[China Aluminum] People who know how to make aluminum extrusions know that it is not worthwhile to scrap the material when it is bent. It should not happen. It can be avoided! Then, how to reduce or avoid bending? Scrap it!
Extrusion and straightening: straightening is a very serious link caused by the profile, the straightening work must pay attention to the intensity of straightening. If the strength is too great, the profile may be deformed, closed, orange peel, etc., and the strength is too small. The resulting profile is not straightened, causing bending.
Squeeze frame: This section is also very important, after sawing out the fixed length, aluminum will be framed, this fashion frame worker should pay attention to: This material is an oversized or small material, is with pipe or plane The material pulled out from the die is generally not easy to cause bending when the material is loaded on both ends of the material and the tube, but the material pulled out of the small material and the planar die is likely to cause bending when the two ends are lifted. You should lift the frame from the two ends toward the center. However, even if some profiles do not work, such as louvers, windows, lids, etc., they must be placed on time-efficient profiles and lifted into frames.
Surface treatment: The billet is aged, the hardness is up to standard, and the profile is not so easily bent. However, when it is put on the shelf, it is necessary to pay attention to it. When both ends of the material are raised, try to avoid strong fluctuations from top to bottom. Strong fluctuations will also cause aging aluminum profiles. A certain amount of bending.
Aluminium Profiles At present, bauxite production alumina mainly adopts chemical beneficiation technology, including alkali method, acid method and electrothermal method. Acid and electrothermal methods are still used in industrial applications, while the alkali process is the main method for producing alumina. Alkali method can be divided into Bayer method, sintering method and joint method.
The Bayer process alumina production process consists of raw slurry preparation, high pressure leaching, pressure boiler digestion, red mud separation and washing, species decomposition, alumina grading and washing, aluminum hydroxide roasting, mother liquor evaporation and soda ashing. . The Bayer process is only suitable for the treatment of low-silicon high-quality bauxite, and it is uneconomical to treat the high-silica bauxite because the SiO2 in the ore is converted into aqueous aluminosilicates upon dissolution and thus needs to consume a large amount of NaOH. The effective method for treating high silica bauxite is alkali-lime sintering.
Alkaline-lime sintering process for the production of alumina includes raw slurry preparation, clinker sintering, clinker leaching, red mud separation and washing, crude liquid desiliconization, selenium carbonate decomposition, aluminum hydroxide separation and washing, aluminum profiles Aluminum hydroxide roasting and mother liquor evaporation and other processes.
Alkali-lime sintering method is suitable for the treatment of high-silica bauxite, especially the type of ore-aluminous type in China, and the ore-silicon ratio is less than 4 ore. Sintering is more advantageous. Compared with some Bayer plants that do not have high-grade bauxite, the sintering method has low alkali consumption and high total alumina recovery. The disadvantages are complex production processes, high equipment investment, high consumption, and high product quality. difference.
The joint method is a method developed based on the advantages and disadvantages of the Bayer process and the sintering process. Joint methods are parallel, series and mixed three.
When the treated bauxite is a medium grade, the ore is first leached by the Bayer process. After leaching the red mud, the alumina and sodium oxide are further extracted by the sintering method. The economic effect. It is possible to greatly reduce the scale of the equipment for the sintering, leaching and desilication processes that require large investment in the sintering process. Alkali and alumina in Bayer's red mud can be fully recovered. If a part of low-grade bauxite is added to the raw material prepared from Bayer's red mud, the slag aluminum silicon is increased to facilitate the operation of the sintering kiln, not only improving the technical operation of the large kiln, but also providing part of the sintering process. Alkali and aluminum profiles that are needed in the Alpha part can also achieve good economic results. This is a joint method that combines the characteristics of series and parallel, which is called hybrid joint method.
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