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Bauxite & Alumina

Bauxite & Alumina

Bauxite is the main source of ore alumunium production. Bauxite contains 30-54% alumina (AI203) and a mixture of silica, various iron oxides, and titanium dioxide. ANTAM plans to augment the value of its bauxite reserves though the development of alumina projects.

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Bauxite

Bauxite, the raw material for the production of alumina, was first discovered in 1924 at Kijang, Bintan Island, in the province of Riau, in northwestern Indonesia. Bauxite from Bintan Island has been mined and exported since 1935. In 1968 ANTAM acquired the mine. Thus, ANTAM is Indonesia's longest running producer of bauxite. 

Following the closure of the Kijang bauxite mine in 2009, ANTAM is currently developing two alumina projects to further add value to its vast bauxite reserves in Kalimantan. More information on ANTAM's alumina projects can be found on our Development Project section. As of December 31, 2018, ANTAM has 31 million wmt of bauxite reserves and 578 million wmt of resources, all are located in West Kalimantan.

Alumina

ANTAM has Chemical Grade Alumina (CGA) in Tayan, West Kalimantan which are operated by PT Indonesia Chemical Alumina (PT ICA), the subsidiary Company's entity. 

In general, the term CGA refers to chemical products in the form of aluminium hydroxide and alumina used for various industrial applications except-for aluminium industry. Aluminium hydroxide is a semi-finished product that can be used for water purification. While alumina can be used to produce electronic support components. Some products that use CGA include refractoriness, abrasive, assembled products, integrated circuit (IC), as well as basic materials for LCD screens. Alumina processing in Tayan will produce chemical grade alumina products by processing bauxite ore through the Bayer process into alumina products with a capacity of 300,000 metric tons of Al2O3 (alumina) base per year. The Bayer process consists of three stages, namely Liquor Clarification process, Precipitation Process, and Calcination Process.

CGA production process starts from bauxite ore mining which is conducted by ANTAM’s bauxite mine. Bauxite production originated from Tayan bauxite mine in West Kalimantan. The mined bauxite is fed for consumption at the Tayan CGA plant in Tayan, West Kalimantan. The mine is conducted with open pit methods with excavator and truck. After the ore is mined, the ore is washed and screened to be transported to the Tayan CGA plant, which is located next to the mine. 

 

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Land Clearing

Ore Digging

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Ore Hauling

Washing Plant

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Ore Stockpile

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PABRIK CHEMICAL GRADE ALUMINA

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Caustic Soda + Precipitation

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Ore Stockpile

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Aluminium Hydroxide

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Calcination

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Processing Drying & Grinding

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Aluminum Oxide

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Chemical Grade Alumina

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Processing Grinding

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Pabrik Chemical Grade Alumina

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