YS/T 63.23-2012Carbonaceous materials used in the production of aluminium. Part 23: Baked anodes. Determination of the reactivity to air. Thermogravimetric method (English PDF)

Foreword

YS/T 63 "Carbonaceous material for aluminum," a total of 26 parts.

--- Part 1. firing process, firing weightlessness measurement sample measurement cathode paste and green specimens apparent density;

--- Part 2. Determination of cathode blocks and prebaked anodes room temperature resistivity;

--- Part 3. Determination of the thermal conductivity of Comparative Law;

--- Part 4. Determination of thermal expansion coefficient;

--- Part 5. Determination of pressure at the bottom there is sodium expansion of carbon block;

--- Part 6. Determination of open porosity hydrostatic law;

--- Part 7. Determination of apparent density size method;

--- Part 8. Determination of density in xylene Pyknometer;

--- Part 9. Determination of true density of helium hydrometer method;

--- Part 10. Determination of air permeability;

--- Part 11. Determination of the reactivity to air mass loss method;

--- Part 12. Determination of the reactivity prebaked anode CO2 mass loss method;

--- Part 13. Determination of Young's modulus of the static measurement method;

--- Part 14. Determination of flexural strength of three-point method;

--- Part 15. Determination of compressive strength;

--- Part 16. Determination of Trace Elements in X-ray fluorescence spectrometry method;

--- Part 17. Determination of volatile matter;

--- Part 18. Determination of moisture content;

--- Part 19. Determination of ash content;

--- Part 20. Determination of sulfur;

--- Part 21. cathode paste firing the expansion/contraction of determination;

--- Part 22. Determination of equivalent temperature roasting degree method;

--- Part 23. Determination of the reactivity to air prebaked anode thermal gravimetry;

--- Part 24. Determination of the reactivity prebaked anode carbon dioxide thermal gravimetry;

--- Part 25. Determination of no pressure sodium expansion of the bottom of the carbon block;

--- Part 26. Determination of refractories cryolite penetration ability.

This is Part 23.

This section drafted in accordance with GB/T 1.1-2009 given rules.

This section is non-arbitration.

This section uses the translation method identical with ISO 12989.2:2004 "carbonaceous materials used in the production of aluminum and prebaked anode carbon block air side Determination of reactivity - Part 2 thermal gravimetry. " This part of ISO 12989.2:2004 made the following editorial changes.

--- Removed 12989.2.2004 directory, foreword, introduction, and references;

--- Standard name in accordance with the requirements of the standard in this series have been modified;

The non-ferrous metal part by the National Standardization Technical Committee (SAC/TC243) centralized.

This section is responsible for drafting units. Aluminum Corporation of China Zhengzhou Research Institute, China Nonferrous Metals Industry Standards and Metrology Institute for Quality.

Participated in the drafting of this section. Shandong Chenyang Carbon Co., Ltd., Shandong Nanshan Aluminum Co., Ltd.

1 Scope

YS/T of the provisions of section 63 of the method of thermogravimetric (TGA) was measured prebaked anode reactivity to air.

This section applies to the determination of prebaked anode air reactivity thermogravimetric (TGA). Since the heating conditions, the sample size, material, quality measurement Too many losses and subsequent reaction rate of the diversity of available devices. This section provides the sample size, reaction temperature, surface gas flow Degree and reaction time, so that the results of different devices measured are comparable.

2 Terms and definitions

The following terms and definitions apply to this document.

Off rate airdustingratealphad.

During the test, the unit area per unit time from the falling amount of charcoal dust.

End stage air reactivity finalairreactivityalphaf.

The carbon block, the reaction chamber is exposed to the air atmosphere last 30min, the sample mass loss ratio of the original surface area.

Note. milligrams per square centimeter per hour (mg/(cm2 · h)).

The initial phase of the reactivity to air initialairreactivityalphai.

The carbon block, the reaction chamber is exposed to an air atmosphere during the first 30min, the sample mass loss ratio of the original surface area.

Note. milligrams per square centimeter per hour (mg/(cm2 · h)).

The overall reaction of the air totalairreactivityalphaT.

Charcoal in the reaction chamber is exposed to an air atmosphere within the total time 180min, loss of quality (including dust and amount) with the original specimen surface area Ratio.

Note. milligrams per square centimeter per hour (mg/(cm2 · h)).

3 PRINCIPLE OF THE METHOD

Cylindrical carbon block surface by a given flow rate of air flow, isothermal reaction conditions and within the specified time, to determine the loss rate, early Initial stage, the end of the stage and the overall reactivity to air. Continuous monitoring by the sample mass loss was measured continuously reactivity. Loss rate by the collector and in measuring the reaction process falling on carbon block carbon particles is determined.

4 Test device

4.1 Air reactive equipment. devices should be as simple as possible. The reaction rate was measured require isothermal conditions, the reaction should not be the instrument