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Preparation of scrap aluminum
First of all, the primary classification of waste aluminum, graded stacking, such as pure aluminum, deformed aluminum alloy, cast aluminum alloy, mixture and so on.
For waste aluminum products, they should be disassembled to remove steel and other non-ferrous metal parts connected to the aluminum material, and then made into waste aluminum material through the processes of cleaning, crushing, magnetic separation, and drying.
For steel core aluminum stranded wire, the steel core should be separated first, and then the aluminum wire should be wound into a coil.
Iron impurities are very harmful to the smelting of waste aluminum. When there is too much iron, brittle metal crystals are formed in porous ceramic filter, thereby reducing its mechanical properties and weakening its corrosion resistance.
The iron content should generally be controlled below 1.2%.
There is no very successful method in the aluminum industry to satisfactorily remove excess iron from scrap aluminum, especially iron in the form of stainless steel.
Organic non-metallic impurities
Organic non-metallic impurities such as paints, oils, plastics, and rubber.
porous ceramic filter Norway Manufacturer said that it must be removed before re-smelting. For wire scrap aluminum, mechanical grinding or shear stripping, heating stripping, chemical stripping and other measures can generally be used to remove the foreskin.
At present, domestic companies often use high-temperature ablation to remove insulators, and a large amount of harmful gases will be generated during the ablation process, which will seriously pollute the air. Adtech China provides porous ceramic filter and pls contact sales@alalloycasting.com
If a combination of low-temperature baking and porous ceramic filter is used, the insulator is softened first by thermal energy, the mechanical strength is reduced and then peeled off by mechanical rubbing, which can not only achieve the purpose of purification but also recover the insulator material.
The coatings, oil stains and other contaminants on the surface of waste aluminum utensils can be cleaned with organic solvents such as acetone. If they still cannot be removed, the paint stripping furnace should be used to remove the paint.
The maximum temperature of the paint stripping furnace should not exceed 566 ℃. As long as the waste material stays in the furnace for a sufficient time, the general oil and coating can be removed.
For aluminum foil paper, it is difficult to effectively separate the aluminum foil layer and the paper fiber layer using ordinary waste paper pulping equipment. The effective separation method is to first heat the porous ceramic filter in an aqueous solution, pressurize it, and then quickly discharge it to a low-pressure environment, And mechanical stirring. This separation method can recover both fiber pulp and aluminum foil.