YS/T 575.20-2021Methods for chemical analysis of bauxite - Part 20: Preparation of pre-dried sample (English PDF)

Foreword

This document was drafted in accordance with the provisions of GB/T 1.1-2020

"Directives for standardization - Part 1: Rules for the structure and drafting of

standardizing documents".

This document is Part 20 of YS/T 575 "Methods for chemical analysis of bauxite". YS/T

575 has published the following parts:

- Part 1: Determination of aluminium oxide content EDTA titrimetric method;

- Part 2: Determination of silicon dioxide content - Gravimetric-molybdenum blue

photometric method;

- Part 3: Determination of silicon dioxide content molybdenum blue photometric

method;

- Part 4: Determination of iron oxide content - Dichromate titrimetric method;

- Part 5: Determination of iron oxide content - Orthophenanthroline photometric

method;

- Part 6: Determination of titanium dioxide content - Diantipyrylmethane

photometric method;

- Part 7: Determination of calcium oxide content - Flame atomic absorption

spectrophotometric method;

- Part 8: Determination of magnesium oxide content - Flame atomic absorption

spectrophotometric method;

- Part 9: Determination of potassium oxide and sodium oxide content - Flame atomic

absorption spectrophotometric method;

- Part 10: Determination of manganese oxide content - Flame atomic absorption

spectrophotometric method;

- Part 11: Determination of chromium oxide content - Flame atomic absorption

spectrophotometric method;

- Part 12: Determination of vanadium pentoxide content - N-benzoy-N-

phenylhydroxylamine photometric method;

- Part 13: Determination of zinc content flame - Atomic absorption

spectrophotometric method;

- Part 14: Determination the total content of rare earth oxide - Tribromo-arsenazo

Methods for chemical analysis of bauxite - Part 20:

Preparation of pre-dried sample

1 Scope

This document specifies the preparation method of pre-dried specimen in bauxite.

This document is applicable to the preparation of pre-dried specimen in bauxite; the

dried specimens are mainly used for the determination of chemical composition.

2 Normative references

The contents of the following documents constitute essential clauses of this document

through normative references in the text. Among them, for dated references, only the

version corresponding to that date applies to this document; for undated references, the

latest version (including all amendments) applies to this document.

GB/T 25949 Aluminium ores - Preparation of samples

3 Terms and definitions

There are no terms and definitions that need to be defined in this document.

4 Principle

The specimen is dried in an oven at 110 °C ± 5 °C until the mass remains constant.

5 Instruments and equipment