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Chemical analysis of zirconia refractories-Part 2: Determination of zirconia oxide-EDTA volumetric method
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Basic data
| Standard ID | YB/T 4078.2-2003 (YB/T4078.2-2003) |
| Description (Translated English) | Chemical analysis of zirconia refractories-Part 2: Determination of zirconia oxide-EDTA volumetric method |
| Sector / Industry | Ferrous Metallurgy Industry Standard (Recommended) |
| Classification of Chinese Standard | Q44 |
| Classification of International Standard | 81.08 |
| Word Count Estimation | 7,762 |
| Date of Issue | 3/18/2003 |
| Date of Implementation | 6/1/2003 |
| Older Standard (superseded by this standard) | YB/T 4078-1991 |
| Regulation (derived from) | Development & Reform Commission Notice 2008 No. 9 |
YB/T 4078.2-2003: Chemical analysis of zirconia refractories-Part 2: Determination of zirconia oxide-EDTA volumetric method
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Chemical analysis of zirconia refractories-Part 2. Determination of zirconia oxide-EDTA volumetric method
ICS 81.080
Q44
Black metallurgical industry standard
Replace YB/T 4078-1991
Zirconia refractory chemical analysis method
Part 2. EDTA Volumetric Method
Determination of the amount of zirconia
Released on.2003-03-18
2003-06-01 implementation
National Economic and Trade Commission released
Foreword
YB/T 4078 "Chemical Analysis Method for Zirconia Refractories" is divided into the following two parts.
--- Part 1. Determination of zirconia (铪) by gravimetric method.
--- Part 2. Determination of the amount of zirconia (铪) by the EDTA volumetric method.
This part is the second part of YB/T 4078-2003, which is a new method for determining the amount of zirconia (铪) by the EDTA volumetric method.
This part is proposed and managed by the National Technical Committee for Refractory Standardization (CSBTS/T C193).
This section drafted by. Luoyang Refractory Materials Research Institute, Qingdao Shuangying Refractory Materials Co., Ltd.
The main drafters of this section. Liang Xianlei, Guo Qiuhong, Xu Wenxiang.
Zirconia refractory chemical analysis method
Part 2. Determination of zirconia (铪) by EDTA volumetric method
1 Scope
This section specifies the method for determining the amount of zirconia (铪) by the EDTA volumetric method.
This section applies to the determination of the amount of zirconia (yttrium) in zirconia refractories. The measurement range (mass fraction) is 50.00% to 95.00%.
2 Normative references
The terms in the following documents become the terms of this section by reference in this section. All dated references, followed by all
Modifications (not including errata content) or revisions do not apply to this section, however, parties to agreements based on this section are encouraged to study
Is it possible to use the latest version of these files? For undated references, the latest edition applies to this section.
Methods of chemical analysis of zirconia refractory materials - Part 1 . s
(铪) quantity
GB/T 8170 numerical rounding rules
GB/T 10325 Forming and Accepting Rules for Shaped Refractory Products
GB/T 12805 laboratory glass instrument burette
GB/T 12806 laboratory glass instrument single standard line volumetric flask
GB/T 12808 laboratory glass instrument single standard line pipette
GB/T 17617 Sampling of refractory raw materials and unshaped refractory materials
3 Principle
The sample is melted with a sodium carbonate-boric acid mixed flux, dilute with hydrochloric acid, zirconium is introduced into the solution as zirconium oxychloride, and xylenol orange is used as an indicator.
From 1.0mol/L to 1.2mol/L hydrochloric acid, at the near boiling temperature, titrate with EDTA standard titration solution until the test solution changes from purple to stable
The fixed yellow is the end point.
4 reagents
4.1 Mixing flux. Take 2 parts of anhydrous sodium carbonate and 1 part of boric acid, and mix.
4.2 Hydrochloric acid (ρ 1.19 g/mL).
4.3 Zirconium oxide reference solution (0.01mol/L). 0.3081g was weighed and burned at 1000°C～1100°C for 1h and dried in a desiccator.
Zirconium oxide (99.99%) cooled to room temperature, equally divided into 3 platinum crucibles containing 4 g of mixed flux (4.1), mixed, and covered with 1 g
Mix the flux (4.1), cover the lid and leave a gap, place it in a high temperature furnace at 800 °C ~ 900 °C, gradually increase the temperature to 1000 °C ~ 1100 °C,
After melting for 30 minutes, it was taken out, and the crucible was rotated to uniformly adhere the melt to the inner wall of the crucible and cooled. Put 3 oysters in turn to boil
In a 250 mL beaker of 25 mL of hydrochloric acid (4.2) and 50 mL of water, the molten material was heated to leaching to clear the solution, and the crucible and the lid were washed with water and cooled to
At room temperature, transfer to a 250 mL volumetric flask (5.3), dilute to the mark with water, and shake well.
4.4 EDTA standard titration solution [犮 (EDTA) = 0.015 mol/L].
4.4.1 Preparation.
Weigh 5.58g EDTA (disodium edetate) in a 250mL beaker, stir with water and dissolve it (slightly heated if necessary)
Dilute to 1000 mL with water and mix.
4.4.2 Calibration.
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