Manufacturing process for nickel (II) hydroxide
US4390447A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 20, 1981 |
| Grant date | Jun 28, 1983 |
| Priority date | — |
| Expiry date | Jul 20, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A manufacturing process for nickel (II) hydroxide suitable as active positive electrode material in alkaline electrochemical cells transforms solid Ni(NO.sub.3).sub.2 directly into Ni(OH).sub.2 using sodium hydroxide and with the least possible homogeneous solute phase of Ni.sup.2+ ions. Ni(NO.sub.3).sub.2 is deposited on the lower end of a diagonally upward moving conveyor belt, to which concentrated NaOH is supplied from the opposite direction. The depressions in the conveyor belt, which prevent downward sliding of the reaction product, discharge at the upper end Ni(OH).sub.2, together with easily separable NaNO.sub.3. At the lower end, the used NaOH is discharged. It can be reconcentrated, after separation of entrained NaNO.sub.3, in a vacuum evaporator and reused. The intermediate products of the process are basic nickel nitrates, for example of the composition Ni(NO.sub.3).sub.2 .times.Ni(OH).sub.2 .times.6H.sub.2 O.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.