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GB/T 7737-2007 English PDF (GBT7737-2007)

GB/T 7737-2007 English PDF (GBT7737-2007)

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GB/T 7737-2007: Ferroniobium

This Standard specifies technical requirements, test methods, inspection rules, packaging, storage, marks and quality certificate of ferroniobium. This Standard is applicable to ferroniobium that is made from niobium pentoxide and niobium concentrate and is used for steelmaking or casting as an additive, for electrode as alloying agent, magnetic material.
GB/T 7737-2007
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.100
H 42
Replacing GB/T 7737-1997
Ferroniobium
ISSUED ON: SEPTEMBER 11, 2007
IMPLEMENTED ON: FEBRUARY 01, 2008
Issued by: General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Technical requirements ... 5
4 Test methods ... 6
5 Inspection rules ... 7
6 Packaging, storage, marks and quality certificate ... 8
Annex A (informative) Determination of arsenic, antimony, lead, tin, bismuth and manganese in ferroniobium ... 9
Ferroniobium
1 Scope
This Standard specifies technical requirements, test methods, inspection rules, packaging, storage, marks and quality certificate of ferroniobium.
This Standard is applicable to ferroniobium that is made from niobium pentoxide and niobium concentrate and is used for steelmaking or casting as an additive, for electrode as alloying agent, magnetic material.
2 Normative references
The provisions in following documents become the provisions of this Standard through reference in this Standard. For dated references, the subsequent amendments (excluding corrigendum) or revisions do not apply to this Standard, however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies. GB/ T 3650, The general rules for inspection packing storing transportation marking and certification of ferroalloy
GB/T 3654.1, Methods for chemical analysis of ferroniobium. The paper
chromatographic gravimetric method for the determination of niobium and tantalum content
GB/T 3654.3, Ferroniobium - Determination of silicon content - Gravimetric method
GB/T 3654.4, Methods for chemical analysis of ferroniobium. The
combustion gravimetric method for the determination of carbon content
GB/ T 3654.5, Methods for chemical analysis of ferroniobium. The
molybdenum blue photometric method for the determination of the
phosphorus content
GB/T 3654.6, Ferroniobium - Determination of sulfur content - Combustion- iodate titrimetric method, methylene blue photometric method and infrared absorption method
GB/T 3654.7, Methods for chemical analysis of ferroniobium - The methylene blue photometric method for the determination of sulfur content
Annex A
(informative)
Determination of arsenic, antimony, lead, tin, bismuth and manganese in ferroniobium - Inductively coupled plasma emission spectroscopy
A.1 Scope
This annex specifies the method that uses inductively coupled plasma emission spectroscopy to determine arsenic, antimony, lead, tin, bismuth, manganese in ferroniobium.
This Annex is applicable to the determination of arsenic, antimony, lead, tin, bismuth, manganese in ferroniobium. Determination range: the mass fraction of arsenic, antimony, lead, tin, bismuth is 0.001%~1.0%; the mass fraction of manganese is from 0.001%~2.0%.
A.2 Method summary
Use hydrofluoric acid and nitric acid to decompose the sample and dilute to a certain volume. Through matrix matching, eliminate spectral interference. Introduce atomized solution into the inductively coupled plasma emission spectrometer. Determine the luminous intensity values of arsenic, antimony, lead, tin, bismuth, manganese and other elemental analysis lines. Determine the mass fraction of the corresponding element by the working curve method. A.3 Reagents and materials
A.3.1 Hydrofluoric acid (G.R) grade.
A.3.2 Nitric acid (G.R) grade.
A.3.3 Nitric acid 4mol/L (G.R) grade.
A.3.4 Hydrochloric acid (G.R) grade.
A.3.5 Hydrochloric acid 4mol/L (G.R) grade.
A.3.6 Ferroniobium matrix (mass fractions of arsenic, antimony, lead, tin, bismuth, and manganese are all less than 0.0001%).
A.3.7 Arsenic standard solution 1000??g/mL: Weigh 1.3203g of spectrally-pure As2O3. Place in a 250mL beaker. Add 150mL of hydrochloric acid (A.3.5). Slightly heat to dissolve. Move into a 1000mL volumetric flask. Use pure water to dilute to the scale. Mix well.
volumetric flask. Add 1mL of nitric acid (A.3.2), 1mL of hydrochloric acid (A.3.4). Use pure water to dilute to the scale. Mix well.
1mL of this solution contains 10??g of arsenic, antimony, lead, tin, bismuth and manganese, respectively.
A.4 Instruments and equipment
A.4.1 Inductively coupled plasma emission spectrometer (ICP-AES, equipped with hydrofluoric acid resistant injection system).
A.4.2 50mL Teflon beaker.
A.4.3 50mL Teflon volumetric flask.
A.4.4 Heating plate.
A.4.5 Analytical balance (1 in 10000).
A.5 Analysis steps
A.5.1 Preparation of standard and blank test solutions
Use the analytical balance (A.4.5) to weigh 5 portions of ferroniobium matrix (A.3.6), 0.30g for each portion (to the nearest of 0.0001g). Place in a 50mL Teflon beaker. Respectively add 2mL of pure water, 2mL of hydrofluoric acid (A.3.1), 1mL of nitric acid (A.3.2). Place on the heating plate. Heat till the sample is completely dissolved. Remove to cool. The 4 portions are added into the standard solution according to the following requirements as standard solution 1, standard solution 2, standard solution 3 and standard solution 4. Add 0.30mL of arsenic, antimony, lead, tin, bismuth and manganese mixed standard solution (A.3.14) into standard solution 1. Add 0.30mL of arsenic, antimony, lead, tin, bismuth, manganese mixed standard solution (A.3.13) into standard solution 2. Add 0.30mL of arsenic standard solution (A.3.7), antimony standard solution (A.3.8), lead standard solution (A.3.9), tin standard solution (A.3.10), bismuth standard solution (A.3.11) respectively, 0.60mL of manganese standard
solution (A.3.12) into standard solution 3. Add 3.00mL of arsenic standard solution (A.3.7), antimony standard solution (A.3.8), lead standard solution (A.3.9), tin standard solution (A.3.10), bismuth standard solution (A.3.11) respectively, 6.00mLof manganese standard solution (A.3.12) into standard solution 4. Respectively move the above 4 solutions into 50mL PTFE volumetric flasks. Use pure water to dilute to the scale. Mix well for testing. Move the rest one portion into a 50mL Teflon volumetric flask. Use pure water to dilute to the scale. Mix well as the blank test solution.
A.5.2 Preparation of test sample solution
Use the analytical balance (A.4.5) to weigh 0.30g of ferroniobium test material

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