AS 2503.4-1987

1 - AS 2503.4-1987 REFRACTORIES AND REFRACTORY MATERIALS - CHEMICAL ANALYSIS - DOLOMITES AND MAGNESITES
3 - PREFACE
4 - CONTENTS
5 - SECTION 1. SCOPE AND GENERAL
5 - 1.1 SCOPE.
5 - 1.2 APPLICATION.
5 - 1.3 PRINCIPLE.
6 - 1.4 REPEATABILITY.
6 - 1.5 REFERENCED DOCUMENTS.
6 - 1.6 DEFINITIONS.
6 - 1.6.1 Dolomite-magnesite refractory
6 - 1.6.2 Dolomite refractory
6 - 1.6.3 Magnesite-dolomite refractory
6 - 1.6.4 Magnesite refractory
7 - SECTION 2. SAMPLING AND SAMPLE PREPARATION
7 - 2.1 SCOPE OF SECTION.
7 - 2.2 GROSS SAMPLING.
7 - 2.2.1 Shaped materials.
7 - 2.2.2 Bulk or ground materials.
7 - 2.3 PREPARATION OF SAMPLE.
7 - 2.3.1 Crushing.
7 - 2.3.2 Samples for analysis.
8 - SECTION 3. DETERMINATION OF LOSS ON IGNITION
8 - 3.1 SCOPE OF SECTION.
8 - 3.2 APPARATUS.
8 - 3. 2.1 Balance
8 - 3.2.2 Drying oven
8 - 3.2.3 Muffle furnace
8 - 3.2.4 Platinum crucible
8 - 3.3 PROCEDURE.
9 - SECTION 4. DETERMINATION OF SILICON, IRON, TITANIUM, MANGANESE, CHROMIUM, ALUMINIUM, CALCIUM AND MAGNESIUM OXIDES
9 - 4.1 SCOPE OF SECTION.
9 - 4.2 REAGENTS.
9 - 4.2.1 General.
9 - 4.2.2 Solid reagents.
9 - 4.2.3 General solutions and solvents.
10 - 4.2.4 Standard solutions.
11 - 4.2.5 Indicators.
12 - 4.3 APPARATUS.
12 - 4.3.1 Glassware.
12 - 4.3.2 Steam bath.
12 - 4.3.3 UV-Visible spectrophotometer
12 - 4.4 PROCEDURE.
12 - 4.4.1 Blank determination.
12 - 4.4.2 Determination of silicon dioxide.
13 - 4.4.3 Determination of iron as iron(III) oxide.
14 - 4.4.4 Determination of titanium dioxide.
14 - 4.4.5 Determination of manganese oxide.
15 - 4.4.6 Determination of chromium oxide.
16 - 4.4.7 Determination of aluminium oxide.
17 - 4.4.8 Determination of calcium oxide.
17 - 4.4.9 Determination of magnesium oxide.
19 - SECTION 5 DETERMINATION OF SODIUM, POTASSIUM AND LITHIUM OXIDES
19 - 5.1 SCOPE OF SECTION.
19 - 5.2 REAGENTS.
19 - 5.2.1 General.
19 - 5.2.2 Aluminium sulphate, solid.
19 - 5.2.3 Solutions.
19 - 5.3 APPARATUS.
19 - 5.3.1 Flame photometer*.
19 - 5.3.2 Platinum dish fitted with a lid.
19 - 5.4 PROCEDURE.
19 - 5.4.1 Preliminary procedures.
20 - 5.4.2 Determination of sodium, potassium and lithium oxides*.
21 - SECTION 6. DETERMINATION OF BORON IN MAGNESITES
21 - 6.1 SCOPE OF SECTION.
21 - 6.2 REAGENTS.
21 - 6.2.1 General.
21 - 6.2.2 Solutions.
21 - 6.2.3 Standard solutions.
21 - 6.3 APPARATUS.
21 - 6.3.1 Water bath.
21 - 6.4 PROCEDURE.
21 - 6.4.1 Blank determination.
21 - 6.4.2 Solutions for analysis.
22 - 6.4.3 Determination of boron(III) oxide.
23 - SECTION 7. TEST REPORT
24 - APPENDIX A - STANDARDIZATION OF SOLUTIONS
24 - A1 INTRODUCTION.
24 - A2 REPEATABILITY.
24 - A3 REAGENTS AND SOLUTIONS.
24 - A4 PROCEDURE.
24 - A4.1 CDTA against magnesium.
24 - A4.2 EDTA against zinc.
25 - A4.3 EGTA against calcium.
26 - APPENDIX B - SCHEME OF ANALYSIS FOR DOLOMITES AND MAGNESITES
26 - B1 IGNITION LOSS: ANALYSIS FOR SiO2, Fe2O3, MgO, CaO, TiO2, MnO, Cr2O3, Al2O3.
28 - B2 ANALYSIS FOR Na2O, K2O, Li2O.
28 - B3 ANALYSIS FOR B2O3 IN MAGNESITES.

Describes a gravimetric method for determining loss of ignition and classical (wet analysis) and spectrophotometric methods of analysis of dolomites and magnesites used as refractory materials. Includes determination of oxides of silicon, iron, titanium, manganese, chromium, aluminium, calcium, magnesium and boron (for magnesites only). Sodium, potassium and lithium oxides are determined by flame photometry. Typical compositions of dolomites and magnesites are contoured in table form together with a statement on repeatability of the analyses.

This Standard sets out methods for the sampling, preparation of samples and analysis of dolomite and magnesite refractories and refractory materials. Procedures are described for determining-(a) the loss on ignition*;(b) the chemical composition*, i.e. the amount of silicon, iron, titanium, manganese, chromium, aluminium, magnesium, calcium, sodium, potassium and lithium present in magnesites and dolomites, expressed as the oxides of these elements; and(c) the boron content of magnesites expressed as boron(III) oxide.

Reconfirmed 1995