Zinc Sulphate heptahydrate 21% agricultural Grade 1)ZnSO4.7H2O%,98%;Zn,22% 2)Package,50kg/bag 3)Use,minerals&trace element

Zinc Sulphate heptahydrate 21% agricultural Grade

Molecular Formula:

        ZnSO4. (x) H2O (x=1 or 7) Molecular Weight:

        179.47 (x=1) , 287.56 (x= 7) (According to the 1997 international relative atomic mass)Properties:

        Colourless crystal; gradually weathering in the dry air ,dissolved in their own csystallization water(39°C),into monohydrate(100°C).Losed all crystal water (250-280°C),decomposed at 500oC above;.Easily dissolve in water, insoluble in ethanol, aqueous solution is acidic;.pH=4.5,the appearance of monohydrate zinc sulphate is white powder.Use:

        It is used for the manufacture of lithopone and other zinc salts mainly ; as important auxiliary materials for viscose and vinylon fiber . used for electroplating, mordants, wood and leather save agents ,bone glue clarify save agents,electronic components,emetics,medical microbicides, prevent fruit tree seedings diseases, dispose circulating cooling water, used in nonferrous metal mineral flotation,as feed and food additiveas , as trace element fertilizers agriculturally etc.

Item	Zinc sulphate monohydrate		Zinc sulphate heptahydrate
			Feed grade	Technical grade
Zinc sulphate (ZnSO4) %≥	94.7	96	97.3	98
Zn %≥	34.5	35	22	22.15
Arsenic%≤	0.0005	0.0005	0.0005	0.0005
Pb %≤	0.002	0.002	0.001	0.001
Cd %≤	0.003	0.003	0.002	0.002
Fineness (through 250umtest sieve) ≥	95	95	-	-
Fineness (through 800umtest sieve) ≥	-	-	95	-

Feed grade standard: 2934-2000

Zinc Sulphate heptahydrate 21% agricultural Grade