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石膏原料分为天然石膏和工业副产品石膏。随着工业和科学技术的发展,根据石膏的特性
和使用方法,石膏的用途大致可以分为两大类:第一石膏不经缎烧而直接使用,主要用于调节
水泥凝结、冶炼镍、豆腐凝固、光学器械、石膏铸型等;第二石膏经缎烧变成熟石膏,用于
生产建筑材料、陶瓷模型、牙料、粉笔、工艺品、研磨玻璃、豆腐凝固等。其中,石膏胶
凝材料是传统的三大胶凝材料之一。它的原料可用天然石膏和工业副产石膏,它们的主要
成分是二水硫酸钙和无水硫酸钙。

Gypsum raw material is divided into natural gypsum and industrial by-product gypsum. With the development
of industry and science and technology, according to the characteristics and application methods of gypsum, the
USES of gypsum can be roughly divided into two categories: the first gypsum is not directly used by satin
burning, and it is mainly used to adjust cement setting, smelting nickel, bean curd solidification, optical
instruments, gypsum casting; The second gypsum is transformed into plaster of Paris by satin burning, which is
used to produce building materials, ceramic models, dental materials, chalk, handicrafts, grinding glass, bean
curd solidification and so on. Gypsum cementitious material is one of the three traditional cementitious
materials. Its raw materials can be natural gypsum and industrial by-product gypsum, and their main
components are calcium sulfate dihydrate and anhydrous calcium sulfate.

石膏型的制作工序，包括混制浆料、灌注、除气、凝固成型、焙烧
等，其中石膏型的焙烧是一个关键环节，它直接影响到铸形的强度、
表面质量、铸件质量等。

The production process of gypsum mold includes mixing slurry, pouring, degassing,
solidification, roasting, etc. The roasting of gypsum mold is a key link, which directly
affects the strength, surface quality and casting quality of the casting.