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[Chemical Knowledge]：Properties and Uses of Alkali Sulfide

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Alkali sulfide (also known as sodium sulfide) is an important inorganic chemical raw materials, widely used in chemical industry, metallurgy, medicine, agriculture and other fields. This paper will introduce the properties and uses of sulfide alkali in detail. The nature of

1. alkali sulfide

alkali sulfide is a white or light yellow crystalline powder with a strong pungent odor. It is easily soluble in water, and the aqueous solution is strongly alkaline. Alkali sulfide easily absorbs moisture and carbon dioxide in the air, generating sodium bicarbonate and sodium thiosulfate.

alkali sulfide has strong reducibility and can be oxidized by oxygen in the air to thiosulfate. In addition, alkali sulfide is also corrosive and toxic, and has an irritating effect on the eyes, skin and mucous membranes.

2. the use of alkali sulfide

1.

in the chemical field In the chemical field, alkali sulfide is mainly used in the production of sulfur dyes, vulcanized rubber, vulcanization accelerators, etc. Sulfur dyes are an important class of dyes, which have good light resistance, oxidation resistance, acid and alkali resistance, and are widely used in textile dyeing. Vulcanized rubber has excellent oil resistance, heat resistance, acid and alkali resistance, and is widely used in machinery, automobiles, aviation and other fields.

2.

in the field of metallurgy In the field of metallurgy, alkali sulfide can be used as a desulfurizer for extracting metals. For example, in the process of extracting zinc, alkali sulfide can be used as a desulfurizer to convert sulfide in zinc ore into sulfate, so as to realize the separation of zinc and sulfur.

3.

in the field of medicine In the field of medicine, alkali sulfide can be used as an intermediate for the preparation of some drugs. For example, a sulfide base can be reacted with benzaldehyde to form benzoyl thiol, which is further reacted to form benzoic acid, a common pharmaceutical intermediate.

4.

in the field of agriculture In the field of agriculture, alkali sulfide can be used to improve acidic soils. The aqueous solution of alkali sulfide is strongly alkaline, which can adjust the pH value of the soil, improve the soil environment, and is conducive to the growth of crops.

In short, as an important inorganic chemical raw material, alkali sulfide is widely used in chemical industry, metallurgy, medicine, agriculture and other fields. When using alkali sulfide, it is necessary to pay attention to its corrosion and toxicity, and take necessary safety measures.

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