Aluminum processing | History, Mining, Refining, & Facts | Britannica
Aluminum processing, preparation of the ore for use in various products. In addition to its low density, many of the applications of aluminum and its alloys are based on its high electrical and thermal conductivity, high reflectivity, and resistance …
Aluminum | Uses, Properties, & Compounds | Britannica
2024年12月21日 · Aluminum, chemical element, a lightweight silvery white metal of Group 13 of the periodic table. Aluminum is the most abundant metallic element in Earth’s crust and the most widely used nonferrous metal. Aluminum never occurs in the metallic form in nature.
Aluminium-Iron, Exothermic Reaction, Pyrotechnic - Britannica
Thermit, powdered mixture used in incendiary bombs, in the reduction of metals from their oxides, and as a source of heat in welding iron and steel and in foundry work. The powder consists of aluminum and the oxide of a metal such as iron.
Alum | Definition, Uses, Formula, & Facts | Britannica
2024年11月29日 · The most important alums are potassium aluminum sulfate, ammonium aluminum sulfate, and sodium aluminum sulfate. Potassium aluminum sulfate, also known as potassium alum or potash alum, has a molecular formula of K 2 (SO 4 )·Al 2 (SO 4 ) 3 ·24H 2 O or KAl(SO 4 ) 2 ·12H 2 O.
Aluminum processing - Smelting, Refining, Alloying | Britannica
Aluminum processing - Smelting, Refining, Alloying: Although there are several methods of producing aluminum, only one is used commercially. The Deville process, which involves direct reaction of metallic sodium with aluminum chloride, was the basis of aluminum production in the late 19th century, but it has been abandoned in favour of the more ...
Thermal conductivity | Definition, Science, & Applications | Britannica
2024年12月20日 · Thermal conductivity, the ability of a substance to conduct heat or move heat from one location to another without the movement of the material conducting the heat. Thermal conductivity is measured in watts per meter kelvin (W/mK). For example, solid aluminum has a thermal conductivity of 237 W/mK
Work hardening | Heat Treatment, Strengthening & Tempering
work hardening, in metallurgy, increase in hardness of a metal induced, deliberately or accidentally, by hammering, rolling, drawing, or other physical processes. Although the first few deformations imposed on metal by such treatment weaken it, its strength is increased by continued deformations.
Alumina | Properties, Uses & Production Process | Britannica
2024年12月3日 · Alumina, synthetically produced aluminum oxide, Al2O3, a white or nearly colourless crystalline substance that is used as a starting material for the smelting of aluminum metal. It also serves as the raw material for a broad range of advanced ceramic products and as an active agent in chemical
Aluminum processing - Ores, Refining, Alloying | Britannica
The production of aluminum from bauxite is a two-step process: refining bauxite to obtain alumina and smelting alumina to produce aluminum. Bauxite contains a number of impurities, including iron oxide, silica, and titania.
Water purification | Description, Processes, & Importance | Britannica
2024年12月19日 · water purification, process by which undesired chemical compounds, organic and inorganic materials, and biological contaminants are removed from water.That process also includes distillation (the conversion of a liquid into vapour to condense it back to liquid form) and deionization (ion removal through the extraction of dissolved salts). One major purpose of …