Cobalt Sulfate Heptahydrate

Synonyms:Cobalt sulfate 7-hydrate, sulfuric acid cobalt (2+) salt heptahydrate, Cobalt monosulfate heptahydrate

Formula: CoSO4.7H2O

CAS NO.: 10026-24-1

M.W.: 281.10

Melting point: 206.2 ° F (NTP, 1992)

Water solubility: appreciable


Pink to red monoclinic prismatic crystals or red granular solid. Odorless. Become cobalt sulfate anhydrous at 788°F. Cobalt sulphate heptahydrate dehydrates on heating (41.5℃) to the cobalt sulfate hexahydrate and to the cobalt sulfate monohydrate at 71℃.


Cobalt sulfate heptahydrate is used in the preparation of pigments, as well as in the manufacture of other cobalt salts. Cobalt pigment is used in porcelains and glass. Cobalt(II) sulfate heptahydrate is used in storage batteries and electroplating baths, sympathetic inks, and as an additive to soils and animal feeds.

– Electroplating: Cobalt sulfate heptahydrate is used in electroplating processes to deposit a cobalt layer onto various metal surfaces.
– Catalyst: It serves as a catalyst in several chemical reactions.
– Pigment: Cobalt sulfate heptahydrate is utilized as a pigment in ceramics, paints, and inks.
– Agriculture: It is a source of cobalt for animal feed and fertilizer additives.


Stored in cool and dry warehouse; Keep away from flame and heat.

NO Item Specification
1 Co ≥21 ≥20
2 Ni ≤0.0008 ≤0.001
3 Fe ≤0.0005 ≤0.001
4 Cu ≤0.0003 ≤0.001
5 Mn ≤0.0005 ≤0.001
6 Zn ≤0.0003 ≤0.001
7 Ca ≤0.001 ≤0.002
8 Mg ≤0.001 ≤0.001
9 Na ≤0.0015 ≤0.002
10 Pb ≤0.001 ≤0.001
11 As ≤0.001 ≤0.001
12 Cl- ≤0.01 ≤0.02
13 Si ≤0.0025 ≤0.01
14 Water insoluble ≤0.01 ≤0.02


Packaging Sizes

25kg net. Double plastic bags lined plastic woven sack.


Cobalt sulfate has two types of crystal water and single crystal water. The seven crystal waters have about 21% cobalt content, while the single crystal water has a cobalt content of 33%. Cobalt sulfate in seven crystal waters is the main source of cobalt in the feed industry.

Under the microscope, the cobalt sulfate of the seven crystal waters is a light red large particle. In trace mineral premixes, such particles are readily identifiable. The salts of the single crystal form are smaller than the seven crystal forms. Therefore, it is more difficult to do parting. In addition, the integrity of crystallization will be destroyed after the loss of six molecules of crystal water for single crystal salts.