YS/T 575.20-2021 English PDF (YST575.20-2021)

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YS/T 575.20-2021: Methods for chemical analysis of bauxite - Part 20: Preparation of pre-dried sample
YS/T 575.20-2021
YS
NONFERROUS MEAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 71.040.40
CCS H 30
Replacing YS/T 575.20-2007
Methods for chemical analysis of bauxite - Part 20:
Preparation of pre-dried sample
ISSUED ON: MARCH 05, 2021
IMPLEMENTED ON: JULY 01, 2021
Issued by: Ministry of Industry and Information Technology
Table of Contents
Foreword ... 3
Introduction ... 6
1 Scope ... 7
2 Normative references ... 7
3 Terms and definitions ... 7
4 Principle ... 7
5 Instruments and equipment ... 7
6 Specimen ... 8
7 Test steps ... 8
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
5.1 Dryer: Contains activated alumina (heated at 300 °C ± 10 °C for activation for 5 h
before use) or color-changing silica gel (heated at 120 °C ± 5 °C for regeneration for 4
h before use).
5.2 Oven: The temperature can be controlled at 110 °C ± 5 °C; the air flow is guaranteed
in the oven.
5.3 Analytical balance: The actual graduation value is 0.0001 g.
5.4 Weighing bottle: It has lid and large enough to hold the required specimen amount.