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Cobalt sulfate is rose red crystal. After dehydration, it is red powder, soluble in water and methanol, and slightly soluble in ethanol. Cobalt sulfate is used for ceramic glaze and paint drier, it is also used for electroplating and alkaline batteries. Cobalt sulfate is used in the production of cobalt containing pigments and other cobalt products. It is also used in catalysts, analytical reagents, feed additives, tire adhesives, lithopone additives, etc.
In October 27, 2017, the WHO International Cancer Research Institute published a list of carcinogens, cobalt sulfate and other soluble cobalt (II) salts in the list of 2B carcinogens.
Basic information of cobalt sulfate (CAS 10124-43-3)
- Product Name: Cobalt Sulfate
- Synonyms: Bieberite; Cobalt(II) sulfate (1:1) heptahydrate; Cobaltous sulfate, heptahydrate; Cobalt(II)Sulfate Heptahydrate; Cobalt monosulfate, heptahydrate; Cobalt sulfate, 7-hydrate; COBALT SULFATE, 99.999%; Sulfuric acid, cobalt salt, heptahydrate; sulfuric acid, cobalt(2+) salt (1:1), heptahydrate; Cobaltous sulfate; Cobalt sulphate; cobalt(2+) sulfate; cobalt(2+) sulfate hydrate (1:1:7); cobalt(2+) sulfate hydrate (1:1:1); COBALTOUS SULPHATE 7H2O
- CAS NO.: 10124-43-3
- EINECS No.: 233-334-2
- Molecular Formula: CoSO4·7H2O
- Molecular Weight: 281.1
- Appearance and Character: Rose red monoclinic crystal
- Melting Point (℃): 96-98
- Boiling Point (℃): 420 (-7H2O). When heated to 420 C, the crystallized water is lost, and cobalt sulfate is easy to be weathered in air.
- Relative Density (water =1): 1.948 (25 ℃)
- Solubility: Soluble in water, methanol, slightly soluble in ethanol.
Functions and uses of cobalt sulfate (CAS 10124-43-3)
- In the paint industry, cobalt sulfate is used as a paint drying agent.
- In the ceramic industry, cobalt sulfate can be used as a glaze medicine for color porcelain.
- In the chemical industry, cobalt sulfate is used for making cobalt containing pigments and as raw materials for the production of cobalt salts.
- In the battery industry, cobalt sulfate can be used as an additive for alkaline batteries and lithopone.
- In addition, cobalt sulfate is also used as a catalyst and an analytical reagent.
- Cobalt sulfate can be used for cobalt plating, battery, cobalt pigment, ceramic, enamel, glaze and used as catalyst, foam stabilizer and drier.
Preparation methods of cobalt sulfate
Method one
Cobalt is dissolved in mixed acids of sulfuric acid and nitric acid (about 4:1). When the mass fraction reaches 22%-23%, heat directly to the boiling point with steam.
When the mass fraction reaches 43%-44%, the product can be crystallized for 3-4 days and the finished product is obtained by centrifugation. The mother liquor mass fraction exceeds 30%, adding 35%-36% sulfuric acid solution and a small amount of nitric acid to dissolve the cobalt.
3Co+2HNO3+3H2SO4→3CoSO4+2NO2↑+4H2O
2NO+O2→2NO2↑
Method two
Dissolving cobalt oxide with sulfuric acid, the solution is evaporated, crystallized, centrifuged and dehydrated, cobalt sulfate is made.
CoO+H2SO4→CoSO4+H2O
Handling and storage of cobalt sulfate
Handling precautions
Closed operation, local air exhaust. Prevent dust from releasing into the air of the workshop. Operators must undergo special training and strictly abide by the rules of operation. It is recommended that operators wear self-priming filter respirators, wear chemical safety glasses, wear rubber acid and alkali resistant clothing, and wear rubber acid and alkali resistant gloves. Avoid producing dust. Equipped with leakage emergency treatment equipment. The empty container may remain harmful.
Precautions for storage
Store in a cool, ventilated storeroom. Stay away from fire and heat. Prevent direct sunlight. The packing must be sealed and not dampened. Cobalt sulfate should be stored separately from food chemicals and must not be mixed up. The storage area should be equipped with appropriate material for leakage collection.