What is zinc sulfide and its properties?
What does zinc sulfide mean?
This inorganic compound has the chemical formula ZnS. It's a powder that is either white or very slightly yellow. The color gets darker when it's viewed. It can be stored in dry air and will not oxidize if placed in moist air.
There are two types of crystal zinc sulfide. Type A is either a white, yellow or off-white hexagonal crystal powder. The relative density is 4.0887. The melting point of the wax is 1700°C. Thermal conductivity 25.1w/(m/K), thermal extension coefficient (volume: 100; 0.163; 200; 0.395; 40, 0.919 and 800; 2.146. A cubic crystal of zinc sulfide B is available. It is available in white, off-white and yellow powders. It has a relative density of 4.102 and a melting point at l700°C. Thermal expansion coefficient (volume): 100degC (0.156), 200degC (3.386); 400degC(0.898); 800degC (1.1996). Slowly oxidize it to form sulfate. 1020°C is the crystal form transition temperature. Soluble in dilute mineral acid. It is insoluble in water.
Making zinc sulfide
Double decomposition technique: add zinc solution under stirring, add ammonium Sulfide slowly to produce zinc oxide and ammonium succide, filter to remove ammonium, crystallize and then concentrate by evaporation.
The chemical and physical properties of zinc sulfuride
More than 130 years have passed since Sidot, a French chemist discovered zinc sulfide fluorescent substances. People have always been interested in studying zinc sulfide fluorescent materials, from the 1920s until the 1940s.
Powder that is white to slightly yellow. The powder can be made crystals by heating it with H2S. The a variation is a colored hexagonal crystal having a density 3.99g/cm3 at a melting point of 1705degC. While the b variant has a density 4.99g/cm3, it can be transformed to the a variant at 1020degC. They are found in sphalerite. Not soluble in water; soluble in acids. You can see the sun dimmed.
In humid conditions, zinc sulfate is formed. It generally comes from the reaction of zinc salt solution and hydrogen sulfide. It can produce different fluorescence colors if it is illuminated with a small amount Cu, Mn, or Ag. As analytical reagents or coatings for paints, opaque and white glass, filling rubber, and to prepare phosphors.
Zinc sulfide is used
Useful for photoconductor and analytical materials, as well as phosphors. You can also use it in the production of dyes. As a coating for different filters and laser window.
Transport and storage of zinc sulfide.
Pack in barrels and woven bags lined by polyethylene bags. A drum or bag can weigh 50kg (or 25kg) net. Keep the drums in an enclosed, dry place. Avoid storage outside. It must be tightly sealed in order to keep out moisture. The container should be sealed and not transported with any food items or feed. Transport should include cover. Protect the packaging from sun and rain by handling it carefully when unloading and loading. This product has corrosive properties. poisonous. It can cause irritation to the skin. Work clothes are required for operators. Protective gear is also recommended. Good ventilation is essential in the workshop.
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