测定济南石膏粉的优劣情况可以怎么做？根据无水石膏粉的凝结时间凝结时间包括初凝时间和终凝时间。石膏粉凝结时间的质量标准是：在标准稠度下，一般初凝时间不小于6min,终凝时间不大于25min。

What can be done to determine the quality of Jinan gypsum powder? According to the setting time of anhydrite powder, the setting time includes initial setting time and final setting time. The quality standard for setting time of gypsum powder is: under standard consistency, the initial setting time is generally not less than 6 min, and the final setting time is not more than 25 min.

适宜的凝结时间是石膏粉在生产中正常使用的先决和必要的条件。初凝时间过短或终凝时间过长都不合适。如果在使用中初凝时间太短，小于6min,则证明石膏粉没有炒熟夹生，或受潮内部含有生石裔，影响注模操作,表现为生产中注桶，耽误生产;若终凝时间太长，远大于25tnin,则说明石膏在炒制时过烧，里面含有过烧石膏，表现为注模时易漏浆,甚至石膏浆不凝固，影响生产。

Proper setting time is the prerequisite and necessary condition for normal use of gypsum powder in production. The initial setting time is too short or the final setting time is too long. If the initial setting time in use is too short, less than 6 min, it is proved that the gypsum powder is not fried and sandwiched, or there is raw stone in the damp interior, which affects the injection operation, which is manifested as barrel injection in production, delaying production; If the final setting time is too long, which is much longer than 25tnin, it indicates that the gypsum is burnt during the frying process, and contains burnt gypsum, which is easy to leak during the injection molding, and even the gypsum slurry does not solidify, affecting the production.

在水泥生产中用于作水泥缓凝剂、特种水泥原料；在化学工业中用于制硫酸、硫酸铵等；在农业上用于改良土壤或作土壤肥料；油漆、颜料、造纸、纺织等行业用作涂料和填料以及用作日化产品如牙膏、雪花膏以及粉笔等行业的填料以及杀虫剂载体；在食品工业中用于净化啤酒厂用水，控制酒的清澈度，或作食用豆腐的凝结剂以及动物饲料添加剂硫酸钙等。

Used as cement retarder and special cement raw material in cement production; It is used in the chemical industry to produce sulfuric acid, ammonium sulfate, etc; Used in agriculture to improve soil or as soil fertilizer; Paint, pigment, paper making, textile and other industries are used as paints and fillers, as well as fillers and pesticide carriers for daily chemical products such as toothpaste, snow cream, chalk and other industries; It is used in the food industry to purify the water used in breweries, control the clarity of wine, or as a coagulant for edible tofu and calcium sulfate as an animal feed additive.

外观上看，白度高的工业石膏粉细度目数高，质量好，价格较高；而发灰发黑、里面有黑色杂质的石膏粉质量较差。用手的拇指和食指搓捻石膏粉,手感发沙粗糙的石膏粉细度糙，质量较差、价格较低；而手感细腻的石音粉说明细度细，质量较好，价格也会较高。

In terms of appearance, industrial gypsum powder with high whiteness has high fineness, good quality and high price; The quality of gypsum powder with gray and black hair and black impurities inside is poor. Twist the gypsum powder with the thumb and forefinger of your hand. The gypsum powder with coarse sand feel is coarse in fineness, poor in quality and low in price; And the stone tone powder with fine feel shows fine fineness, good quality and high price.

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