SU1073298A1 - Apparatus for recirculating evacuation of metal - Google Patents

Abstract

1. A DEVICE FOR CIRCULATING VACUUMATION OF METAL containing a vacuum chamber with suction and discharge cables and a transporting gas injection unit or inductor, characterized in that, in order to increase the degree of metal refining, on the inner side of the lower ends of metal pipes there are circular inserts , the masses of the inserts on the suction and drain metal pipes are in the ratio 1:

Description

2. The device according to claim 1, characterized in that the inserts are made of alkaline or alkaline-earth mettschlov and / or their salts or ea mixture of refractory material and natural bischofite.

The invention relates to ferrous metallurgy and can be used in enterprises of the metallurgical and machine-building industry during extra-vacuum vacuum processing of liquid metal. A device for vacuum processing of liquid metal is known, which includes a vacuum chamber with partitions of different heights, drainage cables and inductor llj. The disadvantages of this device are the complexity of the design of the vacuum chamber, due to the presence of partitions, and the additional contamination of the metal with inclusions when the partitions are washed out with melt. Closest to the proposed technical essence and the achieved result is a device for circulating vacuuming a liquid metal / including vacuum KciMepy with suction and drain metal lines, a transporting gas injection unit or inductor 2. The disadvantage of this device is the low degree of metal refining from harmful impurities, such as sulfur and hydrogen. The purpose of the invention is to increase the degree of metal refining. This goal is achieved by the fact that in the device for circulating metal evacuation, containing a vacuum chamber with suction and drain metal lines and a carrier gas injection unit or inductor, on the inner side of the lower ends of metal lines there are ring-shaped inserts made of gas-making materials, and drain metalloopic fibers are in a ratio of 1: (0.05 0.2). The inserts are made of alkali or alkaline-earth metals and / or their salts, or of a mixture of refractory material and natural bischofite. The drawing shows the proposed device, a General view. The device consists of a vacuum chamber 1 with a suction 2 and a drain 3 metal lines embedded in it, an input unit of carrier gas 4, annular inserts 5 placed on the ends of the metal lines. The device operates as follows. When the ends of the metal pipes 2 and 3 are immersed in the melt, the gas-forming inserts 5, heating up, release gas that enters the metal. Gas evolution occurs already at the initial stage of evacuation when the chamber 1 is filled with melt. In this case, the metal under the action of vacuum enters the chamber 1 both through the suction 2 and through the drain 3-metal pipe. Alkali or alkaline earth metals and / or their salts emitted in the lower part of metal lines 2 and 3 eject the melt into the chamber, accelerating its replenishment and, thus, intensifying the process of circulation evacuation. At the same time, the vapors of metals possessing the refining capacity, rising through the channels of metal pipes, interact with sulfur and gases dissolved in the melt. At the same time, the metal is cleaned of oxide and sulphide inclusions. When the circulating chamber is filled with melt to the required level and a stable circulation regime is established, the release of refining vapors increases the rate of metal lifting from the end of the suction hose to the argon injection unit and, thus, accelerates the circulation process. At this time, the vapor recovery process in the drain metal pipe is terminated. The ratio between the mass of the inserts on the suction and drain metal pipes is calculated from the condition of accelerating the filling of the vacuum chamber in the initial period of its operation, when the metal pipes are immersed in the metal. With a decrease in the mass of the insert in the suction nozzle, the circulation time of the metal increases, due to the fact that at the initial moment of evacuation the gas released from the insert is not enough to accelerate the rise of the metal through the DRAIN metal conduit. An increase in the mass of the insert in the drain metal pipe more than 0.2 from the mass of the insert in the suction inlet pipe also leads to an increase in the circulation time due to the fact that with further vacuuming, the bubbles released from the gas insert oppose the movement of the metal in the drain metal pipe.

The implementation of inserts from a mixture of refractory material and natural 6 isofit containing MdS1l, 0.9-1.8% CaCl2, 0.3-0.7% KCl and -mikroprimesi A1, Ti, Mn, Si, Ba, etc. in an amount of about 1% allows to carry out complex metal processing at minimum cost (the cost of bischofite is 10 rubles / m).

The economic effect from the use of this technical solution is to reduce the scrap metal

Example. This device was tested in the processing of 35KhNZMFA brand in a 115-ton casting ladle. The depth of the non-alloys in the melt is approximately 200 mm.

The effect of metal evacuation using this device on the technical and economic indicators of the process and the quality of steel is shown in the table. .

while forging by 5%, and when producing vacuum steel 100,000 tons per year, 1,250 thousand rubles will be produced.

Claims (2)

1. METAL CIRCULATION VACUUMING DEVICE containing a vacuum chamber with suction and drain metal wires and a conveyor gas inlet unit or inductor, characterized in that, in order to increase the degree of metal refining, ring-shaped inserts of gaseous materials are installed on the inner side of the lower ends of the metal wires. moreover, the mass of the inserts on the suction and drain metal wires are in the ratio 1: (0.05-0.2). 2. The device according to claim 1, characterized in that the inserts are made of willow alkali or alkaline earth metals and / or their salts or from a mixture of refractory material and natural bischofite. ¹