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YS/T 575.1-2007 English PDF (YST575.1-2007)

YS/T 575.1-2007 English PDF (YST575.1-2007)

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YS/T 575.1-2007: Methods for chemical analysis of bauxite. Part 1: Determination of aluminium oxide content. EDTA titrimetric method

This Part specifies the determination method of aluminium oxide content in bauxite. This Part is applicable to the determination of aluminium oxide content in bauxite. The determination range is 40%~80%.
YS/T 575.1-2007
NON-FERROUS METAL INDUSTRY STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
ICS 71.100.10
Q 52
Replacing YS/T 575.1-2006
Methods for chemical analysis of bauxite - Part 1:
Determination of aluminium oxide content - EDTA
titrimetric method
ISSUED ON: NOVEMBER 14, 2007
IMPLEMENTED ON: MAY 01, 2008
Issued by: National Development and Reform Commission
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Method summary ... 6
3 Reagents ... 6
4 Specimen ... 8
5 Analysis steps ... 8
6 Expression of analysis results ... 9
7 Precision ... 10
8 Quality assurance and control ... 10
Foreword
YS/T 575-2007 ?€?Methods for chemical analysis of bauxite?€? is a modification to YS/T 575-2006 (formerly GB/T 3257-1999). It has 24 parts in total:
- Part 1: Determination of aluminum 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 - Potassium 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, 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-benzoyl-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 photometric method;
- Part 15: Determination of gallium oxide content - Rhodamine B-extraction photometric method;
Methods for chemical analysis of bauxite - Part 1:
Determination of aluminium oxide content - EDTA
titrimetric method
1 Scope
This Part specifies the determination method of aluminium oxide content in bauxite.
This Part is applicable to the determination of aluminium oxide content in bauxite. The determination range is 40%~80%.
2 Method summary
The specimen is melted and decomposed by sodium carbonate-boric acid or sodium hydroxide, is extracted by hot water and is acidized by hydrochloric acid. Use lactic acid masked titanium or in the presence of EDTA, use sodium
hydroxide to separate and remove impurity elements such as iron and titanium. Then in the weakly acidic solution, make aluminum complex with excessive EDTA. Use xylenol orange as indicator. First, use lead standard solution to titrate the excessive EDTA. Then use fluoride salt to replace EDTA that is complexed with aluminum. At last, use lead standard solution to titrate the replaced EDTA.
3 Reagents
3.1 Anhydrous sodium carbonate.
3.2 Boric acid.
3.3 Sodium hydroxide.
3.4 Sodium fluoride.
3.5 Hydrochloric acid (??1.19g/mL).
3.6 Hydrochloric acid (1+1).
3.7 Hydrochloric acid (2+98).
into a 1000mL volumetric flask. Dilute to the scale and shake well.
4 Specimen
Use a mortar to grind the specimen. Through a 74??m sieve, place the well- ground specimen at 110??C??5??C to dry 2h. Place in a dryer. Cool to room
temperature for use.
5 Analysis steps
5.1 Test portion
Weigh 0.25g of specimen (4), to the nearest of 0.0001g.
5.2 Determination times
It shall conduct two determinations independently to a same specimen. Take the average value.
5.3 Determination
5.3.1 Test portion decomposition by any of the following methods
5.3.1.1 Put the test portion (5.1) in a 30mL platinum crucible. Add 1.7g of anhydrous sodium carbonate (3.1). Add 0.8g of boric acid (3.2). Use a platinum wire to stir well. Cover the crucible. Place it in a 100??C high-temperature furnace. Heat up to 1000??C. Melt 20min. Take it out to cool for a while. Add boiling water into the crucible. Heat till nearly-boiling to make all lumps dissolved. Move the solution into a 250mL beaker. Use hot water to wash the crucible twice. Then use 3mL of hydrochloric acid (3.7) and hot water to completely clean. Combine the detergent into the beaker. Add 20mL of hydrochloric acid (3.5) into the beaker. Cover the watch glass. Place it in a cold-water tank to cool to room temperature. Move the solution into a 250mL volumetric flask. Use water to clean the beaker. Combine the detergent into the volumetric flask. Use water to dilute to the scale and shake well.
5.3.1.2 Place the test portion (5.1) into a 30mL silver crucible. Add 3g of sodium hydroxide (3.3). Place in a 750??C??10??C muffle furnace. Melt 20min. Take it out. Rotate the crucible to make the melt adhere to the inner wall of the crucible evenly. Cool. Put the crucible into a glass funnel (??70mm). Use hot water to move the test portion into a 250mL volumetric flask that has been filled with 40mL of hydrochloric acid (3.6). Use hot water to clean the crucible. Add 5mL of hydrochloric acid (3.6) to clean the crucible. Then use hot water to clean the crucible and the funnel once again. Shake the solution well to dissolve all lumps. Cool to room temperature. Use water to dilute to the scale. Mix well.

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