ã€China Aluminum Industry Network】 1. Current status of waste miscellaneous aluminum-zinc slag resources At present, the waste miscellaneous aluminum-zinc slag used in domestic reclaimed aluminum-zinc slag plants mainly comes from two aspects: first, waste miscellaneous aluminum-zinc slag imported from abroad; The domestic waste aluminum and zinc slag, although it is all waste aluminum zinc slag, but the quality is obviously different.
1. Imported waste aluminum-zinc slag has imported a large amount of waste aluminum-zinc slag in recent years. As for the composition of imported waste aluminum zinc slag, most of them are mixed except for a few classifications. Generally can be divided into the following categories:
(1) A single type of waste aluminum zinc slag. Such waste aluminum zinc slag is generally a certain type of waste parts, such as pistons of internal combustion engines, automobile speed reducers, automobile wheels, front and rear bumpers, aluminum zinc slag doors and windows. These waste aluminum zinc slags have been categorized clearly at the time of import. They are of a single species and are all imported in bulk. Therefore, they are high-quality recycled aluminum zinc slag raw materials.
(2) Waste and miscellaneous aluminum and zinc slag slices Miscellaneous aluminum and zinc slag slicing is also referred to as slicing. The reason why it is called slicing is that many developed countries use mechanical crushing to dispose of scrapped automobiles, waste equipment, and various types of waste household appliances. The method will be broken into scraps, and then mechanized sorting, sorting the waste aluminum zinc slag is scrap aluminum zinc slag chips. In addition, the recovery department also uses broken methods to crush into scraps when handling some of the larger scrap aluminum-zinc slag components. Such scrap is also called scrap aluminum zinc slag chips. The waste aluminum zinc slag slicing is easy to transport, easy to sort, and the texture is relatively pure. It is a high quality waste aluminum zinc slag material. At present, in the international trade of waste aluminum-zinc slag trades, the slicing volume is large, and all types of slicing are moving toward standardization. In terms of the components of the slicing, it is generally divided into several grades, among which the high-grade slicing is a relatively pure mixture of various waste aluminum-zinc slags and their alloys, and most of them are smelted in the furnace without any treatment. Low-grade chips contain different amounts of impurities, and generally contain more than 80-90% of waste aluminum-zinc slag. The impurities are mainly nonferrous metals such as scrap steel and scrap copper, and a small amount of waste rubber. After manual selection, Pure scrap aluminum zinc slag. The scrap aluminum slag smelting is relatively easy to smelt, easy to smelt into the furnace, easy to remove impurities, less solvent consumption, high metal recovery, processing costs are low, very popular with users, generally large-scale regeneration of aluminum and zinc slag plants are sliced ​​as main ingreadient.
(3) Mixed waste aluminum zinc slag The composition of such waste aluminum and zinc slag is complex and its physical shape is different. Besides the waste aluminum and zinc slag, it also contains a certain amount of waste steel, waste rubber, scrap copper, and waste. Non-ferrous metals such as lead, scrap zinc, and waste wood, waste plastics, stones, etc., some scrap aluminum zinc slag and scrap steel machinery are combined together. Such wastes are complex and difficult to sort, but a small amount of scrap aluminum zinc slag Large, clear surface, easy to sort. Such wastes must be pre-treated before smelting, ie manually picking out scrap and other impurities.
(4) Incineration of aluminum-zinc-containing slag crushing aluminum-zinc-containing slag wastes This is an aluminum-zinc-containing slag waste with a relatively low grade, which is mainly crushed by various kinds of scrapped household appliances, etc. Incineration of the formed material. The purpose of incineration is to remove combustible materials such as waste rubber and waste plastics. This type of aluminum-containing zinc slag waste generally contains about 40-60% aluminum-zinc residue, and the rest are mainly garbage (brickhead stone fast), scrap steel and a small amount of copper (copper wire) and other non-ferrous metals, and the blockiness is generally below 10cm. . In the process of incineration of such waste aluminum-zinc slag, some aluminum-zinc slag and materials with low melting points, such as zinc, lead, and tin, are melted, forming glassy materials on the surface with other materials and difficult to distinguish with the naked eye.
(5) Mixed shredded aluminum-zinc slag This type of waste is a lower-grade waste aluminum-zinc slag, much like garbage, and its composition is extremely complex. It contains various waste aluminum-zinc slag and aluminum-zinc slag alloy 40-50. %, there are a certain amount of scrap steel and a small amount of lead and copper (less than 1%), and the rest are mostly garbage, stones and earth, waste plastics, waste paper and so on. About 25% of soil, scrap 10-20%, stone 3-5%.
2, the domestic recycling of waste miscellaneous aluminum zinc slag domestic recycling of waste miscellaneous aluminum zinc slag is mostly pure, containing less impurities (except artificial noisy), can be divided into three categories, namely the recycling department often said that the cooked aluminum zinc slag, Waste aluminum-zinc slag and waste alloy aluminum-zinc slag. Waste aluminum-zinc slag is mainly used for scrap casting of aluminum-zinc slag alloys, mainly for waste machine parts such as exhaust gas vehicle parts, waste dies, waste cast aluminum-zinc slag pot pots, internal combustion engine pistons, etc. Waste cooked aluminum-zinc slag generally refers to pure aluminum-zinc slag, aluminum-zinc slag content should be in more than 99%, such as waste cables, waste household utensils, kettles and so on. Scrap aluminum zinc slag, such as waste aircraft aluminum zinc slag, aluminum zinc slag doors and windows. As for the production of waste aluminum zinc slag, it can be divided into domestic waste aluminum zinc slag and industrial waste aluminum zinc slag.
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