SU1697880A1 - Method and apparatus for dispersing of materials - Google Patents

Abstract

This invention relates to a technique for dispersing powdered materials. The purpose of the invention is to increase the dispersion efficiency. The material in powder form is fed into the chamber formed by the cylindrical body of the plasma-chemical reactor. The cylindrical case 2 of the reactor is a low-voltage electrode 1 which, with a rotating high-voltage electrode inside, acts on the material with an electric discharge. gas is injected into the chamber. Subsequent material supply into the chamber is carried out in a fluidized state, for which the chamber is in communication with a dispenser 5 which consists of a hopper 6 and a connected cylinder 7 made of electrically insulating material with it. Electrodes 8 are installed inside cylinder 7. After the gas is injected into the chamber, voltage is applied to the metering electrodes 8 and the electrodes of the reactor. f-ly, 2 ill. 1 tabl vs 00 v

Description

BUT

four

Fm.1

This invention relates to a technique for dispersing powdered materials (metals, semiconductors, dielectrics) and can be used in powder metallurgy, chemical, radio engineering, medical and other industries.

The purpose of the invention is to increase the dispersion efficiency.

FIG. 1. Shows a device for dispersing a material with which the proposed method is carried out; longitudinal section: in Fig. 2 - section A-A in Fig.

The device consists of a plasma-chemical reactor, including a rotating high-voltage electrode 1, a cylindrical body 2 arranged coaxially with respect to the latter, acting as a low-voltage electrode, a channel 3 for outputting material, a channel 4 for gas. The device contains a dispenser 5, which consists of a hopper 6 and a cylinder 7 connected to it from an electrically insulating material, the electrodes 8 are installed inside the latter.

The source material is poured into the hopper 6, a powder hill is formed between the electrodes 8. The bunker is sealed. Through channel 4, the gas is pumped out of the reactor reactor system. Then gas is injected through the same channel 4. A constant voltage is applied to the electrodes 8 of the metering device and the electrodes of the reactor,

In the metering unit, a fluidized mass is formed, which evenly falls into the pipe 9, from where the effective dosage of the processed material goes into the working volume of the reactor, where the fluidized mass moves with the help of electrode 1 to the channel 3.

The results of processing of the three powder materials are listed in the table under the following conditions: r, kV,, u) 1400 rpm,. , 001 mm Hg, mm Hg, where m is the mass of the processed material; Ui is the voltage across the metering electrodes; 1) 2 - voltage at the electrodes of the reactor; co-rotation frequency of the internal electrode of the reactor :, (p is the angle of inclination of the reactor; Pi is the pressure of the pumped volume of the reactor-dispenser system; 2 is the pressure of gas inlet into the working volume.

Example, For powder material processing on. The proposed installation takes 3 g of the material, falls asleep into the bunker b, pressurizes it, pump out the reactor-dispenser system to the degree of the end of 10 Pa. start 10 Pa, inject argon to pressure Pa, apply a constant voltage to the electrodes of the 6 kV metering device and the electrodes of the reactor § k8. Then turn on the engine

to rotate the inner electrode 1. Thereafter, the end of the material processing cycle is marked at risk in the glass collection.

From the data of the table it follows that when processing various metallic and non-metallic powder materials the dispersion increases, the variation in the average particle size of the powder material decreases. You can effectively

control installation modes in order to obtain the desired dispersion of materials, in addition, the same chain can be achieved by repeating processing cycles.

The powder material is dosed into the working volume literally over the particle, therefore, in this case, it is a partial dosage, using a spiral plasma to create a swirling fluidized cloud, which is directed towards the collector through the channel 3. As a result, the material is processed and a more complete collection of the processed material is provided. It is also possible to control the dispersion of the obtained powder material.

Claims (2)

1. Method of dispersing materials by feeding material in powder form into the chamber with subsequent exposure to electric discharge, characterized in that, in order to increase dispersion efficiency, a shallow vacuum is created in the chamber, then gas is injected into the chamber, and then powder is introduced into the chamber in a fluidized state. 2. A device for dispersing a material containing a plasma chemical a reactor made in the form of a cylindrical body with material input and output channels and a high-voltage electrode installed inside it, characterized in that, in order to increase the dispersion efficiency, it is equipped with a metering unit in the form of a bunker and an electrically insulating material cylinder connected to it parallel to its axis by two electrodes, the cylinder case of the reactor is installed at the top, has a gas channel in the upper part and is made of stainless steel, and its ends are sealed with flanges made of electrically insulating material, the high-voltage electrode is made with a spiral conductive winding, and the metering device is connected to the reactor housing by means of a nozzle located adjacent to the gas passage. The results of processing of three different materials Fe, Tl, Si Oz  Aa 2