GB/T 2945-2017 in English

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This standard is developed in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 2945－1989 Ammonium nitrate in whole. The following technical changes have been made with respect to GB/T 2945－1989:

--The warnings, surface quality of crystalline ammonium nitrate (see 3.1.1), sampling of bulk product (see 5.3.2), determination of products qualified index (see 5.5.1), and requirements of transportation (see 6.3) is added;

--Determination method (reduction-distillation-titration) of ammonium nitrate content is added, ammonium nitrate content is calculated as the referee method through the determination of total nitrogen;

--Normative references (see chapter 2), grade of ammonium nitrate for agricultural products and technical index (see chapter 4), marking and dimension of packaging (see 7.1, 7.2 and 7.4) is modified.

This standard was proposed by China Petroleum and Chemical Industry Association.

This standard is under jurisdiction of SAC/TC 105/SC 2 National Technical Committee on Fertilizer and Soil Conditioner of Standardization Administration of China.

The previous editions of the standard replaced by this standard are as follows:
--GB/T 2945－1989.

 
Introduction
 

Ammonium Nitrate

Warning--This standard does not address all of the safety concerns. The user is obliged to take appropriate safety precautions and guarantee the compliance of relevant national laws and regulations. Ammonium nitrate, as an oxidant, is helpful to combust when a flammable object catches fire; may explode fiercely with a mixture of combustible powder, intense vibration, and rapid heating; can form an explosive mixture with reductant, organic matter and combustible; irritants to respiratory tract, eye and skin.

1 Scope

This standard specifies the requirements, test methods, inspection rules, marking, packaging, transportation, storage and safety of ammonium nitrate.

This standard is applicable to ammonium nitrate neutralized with ammonia and nitric acid.

2 Normative References

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB 190 Packing symbol of dangerous goods
GB/T 191 Packaging-Pictorial marking for handling of goods
GB/T 2947 Determination of free water in urea and ammonium nitrate by Karl Fischer method
GB/T 3600 Fertilizers-Determination of ammoniacal nitrogen content-Formaldehyde method
GB/T 6003.1 Test sieves-Technical requirements and testing-Part 1:test sieves of metal wire cloth
GB/T 6679 General rules for sampling solid chemical products
GB/T 6682 Water for analytical laboratory use-Specification and test methods
GB/T 8170－2008 Rules of rounding off for numerical values & expression and judgement of limiting values
GB/T8572－2010 Determination of total nitrogen content for compound fertilizers titrimetric method after distillation
GB/T8577 Determination of free water for compound fertilizers-Karl Fischer method
HG/T 2843 Chemical fertilizer products-standard volumetric, standard, reagent and indicator solutions for chemical analysis
JT 617 The regulation of automobile transportation of dangerous goods

“Transportation of Dangerous Goods Code” -- Ministry of Railways of the People's Republic of China

3 Molecular formula and molecular weight

Molecular formula: NH4NO3
Molecular weight: 80.04 (according to international relative atomic mass in 2011)

4 Requirements

4.1 Crystalline ammonium nitrate

4.1.1 Appearance: without mechanical impurity by visual inspection.

4.1.2 It shall be in accordance with both the requirements given in Table 1 and Table 2 respectively, and the values indicated on packaging container.

Table 1 Requirements of Crystalline Ammonium Nitrate (Industrial)
Items Indicators
Superior quality product First grade product
The mass fraction of ammonium nitrate
(by dry basis)/% ≥ 99.5
The mass fraction of free water, a/% ≤ 0.3 0.5
Acidity Methyl orange indicator doesn't appear red
Mass fraction of ignition residue/% at most 0.05
a Qualification evaluation of the mass fraction of free water is subject to the delivery inspection results.

Table 2 Requirements of Crystalline Ammonium Nitrate (Agricultural)
Items Indicators
The mass fraction of total nitrogen/% at least 34.0
The mass fraction of free water, a/% at most 0.7
Acidity Methyl orange indicator doesn't appear red
a Qualification evaluation of the mass fraction of free water is subject to the delivery inspection results.


4.2 Granular ammonium nitrate

4.2.1 Appearance: white or light-colored granule without visible mechanical impurity.

4.2.2 It shall be in accordance with not only the requirements given in Table 3 and Table 4 respectively, but also the marked contents on packaging container.

Table 3 Requirements of Granular Ammonium Nitrate (Industrial)
Items Indicators
Superior quality product First grade product Qualified product
The mass fraction of ammonium nitrate (by dry basis)/% at least 99.5
The mass fraction of free water, a/% at most 0.6 1.0 1.2
PH value of 10% water solution at least 5.0 4.0
Mass fraction of insoluble residue in 10% nitric acid solution/% at most 0.2
Average crushing strength of granule, b/(N/granule) at least 5
Granularity (1.00 mm～2.80 mm)/% at least 85
a Qualification evaluation of the mass fraction of free water is subject to the delivery inspection results.

b Average crushing strength of granule is the index in customer agreement.

Table 4 Requirements of Granular Ammonium Nitrate (Agricultural)
Items Indicators
Superior quality product Qualified product
The mass fraction of total nitrogen/% at least 34.0 33.5
The mass fraction of free water, a/% at most 0.6 1.5
PH value of 10% water solution at least 5.0 4.0
The mass fraction of the anti-caking additive
(in calcium oxide)/% 0.2~0.5 －
Loose degree, b /% at least 80 －
Average crushing strength of granule, a/(N/granule) at least 5
Granularity (1.00 mm～2.80 mm)/% at least 85
a Qualification evaluation of the mass fraction of free water is subject to the delivery inspection results.

b Qualification evaluation of loose degree is subject to the delivery inspection results.

c Average crushing strength of granule is the index in customer agreement.

5　　Test method

Unless otherwise specified, analytical reagents and Class-3 water shall be adopted for the purpose of this standard. The standard titration solution and indicator in this standard shall be formulated in accordance with those specified in HG/T 2843 when it is without specified dimension and preparation method.

In addition to the pH value, the granularity, the average crushing strength and loose degree, the parallel determination of two granular samples shall be made.

Foreword i
Introduction ii
1 Scope
2 Normative References
3 Molecular formula and molecular weight
4 Requirements
5　　Test method
6 Test rules
7 Marking, Packaging, Transport and Storage
8 Safety Requirements