The Use And Classification Of Bentonite

- Sep 15, 2017 -

At present, all the bentonite according to the needs of different markets processed into different types, the annual demand is also different, respectively, casting bentonite 1.1 million tons / year, drilling mud bentonite 700,000 tons / year, iron ore pellets with bentonite 450,000 tons / Year, active clay 42 million tons / year, other desiccant, paint, sewage treatment use is relatively small no exact statistics.

 

Cast bentonite

Bentonite as a raw material processing molding sand binder, sand binder is a binder and sand mixed with sand after the sand into a binder film, so that the sand adhesion to each other, so as to give sand and the core with sufficient strength So that it can not be deformed and broken during handling, assembly and pouring. It is mainly used in high pressure modeling, gas punching, static pressure modeling, and no shock vacuum pressure molding.

Bentonite according to its composition is mainly divided into sodium bentonite and calcium bentonite, interlayer cation Na + called sodium bentonite; interlayer cation Ca + called calcium bentonite.

 

Natural sodium bentonite characteristics: good reusability, high moisture pressure, can absorb more water, forming a strong, high cavity strength, in the casting can be fully prevent sand, scarring, out block, sand collapse, Conducive to the metal industry, wet casting.

 

Artificial sodium bentonite is processed by calcium bentonite, all aspects of performance are not as natural sodium bentonite, but the natural sodium production is less, can not meet the market demand, so later found through the method of calcium processing to make up for natural Lack of sodium.

 

Calcium-based bentonite chemical structure is the main structure of divalent calcium ions, destined its performance is not as sodium bentonite, its main role in the light castings sand binder.

 

Bentonite is an important feature: bentonite has a certain heat resistance, through the combination with the water to show. Bentonite adsorbed water at 100 ℃ high temperature will take off free water, and does not affect its ability to bond; at 200 ℃ high temperature will be firmly combined with water will be off; at 200 ℃ above the high temperature lattice water (Hydrogen ions and hydroxide ions in the form of mineral crystal lattice in a certain location of the water), the general water in the hundreds to thousands of degrees can not be completely removed from the water, this part of the water off Except after it became dead clay. The failure temperature of natural sodium bentonite is 638 ℃. The different failure temperature of artificial sodium bentonite is different, but it is generally lower than that of natural sodium bentonite, and calcium bentonite is 316 ℃.


Drilling mud bentonite

Drilling mud Bentonite is mainly composed of montmorillonite, which can absorb 8 times its own water, the volume can be increased 8-12 times in the aqueous solution was suspended and gelled state.

 

Its main purposes are: protection of the wall, on the back to the cuttings, lubrication drilling, to prevent corrosion, can also be made of mud thickener, latex stabilizer, oil-in-water slurry and anti-high temperature solution agent to cool the drill.


Iron ore pellets

Bentonite can stabilize the pelletizing process of iron ore pellets. The best range of water in the general iron ore pellet is narrow, and the bentonite can tolerate a wide range of water. When the raw material is too much water, the bentonite can absorb too much water So that the ball is not affected.


Activated clay and granular clay

Activated clay directly replace the role of activated carbon effect, mainly used in oil, oil paraffin, wax oil, kerosene and other minerals decolorization and purification and oil cracking; animal and vegetable oil refining, for decolorization purification, off the harmful pigments, Phospholipids, saponin, cotton, etc., making it a high-grade edible oil.


Bentonite desiccant

Bentonite desiccant is also called montmorillonite desiccant, clay desiccant, fast water absorption, low cost, non-toxic, tasteless, non-contact corrosion, no environmental pollution


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