Calcium sulfate, a chemical compound with the formula CaSO4, exists in various forms, but the two most common ones are gypsum (calcium sulfate dihydrate) and anhydrite (calcium sulfate anhydrous). Gypsum is a soft, white mineral often used in construction and agriculture. It is a key ingredient in plasterboard, where it provides fire resistance and soundproofing. In agriculture, gypsum is employed to improve soil structure and nutrient retention. Anhydrite, on the other hand, is a denser, less water-absorbent form of calcium sulfate and is used in industrial processes, including cement production. Both forms of calcium sulfate have distinct properties that make them valuable in a range of applications, from building materials to industrial chemistry.
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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%.
