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ISO 4280 : 1977

Cryolite, natural and artificial, and aluminium fluoride for industrial use — Determination of sulphate content — Barium sulphate gravimetric method

Standard Details

Applicable to products having a content, expressed as sulphur trioxide, equal to or more than 0.1 % (m/m). Bases on alkaline fusion of a test portion with a mixture of sodium carbonate and boric acid. Extraction of the fused mass with perchloric acid solution and precipitation of the sulphate ions with barium chloride in an acidified medium. Filtration on a fine-texture, ashless filter paper (pore diameter approximately 0.4 to 1.0 m). Calcination after drying in an electric oven at (850 20) °C. Weighing of the residue.

General Information

Status : Published
Standard Type: Main
Document No: ISO 4280 : 1977
Document Year: 1977
  • Section Volume:
  • ISO/TC 226. Materials for the production of primary aluminium

Life Cycle

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ISO 4280 : 1977
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