AS 2503.5-1989

1 - AS 2503.5-1989 REFRACTORIES AND REFRACTORY MATERIALS - CHEMICAL ANALYSIS - CHROME-BEARING MATERIALS
4 - PREFACE
5 - CONTENTS
6 - SECTION 1. SCOPE AND GENERAL
6 - 1.1 SCOPE.
6 - 1.2 REFERENCED DOCUMENTS.
6 - 1.3 PRINCIPLE.
7 - 1.4 REPEATABILITY.
7 - 1.5 DEFINITIONS.
7 - 1.5.1 Chrome-alumina refractory
7 - 1.5.2 Chrome-dolomite refractory
7 - 1.5.3 Chromite
7 - 1.5.4 Chrome-magnesite refractory
7 - 1.5.5 Chrome ore
7 - 1.5.6 Chrome refractory
7 - 1.5.7 Chrome-silica refractory
7 - 1.5.8 Chrome-sillimanite refractory
7 - 1.5.9 Magnesiochromite
7 - 1.5.10 Magnesite-chrome refractory
8 - SECTION 2. SAMPLING AND SAMPLE PREPARATION
8 - 2.1 SCOPE OF SECTION.
8 - 2.2 GROSS SAMPLING.
8 - 2.2.1 Shaped materials.
8 - 2.2.2 Bulk or ground materials.
8 - 2.3 PREPARATION OF SAMPLE.
8 - 2.3.1 Crushing.
8 - 2.3.2 Test samples.
9 - SECTION 3. DETERMINATION OF LOSS ON IGNITION
9 - 3.1 SCOPE OF SECTION.
9 - 3.2 APPARATUS.
9 - 3.2.1 Drying oven
9 - 3.2.2 Muffle furnace
9 - 3.2.3 Platinum crucible
9 - 3.2.4 Weighing balance
9 - 3.3 PROCEDURE.
10 - SECTION 4. DETERMINATION OF SILICON
10 - 4.1 SCOPE OF SECTION.
10 - 4.2 REAGENTS.
10 - 4.2.1 General.
10 - 4.2.2 Solid reagents.
10 - 4.2.3 Solutions.
10 - 4.3 APPARATUS.
10 - 4.3.1 Glassware
10 - 4.3.2 Hot water bath
10 - 4.3.3 Platinum dish
10 - 4.3.4 Sintered glass crucible
10 - 4.3.5 Common apparatus.
10 - 4.4 PROCEDURE.
10 - 4.4.1 Blank test.
10 - 4.4.2 Continuity of analysis.
10 - 4.4.3 Determination.
12 - SECTION 5. DETERMINATION OF CHROMIUM
12 - 5.1 SCOPE OF SECTION.
12 - 5.2 REAGENTS.
12 - 5.2.1 Introduction.
12 - 5.2.2 Solid reagents.
12 - 5.2.3 General solutions.
12 - 5.2.4 Standard solutions.
12 - 5.2.5 Indicator-barium diphenylamine sulfonate solution
12 - 5.3 APPARATUS.
12 - 5.4 PROCEDURE.
12 - 5.4.1 Blank test.
12 - 5.4.2 Determination.
13 - SECTION 6. DETERMINATION OF TITANIUM, IRON, ALUMINIUM, MANGANESE, CALCIUM AND MAGNESIUM
13 - 6.1 SCOPE.
13 - 6.2 REAGENTS.
13 - 6.2.1 Introduction.
13 - 6.2.2 Solid reagents.
13 - 6.2.3 General solutions.
14 - 6.2.4 Standard solutions.
14 - 6.2.5 Indicators.
15 - 6.3 APPARATUS.
15 - 6.3.1 Steam bath.
15 - 6.3.2 UV-visible spectrophotometer
15 - 6.3.3 Common apparatus.
15 - 6.4 PROCEDURE.
15 - 6.4.1 Blank test.
15 - 6.4.2 Preparation of test solution (solution A).
16 - 6.4.3 Determination of titanium dioxide.
16 - 6.4.4 Determination of iron as iron(III) oxide.
16 - 6.4.5 Determination of manganese oxide.
16 - 6.4.6 Determination of aluminium oxide.
17 - 6.4.7 Determination of calcium oxide.
18 - 6.4.8 Determination of magnesium oxide.
19 - SECTION 7. DETERMINATION OF SODIUM, POTASSIUM AND LITHIUM OXIDES
19 - 7.1 SCOPE OF SECTION.
19 - 7.2 REAGENTS.
19 - 7.2.1 General.
19 - 7.2.2 Solutions.
19 - 7.3 APPARATUS.
19 - 7.3.1 Flame photometer
19 - 7.3.2 Common apparatus
19 - 7.4 PROCEDURE.
19 - 7.4.1 Preliminary procedures.
19 - 7.4.2 Determination of sodium, potassium and lithium oxides.
20 - SECTION 8. TEST REPORT
21 - APPENDIX A - STANDARDIZATION OF CDTA AND EGTA SOLUTIONS
21 - A1 SCOPE.
21 - A2 REPEATABILITY.
21 - A3 REAGENTS AND SOLUTIONS.
21 - A4 PROCEDURE.
21 - A4.1 Standardization of CDTA against magnesium.
21 - A4.2 Standardization of CDTA against zinc.
22 - A4.3 Standardization of EGTA against calcium.
23 - APPENDIX B - STANDARDIZATION OF AMMONIUM IRON(II) SULFATE SOLUTION
23 - B1 SCOPE.
23 - B2 REPEATABILITY.
23 - B3 REAGENTS AND SOLUTIONS.
23 - B4 PROCEDURE.
24 - APPENDIX C - SCHEME OF ANALYSIS FOR CHROME-BEARING MATERIALS

Describes a gravimetric method for determining loss on ignition, and classical (wet analysis) and spectrophotometric methods of analysis for silicon, chromium, iron, aluminium, manganese, calcium and magnesium. Sodium, potassium and lithium are determined by flame photometry. Includes tabulation of typical composition of chrome-bearing materials to which This Standard is applicable, a statement on repeatability of the determinations, and a flowchart summarizing the total scheme of analyses.

This Standard sets out methods for the sampling, sample preparation, and analysis of chrome-bearing refractories and refractory materials. Procedures are described for determining-(a) the loss on ignition*; (b) the chemical composition*, viz the amount of silicon, chromium, titanium, iron, aluminium, manganese,calcium, magnesium, sodium, potassium and lithium present in chrome-bearing materials, expressed as the oxides of these elements.NOTE: Appendix C provides an overview of these test procedures in flowchart form.

Under Revision see DR 02506 CP