In 2008, the world’s primary aluminum production was 42540 kt, the production of recycled aluminum was approximately 17,000 kt, and the total aluminum consumption was nearly 60000 kt. They were consumed in the form of aluminum and castings in various industries of the national economy, including aluminum (plates, belts, foils, pipes). , Rods, Types, Lines, Forgings, Pastes, etc.) of approximately 40,500 kt, casting products (die castings, castings, etc.) of approximately 19,500 kt. Before the production of aluminum and foundry products, it is necessary to cast the raw aluminum obtained by electrolysis into Yuanbao ingots. After Yuanbao ingots are remelted, cast slabs and round ingots and wire blanks for processing are cast. After the scrap aluminum is smelted, some of them are cast and recycled. Aluminum alloy ingots, after remelting casting a variety of die castings and castings, but because there is a part of the original aluminum directly cast into the processing of ingots, a part of the regenerated aluminum alloy melt directly cast into castings and processing ingots, so in During the production of aluminum and foundry products, the degassed aluminum melt is required to be approximately 85,000 kt, rather than twice the total aluminum consumption, ie 120,000 kt (120 mt). In the production of aluminum melt will always be mixed with a certain amount of solid inclusions and absorption of a certain amount of gas, the former mainly to oxides (such as alumina), the latter mainly to hydrogen.
According to different alloy smelting processes, the content of solid inclusions is generally 0.8% to 2%, and the hydrogen content is usually 1.8ml/100g aluminum to 4.5ml/100g aluminum. In order to produce high quality aluminum and cast products, it must be The solid inclusions and gas content in the aluminum melt are purified to the lowest possible level. The purification treatment is performed inside and outside the furnace, and the furnace treatment is to add a certain amount of flux and inert gas to the aluminum melt, so that the inclusions and hydrogen float to the surface of the aluminum melt, and then they are pulled out. Slag. In order to accelerate the separation process of the inclusions, the melt must be stirred. Stirring the melt also has the effects of uniform temperature, uniform alloy yarn, and uniform flux. When smelting aluminum alloys in conventional modern reverberatory furnaces, the temperature is always non-uniform, the surface temperature is high, the temperature in the lower layer is low, and sometimes the difference is between thirty and forty degrees Celsius. After stirring, the melt temperature difference is preferably not more than 5°C. In conventional furnaces, inclusions, degassing, or addition of fluxes are used to pass in inert gas. Most of the stirring is carried out independently. It not only has high labor intensity, but also has a long operating time at high temperatures, and does not exert the coordinated effect of increasing purification efficiency. Fuzhou Mate New High Temperature Material Co., Ltd. Ke Dongjie senior engineer invented the rotating rotary powder mixing degasifier will add flux, pass inert gas and stirring set in one, by a machine mechanical action one-time completion, labor conditions In order to change, time has been significantly shortened, quality has improved, and efficiency has improved. The deaerator has been granted a Chinese patent on March 11, 2009, patent number ZL200820102067.6.
This multi-functional rotating-dust stirring and degassing machine in the furnace is composed of a rack device, a tilting and rotating device, a powder spraying device, and a guide device. The relevant transmission method involved in the tilting and rotating device may be a manual screw jack type, and may also be a hydraulic and pneumatic method. This new type of rotating rotary powder mixing degasifier has the following features: simple structure, easy to use, dual function of powder spraying and stirring, working in the furnace is not limited by the degree of freedom, mechanical stirring of aluminum melt, alloy chemical composition and melting The body temperature is quickly and evenly achieved, and at the same time, the degassing and slag removal effect in the furnace is achieved, and the melt purification speed is high and the effect is ideal. There are now more than 10 such rotating powder mixing degasifiers operating in the aluminum processing plant casting shop, in good condition.