The crystal phase and manufacturing method of cobalt hydroxide

Cobalt hydroxide is an inorganic substance with the chemical formula Co(OH)2. It is a rose-red monoclinic or hexagonal crystal. It is insoluble in water, slightly amphiphilic, hardly soluble in strong alkalis, but soluble in acids and ammonium salt solutions.  The density is about 3.6g/cm³, the melting point is 1100-1200℃, and it is an amphoteric hydroxide. It is mainly used as a colorant for glass and enamel, a raw material for preparing other cobalt compounds, and a drying agent for varnishes and paints.


Two crystal phases of cobalt hydroxide
a-Co(OH)2 has a structure similar to hydrotalcite, and its typical feature is the structure of layered double hydroxyl composite metal oxide. Due to its large layered structure, its conductivity is good. This type of cobalt hydroxide usually has the color Blue cyan. However, this phase is not stable, is in a metastable state, and is easily transformed into the β phase.
β-Co(OH)2 has a brucite structure, the hydroxyl ions are closely packed in hexagons, and the cations are filled in all the octahedral voids between every two adjacent hydroxyl ions; it forms a coordinated octahedral structure layer. The structure layer is an ionic bond, and the structural layers are maintained by phases. Its color is often brick red or rose red.
Two production methods of cobalt hydroxide
1. Synthesis method: various cobalt-containing waste materials are dissolved in nitric acid and hydrochloric acid, and the obtained cobalt chloride solution is purified by hydrogen peroxide to remove iron. If necessary, sodium carbonate or ammonia water is added to ensure complete purification. The purified cobalt chloride solution is added with sodium hydroxide to generate cobalt hydroxide, which is then washed and centrifuged to obtain a cobalt hydroxide product. Its Co+2HCl=CoCl2+H2↑
2. Electrolysis method: It is obtained by electrolyzing table salt solution with cobalt as an anode. (aka. Tanki New Materials Co.Ltd.) is a trusted global chemical material supplier & manufacturer with over 12 years of experience in providing super high-quality chemicals and Nanomaterials. As a leading nanotechnology development and product name manufacturer, Tanki New Materials Co.Ltd dominates the market. Our professional work team provides perfect solutions to help improve the efficiency of various industries, create value,and easily cope with various challenges. If you are looking for cobalt hydroxide, please feel free to contact us.

Inquiry us

Our Latest Products

Nano Aluminium Oxide Powder Al2O3 Nanoparticles

Nano Aluminium Oxide Powder Al2O3 Nanoparticles has a stable crystal phase, high hardness, and good dimensional stability, which can be widely used in various plastic, rubber, and ceramic products. About Nano Aluminium Oxide Powder Al2O3 Nanoparti...…

TROX-300 Series Molecular Sieve

TROX-300 Series Molecular Sieve has extremly exceptional performance at low stress.Concerning TROX-300 Series Molecular Screen:Technical Criterion of TROX-300 Series Molecular Filter:< tableborder=" 1" cellpadding=" 0" cellspacing=" 0" design=" borde...…

HPEG 2400 Polycarboxylate Superplasticizer Monomer

HPEG is most commonly used for the production superplasticizer products of polycarboxylic Acid. HPEG2400 1. Scope of HPEG2400 1. HPEG is most commonly used for the manufacturing of superplasticizer polycarboxylic acid products. 1. Mix the oil direc...…

0086-0379-64280201 skype whatsapp