Recycle treatment of waste water from nickel plating

Patent · Tue Feb 22 04:00:00 EST 1977

OSTI ID:7224932

Hayashi, T

A method is described for the recycle treatment of nickel plating wastewater, in order to efficiently recover the nickel components from wastewater which has been used for the washing of nickel plated products in a form re-usable as a nickel plating solution as such, wherein the nickel plating wastewater is mixed with an aqueous alkaline component so as to remove, by precipitation in the form of hydroxides, contaminating metal ions other than nickel. The filtrate so obtained is treated through an ion exchange process so as to obtain an aqueous solution of nickel salts containing excess free sulfuric acid, a portion of which is then treated with alkali so as to precipitate nickel hydroxide which is separated in the form of nickel hydroxide through filtration by means of a centrifuge. The nickel hydroxide so obtained is then added to the rest of the aqueous nickel salt solution for neutralization with the free sulfuric acid contained therein to form nickel sulfate. The free sulfuric acid is then removed so as to obtain a highly concentrated nickel sulfate solution.

• Assignee: Kayabakogyo-Kabushiki-Kaisha
• Patent Number(s): US 4009101
• OSTI ID: 7224932
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
ELEMENTS
HYDROGEN COMPOUNDS
INDUSTRIAL PLANTS
INDUSTRY
LIQUID WASTES
MANAGEMENT
MATERIALS RECOVERY
METAL INDUSTRY
METALS
NICKEL
OXYGEN COMPOUNDS
PROCESSING
RECOVERY
RECYCLING
TRANSITION ELEMENTS
WASTE MANAGEMENT
WASTE PROCESSING
WASTE WATER
WASTES
WATER