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Alumina Bauxite is an oxide of aluminum that is stable. It’s also used in ceramics, material science and mining. The rapid development of our country’s electrolytic aluminium, ceramics industries, medicine, electronics and machinery will increase the demand for alumina.
There are many ways to extract alumina from ore. These include the Bayer method and other methods such as soda-lime sintering. The Bayer Process was the primary method for producing aluminum, with its output accounting for approximately 95% of total global alumina output. Although the acid method made huge progress in the 1970s it was not used by industry.

Bayer Process: A new way to produce alumina

The Austrian Bayer K.J.Bayer invented it in 1888. The principle is that caustic (NaOH solution) is used to warm and dissolve the alumina in the bauxite, resulting in sodium aluminate. After the residue is removed (red mud), temperature is lowered and aluminum hydroxide added as a crystal seed. After long stirring, the sodium-aluminate solution is separated to aluminum hydroxide. Then, it’s washed off and calcined in a temperature range of 950-1200. The alumina is obtained. Mother liquor is the solution that remains after precipitation.

Because gibbsite and diaspore are different in their crystalline structure, they will dissolve at different temperatures. The gibbsite-type bauxite dissolves at temperatures between 125 and 140, while diaspore-type bauxite dissolves at temperatures between 240 and 260. Lime (3-7%) is also added.

Bayer Process Alumina Products: Benefits

The Bayer Process is a modern process that has achieved major progress.

1. Equipment of large scale and continuous operation
2. Automating production processes;
3. Energy-saving techniques such as fluidized roasting, high-pressure enhanced disolution and high pressure enhanced dissolution;
4. Production of alumina for aluminum electrolysis, and the need for dry purification. Bayer’s 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. The Bayer Process will generate about 0.8 kg of NaOH for every kilogram of SiO2 present in the ore. The Bayer process has a worse economic impact the lower the aluminum-silicon bauxite ratio. The Bayer Process produced bauxite with an aluminum-silicon composition greater than 8 until the late 1970s. In order to make the most of the diminishing resources of gibbsite bauxite, research and development has focused on finding new ways to save energy and using other low-grade resources.

(aka. Technology Co. Ltd., a global chemical material manufacturer and supplier with over 12 year’s experience, is a trusted source for high-quality chemicals. The Aluminum Oxide The products produced by our company are high in purity, have fine particles and low impurity levels. Contact us if you have any questions.