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GB/T 36141-2018: Methods for phase composition analysis of calcined gypsum
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 36141-2018 | English | 199 |
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Methods for phase composition analysis of calcined gypsum
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GB/T 36141-2018
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Basic data | Standard ID | GB/T 36141-2018 (GB/T36141-2018) | | Description (Translated English) | Methods for phase composition analysis of calcined gypsum | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Q27 | | Classification of International Standard | 91.100.10 | | Word Count Estimation | 10,188 | | Date of Issue | 2018-05-14 | | Date of Implementation | 2019-04-01 | | Regulation (derived from) | National Standards Announcement No. 6 of 2018 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 36141-2018: Methods for phase composition analysis of calcined gypsum---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(Building gypsum phase composition analysis method)
ICS 91.100.10
Q27
National Standards of People's Republic of China
Analysis method of building gypsum phase composition
Published on.2018-05-14
Implementation of.2019-04-01
State market supervision and administration
China National Standardization Administration issued
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China Building Materials Federation.
This standard is under the jurisdiction of the National Technical Committee for Standardization of Lightweight and Decorative Building Materials (SAC/TC195).
This standard is drafted by. Wuhan University of Technology, Xinjiang Building Materials Research Institute, Shanghai Institute of Building Research (Group) Limited
the company.
Participated in the drafting of this standard. Beixin Group Building Materials Co., Ltd., METTLER TOLEDO International Trading (Shanghai) Co., Ltd., Changzhou
City Building Science Research Institute Co., Ltd., Taishan Gypsum Co., Ltd., Shanghai Daily Energy Saving and Environmental Protection Technology Co., Ltd., Sai Duo
Lisi Scientific Instrument (Beijing) Co., Ltd., Meichao Group Co., Ltd., Guangzhou Liwan Top Instrument Co., Ltd., Qinghai Bochuan Mining Development
Limited company.
The main drafters of this standard. Yang Xinya, Sun Fan, Liu Tao, Ye Yihong, Qian Yaoli, Zhou Mengwen, Ji Wei, Yang Jiangjin, Zhang Jingyan, Ren Xulian,
Li Tao, Chen Xiang, Li Yongxin, Wu Yongxiang, Yuan Xuchuan.
Introduction
The issuing organization of this document draws attention to the fact that when the statement conforms to this document, it may involve the relevant patent ZL201110033606.1
The use of rapid phase composition analysis methods for building gypsum.
The issuing organization of this document has no position on the authenticity, validity and scope of the patent.
The holder of the patent has assured the issuing authority of this document that he agrees that the user of this document may use the relevant technology of the patent free of charge.
content. The patent holder's statement has been filed with the issuing authority of this document. Information can be obtained by contacting.
Name of Patent Holder. Shanghai Academy of Building Research (Group) Co., Ltd.
Address. No. 75 Wanping South Road, Xuhui District, Shanghai
Note that in addition to the above patents, certain aspects of this document may still involve patents. The issuing organization of this document does not undertake to identify these patents.
Responsibility.
Analysis method of building gypsum phase composition
1 Scope
This standard specifies the oven method and moisture analyzer method for the analysis of the phase composition of building gypsum.
This standard applies to soluble gypsum in building gypsum powder prepared by calcination of dihydrate gypsum (natural gypsum or industrial by-product gypsum).
Analysis of three-phase content of (AIII), hemihydrate gypsum (HH), and dihydrate gypsum (DH).
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 6682 Analytical laboratory water specifications and test methods
3 Principle
3.1 Soluble anhydrite in building gypsum (AIII)
Soluble anhydrite (AIII) is hygroscopic, and its absorption of water in the air can be converted into hemihydrate gypsum (HH), so it is soluble.
Water gypsum (AIII) and attached water are not present in the sample at the same time. Soluble anhydrite (AIII) can be hydrated in 95% aqueous ethanol solution
Hemihydrate gypsum, under the same conditions, hemihydrate gypsum (HH) can not be hydrated into dihydrate gypsum (DH), so it can be determined by measuring soluble stone
The content of the paste (AIII) hydrated in a 95% aqueous solution of ethanol was calculated. Its hydration reaction is as follows.
CaSO4 0.5H2O=CaSO4·0.5H2O
The content of soluble anhydrite (AIII) was calculated according to the chemical reaction formula.
If there is no soluble anhydrite (AIII) in the sample, the quality of the sample before drying is greater than the mass after drying the constant weight, and the attached water can be calculated.
Quality score.
3.2 Hemihydrate gypsum (HH) in building plaster
Hemihydrate gypsum (HH) and soluble anhydrite (AIII) can be fully hydrated into dihydrate gypsum (DH) in pure water.
The hydration increment in pure water, ie the total amount of hemihydrate gypsum (HH) and soluble anhydrite (AIII) to form dihydrate gypsum (DH), minus
The content of soluble anhydrite (AIII) measured by 3.1 principle (when the anhydrous gypsum (AIII) phase is not included, the attached water should be baked.
The mass loss) can be used to calculate the content of hemihydrate gypsum (HH). Its hydration reaction is as follows.
CaSO4·0.5H2O 1.5H2O=CaSO4·2H2O
CaSO4 2H2O=CaSO4·2H2O
3.3 Residual dihydrate gypsum (DH) in building gypsum
Heating the building gypsum to.200 ° C or above, dihydrate gypsum (DH) dehydrated into soluble anhydrite (AIII), the total amount of dehydration is
The sum of the dehydration amounts of dihydrate gypsum (DH) and hemihydrate gypsum (HH) and attached water, minus the amount of dehydration of hemihydrate gypsum (HH) and attached water, ie
The residual dihydrate gypsum (DH) content can be calculated. The heating and dehydration reaction formula is as follows.
CaSO4·2H2O=
CaSO4 2H2O
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