bentonite - dal cinpag3 eng.ppt author francesca tornaghi created date 20130206113720z
TRANSCRIPT
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Bentonite
Bentonite is a natural clay belonging to the Smectite family
The main component is called montmorillonite
It is a layered structure with negative charge
It comes from the alkaline degradation of the feldspar mineral
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! calcic bentonite ! calcic activated bentonite (sodic activated) ! natural sodic bentonite
Tetrahedral sheet - SiO2
Octahedral sheet - Al2O3 - Al2(OH)6
Tetrahedral sheet - SiO2
Compensation cation (Ca++ Na+…)
Tetrahedral sheet - SiO2
The structure
Bentonite: Al(Fe2,Mg3)Si4O10(OH)2 .nH2O
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The process ACTIVATION ! Substitution of compensation cations within the
interlayer space ! Control of chemical-physical process parameters
PURIFICATION ! Decrease of undesired metallic elements ! Decrease of mineralogical contamination ! Removal of microbiological pollutant
TRANSFORMATION ! Micronisation into fine powders ! Aggregation and granulating process
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Bentonite Dal Cin Escavation from mine
Shipment
Unloading in stock area
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Bentonite Dal Cin Laboratory analysis
Warehouse
Micronization
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Bentonite “calcic”
Bentonite “medium activation”
Bentonite “strong activation”
Bentonite range
Bentonite “micro”
Bentonite “grain”