GB/T 23456-2025 English PDF - Phosphogypsum Standard
Phosphogypsum
Standard Details
GB/T 23456-2025 (English Version)
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GB/T 23456-2025 (Chinese Version)
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Standard Introduction
This document specifies the classification, marking, technical requirements, inspection rules, packaging, marking, transportation and storage of phosphogypsum, and describes the corresponding test methods.
This document applies to the by-products primarily composed of calcium sulfate dihydrate (CaSO₄·2H₂O) and/or calcium sulfate hemihydrate (CaSO₄·1/2H₂O) and calcium sulfate anhydrous (CaSO₄), which are generated during the production of wet-process phosphoric acid using phosphate rock as the raw material.
Standard Catalog
The standard consists of the following main sections:
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
3.1 mixed phosphogypsum
4 Classification and Marking
4.1 Classification
4.2 Marking
5 Technical Requirements
5.1 Basic Requirements
5.2 Heavy Metal Limits
6 Test Methods
6.1 Content of Calcium Sulfate Dihydrate (CaSO₄·2H₂O) or Mixed Phosphogypsum
6.2 Free Moisture (H₂O) Content
6.3 Water-soluble Phosphorus Pentoxide (P₂O₅) Content
6.4 Water-soluble Fluoride Ion (F⁻) Content
6.5 Water-soluble Magnesium Oxide (MgO) Content
6.6 Water-soluble Sodium Oxide (Na₂O) Content
6.7 Chloride Ion (Cl⁻) Content
6.8 Organic Matter Content
6.9 pH Value
6.10 Radionuclide Limits
6.11 Heavy Metal Limits
7 Inspection Rules
7.1 Inspection Classification
7.2 Lot Size and Sampling
7.3 Judgment
8 Packaging, Marking, Transportation and Storage
8.1 Packaging
8.2 Marking
8.3 Transportation
8.4 Storage
Appendix
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