Cobalt Compounds

Cobalt Compounds:

1. Cobalt oxide: usually cobalt oxalate or cobalt carbonate as raw materials calcined at 500-600 ℃ cobalt oxide, the main reaction is as follows:

CoC2O4 == CoO + CO + CO2; CoCO3 == CoO + CO2

2. Cobalt hydroxide: It can usually be neutralized with sodium hydroxide solution in cobalt chloride solution or cobalt sulfate solution. The main reactions are as follows:

Co2 ++ 2OH - == Co (OH) 2 Co (OH) 2 + O2 + 2H2O == 4Co (OH) 3

3. Cobalt chloride: usually available cobalt powder with dilute hydrochloric acid into cobalt chloride solution, and then crystallized by evaporation of cobalt chloride crystals, the main reaction is as follows: Co + HCl --- COCl2; Co + H2SO4 --- COSO4

4. Cobalt sulfate: usually cobalt oxide as raw material, dissolved in Sulfuric Acid after evaporation crystallization of pink cobalt sulfate crystals, the main reaction is as follows: CoO + H2SO4 == CoSO4 + H2O

5. Cobalt carbonate: It can usually be obtained by precipitation with sodium carbonate solution in cobalt chloride solution or cobalt sulfate solution. The main reactions are as follows:

CoCl2 + Na2CO3 == CoCO3 + 2NaCl

6. Cobalt oxalate: It can usually be precipitated with ammonium oxalate solution in cobalt chloride solution or cobalt sulfate solution. The main reactions are as follows:

(NH4) 2C2O4 + CoCl2 == CoC2O4 + 2NH4Cl

7. Oxidation of high cobalt: cobalt carbonate or cobalt oxalate can usually be heated in oxygen, further oxidation obtained, the main reaction is as follows:

3CoCO3 + O2 ==== Co2O3 ++ CO2; CoC2O4 + O2 ==== Co2O3 + CO2 + CO

8. Cobalt Hydroxide: 4Co (OH) 2 + O2 + 2H2O === 4Co (OH) 3; 2Co (OH) 2 + NaClO + H2O == 2Co (OH) 3 +

2Co (OH) 3 + 6HCl == 2CoCl2 + Cl2 + 6H2O