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Henan Hongtai Kiln Refractory Co., Ltd.
Henan Hongtai Kiln Refractory Co., Ltd.
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Refractory raw material 99.2% Al2O3 white tabular alumina for refractory

Henan Hongtai Kiln Refractory Co., Ltd.

Country/Region:china

Contact Person:MsZhang View Contact Details

Refractory raw material 99.2% Al2O3 white tabular alumina for refractory

Brand Name : HT
Model Number : follow
Certification : ISO9001
Place of Origin : Henan ,China
MOQ : 1 ton
Price : US $400-700 / Tons
Payment Terms : L/C, D/A, D/P, T/T, Western Union, MoneyGram
Supply Ability : 2000 Ton/Tons per Month
Delivery Time : 15 days
Packaging Details : Tabular alumina is packaging with plastic bags, with water-proof cover , and tightened with plastic bandages. 25kg/bag,50kg/bag,in 1 ton bag,or as customers' require
Material : Alumina Cement
Al2O3 Content (%) : ≥99
Refractoriness (Degree) : Common (1580°< Refractorines<1770°
Color : White
AP : 3-5
Size : Customers' Requirement
Bulk Density(g/m ) : ≥3
Apparent porosity% : ≥3
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Product Description
Introduction of Tabular alumina
The Tabular alumina 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.
Tabular alumina . Instructions for use
The Tabular alumina 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 Tabular alumina in steel industry
Tabular alumina . production process
Tabular alumina is a pure, sintered corundum that is completely burned without adding any additives such as MgO, B2O3, etc.
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Technology
Physical and chemical indicators
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The performance of tabular alumina and its main application areas in refractories
Introduction: For 40 years, tabular alumina has been widely used in high-performance refractories for steel, foundry, petrochemical and ceramics. The Tabular alumina 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 tabular aluminahas 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 oftabular alumina -based refractories. The purpose of this paper is to describe the typical properties of tabular alumina , how it compares with other synthetic high alumina aggregates, and its typical application. The latest developments in the use of Tabular alumina with spinel and calcium-free binders will also be introduced.
First, performance
The Tabular alumina 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 Tabular alumina 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 tabular aluminaand 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 andtabular alumina , 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 tabular aluminaare closed pores. A high proportion of closed pores is necessary for high thermal shock resistance, which is typical oftabular alumina .
The Tabular alumina exhibits high thermal shock resistance and high strength. Scanning electron micrographs show that the surface of the tabular alumina 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/cm3

5, high melting point: 2000 °C

6, chemically inert;

7, good thermal shock resistance;

8, excellent volume stability;

9, the presence of microcracks;

10, high single grain strength.
Second, the main application areas oftabular alumina
The properties of tabular aluminahave many applications in the field of refractory materials. The main application area of tabular aluminais tabular alumina suitable for ceramic, chemical and water-binding substrates. The Tabular alumina can be used alone or in combination with the calcined and/or activated alumina. Because Tabular alumina exhibits extremely high purity even in fine powder, it can be used to improve the performance of lower alumina aggregates. For example, bauxite and fused brown corundum use coarse particles of these aggregates and medium particles and fine powder of tabular alumina . It has been mentioned earlier that the increase in the consumption of tabular aluminais mainly due to the continuous casting of steel. In particular, the use of tabular aluminafor skateboards, dip tubes and nozzles is an industry standard.
Third, the new development of tabular alumina/ spinel
Japan has found that the addition of 20-30% of aluminum-rich spinel to cement-bonded tabular aluminarefractories can significantly improve slag corrosion resistance. Because the concept of aluminum-rich spinel is very common around the world, it has caused more new applications oftabular alumina . In particular, the amorphous lining of the ladle promotes the use of tabular aluminain the future. The spinel can increase the thermal flexural strength of the cement-bonded cement tabular aluminacastable at 1500 ° C to 22 N/mm 2 . It is important to note that even 15% cement does not degrade high temperature performance. Considering that the high-temperature flexural strength of castables with lower cement content is reduced by an order of magnitude, it cannot be seen that these findings will have a significant impact on future refractory technology. It is possible to use some castables which have a higher cement content and higher thermal performance than ultra low cement castables and have no known repeatability limitations of ULCC. Interestingly, the addition of 2% silicon micropowder to the spinel tabular aluminacastable can reduce the thermal flexural strength at 1500 °C to below 1 N/mm2.
Fourth,tabular alumina
Because of the limitations of cement-bonded alumina systems in silica-rich slag environments, Alphabond systems with pure alumina-based binders were developed. The main chemical component is that alumina contains impurities CaO; 0.1%, SiO2; 0.2%. Na2O; 0.5% and water ≤ 9%. It can be treated like ordinary calcium aluminate cement. This system can be used alone or in combination with silicon micropowder.
Conclusion: The new water-binding system enables the refractory industry to use alumina castables where cement-bonded systems do not exhibit optimal performance. It once again proves that tabular aluminacan be flexibly applied to many different fields.


Produce Process

production process


1)Raw material to factory→checkout→burdening→stirring→mixing→taking out the raw material,
2)Crushing→Mixing→Shaping→Drying→Firing→Inspection→Packaging and Shipment.
2.Quality Assurance
1)Going out the furnace→checkout→packing→qualified product→putting in storage→sale,
2)The process from raw to product are strictly tested by equipment.
1.Inspection and Control of incoming raw materials: according to the chemical content,raw materials are classified into different levels to ensure quality of brick first.
2.Inspection and control of the process: during the production,every brick will be weighed twice strictly to reduce the error of weight .
3.Quality audit by quality management: inspection of product standardization of quality of each product by process control and experimentation, taking corrective measures timely whenever deviations are noted.
4.Before delivery, the inspectors will inspect the size,appearance, physical and chemical properties of brick again in factory.

refractory brick


Why choose Us

Henan hongtai kiln refractory co., LTD. Is well aware that there are thousands of demands from customers, which can be summarized in four aspects: reliable quality, timely delivery, reasonable price and considerate service.The company will continue to adhere to the corporate spirit of "contributing to society and serving customers" and the business philosophy of "mutual benefit, win-win, integrity, efficiency, preciseness and responsibility".Our company is willing to develop a wide range of technical exchanges with colleges and universities and colleagues from all walks of life at home and abroad in a flexible and diversified way.

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, Iran and other southeast Asian countries and regions.

Henan hongtai kiln refractory co., LTD. : "quality first, reputation first, customer first: it is our aim."Scientific management, strong technical force, perfect testing means, advanced technological equipment and stable product quality are the guarantee of quality service.Henan hongtai kiln refractories co., LTD sincerely hopes to cooperate with you hand in hand and in good faith.


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