T/QHLM 02-2022 Industrial Sodium Carbonate

Scope

Scope: This document specifies the classification, requirements, test methods, inspection rules, marking, packaging, transportation, and storage of industrial sodium carbonate. This document applies to industrial sodium carbonate produced by the ammonia-alkali method using industrial salt or natural soda as raw materials. This product is mainly used in industries such as chemical, glass, metallurgy, papermaking, dyeing and printing, synthetic detergents, and petrochemicals. Main technical content: Project indicators Class I Class II Superior grade Superior grade First grade Passing grade Total alkali content (calculated as Na2CO3, on a dry basis) ω/ % ≥99.5 99.4 99.3 99.2 98.9 98.0 Total alkali content (calculated as Na2CO3, on a wet basis) aω/ % ≥98.5 98.1 98.0 97.9 97.5 96.7 Sodium chloride (calculated as NaCl, on a dry basis) ω/ % ≤0.25 0.30 0.60 0.70 0.90 1.20 Iron (Fe, on a dry basis) ω/ % ≤0.002 0.002 0.002 0.002 0.003 0.005 0.008 Sulfate (calculated as SO4, on a dry basis) ω/ % ≤0.03 0.03 ———— Water-insoluble matter ω/ % ≤0.02 0.02 0.02 0.03 0.10 0.15 Bulk density b/ (g/mL) ≥0.95 0.85 0.90 0.90 0.90 0.90 Particle size b 180μm sieve residue ω/ % ≥75.0 75.0 70.0 65.0 60.0 1.0 1.8mm sieve residue ω/ % ≤2.0 2.0 ———— a represents the content at the time of packaging. When delivering the product, the total alkali content of the product multiplied by the weight of the delivered product and divided by the weight of the product on the delivery list shall not be lower than this value. b represents the control indicators for heavy sodium carbonate.

Development Information

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