SIST EN 28343:2009

Ferronickel - Determination of silicon content - Gravimetric method (ISO 8343:1985)

Specifies a method for the determination of silicon in ferronickel in the range 0,2 to 4,0 % (m/m). Gives principle, reagents, apparatus, sampling and samples, procedure, expression of results and test report.

Ferronickel - Bestimmung des Siliziumgehalts - Gravimetrisches Verfahren (ISO 8343:1985)

Ferro-nickel - Dosage du silicium - Méthode gravimétrique (ISO 8343:1985)

La présente Norme internationale spécifie une méthode gravimétrique de dosage du silicium dans les ferro-nickels à des teneurs comprises entre 0,2 et 4,0 % (m/m).

Feronikelj - Določevanje silicija - Gravimetrična metoda (ISO 8343:1985)

General Information

• Status: Published
• Publication Date: 23-Sep-2009
• ICS: 77.100 - Ferroalloys
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 14-Sep-2009
• Due Date: 19-Nov-2009
• Completion Date: 24-Sep-2009
• Ref Project: EN 28343:1991 - Ferronickel - Determination of silicon content - Gravimetric method (ISO 8343:1985)

Overview

EN 28343:1991 (ISO 8343:1985) specifies a gravimetric method for the determination of silicon content in ferronickel alloys. The procedure covers the analytical range 0.2 to 4.0 % (m/m) and describes principle, reagents, apparatus, sampling, procedure, result expression and test reporting. This standard is intended for routine laboratory analysis and quality control of ferronickel and other nickel-bearing ferroalloys.

Key topics and technical requirements

• Analytical principle: dissolution of a test portion in nitric and perchloric acids, dehydration to insoluble silica, filtration and calcination, volatilization of silica with hydrofluoric and sulfuric acids, and gravimetric determination by difference.
• Test portion sizes (depending on expected Si content):

  • 1 % Si: 2.00 g (±0.001 g)

  • 0.25 – 1 % Si: 4.00 g (±0.002 g)
  • < 0.25 % Si: 10.00 g (±0.005 g)
• Required apparatus:
  • 600 ml high-form beaker, 40 ml platinum crucible, 125 mm folded filter (medium porosity)
  • Muffle furnace capable of 1100 °C, desiccator, standard laboratory glassware
• Reagents (analytical grade): nitric, perchloric, hydrochloric, hydrofluoric, sulfuric acids and distilled water.
  • Warnings: perchloric acid can form explosive mixtures with organics; hydrofluoric acid is highly corrosive and toxic. Use appropriate fume hoods and PPE.
• Procedure highlights:
  • Perform a blank in parallel.
  • Heat to produce perchloric acid fumes and crystallized residue, dissolve salts, filter and wash thoroughly to remove perchloric acid before incineration.
  • Calcine precipitate at 1100 °C until constant mass, treat with H2SO4 and HF, re-calcine and weigh residues.
• Calculation:
  • Silicon (%) = 0.467 × (m1 − m2 − m3) × 100 / m0
    where m0 = test portion mass; m1 = mass of crucible + impure silica; m2 = mass of crucible + residual impurities; m3 = silica from the blank.
• Precision: precision was evaluated in a limited interlaboratory programme and repeatability/reproducibility are determined per ISO 5725.

Applications and users

• Who uses it: metallurgical laboratories, ferroalloy producers, nickel alloy manufacturers, quality control and certification labs, and standards organizations.
• Practical uses:
  • Routine quality control of ferronickel shipments and production batches
  • Verification of compliance with material specifications
  • Analytical reference method for establishing or validating faster instrument-based methods (e.g., XRF, ICP)

Related standards

• ISO 8343:1985 (identical international edition)
• ISO 5725 - Precision of test methods (repeatability and reproducibility)
• CEN/CEN-member adoption references (EN 28343)

