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The ceramic filtration system is resistant to the molten metal being filtered, and resistant to thermal shock, erosion and corrosion, allowing molten metal to flow through it. The ceramic filtration system has a barrier located immediately downstream of the ceramic foam filter. There are many uses for barriers. First, it collects the initial melt used to infuse the porous filter member and forms it into a heated molten metal pool. As additional molten metal flows through the filter member, the molten metal in the pool is reheated. This heated molten metal pool helps to start the process and helps reduce the heat loss of the molten metal during the filtration process. This is largely due to the presence of hot molten metal on both sides of the filter assembly. Another advantage of the filtration system is that the molten metal passing through the system travels at a higher flow rate due to reduced heat loss. As a result, the metal is less likely to freeze in the casting nozzle. It can be said that the molten metal flowing through the filter system can better retain heat. The baffle in the filtration system is also used to produce an ideal upward flow of molten metal. Due to this upward movement, any inclusions remaining in the molten metal passing through the filter member form a thin surface layer. The top of the dam wall is approximately at the same height as the uppermost edge of the porous filter member. Of course, once the height of the dam is determined for the wall, its position downstream of the filter assembly can be determined. In operation, molten metal is poured into the CFF filter system. The initial flow of molten metal is used to fill the ceramic foam filter. This initial flow is prevented by the dam wall from entering the outlet. Instead, it collects in the space between the filter assembly and the dam wall to form a pool of heated molten metal. When more molten metal flows through the filter, the additional molten metal is moved up by the dam wall. The additional molten metal is also used to raise the temperature of the collected molten metal and keep it at a useful reheat temperature. Due to the presence of heated metal on both sides of the filter assembly, the filter assembly can be used in a variety of continuous or discontinuous ...
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The ceramic filter has become a necessary material for Emirates Aluminium. By applying the ceramic foam filter, the inclusions in the molten metal can be effectively removed or reduced, the purity of the molten metal can be improved, the surface of the cast metal castings can be smooth, the strength is improved, and the machining loss is reduced, thereby reducing energy consumption and increase labor productivity. The ceramic foam filter can not only filter out large inclusions, but also have inclusions retained throughout the depth of the filter. Inclusions smaller than the surface opening size will stay on the inner surface of the filter when passing through the three-dimensional channel of the filter. Ceramic Filter for Emirates Aluminium plays an important role in reducing turbulence. This will greatly reduce the re-oxidation of the molten metal and make the molten metal pass through the ceramic foam filter smoothly and without any bubbles. When Emirates Aluminium uses a ceramic foam filter, the pore size of the filter should be determined according to the quality requirements of the molten aluminum and the number of inclusions in the molten metal. Determine the size of the filter according to the casting speed and weight. The Emirates aluminum industry currently accounts for 1.4% of the country’s economy and is valued at US$5.4 billion. Emirates Global Aluminum is the largest industrial company in the UAE excluding oil and gas. The company and its surrounding aluminum industry created nearly 61,000 jobs for the UAE in 2017. The Oxford Economics Research Institute reported that for every 100 people working in the UAE, one person is employed in the aluminum industry, its supply chain, or through the wages of employees in that industry. EGA started production in 1979 under the name of Dubai Aluminum Company (DUBAL). It is currently one of the world’s largest aluminum companies and is at the center of the industrial field ...
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The use of ceramic foam filter plates to filter is currently the most effective way to remove inclusions for Ghana aluminum melt purification. The metal filter mesh and fiber cloth filter used by low-end customers can only remove large inclusions in the aluminum alloy melt. However, the inclusions below the micron level cannot be removed, and the metal filter will also pollute the aluminum alloy. The use of foam ceramic filter plates can filter out fine inclusions and significantly improve the mechanical properties and appearance quality of the Ghana Aluminum product. Ceramic filter for Ghana Aluminum is not only good in purification technology, but also easy to use. The initial pressure difference through which the melt passes are only 100~150 mm, and once it passes, it only needs to maintain a pressure difference of 2-10 mm. The principle of ceramic foam filtration and purification is the same as that of ceramic tube filtration, which is a deep filtration mechanism and has a higher porosity (80%-90%) than ceramic tubes. Therefore, it has a large flow capacity and is suitable for filtration in continuous casting and rolling production. The President of Ghana unveiled the Ghanaian aluminum industry integration project and started the development and utilization strategy of bauxite resources. The strategy is divided into 4 phases. The first phase is to expand the current output of bauxite in Northwestern Province and build a refined aluminum plant. The second and third phases will develop bauxite and build a refined aluminum plant in two other regions. The fourth stage is the establishment of Würth Aluminum Company in Tema, Greater Accra. The US$6 billion required for the entire development plan needs to be privately invested in the Ghana Aluminum Integrated Development Corporation (GIADEC). The Ghanaian government hopes that the development strategy will make full use of Ghana’s bauxite resources, establish a globally competitive aluminum industry, and revitalize the local economy and expand employment ...
