Bentonite 2019-11-07 10:07:41

Introduction Of Bentonite

Bentonite is a clay rock, also known as montmorillonite clay rock, often containing a small amount of illite, kaolinite, halloysite, chlorite, zeolite, quartz, feldspar, calcite, etc.; hardness 1 ~ 2, density 2 ~3g/cm3. According to the type, content and layer charge of montmorillonite exchangeable cations, bentonite can be divided into sodium bentonite (alkaline soil), calcium bentonite (alkaline soil), natural bleaching earth (acid soil or acid clay), among which Calcium-based bentonites include calcium sodium base and calcium magnesium base.

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Foreign name: bentonite

Alias: bentonite; bentonite; porphyry

CAS No.: 1302-78-9

Density: 2~3g/cm3

Boiling point: 381.8 ° C at 760 mmHg

Flash point: 184.7 ° C

Organic bentonite

Organic bentonite is an inorganic mineral/organic ammonium composite. It uses bentonite as raw material and utilizes the lamellar structure of montmorillonite in bentonite and its ability to swell and disperse into colloidal grade clay characteristics in water or organic solvent. The technology is made by inserting an organic covering agent. Organic bentonite can form gel in various organic solvents, oils and liquid resins, and has good thickening, thixotropic, suspension stability, high temperature stability, lubricity, film formation, water resistance and chemical stability. It has important application value in the coating industry. It is also widely used in paint, ink, aviation, metallurgy, chemical fiber, petroleum and other industries.

Bentonite ore

Bentonite is a multi-purpose mineral whose quality and application are mainly determined by the smectite content and type of properties and its crystal chemistry. Therefore, its development and utilization must vary from mine to mine, depending on the role. Such as the production of activated clay, calcium-based sodium, for drilling and grouting for oil drilling, instead of starch for spinning, printing and dyeing paste, building materials for interior and exterior wall coatings, preparation of organic bentonite, synthesis of 4A zeolite with bentonite, production White carbon and so on.

Bentonite processing production process

The method is improved by increasing the activation temperature and pressure of the material and washing the slurry multiple times with a small amount of water, and the quality and decolorization power of the high-efficiency activated clay are greatly reduced.

A semi-wet method for producing high-efficiency activated clay, which comprises: mixing a certain amount of bentonite and inorganic acid;

The mixture is activated at a certain temperature; the activated slurry is flushed to a pH of 4 with a certain amount of water;

And the process of suction filtration into cake, drying, pulverization, etc., the characteristics are: a, the activation temperature and pressure are generally increased to 200-300 ° C and 15 to 40 atmospheres;

The water consumption of the rinsing slurry shall be divided into several equal parts on average, and the slurry is washed successively.

Main use of bentonite

Because bentonite has good water swellability, dispersion and suspension and pulpability, it is used in drilling mud, flame retardant (suspended fire extinguishing), sewage treatment; it can also be used as filler in the paper industry to optimize the performance of coatings. Focus, hiding power, water resistance, scrub resistance, etc.; because of the good adhesion, it can replace the starch used in the textile industry. The sizing of the yarn is both grain-saving and not hairy, and it does not emit odor after the paddle. Double wins in one fell swoop.

In general, sodium montmorillonite (or sodium bentonite) is better than calcium. However, the distribution of calcareous soil in the world is much wider than that of sodium soil. Therefore, in addition to strengthening the search for sodium soil, it is necessary to modify the calcareous soil to make it a sodium soil.

Bentonite (montmorillonite) can be used as binder, suspending agent, thixotropic agent, stabilizer, purification decolorizer, filler, feed, catalyst, etc. due to its good physical and chemical properties. It is widely used in agriculture, light industry and cosmetics. In the fields of medicines and the like, montmorillonite is a natural mineral material with a wide range of uses.

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