Search Result of Chinese Standard: 'YS/T 575.17-2007'
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Methods for chemical analysis of bauxite. Part 17: Determination of sulfur content. Direct combustion-iodometric method
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YS/T 575.17-2007
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| YS/T 575.17-2007 | Chinese | 14 |
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Detail Information of YS/T 575.17-2007; YS/T575.17-2007
Description (Translated English): Methods for chemical analysis of bauxite. Part 17: Determination of sulfur content. Direct combustion-iodometric method
Sector / Industry: Nonferrous Metallurgy Industry Standard (Recommended)
Classification of Chinese Standard: Q52
Classification of International Standard: 71.100.10
Word Count Estimation: 7,777
Date of Issue: 2007-11-14
Date of Implementation: 2008-05-01
Older Standard (superseded by this standard): YS/T 575.17-2006
Drafting Organization: Zhengzhou Research Institute Aluminum Corporation of China
Administrative Organization: National Standardization Technical Committee of non-ferrous metals
Regulation (derived from): NDRC Notice No. 77 of 2007
Summary: This standard specifies the sulfur content of bauxite Determination. This standard applies to bauxite Determination of sulfur content. Measuring range: �� 3. 00%.
YS/T 575.17-2007
Methods for chemical analysis of bauxite.Part 17: Determination of sulfur content.Direct combustion-iodometric method
ICS 71.100.10
Q52
People's Republic of China Nonferrous Metals Industry Standard
Replacing YS/T 575.17-2006
Methods for chemical analysis of bauxite -
Part 17: Determination of sulfur content
Combustion - iodometric method
Posted 2007-11-14
2008-05-01 implementation
National Development and Reform Commission issued
Foreword
YS/T 575-2007 "chemical analysis of bauxite -" Is the YS/T 575-2006 (formerly GB/T 3257-1999) amendments
A total of 24 parts:
--- Part 1: aluminum oxide content - EDTA titration
--- Part 2: silica content - Gravimetric - molybdenum blue spectrophotometry
--- Part 3: Determination of silica content molybdenum blue photometric
--- Part 4: iron oxide content - Potassium dichromate titration
--- Part 5: Determination of iron oxide content phenanthroline spectrophotometry
--- Part 6: Determination of titanium dioxide content di Zhao DAM spectrophotometry
--- Part 7: calcium oxide content - Flame Atomic Absorption Spectrometry
--- Part 8: magnesium oxide content - Flame Atomic Absorption Spectrometry
--- Part 9: potassium hydroxide, sodium oxide content - Flame Atomic Absorption Spectrometry
--- Part 10: Determination of manganese oxide content by flame atomic absorption spectrometry
--- Part 11: chromium oxide content - Flame Atomic Absorption Spectrometry
--- Part 12: Determination of vanadium pentoxide content of benzoyl phenylhydroxylamine photometric method
--- Part 13: Determination of zinc content by flame atomic absorption spectrometry
--- Part 14: Determination of total rare earth oxide Tribromoarsenazo spectrophotometry
--- Part 15: Determination of gallium oxide content of rhodamine B extraction spectrophotometry
--- Part 16: Determination of phosphorus pentoxide molybdenum blue photometric
--- Part 17: Determination of sulfur content - Combustion - iodometric method
--- Part 18: Determination of total carbon content - Combustion - non-aqueous titration
--- Part 19: Determination of burning weight reduction method
--- Part 20: pre-dried sample preparation
--- Part 21: Determination of organic carbon titration
--- Part 22: Analysis of samples moisture intrudes content - Gravimetric method
--- Part 23: Determination of the chemical composition of the X-ray fluorescence spectrometry
--- Part 24: Determination of carbon and sulfur content infrared absorption method
This is Part 17.
The partial replacement of YS/T 575.17-2006 (formerly GB/T 3257.18-1999).
This section is amended to YS/T 575.17-2006, compared with YS/T 575.17-2006, the main changes are as follows:
--- Delete the definition of "titer" of;
--- The drying temperature of the sample unified 110 ℃ ± 5 ℃;
--- Increased precision.
The non-ferrous metal part by the National Standardization Technical Committee and centralized.
This part of the Aluminum Corporation of China Zhengzhou Research Institute is responsible for drafting.
This section drafted by the Aluminum Corporation of China Shandong Branch.
The main drafters of this section: Tian Rui, all red Tao.
The non-ferrous metal part by the National Standardization Technical Committee responsible for the interpretation.
This part of the standard replaces the previous editions are:
--- YS/T 575.17-2006 (formerly GB/T 3257.18-1999).
Methods for chemical analysis of bauxite -
Part 17: Determination of sulfur content
Combustion - iodometric method
1 Scope
This section provides the determination of sulfur content of bauxite.
This section applies to the determination of sulfur content of bauxite. Measuring range: ≤3.00%.
