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Position:Jinlin fused alumina>>Refractory>> Bauxite

Bauxite

Author:Jinlin corundumTo update: 2016-09-12

I. Overview:
Jinlin Fused Alumina Refractories Co., Ltd. is a diversified manufacturing plants, research and development, production, sales and service in one. The company mainly produces alumina products, brown fused alumina, white fused alumina, black fused alumina, silicon carbide, chromium fused alumina, bauxite,high alumina ball, garnet, aluminum oxide powder, zircon sand, castable and other professional production and processing company,we have a complete and scientific quality management system.
II. Bauxite description:
Also known as bauxite alumina or bauxite, which is the raw material bauxite brown fused alumina based, but the main component of which is alumina, bauxite, the department of water containing impurities and alumina, a soil like minerals, which after loading the kiln calcination. Bauxite accounted for 2.45-3.15g / cm3, the color is white or off-white, but the iron and brownish yellow or pink.
Bauxite density of 2.4-2.5g / cm3, hardness 1-3. Because bauxite calcination kiln after installation, so it has a high temperature, high melting point characteristics.
III. Bauxite Category:
a, in accordance with the raw material bauxite type classification:
(1) Health and alumina, which alumina raw ore (natural sedimentary rocks).
(2) cooked bauxite, the raw alumina after calcination (1200 ~ 1700 ℃) called cooked alumina.
b, bauxite calcination kiln according to different divided as follows:
① furnace cooked bauxite; ② converter cooked bauxite; ③ down draft kiln bauxite.
C, cooked bauxite is divided into different uses:
① refractory grade bauxite; ② abrasive grade bauxite; ③ welding grade bauxite.

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IV. Bauxite uses:
⑴ Aluminum industry: for defense, aerospace, automotive, electrical, chemical, and other daily necessities.
⑵ Casting: processing bauxite into a fine powder made after the mold casting. Used in military, aerospace, communications, instrumentation, machinery and medical equipment sectors.
(3)For refractory products: high bauxite refractoriness up to 1780 ℃, chemical stability, good physical properties, and therefore is the perfect material to make refractory products.
(4)Magnesia and bauxite as raw material, adding an appropriate binder for casting ladle whole bucket liner effect is remarkable.
(5)The manufacture of cement, abrasive materials, ceramic industry as well as various compounds chemical industry can be made of aluminum bauxite.
V.The physical and chemical properties of calcined bauxite Change:
1.The appearance of the original gray, dark gray and other colors into white, beige, etc., but the color will deepen with increasing aluminum content. The original earthy luster becomes fused alumina oil sheen or gloss, sometimes a slight melting of the surface of stone or cracks;
2.Increasing the alumina content of 11 to 13%, the amount of other impurities increase slightly;
3.The volume is reduced about 23%;
4.Loss on ignition of about 14.5%;
5.The hardness increased from 1 to 3 to 8 above;
6.To the bulk density was increased from 2.8 ~ 3g / cm3 above about 2.5g / cm3;
7.Crystalline water, or structural water, all the water overflow attached;
8.The structure consists of sparse, loose, soft becomes dense and hard;
9.To reduce water absorption; slag resistance, alkali resistance enhancement;
10.The intensity increases;
11.Permeability reduction;
12.The gasification rate reduction;
13.Tolatile constituents, flammable components, soil odor completely disappeared;
14.Refractoriness reach above 1780 ℃.
VI.Bauxite physical and chemical indicators:

Grade Chemical Composition Refractoriness  Bulk Density
AL203 CaO Fe203
Special Grade >85 <0.6 <1.4.0 >1790℃ >3.6g/cm3
A >80 <0.6 <3.0 >1790℃ >3.0g/cm3
A two 70-80 <0.8 <3.0 >1790℃ >2.8g/cm3
Grade B 60-70 <0.8 <3.0 >1770℃ >2.65g/cm3
Three 50-60 <0.8 <2.5 >1770℃ >2.55g/cm3

VII. Conclusion:
Shizui Mountain City Jinlin Fused Alumina Refractories Co., Ltd. Since its inception, always adhere to the “quality first, the customer first, integrity management, harmonious development” purposes, to develop a one-stop products pre-sale, sale and provide customers with various stages of service Promise of. Customer-focused, technology-led, quality and development, with workers as the first, first-class brand, build first-class enterprise concept of enterprise development, scientific development concept to guide the overall company, strengthen production management, improve the detection means to improve product quality and good after-sales service.

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