SU867813A1 - Pneumatic pump for feeding pulverulent agents into molten metal - Google Patents

Description

(54) PNEUMATIC PUMP FOR SUPPLY OF POWDERED REAGENTS TO LIQUID METAL

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This invention relates to pneumatic conveying and can be used in metallurgy to treat liquid metal with powdered reagents.

A pneumatic pump is known for supplying powdered reagents to a liquid metal containing a chamber with loading and unloading pipes and an aeration device 1 mounted in the lower part of the chamber.

The disadvantage of pneumatic pumps of this design is that a fluidized gas-powder suspension is supplied to the metal to a greater or lesser extent with moisture. The sources of this moisture can be either the powdered materials themselves, which are saturated with moisture (due to their hygroscopicity) on the way from the place of their preparation to loading into the pneumopump, or aerating and transporting powder gases (argon, nitrogen, air, etc.) . This disrupts the normal operation of the pneumatic pumps, since it makes it difficult to aerate the powder and contributes to the "bedding of powdered materials in the pneumatic tubing and its clogging. In addition, the introduction of wetted materials into the metal leads to its saturation with hydrogen, which adversely affects the quality of, for example, steel, which is especially prone to flocculation.

The purpose of the invention is to increase the reliability of the pneumatic pump and to improve the quality of the metal being processed.

The goal is achieved by the fact that the pneumatic pump is equipped with a moisture-absorbing filter installed in the chamber, the ratio of the surface area of which to the internal volume is not less than 1.

The drawing shows a pneumatic pump for feeding powdered reactants to a liquid metal, a general view.

Claims (1)

A pneumatic pump consists of a chamber 1 with a charging nozzle 2 for powdered reagents. In the lower part of the chamber 1 15 mounted aeration device, made in the form of a porous partition 3, enclosed in the casing 4. The kezhuh 4 is connected to the pipeline 5, which in it by. a gas is given for aeration of the powder in chamber 1. Above the partition 3 there is an intake funnel 6, connected to the discharge pipe 7, on which the stop valve 8 and the mixer 9 are located, connected to the pipe 10, which conducts the accelerator gas for transporting the suspension to the lance immersed in the metal. In the upper part of the chamber, in its cavity, there is a moisture-absorbing filter 11 fixed on the rod 12, which ends outside the chamber with the eye 13. The rod 12 is provided with a cover 14 hermetically welded to it, hermetically closing it, the opening 15 of the socket 16 serving for insertion into the cavity pneumocameras of the filter 11. The lid 17 of the chamber 1 is mounted with a sushi, ayush: a pressure gauge 18 and an overflow valve 19 with its cavity. Valves 20 and 21 are installed on pipelines 5 and 10. The amount of moisture absorbed filters installed in the cavity of the chamber is not This is determined by the conditions of aeration (gas dynamics) inside the cavity, the humidity of the material and the design of the filters. However, the greatest success is achieved when the ratio of the surface area of the filter to the internal volume of the chamber is numerically equal to or greater than 1. The filter can be made by any known method using any known water-absorbing reagent or device. As the simplest solution, the moisture-absorbing filter can be made in the form of a hollow cylinder filled with silica gel. The side surface of the hollow cylinder is made in the form of a metal (copper) mesh, but another porous material can be used. The inner cylindrical wall of the moisture-absorbing filter can be made either porous or gas-tight, which in the proposed design of a pneumonac is not of fundamental importance. The filter 11 is fastened to the rod 12 by one of the known compounds, for example, wedge, bolt, etc. Pneumopump works as follows. After the powdered reagent of the required fraction and chemical composition is loaded into the cavity of chamber 1, the loading nozzle 2 is sealed, and a desiccant filter 11 is inserted into the cavity of chamber 1 through opening 15 of nozzle 16, which is sealed to cover nozzle 16 by means of cover 14 of stem 12 blocking the opening 15. After that, open the valve 20 and supply gas to the aeration of the powder. During aeration, moisture is absorbed from the slurry, and after opening the valves 21 and 8, the dried precipitate is supplied to the metal. After working off (moisture saturation), the moisture-absorbing filter is replaced with a new one, and the used one is regenerated. The use of the proposed pneumopump allows to reduce the cost of anti-floc treatment of steel and (by increasing the yield of good steel) to reduce the transfer of metal to a lower grade. The expected economic effect is 497,000 thousand rubles. in year. Pneumopump for supplying powdered reagents to liquid metal containing a chamber with loading and unloading nozzles and an aeration device mounted in the lower part of the chamber, characterized in that, in order to increase reliability and improve the quality of the metal being processed, the pneumopump is equipped with a moisture-absorbing filter installed in the chamber , the ratio of the surface area of which to the internal volume of the chamber is not less than 1. Sources of information taken into account during the examination 1. Smoldyrev A. E. Hydro and pneumatic transport. M., “Metallurgists, 1975, fig. 99 (prototype). t3 . .: - r; -; v. 25 . . .-, h V.: -four t 2 / / 0 W - 7 / ((