Aluminum has a relatively small specific gravity, and belongs to the ranks of light metals along with titanium and magnesium. The content of aluminum in the earth’s crust ranks third, second only to oxygen and silicon. The reserves are very abundant. In the metal industry, aluminum is second only to steel. And aluminum alloy is gradually replacing traditional steel-made cars, achieving the purpose of lightweight cars, realizing high-speed, safe, energy-saving, comfortable, and environmentally friendly cars. In addition, aluminum has good ductility, electrical conductivity, thermal conductivity, heat resistance and new radiation resistance. These excellent properties have laid a good foundation for the global growth of aluminum alloy die casting.
Aluminum rarely exists as a pure metal in nature. Most of them are stored in the deposit in the state of oxides, hydroxides and conserved aluminosilicates. At present, there are 258 kinds of aluminum minerals, of which there are many kinds, and about 43 kinds are rare. Aluminum minerals are generally distributed in deposits as associated minerals or symbiotic minerals, and contain impurities. Bauxite is the main industrial raw material for the extraction of aluminum. At present, the bauxite used as industrial raw materials is mostly two types of bauxite, one is laterite type bauxite, but sedimentary type bauxite. Laterite bauxite is an aluminum-bearing parent rock in a hot and humid climate, in favorable terrain, generally remnant hills, low mountains and terraces. Under the weathering and decomposition of water, carbon dioxide and organisms, the easily soluble substances KNaCaMg and silica in the parent rock are leached and discharged, and the less mobile substance AlFeTi remains in situ to form laterite-type bauxite. Sedimentary bauxite is a kind of aluminum-bearing rock. Under the action of gravity, water and natural acid, after a long period of physical and chemical transformation in nature, aluminum-bearing minerals are brought to depressions, valleys, or basins. Bauxite formed in. In aluminum refining, the ratio of bauxite to AlO is generally 1:2. The ratio of AlO to pure aluminum is 1:2.
The density of aluminum is very low, the specific gravity of 2.7, about 1/3 of the general metal, its conductivity is about 61% of copper, can be used as a suitable replacement for the existence of copper wires. Pure aluminum is very soft and malleable, and its hardness is generally improved by cold working or processing into an alloy.
With the view of sustainable development and the protection of the earth’s environment deeply rooted in the hearts of the people, the development of the metal industry in the future will make it a trend to save materials, save energy and adopt new energy. Aluminum alloy has low density, high strength, good plasticity, excellent electrical and thermal conductivity, and has good mechanical and physical properties. It is an alloy with high performance at room temperature and a widely used raw material in the die-casting industry, and the application range of aluminum alloy die-casting products is becoming wider and wider. In addition, aluminum alloy die castings are in line with Premier Li Keqiang’s “Made in China 2025” policy to transform from extensive manufacturing with high resource consumption and high pollutant emissions to green manufacturing. After the aluminum alloy die-casting product has reached the end of its service life, the materials can be recycled, and the recycling process and process are simple.