Aluminum liquid online refining device

Abstract

The invention discloses an aluminum liquid online refining device. The aluminum liquid online refining device comprises a stirrer, a refined brick, a degassing box body and an aluminum liquid heat preservation heating device, and is characterized in that a degassing chamber and a heating and preserving chamber are arranged in the middle of the degassing box body, inner containers of the degassingchamber and the heat preservation chamber are made of a plurality of non-sticky aluminum hard materials into modular bricks, a blocking wall and an aluminum liquid through hole are formed between thedegassing chamber and the heating and preserving chamber, a turbulent flow brick is arranged in the degassing chamber, and a refining brick and an air supply pipe are arranged at the bottom of the degassing chamber; a water inlet, a water outlet, a slag removing opening and a water discharging opening are formed in the box body, a degassing chamber cover and a slag removing cover are arranged at the top of the box body, and the water outlet is provided with a diving brick; a mechanical stirrer is arranged on the degassing chamber cover, and is positioned above the refining brick; the molten aluminum heat preservation heating device consists of a silicon carbon rod and a protective sleeve; and the silicon carbon rod is arranged on the heated heat preservation cover of the box body. The device is simple in structure, low in production cost, good in product refining effect and long in service life.

Description

technical field [0001] The invention relates to an on-line refining device for molten aluminum used before continuous and semi-continuous casting of aluminum billets. Background technique [0002] At present, when casting aluminum billets with high quality requirements at home and abroad, it is necessary to install an online refining device on the flow channel before the casting machine to perform online degassing and slag removal on the molten aluminum, sometimes with crystal grains Functions such as addition of refiner, stirring, filtering, heating and heat preservation. At present, there are two kinds of aluminum liquid on-line refining devices commonly used at home and abroad: one is graphite rotor-type on-line refining device, such as Chinese patent 201310518883.0, which utilizes the rotation of one or more graphite rotors in aluminum liquid to break The input of high-purity nitrogen (argon) increases the number of bubbles, expands the area of ​​bubbles, and prolongs t...

AI Technical Summary

Problems solved by technology

But there are the following disadvantages: a. Higher operating costs: the consumption of graphite rotors and plug-in silicon carbide rods is relatively large, and the consumption increases when the number of graphite rotors increases, and power consumption also increases

But there are the following deficiencies: a. The refining effect is poor: due to the electromagnetic stirring combined with the circular cavity, it is easy to form a continuous swirl between the dispersed bubbles and the aluminum liquid, the bubble particles are large, the dispersed and rising bubbles merge and the bubble residence time is short Generally, the hydrogen removal rate is only 30-40%.

But there are the following deficiencies: a. The refining effect is poor: due to the electromagnetic stirring combined with the circular cavity, it is easy to form a continuous swirl between the dispersed bubbles and the aluminum liquid, the bubble particles are large, the dispersed and rising bubbles merge and the bubble residence time is short Generally, the hydrogen removal rate is only 30-40%.

b. Poor stirring effect: grain refiner, aluminum liquid chemical composition and temperature uniformity are poor

c. Poor heating effect: film and slag will form on the surface of the aluminum water produced, and the aluminum water has a certain depth in the room, and the heat of the radiation body cannot be transferred in time, and it is almost impossible to make up for the heat lost due to the removal of impurities by the inert gas , making it more difficult to control the subsequent process

d. The sudden cooling and sudden heating of each part of the box is too obvious: because there is no slag removal port, the cover must be opened to remove the slag after a period of production, so that the material in the box is rapidly cooled and heated to affect the service life

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