Quality standards for non-national standard industrial sodium sulfide products of the People’s Republic of China_Kain Industrial Additives

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　%