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The main advantage of the ceramic filter for Greek Aluminium is to effectively eradicate the slag inclusions through the filter plate, and remove the micron-sized fine inclusions in the aluminum liquid. At the same time, because the ceramic filter plate filters out fine inclusions and reduces the effective number of crystal nuclei in the molten Greek aluminum, the molten aluminum nucleates and grows under relatively large supercooling conditions, the solidification time is shortened, and the structure is refined. The ceramic filter for Greek Aluminium can also reduce the hydrogen content in the molten aluminum. Hydrogen atoms can be adsorbed on some oxidized inclusions, and the oxidized inclusions can become the core of bubble growth, so while filtering the inclusions, it also removes the gas. Through adsorption, the content of harmful elements (sodium, potassium) in the aluminum liquid can be removed. According to different customer requirements or on-site environmental conditions, selecting a molten metal filter plate suitable for ensuring product quality can effectively control slag inclusion. The slag removal outside the furnace is mainly done through ceramic filter plates. The ceramic filter plate has a multi-layer network and multi-dimensional through holes, and the holes are communicated with each other. When filtering, the molten aluminum carries inclusions and flows along the tortuous channels and pores. When it comes into contact with the foamed framework of the filter plate, it is directly intercepted, adsorbed, deposited, and so on. When the melt flows in the hole, the filter plate channel is curved, and the melt flowing through the channel changes the flow direction. Among them, the inclusions collide with the hole wall, and firmly adhere to the hole wall. Greece has some of the largest bauxite mines in Europe. The first step in the production of aluminum, the conversion of bauxite to alumina, requires a lot of energy and generates waste, but it is relatively simple, especially if the bauxite used is soluble in caustic soda. The second stage, the smelting stage, requires a lot of electricity to convert alumina into aluminum. In such a multi-step metallurgical process, manufacturers tend to be vertically integrated by participating in all steps of the production process, because each step adds value. Aluminium of Greece, a subsidiary of the Greek industrial group Mytilineos SA, promised that by 2030, all its electricity needs will shift from renewable energy to green energy. The aluminum producer stated in a document submitted ...
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The smelting of aluminum alloys has the characteristics of high heat consumption, easy oxidation, easy absorption of hydrogen, and easy absorption of impurity metals. (1) Consume a lot of calories. Although aluminum has a low melting point, it has a large latent heat of fusion, a large specific heat, a small blackness, and a strong reflection of heat. Compared with other commonly used metals such as iron and copper, it consumes more heat when melting. And the thermal conductivity of liquid aluminum is less than half of that of solid aluminum, which shows that adding solid aluminum to liquid aluminum by conduction and heat conduction will greatly reduce the melting rate and increase the temperature difference between the upper and lower liquid surfaces. At this time, convection heating with strong stirring should be used to make up for it to achieve the effect of heating up. It can be seen that reducing the energy consumption of aluminum alloy smelting is a problem that needs to be solved in the aluminum alloys smelting process. (2) Easy to oxidize. Aluminum has a great affinity for oxygen, and it can quickly oxidize to form alumina. Although the aluminum oxide film formed on the surface of the melt has a protective effect, once it is destroyed, the oxide film enters the melt and is difficult to remove. Because alumina is not easy to reduce, its density is similar to that of the melt. It is suspended in the melt and enters the ingot with the melt, which has an adverse effect on the quality of processed materials. What's more serious is that aluminum oxide is a good carrier for various gases, and its presence will cause the aluminum melt to absorb a large amount of hydrogen. Therefore, molten metal filtration is another important issue in the aluminum alloy melting process. (3) Easy to absorb hydrogen. Aluminum and aluminum alloys have strong suction capacity. Although the absolute amount of hydrogen absorption of aluminum and aluminum alloys is not large, at the melting point, the solubility of hydrogen in the solid phase and the liquid phase differs greatly, and the ingot has a large tendency to form pores and looseness during crystallization. Therefore, metal degassing is the third important issue in the aluminum alloys smelting process. (4) It is easy to absorb metal impurities. Some alloying elements in aluminum and aluminum alloys have high chemical activity ...
