BAUXITE
BAUXITE
CAS: 1318-16-7
Molecular Formula: Al2H2O4
BAUXITE - Names and Identifiers
BAUXITE - Physico-chemical Properties
| Molecular Formula | Al2H2O4 |
| Molar Mass | 119.98 |
| Density | 2.275 |
| Appearance | Dust (red, brown, or yellow) |
| Color | Buff to orange solid |
| Odor | odorless |
| Stability | Stable. |
BAUXITE - Risk and Safety
| Toxicity | TCLo ihl-hmn: 22 mg/m3/5Y GTPZAB 4,28,60 |
BAUXITE - Nature
Open Data Verified Data
- bauxite refers to the industrial use of value, with gibbsite, boehmite or a boehmite as the main mineral composition of the ore collectively. The chemical composition of bauxite is mainly A1203, Si02, Fe2 03, Ti02, H2 0, accounting for more than 95% of the total composition, generally> 98%, the secondary components are S, Ca0, Mg0, k2 0, Na20, CO2, Mn02, organic matter, carbon, etc., trace components are Ga, Ge, Nb, Ta, Tr, Co, Zr, V, P, Cr, Ni, etc.
- meehmite (boehmite). The structural and chemical formulae are A10(OH) and A1203.H20, respectively. Orthorhombic crystal system, columnar, plate-like, scale-like, needle-like, rhomboid and so on. Boehmite in the ore generally contains different amounts of mixed substances such as Ti02, Si02, Fe2 03, Ga2 03, Nb2 OS, Ta2 OS and Tr2 03. Boehmite is soluble in acid and alkali, but it dissolves very weakly at normal temperature and pressure, and can be completely decomposed under high temperature and high pressure and strong acid or alkali concentration. It is formed in an acidic medium and symbiotic with boehmite, hematite, goethite, kaolinite, chlorite and pyrite. The hydration of a-hydrate can be changed into a-alumina, and the dehydration can be changed into a-corundum.
- boehmite and boehmite. The structural and chemical formulae are AlO (OH) and A1203.H20, respectively. Orthorhombic, rhomboid, rhomboid, rhomboid, needle-like, fibrous and hexagonal plate-like. In the ore, there are usually Fe203, T102, Crz 0, Ga2 03 and other similar substances. Boehmite monohydrate is soluble in acid and alkali. It is mainly produced in sedimentary bauxite, and often associated with siderite. Dehydration can be converted into a-alumina and a-corundum, and hydration can be converted into gibbsite.
- gibbsite (boehmite, hydroxyethyenite). Structural formula AI(OH), chemical formula is A12 03.3H20. Monoclinic system, with hexagonal plate-like and prism-like crystals intact, often exhibiting fine-grained aggregates or bicrystals, and the ore of gibbsite is mostly irregular aggregates, all containing different amounts of Fe2 03, ti02, Cr20, Ga2 03. Si02, Nb2 OS, Ta2 OS and other species are the same as the image or mechanical mixture. Gibbsite soluble in acid and alkali, heated to 100 ° C can be completely dissolved. In the weathering crust deposit, gibbsite is the primary mineral and the main ore mineral, which is symbiotic with kaolinite, goethite, hematite and illite. The dehydration of gibbsite can be changed into boehmite, duehmite and mouth corundum.
Last Update：2025-06-10 22:55:16
BAUXITE - Preparation Method
Open Data Verified Data
bauxite beneficiation is relatively simple, generally using hand-separation, but with the development of China's refractory materials and aluminum-oxygen industry, the production of bauxite raw materials put forward higher and higher requirements. Bauxite as raw materials for aluminum smelting, different smelting methods have different quality requirements. The primary task of bauxite selection is to increase the ratio of aluminum to silicon. Foreign bauxite is three hydrate type, China is dominated by a water type. Bauxite to aluminum ingot to go through several processes, the first to extract alumina from bauxite, generally using sintering method (sintering Law 3. 5~5.0) or Bayer method (Bayer method aluminum silicon ratio is greater than 8~10), and then from the aluminum oxide in the extraction of electrolytic aluminum, and finally is the aluminum ingot. China's alumina production uses the combined method, that is, the mixed method, it is based on the Bayer process to deal with most of the soluble of a water, hard or insoluble part of the sintering method, and in the sintering process to recombine with part of bauxite to improve the grade
Last Update：2025-06-10 22:55:16
BAUXITE - Application
Open Data Verified Data
bauxite has various uses, the most important of which is the extraction of metal aluminum in the aluminum industry, which accounts for more than 90% of the world's total output of bauxite. Bauxite is widely used as a raw material for refractories, grinding materials, chemicals and high alumina cement. Its products can be used in papermaking, purification of water, ceramics and petroleum refining; Activated alumina in the chemical, oil refining, pharmaceutical industry can be used as catalyst, Catalyst Carrier and decolorization, dehydration, degassing, Deacidification, drying and other physical adsorbent; Is the main raw material of advanced grinding wheel, polishing powder.
Last Update：2025-08-19 16:24:40
BAUXITE - Reference Information
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| use | (1) aluminum smelting industry. Used in national defense, aviation, automobiles, electrical appliances, chemicals, daily necessities, etc. (2) Precision casting. The bauxite clinker is processed into fine powder to make a mold and then cast. Used in military industry, aerospace, communications, instrumentation, machinery and medical equipment departments. (3) used in refractory products. The refractoriness of high bauxite clinker is as high as 1780 ℃, with strong chemical stability and good physical properties. (4) aluminum silicate refractory fiber. It has the advantages of light weight, high temperature resistance, good thermal stability, low thermal conductivity, small heat capacity and mechanical vibration resistance. Used in steel, non-ferrous metallurgy, electronics, petroleum, chemical, aerospace, atomic energy, national defense and other industries. It is to put high aluminum clinker into a high-temperature electric arc furnace with a melting temperature of about 2000~2200 ℃, and after high-temperature melting, high-pressure high-speed air or steam injection and cooling, it becomes white "cotton"-aluminum silicate refractory fiber. It can be pressed into fiber blankets, boards or woven into cloth to replace refractory bricks lining industrial high-temperature kilns such as smelting, chemical industry, and glass. Firefighters can make clothes with fire-resistant fiber cloth. (5) magnesia and bauxite clinker are used as raw materials, and appropriate binder is added to pour the integral barrel lining of the steel barrel with good effect. (6) manufacturing alumina cement, grinding materials, ceramic industry and chemical industry can make various compounds of aluminum. |
| category | toxic substances |
| toxicity classification | highly toxic |
| flammability hazard characteristics | non-combustible; People breathing their dust can lead to pneumoconiosis, fibrosis and lesions |
| storage and transportation characteristics | ventilation and low temperature drying |
| occupational standard | STEL 0.5 mg/m3 |
Last Update：2024-04-09 21:32:01
