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 ≤
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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