ISO9001 Certified Al2O3 99.3%Min Sintered White Tabular Alumina for Refractory Materials

Introduction of slab corundum
The platy corundum is a pure sintered corundum which is completely burned and not added with any additives such as MgO and B2O3. It has a crystal structure of coarse and well-developed α-Al2O3, and the content of Al2O3 is above 99%. Plate-like crystal structure, small pores and closed pores, and the porosity is roughly equivalent to that of fused corundum, high purity, good volume stability, minimal re-sintering shrinkage, and high-temperature treatment of refractory or castables used for production. Has good thermal shock stability and bending strength, but the price is higher than other alumina.

Plate corundum • Instructions for use
The platy corundum can be used as a main component in aluminum carbon, aluminum-magnesium, magnesia-carbon, magnesium-spinus, aluminium-chromium refractory bricks, or as an enriched alumina component. The shaped refractory material can be widely used in steel, casting, ceramics and other industries, and the application in the steel industry covers almost the whole process of ironmaking steelmaking. Application status of refractory materials made from slab corundum in steel industry
Plate-shaped corundum • production process
Plate-shaped corundum is a pure, sintered corundum that is completely burned without adding any additives such as MgO, B2O3, etc.

The performance of slab corundum and its main application areas in refractories
Introduction: For 40 years, slab corundum has been widely used in high-performance refractories for steel, foundry, petrochemical and ceramics. The platy corundum is the leading synthetic high-purity alumina aggregate due to its high refractoriness, excellent thermal shock resistance, creep resistance and wear resistance. Although the overall consumption of refractory materials has fallen sharply, especially in steel manufacturing, the use of slab corundum has not only increased relatively, but has definitely increased. The steady increase in the proportion of continuous casting into the amorphous refractory and the violent trend of high-quality steel are the driving force for the development of slab corundum-based refractories. The purpose of this paper is to describe the typical properties of slab corundum, how it compares with other synthetic high alumina aggregates, and its typical application. The latest developments in the use of platy corundum with spinel and calcium-free binders will also be introduced.

First, performance
The platy corundum is dense, fully contracted, and the sintered α-Al 2 O 3 is composed of 50-400 μm crystal grains. Plate-shaped corundum is named for its grain shape like a board. The plate-shaped corundum was prepared by rapidly calcining the ultrafine α-Al 2 O 3 pellet at a temperature slightly lower than the melting temperature. After heat treatment, the 18-20 mm ball was crushed or milled to obtain platy corundum of various sizes.
For excellent high temperature performance, the low content of silicon oxide, iron oxide and titanium oxide in sorghum corundum is very important. The ultra low content of ferric acid is typically less than 0.002% and is very important for phosphate bonded refractories. Comparing sintered slab corundum and other synthetic high alumina aggregates, such as fused white corundum, the biggest difference was found to have a finer size of impurities. This can cause huge performance differences, especially at high temperatures. The introduction of higher impurity levels in finer sizes greatly reduces high temperature volume stability and creep resistance. Comparing the porosity of fused white corundum and slab corundum, we can see a huge difference. Although the total porosity of the two aggregates is the same, there is a significant difference in grain porosity.
The open porosity of the electrofused grains is 2-3 times that of the sintered grains. Most of the pores of fused alumina are composed of large open pores, and more than half of the pores of slab corundum are closed pores. A high proportion of closed pores is necessary for high thermal shock resistance, which is typical of slab corundum.
The platy corundum exhibits high thermal shock resistance and high strength. Scanning electron micrographs show that the surface of the plate-shaped corundum grains is not as smooth as the surface of the fused corundum grains, and is relatively rough and shallow. This surface structure promotes its reaction with the matrix and mechanical interlocking to increase the strength of the refractory.
The main properties of the plate industry are as follows: 1. High-purity Al2O3 concentration: 99.4%; 2. High crystal hardness; 3. Low open porosity and 2-3 times high closed porosity; 4. High particle bulk density 3.55-3.6g/cm35, high melting point: 2000 °C6, chemically inert; 7, good thermal shock resistance; 8, excellent volume stability; 9, the presence of microcracks; 10, high single grain strength.

Packaging

1. 1 ton bags in container, 25 MT/20'FCL.
2. 25kg bags in container, 25 MT/20'FCL
3. 25kg bags in ton bags, then in container, 25 MT/20'FCL
4. as the customer' request

Packaging of SK37 High Alumina Refractory Brick

1.on wooden pallets with plastic cover: wooden pallet size :930*930 or 1000*1000mm,
2.Load weight of each pallet: 1.5-2.0 tons,

Shipping of SK37 High Alumina Refractory Brick

1.Our packaging is as per customer’s request
2.Normal goods delivered by sea transport
3.Sample shipping by express
4.We will shipping and delivery goods timely, quality and quantity guaranteed, and also in accordance with the contract and customer's requirement completely.

Delivery:

15-30 days working day for large quantity. The shipment we will arrange as soon as possible. Of course, if it is a custom products, the shipping time will delay.
Sample:

Usually by EMS, DHL, UPS, TNT, FedEx. Anyway you like. Bulk order: Usually by sea.

Payment:

It can be through T/T, L/C at sight. The specific terms determined according to the quantity of the goods, etc.
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Export:
Our products have been exported to many countries: Australia, Chile, USA, Russia, UK, Indonesia, etc., good quality have be approved by our clients.

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Sample and trial order are accepted for the quality evaluation

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Henan hongtai kiln refractory co., LTD. Main products are high alumina brick, clay brick, fused zirconium corundum brick, fireproof ball lightweight insulation brick, wear-resistant pouring material, corundum pouring material, low cement high strength pouring material, impermeable material, self-flowing material, plastic material, and various types of refractory materials.For different industries, the cement industry with anti-flaking high-alumina bricks, alkali resistant bricks, phosphate bricks;Boiler industry USES all kinds of brand wear-resisting brick, corundum brick, mullite brick and other finalizing materials.The company insists on "product quality is the life, enterprise integrity is the foundation", in the fierce market competition, won many users' trust and praise.The products are sold all over the country, as far as Vietnam, India, Korea, Pakistan, kazakhstan, other southeast Asian countries and regions.

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