Stable oxides of aluminum, also known as bauxite in the mining, ceramics and materials sciences industries are what is called Alumina. Alumina demand is still expected to rise due to the country’s rapid progress in electrolytical aluminum and ceramics.
You can extract alumina from any ore using many different methods, such as the Bayer Method, soda lime sintering process and Bayer-sintering mixed method. This method accounts for 95% to all of the global alumina supply. Although the acid method has seen great advancements since the 1970s it has yet to be used in industry.
Bayer’s process for the development of products made from alumina.
Austrian Bayer (K.J.Bayer), invent it in 1888. It works by using caustic soda solution (NaOH), to melt and dissolve alumina into bauxite in order to get sodium aluminate. Once the solution has been separated from its red mud residue, the temperature can be decreased and an aluminum hydroxide seed crystal is made. After long stirring the solution, the sodium alkali is separated and made into aluminum hydroxide. It’s then calcined at temperatures of 950 to 1200. Obtained alumina products. After precipitation of aluminum oxide, the mother liquor is obtained. This solution is then recycled following evaporation.
Gibbsite, diaspore and boehmite have different crystal structures. Because they are not compatible in caustic solution, it is necessary to provide different dissolution conditions, especially different temperature. You can dissolve gibbsite bauxite at 125140. The diaspore bauxite is to be dispersed at 240260. To this, lime (3%) should be added.
Bayer process Benefits of making alumina products
It is here that the Bayer Process has made significant progress.
2. Large-scale, continuous equipment operation
2. Production process automation
3. Energy-saving techniques such as fluidized roasting and high pressure enhanced dissolution
Production of sandy aluminum to meet flue gas and aluminum electrolysis. Dry purification is required. Bayer has many advantages
The economic effect of the Bayer Process is determined by the quality of the bauxite, mainly the SiO2 content in the ore, which is usually expressed by the aluminum-silicon ratio of the ore, that is, the weight ratio of the Al2O3 to the SiO2 content in the ore. Because in the dissolution process of the Bayer Process, SiO2 is transformed into sodalite-type hydrated sodium aluminosilicate (Na2O·Al2O3·1.7SiO2·nH2O), which is discharged along with the red mud. For every kilogram of SiO2 present in the ore, there will be approximately 1 kilogram Al2O3 as well as 0.8 kgs NaOH. A lower aluminum-silicon proportion of bauxite is associated with a worse economic outcome of the Bayer process. The Bayer Process produced a bauxite with an aluminum-silicon content of 7-8 until the mid 1970s. The decreasing resources of high-grade gibbsite-type Bauxite has made it more important to research how to utilize other low-grade bauxite sources and develop new technologies that save energy.
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