Bauxite beneficiation and processing technology

Bauxite beneficiation relatively simple, generally using hand-selected, like Guangxi Pingguo Aluminum Plant, designed with "three broken two wash - hand-selected process with the development of refractories and aluminum oxide industry, the production of bauxite, the raw material More and more high demands have been put forward. If it is difficult to achieve by relying on the current manual selection, and the resources will be seriously damaged, it is a very urgent problem to build a scale production plant as soon as possible.
Due to the use of bauxite as a raw material for aluminum smelting, different smelting methods have different quality requirements. Bayer process alumina-silica ratio of greater than 8 to 10, 5 to 7 combined method, sintering rule 3.5 to 5.0, so as aluminum smelting raw material selected from bauxite, aluminum-silicon other than the primary task is to increase, while the oxidation of iron ore will The productivity of the dissolution vessel during the Bayer process is reduced, the clinker temperature during the sintering process is lowered, and the alumina is prevented from being converted to sodium aluminate. As a raw material for refractory materials, it is also necessary to reduce the content of TiO2. Titanium and iron impurities in the ore cause the refractory material to appear prematurely at a high temperature to lower the performance of the refractory material. In addition, in the sintering process of bauxite, potassium oxide and sodium act as a primary mullite that hinders the progress and decomposition of secondary mullite, causing damage to the network structure and greatly reducing the load softening point of the refractory material. . At present, research and experiments on the removal of titanium and iron impurities by flotation desiliconization, mechanical or chemical treatment, and the removal of potassium and sodium impurities by corresponding measures are underway. The selection of bauxite has been carried out. Agenda.
China's alumina production mostly adopts the combined method, that is, the combined method of mixing, which treats most of the easily soluble diaspore in the Bayer process, converts the insoluble or insoluble part into the sintering method, and re-matches it in the sintering method. Into some bauxite to improve the grade. Alumina is produced by this method, such as Zhengzhou Aluminum Plant, Shanxi Aluminum Plant, Guizhou Aluminum Plant, and Zhongzhou Aluminum Plant.
Shandong Aluminum Plant uses a sintering method to treat aluminum-silicon-to-siliconite with a ratio of 3 to 5, and Guangxi Pingguo Aluminum Factory is the only aluminum plant in China that uses Bayer to produce alumina.
Molten salt electrolysis is used in the production of primary aluminum in aluminum plants in China. Electrolytic aluminum is a high-energy product. The electricity consumption per ton of aluminum is about 16,000 kWh. In 1996, the electricity consumption of electrolytic aluminum in China was about 30.4 billion kWh, accounting for 3.0% of the national power generation.

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