GB/T 6730.68-2009 PDF in English

GB/T 6730.68-2009 (GB/T6730.68-2009, GBT 6730.68-2009, GBT6730.68-2009)
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GB/T 6730.68-2009110 Add to Cart Auto, < 3 mins Iron ores -- Determination of loss on ignition -- Gravimetric method Valid

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GB/T6730.68-2009 (GBT6730.68-2009): PDF in English

GB/T 6730.68-2009
ICS 73.060.10
D 31
Iron ores - Determination of loss on ignition -
Gravimetric method
Issued by: General Administration of Quality Supervision, Inspection and
Standardization Administration of the People's Republic of
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 5 
4 Principle ... 5 
5 Reagents and materials ... 5 
6 Equipment ... 5 
7 Sampling and sample preparation ... 5 
8 Analysis steps ... 6 
9 Result calculation ... 6 
10 Precision ... 7 
11 Test report ... 7 
Iron ores - Determination of loss on ignition -
Gravimetric method
WARNING - Persons using this Part of GB/T 6730 shall have experience
in formal laboratory work. This Part does not address all security issues.
It is the user's responsibility to take appropriate safety and health
measures and to ensure compliance with the conditions stipulated by
relevant national regulations.
1 Scope
This Part of GB/T 6730 specifies determination of loss on ignition (LOI) in iron
ore by gravimetric method.
This Part is applicable to determination of ignition loss in natural iron ore, iron
concentrate and sinter. The determination range (mass fraction): -
This Part does not apply to processed minerals containing metallic iron, natural
or processed minerals with a sulfur content greater than 0.2% (mass fraction).
2 Normative references
The following referenced documents are indispensable for the application of
this part of GB/T 6730. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including
any amendments) applies.
GB/T 6379.2, Measurement methods and results - Accuracy (trueness and
precision) - Part 2: Determine the standard methods of measurement
repeatability and reproducibility of the basic method (GB/T 6379.2-2004, ISO
5725-2:1994, IDT)
GB/T 6730.1, Iron ores - Preparation of pre-dried test samples for chemical
analysis (GB/T 6730.1-1986, idt ISO 7764:1985)
GB/T 8170, Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 10322.1, Iron ores - Sampling and sample preparation procedures
(GB/T 10322.1-2000, idt ISO 3082:1998)
GB/T 20565, Iron ores and direct reduced iron - Vocabulary (GB/T 20565-
2006, ISO 11323:2002, IDT)
3 Terms and definitions
The terms and definitions defined in GB/T 20565 apply to this Part.
4 Principle
The test material is ignited to constant weight at 1000°C±25°C. Calculate the
ignition loss based on the mass lost.
5 Reagents and materials
Unless otherwise stated, only the confirmed analytically-pure reagents are used
in the analysis.
5.1 Silica gel, dried at 105°C for 4h.
6 Equipment
Laboratory routine equipment includes:
6.1 Porcelain crucible or platinum crucible: capacity is 15mL~25mL.
6.2 Balance: the sensitivity is 0.1mg.
6.3 High temperature furnace: the maximum operating temperature is not less
than 1100°C, and can automatically control the temperature.
7 Sampling and sample preparation
7.1 Laboratory sample
Samples for analysis shall be sampled and prepared according to GB/T
10322.1. Generally, the particle size of the specimen shall be less than 100μm.
If the specimen has obvious burn loss (more than 2.0%), its particle size shall
be less than 160μm.
7.2 Preparation of pre-dried specimens
Mix the laboratory samples well. Use the increment method to sample.
According to the provisions of GB/T 6730.1, the sample is dried at a
temperature of 105°C±2°C.