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Alumina/Bauxite

Latest News

  • South32’s hydrate output declines

    Friday, 20 January 2017

    Alumina hydrate production posts a slight decline in South32's Q2 of FY2017, but remains in line with the company’s annualised rate.

  • Metro combines bauxite projects following Gulf acquisition

    Wednesday, 18 January 2017

    The company plans to start construction of a mine at the now joined Australian bauxite site in the second half of the year.

  • Rio posts higher bauxite, alumina output in 2016

    Tuesday, 17 January 2017

    Higher output at Rio’s main bauxite mines was supported by strong demand seen in China, while speciality alumina production also increased in 2016.

  • Indonesia eases bauxite export ban

    Friday, 13 January 2017

    Indonesia’s relaxing of export regulations to partially allow foreign sales of bauxite may ease the tightness in alumina feedstock for white fused alumina production in China, while other non-metallurgical bauxite markets are expected to remain short.

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Pricing News

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Features

  • 2016 Year in Review

    Thursday, 15 December 2016

    A round up of the year's main events in major global industrial minerals markets such as lithium, agriminerals, rare earths and titanium dioxide.

  • Cut and thrust in the global abrasives market

    Monday, 22 August 2016

    The global abrasives market is a fairly steady one, but new innovations in application technology are helping to compensate for areas of shrinking demand, Rose Pengelly, IM Correspondent, discovers.

  • India’s refractories industry: Ready to recover?

    Monday, 22 August 2016

    India’s economy and steel sector have been among a select few worldwide to post healthy levels of growth amid stagnant global GDP rates, but Chinese steel dumping and overcapacity have curtailed growth in the country’s refractories industry, Sunder Singh, IM Correspondent, explains.

  • World refractories industry: State of play in 2016

    Monday, 22 August 2016

    Jessica Roberts assesses the health of the refractory industry’s key consumers so far in 2016, and outlines longer term trends that look to influence the market this year and beyond.

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Market Brief

Bauxite is the primary source of aluminium metal, and about 85% of bauxite mined is processed via the Bayer Process to make alumina trihydrate (ATH), then smelter grade alumina (SGA) from which aluminium metal is derived.


The respective processes take place in an alumina refinery and aluminium smelter, which may or may not be integrated.


The remaining 15% of crude bauxite mined is used to produce a range of non-metallurgical bauxite grades and non-metallurgical alumina grades.

 

Bauxite

There are three main bauxites types – boehmite, diaspore, and gibbsite – which each differ in chemical and physical characteristics, and each have predominance in certain regions of the world.

 

Owing to their different characteristics, bauxites are carefully selected for non-metallurgical uses as demanded by the required end use specifications of the derived bauxite and alumina grades.

 

According to the USGS, 201m. tonnes of bauxite was mined in 2009.

 

Although metallurgical grade bauxite may be suitable for certain non-metallurgical applications, such as in cements and slag conditioning, most non-metallurgical bauxites are confined to specific regions in Australia, Brazil, China, France, Guinea, Greece, Guyana, Turkey and the USA.

 

The primary sources of non-metallurgical bauxite are China, Greece, Guyana and Turkey.

 

About 5% of bauxite is mined and processed for direct use as non-metallurgical bauxite grades. Raw, uncalcined bauxite is used for cement, slag conditioning, and chemicals.

 

Calcined bauxite is produced to make abrasive, refractory, welding, and proppant grades.

 

Abrasive grade bauxite is fused to manufacture brown fused alumina used in abrasives and refractories.

 

Alumina

The remaining mined bauxite, about 10%, is processed using the Bayer Process to manufacture ATH, the precursor to a range of non-metallurgical grade alumina (NMGA) grades which serve a wide variety of end uses.

 

Although there are specific NMGA plants, some SGA refineries also host a certain amount of capacity for NMGA production. This may change as market demand for SGA and NMGA dictates.

 

This NMGA market is estimated to total 5.5-5.8m. tpa. The bulk of the NMGA market is termed “commodity hydrate”, eg. used to make aluminium sulphate for water treatment (see pie charts), although fine grades are used as high value flame retardants.

 

The remainder, some 2.8m. tpa is defined as “speciality” or “premium” grades, which are based on calcined aluminas. These are used in higher value end uses, such as in refractories, ceramics, and polishing.

 

Calcined aluminas are also the feedstock to produce high value, high purity grades of tabular alumina and white fused alumina.

 

Bauxite producers

Bosai Minerals Group – China

Demireller Mining – Turkey

Hellenic Mining Enterprises – Greece

S&B Industrial Minerals – Greece

 

Alumina producers

Alcoa – USA

Almatis – Germany

Aluchem – USA

MAL Magyar Aluminium – Hungary

Martinswerk – Germany

Nabaltec – Germany

Alteo – France

 

Fused alumina producers

C-E Minerals (part of Imerys) – USA

Elfusa – Brazil

Henan Mianchi Great Wall Corundum – China

Treibacher Schleifmittel – Austria

Washington Mills Electro Minerals – USA