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Introduction to the characteristics and production methods of nickel hydroxide

wallpapers Tech 2020-08-11
Nickel hydroxide (nickelous hydroxide), chemical formula Ni(OH)2. The molecular weight is 92.71. It is a light green crystalline powder, soluble in acids, insoluble in water and alkali, soluble in ammonia, and ammonium salt aqueous solution to form complexes, and decomposes on heating. Nickel hydroxide is a reducing hydroxide.
 
It is a light green crystalline powder, soluble in acids, insoluble in water and alkali, soluble in ammonia, and ammonium salt aqueous solution to form complexes, and decomposes on heating.

Nickel hydroxide is a reducing hydroxide, which can react with some strong oxidants to form NiO(OH). It has strong alkalinity and is a medium-strong alkali. It can ionize a large amount in a saturated aqueous solution (5% by mass) OH- and a small amount of [Ni(OH)6]4-anion can also be dissolved in NaOH, KOH and other strong bases to form Na4[Ni(OH)6] or K4[Ni(OH)6], and Na4NiO3 is obtained after evaporation Easily hydrolyzed salt.

Product Usage

1. The raw material for making nickel salt, electroplating nickel;

2. Used to make alkaline storage batteries, catalysts, etc.

Properties and stability

At a specific temperature, it can be oxidized by bromine water, chlorine water, sodium hypochlorite, etc. to produce black nickel oxyhydroxide NiO(OH). Non-combustible and highly irritating. It decomposes into NiO and H2O at 230°C. Soluble in ammonia, ethylenediamine, and acid. It can be used to prepare nickel salt, alkaline storage batteries, and nickel plating, etc., and can also be used as a catalyst.

Storage and transportation conditions

Store in a cold, ventilated warehouse. Keep away from fire and heat sources. Prevent direct sunlight. The package is sealed. It should be stored separately from oxidants and acids.

resolve resolution

1. Nickel salt method:

A nickel salt solution such as a nickel sulfate solution and a sodium hydroxide solution are reacted to obtain a nickel hydroxide product through crystallization and separation. The reaction equation is:

NiSO4+ 2NaOH = Ni(OH)2+ Na2SO4

2. Dissolve 25g KOH in 250mL water without CO2, and dissolve 60g Ni(NO3)2·6H2O in 250mL water. The KOH solution was added dropwise to the warm (about 35°C) Ni(NO3)2 solution under vigorous stirring. The obtained precipitate was washed several times with warm water without CO2, 5L each time, until the eluate was no longer alkaline. Then, wash once with 5L of very dilute ammonia water without CO2. Finally, wash with the same amount of warm water without CO2 as the first time; until the precipitation and eluate do not contain K+ and NO3-. The precipitate is filtered out and dried in a vacuum dryer filled with concentrated sulfuric acid. The obtained product still contains adsorbed water, which can be heated to 200°C to remove it. The operations of precipitation, decanting, and filtration in this experiment must be carried out in an atmosphere free of CO2. [Ni(NH3)6](NO3)2 can also be used as raw materials, but NiCl2·6H2O and NiSO4·7H2O are not suitable, because the Cl- and SO42- in the precipitate are difficult to wash away.

Trunnano is one of the world's largest producers of nickel hydroxide nanomaterials. If you are interested, you can contact Dr. Leo by email: brad@ihpa.net.

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