GB/T 24586-2009Iron ores - Determination of apparent density, true density and porosity (English PDF)
铁矿石 表观密度、真密度和孔隙率的测定
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
October 30, 2009
Implementation date
May 1, 2010
Scope
GB/T 24586-2009 is the English-translated version of 铁矿石 表观密度、真密度和孔隙率的测定.
GB/T 24586-2009 sets out the methods for determining the apparent density, true density and porosity of iron ores.
Clause 1 states that it applies to those determinations on pelletized iron ores, and a warning adds that users must have practical experience of formal laboratory work, that the standard does not point out all possible safety issues, and that the user is responsible for adopting appropriate safety and health measures.
Its contents list names Scope, Normative references, Apparent density, True density, Result expression and Test report, with Appendix A (informative) giving schematic diagrams of the test equipment and instrument structure, Appendix B (normative) the density of distilled water at different temperatures, Appendix C (informative) the derivation of the working equation of the true density meter, and Appendix D (normative) the flow chart for the acceptance inspection of sample analysis values.
Clause 3 obtains the apparent density by letting water penetrate the pores of the pellets and weighing them in air and immersed in distilled water in a test basket: the basket is shaken free of bubbles and left to stand for 20 min, the pellets are then blotted individually between absorbent sponges and reweighed, the empty basket is weighed in water, the water temperature is measured and the corresponding density of distilled water read from Appendix B, and the result in g/cm3 is calculated from those masses with formula (1).
Clause 4 obtains the true density from gas pressure measurements: the sample is added to a container of known volume, which is sealed and charged with a certain amount of helium, and pressure sensors measure the pressure in the container and then the equilibrium reached when the gas is diffused into a second container of known pressure and volume.
The normative references are GB/T 8170 on rounding and the expression and judgement of limiting values, GB/T 10122 on sampling and sample preparation of iron ore sinter and pellets for physical testing, and GB/T 10322.1 on iron ore sampling and sample preparation procedures. It was issued on 30 October 2009 and has applied since 1 May 2010.
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Document preview — GB/T 24586-2009
National Standard of the People's Republic of China
- ICS
- 73.060.10
- Classification
- D 31
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope4
- 2 Normative References4
- 3 Apparent Density4
- 4 True Density6
- 5 Result Expression7
- 6 Test Report8
- Appendix A (informative) Schematic Diagram of Test Equipment and Instrument Structure9
- Appendix B (normative) Density of Distilled Water at Different Temperatures12
- Appendix C (informative) Derivation of Working Equation of True Density Meter13
- Appendix D (normative) Flow Chart of Acceptance Inspection of Sample Analysis Value15
1 Scope
This Standard specifies the determination method of apparent density, true density and porosity of iron ores.
This Standard is applicable to the determination of apparent density, true density and porosity of pelletized iron ores.
2 Normative References
Through the reference in this Standard, the clauses of the following documents become clauses of this Standard. In terms of references with a specified date, all the subsequent modification sheets (excluding the corrected content) or revised versions are not applicable to this Standard. However, the various parties that reach an agreement in accordance with this Standard are encouraged to explore the possibility of adopting the latest version of these documents. In terms of references without a specified date, the latest version is applicable to this Standard.
GB/T 8170 Rules of Rounding off for Numerical Values & Expression and Judgement of Limiting Values
GB/T 10122 Iron Ores (sinter and pellets) - Sampling and Sample Preparation for Physical Testing
GB/T 10322.1 Iron Ores - Sampling and Sample Preparation Procedures (GB/T 10322.1-2000, idt ISO 3082:1998)
3 Apparent Density
3.1 Principle
After immersing water into the pores of the pelletized iron ores, respectively weigh the […]
3.5
3.5.2 Place the sample into the test basket; immerse the test basket that contains the sample into distilled water; shake the test basket to remove bubbles. After placing it still for 20 min, record the sum of the mass of the sample and the test basket as m2, see Figure A.3 in Appendix A.
3.5.3 Remove the pelletized iron ores from the distilled water; place them independently of each other in a pair of absorbent sponges (3.3.2). Then, use hands to gently squeeze the sponge, so as to absorb the distilled water attached to the test sample. Weigh and record its mass as m3.
NOTE: use fresh surface of gauze.
3.5.4 Re-immerse an empty test basket into water; record the mass of the test basket in water as m4.
3.5.5 Measure the temperature of water in the container. Use the table in Appendix B to obtain the density of distilled water at this temperature.
3.6 Calculation of Apparent Density
Use Formula (1) to calculate the apparent density rhoa of the test sample.
Where, rhoa---apparent density, expressed in (g/cm3); m1---mass of sample in the air, expressed in (g); m2---sum of mass of sample and test basket in water, expressed in (g); m3---mass of web bulb in the air, expressed in (g); m4---mass of test basket in water, expressed in (g); rho1---density of distilled water at test temperature, expressed in (g/cm3).
4 True Density
4.1 Principle
Add the sample into a container of already-known volume. Seal the container, then, inlet a certain amount of helium gas. Use a pressure sensor to measure the pressure in the container, then, diffuse the gas in the container to another container of already-known pressure and volume. Use a pressure sensor to measure the equilibrium […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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Related Standards
GB/T 10322.1-2023 — Iron ores - Sampling and sample preparation procedures
GB/T 8170-2008 — Rules of rounding off for numerical values & expression and judgement of limiting values
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