Bauxite Ore Extraction Process
Bauxite processing is relatively simple and hand dressing is used commonly. The design is that: washing for three times, crushing for two times and hand dressing for one time. Along with the development of refractory material and alumina industry in our country, the production of bauxite raw materials is put forward higher and higher demand.Bauxite is main material in aluminium making. Silica is main detrimental impurities in alumina making. Bauxite ores has many uses and the most important one is that bauxite is used as metal aluminium refining and refractory material and abrasive materials and high aluminium cement material in aluminum industry.
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Bauxite Ore Processing Flowchart
For bauxite is considered to be smelting aluminum material, different smelting method has different quality requirements. Silicon / aluminum ratio Bayer greater than 8 ~ 10 in 5 ~ 7, the combination process and 3.5 ~ 5 in sintering process. As a result of melting aluminum material, the primary task in the bauxite dressing is to increase the ratio of Si / Al. At the same time, iron oxide ore will reduce the productivity of the dissolution kettle in the Bayer process, reduce the sintering process of the clinker temperature, to prevent the alumina to become sodium aluminate. At present, ore is fine grinding, and then through the flotation of desilicication, high gradient strong magnetic iron removal and corresponding measures, to remove impurities, such as potassium, sodium, sub bauxite will become bauxite has good quality.
Bayer process is the main industrial production method of alumina production. Bayer process is suitable for treating low silica bauxite with good quality, but it is not suitable for iron ore and aluminum. The production process is: the pressure cooker, caustic leaching for bauxite, so we can get the sodium aluminate solution. Then dilute sodium aluminate solution. And then with the aluminum hydroxide seed (or seeds) will be stirring, sodium aluminate was decomposed to obtain aluminium hydroxide. Product alumina will be obtained by calcination. After evaporation, the crystal seed decomposition in the mother liquor back for bauxite leaching. Bayer process is suitable for low silicon bauxite with good processing quality.
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