你知道有什么問題來測定石膏粉的優劣情況嗎？實際上根據濟南石膏粉的凝結時間凝結時間包括初凝時間和終凝時間。下面講解一番：

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。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。

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。

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；

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；

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。

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. 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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