Reactive Alumina Has High Purity, Good Particles Size Distribution And Excellent Sintering Activity

Activated Alumina
activated aluminium oxide
Reactive a-alumina micro-powders

Short Description

Reactive aluminas are specially designed for the production of high performance refractories where defined particle packing, rheology and consistent placement characteristics are as important as the superior physical properties of the final product. Reactive aluminas are fully ground down to the primary (single) crystals by highly efficient grinding processes. The average particle size, D50, of mono-modal reactive aluminas, is therefore nearly equal to the diameter of their single crystals. The combination of reactive aluminas with other matrix components, such as tabular alumina 20μm or spinel 20μm, allows the control of the particle size distribution to achieve the desired placement rheology.

CONTACT NOW

Physical and chemical prperties

Refractory grade- Reactive Alumina

Properties Brands	Chemical composition (mass fraction)/%					α- Al₂O₃/% No less than	median particle diameter D₅₀/μm	+45μm grain content/% No less than
	Al₂O₃ content is not less than	Impurity content, not greater than
	Al₂O₃ content is not less than	SiO₂	Fe₂O₃	Na₂O	Ignition Loss
JST-5LS	99.6	0.08	0.03	0.10	0.15	95	3～6	3
JST-2 LS	99.5	0.08	0.03	0.15	0.15	93	1～3	-
JST-5	99.0	0.10	0.04	0.30	0.25	91	3～6	3
JST-2	99.0	0.15	0.04	0.40	0.25	90	1～3	-

Product Features

Reactive aluminas from sub-micron to 3 micron particle size. Particle size distributions, ranging from mono-modal to bi-modal and multi-modal, allow full flexibility in formulation design and provide the convenience of co-milled engineered reactive aluminas.

The reactive alumina micro-powders, made through specially sintering process, grinding process and multistage power size separation, has high purity, good particles size distribution and excellent sintering activity, which is suitable for the application in the production of high performance refrac-tory material, and electronic ceramics products .The reactive alpha alumina micropowerd can be well controlled in particle size distribution in the range of submicron, leading to be with excellent grain packing density good rheological property and stable workability as well as good sintering activity, which play an unique role in refractory:
1. By optimizing the particle accumulation to reduce the addition amount of water
2. The wear resistance and mechanical strength are improved by forming a solid ceramic bonding phase;
3. The high-temperature performance of the product is improved by replacing the ultra-fine powder with low refractoriness.

Reacfive Alumina Ultrafine For High-Performance Refractories

Reactive a-alumina micro-powders can be used in ladle castables, BF trough castables, purge plugs, seat blocks, alumina self-flow castables, and gunning mixes as well, which are produced with reference to standards of a Transnational Corporation. These powders have low impurity,reasonable particle size distribution and reactivity, give castables good flowability, less dilatancy,proper working time, dense structure and excellent strength, and
have been exported to Japan,USA, and Europe.

Reactive Aluminas for High Performance Refractories

The fully ground reactive aluminas are specially designed for the production of high performance refractories, where defined particle packing, rheology and consistent placement characteristics are as important as superior physical prop-erties of the final product.

Product Performance
The highly controlled fine particle size distribution down to the sub-micron range and their excellent sintering reactivity give Reactive Aluminas unique functions in refractory formulations.

Most important are:
• Reduce mixing water of monolithic refractories by helping to optimize particle packing.
• Increase abrasion resistance and mechanical strength by the formation of strong ceramic bonds.
• Increase high temperature mechanical performance by substitution of other superfine materials oflower refractoriness.

Packing:
25KG/bag,1000kg/bag or other specific packing according user’s requirements.