GB/T 5762-2024 Methods for chemical analysis of limestone, quicklime and hydrated lime for building materials industry
1 Scope
This document describes the standard methods and alternative methods for chemical analysis of limestone, quicklime and hydrated lime.
This document is applicable to the chemical analysis of limestone, quicklime and hydrated lime for building materials industry.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 176 Methods for chemical analysis of cement
GB/T 2007.1 General rules for the sampling and sample preparation of minerals in bulk - Sampling by manual method
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 28629 Methods for chemical analysis of free silicon dioxide in cement clinker
GB 31893 Limit and determination method of water-soluble chromium(VI) in cement
JJG 196 Verification regulation of working glass container
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
efficacious calcium
total amount of free calcium oxide and calcium hydroxide determined under specified determination conditions
Note 1: Calcium carbonate, calcium silicate and other calcium salts are not included.
Note 2: Generally, quicklime is expressed as efficacious calcium oxide and hydrated lime is expressed as efficacious calcium hydroxide.
3.2
limestone calcium carbonate titration value
total amount of calcium carbonate and magnesium carbonate in limestone
Note: It is expressed as the mass fraction of calcium carbonate.
4 General requirements for tests
4.1 Number of tests
The number of tests for each determination is specified as two. If the absolute difference between the two results is within the permissible tolerance in the same laboratory (Table 1), the average of the two test results shall be used to represent the determination result.
4.2 Expression of masses, volumes, titers and results
Mass is expressed in gram (g), to the nearest of 0.0001 g. Burette volume is expressed in milliliter (mL), with the readings to the nearest of 0.01 mL. The unit of titer is milligram per milliliter (mg/mL).
The concentration, titer and volume ratio of standard volumetric solutions shall be rounded to four significant figures.
Unless otherwise specified, analytical results of water-soluble chromium(Ⅵ) shall be expressed in milligram per kilogram (mg/kg) and rounded to one decimal place; those of chloride ion shall be expressed as mass fraction and rounded to three decimal places; and other analytical results shall be expressed as mass fraction and rounded to two decimal places.
The rounding off of numerical value shall be in accordance with GB/T 8170.
4.3 Blank test
Conduct the test following the same determination steps without adding a specimen but using an equal amount of reagent. Correct the obtained determination results accordingly.
4.4 Ignition
Place the filter paper and precipitate into a crucible that has been pre-ignited and tared to constant mass, cover the crucible with the lid (leaving a gap). To avoid generating flames, dry and ash slowly in an oxidizing atmosphere until there are no black carbon particles, then place it into a high-temperature furnace (see 6.8) and ignite at the specified temperature. Cool to room temperature in a desiccator (see 6.6), then weigh.
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements for tests
5 Reagents and materials
6 Instruments and apparatus
7 Preparation of specimens
8 Determination of loss on ignition—ignition subtraction method
9 Determination of silicon dioxide—ammonium chloride gravimetric method (standard method)
10 Determination of iron(III) oxide—1,10-phenanthroline spectrophotometry (standard method)
11 Determination of aluminum oxide—direct EDTA titration for combined iron and aluminum content (standard method)
12 Determination of calcium oxide—EDTA titration method (standard method)
13 Determination of magnesium oxide—atomic absorption spectrophotometry (standard method)
14 Determination of titanium dioxide—Diantipyrylmethane spectrophotometry (standard method)
15 Determination of potassium oxide and sodium oxide—Flame photometric method (standard method)
16 Determination of total sulfur—Barium sulfate gravimetric method (standard method)
17 Determination of chloride ion—Ammonium thiocyanate volumetric method (standard method)
18 Determination of manganese(II) oxide—Potassium periodate oxidation spectrophotometry (standard method)
19 Determination of phosphorus pentoxide—Phosphomolybdenum blue spectrophotometry (standard method)
20 Determination of carbon dioxide—Alkaline asbestos absorption gravimetric method
