你知道有什么问题来测定石膏粉的优劣情况吗？实际上根据济南石膏粉的凝结时间凝结时间包括初凝时间和终凝时间。下面讲解一番：

Do you know any questions about determining the quality of gypsum powder? In fact, according to the setting time of Jinan gypsum powder, the setting time includes the initial setting time and the final setting time. Here is an explanation:

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。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。

The quality standard for the setting time of gypsum powder is: under standard consistency, the initial setting time is generally not less than 6 minutes, and the final setting time is not more than 25 minutes. The appropriate setting time is a prerequisite and necessary condition for the normal use of gypsum powder in production. Short initial setting time or long final setting time are not suitable.

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。

If the initial setting time is too short during use, less than 6 minutes, it indicates that the gypsum powder has not been fried and sandwiched, or there are raw stones inside due to moisture, which affects the injection molding operation, manifested as barrel injection during production and delays production; If the final setting time is too long, which is far more than 25tnin, it means that the gypsum is burned during frying, and it contains Bassanite, which is easy to leak slurry during mold injection, or even the gypsum slurry does not solidify, affecting 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；

Used as a cement retarder and special cement raw material in cement production; Used in the chemical industry to produce sulfuric acid, ammonium sulfate, etc;

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；

Used in agriculture to improve soil or as soil fertilizer; Used as coatings and fillers in industries such as paint, pigments, paper making, and textiles, as well as fillers and pesticide carriers in daily chemical products such as toothpaste, snow cream, and chalk;

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。

In the food industry, it is used to purify water used in breweries, control the clarity of alcohol, or as a coagulant for edible tofu, and as an animal feed additive such as calcium sulfate.

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. Rub and twist the gypsum powder with the thumb and index finger of your hand, resulting in a rough and sandy feel. The gypsum powder has a rough and fine texture, poor quality, and low price; And the stone tone powder with a delicate texture indicates fine fineness, good quality, and a higher price.

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