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The ceramic foam filter has an excellent filtering effect for aluminum water. It uses a three-dimensional structure to effectively remove oxidized inclusions and other non-metallic inclusions by blocking, capturing, and adsorbing. After the molten aluminum is filtered, the product quality will get satisfactory results. Aluminum products are widely used in areas that require high strength and elongation requirements. Therefore, cast aluminum is very sensitive to defects caused by impurities. Impurities are mainly composed of non-metallic particles, molten slag, and refractory fragments. The alumina ceramic foam filter can effectively remove these impurities, improve the surface quality and mechanical properties of the castings, and reduce the rejection rate. The alumina ceramic foam filter can fill the cavity more uniformly with molten metal, and the molten metal has a higher tendency of turbulent flow. After the three-dimensional pore structure of the ceramic foam filter, the turbulent flow is finally converted into a very stable laminar flow. Laminar flow can fill the cavity better, thereby reducing the impact corrosion of the metal solution on the casting cavity and significantly reducing the rejection rate. Alumina foam ceramic filter, applicable temperature 1250℃, suitable for filtering and purifying aluminum water. In order to meet the increasing quality requirements of aluminum castings, the use of alumina ceramic foam filters is becoming more and more important. The alumina foam ceramic filter product effectively removes the solid inclusions in the molten metal, so the aluminum alloy can be forged, aluminum foil manufacturing, extrusion processing and other processes smoothly, and perfect aluminum products can be obtained. The product has a selection range of 10ppi coarse pore size to 60ppi very fine pore size, and there will always be a product standard that suits your requirements. Both the ordinary size and the special size required by the customer can meet the requirements ...
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In the production of aluminum alloy products, whether high-quality products can ultimately be produced depends mainly on the smelting and casting links. In the melting and casting process, hydrogen removal and impurity removal are the most important. For production lines that use scrap aluminum as raw materials to produce aluminum and aluminum alloys, online refining technology is the key. At present, the online scrap aluminum refining purification treatment mostly adopts the method of degassing + filtration. Because these two methods are complementary to each other, slag and gas cannot be completely separated. In general, slag is associated with gas, and the more inclusions, the higher the gas content in the melt, and vice versa. In the degassing process, the inclusions in the melt must be removed at the same time. While removing the inclusions, the gas content in the melt must be reduced. The online degassing method mainly uses nitrogen or argon as the refining gas or nitrogen (or argon) + a small amount of chlorine and other reactive gases. This not only can effectively remove the hydrogen in the aluminum melt, but also removes alkali metals or alkaline earth metals well, and at the same time can improve the effect of slag-liquid separation. Filtration is the most effective and reliable method to remove non-metallic inclusions in the aluminum melt. Better effects are ceramic foam filter plates, filter tubes, deep bed filtration, etc. Among the structural metals used in industry, aluminum has the highest recyclability and the greatest regeneration benefit. Due to the high corrosion resistance of aluminum, with the exception of certain aluminum chemical containers and devices, aluminum products are hardly corroded during their use, such as architectural aluminum doors and windows, high-voltage power transmission and distribution lines, aluminum structures and parts for transportation, aluminum Making cans and so on. These aluminum products have only a very small amount of corrosion loss during use, and almost all of them can be recycled. Recycled aluminum is metal aluminum rather than mineral raw materials, so its smelting process can save a lot of energy consumption. The energy consumption of scrap aluminum recycling is only equivalent to 5% of the total energy required from bauxite mining-alumina extraction-electrolytic casting of primary aluminum into ingots. That is, compared with primary aluminum, each ton of recycled aluminum can save 95% of energy. At the same time, it can save 10.05 tons of water, use 11 ...
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In the aluminum coil rolled products industry, the continuous casting and rolling process have been widely used in the production of coils. In the world’s total output of aluminum plates, strips, and foils, hot-rolled billets are less than 20%, and lower-cost twin-roll continuous casting billets are more than 80%. Improving the quality of double-roll continuous cast-rolled aluminum coils can eliminate defects such as white strips, black spots, large grains, sticky rolls, and cracked edges of the cast-rolled sheet. The characteristic of the twin-roll aluminum coil continuous casting-rolling process technology is continuous uninterrupted production. Any accident or frequent start and stop caused by power outages will cause the quality of the cast-rolled plate to fluctuate. Therefore, it is very important to maintain the long-term stable operation of the twin-roll continuous casting-rolling machine. It is necessary to strengthen the degassing and filtration of molten aluminum, add grain refiners, and at the same time strengthen the sense of responsibility of the operators. The method of purifying molten aluminum in the furnace can only remove the newly added impurities during the melting process, but cannot eliminate the secondary pollution of the molten aluminum during the pouring process. At the same time, due to the large area of the furnace and the shallow depth of the molten pool, flux refining is difficult to effectively purify molten aluminum in every corner. Therefore, in the modern melting and casting process, the online degassing and filtering purification treatment method outside the furnace is used, it makes the aluminum liquid contact with the gas flux in the degassing filter box, and then flow into the semi-continuous casting mold or the continuous casting tip and nozzle. This ensures that all molten aluminum is effectively purified and prevents secondary pollution. After online degassing and filtering purification treatment, the hydrogen content of molten aluminum can be reduced by 60%. Non-metallic inclusions with particle diameters below 50 um can be removed by 50%, and those above 100 um can be removed by 90% ...
