What are the types of aluminum ore in China? Where are they located? What are the types? And the geo

Aluminium is one of the most widely distributed elements in the earth's crust and is a lithophilic and oxygen-loving element. Aluminum is mostly oxides, hydroxides and oxygen-containing aluminosilicates exist in nature, and the natural metal of aluminum is rarely found. At present, most of the known domestic and foreign industrial bauxites are formed under supergenetic conditions.

There are two main forms of bauxite formation under supergenetic conditions: weathering-residual (residual) mineralization (lateritic mineralization) and weathering-transport-sedimentary mineralization or weathering-transformation-redeposition mineralization (sedimentary mineralization). Weathering-residual (residual) mineralization is the favorable terrain (such as residual hills, low mountains and terraces) with good excretion of aluminum-bearing parent rocks under hot and humid climate conditions, due to the weathering and decomposition of water, CO2 and organisms, the soluble substances K, NA, CA, MG and SiO2 in the parent rock are leached and discharged, and the remaining substances with little activity Al, Fe and Ti form lateritic bauxite in situ.

Weathering-transport-sedimentary mineralization is the formation of bauxite in aluminum-bearing rocks, laterite weathered crusts or formed laterite deposits, under the action of gravity, water and natural acids (sulfuric acid, carbonic acid, organic acids), etc., through mechanical or chemical weathering, denudation, transportation and other physical and chemical transformations, and the formation of sedimentary bauxite in the aqueous medium environment. China's bauxite is mainly distributed in Pingguo and Deqing, Guangxi.

The types of bauxite are as follows:

1. Sedimentary bauxite deposits.

Most of these deposits are produced on carbonate erosion surfaces, and a few are produced on sandstone, shale, basalt erosion surfaces or their compositions.

1) Diasore monohydrate bauxite deposits produced on the erosion surface of carbonate rocks.

2) Diaspore monohydrate bauxite deposits occurring on sandstone, shale, marl, basalt erosion surfaces or in a rock series composed of these rocks.

2. Stacked bauxite deposits.

This type of deposit is formed by the weathering and leaching of primary sedimentary bauxite under suitable tectonic conditions, and the in-situ residue or re-accumulation in karst depression (or slope).

3. Lateritic bauxite deposits.

The lateritic bauxite deposits in China (i.e., weathered remnant type or basalt weathered crust type) are produced in basalt weathering crust and are leached by basalt weathering.

Bauxite is classified according to its genesis as:

1) Xiuwen-style carbonate paleoweathering crust off-site accumulation subtype bauxite deposits, also known as carbonate paleoweathering crust off-site accumulation subtype bauxite deposits.

2) In-situ accumulation of subtype bauxite deposits in the Xin'an-style carbonate paleoweathering crust.

3) Pingguo-style carbonate paleoweathered crust in-situ accumulation-modern karst accumulation subtype bauxite deposits.

4) Zunyi-style aluminosilicate paleoweathering crust in-situ accumulation of subtype bauxite deposits.

Guizhou bauxite.

Exploration began in 1957 in the Xiuwen Xiaoshanba bauxite mining area, with a total of 10,000 tons of bauxite and an average ore grade. In 1979, the Wulongsi mine area began to put into production, and the ore layer was layered, with a gentle occurrence, an inclination angle of 5° 10°, and a north-east slope.

Shanxi bauxite deposits were first explored in 1960, and then explored Bujiayu and other ore sections, with a total of 10,000 tons of bauxite and an average ore grade. In 1986, Shanxi Aluminum Plant began to mine Xiaoyi bauxite. There are three types of ores: dense, coarse, and bean-like.

Henan bauxite deposit, which was explored as refractory clay ore in 1961 and 1964, began production in 1966. A total of 10,000 tons of bauxite have been proven. The geological age of the ore-bearing layer is the same as that of the Xiaoyi Ke'er deposit in Shanxi, and it belongs to the Late Carboniferous Benxi period.

The Pingguo bauxite deposit covers an area of 1,750 km2 and has accumulated ore in a 132 km long range of layered ore bodies. Exploration of primary ore was carried out as early as 1959 and 1961. Due to the high sulfur content of the primary ore and the unutilization, in 1974, the accumulation ore was transferred to exploration, and the cumulative proven bauxite reserves reached 10,000 tons before and after, with an average grade.

