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
–
cyan particles
anhydrous sodium sulfide (corporate standard)
▼▲
indicator name
indicator
sodium sulfide
na2s
≥ 90-92 %
sodium carbonite+thiosulfate sodium
na2so 3十na 2s2o3
≤ 3 %
moisture
≤ 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 %
ont size=”2″>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 %