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Bauxite beneficiation method, bauxite beneficiation process


Introduction to Bauxite

Bauxite can be used in many fields, and the industrial utilization rate is relatively wide. The bauxite we are talking about is actually bauxite. Its main element composition includes gibbsite, boehmite and diaspore , The industry has a great demand for bauxite every year, but the bauxite beneficiation method is more complicated. Here is a brief introduction to the beneficiation process of bauxite.

Classification of bauxite

Bauxite, also known as bauxite, is generally a finely dispersed colloidal mixture composed of three minerals, diaspore, boehmite and gibbsite in various proportions. Bauxite often coexists with iron oxides and hydroxides, anatase, kaolinite, chlorite and other clay minerals. Sometimes it also contains minerals such as calcium, magnesium, and sulfur. Bauxite ore can be divided into high-alkali bauxite, high-titanium bauxite, and high-iron bauxite according to its impurities.

Beneficiation method of bauxite

The process of separating bauxite concentrate from bauxite ore is actually a process of removing gangue minerals and harmful impurities, separating high-aluminum minerals and low-aluminum minerals, to obtain a concentrate with a high aluminum-silicon ratio.

The main beneficiation methods of bauxite include ore washing, flotation, magnetic separation, chemical beneficiation, etc. Ore washing is the simplest and most effective method to increase the aluminum-silicon ratio of bauxite. Generally, washing the ore can increase the aluminum-silicon ratio of the ore by about 2 times, which is more effective for the sorting of loose texture ore. Ore washing is often combined with other sorting methods to form a washing (screening)-grading-hand sorting process.

The flotation method can be used to separate diaspore and kaolinite, using oxidized paraffin soap and tall oil as collectors, in an alkaline medium. Magnetic separation is used to separate iron-containing minerals. Chemical beneficiation mainly includes roasting and desilication. This is based on the fact that the main silicon-containing minerals in the ore are hydrous aluminosilicates. After roasting, part of the Si()z is transformed into amorphous silicon oxide particles that are easily soluble in alkali, which increases the aluminum of the material. Silicon ratio.

Choose method according to ore characteristics

Generally speaking, the main beneficiation process of bauxite will adopt different beneficiation processes according to different types of ore. For example, the beneficiation process of gibbsite-kaolinite bauxite usually adopts first mud and sand separation, coarse grade grinding and then magnetic separation for iron removal, and ore mud grinding and flotation. The flotation reagent is prepared with oleic acid, tall oil, and engine oil at a ratio of 1:1:1.

In fact, flotation is the most commonly used method for bauxite beneficiation, but for some accompanying organisms in bauxite that are not suitable for flotation, it is a different matter. So when you choose bauxite beneficiation technology, It must be determined according to the characteristics of the ore.

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