石膏的應(yīng)用非常廣泛，在建材行業(yè)生產(chǎn)中如何挑選好的石膏粉呢？下面就讓
濟(jì)南石膏粉廠家為您講一講有關(guān)方法吧。
Gypsum is widely used. How to choose a good gypsum powder in the production of building materials industry? Now let Jinan gypsum powder manufacturer tell you about the relevant methods.
從外觀上判斷
Judging from appearance
通過外觀上觀察和手感可初步判斷石膏粉質(zhì)量的優(yōu)劣。就是看石膏粉的外觀顏色，手感就是用手搓一搓石膏粉的糙細(xì)程度(細(xì)度）。
The quality of gypsum powder can be preliminarily judged by appearance observation and hand feeling. It depends on the appearance and color of gypsum powder. The feel is to rub the roughness (fineness) of gypsum powder with your hands.
外觀上看，白度高的石膏粉細(xì)度目數(shù)高，質(zhì)量好，價(jià)格較高；而發(fā)灰發(fā)黑、里面有黑色雜質(zhì)的石膏粉質(zhì)量較差。用手的拇指和食指搓捻石膏粉,手感發(fā)沙粗糙的石膏粉細(xì)度糙，質(zhì)量較差、價(jià)格較低；而手感細(xì)膩的石音粉說(shuō)明細(xì)度細(xì)，質(zhì)量較好，價(jià)格也會(huì)較高。
In appearance, gypsum powder with high whiteness has high fineness, mesh number, good quality and high price; The gypsum powder with grey and black hair and black impurities inside is of poor quality. Twist the gypsum powder with the thumb and index finger of the hand. The gypsum powder that feels Sandy and rough has rough fineness, poor quality and low price; The stone tone powder with fine hand feel shows that it has fine fineness, good quality and high price.
測(cè)定結(jié)晶水含量
Determination of crystal water content
根據(jù)經(jīng)驗(yàn)和資料介紹,通過測(cè)定結(jié)晶水的含量，可判斷石膏粉質(zhì)量的好壞。一般合格的石膏粉結(jié)晶水的含量在4.5?5.5%之間^若石膏粉的結(jié)晶水含量遠(yuǎn)低于此標(biāo)準(zhǔn)值,則說(shuō)明石膏粉過燒,注模時(shí)凝結(jié)時(shí)間太長(zhǎng)甚至不凝固;若石膏粉的結(jié)晶水含量遠(yuǎn)高于此標(biāo)準(zhǔn)值，則說(shuō)明石膏粉欠火或者受潮,注模時(shí)凝結(jié)時(shí)間短。以上兩種情況的石膏粉都不合格,在生產(chǎn)中不能使用。
According to experience and information, the quality of gypsum powder can be judged by measuring the content of crystal water. Generally, the content of qualified gypsum powder crystal water is 4.5? 5.5%. If the crystal water content of gypsum powder is far lower than this standard value, it indicates that the gypsum powder is burned, and the setting time is too long or even does not solidify during injection molding; If the crystal water content of gypsum powder is much higher than this standard value, it indicates that gypsum powder is under fire or damp, and the setting time is short during injection molding. The gypsum powder in the above two cases is unqualified and cannot be used in production.
檢測(cè)石膏粉結(jié)晶水含量的方法是：精確稱取4(TC烘干后冷卻至室溫的試樣質(zhì)量G(—般為2?5g),放置于恒重的鉑金坩堝（或瓷坩堝）中，精確稱取其質(zhì)量為G1;在230±5°C下灼燒2h，取出移人干燥器內(nèi)，冷卻至室溫后稱取其質(zhì)量為G2，則其結(jié)晶水百分含量為(Gt—G2)/GX100%。
The method to detect the crystal water content of gypsum powder is: accurately weigh 4 (the mass g of the sample cooled to room temperature after TC drying (generally 2? 5g), place it in a platinum crucible (or porcelain crucible) with constant weight, and accurately weigh its mass as G1; Burn it at 230 ± 5 ° C for 2h, take it out and transfer it to the dryer. After cooling to room temperature, weigh its mass as G2, and then the percentage content of crystal water is (gt-g2) /gx100%.
生產(chǎn)中試注
Pilot injection in production
按生產(chǎn)中石膏和水的比例，確保所采用的器具、操作人員、設(shè)備和工藝方法一致，選擇一個(gè)小型胎型母模進(jìn)行生產(chǎn)模型的試注，與生產(chǎn)中正常使用的合格石膏粉的模型澆注過程進(jìn)行對(duì)比。若待測(cè)石裔粉凝結(jié)時(shí)間正常合理、操作順利不注桶，則說(shuō)明該石膏粉是合格的石膏粉;若待測(cè)石膏粉凝結(jié)時(shí)間非正常，凝結(jié)時(shí)間太短注桶，或者凝結(jié)時(shí)間太長(zhǎng)甚至不凝固，這樣的石膏粉不合格，生產(chǎn)中不能使用。
According to the proportion of gypsum and water in production, ensure that the appliances, operators, equipment and process methods used are consistent, select a small tire master mold for trial injection of the production model, and compare it with the model pouring process of qualified gypsum powder normally used in production. If the setting time of the stone powder to be tested is normal and reasonable, the operation is smooth, and the bucket is not injected, it indicates that the gypsum powder is qualified gypsum powder; If the setting time of the gypsum powder to be tested is abnormal, the setting time is too short, or the setting time is too long or even does not set, such gypsum powder is unqualified and cannot be used in production.
Here are three ways to select good gypsum powder in the production of building materials industry. If you have a demand for it, you can come to our website http://www.chnzylw.com Consult and understand.
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