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

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;

- Part 16.Determination of phosphorus pentoxide content - Molybdenum

blue spectrophotometric method;

- Part 17.Determination of sulfur content - Direct combustion-iodometric

method;

- Part 18.Determination of total carbon content - Non-aqueous titrimetric

method after combustion;

- Part 19.Determination of the loss on ignition - Gravimetric method;

- Part 20.Preparation of pre-dried sample;

- Part 21.Determination of organic carbon content titrimetric method;

- Part 22.Determination of hydroscopic moisture in analytical samples -

Gravimetric method;

- Part 23.Determination of element contents X-ray fluorescence

spectrometric method;

- Part 24.Determination of carbon content and sulfur content - Infrared

absorption method.

This Part is Part 1.

This Part replaces YS/T 575.1-2006 (formerly GB/T 3257.1-1999).

This Part is a modification to YS/T 575.1-2006.Compared with YS/T 575.1-

2006, the main changes in this Part are as follows.

- modified lead acetate standard solution in YS/T 575.1-2006 to zinc standard

solution, potassium fluoride solution to sodium fluoride;

- deleted the definition of "titer";

- unified the drying temperature of the specimen as 110°C±5°C;

- added precision.

This Part was proposed by and shall be under the jurisdiction of National

Technical Committee on Non-ferrous Metals of Standardization Administration

of China.

Main drafting organization of this Part. China Aluminum Corporation Zhengzhou

Research Institute.

The drafting organization of this Part. China Aluminum Corporation Shanxi

Branch.

Main drafters of this Part. Huang Anping, Yuan Xiaoke, He Xiaodong, He

Ruihong.

This Part shall be interpreted by National Technical Committee on Non-ferrous

Metals of Standardization Administration of China.

Version of standard substituted by this Part is.

- YS/T 575.1-2006 (formerly GB/T 3257.1-1999).

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.

3 Reagents

4 Specimen

Use a mortar to grind the specimen. Through a 74µm 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

6 Expression of analysis results

Calculate the mass fraction (%) of aluminum oxide according to the formula as

below.

7 Precision

8 Quality assurance and control

In analysis, use standard sample or control sample to verify. Or, at least use

standard sample or control sample to verify the analysis method once a year.

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