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This standard is developed in accordance with the rules given in GB/T 1.1-2020 Directives for standardization — Part 1: Rules for the structure and drafting of standardizing documents.
This standard replaces GB/T 1918-2011 Potassium nitrate for industrial use. In addition to structural adjustments and editorial changes, the following main technical changes have been made with respect to GB/T 1918-2011:
——The scope has been modified (see Clause 1 herein; Clause 1 of Edition 2011);
——The classification has been added (see Clause 5);
——The grade has been canceled (see 6.2 herein; 4.2 of Edition 2011);
——The indexes of ammonium salt and metal ions have been added, and the index requirements have been set according to the classification (see 6.2 herein; 4.2 of Edition 2011);
——The determination method for iron content has been modified (see 7.12 herein; 5.11 of Edition 2011);
——The visual colorimetric method for ammonium salt content determination has been added (see 7.9.2 herein; 5.12 of Edition 2011);
——The determination method for shatter value has been added (see 7.11).
——The determination method of metal ion content has been added (see 7.12).
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this standard shall not be held responsible for identifying any or all such patent rights.
This standard was proposed by China Petroleum and Chemical Industry Federation.
This standard is under the jurisdiction of Subcommittee on Inorganic Chemical Industry of National Technical Committee on Chemical of Standardization Administration of China (SAC/TC 63/SC 1).
The previous editions of this document and documents replaced by this document are as follows:
——This document was first issued as GB 1918-1980 in 1980, and revised for the first time in 1986, for the second time in 1998 and for the third time in 2011;
——This edition is the fourth revision.
Potassium nitrate for industrial use
WARNING: According to GB 12268-2012, Clause 6, this product belongs to Category 5 Item 5.1 oxidizing substance, and shall be operated with caution. Persons using this standard shall be familiar with normal laboratory practice. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user to adopt appropriate safety and health measures and to ensure compliance with any national regulatory conditions.
1 Scope
This document specifies the product classification, requirements, test methods, inspection rules, marking and labeling, packaging, transportation and storage of potassium nitrate for industrial use.
This document is applicable to potassium nitrate for industrial use.
Note: This product is mainly used in fused salt, black powder, fuse, pharmaceutical intermediates, optical glass, ammonia catalyst, metal heat treatment, enamel and other industries.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this standard and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 191-2000 Packaging — Pictorial marking for handling of goods
GB/T 3051-2000 Inorganic chemical products for industrial use — General method for determination of chloride content — Mercurimetric method
GB/T 3600-2000 Fertilizers — Determination of ammoniacal nitrogen content — Formaldehyde method
GB/T 6678 General rules for sampling liquid chemical products
GB/T 6682-2008 Water for analytical laboratory use — Specification and test methods
GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values
GB/T 23945-2009 Inorganic chemicals for industrial use — General method for the determination of chloride content — Visible turbidimetric method
HG/T 3696.1 Inorganic chemicals for industrial use — Preparations of standard and reagent solutions for chemical analysis — Part 1: Preparations of standard volumetric solutions
HG/T 3696.2 Preparation of standard solutions, preparations and products for chemical analysis of inorganic chemical products — Part 2: Preparation of impurity standard solutions
HG/T 3696.3 Preparation of standard solutions, preparations and products for chemical analysis of inorganic chemical products — Part 3: Preparation of preparations and products
JT/T 617 (all parts) Regulations concerning road transportation of dangerous goods
3 Terms and definitions
No terms and definitions are listed in this standard.
4 Molecular formula and relative molecular mass
Molecular formula: KNO3
Relative molecular mass: 101.10 (according to international relative atomic mass in 2018)
5 Classification
Potassium nitrate for industrial use is classified into three categories, with the following main applications:
——Category I products are mainly used for producing fused salt;
——Category II products are classified into two types, of which Type I products are mainly used for producing black powder, fuse, pharmaceutical intermediates and glass clarifier, etc., and Type II products are mainly used for metal heat treatment, producing enamel glaze, etc.
——Category III products are products with inorganic salts anti-caking agents, which are mainly used as fluxing agents for glass and ceramics.
6 Requirements
6.1 Appearance: Potassium nitrate for industrial use is white crystal or spherical particles.
6.2 The test method of potassium nitrate for industrial use as specified in this document shall meet those specified in Table 1.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Molecular formula and relative molecular mass
5 Classification
6 Requirements
7 Test method
8 Inspection rules
9 Marking and labeling
10 Packaging, transportation and storage
Annex A (Informative) Common spectral lines and detection limits of ICP-OES
Bibliography
