What are the reasons for the occurrence of gray alkali in soda ash production?
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What are the reasons for the occurrence of gray alkali in soda ash production?
Hydrogen sulfide enters the soda ash production process, forming insoluble iron-sulfur compounds (mainly ferrous sulfide), which causes the sodium bicarbonate to turn black； Iron ions are a prerequisite for the formation of color bases; the amount of hydrogen sulfide determines the color intensity of the color bases ； Excessive hydrogen sulfide leads to the formation of gray alkali; insufficient sodium sulfide, on the other hand, easily results in red alkali. 1# Song of the Desert
The high sulfur content in the alkali causes it to turn gray
Sulfur determines the chromaticity of alkali； If the amount of sodium sulfide is too high, gray alkali tends to form; if the amount is too low, red alkali (high-iron alkali) is likely to occur