GB/T 6609.24-2026Chemical analysis and physical property determination methods for alumina - Part 24: Measurement of the angle of repose and the angle of flow (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part

1.Structure and Drafting Rules of Standardization Documents". Drafting. This document is Part 24 of GB/T 6609, "Chemical Analysis Methods and Physical Property Determination Methods for Alumina". GB/T 6609 has been... The following sections were published.

1.Determination of Trace Element Content by Inductively Coupled Plasma Atomic Emission Spectrometry;

2.Determination of mass loss at 300°C and 1000°C;

---Determination of silica content by molybdenum blue spectrophotometry;

---Determination of ferric oxide content by o-phenanthroline spectrophotometry;

5.Determination of sodium oxide and potassium oxide content;

7.Determination of the content of titanium dioxide, chromium trioxide, copper oxide, fluorine, chlorine, boron trioxide, phosphorus pentoxide, and sulfate. Fixed-point spectrophotometry;

---Determination of vanadium pentoxide content by benzoylphenylhydroxylamine extraction spectrophotometry;

11.Determination of Manganese Monoxide and Magnesium Oxide Content by Flame Atomic Absorption Spectrometry;

12.Determination of Zinc Oxide Content by Flame Atomic Absorption Spectrometry;

13.Determination of Calcium Oxide Content by Flame Atomic Absorption Spectrometry;

19.Determination of Lithium Oxide Content by Flame Atomic Absorption Spectrometry;

---Determination of gallium trioxide content by butylrhodamine B spectrophotometry;

5 Instruments and Equipment

5.1 Stainless steel funnel. inner diameter is 74mm, inner diameter of discharge port is 6mm, and a sieve with a 1mm aperture is installed between the two baffles.

5.2 Base plate. Made of steel (or corrosion-resistant materials such as marble), minimum dimensions. length 270mm, width.200mm, thickness [not specified]. 18mm. Four straight lines at 45° angles to each other are engraved on the polished, electroplated base surface. A locating pin is located below the center of the stainless steel funnel. The base plate has adjustable leveling feet.

5.3 Funnel Holder. Made of stainless steel, its structure should be robust. The centerline of the funnel is perpendicular to the center locating pin.

5.4 Height gauge. A polished cylinder made of stainless steel, 40mm high, with a locating pin at the bottom to engage with the base plate. Groove.

5.5 Flat-bottomed container. inner diameter 72.5mm ± 0.1mm, inner height 72.5mm ± 0.1mm, and vent diameter 4mm ± 0.1mm. The thickness of the leak's wall and root is 4.5mm ± 0.1mm, and the theoretical volume of the container is 300mL. The inner wall of the container is smooth, and the surface is flat. It reaches the level of machining and does not stick to the sample.

5.6 Balance. Scale division value is 0.1g.

6 Samples

Sampling shall be carried out in accordance with the provisions of Chapter 6 of GB/T 6609.22-2026, and sample preparation shall be carried out in accordance with Section

7.3 of GB/T 6609.22-2026. The regulations shall be followed.

7 Determination of the Angle of Repose

7.1 Parallel Tests Perform two parallel experiments and take the average value.

9 Precision

9.1 Repeatability (r) The absolute difference between two independent test results obtained under repeatability conditions, within the measurement range. The value should not exceed 1°, and cases exceeding 1° should not exceed 5%; the absolute difference between two flow angle test results should not exceed 1.5°, and cases exceeding 1.5° should not exceed 5%. More than 5%.

9.2 Reproducibility (R) The absolute difference between two independent test results obtained under reproducibility conditions, within the measurement range. The value should not exceed 2°, and cases exceeding 2° should not exceed 5%; the absolute difference between two flow angle test results should not exceed 3.0°, and cases exceeding 3.0° should not be... More than 5%.

10 Test Report The test report should include the following items.

a) Test subjects;

b) Measurement items;

c) This document number;

d) Analytical results and their representation;

e) Differences from basic experimental procedures;

f) Observed anomalies;