Andalusite

Andalusite is a typical mineral of low-grade thermal metamorphism. It forms in mudstones that sit in contact with metamorphic zones. The mineral develops mainly under a high geothermal gradient and a low pressure to temperature ratio. Andalusite usually grows as columnar crystals, and its cross section is almost square. The crystals gather into radial or granular groups. A radial cluster is often called a chrysanthemum stone, because the group looks like the petals of a chrysanthemum. Colors include pink, red, purple, green, red-brown, off-white, gray-yellow, and light green, with a glass luster. Some clear crystals of good quality are treated as gems. The mineral is the primary component in refractory material of this type, and it carries a high alumina content. Other minerals and additives can be added to adjust specific properties for different applications.

Topower processes the mineral in Shandong, China. Step one is raw material quality control, which covers physical and chemical testing. Step two is crushing and grinding of the bulk raw material. Step three is packing after quality testing. The material is then shaped into refractory bricks or castables and fired at high temperature. That firing step builds a stable structure that holds up under extreme heat and repeated thermal cycling. Heated to 1300°C, it turns into mullite, which is a high-grade refractory material.

Topower supplies four grades, set by alumina content: 55%, 56%, 57%, and 58%. Al2O3 runs from 55.0% in the 55% grade to 58.9% in the 58% grade. SiO2 falls from 42.5% to 38.5% across the range. Fe2O3 is 1.20% in the 55% and 56% grades, and 0.80% in the 57% and 58% grades. TiO2 runs from 0.3% down to 0.15%. CaO, MgO, Na2O, and K2O are controlled at the values in the technical data table. Higher grades carry tighter impurity limits. Grade choice follows the alumina level your brick or castable formula calls for. Grain size then follows the mix design, often paired with Tabular Alumina aggregates. Contact Topower to confirm which grade fits a given lining or mix, or for pairing with SK33 SK34 Fireclay Brick lining designs.

The product ships from 200mesh fine powder up to 3-5mm coarse aggregate. Particle size depends on the grade, as listed in the specification table. The 55% grade ships in 0-1mm, 1-3mm, and 200mesh. The 56% grade adds 3-5mm. The 57% grade ships in 0-1mm, 1-3mm, 3-5mm, and 200mesh. The 58% grade is supplied in 0-1mm. Bulk material goes into 25kg kraft paper bags, stacked on sea fumigated wooden pallets. Fine powder grades use the same bag and pallet format for export. Grain size and grade can be matched to a customer mix design on request, similar to our White Fused Alumina packaging. Coarse andalusite grain and fine andalusite powder ship in the same export packing format.

Refractory material made from this mineral serves as a lining in furnaces, kilns, reactors, and other high-temperature equipment:

- High-grade refractories for the smelting industry
- Refractory bricks and low-creep blocks
- Raw material for technical ceramics
- Linings in furnaces, kilns, and chemical reactors
- High-temperature equipment across heavy industry
- Lightweight silicon-aluminum alloy smelting for metal fibers
- Guide-type supersonic aircraft and spacecraft parts

Its thermal properties suit duty that needs reliable insulation and stability in extreme heat, frequently specified in high-performance High Alumina Castable formulations. The mineral also feeds the smelting industry, refractory brick production, and the technical ceramics sector as a versatile Refractory Raw Material. It can be used to smelt high-strength lightweight silicon-aluminum alloys. Those alloys then go into metal fibers and into guide-type supersonic aircraft and spacecraft. Because the material keeps low thermal expansion, linings stay stable when furnace temperatures cycle up and down.

Packing follows a safety sea-exporting packing standard. Topower packs the material in 25kg kraft paper bags or 1000kg big bags on sea fumigated wooden pallets with shrink wrapping. Dispatch loads the finished, packed material at the factory into containers, door to door. A chemical test report from CNAS covers the content of the mineral. Ask for the report with your order, or Contact Us for customized technical support.

Q: What is a chrysanthemum stone?
A: A radial cluster of this mineral is often called a chrysanthemum stone. The name comes from the crystal group, which looks like chrysanthemum petals. Andalusite powder is the common search term for the fine grade.

Q: Which grades does Topower supply?
A: Topower supplies 55%, 56%, 57%, and 58% grades, based on Al2O3 content, with grain sizes from 200mesh to 3-5mm.

Q: What is the MOQ, and can I get a sample and a price?
A: The MOQ is 5 tons. It ships in 25 kg kraft paper bags on sea fumigated wooden pallets. Send your grain size, quantity, and destination port, and we will return a quotation.

Q: What does andalusite become at high temperature?
A: Heated to 1300°C, it converts to mullite, which is a high-grade refractory material.

Q: Where is andalusite used?
A: It is a raw material for refractory bricks and technical ceramics, and a lining material in furnaces, kilns, and reactors. It also feeds lightweight silicon-aluminum alloy smelting.

Q: How is it packed for export?
A: In 25kg kraft paper bags on sea fumigated wooden pallets, loaded at the factory for door to door container delivery.

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