YS/T 575.17-2007 (YS/T575.17-2007)

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YS/T 575.17-2007: PDF in English (YST 575.17-2007)
YS/T 575.17-2007
GB
NONFERROUS METAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.10
Q 52
Replacing YS/T 575.17-2006
Methods for chemical analysis of bauxite -
Part 17. Determination of sulfur content -
Direct combustion - iodometric method
ISSUED ON. NOVEMBER 14, 2007
IMPLEMENTED ON. MAY 01, 2008
Issued by. National Development and Reform Commission
Table of Contents
1  Scope ... 5 
2  Method Summary... 5 
3  Reagents ... 5 
4  Instrumentation ... 6 
5  Samples ... 8 
6  Analysis Steps ... 8 
7  Calculation of Analysis Results ... 9 
8 Precision ... 9 
9 Quality assurance and control ... 10 
Foreword
YS/T 575-2007 "Methods for chemical analysis of bauxite", the revision to YS/T
575-2006 (formerly GB/T 3257-1999), is divided into 24 parts.
-- Part 1. Determination of aluminum oxide content - EDTA titration method
-- Part 2. Determination of silica dioxide content - Gravimetric-molybdenum blue
photometric method
-- Part 3. Determination of silica dioxide content - Molybdenum blue photometric
method
-- Part 4. Iron oxide content - Potassium dichromate titration method
-- Part 5. Determination of iron trioxide content - Orthopenanthroline photometric
method
-- Part 6. Determination of titanium dioxide content - Diantipyryl methane
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 content of potassium oxide and sodium oxide - 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 - benzoyl phenyl
hydroxylamine photometric method
-- Part 13. Determination of zinc content - Flame atomic absorption
spectrophotometric method
-- Part 14. Determination of total rare earth oxide content - Tribromoarsenazo
photometric method
-- Part 15. Determination of gallium oxide content - Rhodamine B-extraction
photometric method
Methods for chemical analysis of bauxite -
Part 17. Determination of sulfur content -
Direct combustion - iodometric method
1 Scope
This Part specifies the determination method of sulfur content in bauxite.
This Part applies to the determination of sulfur content in bauxite. The determination
range. ≤3.00%.
2 Method Summary
In the presence of a flux, the sample is heated for decomposition in an oxygen stream at
1300°C±20°C; the sulfur dioxide generated is absorbed by water to form sulfurous acid;
use starch as the indicator; use iodine standard titration solution for titration, so as to
determine the sulfur content; the combined water in the sample influences the precision;
use rining method to eliminate.
3 Reagents
3.1 Lead sulfate. reference reagent.
3.2 Tin sheet (99.9%).
3.3 Sulfuric acid (ρ 1.84 g/mL).
3.4 Mixed flux. mix vanadium pentoxide and boron oxide of equal-mas; grind it finely; then
dry it under 105°C~110°C before use.
3.5 Potassium hydroxide (400 g/L).
3.6 Solution of potassium permanganate (50 g/L). dissolve 10g of potassium
permanganate in 200 mL of potassium hydroxide (3.5).
3.7 Absorption solution. use a little water to mix 0.5g of soluble starch; stir it into a paste;
add 100 mL of boiling water; stir and heat it to dissolve until transparent; use water to
dilute to 1L; drop-add iodine standard titration solution (3.8) until sky blue; transfer it to a
volumetric flask or under jar (3 in Figure 1); use water to dilute to 1 L; shake up; store it in
an amber bottle; use it after storage overnight.
3.8 Titration solution
Table 1
Mass fraction of sulfur content / % Allowable difference /%
≤0.050 0.01
>0.050 ~ 0.100 0.02
>0.10 ~ 0.50 0.04
>0.50 ~ 1.00 0.08
>1.00 ~ 3.00 0.15
9 Quality assurance and control
Use standard samples or control samples for verification during the analysis, or use
standard samples or control samples for verification at least once a year. When the
process is out of control, the causes shall be identified. And the verification shall be
carried out once again after the mistakes are corrected.
......
 
(Above excerpt was released on 2016-07-13, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/YST575.17-2007