KAOLIN

The kaolin subgroup of layer silicate clay minerals includes halloysite, nacrite, dickite, kaolinite and odinite. Except for odinite and halloysite, these industrially essential minerals show the same chemical composition: Al2Si2O5(OH)4. Mainly formed by the weathering of feldspar and muscovite (for example, alteration of granitic rocks), kaolin minerals are prevalent in the sediments and soils of tropical and temperate regions. Kaolinite is used to manufacture a variety of brick, ceramic and cosmetic products and as filler material in plastic, paint, rubber and paper. This and other kaolin minerals have played a prominent role in human cultural history in the United States and abroad. Kaolin mining has a history in the Southeastern United States, notably, central Georgia (1897 to present), which, according to its Washington County residents, hosts the “kaolin capital of the world.” Key producing countries outside the United States include Uzbekistan, Ukraine, China, India, Germany, and the Czech Republic. Global players in the market include BASF SE, Sibelco and Imerys SA. Production and consumption According to the U.S. Geological Survey’s (USGS) 2024 Mineral Commodities Summary, domestic clay production in 2023 was estimated at 26 Mt for a total market value of $1.7 billion, with approximately 120 companies operating mines in 38 states. Kaolin minerals account for about 4.4 Mt, or 16.9 percent of all clay materials recovered in the United States. Half the total kaolin (about 52 percent) went into developing coatings, fillers, extenders and binders, while about 25 percent was used in ceramic products. Exports and imports In 2023, the USGS estimated the United States exported 1.8 Mt of kaolin minerals to Mexico, China and Japan. Compared to 2022, the total clay and shale exports decreased by 10 percent. By comparison, in 2023, only 0.15 Mt of kaolin was imported into the United States. Kaolin exports were valued at $288 million, and imports at $24 million, resulting in a positive U.S. trade balance of $264 million. Trends and outlook According to Grand View Research Inc., the global kaolin market is forecasted to grow at a compound annual growth rate of 4 percent from 2024 to 2030. Investment in the construction market, increasing demand for paints and coatings, ceramicbased products and cement will drive market growth. Emphasis on green construction will boost the kaolin market. According to a report from the World Bank’s International Finance Corp., green construction will generate investment opportunities worth $1.5 trillion in emerging markets. Increasing demand for plastics from the construction and packaging industries, especially in China and India, is also propelling the demand for kaolin. Plastics are used in façade panels, exterior coatings and carpentry, and the increasing number of nuclear families in India and China is promoting the demand for plastics. However, market growth can be impeded by stringent regulations against kaolin mining. Many kaolin mines occur near biodiversity hotspots, potentially degrading water and air bodies. Introducing suspended particles into the air can cause respiratory problems, while the water generated from mining operations can alter the pH level and impact the aquatic flora and fauna. References are available from the author.

KAOLIN

Authored by:
Debashis Das P. E.

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To view the past issues of the UCA magazine you must be a member of SME/UCA.

Industrial Minerals review 2023

KYANITE, ANDALUSITE AND SILLIMANITE

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