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Introduction to the characteristics and uses of sodium bentonite
Release time:
2024-05-24
Sodium-based bentonite is a high-performance and multi-purpose mineral. Its quality and application field mainly depend on the content, attribute type and crystal chemical properties of montmorillonite. Therefore, the mining value of bentonite raw materials must be determined by the quality of the ore. For example: drilling mud, textile sizing, waterproof and anti-seepage, construction mortar, bentonite waterproof blanket, bentonite particles, interior wall coatings, industrial starch, organic bentonite preparation, montmorillonite extraction, and the production of synthetic 4A zeolite, white carbon black production and so on.
The difference between calcium-based bentonite and sodium-based bentonite is generally distinguished according to the type and content of exchangeable cations between montmorillonite layers: the alkaline coefficient of sodium-based bentonite is greater than or equal to 1, while the alkaline coefficient of calcium-based bentonite is less than 1.
characteristics of sodium bentonite:
(1) Plasticity
Sodium-based bentonite it has a strong plasticity, in the industrial casting of sodium-based bentonite can effectively inhibit the sand in the casting, scarring, caking and sand collapse, significantly improve the surface finish of the casting, and reduce the scrap rate. Therefore, high-quality sodium bentonite is an ideal choice for precision casting;
(2) Cohesion
Another characteristic of sodium-based bentonite is good adhesion, and it can also be used as a foundry sand binder in the foundry industry. Therefore, sodium-based bentonite is a common sand binder for ordinary and precision castings;
(3) Dispersion
Natural sodium-based bentonite has higher C- axis order, finer particles and stronger dispersion than artificial sodium-based bentonite;
(4) Expansion
Sodium bentonite also has a good physical process. The main manifestations are: slow water absorption, but large expansion rate; high cation exchange capacity;
(5) thixotropy
Sodium bentonite has strong hydrophilicity, fast dissolution speed, good dispersibility and high colloidal value in aqueous medium; its colloidal suspension has good thixotropy, viscosity, lubricity and high pH;
Sodium-based bentonite is divided into two kinds, one is naturally formed natural sodium-based bentonite, and the other is artificial sodium-based bentonite. In fact, these are two different products, each with advantages and disadvantages. China's natural sodium-based bentonite ore reserves are insufficient, the output is small, in the industry is obvious short board, poor reusability, but good performance. Artificial sodium-based bentonite has good reusability, low cost and high output, which can effectively meet the factory demand of metallurgical pellets and casting sand, but it is slightly worse than natural sodium-based bentonite.
5 big use of sodium bentonite:
In the mechanical casting industry, artificial sodium bentonite can be used as casting sand and binder, which can overcome the phenomenon of "sand inclusion" and "peeling" of castings, reduce the scrap rate of castings, and ensure the accuracy and smoothness of castings.
In the paper industry, sodium bentonite can be used as a filler for paper to enhance the brightness of the paper.
The use of the strong bonding properties of this product, sodium bentonite for white latex, floor glue, paste and other production.
Because of the sodium bentonite has stable suspension and thickening, it can effectively support and disperse powder, and can be used as thickening and anti-precipitation additives for water-based coatings.
⑤ At the same time, sodium bentonite can be used as drilling mud soil by using its excellent dispersion and expansion, high slurry rate, low water loss, colloid performance and shear dilution ability.
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