The introduction of Coarse nickeloussulfate

Coarse nickeloussulfate
Chinese name: nickel sulfate
Foreign Name: Nickelous sulfate
Alias: the hexahydrate of nickel sulfate
Chemical formula: addition of NiSO4 · 6H2O
Appearance and properties: green crystals, the tetragonal system.
of pH: 4.5
Relative density: the 2.031,1.98 (water goods)
Melting point of 31.5 ℃.
Relative density (water = 1): 2.07
Boiling Point (℃): 840 (anhydrous)
Chemical properties
Α-type with six molecules of water of crystallization for the blue-green four-crystallization in the 533 ° C into the β-type green transparent crystal. 40 ° C, stable, blue opaque crystal at room temperature. With seven crystal water is emerald green transparent crystal. There are sweet and astringent taste. Slightly weathered. About to lose 5-molecular crystal water at 100 ° C for the monohydrate, 280 ° C into a yellow-green anhydrous. The median lethal dose (rats, intraperitoneal) 500mg/kg. Carcinogenic potential. [2] [3] nickel sulfate anhydrous, hexahydrate, heptahydrate matter of three kinds, six water. Anhydrous yellow-green crystals, relative density 3.68. Soluble in water, soluble in alcohol, ether. 31.5 ~ 53.3 ° C crystallization of hexahydrate of nickel sulfate hexahydrate is fine crystal blue or emerald green, the relative density of 2.07. Soluble in water, acidic aqueous solution. Soluble in concentrated ammonia (the formation of nickel ammonium ion), but little solubility in organic solvents (a common problem of sulfate, the lattice energy of the large end). 280 ° C loss of all water of crystallization, 840 ° C begins to decompose, releasing sulfur trioxide into the nickel oxide. Lower than 31.5 ° C crystallization of nickel sulfate heptahydrate, and heptahydrate things green transparent crystals, sweet and astringent, slightly vulnerable to weathering, the relative density of 1.948. Melting point of 98 ~ 100 ℃. 103 ° C lost 6 crystal water. Soluble in water and ethanol, easily deliquescence. Nickel sulfate exposure to dust Mo and organic matter, and sometimes can cause a fire or explosion. Toxic air in the maximum allowable concentration 0.5mg/m3.
Function and use
Coarse nickeloussulfate is mainly used in electroplating, electroless nickel and electroless nickel, nickel salt, the source of nickel ion in the plating process, the dissociation of nickel ions and sulfate ions. Hardened oil production, oil hydrogenation catalyst. Pharmaceutical industry for the production of Vit C oxidation catalyst. Inorganic industry as the main raw material for the production of other nickel salts such as nickel ammonium sulfate, nickel oxide, nickel carbonate, etc.. Printing and dyeing industry found production of Phthalocyanine Blue complexing agent, used as a coal agent of vat dyes. In addition, can also be used for the production of nickel-cadmium batteries.
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