Bentonite is a type of natural clay with a predominant composition of montmorillonite, which has wide applications in industry due to its high water absorption, swelling and adhesion properties. This material is divided into two main types, sodium and calcium, and is used in the foundry industry, oil and gas drilling, water treatment, agriculture and animal feed production. The ability to create a gel-like structure and good chemical resistance have made bentonite a versatile and valuable material in industrial and engineering processes.
Chemical analysis of bentonite usually involves determining the percentage of silica (SiO₂), alumina (Al₂O₃), iron oxide (Fe₂O₃), calcium oxide (CaO), magnesium oxide (MgO), sodium (Na₂O), and potassium (K₂O). Its chemical composition depends on the origin and type of bentonite; in sodium bentonite, the percentage of Na₂O is higher and provides greater swelling properties, while calcium bentonite has more CaO. Also, the amount of minor additives and moisture has a direct impact on its quality and industrial performance.
Sodium bentonite is one of the main materials in the preparation of casting molds due to its outstanding plastic properties and high adhesion. In this process, the adhesive property of bentonite causes the sand particles to bind together and strengthens the mold structure. Also, the plastic property of this material causes the sand to compact well under pressure and maintain the desired shape of the mold, without cracking or breaking. These properties enable the production of metal parts with high dimensional accuracy and a desirable finished surface. In addition to its use in sand molding, bentonite is also used as a valuable preservative in the production process of iron, steel, and cast iron alloys. Its effective role in quality control and improving the mechanical properties of metal products has created a special place for bentonite in the foundry and metallurgical industries, making it a vital option for industrial production.
Sodium bentonite, with its excellent plasticity and adhesion, in addition to withstanding harsh working conditions, helps create strong and precise casting molds. This feature allows sand grains to be uniformly bonded and the mold shape to be maintained under high pressure and temperature. Such a feature makes bentonite the best option for producing high-quality metal parts with a desirable surface finish and reduces mold repair or rebuilding costs. Our company produces bentonite with a stable purity and composition by using high-quality raw materials and controlled processing. Our expert team ensures that the products offered comply with global standards. In addition, fast delivery, technical support in product selection and application, and competitive prices make us a superior choice for your foundry and metallurgical industry needs.
| Specification | Test Property |
|---|---|
| 16 m³/tonne (min) | Yield Point |
| 15 ml (max) | Water Loss |
| 10% (max) | Moisture |
| 2 wt% (max) | Residue on ASTM Sieve No. 100 (dry method) |
| 2.5 wt% (max) | Residue on ASTM Sieve No. 200 (water method) |
