測定濟南石膏粉的優劣情況可以怎么做？根據無水石膏粉的凝結時間凝結時間包括初凝時間和終凝時間。石膏粉凝結時間的質量標準是：在標準稠度下，一般初凝時間不小于6min,終凝時間不大于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.

適宜的凝結時間是石膏粉在生產中正常使用的先決和必要的條件。初凝時間過短或終凝時間過長都不合適。如果在使用中初凝時間太短，小于6min,則證明石膏粉沒有炒熟夾生，或受潮內部含有生石裔，影響注模操作,表現為生產中注桶，耽誤生產;若終凝時間太長，遠大于25tnin,則說明石膏在炒制時過燒，里面含有過燒石膏，表現為注模時易漏漿,甚至石膏漿不凝固，影響生產。

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.

在水泥生產中用于作水泥緩凝劑、特種水泥原料；在化學工業中用于制硫酸、硫酸銨等；在農業上用于改良土壤或作土壤肥料；油漆、顏料、造紙、紡織等行業用作涂料和填料以及用作日化產品如牙膏、雪花膏以及粉筆等行業的填料以及殺蟲劑載體；在食品工業中用于凈化啤酒廠用水，控制酒的清澈度，或作食用豆腐的凝結劑以及動物飼料添加劑硫酸鈣等。

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.

外觀上看，白度高的工業石膏粉細度目數高，質量好，價格較高；而發灰發黑、里面有黑色雜質的石膏粉質量較差。用手的拇指和食指搓捻石膏粉,手感發沙粗糙的石膏粉細度糙，質量較差、價格較低；而手感細膩的石音粉說明細度細，質量較好，價格也會較高。

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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