21 Determination of quicklime A (CaO+MgO) content—Hydrochloric acid titration method
22 Determination of efficacious calcium—Calcium sucrate-hydrochloric acid titration method
23 Determination of limestone calcium carbonate titration value—Hydrochloric acid back titration method
24 Determination of free silicon dioxide
25 Determination of silicon dioxide—Potassium fluorosilicate volumetric method (alternative method)
26 Determination of iron(III) oxide—EDTA direct titration method (alternative method)
27 Determination of iron(III) oxide—Atomic absorption spectrophotometry (alternative method)
28 Determination of aluminum oxide—Direct titration method (alternative method)
29 Determination of aluminum oxide—Copper sulfate back titration method (alternative method)
30 Determination of calcium oxide—Sodium hydroxide fusion—EDTA titration (alternative method)
31 Determination of magnesium oxide—EDTA titration subtraction method (alternative method)
32 Determination of potassium oxide and sodium oxide—Atomic absorption spectrophotometry (alternative method)
33 Determination of total sulfur—Coulometric titration (alternative method)
34 Determination of total sulfur—Infrared analysis method (alternative method)
35 Determination of chloride ion—Ion chromatography (alternative method)
36 Determination of chloride ion—(Automatic) potentiometric titration method (alternative method)
37 Determination of manganese(II) oxide—Atomic absorption spectrophotometry (alternative method)
38 Determination of iron(III) oxide, aluminum oxide, magnesium oxide, titanium dioxide, potassium oxide, sodium oxide, manganese(II) oxide and phosphorus pentoxide—Inductively coupled plasma optical emission spectrometry (alternative method)
39 Determination of silicon dioxide, iron(III) oxide, aluminum oxide, calcium oxide, magnesium oxide, titanium dioxide, potassium oxide, sodium oxide, manganese(II) oxide, phosphorus pentoxide and chloride ion—X-ray fluorescence spectrometry (alternative method)
40 Determination of water-soluble chromium(VI)
41 Permissible tolerance
GB/T 5762-2024 Methods for chemical analysis of limestone, quicklime and hydrated lime for building materials industry
1 Scope
This document describes the standard methods and alternative methods for chemical analysis of limestone, quicklime and hydrated lime.
This document is applicable to the chemical analysis of limestone, quicklime and hydrated lime for building materials industry.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 176 Methods for chemical analysis of cement
GB/T 2007.1 General rules for the sampling and sample preparation of minerals in bulk - Sampling by manual method
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 28629 Methods for chemical analysis of free silicon dioxide in cement clinker
GB 31893 Limit and determination method of water-soluble chromium(VI) in cement
JJG 196 Verification regulation of working glass container
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
efficacious calcium
total amount of free calcium oxide and calcium hydroxide determined under specified determination conditions
Note 1: Calcium carbonate, calcium silicate and other calcium salts are not included.
Note 2: Generally, quicklime is expressed as efficacious calcium oxide and hydrated lime is expressed as efficacious calcium hydroxide.
3.2
limestone calcium carbonate titration value
total amount of calcium carbonate and magnesium carbonate in limestone
Note: It is expressed as the mass fraction of calcium carbonate.
4 General requirements for tests
4.1 Number of tests
The number of tests for each determination is specified as two. If the absolute difference between the two results is within the permissible tolerance in the same laboratory (Table 1), the average of the two test results shall be used to represent the determination result.
4.2 Expression of masses, volumes, titers and results
Mass is expressed in gram (g), to the nearest of 0.0001 g. Burette volume is expressed in milliliter (mL), with the readings to the nearest of 0.01 mL. The unit of titer is milligram per milliliter (mg/mL).
The concentration, titer and volume ratio of standard volumetric solutions shall be rounded to four significant figures.
Unless otherwise specified, analytical results of water-soluble chromium(Ⅵ) shall be expressed in milligram per kilogram (mg/kg) and rounded to one decimal place; those of chloride ion shall be expressed as mass fraction and rounded to three decimal places; and other analytical results shall be expressed as mass fraction and rounded to two decimal places.
