1 foundry industry 

Bentonite casting bentonite is the largest user, the amount of 1.1 million tons per year.

Bentonite clay is mainly used in the adhesive used in casting sand, because bentonite has a strong bond, high plasticity, stripping good, excellent permeability, stable physical and chemical properties at high temperature and wet conditions and so on. Clay bonded molding materials for the production of sand castings, this is a historic process methods in a variety of chemically bonded sand flourish today, green sand is still the most important modeling materials, its broad scope of application, consumption large, any other shape materials can not be compared. New technology Modern high pressure molding, injection compression molding, gas Chong modeling, static pressure molding and vacuum-pressure shock-free modeling, etc., are also using green sand as a precondition, green sand molding conditions, strong ability to adapt . Casting bentonite mainly sodium and calcium bentonite sodium bentonite categories, sodium bentonite is processed from natural sodium bentonite or artificial sodium bentonite, for its reusability and good green strength and welcomed by the foundry industry . Because with good plasticity, can curb casting sand, scarring, off the block, sand landslides and other phenomena, coupled with formability, high strength cavity to facilitate the metal casting industry, wet or dry mold, precision casting choice sand binder. Sodium bentonite, calcium from natural sodium bentonite, calcium-based processing, is widely used in casting light sand binder. It is practical and sand casting convenient and popular with users. Compared with other binder, there is an important characteristic of bentonite is that it has a certain heat capacity. As long as the heating temperature is not too high, in addition to removal of free water bentonite Just add water can still recover the ability to stick. Bentonite bonding capacity only after the addition of water to show it. Bentonite loses adhesive ability, and it is also related to dehydration. So far, that the bentonite moisture in three forms: a water-free water, i.e. water adsorption of bentonite particles, heated to above 100 deg.] C, free water can be removed, removal of the free water in addition to bentonite, bonding capacity unaffected; two kinds of water is strongly bound water, prolonged heating at 110 ℃, bentonite free water can be removed completely, but will not remove strongly bound water. Free water has been completely removed bentonite, reheat will continue weight loss at higher temperatures (e.g. 200 ℃, 300 ℃), illustrates still water loss. Bentonite After this heat dehydration, as long as the water can be fully restored bonding capacity; three kinds of water lattice water, was also known as structured water. Lattice water only at relatively high temperatures in order to partially or fully removed. After the swelling water lattice water removal, namely the loss of bonding capacity, become a dead clay. Different bentonite, loss of bonding capacity of different temperatures. By differential thermal analysis experiments show: In general, natural sodium bentonite failure temperature of 638 ℃, calcium bentonite is 316 ℃. Artificial activation of sodium bentonite, due to the activation of different conditions, failure temperature varies, but are lower than the natural sodium bentonite.

2 drilling mud

Bentonite drilling mud used bentonite is the second largest user, the annual amount of 70 million tons.

Bentonite is a montmorillonite as a main component of clay minerals, have a strong water absorption, the equivalent volume itself can absorb water 8 times, the volume expansion of 10 to 30 times, in suspension in aqueous solution and gelled . During oil and gas drilling and other work, to use the mud to cool the drill bit and remove the debris, the protection wall and a balanced pressure. Bentonite dispersion, and a large amount of slurry is therefore an ideal material for drilling mud. Bentonite drilling mud used, the most important technical requirement is suspended nature, wet sieve analysis and moisture content.

Bentonite in the drilling of the important role that it's very large amount. It is understood that, taken per well, about the use of bentonite 8 tons.

3 iron ore pellet 

Iron ore pellets used bentonite bentonite is the third largest user, the annual amount of 45 million tons.

Iron ore pellets using Bentonite is one of the important material attached modern metallurgical industry, will roll into a ball, after iron ore plus the amount of bentonite and water are mixed in a pelletizer and then dried preheated baking to form a high strength pellets then smelting.

4 activated clay and clay particles

Activated clay bentonite is processed with a chemical product having multiple functions of activated carbon, and inexpensive than the activated carbon. It is widely used in all kinds of mineral oil refining decolorization oil industry, oil industry, animal and vegetable oils, solid, liquid paraffin, fatty acids, oil regeneration, ethanol and benzene. Can also be used for wine and juice clarification, juice purification of the sugar industry, the chemical industry catalyst carrier, powder pesticide Tim materials.

Activated clay of about 40 manufacturers, the annual output of about 42 million tons. The largest production plant capacity of 50,000 t / a. Activated clay origin mainly in the northeast, north, east and other regions, it accounted for more than 70% of the country. At present, China's demand for activated clay is 650,000 t / a or so, annually imports about 40,000 tons.

