The standard divides industrial sodium sulfide products into three categories:
Category 1 is ordinary sodium sulfide (commonly known as red alkali);
Category 2 is low-iron sodium sulfide (commonly known as yellow alkali);
Category 3 is high content of sodium sulfide
Ordinary sodium sulfide (enterprise standard)
▼▲
Indicator name
Indicator
Sodium sulfide
Na2S
≥ 50 ~ 60 %
Sodium Sulfite
Na2SO3
≤ 5.0 %
Iron
Fe
≤ 0.15 % (1500ppm)
Water-insoluble matter content
–
≤ 0.4 %
Appearance
–
Brown-red flakes and granules
Low iron sodium sulfide (enterprise standard)
▼▲
Indicator name
Indicator
Sodium sulfide
Na2S
≥ 50 ~ 60 %
Sodium sulfite
Na2SO 3
≤ 2.00 %
Sodium thiosulfate
Na2S2O3
≤ 2.00 %
Iron
Fe
≤ 0.015 % (150ppm)
Sodium carbonate
Na2CO 3
≤ 2.00 %
Water-insoluble matter content
–
≤ 0.20 %
Appearance
–
Yellow flakes and granules
Low iron sodium sulfide (enterprise standard)
▼▲
Indicator name
Indicator
Sodium sulfide
Na2S
≥ 50 ~ 60 %
Sodium sulfite
Na2SO 3
≤ 2.00 %
Sodium thiosulfate
Na2S2O3
≤ 2.00 %
Iron
Fe
≤ 0.012 % (120ppm)
Sodium carbonate
Na2CO 3
≤ 2.00 %
Water-insoluble matter content
–
≤ 0.20 %
Appearance
–
Yellow flakes and granules
Low iron sodium sulfide (enterprise standard)
▼▲
Indicator name
Indicator
Sodium sulfide
Na2S
≥ 50 ~ 60 %
Sodium sulfite
Na2SO 3
≤ 1.00 %
Sodium thiosulfate
Na2S2O3
≤ 2.00 %
Iron
Fe
≤ 0.01 % (100ppm)
Sodium carbonate
Na2CO 3
≤ 2.00 %
Water-insoluble matter content
–
≤ 0.05 %
Appearance
–
Yellow flakes and granules
Low iron sodium sulfide (enterprise standard)
▼▲
Indicator name
Indicator
Sodium sulfide
Na2S
≥ 50 ~ 60 %
Sodium sulfite
Na2SO 3
≤ 2.00 %
Sodium thiosulfate
Na2S2O3
≤ 2.00 %
Iron
Fe
≤ 0.008 ≤ 0.5 %
Sodium carbonate
Na2CO3
≤ 2.00 %
Sodium sulfate
Na2SO 4
≤ 1.00 %
Water-insoluble matter content
–
≤ 0.05 %
Density
–
≤ 0.5 %
Appearance
–
Light yellow particles
High content of sodium sulfide (enterprise standard)
▼▲
Indicator name
Indicator
Sodium sulfide
Na2S
≥ 65-70 %
Sodium carbonate
Na2CO3
≤ 5.0 %
Iron
Fe
≤ 0.15 % (1500ppm)
Water-insoluble matter content
–
≤ 0.40 %
Appearance
–
≤ Brown-red solid
Liquid sodium sulfide (enterprise standard)
▼▲
Indicator name
Indicator
Sodium sulfide
Na2S
≥ 30 %
Iron
Fe
≤ 0.15 % (1500ppm)
Sodium carbonate
Na2CO 3
≤ 3.0 %
Water-insoluble matter content
–
≤ 0.4 %
Sodium sulfide
Na2S
≥ 30 %
Iron
Fe
≤ 0.15 % (1500ppm)
Sodium carbonate
Na2CO 3
≤ 3.0 %
Water-insoluble matter content
–
≤ 0.4 %
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