Nickel sulfate has no water, hexahydrate and
heptahydrate three kinds of commercial hexahydrate,
there are α- type and β- type two variants, the
former is blue tetra crystal, the latter is green
monoclinic crystal. According to the product
classification, it can be divided into
electroplating grade nickel sulfate and battery
grade nickel sulfate, the former is used in
electroplating industry and battery industry, is
the main nickel salt of electroplating nickel and
chemical nickel, is also the source of metal nickel
ion