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GB/T 5483-2008 English PDF (GBT5483-2008)

GB/T 5483-2008 English PDF (GBT5483-2008)

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GB/T 5483-2008: Natural gypsum

This standard specifies the terms and definitions, classification and level, requirements, test methods, inspection rules, markings, packaging, transport and storage of natural gypsum products.
GB/T 5483-2008
GB
NATIONAL STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
ICS 91.100.10
Q 62
Replacing GB/T 5483-1996
Natural gypsum
????????????
ISSUED ON. JUNE 30, 2008
IMPLEMENTED ON. APRIL 01, 2009
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Classification and level ... 6
5 Requirements ... 7
6 Test methods ... 7
7 Testing rules ... 8
8 Marking, packaging, transport and storage ... 9
Foreword
This standard replaces GB/T 5483-1996 ?€?Gypsum and anhydrite?€?.
As compared with GB/T 5483-1996, the main changes of this standard are as follows.
- CHANGE the standard name;
- MODIFY the ?€?Subject content and scope of use?€? into ?€?Scope?€? and MODIFY the contents (Chapter 1 of 1996 version; Chapter 1 of this version);
- MODIFY the ?€?Normative references?€?; ADD the introductory information;
ADD the year to the reference standards (Chapter 2 of 1996 version;
Chapter 2 of this version);
- ADD Chapter 3 ?€?Terms and definitions?€? (SEE Chapter 3);
- MODIFY the ?€?Product classification?€? into ?€?classification and level?€? (Chapter 4 of 1996 version; Chapter 4 of this version);
- MODIFY the ?€?block size?€? into ?€?specifications?€? (Clause 4.2 of 1996 version; Clause 4.2 of this version);
- DELETE the ?€?product name?€? from Table 1, and DELETE the molecular
formula (Table 1 of 1996 version; Table 1 of this version);
- ADD the ?€?Determination of free water?€? (Clause 6.1 of this version);
- ADJUST the clause on the ?€?Determination of grade?€? (Chapter 6 of 1996
version; Clause 6.2 of this version);
- USE the letter to replace substitute the molecular formula in the grade calculation (Chapter 6 of 1996 version; Clause 6.2.3 of this version);
- MODIFY the ?€?Acceptance rules?€? into ?€?Testing rules?€? (Chapter 7 of 1996 version; Chapter 7 of this version);
- MODIFY the ?€?Batch and number?€? into the ?€?Batching rules?€? (Clause 7.1 of 1996 version; Clause 7.1 of this version);
- DELETE the ?€?delivery and acceptance?€? from the original standard (Clause 7.2 of 1996 version);
- MODIFY the ?€?Sampling method?€? into ?€?Sampling method and same
preparation?€? (Clause 7.3 of 1996 version; Clause 7.2 of this version);
- MODIFY the ?€?Testing items and product testing form?€? into ?€?Testing?€?
(Clause 7.4 of 1996 version; Clause 7.3 of this version);
- MODIFY the clauses and contents of the ?€?Determination rules?€? from the original standard (Clause 7.5 of 1996 version; Clause 7.4 of this version); - MODIFY the ?€?Transport and storage?€? into ?€?Marking, packaging, transport, and storage?€? (Chapter 8 of 1996 version; Chapter 8 of this version);
This standard was proposed by the China Building Materials Federation.
This standard shall be under the jurisdiction of the National Non-metallic Mineral Products and Products Standardization Technical Committee.
The drafting organizations of this standard. Xianyang Institute of Non-metallic Minerals Research and Design Institute, China Building Materials Science Research Institute, Henan Institute of Building Materials Detection Co., Ltd. The main drafters of this standard. Jiao Hongbin, Zhang Xiufen, Wang Xianbin, Liu Yongchuan, Feng Deping.
This standard was first released in October 1985, first revised in 1996, AND this is the second revision.
Natural gypsum
1 Scope
This standard specifies the terms and definitions, classification and level, requirements, test methods, inspection rules, markings, packaging, transport and storage of natural gypsum products.
This standard applies to natural gypsum mineral products output in nature. 2 Normative references
The provisions in following documents become the provisions of this Standard through reference in this Standard. For the dated references, the subsequent amendments (excluding corrections) or revisions do not apply to this Standard; however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies. GB/T 2007.2-1987 General rules for the sampling and sample preparation
of minerals in bulk - Manual method of sample preparation
GB/T 5484 Methods for chemical analysis of gypsum
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
