What is the genesis of bauxite and what are the main components of bauxite?

According to the opinion of Liao Shifan and others, Chinese bauxite.

Deposits can be divided into paleoweatherized crust bauxite deposits and laterite.

type bauxite deposits.

The formation of paleoweatherized crustal bauxite deposits in China has gone through three stages. The first stage is terrestrial.

The stage is caused by weathering under atmospheric conditions.

Formed containing bauxite minerals, clay minerals, iron oxide.

Residues and slopes of minerals and other aluminum-rich weathered crust materials, such as calcareous laterite layer, laterite layer or laterite bauxite, this stage is the stage of in-situ residue, accumulation or off-site accumulation under atmospheric conditions; The second stage is the stage of submerging seawater (or lake water) for the aluminum-calcium laterite layer, laterite layer or laterite bauxite, some are immediately submerged by seawater (or lake water), and some are submerged by seawater (or lake water) after a certain period of lithification, and gradually buried deep underground, and form the original bauxite layer after a period of diagenetic metabiogenesis evolution and transformation; The third stage is the supergene enrichment stage, which is the original bauxite layer lifted to the shallow part of the surface with the crust due to the transformation of surface water or groundwater, so that the siliceous leaching and aluminous enrichment are formed, and the bauxite deposit with industrial value is formed. Ancient weathered crustal bauxite in China was mainly formed in the Carboniferous.

The formation of bauxite deposits of this type is related to the paleoweathering crust of the erosion discontinuity. Generally speaking, the erosion intermittent period is long, especially if the underlying bedrock is carbonate rock or mafic ejecta rock (such as basalt) that contains more aluminium and is more easily weathered, and the deposits formed are often rich in ore grade, thick ore layer, and large ore body.

As for lateritic bauxite deposits, they are generally considered to have been formed by weathering of aluminum-bearing rocks under modern climatic conditions. There is only one subclass of lateritic bauxite deposits, called Zhangpu.

Lateritic bauxite deposits are bauxite deposits formed by the weathering of basalts from the Tertiary to the Quaternary through modern (Quaternary), and their reserves are very small, accounting for only the total bauxite reserves in China. Modern lateritic bauxite in China is mainly formed in low-latitude areas, such as Fujian, Hainan and some areas of Guangdong. These areas are characterized by hot weather, abundant rainfall, and easily weathered basalt, which can lead to the formation of modern laterite-type bauxite.

As for China's Spratly Islands.

Although the Zhongsha Islands are also at low latitudes and have a bauxite-forming climate, these islands have not been raised to land for a long time, only 130,000 years, and have undergone a short period of weathering, so it is difficult to form bauxite deposits.

According to the geological characteristics of bauxite deposits in China, the occurrence of sedimentary bauxite deposits is generally gentle, and exploration trenches and shallow wells are used to delineate the surface boundary of the ore body, and drilling is used in the deep part. However, when the ore body is steep and the terrain conditions are favorable, it can also be appropriately combined with a small amount of exploration to explore advanced reserves and verify the reliability of borehole data. For the accumulation type and laterite bauxite deposits, because they are not deeply buried, except for the outside of the delineated ore body, the exploration groove can be used to cooperate with shallow wells, and all other sections are explored with shallow wells.

Sedimentary bauxite deposits are divided into four types of exploration

1) Exploration type: Layered sedimentary bauxite deposits with large extension scale, simple form, stable thickness, unstable, simple internal structure, relatively simple, and simple structure. Such as Shanxi Ke Russian bauxite deposits.

2) Exploration type: medium-large ore body extension scale, simple morphology, stable thickness-unstable, simple internal structure-relatively simple, simple structure-simple layered, lenticular sedimentary bauxite deposit. Such as Henan Jiagou, Guizhou Weijiazhai, Shandong Wangcun and other bauxite deposits.

3) Exploration type: Medium-small scale of ore body extension, irregular shape, unstable thickness-very unstable, simple - complex internal structure, simple - complex structure - complex lenticular sedimentary bauxite deposit. Such as Guizhou Laohuangpo, Yanyuan A ore section No. 1 ore body and other bauxite deposits.

4) Exploration type: small lenticular and funnel-shaped sedimentary bauxite deposits with very small extension scale, irregular shape, extremely unstable thickness, and complex internal structure. Such as the No. 2 ore body of Henan Zhangyao Yuan.

The main components of bauxite are gibbsite and gibbsite.

Bauxite is actually a general term for the ore that can be used in industry and is composed of gibbsite and diaspore as the main minerals. Bauxite is the best raw material for the production of aluminium metal, and it is also the most important application field, accounting for more than 90% of the world's total bauxite production.

Uses:

1) Aluminium smelting industry. It is used in national defense, aviation, automobiles, electrical appliances, chemicals, daily necessities, etc.

2) Precision casting. Bauxite clinker is processed into fine powder and made into casting molds and then precision casting. It is used in military, aerospace, communications, instrumentation, machinery and medical equipment departments.

3) Used in refractory products. The refractory degree of high alumina clinker is as high as 1780, with strong chemical stability and good physical properties.

The above content refers to Encyclopedia-Bauxite.

Bauxite, also known as bauxite or bauxite, is mainly composed of alumina, which is hydrated alumina containing impurities, and is a kind of earth-like mineral.

White or grayish-white with iron in color. Density, hardness 1 3, opaque, brittle. Extremely difficult to melt. Insoluble in water, soluble in sulfuric acid, sodium hydroxide solution. It is mainly used for smelting aluminum and making refractory materials.

To gibbsite, ohmg, 2, is to refine aluminum, what does it mean to be bauxite ****:75** is 380 yuan ton.

Mainly alumina-containing water, per square meter of quiet potato age = in alumina. **It is 1600-1700 RMB, cooked ore: 1600-1700 square meters.

