What is zinc sulfide and its properties?


Apr 3, 2023 ,

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What is zinc sulfuride? Zinc sulfide This inorganic compound has a chemical composition of ZnS. It is a yellow or white powder and turns darker when it is visible. It is stable when placed in dry air. However, if the air is humid or contains moisture, it will eventually oxidize to zinc sulfurate.
There are two forms of zinc sulfuride crystals. Type A zinc sulfuride is a colorless hexagonal, crystalline powder. It can also be white to offwhite or yellow. The relative density is 4.0887. The melting temperature is 1700degC. Thermal conductivity 25.1 (w/(m/K), thermo expansion coefficient (volume), 100, 0.163, 200, 0.395, 400, 0.919 and 800, 2.146. A cubic crystal of B-type Zinc Sulfide is available. It is available in white, off-white, and yellow powders. The melting point of the powder is l700degC, while its relative density is 4.102. The coefficient of thermal expansion (volume), is 100degC (0.156), 200degC (0.386); 400degC (0.898); 800degC (1.996). It can be slowly oxidized into sulfate in air. The crystal form transition temperature of 1020°C. Soluble in dilute mineral acid. Insoluble in water
Preparation of zinc sulfuride
Double decomposition technique: add zinc solution under stirring to produce the metathesis reaction. Ammonium Sulfide is then removed by filtration. Concentrate the product by evaporation, cool to crystallize and then centrifuge to extract the sulfide Zinc.
Zinc sulfide has the following physical and chemical properties
Since Sidot, a French chemist, discovered zinc sulfide fluorescent substances in 1868 it has been studied for more than 130 year. The study of zinc sulfuride materials has been at the forefront of people’s minds from the 1920s until the 1940s.
Physical properties
Powder that is white to slightly yellow. When it is heated with H2S gas, it becomes crystals. The a variation is a hexagonal colorless crystal with a density 3.98g/cm3 with a melting point at 1700°C. While the b variant has a density 4.102g/cm3, it is converted to the a form at 1020°C. They are found in sphalerite. Insoluble when water is used. Soluble in acid. You can see the sun dimmed.
Chemical nature
In humid air, it can be converted into zinc sulfurate over a prolonged period of time. It is generally formed from the interaction of zinc salt solution with hydrogen sulfide. It can emit different colors of fluorescence if it is illuminated with a small amount Cu Mn, Ag, or by adding Mn, Cu, and Ag to activate the crystalline ZnS. As analytical reagents, coatings and paints, opaque and white glass, filling rubber, and plastics.

Zinc sulfide is used
Useful for photoconductor materials, analytical reagents, and phosphors It is also used for the production of dyes. As a coating for different filters and laser window.
Transport and storage of zinc sulfide.
Pack in barrels or woven bags lining with polyethylene bags. The drum or bag’s net weight is either 50kg (or 25kg). Keep the drums in a well ventilated, dry place. Avoid open storage. The container should be sealed to keep out moisture. It must not be stored or transported with any edible items or feed. Transport should include cover. Protect the package from the sun and rain by handling it carefully when unloading and loading. This product can be corrosive. poisonous. It can cause irritation to the skin. Operators should wear protective equipment and work clothes. The workshop must be well ventilated.

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