Grade
It refers to the content of the useful components or useful minerals per unit volume or unit mass of ore.
3.2
Free water (H2O-)
It refers to the moisture absorbed by the material from air.
3.3
Combined water (H2O+)
It refers to, in crystalline material, the certain amount of water molecules which are formed through combination with ions or molecules through the chemical bonding force.
3.4
Gypsum
It refers to the material which is mainly existed in the form of calcium sulfate dihydrate (CaSO4 ?€? 2H2O).
3.5
Anhydrite
It refers to the material which is mainly existed in the form of anhydrous calcium sulphate (CaSO4), wherein the ratio of the mass fraction of
anhydrous calcium sulphate (CaSO4) to the sum of the mass fraction of
calcium sulphate dihydrate (CaSO4 ?€? 2H2O) and anhydrous calcium
sulphate (CaSO4) is not less than 80%.
3.6
Mixed gypsum
It refers to the material which is mainly existed in the form of calcium sulfate dihydrate (CaSO4 ?€? 2H2O) and anhydrous calcium sulfate (CaSO4), wherein the ratio of the mass fraction of the anhydrous calcium sulfate (CaSO4) to the sum of the mass fraction of the calcium sulfate dihydrate (CaSO4 ?€? 2H2O) and anhydrous calcium sulfate (CaSO4) is less than 80%.
4 Classification and level
4.1 Classification
Natural gypsum products can be divided into three categories based on the mineral composition. gypsum (code G), anhydrite (code A), and mixed gypsum (code M).
4.2 Level
Each type of natural gypsum is divided into five levels based on the grade. special level, level 1, level 2, level 3, and level 4.
4.3 Specifications
Product block size is not greater than 400 mm. If there are special
requirements, they shall be as negotiated between the supplier and the
purchaser.
5 Requirements
5.1 Natural gypsum products free water content (mass fraction) is not more than 4%.
5.2 The grade of each natural gypsum product shall meet the requirements of Table 1.
Table 1
Level Grade (mass fraction) / % Gypsum (G) Anhydrite (A) Mixed gypsum (M) Special level ??? 95 - ??? 95
Level 1 ??? 85
Level 2 ??? 75
Level 3 ??? 65
Level 4 ??? 55
6 Test methods
6.1 Determination of free water
Determination of free water is in accordance with GB/T 5484.
6.2 Grade determination
6.2.1 Determination of combined water is in accordance with GB/T 5484.
6.2.2 Determination of sulfur trioxide is in accordance with GB/T 5484. 6.2.3 Grade calculation.
Where.
G1 - Grade of category G products, %;
G2 - Grade of category A and M products, %;
X1 - Mass fraction of CaSO4, %;
W - Mass fraction of combined water, %;
S - Mass fraction of sulfur trioxide, %.
7 Testing rules
7.1 Batching principles
Acceptance and supply of natural gypsum products are made by batch. The 300 t of natural gypsum of same category and same level which is supplied together is considered as one batch, AND those less than 300 t is also
considered as one batch.
7.2 Sampling methods and sample preparation
7.2.1 USE the grid method. It shall be in accordance with the ore mass, block uniformity, and ore pile volume to determine the grid spacing. During sampling, it shall take sample from different depths, AND the sampling amount is almost same for each sampling.
7.2.2 In case of bulk delivery, the number of sampling points per batch shall not be less than 10, and each sampling amount shall not be less than 10 kg, which constitutes the total sample; AND in case of packaged delivery, the number of packaging bags from which sample is taken in each batch shall be not less than 20, and each sampling amount shall not be less than 5 kg, which
constitutes the total sample.
7.2.3 Sample preparation
It shall be in accordance with the provisions of clause 4.3 in GB/T 2007.2-1987 on ?€?Sample preparation procedures?€?.
7.3 Testing
The basic analysis items include free water, combined water, and sulfur trioxide. Other analysis items shall be as agreed upon by both the supplier and purchaser.
7.4 Judgement rules
7.4.1 It shall be in accordance with the provisions of clause 5.2 of this standard to judge the product category, AND in accordance with the clause 6.2 to calculate the product grade.
7.4.2 Where there is an indicator in the test results does not meet the requirements of clause 5.1 ~ 5.2 of this standard, this indicator shall be re-tested. Retest results are used as the final determination results.
8 Marking, packaging, transport and storage
8.1 Marking
Each package shall have the product name, implemented standard ...

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