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At present, many factory companies are invariably on the aluminum foil project. China's aluminum foil industry is developing so fast, but where does the billet come from? Notwithstanding China's large number of hot-rolling and double-roll casting methods, the supply of aluminum foil blanks can be solved, but the gaps in wide-quality high-quality aluminum foil blanks Great, can not be ignored. Insiders pointed out that China's wide-range high-grade aluminum foil wool has become a bottleneck in the development of the aluminum foil industry. Then, how to solve this problem? Domestic experts and senior engineers from Shanghai Aluminum Industry Co., Ltd. engaged in non-ferrous metal continuous casting and rolling process study And put forward a better measure, that is, “build a Hazratt production line in an aluminum plant with primary aluminum production capacity of 200,000 tons/year or more.â€
The Hazlate technology production line was developed and developed successfully by Hazelett, USA. In order to be able to produce high-quality aluminum foil blanks, Hazlet has developed at least the following new technologies:
Instant induction preheating technology for casting strips. The water vapor on the surface of the strip is removed, and the adverse effect of non-uniform thermal expansion on the slab shape when the strip is heated is eliminated;
A permanent magnet is incorporated in the support roller on the back of the strip. Prevents possible chattering of the strip (before the molten metal has not yet solidified), ensuring that the slab's profile is not affected;
Mixed inert gas was injected into the mold. The casting is carried out under anaerobic conditions, while the slab shape can be adjusted through zonal control;
Single-channel flake nozzles are used. Prevent the turbulence of aluminum water during casting, and ensure that there is no flow mark on the surface of cast strand;
On top of the longer-lasting coating, an expendable nano-silica coating was applied by electrostatic deposition. Demoulding is convenient and the surface quality of the slab is improved.
Due to the development and adoption of the above-mentioned new technologies, the Hazlett process has matured and is a very technology. In China, it will be the third kind of blanking method besides casting and blanking and direct cooling and hot rolling. It will attract wide attention. This process has its enormous advantages that cannot be ignored: excellent product quality, hot-rolled structure, energy saving and consumption reduction, flexible production arrangement, and good economic returns. This process is particularly suitable for China's national conditions, because China's market demand is large. In addition, there are many large-scale smelters in China. Reagan, vice president of Hazeletter, said: “For high-yield aluminum foil blanks, when the annual output exceeds 40,000 tons, there is no other process that can match the Hazratt process. Of particular significance is that China can We hope to use aluminum liquid directly from the smelter to produce 1mm thick hot rolled coils, which will be transported to aluminum foil plants after cold rolling, which will greatly reduce material consumption and energy consumption.†Some experts in China also propose that some can be added downstream. High-precision cold rolling mill, tension straightening machine and scissors cutting machine to ensure the production of high quality aluminum foil blanks.
The production base of Hazlate's process is Spain's CVA company. Its production practice is outlined below:
(1). The raw material is a primary aluminum ingot, the net width of the strand is 1320 mm, and the continuous caster is followed by a three-stand four-high hot-rolling mill (reconstructed from the old steel rolling mill by VAI). Two furnaces were built, each with a capacity of 70 tons, both as melting furnace and holding furnace;
(2). Liquid aluminum treatment. Alpur (provided by NorskHydro) technology is used to remove hydrogen. The content after degassing was less than 0.1 mL/100 mg. Filtering: The accuracy is not lower than 50 PPI. Grain refinement: The aluminum titanium boron wire is introduced into the aluminum liquid at a rate of not more than 2 kg/t. The as-cast grain sizes are 90 microns (surface layer) and 250 microns (center layer);
(3). Use of a strip shape suitable for casting aluminum foil blanks. On-line consumable electrostatic deposition using nanoscale silicon dioxide;
(4). Using a non-spaced sheet casting nozzle. Casting nozzles are made of alumina and silicon oxide high-temperature fibers. The binder is boron nitride. Has sufficient porosity to ensure non-stick aluminum;
(5). Water film cooling, horizontal partition adjustable, help control the board type;
(6). Magnetic support rolls are used in the front section of the mold section, and flexible molds are formed by water pressure in the rear section. The shape of the cast sheet is strictly controlled so that the thickness in both the longitudinal and transverse directions is less than 2 mm. A high-temperature imager is provided at the exit of the slab to monitor the thickness difference and adjust the casting conditions as needed. The thickness difference is very rare, it is the key to producing high-quality aluminum foil, and it is also the key to improving the finished product rate of aluminum foil.
(7) In the production of triple rolling, the emulsion flow is used to control the slab laterally in order to control the plate type;
(8). 3 mill roll radian: all negative 0.175 mm; or negative 0.2 mm (front rack), negative 0.175 mm (second, third rack). The hot strip has a positive curvature: the middle is thicker and the two sides are thinner. The difference between the two is preferably 0.6%. Hot-rolling mill with thick and hydraulic bending system;
(9). The strip thickness after hot rolling is 1.4 mm. No cold cutting is required. It should also be pointed out here that compared with the direct cooling and casting processes, the Hazlate process saves a considerable amount of cold rolling downstream;
(10). The aluminum foil blanks produced by CVA, Spain, are partially self-contained and some are sold on the European market. After the user rolled it to 0.00635 millimeters, he examined the number of pinholes, which was less than 100 per square meter.
Aluminum foil has been recognized as a packaging material by the world because of its various advantages. According to relevant statistics, in the economically developed North America, a total of 6.04 million tons of aluminum rolled material was produced in 2004, of which 41% was used for packaging materials, and most of them were thick foils and thin foils. Since China's reform and opening up, the economy has developed rapidly and the amount of aluminum foil has increased significantly.