ISO 8889:1988 PDF

Chromium ores and concentrates — Determination of aluminium content — Complexometric method

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Title (English):

ISO 8889:1988

Chromium ores and concentrates — Determination of aluminium content — Complexometric method

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 3
Publication date:: February 4, 1988
Edition:: ISO IS 8889 edition 1 version 1
ICS:: 73.060.30

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Description (English):

The method is applicable to a concentration range of 1.5 to 20.0 % (m/m) of aluminium. ISO 8889 should be read in conjunction with ISO 6629. Specifies principle, reagents, apparatus, sample, procedure and expression of results.

Technical details

Technical committee: ISO/TC 132 - Ferroalloys
SKU: ISO 8889:1988

Abstract

Overview

ISO 8889:1988 is an international standard published by ISO that specifies a complexometric method for determining aluminium content in chromium ores and concentrates. The method applies to aluminium concentrations ranging from 1.5% to 20.0% by mass. This standard complements ISO 6629, which covers general instructions for chemical analysis of chromium ores and concentrates. The procedure includes detailed specifications for reagents, apparatus, sample preparation, and calculation of results to ensure reliable and reproducible measurement of aluminium in chromium minerals.

Key Topics

Scope and Range
- Applicable for aluminium content between 1.5% and 20.0% (m/m).
- Suitable for chromium ores and concentrates analysis.
Principle of the Method
- Involves decomposition of the test sample with perchloric, nitric, and hydrochloric acids.
- Chromium is removed by distillation in the form of chromyl chloride.
- Insoluble residue is ignited, fused with sodium disulfate, and combined with the main solution.
- Hydroxides are precipitated, filtered, and redissolved for further treatment.
- Aluminium is separated from iron and other elements through selective precipitation.
- The aluminium complex reacts with EDTA, which is later titrated with zinc acetate in the presence of indicators.
Reagents and Apparatus
- Includes hydrofluoric acid, perchloric acid, nitric acid, sulfuric acid, ammonia solution, sodium hydroxide, EDTA solution, zinc acetate solution, xylenol orange, and phenolphthalein indicators.
- Use of standard laboratory glassware, pH meter, filters, and digestion crucibles is specified.
Sample Preparation
- Samples must be crushed to a maximum particle size of 160 µm and air dried.
- Precise weighing and digestion protocols are followed to ensure complete reaction and removal of interfering elements.
Titration and Calculation
- Titration endpoint detected by color change from yellow to crimson red with xylenol orange.
- Aluminium content is calculated using a formula relating titration volumes to sample mass.
- Permissible tolerances for parallel determinations are defined to ensure accuracy.

Applications

Quality Control in Mining and Processing
- Accurate measurement of aluminium content in chromium ores is essential for assessing ore quality and suitability for metallurgical processes.
- Helps optimize beneficiation procedures and ensures compliance with product specifications.
Environmental and Regulatory Compliance
- Monitoring aluminium in chromium concentrates aids in managing environmental impacts of mining operations.
- Ensures reporting standards align with international quality benchmarks.
Research and Development
- Provides a standardized analytical technique for laboratories conducting mineralogical and chemical investigations.
- Supports development of improved extraction and refining methods by reliable quantification of aluminium.

Related Standards

ISO 6629: Methods of chemical analysis for chromium ores and concentrates
- Provides general instructions and protocols for chemical testing related to chromium minerals.
- Read in conjunction with ISO 8889 for comprehensive analytical procedures.
Other ISO standards on complexometric titration and mineral analysis may complement the implementation of ISO 8889 depending on specific laboratory requirements.

Keywords: ISO 8889, aluminium content determination, chromium ores, complexometric method, EDTA titration, chemical analysis, chromium concentrates, aluminium analysis, mineral testing standard, laboratory procedure, metallurgical quality control.

Related standards

Mentioned in the description and other ISO standards

Abstract

Overview

Key Topics

Scope and Range
- Applicable for aluminium content between 1.5% and 20.0% (m/m).
- Suitable for chromium ores and concentrates analysis.
Principle of the Method
- Involves decomposition of the test sample with perchloric, nitric, and hydrochloric acids.
- Chromium is removed by distillation in the form of chromyl chloride.
- Insoluble residue is ignited, fused with sodium disulfate, and combined with the main solution.
- Hydroxides are precipitated, filtered, and redissolved for further treatment.
- Aluminium is separated from iron and other elements through selective precipitation.
- The aluminium complex reacts with EDTA, which is later titrated with zinc acetate in the presence of indicators.
Reagents and Apparatus
- Includes hydrofluoric acid, perchloric acid, nitric acid, sulfuric acid, ammonia solution, sodium hydroxide, EDTA solution, zinc acetate solution, xylenol orange, and phenolphthalein indicators.
- Use of standard laboratory glassware, pH meter, filters, and digestion crucibles is specified.
Sample Preparation
- Samples must be crushed to a maximum particle size of 160 µm and air dried.
- Precise weighing and digestion protocols are followed to ensure complete reaction and removal of interfering elements.
Titration and Calculation
- Titration endpoint detected by color change from yellow to crimson red with xylenol orange.
- Aluminium content is calculated using a formula relating titration volumes to sample mass.
- Permissible tolerances for parallel determinations are defined to ensure accuracy.

Applications

Quality Control in Mining and Processing
- Accurate measurement of aluminium content in chromium ores is essential for assessing ore quality and suitability for metallurgical processes.
- Helps optimize beneficiation procedures and ensures compliance with product specifications.
Environmental and Regulatory Compliance
- Monitoring aluminium in chromium concentrates aids in managing environmental impacts of mining operations.
- Ensures reporting standards align with international quality benchmarks.
Research and Development
- Provides a standardized analytical technique for laboratories conducting mineralogical and chemical investigations.
- Supports development of improved extraction and refining methods by reliable quantification of aluminium.

Related Standards

ISO 6629: Methods of chemical analysis for chromium ores and concentrates
- Provides general instructions and protocols for chemical testing related to chromium minerals.
- Read in conjunction with ISO 8889 for comprehensive analytical procedures.
Other ISO standards on complexometric titration and mineral analysis may complement the implementation of ISO 8889 depending on specific laboratory requirements.

ISO 8889:1988 PDF

Technical details

Abstract

Overview

Key Topics

Applications

Related Standards

Related standards

Abstract

Overview

Key Topics

Applications

Related Standards

Related standards

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