing is provided with side windows arranged coaxially with the refractory blocks. Sources of information taken into account during the examination 1. Go to AD and Krushinsky L.N. Design and equipment of workshops, powder metallurgy. M., Mechanical Engineering, 1 965, p. 197-199. 2. USSR author's certificate 111 188, cl. C 21 B, 3/08, 1938.