YS/T 575.29-2023 PDF English
US$219.00 · In stock · Download in 9 secondsYS/T 575.29-2023: Methods for chemical analysis of bauxite - Part 29: Determination of available alumina and reactive silica Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid
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Methods for chemical analysis of bauxite - Part 29: Determination of available alumina and reactive silica
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YS/T 575.29-2023: Methods for chemical analysis of bauxite - Part 29: Determination of available alumina and reactive silica
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/YST575.29-2023
YS
NONFERROUS METAL INDUSTRY STANDARD
ICS 71.040.40
CCS H 30
Methods for chemical analysis of bauxite - Part 29.
Determination of available alumina and reactive silica
Issued on: DECEMBER 20, 2023
Implemented on: JULY 01, 2024
Issued by. Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword... 3
Introduction... 6
1 Scope... 7
2 Normative references... 7
3 Terms and definitions... 7
4 Principle... 7
5 Reagents... 8
6 Instruments... 9
7 Sample... 9
8 Test steps... 10
9 Test data processing... 11
10 Precision... 12
11 Test report... 13
Methods for chemical analysis of bauxite - Part 29.
Determination of available alumina and reactive silica
1 Scope
This document describes the method for the determination of available alumina and
reactive silicon in bauxite ore.
This document is applicable to the determination of available alumina and reactive
silicon in bauxite ore. The determination range for available alumina is 30.00% ~
60.00%; the determination range for reactive silicon is 0.10% ~ 10.00%.
2 Normative references
The contents of the following documents, through normative references, constitute
essential provisions of this document. 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 6682 Water for analytical laboratory use - Specification and test methods
GB/T 8170 Rules of rounding off for numerical values & expression and judgement
of limiting values
3 Terms and definitions
There are no terms or definitions that require definition in this document.
4 Principle
Bauxite ore is dissolved in sodium hydroxide solution at a specific temperature and
time. A certain volume of the solution is aliquoted and determined by the EDTA
volumetric method. The alumina content obtained is the effective alumina content in
the bauxite ore. The residue is treated with acid; a certain volume of the treated solution
is aliquoted and mixed with the previous solution. It is determined by silicate
molybdenum blue spectrophotometry. The silica content obtained is the reactive silicon
content in the bauxite ore.
5 Reagents
Unless otherwise specified, only reagents of confirmed analytical grade and grade II
water meeting the requirements of GB/T 6682 are used in the analysis.
5.1 Hydrochloric acid (1 + 11).
5.2 Hydrochloric acid (1 + 5).
5.3 Aqueous ammonia (1 + 5).
5.4 Sodium hydroxide solution (50 g/L, calculated as Na2O). Weigh 64.516 g of sodium
hydroxide into a 2000 mL beaker; dissolve in water; cool to room temperature; use
water to dilute it to 1000 mL; mix thoroughly; transfer to a polyethylene bottle.
5.5 Acetic acid-sodium acetate buffer solution (pH approximately 5.7). Weigh 121 g of
anhydrous sodium acetate into a 2000 mL beaker; dissolve in 700 mL of water; then
add 9.6 mL of glacial acetic acid (ρ = 1.05 g/mL); use water to dilute to 1000 mL.
5.6 Ammonium molybdate solution (100 g/L).
5.7 Sulfuric acid-oxalic acid-ferrous ammonium sulfate mixed solution. Weigh 10 g of
ferrous ammonium sulfate into a 2000 mL beaker; add 400 mL of water to dissolve it.
Then add 60 mL of sulfuric acid (1 + 1). Weigh 10 g of oxalic acid into a 2000 mL
beaker; add 300 mL of water to dissolve it. After cooling, mix with the previous solution
and use water to dilute to 1000 mL.
5.8 Zinc standard titration solution (0.02942 mol/L). Weigh 2.3945 g of standard zinc
oxide (calcined in a high-temperature furnace at 800 °C ± 50 °C to constant weight);
moisten with a small amount of water; dissolve in 30 mL of hydrochloric acid (1 + 1);
cool it; transfer to a 1000 mL volumetric flask; use water to dilute to the mark; mix
thoroughly.
5.9 Prepare and calibrate the disodium ethylenediaminetetraacetic acid (EDTA)
standard titrant solution (c ≈ 0.05 mol/L) as follows.
a) Weigh 19.8 g of disodium ethylenediaminetetraacetic acid into a 500 mL beaker.
Dissolve the solution in 200 mL of water. Transfer the solution to a 1000 mL
volumetric flask; use water to dilute to the mark; mix thoroughly.
b) Pipette three 15.00 mL portions of the zinc standard titrant solution (5.8) into
separate 250 mL conical beakers. Add 80 mL of water and 2 drops of xylenol
orange indicator (5.12). Adjust the solution to an orange color with aqueous
ammonia (5.3). Add 15 mL of buffer solution (5.5) and 1 drop of bromocresol
green indicator (5.11). Titrate with the EDTA standard titrant solution. The
endpoint is reached when the solution changes from purple to green. Perform a
blank test at the same time.
5.10 Silicon dioxide standard solution. Weigh 0.1000 g of silicon dioxide (wSiO2 ≥
99.99%), that has been pre-calcined at 1000 °C for 2 h and cooled to room temperature,
into a platinum crucible; add 3 g of anhydrous sodium carbonate; mix thoroughly. Cover
the crucible with 1 g of anhydrous sodium carbonate; place it in a 950 °C furnace to
melt for 12 minutes. Remove and cool it; place in a plastic cup. Leach with 200 mL of
boiling water. Rinse the crucible and lid. Cool to room temperature; transfer to a 1000
mL volumetric flask; use water to dilute to the mark; mix it; store in a plastic bottle. 1
mL of this solution contains 0.1 mg of silica.
6 Instruments
6.1 Dissolution apparatus. Microwave digester with 100 mL polytetrafluoroethylene
digestion tubes.
Note. Other dissolution apparatus may be selected based on sample characteristics.
6.2 Spectrophotometer.
7 Sample
Grind the sample to pass through a standard sieve with a pore size of 75 µm; dry it in
an oven at 110 °C ± 5 °C for 2 h; place it in a desiccator; cool it to room temperature
for later use.
8 Test steps
8.1 Test material
Weigh 1.00 g of sample (7), accurate to 0.0001 g.
8.2 Parallel test
Perform two parallel tests and take the average value.
8.3 Blank test
Perform a blank test with the sample.
8.4 Determination
8.4.1 Place the sample (8.1) in a digestion tube; add 20.0 mL of sodium hydroxide
solution (5.4); shake well; transfer to the dissolution apparatus (6.1); keep it at 143 °C
for 30 min.
Note. The holding temperature and time can be adjusted according to different samples.
8.4.2 Transfer the contents of the dissolution apparatus (8.4.1) to a 250 mL volumetric
flask with water; use water to dilute to the mark; mix thoroughly. Filter the test solution
through quantitative filter paper; transfer the entire contents of the volumetric flask into
a funnel; set aside the residue; place the filtrate in a 250 mL beaker.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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