Aluminum ash, usually classified according to morphology, such as aluminum slag or aluminum ash, especially secondary aluminum ash, refers to the metal aluminum extracted from the aluminum slag, after being ground by a ball mill and sieved, Metal aluminum is sieved out to achieve metal aluminum extraction, and the remaining aluminum ash remains a small amount of metal aluminum. Depending on the refining method, two types of aluminum ash can be produced: one is the aluminum ash of the electrolytic aluminum liquid. Electrolytic aluminum liquid aluminum ash comes from pure aluminum liquid, and its components are mostly aluminum oxide, aluminum nitride and a small amount of fluoride. The second is aluminum alloy cast aluminum ash. Due to the presence of elements such as silicon, magnesium, copper, iron, and zinc in the aluminum alloy liquid, the alloy aluminum ash contains various metal impurity elements and a small amount of fluoride.
For aluminum processing companies, aluminum ash is generally discarded directly or sold at a low price. However, aluminum ash is a dangerous solid waste, and if it is disposed of at will, it will cause great pollution to the surrounding environment. The country has strictly regulated this in the past two years. Therefore, how to effectively use aluminum ash, reduce pollution, and improve utilization rate has always been the focus of many enterprises.
The separation and utilization of aluminum ash elements are realized by multi-disciplinary techniques such as beneficiation, alumina smelting, chemical industry and environmental protection. Firstly, ammonia, fluoride, slag-removing agent, aluminum nitride and other substances in aluminum ash are separated, and then the degree of activity is not The same α-alumina, β-alumina, aluminum hydroxide and other substances, and further separation of aluminum, ash, silicon, magnesium, copper, iron, chromium, zinc and other elements.
It is understood that the total investment of the project is 20 million yuan, the aluminum ash processing capacity can reach 10,000 tons/year, the metal aluminum scrap is about 1000~1500 tons, the aluminum hydroxide is 8500~10000 tons, and the nitrogen in the aluminum ash can be effectively recovered. . This separation method is not only suitable for the treatment and disposal of electrolytic aluminum ash, but also for aluminum processing aluminum ash and secondary aluminum ash which are complicated and difficult to handle.
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