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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 1700°C. 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. Coefficient of thermal extension (volume): 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 centrifuge to get 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 always been an interesting topic from the 1920s to 1940s.
Powder that is white to slightly yellow. It becomes crystals when it is heated with H2S gas. The a variation is a hexagonal colorless crystal with a density 3.98g/cm3 with a melting point at 1700degC. While the b variant has a density 4.102g/cm3, it is converted to the a form at 1020degC. They are found in sphalerite. Insoluble when water is used. Soluble in acid. You can see the sun dimmed.
In humid air, it can be converted to zinc sulfurate over a prolonged period of time. It is usually 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. Each bag (drum) weighs in at 50kg and 25kg respectively. Keep the drums in a well ventilated, dry place. Avoid open storage. To avoid moisture, the container should be sealed. It must not be transported with any food 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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