Physical and chemical properties of zinc sulfide
Zinc sulfide, chemical formula ZnS. The chemical bond property between Zn and S is inclined to covalent bond type. The crystal has three different configurations: low-temperature Type, namely sphalerite structure, which is abundant in nature. Colorless cubic crystal, Zn, S coordination number are all 4, the relative density is 4.10, and it turns to high-temperature Type at 1020 ℃; High-temperature Type, namely wurtzite structure, colorless hexagonal crystal, Zn, S coordination number are all 4, relative density is 3.98, melting point is about 1700 ℃, which is the high-temperature stable structure of sulfur chemical book zinc; High-pressure Type, i.e., sodium chloride structure, with Zn and S coordination number of 6 and relative density of 5.21. There is also an aqueous compound ZnS · H2O, a white powder with a relative density of 3.98 and a melting point of 1049 ℃. Zinc sulfide is insoluble in water, dilute alkali, and acetic acid, but it is easily soluble in a low concentration of strong acids such as hydrochloric acid, releasing hydrogen sulfide. The solubility product of zinc sulfide is close to the K1 · K2 value of hydrosulfuric acid, so the following balance exists in dilute acid: Zn2++H2S=2H++ZnS. It can be seen that in a strongly acidic zinc salt solution when hydrogen sulfide gas is introduced, zinc sulfide precipitation cannot be obtained. In a zinc salt solution, hydrogen sulfide gas is introduced to receive zinc sulfide precipitation, but the rain is incomplete. Using ammonium sulfide solution as a precipitant can ultimately precipitate zinc ions in the zinc salt solution into zinc sulfide. Due to the alkalinity of the ammonium sulfide solution, the acidity of the system can be reduced. The above method is used for industrial production and needs to be operated in an isolated air environment. Chemical book white zinc sulfide darkens when exposed to light and is easily oxidized into zinc sulfate in the air. Zinc sulfide, or when mixed with zinc oxide, can be used as a white paint pigment. Pure zinc sulfide does not emit light. Suppose trace amounts of manganese, copper, and silver are added as activators to zinc sulfide crystals. In that case, they can talk about different fluorescence colors after light irradiation, called fluorescent powder, and used for making fluorescent screens and luminescent paints. Zinc sulfide is also used in the leather, enamel, rubber, and dyes industries. If you are looking for high quality, high purity and cost-effective zinc sulfide, or if you require the latest price of zinc sulfide, please feel free to email contact mis-asia.