BusinessIndustry

Aluminum ore: deposits, mining

In modern industry, aluminum ore is the most demanded raw material. The rapid development of science and technology has made it possible to expand the scope of its application. What is aluminum ore and where it is mined is described in this article.

The industrial value of aluminum

Aluminum is considered the most common metal. According to the number of deposits in the earth's crust, it occupies the third place. Aluminum is also known to everyone as an element in the periodic table, which refers to light metals.

Aluminum ore is a natural raw material from which this metal is produced. Basically, it is extracted from bauxites, which contain aluminum oxides (alumina) in the largest amount - from 28 to 80%. Other rocks - alunite, nepheline and nepheline-apatite are also used as raw materials for aluminum production, but they are of poor quality and contain much less alumina.

In non-ferrous metallurgy, aluminum ranks first. The fact is that due to its characteristics it is used in many industries. So, this metal is used in transport engineering, packaging production, construction, for manufacturing various consumer goods. Also, aluminum is widely used in electrical engineering.

To understand the importance of aluminum for humanity, it is enough to look at the everyday things that we use everyday. Very many household items are made of aluminum: parts for electrical appliances (refrigerator, washing machine, etc.), dishes, sports equipment, souvenirs, interior items. Aluminum is often used for the production of various types of packaging and packaging. For example, cans or disposable foil containers.

Types of aluminum ores

Aluminum is contained in more than 250 minerals. Among them, the most valuable for industry are bauxite, nepheline and alunite. Let us dwell on them in more detail.

Bauxite ore

In nature, aluminum is not found in pure form. Basically it comes from aluminum ore - bauxite. It is a mineral, which for the most part consists of aluminum hydroxides, as well as iron oxides and silicon. Due to the high content of alumina (from 40 to 60%), bauxites are used as raw materials for the production of aluminum.

Physical properties of aluminum ore:

  • Opaque mineral of red and gray in different shades;
  • Hardness of the strongest samples is 6 on the mineralogical scale;
  • The density of bauxite, depending on the chemical composition, varies between 2900-3500 kg / m³.

Deposits of bauxite ore are concentrated in the equatorial and tropical belt of the earth. More ancient deposits are located on the territory of Russia.

How is bauxite aluminum ore formed

Bauxite is formed from a single-water alumina hydrate, boehmite and diaspora, a three-hydrate hydrargillite hydrate and accompanying minerals of hydroxide and iron oxide.

Depending on the composition of nature-forming elements, three groups of bauxite ores are distinguished:

  1. Monohydrate bauxites - contain alumina in a single-water form.
  2. Trihydrate - such minerals are composed of alumina in a three-water form.
  3. Mixed - this group includes a combination of previous aluminum ores.

Deposits of raw materials are formed due to the weathering of acidic, alkaline, and sometimes basic rocks or as a result of the gradual precipitation of a large amount of alumina on the sea and lake bottom.

Alunite ores

This type of deposit contains up to 40% of aluminum oxide. Alunite ore is formed in the water basin and coastal zones in conditions of intense hydrothermal and volcanic activity. An example of such deposits is Lake Zaglinskoye in the Lesser Caucasus.

The rock is porous. Mainly consists of kaolinites and hydromica. Industrial interest is an ore with an alunite content of more than 50%.

Nepheline

This is an aluminum ore of magmatic origin. It is a full-crystalline alkaline rock. Depending on the composition and technological characteristics of processing, several types of nepheline ore are distinguished:

  • The first grade is 60-90% nepheline; It contains more than 25% of alumina; Processing is carried out by the sintering method;
  • Second grade - 40-60% nepheline, the amount of alumina is slightly lower - 22-25%; During processing, enrichment is required;
  • Third grade - nepheline minerals, which do not represent any industrial value.

World production of aluminum ores

For the first time, aluminum ore was mined in the first half of the 19th century in the southeast of France, near the town of Box. Hence the name bauxite. At first this industry developed at a slow pace. But when mankind appreciated what kind of aluminum ore is useful for production, the scope of aluminum has expanded significantly. Many countries began to search deposits on their territories. Thus, world mining of aluminum ores began to increase gradually. This is confirmed by figures. So, if in 1913 the world volume of extracted ore was 540 thousand tons, then in 2014 - more than 180 million tons.

Also, the number of countries extracting aluminum ore gradually increased. To date, there are about 30. But over the past 100 years, leading countries and regions have been constantly changing. Thus, at the beginning of the 20th century, the world leaders in the extraction of aluminum ore and its production were North America and Western Europe. These two regions accounted for about 98% of global production. After several decades, the leaders in the quantitative indicators of the aluminum industry were the countries of Eastern Europe, Latin America and the Soviet Union. And already in the 1950-1960-ies the leader in terms of production was Latin America. And in the 1980-1990's. There was a rapid breakthrough in the aluminum industry in Australia and Africa. In the current world trend, the main countries-leaders in the extraction of aluminum are Australia, Brazil, China, Guinea, Jamaica, India, Russia, Suriname, Venezuela and Greece.

Ore deposits in Russia

In terms of aluminum ore production, Russia ranks seventh in the world rating. Although aluminum ore deposits in Russia provide the country with a large amount of metal, it is not enough to fully provide the industry. Therefore, the state is forced to buy bauxite in other countries.

A total of 50 deposits of ore are located on the territory of Russia. This number includes both the places where the mineral is mined and the deposits not yet developed.

Most of the ore reserves are in the European part of the country. Here they are located in Sverdlovsk, Arkhangelsk, Belgorod region, in the Republic of Komi. All these regions contain 70% of all the explored ore reserves of the country.

Aluminum ores in Russia are still mined in old bauxite deposits. Such areas include the Radynskoye field in the Leningrad region. Also, due to a shortage of raw materials, Russia uses other aluminum ores whose deposits are characterized by the inferior quality of mineral deposits. But they are still suitable for industrial purposes. Thus, in Russia, nepheline ores are mined in large quantities, which also make it possible to obtain aluminum.

Similar articles

 

 

 

 

Trending Now

 

 

 

 

Newest

Copyright © 2018 en.birmiss.com. Theme powered by WordPress.