Hindalco’s specialised alumina and hydrates are products of the technological innovations of our R&D team. We offer a wide range of speciality alumina and hydrates for various industrial applications:
- Normal soda course aluminas: Calcined alumina is widely used in refractories and in the ceramic industry. Their specific properties include extreme hardness, refractoriness, high mechanical strength and resistance to wear abrasion, chemical attack, and corrosion. These are used as feed material for fused alumina, refractory aggregates, etc. Coarse alumina grades are white crystalline powders that are predominantly alpha alumina of high chemical purity and consistent physical properties. These products have excellent grindability.
- Medium and low soda course alumina: Medium and low soda course alpha aluminas consist of friable aggregates of crystallites having easy grindability and are used in the manufacture of wear-resistant ceramic liners, as well as in industrial ceramics and electrical insulators.
- Medium and low soda fine alumina: Medium and low soda fine aluminas are predominantly in the alpha phase, with controlled particle-size distribution. They are widely used in special refractory bricks and shapes, refractory gunning mixes, wear-resistant ceramic parts, ceramic liners, grinding media, HVDC / HVAC insulators, etc., when used for high-temperature applications. These low soda grades provide excellent hot strength to the refractory body.
- Normal soda fine alumina: These are predominantly fine, alpha aluminas of about 5µm with controlled particle-size distribution. They are widely used in high-alumina refractories, concast shapes, grinding media, high-tension insulators, ceramic liners, etc.
- Reactive fine alumina: These grades are predominantly alpha aluminas having wider particle-size distribution. They yield a low water demand with very good flow properties when used in low-cement castables, ULCC and self-flow refractory mixes. They are also recommended for usage in grinding media, wear resistant ceramic components and liners, owing to their superior packing characteristics.
- Reactive ultrafine alumina: These reactive alumina grades are white crystalline alpha alumina powders developed for specialised ceramic and refractory applications. These aluminas are characterised by high reactivity, low water absorption and controlled particle-size distribution. Typical applications include low cement and ultra-low cement castables, slide gates and refractory bricks, resistor cores, new generation ceramics and wear-resistant ceramic parts.
- Polishing alumina: These grades are developed through controlled calcination and processing in order to obtain consistent particle hardness, shape and size distribution. They provide a choice of oil absorption values within the product range. These are recommended for use in solid bars, emulsions and pastes for metal and stone polishing applications.
- Coarse alumina hydrates: Alumina hydrate, a crystalline white powder, is available in both moist and dry forms. Coarse alumina hydrates are recommended in the manufacture of aluminium sulphate (alum), PAC (Poly Aluminium Chloride), zeolite, aluminium fluoride, glass, etc.
- Fine alumina hydrates: These are fine white powders, with average particle size ranging from 5 to 15µm. They are used as fillers in paper and in SMC / DMCs; they also function as flame retardants in latex, rubbers, plastics, etc.