Vermiculite

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Type: Crude Vermiculite &

Detailed Introduction

Vermiculiteis ahydrousphyllosilicatemineralwhich undergoes significant expansion when heated.Exfoliationoccurs when the mineral is heated sufficiently, and commercial furnaces can routinely produce this effect. Vermiculiteforms by theweatheringorhydrothermal alterationofbiotiteorphlogopite.

Chemical Composition

SiO2: 38-46%

Al2O3: 7-9%

Fe2O3: 4-20%

MgO: 22-36%

CaO: 2.0-3.5%

K2O: 2.1-4.6%

TiO2: 0.2-1.5%

Packing: 50kg, 1,000kg, 1100kg or 1200kg bags.

VERMICULITE is the name given to a group of hydrated laminar minerals which are aluminium-iron-magnesium silicates, resembling mica in appearance.Vermiculite is a hydrous phyllosilicate mineral which undergoes significant expansion (exfoliation) when heated. It is very lightweight and mixes easily with other mediums.

consists of thin, flat flakes containing microscopic layers of water. EXFOLIATION On being subjected suddenly to high temperatures (700°C to 1000°C) vermiculite flakes will expand to many times their original size due to the microscopic layers of water turning to steam and forcing the laminar layers apart.

Crude vermiculite from the Palabora mine consists of golden/brown flakes which are carefully classified into five grades – each having a specified range of particle sizes. The coarsest grade comprises particles ranging between 8mm and 2.8mm, while the finest grade consists of particles between 0.710mm and 0.250mm in size.

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