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[Chemical Knowledge]：Properties and Uses of Sodium Sulfide

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Sodium sulfide (sulfide) is an important inorganic chemical raw materials, widely used in chemical industry, metallurgy, papermaking, leather, dyes and other industrial fields. This article will detail the properties and uses of sodium sulfide.

1. properties of sodium sulfide

1. physical properties of sodium sulfide
is white or pale yellow crystalline powder, pungent odor, soluble in water, the aqueous solution is strongly alkaline.

2. chemical properties of
sodium sulfide has a strong reduction, easy to be oxidized into sodium thiosulfate. At the same time, sodium sulfide can also react with many metal ions to generate the corresponding sulfide precipitation. In addition, sodium sulfide in aqueous solution will undergo hydrolysis reaction, the formation of sodium hydroxide and hydrogen sulfide.

2. the use of sodium sulfide

1. Leather tanning
Sodium sulfide is used as a tanning agent in the leather tanning process to make the leather soft, plump, shiny, and increase the water resistance and abrasion resistance of the leather.

2.
of the dye industry Sodium sulfide is used as a reducing agent and mordant in the dye industry for the manufacture of sulfur dyes and vat dyes.

3. Metallurgical industry
In the metallurgical industry, sodium sulfide is used as a precipitant to extract certain metals (such as copper, zinc, etc.).

4.
in the paper industry Sodium sulfide is used as a cooking agent additive in the paper industry to increase the strength and whiteness of the paper.

5. Petrochemical
In the field of petrochemical industry, sodium sulfide is used for desulfurization and dechlorination reactions to improve the quality of oil products.

6. water treatment agent
sodium sulfide can also be used as a water treatment agent for the removal of heavy metal ions and radioactive elements in water.

In short, sodium sulfide, as an important chemical raw material, is widely used in various fields. In the process of use, attention should be paid to its strong alkalinity and corrosiveness, and safety protection measures should be taken.

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