Overview
ISO 6233:1983 specifies a standardized EDTA titrimetric method for determining the calcium and magnesium contents in manganese ores and concentrates. This internationally recognized procedure applies to products with calcium and magnesium concentrations above 0.3% (mass/mass). The method includes comprehensive instructions covering principle, reagents, apparatus, sample preparation, analytical procedure, and expression of results. It is intended to be used alongside ISO 4297 for general instructions on chemical analysis of manganese ores.
Key Topics
- Scope and Application
Applicable for analyzing manganese ores and concentrates with calcium and magnesium contents greater than 0.3%. Ensures reliable quantitative measurement of these elements using volumetric EDTA titration techniques.
- Analytical Principle
The method uses EDTA titration at controlled pH levels: calcium titrated at pH 13 and magnesium at pH 10 after separation from calcium as hydroxide. Indicators such as Eriochrome blue SE and Eriochrome black T facilitate endpoint detection, either visually or via photoelectrotitrimetry.
- Sample Preparation
Involves acid decomposition of the test sample using hydrochloric and nitric acids, removal of silicon by evaporation, digestion, and separation of interfering elements such as iron, aluminum, manganese, and barium through precipitation and filtration steps. Fusion techniques using sodium carbonate are performed to treat insoluble residues.
- Reagents and Apparatus
The method provides specifications for all reagents, including standard volumetric EDTA solutions, indicators, buffer solutions, and various acids. Equipment includes ordinary laboratory glassware and a photoelectrotitrimeter for photometric titration.
- Titration Procedures
Separate titrations are conducted for calcium and magnesium content determination, including photometric and visual titration options. Procedures for titrating calcium plus magnesium collectively are also included when appropriate.
- Expression of Results
Calculates calcium and magnesium contents as a percentage by mass, based on standardized titration volumes and concentrations.
Applications
ISO 6233:1983 is essential for industries involved in:
- Mineral Processing and Mining
Quality control and characterization of manganese ore and concentrate raw materials by determining calcium and magnesium impurities, which can affect smelting and refining.
- Metallurgy
Assisting metallurgists in adjusting processing parameters through accurate chemical composition data to optimize yield and reduce processing issues linked to calcium and magnesium.
- Chemical Analysis Laboratories
Providing a globally accepted method for laboratories analyzing manganese ores to ensure consistency, comparability, and reliability of test results for calcium and magnesium content.
- Regulatory Compliance and Reporting
Facilitating compliance with international trade and quality standards by providing verified chemical composition information for manganese stage products.
Related Standards
- ISO 4297: Manganese ores and concentrates - Methods of chemical analysis - General instructions
Provides overarching instructions relevant to chemical analyses, complementing ISO 6233 for manganese ore testing.
- ISO 4296-1: Sampling of manganese ores - Increment sampling
Describes sampling techniques that should be followed before analysis using ISO 6233.
- ISO 4296-2: Sampling of manganese ores - Preparation of samples
Specifies sample preparation necessary for proper chemical testing.
Practical Value
Using ISO 6233:1983 ensures accurate and reproducible measurement of calcium and magnesium in manganese ores, crucial for:
- Improving product specifications in mining operations.
- Enhancing process control in ore beneficiation and metallurgical processing.
- Providing confidence in analytical data through a validated internationally recognized procedure.
- Facilitating trade and certification by adhering to standardized chemical analysis methods.
This method remains a foundational reference for geologists, chemists, and metallurgists seeking precise and consistent quantification of calcium and magnesium within manganese ore quality assurance workflows.
Open preview (PDF)Manganese ores and concentrates — Determination of calcium and magnesium contents — EDTA titrimetric method
