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GB/T 23456-2018 English PDF (GBT23456-2018)

GB/T 23456-2018 English PDF (GBT23456-2018)

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GB/T 23456-2018: Phosphogypsum

This Standard specifies the classification and labeling, requirements, test methods, inspection rules, as well as packaging, marking, transportation and storage of phosphogypsum. This Standard is applicable to phosphogypsum, which is obtained when phosphoric acid is produced through the wet method, using phosphate ore as the raw material, and with calcium sulfate dihydrate (CaSO4 ? 2H2O) as the main component.
GB/T 23456-2018
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 91.100.10
Q 62
Replacing GB/T 23456-2009
Phosphogypsum
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ISSUED ON: JUNE 7, 2018
IMPLEMENTED ON: MAY 1, 2019
Issued by: State Administration for Market Regulation;
Standardization Administration of the PEOPLE Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Classification and Labeling ... 5
4 Requirements ... 5
5 Test Methods ... 6
6 Inspection Rules ... 7
7 Packaging, Marking, Transportation and Storage ... 8
Phosphogypsum
1 Scope
This Standard specifies the classification and labeling, requirements, test methods, inspection rules, as well as packaging, marking, transportation and storage of phosphogypsum. This Standard is applicable to phosphogypsum, which is obtained when phosphoric acid is produced through the wet method, using phosphate ore as the raw material, and with calcium sulfate dihydrate (CaSO4 ??? 2H2O) as the main component.
2 Normative References
The following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 5484-2012 Methods for Chemical Analysis of Gypsum
GB 6566 Limits of Radionuclides in Building Materials
JC/T 2073 Determination of Phosphorus and Fluorine Content in Phosphogypsum 3 Classification and Labeling
3.1 Classification
In accordance with the content of calcium sulfate dihydrate, from high to low, the product is mainly classified into Grade-1, Grade-2 and Grade-3.
3.2 Labeling
Labeling is performed in accordance with the sequence of product name, standard serial No. and classification.
EXAMPLE: Grade-1 phosphogypsum is labeled as follows: Phosphogypsum GB/T 23456-2018 Grade-1.
4 Requirements
4.1 Basic Requirements
5.2.2 Calculation of calcium sulfate dihydrate (CaSO4 ??? 2H2O) content
The content of calcium sulfate dihydrate (CaSO4 ??? 2H2O) is calculated in accordance with Formula (1), and the calculation result is accurate to 0.01%.
Where,
G---the content of calcium sulfate dihydrate (CaSO4 ??? 2H2O), expressed in (%); 4.7785---the coefficient of converting the crystallization water content into calcium sulfate dihydrate (CaSO4 ??? 2H2O) content;
H---the content of crystallization water, expressed in (%).
5.3 Water-soluble Phosphorus Pentoxide (P2O5)
Carry out the test in accordance with JC/T 2073.
5.4 Water-soluble Fluoride Ions (F?€?)
Carry out the test in accordance with JC/T 2073.
5.5 Water-soluble Magnesium Oxide (MgO)
Carry out the test in accordance with Chapter 27 of GB/T 5484-2012.
5.6 Water-soluble Sodium Oxide (Na2O)
Carry out the test in accordance with Chapter 28 of GB/T 5484-2012.
5.7 Chloride Ions (Cl?€?)
Carry out the test in accordance with Chapter 29 of GB/T 5484-2012.
5.8 Limits of Radionuclides
Carry out the test in accordance with GB 6566.
5.9 pH Value
Carry out the test in accordance with Chapter 25 of GB/T 5484-2012.
6 Inspection Rules
6.1 Inspection Classification
6.1.1 Exit-factory inspection
The exit-factory inspection items are attached water (H2O), calcium sulfate dihydrate (CaSO4 ??? 2H2O) content, water-soluble phosphorus pentoxide (P2O5), water-soluble fluoride ions (F?€?) and pH value.
6.1.2 Type inspection
The type inspection items all items specified in Chapter 4. Under one of the following circumstances, type inspection shall be carried out:
a) When there are major changes in raw materials, processes and equipment; b) When the production is resumed after being discontinued for more than half a year; c) After one year of normal production.
6.2 Batch Size and Sampling
6.2.1 Batch size
5,000 t of products are considered as one batch, and products less than 5,000 t are also counted as one batch.
6.2.2 Sampling
When sampling from the stockyard, the outer layer of the material about 500 mm thick shall be removed, more than 20 different parts shall be selected, and a total of about 10 kg of specimens shall be taken. After mixing, divide the specimens into 2 kg using the quartering method. Divide the sample taken into two equal parts, one as the test sample and the other as the backup sample; keep them sealed.
6.3 Determination
If the inspection results comply with all the requirements in Chapter 4, then, the batch of products shall be determined as qualified. If two or more items (including two items) fail to satisfy the requirements, then, the batch of products shall be determined as disqualified. If only one item is disqualified, then, use the backup sample to conduct a re-inspection on the disqualified item. If it passes the re-inspection, then, the batch of products shall be determined as qualified; if it still fails, then, the batch of products shall be determined as disqualified. 7 Packaging, Marking, Transportation and Storage
7.1 Packaging
The products can be supplied in bulk or packages.
7.2 Marking
Products leaving the factory shall be accompanied by a product inspection certificate. The

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