The rounding off of numerical value shall be in accordance with GB/T 8170.
4.3 Blank test
Conduct the test following the same determination steps without adding a specimen but using an equal amount of reagent. Correct the obtained determination results accordingly.
4.4 Ignition
Place the filter paper and precipitate into a crucible that has been pre-ignited and tared to constant mass, cover the crucible with the lid (leaving a gap). To avoid generating flames, dry and ash slowly in an oxidizing atmosphere until there are no black carbon particles, then place it into a high-temperature furnace (see 6.8) and ignite at the specified temperature. Cool to room temperature in a desiccator (see 6.6), then weigh.
Contents of GB/T 5762-2024
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements for tests
5 Reagents and materials
6 Instruments and apparatus
7 Preparation of specimens
8 Determination of loss on ignition—ignition subtraction method
9 Determination of silicon dioxide—ammonium chloride gravimetric method (standard method)
10 Determination of iron(III) oxide—1,10-phenanthroline spectrophotometry (standard method)
11 Determination of aluminum oxide—direct EDTA titration for combined iron and aluminum content (standard method)
12 Determination of calcium oxide—EDTA titration method (standard method)
13 Determination of magnesium oxide—atomic absorption spectrophotometry (standard method)
14 Determination of titanium dioxide—Diantipyrylmethane spectrophotometry (standard method)
15 Determination of potassium oxide and sodium oxide—Flame photometric method (standard method)
16 Determination of total sulfur—Barium sulfate gravimetric method (standard method)
17 Determination of chloride ion—Ammonium thiocyanate volumetric method (standard method)
18 Determination of manganese(II) oxide—Potassium periodate oxidation spectrophotometry (standard method)
19 Determination of phosphorus pentoxide—Phosphomolybdenum blue spectrophotometry (standard method)
20 Determination of carbon dioxide—Alkaline asbestos absorption gravimetric method
21 Determination of quicklime A (CaO+MgO) content—Hydrochloric acid titration method
22 Determination of efficacious calcium—Calcium sucrate-hydrochloric acid titration method
23 Determination of limestone calcium carbonate titration value—Hydrochloric acid back titration method
24 Determination of free silicon dioxide
25 Determination of silicon dioxide—Potassium fluorosilicate volumetric method (alternative method)
26 Determination of iron(III) oxide—EDTA direct titration method (alternative method)
27 Determination of iron(III) oxide—Atomic absorption spectrophotometry (alternative method)
28 Determination of aluminum oxide—Direct titration method (alternative method)
29 Determination of aluminum oxide—Copper sulfate back titration method (alternative method)
30 Determination of calcium oxide—Sodium hydroxide fusion—EDTA titration (alternative method)
31 Determination of magnesium oxide—EDTA titration subtraction method (alternative method)
32 Determination of potassium oxide and sodium oxide—Atomic absorption spectrophotometry (alternative method)
33 Determination of total sulfur—Coulometric titration (alternative method)
34 Determination of total sulfur—Infrared analysis method (alternative method)
35 Determination of chloride ion—Ion chromatography (alternative method)
36 Determination of chloride ion—(Automatic) potentiometric titration method (alternative method)
37 Determination of manganese(II) oxide—Atomic absorption spectrophotometry (alternative method)
38 Determination of iron(III) oxide, aluminum oxide, magnesium oxide, titanium dioxide, potassium oxide, sodium oxide, manganese(II) oxide and phosphorus pentoxide—Inductively coupled plasma optical emission spectrometry (alternative method)
39 Determination of silicon dioxide, iron(III) oxide, aluminum oxide, calcium oxide, magnesium oxide, titanium dioxide, potassium oxide, sodium oxide, manganese(II) oxide, phosphorus pentoxide and chloride ion—X-ray fluorescence spectrometry (alternative method)
40 Determination of water-soluble chromium(VI)
41 Permissible tolerance