Keywords: EN 28343:1991, ISO 8343:1985, ferronickel, silicon determination, gravimetric method, laboratory analysis, muffle furnace, hydrofluoric acid, perchloric acid, quality control.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Ferronickel - Bestimmung des Siliziumgehalts - Gravimetrisches Verfahren (ISO 8343:1985)Ferro-nickel - Dosage du silicium - Méthode gravimétrique (ISO 8343:1985)Ferronickel - Determination of silicon content - Gravimetric method (ISO 8343:1985)77.100Železove zlitineFerroalloysICS:Ta slovenski standard je istoveten z:EN 28343:1991SIST EN 28343:2009en,de01-november-2009SIST EN 28343:2009SLOVENSKI
STANDARD
International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.MEIK.4YHAPO~HAR OPl-AHM3ALWlR fl0 CTAHC1APTbI3ALWl@ORGANISATION INTERNATIONALE DE NORMALISATION Ferronickel - Determination od Silicon content - Gravimetric method Ferro-nicke/ - Dosage du silicium - NIethode gravimh trique First edition - 1985-10-15 UDC 669.243.881 : 543.21 : 546.28 Ref. No. ISO 83434985 (E) Descriptors : nickel, ferronickel, Chemical analysis, determination of content, Silicon, gravimetric analysis. Price based on 2 pages SIST EN 28343:2009

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. Esch 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 least 75 % approval by the member bodies voting. International Standard ISO 8343 was prepared by Technical Committee ISO/TC 155, Nickel and nicke1 alle ys. 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. 0 International Organkation for Standardkation, 1985 Printed in Switzerland SIST EN 28343:2009

INTERNATIONAL STANDARD ISO 8343-1985 (E) Ferronickel - Determination of Silicon content - Gravimetric method 1 Scope and field of application This International Standard specifies a gravimetric method for the determination of Silicon in ferronickel in the range 0,2 to 4,0 % b7?lmL 5 Apparatus Ordinary laboratory apparatus, and 5.1 Beaker, high form, of capacity 600 ml, unetched. 5.2 Platinum crucible, of capacity 40 ml. 2 Reference ISO 5725, Precision of tes t methods - Determination of repea tability and reproducibi&y b y in ter-labora tory tests. 3 Principle Dissolution of a test Portion in nitric acid and addition of per- chloric acid. Formation of insoluble silica by dehydration in perchloric acid, filtration, and weighing of the calcined pre- cipitate. Volatilization of the silica with hydrofluoric and sulfuric acids, weighing of the residue, determination of the silica by differente and calculation of the Silicon content. 4 Reagents During the analysis, unless otherwise stated, use only reagents of recognized analytical grade and only distilled water or water of equivalent purity. 4.1 Hydrochlorit acid, e20 = 1,19 g/ml. 4.2 Hydrochlorit acid, e20 = 1,19 g/ml, diluted 1 + 9. 4.3 Hydrofluoric acid, e20 = 1,14 g/ml. WARNING - Hydrofluoric acid is extremely irritating and corrosive to skin and mucous membranes, producing severe skin burns which are slow to heal. In case of skin contact wash weil with water and seek medical advice. 4.4 Nitrit acid, @20 = 1,41 g/ml, diluted 1 + 1. 4.5 Perchlorit acid, c20 = 1,61 g/ml [70 % (mlm)]. 4.6 Sulfuric acid, ~20 = 1,83 g/ml, diluted 1 + 1. 5.3 Muffle furnace, capable of being maintained at 1100 OC. 5.4 Dessicator. 6 Sampling and samples 6.1 Sampling and preparation of the laboratory Sample shall be carried out by normal agreed procedures or, in case of dispute, by the relevant International Standard. 6.2 The laboratory Sample normally is in the form of granules, millings or drillings and no further preparation of the Sample is necessary. 6.3 If it is suspected that the laboratory Sample is con- taminated with oil or grease from the milling or drilling process, it shall be cleaned by washing with high purity acetone and dry- ing in air. 6.
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