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Cold-rolled aluminum coil process usually refers to the processing of cast-rolled material. As for the aluminum coil casting and rolling process, relatively speaking, it may be much simpler. Aluminum ingot—aluminum liquid—furnace—cast-rolled coil, which is a conventional processing technology for raw cast-rolled materials. The hot rolled aluminum coil process is that its raw material is directly hot-processed and rolled from a large aluminum ingot. After more than ten times of high-temperature processing, the products are then finished rolling according to different uses. What are the differences between cold-rolled aluminum coil and hot-rolled aluminum coil? Cold-rolled aluminum coils prefer a non-heatable treatment process. For example, 1060 aluminum coil, 3003 aluminum plate, 1100 aluminum plate, etc. Cold-rolled aluminum coils are suitable for simple stamping, but not suitable for a wide range of finished products. Therefore, cold-rolled aluminum coils are mainly concentrated in building exterior walls, signs. The advantage of hot-rolled aluminum coil is that it can be heat-treated, and it has extremely high forging and secondary processing technology. Its advantage is to make up for the disadvantage of the cold-rolled aluminum coil in stamping. For example, the aluminum used in airplanes is a standard 2 series aluminum plate, which is a product formed by hot rolling and high-temperature forging. The difference between hot rolling and cold rolling is that cold rolling is rolling at the work hardening temperature, and hot rolling is rolling above the work hardening temperature. Generally, the requirements for the surface layer are relatively high, and thin raw materials such as single zero foil and double zero foil can only be rolled by cold rolling. Materials with high corrosion resistance and strong ductility must be hot rolled. AdTech serves the aluminum foundry industry and solves the problem of aluminum liquid purification. AdTech focuses on the research and development of fluxes, online degassing filter equipment, ceramic foam filter plates. We also produce hot top casting accessories, casting nozzle plates, flow control series, and other casting parts. So far, AdTech has covered a full range of materials in the aluminum alloy casting industry. It can fully meet the needs of various orders from customers ...
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Industrial Casting and Rolling Production Process: The molten metal in the stationary furnace is degassed and slag removed by the online degassing system. After the filtering system is filtered, the molten aluminum is stably fed into the casting nozzle through the liquid level control system. It is transported from the casting nozzle to the roll gap of the casting mill. After continuous casting and rolling, it is made into a cast-rolled plate, and after shearing, it is wound into a cast-rolled coil by a coiler. In the process of casting and rolling production, the temperature difference between the surface and the center is relatively large, the surface layer is low in temperature and it is not easy to deform, and the temperature in the center is high and it is easy to deform. When entering the deformation zone from the casting zone, the metal is used for rolling, the surface metal adheres to the surface of the casting roll, and the metal in the center of the slab slides backward relative to the surface metal. Due to the uneven deformation and flow, the outer layer of the solidified shell in the liquid cavity is subjected to tensile stress. In the casting area, when the liquid cavity is shallow, the solidified shell is thicker and cracks are less likely to occur. And when the liquid hole is deeper. The solidified shell is thinner. When the tensile stress generated by the uneven deformation is large enough, the solidified shell cracks at the weak point, and then expands to form a crack. When the melt is overheated or the melt has been shut down for too long, the nucleation points in the melt are reduced, and cracks are likely to occur at the grain boundaries. When the casting-rolling speed is faster or the front box temperature is higher, the casting-rolling area is larger, and the feeding nozzle is partially damaged, which deepens the liquid cavity, cracks are likely to occur on the surface of the cast-rolled sheet. Prevention Method Reasonably arrange the gaskets of the feeding nozzle to maintain a good state of the roll surface and make the temperature distribution of the crystallization front even. Appropriately reduce the casting-rolling zone, reduce the casting-rolling speed and the temperature of the front box, so that the solidified shell in the casting-rolling zone is thickened, and it is not easy to tear during rolling deformation ...
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