Because the sulfur content of layered ore is too high, it is still difficult for industry to utilize.

Zunyi bauxite depositThe mine was explored in 1989 with proven reserves of 11.12 million tons and an average ore grade. The shape of the ore layer is complex, there are many ore-free skylights, and the ore bearing coefficient is small, about about about one. These rock layers are eroded into bauxite, clay minerals and other weathered crust materials in situ, and a small part of them are formed by the slight migration and accumulation of nearby weathered crust bauxite minerals and clay minerals due to the action of slope accumulation.

<>1. The world's bauxite resources are relatively rich, and the data of the United States Geological Survey in 2015 show that the world's bauxite resources are 550-75 billion tons. The world's proven reserves of bauxite are about 28 billion, mainly in Africa (32%), Oceania (23%), South America and the Caribbean (21%), Asia (18%) and other regions (6%).

2. From the perspective of national distribution, bauxite is mainly distributed in Guinea, Australia, Brazil, China, Greece, Guyana, India, Indonesia, Jamaica, Kazakhstan, Russia, Suriname, Venezuela, Vietnam and other countries. Among them, Guinea (7.4 billion tons of proven bauxite reserves), Australia (6.5 billion tons of proven bauxite reserves) and Brazil (2.6 billion tons of proven bauxite reserves) account for about 60% of the world's total proven bauxite reserves.

The geographical distribution of bauxite is as follows:

Bauxite actually refers to the general term of 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 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. Bauxite accounts for a small proportion of non-metallic uses, but it is very versatile. Mohs hardness.

Bauxite is an ore with aluminum minerals as the main component, which is divided into the following ore types:

a) A-water bauxite: It is mainly composed of diaspore monohydrate (diasporsite) and diaspore monohydrate (diaspore). Aqueous bauxite can be divided into three types: diasporite bauxite, diasporite-diasporite bauxite and diasporite bauxite.

b) Tri-hydrate bauxite: mainly composed of gibbsite;

c) Mixed bauxite: composed of a mixture of diaspore monohydrate, diasporite monohydrate and gibbsite. Such as gibbsite - bauxite monohydrate, bauxite monohydrate - gibbsite bauxite and relatively rare diasporine monohydrate-diaspore - gibbsite bauxite, etc.

It is known that bauxite monohydrate bauxite is the main lease in China, and there are also a small amount of tri-water bauxite and mixed bauxite.

When it comes to the elements in it, it can be divided into useful elements and others. The most important useful element is definitely AL, sometimes accompanied by FE, TI, etc.; Other elements mainly include SI, O, CA, MG, NA, etc.

China's bauxite resources are still relatively abundant, and the four metallogenic areas of North China Platform, Yangtze Platform, South China Fold System and Southeast Coastal Area all have good bauxite metallogenic conditions, especially the three metallogenic belts of Jinzhong-Jinbei, Henan-Jinnan, and Guizhou-Guizhou-Central have good metallogenic conditions and large resource prospects. Metallogenic belts such as western Guangxi-eastern Yunnan and southern Sichuan-northern Guizhou also have certain prospects. According to the analysis of existing geological conditions and metallogenic conditions, the total amount of bauxite resources in China is expected to reach 5 billion tons.

The distribution of bauxite in China is highly concentrated, and the reserves of Shanxi, Guizhou, Henan and Guangxi provinces (regions) account for the total reserves of Shanxi, Guizhou, Henan and Guangxi, and the reserves of the remaining 15 provinces, autonomous regions and municipalities directly under the central government only account for the total reserves of the country.

Henan's bauxite is concentrated in more than 10 counties south of the Yellow River and west of the Beijing-Guangzhou line, including Gongxian, Dengfeng, Yanshi, Xin'an, Sanmenxia, Shaanxi, Baofeng, Lushan, Linru and Yuxian, with an area of more than 30,000 km2, and the proven bauxite reserves rank second in the country, with a total resource of up to 1 billion tons.

Shanxi's bauxite deposits (points) are mainly distributed in Xiaoyi, Jiaokou, Fenyang, Yangquan, Yuxian, Ningwu, Yuanping, Xingxian, Baode, Pinglu and other 5 large areas of 42 counties, covering an area of about 10,000 km2, proven bauxite reserves, ranking first in the country, the total resources of the area are estimated to reach 2 billion tons.