bentonite - .: dal cin spa · 2014-06-24 · pag3 eng.ppt author: francesca tornaghi created date:...
TRANSCRIPT
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
! 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
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
Bentonite Dal Cin Escavation from mine
Shipment
Unloading in stock area
Bentonite Dal Cin Laboratory analysis
Warehouse
Micronization
Bentonite “calcic”
Bentonite “medium activation”
Bentonite “strong activation”
Bentonite range
Bentonite “micro”
Bentonite “grain”