3;al。

The main components of bauxite are gibbsite and diaspore, which often contain impurities such as cao, mgo, siO2, etc. Bauxite is the best raw material for the high production of aluminum, and it is also the most important application field, accounting for more than 90% of the world's total bauxite production.

Bauxite is the best raw material for the production of aluminum, and it is also the most important application field, accounting for more than 90% of the world's total bauxite production. Although the proportion of bauxite in non-metallic aspects is small, it has a wide range of uses. Mohs hardness.

Bauxite actually refers to the general term of ore that can be used in industry and is composed of gibbsite, diaspore monohydrate or diaspore monohydrate as the main minerals. Diaspore monohydrate, also known as diaspore, has the structural formula and molecular formula of alo(OH) and Al2O3·H2O, respectively. Orthorhombic crystal system, the crystalline is columnar, plate-shaped, scaly, needle-shaped, prismatic, etc.

The diaspore in the ore generally contains TiO2, SiO2, Fe2O3, Ga2O3, Nb2O5, Ta2O5, Tr2O3 and other homogeneous infusions of different quantities. Diaspore is soluble in acids and alkalis, but it is very weakly dissolved at room temperature and pressure, and can be completely decomposed under high temperature and high pressure and strong acid or alkali concentration. Diaspore monohydrate is formed in acidic medium and is symbiotic with diasporite, hematite, goethite, kaolinite, chlorite, pyrite, etc.

Its hydration can be turned into diasporite, and dehydration can be turned into corundum, which can be metamorphosed by kaolinite, pyrite, siderite, chlorite, etc. Jabbore monohydrate, also known as boehmite, diaspore, structural formula is ALO(OH), molecular formula is Al2O3·H2O. Orthorhombic crystal system, the crystallized ones are rhomboid, prismatic, prismatic, needle-like, fibrous and hexagonal plate-like.

The bspore monohydrate in the ore often contains Fe2O3, TiO2, Cr2O, Ga2O3 and other homogeneous images. Jabbore monohydrate is soluble in acids and alkalis. The mineral is formed in acidic media and is mainly produced in sedimentary bauxite, which is characterized by symbiosis with siderite.

It can be metasomatized by diaspore monohydrate, gibbsite, kaolinite, etc., and can be transformed into diaspore monohydrate and corundum by dehydration, and can be turned into diaspore by hydration. Diaspore is also known as diaspore and diaspore, with the structural formula Al(OH) and the molecular formula Al2O3·3H2O. Monoclinic crystal system, the crystallized ones are hexagonal plate-shaped, prismatic-shaped, often fine-crystalline aggregates or double crystals, and the gibbsite in the ore is mostly irregular aggregates, all of which contain different amounts of TiO2, SiO2, Fe2O3, Nb2O5, Ta2O5, Ga2O3 and other homogeneous or mechanical mixtures.

Gibbsite is soluble in acid and alkali, and its powder can be completely dissolved after heating to 100 hours for 2 hours. The mineral is formed in acidic media, and in weathered crust deposits, gibbsite is the primary mineral and the main ore mineral, symbiotic with kaolinite, goethite, hematite, illite, etc. Diaspore dehydration can be turned into diaspore monohydrate, diaspore monohydrate and corundum, which can be metabolized by kaolinite, hydro kaolinite, etc.

The chemical composition of bauxite is mainly Al2O3, SiO2, Fe2O3, TiO2, H2O, the total amount of the five accounts for more than 95% of the composition, generally 98%, the secondary components are S, CaO, MGO, K2O, Na2O, CO2, Mno2, organic matter, carbonaceous, etc., and the trace components are Ga, Ge, NB, Ta, TR, Co, Zr, V, P, CR, Ni, etc. Al2O3 is mainly found in aluminum minerals - diaspore, diaspore monohydrate and gibbsite, followed by silicon minerals (mainly kaolinite minerals).

Gibbsite Al(OH)3 gibbsite is a hydroxide crystal hydrate of aluminum, which is the main component of bauxite in bauxite. The crystals of gibbsite are extremely small, and the crystals are clustered together into nodules, beans or earth, generally white, with a vitreous luster, and red if they contain impurities. They are mainly secondary minerals produced after weathering of aluminum-containing minerals such as feldspar.

The chemical composition of Al(OH)3 crystals is hydroxide minerals belonging to the P21 N space group of the monoclinic system. It is homogeneous and polymorphic with bayerite and nordstrandite. It was formerly known as bauxite or diaspore.

Theoretical composition of bauxite (crystal chemistry) (wb%): common homogeneous substitutions include Fe and Ga, Fe2O3 can reach 2%, and Ga2O3 can reach. In addition, it often contains impurities such as CAO, MGO, SIO2, etc.

The main component of bauxite: Al2O3

In addition: SiO2, Fe2O3, etc.

Do you have bauxite products there?

Bauxite (the main component is Al2O3, containing SiO2, Fe2O3, MGO and other impurities).

Bauxite refers to the general term for ores that can be used industrially and are composed of gibbsite, diaspore monohydrate or diaspore monohydrate as the main minerals. The main component of bauxite is aluminum oxide (Al2O3), which is often produced in the form of lumps, nodules, oolitic or beans. Its color varies from white to light yellow or red, reddish brown, and generally the streaks are white, dull or earthy, and opaque.

Bauxite is the most important ore for smelting aluminum, and its use accounts for more than 90% of the world's total bauxite production. After bauxite processing, it is also widely used in the manufacture of high-alumina cement, refractories, abrasives, ceramics, chemicals, pharmaceuticals and other industrial fields. The use of aluminum metal involves national defense, aerospace, electricity, communications, and people's daily life utensils such as pots and pans.