GB/T 21634-2020Triple superphosphate (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 21634-2008 "Heavy Superphosphate". Compared with GB/T 21634-2008, except for editorial changes, the main The technical changes are as follows.

---Updated some normative references (see Chapter 2, Chapter 2 of the 2008 edition);

---Added the limit requirements for toxic and hazardous substances (see 3.3);

---The determination method of free acid has been added (see 4.5.1);

---Modified packaging specifications (see 7.1, 7.1 of the 2008 edition).

1 Scope

This standard specifies the technical requirements, sampling, test methods, inspection rules, identification and quality certificates, packaging, transportation and storage of heavy superphosphate.

This standard applies to powdered and granular heavy superphosphate for fertilizers made from wet or thermal phosphoric acid treatment of phosphate rock powder.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document.

GB/T 6003.1 Technical Requirements and Inspection of Test Sieve Part 1: Metal Wire Woven Mesh Test Sieve

GB/T 6679 General Rules for Sampling of Solid Chemical Products

GB/T 8170 Numerical rounding rules and the expression and determination of limit values

GB/T 8569 Solid chemical fertilizer packaging

GB 18382 Fertilizer labeling content and requirements

GB 38400 Limit requirements for toxic and hazardous substances in fertilizers

HG/T 2843 Commonly used standard titration solution, standard solution, reagent solution and indicator solution for chemical analysis of fertilizer products

3 Technical requirements