1. Gypsum powder quality standard: in compliance with GB/T 9776-2008
2. Main Technology(here take Nature gypsum rock as example)
Gypsum rock - first crushing -second crushing - grinding - calcining - aging -finished products (CaSO4.1/2H2O)
After being heated and calcined with certain temperature,natural dihydrate gypsum is dehydrated and decompounded,to get the product whose major component is semi-hydrated gypsum(CaSO4.1/2H2O),that is,calained gypsum(generally slaked gypsum).According to different temperatures and pressure conditions during dehydration decomposition,the obtained product is β-Type calcined gypsum.Basic process of mechanized prouduction includes five large systems:gypsum grinding,automatic measuring system,calcination system,heat supply system,and aging&packing system.According to client's requirement,gypsum crushing system can be added to crush large gypsum rock to be with size of 0-30mm,and then conveyed into grinding system.
3.Payment conditions:
A. Payment terms: 30% T/T in advance; 70%L/C or T/T
B. We can provide quality guarantee;
C. Kunlun bank account available to make convenient for Iranian client
National Standard of Calcined Gypsum
Standard No.: GB/T 9776-2008
Scope of application:
Gelled material made by dehydrating natural gypsum(raw material). Its main component isβ-GaSO4·1/2H2O, without any admixture or additive.
The natural gypsum should be in conformity with requirements of "gypsum rock(JC/T700) for making cementing material" gypsum rock of Grade 3 or more higher grades.
Classification:
It is classified to be three grades: 3.0,2.0,and 1.6 according to its 2h strength(breaking strength).
Composition:
β-GaSO4·1/2H2O content(mass fraction) in Calcined gypsum should be not less than 60.0%.
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