Industrial use of sodium sulfide involves more complex scenarios. In dye workshops, workers operate in chemical-resistant suits because sodium sulfide releases toxic gases at high temperatures. Wastewater treatment plants often use it to precipitate heavy metals, requiring strict control of the feeding rate and equipping feed pipes with anti-crystallization devices. In paper mills, where it is used to soften wood pulp, the operating area must be kept dry, with anti-slip mats on the floor and warning signs such as “No Water Cups Allowed” posted on the walls.

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