Clay particles are activated clay as the main raw material, scientific formula, chemical treatment is made, the appearance of not stereotypes small granular, activated clay than higher specific surface area and particle strength, stability, selectivity, having high adsorption capacity, widely used in the petrochemical industry aromatics purification, refining aviation kerosene, also used in oil refining lubricating oil, base oil, diesel, oil removal of residual olefin resin and asphaltene, basic nitride and other impurities. At present, the main alternative to clay particles American TONSIL clay particles, for aromatics olefin removal, aviation kerosene, solvents, oil refining, refined benzene, serve to remove a small amount of nitride, resin and pigment and so on . Clay particles, sometimes called silicone oil filter, oil filter using silica gel can be a good quality, and the removal of acid sludge, bio-colloids, insulating material extract, can remove water impurities and chromatographic analysis of hydrocarbon gases can be used in sewage treatment and toxic filtration and petrochemical industrial gas oil cracking.

5 desiccant

Bentonite desiccant adsorption activity, static dehumidification and odor removal and other effects. Can not be used widely used in seals, gas seal products, such as: optical instruments, electronic products, medical care, food packaging and dry air of civilian and military products product archive. Compared with silica gel having low prices, fast absorption, preparation and low cost. And currently marketed for other types of desiccant, compared not only adsorption speed, high adsorption capacity and non-toxic, tasteless, non-corrosive exposure, no environmental pollution, etc., especially used in food packaging, the human body without harm.

Bentonite desiccant export a large amount.

6 litter (bentonite particles)

Cat litter (bentonite particles) using high-quality natural bentonite, high temperature drying refined, with bright white appearance, strong adsorption, the proportion of small features, durable, suitable for the family pet hygiene purposes.

Cat litter (bentonite particles) exports a large amount.

7 Sewage Treatment

With bentonite gasket material handling animal waste, animal manure odor bentonite allows easily dispersed, cleaning. Since the field of captive animals and slaughterhouses, fish processing plants produce sewage odor harmful to the environment, you can sprinkle the bentonite in these places, recycling and efficient fertilizer.

Bentonite muddy water can be used as a clarifying agent, water repellent contaminated water, sewage treatment agent. Dyeing wastewater treatment with bentonite, coal washing waste water, monosodium glutamate factory waste water, waste, removal rate of 99.5%.

In the reservoir upstream of the reservoir can spread contaminated material bentonite flocculation sink storage to be addressed by the end of biological purification.

8 Architectural Engineering

On the use of bentonite lubrication, sealing adhesive, thickening and gelling of the mud made for a variety of soil impermeable liner operations, such as the wall construction, grouting, caissons, piling, land seepage, cement and concrete additives, construction, water conservancy solid transport, sewage treatment and tunnel shield lubrication.

Shop with bentonite impermeable layer of river, the water can be directed to the limited distance. Waterproof layer of natural sodium bentonite powder is available directly shop, you can also use the local soil mixed with bentonite compaction can also bentonite sandwiched between two layers of fabric to form a watertight (permeability) blanket (plate), rapid since the construction of tanks, reservoirs water kiln, aqueducts.

Do bentonite waterproofing materials, such as corrugated board-mounted bentonite waterproof board, nonwoven fabric sandwiched between two layers of bentonite intermediate layer waterproof felt and non-woven layer of plastic plate clamp double of bentonite waterproof board, the material has been in the subway, the bottom of the dam, landfill site under construction in large quantities. Bentonite is highly watertight and self-repair function recovery, its water has compactibility (sodium bentonite is formed in the diaphragm pressure state, a thickness of about 5mm, the equivalent of 100 times the density of 30cm thickness of clay), self-protection water good performance (when the reaction of sodium bentonite and water, having a l3-l6-fold expansion of power, it can repair the concrete surface cracks within 2mm) and with a permanent waterproof performance (sodium bentonite aging or corrosion will not occur) and other features. Bentonite harmful to humans, has excellent environmental performance. Construction is simple. Does not require heating and paste, the temperature is not affected. At the same time, short construction period, and other waterproof materials, the construction is relatively simpler than soft. Only with nails and washers. After the construction does not require special inspection, if found defective water is also easy to repair.

9 Food

As food additives and emulsifiers in foods can be used as calcium supplements and diet food.

Bentonite make juice, juice clarification.

Bentonite can soften hard water.

Bentonite to fix nitrogen does not precipitate the way for wine clarification, reducing the formation of hydrogen sulfide and the formation of acetaldehyde, eliminate all extraneous odors.

10 Paint

Bentonite is used in the paper industry multifunction white paint, also played in the pulper anti-pitching an adsorbent, from the agent role in keeping machinery, from the rheological modifier in the pulp.

Bentonite can also produce coatings. As viscosity modifiers and mineral fillers in white paint, it can replace some or all of titanium dioxide; may also be partially substituted polyvinyl alcohol, and as a non-woven adhesive gypsum board particles.

Bentonite oxidized starch adhesive may be modified, both to improve the solid content of the rubber to reduce the moisture, but also to plug and fill the paper fibers (especially grass pulp and paper) gap, reduce moisture permeability, thereby improving the stick tack agent and drying speed. Bentonite proved effective, and low price, is the ideal drying agent.