6830 International Standard (ISO INTE RNATIONAL ORGANIZATION FOR STANDARDIZATION MEXAYHAPOAHAH OPFAHM3AUMH nO CTAHAAPTW3ALWV+ORGANISATION INTERNATIONALE DE NORMALISATION Iron ores - Determination of aluminium content EDTA titrimetric method Minerais de fer -- Dosage de I'aluminium -- Methode titrimetrique a I'EDTA First edition - 1986-10-15 UDC 553.31 : 543.244.6 : 546.621 Ref. No. 1SO 6830-1986 (E) S0 6830-1986 (E) Descriptors : minerals and ores, iron ores, chemical analysis, determination of content, aluminium, vofumetric analysis. Price based on 8 pages Not for Resale Foreword iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. international organizations, govern- mental and non-governmental, in liaison with Iso, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the iso Council. They are approved in accordance with IsO procedures requiring at International Standard ISO 6830 was prepared by Technical Committee ISO/TC 102, Iron ores. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. @ International Organization for Standardization, 1986 Printed in Switzerland d without license from IHS Not for Resale INTERNATIONAL STANDARD ISO 6830-1986 (E) Iron ores - Determination of aluminium content EDTA titrimetric method Reagents 1 Scope and field of application 4 This Iinternational Standard specifies a titrimetric method using During the analysis, use only reagents of recognized analytical EDTA for the determination of the aluminium content of iron grade and only distiled water or water of equivalent purity. ores. 4.1 Sodium carbonate (Na2CO3), anhydrous. This method is applicable to a concentration range of 0,25 to 5,o % (m/m) of aluminium in natural iron ores, and iron ore concentrates and agglomerates including sinter products. 4.2 Sodium peroxide (Na202), dry. 2 References 4.3Nitric acid, g 1,40 g/ml. ISO 385/1, Laboratory glassware - Burettes - Part 1: General requirements. 4.4Hydrochloric acid, 1,16 to 1,19 g/ml. Iso 3081, Iron ores - Increment sampling - Manual method. 4.5 Hydrochioric acid, g 1,16 to 1,19 g/ml diluted 1 + 5. Iso 3082, Iron ores - Increment sampling and sample prepara- tion - Mechanical method. 1) 4.6 Hydrochloric acid, @ 1,16 to 1,19 g/ml diluted 1 + 1. Iso 3083, Iron ores - Preparation of samples - Manual method. 4.7 Ammonia, solution. ISo 7764, Iron ores -- Preparation of predried test samples for Ammonia (g 0,880 to 0,890 g/ml) diluted 1 + 1. chemical analysis. 4.8 Ammonium chloride (NH4Cl), 10 g/l solution contain- 3 Principle ing 2 drops (0,1 ml) of ammonia solution per 100 ml. Fusion of a test portion, in a vitreous carbon or zirconium cruci- ble, with a mixed flux of sodium carbonate and sodium perox- Cupferron (nitrosophenylhydroxylamine ammonium 4.9 ide. Dissolution of the cooled melt in 'hydrochloric acid salt) [CgHgN(NO)ONH4l, 60 g/I solution. precipitation of R2O3 with ammonia solution, filtration and redissolution of the hydroxides in hydrochloric acid. Prepare this solution in cold (< 20 oC) water on the day of use. Filter through a rapid paper and cool to 10 oC. Treatment with cupferron and. chloroform, extraction of elements such as iron and titanium and rejection of the organic phase. Treatment of the aqueous phase with nitric and per- 4.10 Chloroform. chloric acids, evaporation, treatment with hydrochloric acid, dilution and filtration. 4.11 Perchioric acid, 1,