Bauxite actually refers collectively industrially utilized to gibbsite, a boehmite or diaspore a mainly consisting of mineral ore. Bauxite has a wide range of uses in China's industrial field. The annual demand for bauxite in China is very large. This article will give you a brief introduction to the main beneficiation process of bauxite.
Bauxite, also known as bauxite, is a mixture of finely dispersed colloids composed of disulfide, boehmite and gibbsite in various proportions. Bauxite often coexist with oxides and hydroxides, anatase and kaolinite, chlorite clay minerals such as iron. Sometimes it also contains minerals such as calcium, magnesium and sulfur. Bauxite ore can be divided into high alkali bauxite, high titanium bauxite or high iron bauxite according to the impurities contained in it.
The process of sorting bauxite concentrates from bauxite ore is actually a process of removing gangue minerals and harmful impurities, separating high-alumina minerals and low-alumina minerals to obtain high-aluminum-silicon ratio concentrates.
The main beneficiation methods of bauxite include washing, flotation, Magnetic Separation and chemical beneficiation. Washing is the simplest and most effective way to increase the ratio of aluminum to silicon in bauxite. The ore can generally increase the ratio of aluminum to silicon by about 2 times, which is more effective for the sorting of loose ore. Washing is often combined with other sorting methods to form a washing (screen washing) grading - hand selection process.
Flotation can be used to separate boehmite and kaolinite, using oxidized paraffin soap and tar oil as collectors , in an alkaline medium. Magnetic separation is used to separate iron-containing minerals. The chemical beneficiation mainly consists of roasting and desiliconization. This is based on the fact that the main silicon-containing mineral in the ore is hydrous aluminum silicate. After calcination, part of Si()z is transformed into amorphous crystals, which are easily soluble in alkali, and the aluminum is improved. Silicon ratio.
In general, the main beneficiation process of bauxite will use different beneficiation processes depending on the type of ore. For example, the beneficiation process of gibbsite-kaolinite bauxite is often carried out by first selecting mud and sand, and after coarse grinding, removing iron by magnetic separation, and flotation after ore grinding. The flotation reagent was prepared with oleic acid, tal oil and engine oil in a ratio of 1:1:1.
The bauxite flotation concentrate grade contains 49.65% alumina and the recovery rate is 45.3%. A1203/SiO2 is 12.3. And high-silica bauxite desilication beneficiation process, the flotation method is more effective, has an aluminum mineral collector and fatty sulfonates, adjusting agents are sodium hexametaphosphate, tannic acid, sodium pyrophosphate, soda ,Sodium carbonate. The high-iron bauxite ore dressing process will adopt different methods of iron removal according to the content, type and embedding characteristics of iron minerals. Common magnetic separation, roasting magnetic separation, carrier flotation de-ironing.
In general, the method of beneficiation of bauxite is complicated. In the process of beneficiation, the corresponding beneficiation process should be selected according to the type and characteristics of the ore. At present, China's bauxite is mostly used for flotation by flotation.
The Magnetic beneficiation process or Magnetic Separation Process is to separate the iron ore with Magnetic Separator, which is also an environmental solution compared to Flotation Process , this solution is mainly used for iron ore or the other solution which needs to remove the iron impurity, such as it needs to remove the iron for the quartz ore processing plant and feldspar ore processing plant.
On the magnetic separator there are mainly two sections, magnetic section and non-magnetic section, during the slurry flows through the magnetic separator, the non-materials will be thrown out while the magnetic material will stay on the magnetic drum for a longer time, and discharged at the rear output. So they are effectively separated, for different kinds of iron ore, the magnetic field strength is different,by which it can be divided into common magnetic separator and high density magnetic separator. The density ranges from 1000-15000 Gauss.
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