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How to determine the pros and cons of gypsum powder

Release time: 2023-10-19 09:41:07

News source: Heilongjiang gypsum powder

　　How to determine the pros and cons of gypsum powder
　　How to determine the quality of gypsum powder according to the setting time of anhydrous gypsum powder the setting time includes initial setting time and final setting time。The quality standard of the setting time of gypsum powder is: under the standard consistency, the initial setting time is generally not less than 6min, and the final setting time is not more than 25min。Appropriate setting time is a prerequisite and necessary condition for the normal use of gypsum powder in production。Too short initial setting time or too long final setting time is not appropriate。If the initial setting time is too short in use，Less than 6min,Proves that the plaster powder is not cooked and raw，Or damp inside contains stone，Affect the injection mold operation,It is shown in the production of barrels，Delay production;If the final setting time is too long，Much larger than 25tnin,Which means the plaster was overburned during roasting，It contains burnt plaster，It is easy to leak slurry when injecting mold,Even gypsum slurry does not set，Affect production。
　　It is used as cement retarder and special cement raw material in cement production.In the chemical industry for the production of sulfuric acid, ammonium sulfate, etc.;Used in agriculture to improve soil or as soil fertilizer;Paints, pigments, paper, textiles and other industries used as coatings and fillers, as well as fillers and insecticide carriers for daily chemical products such as toothpaste, cream and chalk industries;It is used in the food industry to purify brewery water，Control the clarity of the wine，Or as a coagulant for edible tofu and animal feed additives calcium sulfate。
　　In appearance, the industrial gypsum powder with high whiteness has high fineness mesh, good quality and high price;The gypsum powder with gray and black hair and black impurities is of poor quality。Use the thumb and forefinger of the hand to twist the gypsum powder, feel sand rough gypsum powder fineness rough, poor quality, low price;The stone sound powder with fine feel has fine detail, better quality and higher price。