2 Method summary
Sample in the presence of a flux, in an oxygen stream 1300 ℃ ± 20 ℃ in thermal decomposition of the resulting sulfur dioxide is absorbed in water to form thionyl
Acid, starch as indicator, titrate with iodine standard solution titration to determine the sulfur content of the sample affect the accuracy of combined water, flushing method
eliminate.
3 Reagents
Lead sulfate 3.1: reference reagents.
3.2 tin sheet (99.9%).
3.3 sulfate (ρ1.84g/mL).
3.4 mixed flux: vanadium pentoxide and boron oxide mixed with other quality and finely ground, after 105 ℃ ~ 110 ℃ drying spare.
3.5 Potassium hydroxide (400g/L).
3.6 potassium permanganate solution (50g/L): 10g of potassium permanganate of potassium hydroxide was dissolved in 200mL (3.5) in.
3.7 Absorption solution: 0.5g soluble starch with a little water and stir into a paste, add boiling water, stirring heated to dissolve 100mL to transparent, water
Diluted to 1L, a solution of iodine titration standard solution (3.8) to the blue sky, moved into the flask or bottle under the mouth (Fig. 1, 3), diluted with water to 1L
Shake, stored in a brown bottle, after standing overnight use.
3.8 titration solution
3.8.1 standard titration solution of iodine titer sulfur calibration:
Weigh 0.0200g lead sulfate (3.1) in the porcelain boat, according to analytical procedure 6.4.2 titrated.
3.8.2 according to formula (1) to calculate the relative concentration of titration:
C = m1 × 0.1057 Vp - V0
(1)
Where:
C --- iodine standard solution titration titration relative mass concentration of sulfur in grams per liter (g/L);
Vp --- volume titration of the lead sulfate standard titration with iodine solution in milliliters (mL);
Volume V0 --- blank determination in the standard titration with iodine solution in milliliters (mL);
M1 --- the quality of lead sulfate with units of grams (g);
.1057 --- Lead sulfate sulfur conversion factor.
4 Instrument
4.1 furnace
Porcelain: within 21mm × w outer 25mm × L600mm conical tube. Porcelain boat: 88mm, with the former at 1000 ℃ burning more than 2h,
Stored in a desiccator.
4.2 measuring apparatus (FIG. 1).
1 --- absorption Cup: built-absorption solution (3.7);
2 --- absorbing liquid contents (3.7) as a reference solution;
3 --- absorbing solution (washed with);
4 --- Erlenmeyer flask (internal water);
5 --- piston or spring clips (flush with);
6 --- Y-tube (washed with);
7 --- tube furnace;
8 --- glass tee piston;
. 9 --- oxygen bottles;
10 --- pressure regulator valve;
. 11 --- meter (gas);
12 --- scrubber: Built potassium permanganate solution (3.6);
13 --- scrubber: Built sulfuric acid (3.3);
14 --- sewage calcium chloride drying tower;
15 --- platinum rhodium thermocouple.
Figure 1
4.3 flushing device (Fig. 2).
4.4 Y-tube (Figure 3).
1 --- pores;
2 --- glass;
3 --- spring clip;
4 --- hose;
5 --- tube furnace.
Figure 2 Figure 3
5 Sample
The sample was ground with a mortar through 74μm sieve, the sample is placed in a good research at 110 ℃ ± 5 ℃ oven drying 2h, placed in a desiccator, cooled
But to room temperature before use.
Step 6 Analysis
6.1 Sample
Weigh 0.1g ~ 0.5g sample (5), accurate to 0.0001g.
6.2 Determination of the number of
On the same sample should be independently measured twice and averaged.
6.3 blank test
Along with sample blank test.
6.4 Determination
6.4.1 connection Figure 1 good measurement device, the furnace temperature was gradually raised to 1300 ℃ ± 20 ℃ (refers to the temperature at the discharge porcelain boat), the oxygen through inspection, indeed
After the communication device does not leak, controlling the oxygen flow rate of about 900mL/min, to absorb the cup (Figure 1, 2) each added 130mL absorbing solution (3.7).
6.4.2 Weighed sample (6.1) is placed in a porcelain boat. Plus 0.2g mixed flux (3.4), 1g tin sheet, stainless steel hook it into the tube
Furnace hot zone quickly plugged stopper, preheating 10s ~ 20s, through the oxygen (3.8) titrated with standard iodine titration solution, absorption solution should always
Stays blue when dropped on the absorbent cup (Figure 1, 2) to the solution (reference solution) the same color, slowly start to connect the absorbing solution bottle (Figure 1
3) a piston (5 in FIG. 1).
7. Calculation of analytical results
According to the formula (2) calculate the sulfur content (%):
(S) =
C · (Vp - V0)
M1 × 100
(2)
Where:
C --- iodine standard solution titration titration relative mass concentration of sulfur (3.8.2), in grams per milliliter (g/mL);
Vp --- analysis volume titration step is iodine standard solution (3.8) in milliliters (mL);
Volume V0 --- blank test (6.3) in the titration of iodine standard solution (3.8) used, in milliliters (mL);
M1 --- sample mass, in grams (g);
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