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Removal of Zn or Cd and cyanide from cyanide electroplating wastes

Patent ·
OSTI ID:862841
 [1]
  1. Knoxville, TN
+ Show Author Affiliations
A method is described for the efficient stripping of stable complexes of a selected quaternary amine and a cyanide of Zn or Cd. An alkali metal hydroxide solution such as NaOH or KOH will quantitatively strip a pregnant extract of the quaternary ammonium complex of its metal and cyanide content and regenerate a quaternary ammonium hydroxide salt which can be used for extracting further metal cyanide values.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
Assignee:
United States of America as represented by United States Energy (Washington, DC)
Patent Number(s):
US 4026790
OSTI ID:
862841
Country of Publication:
United States
Language:
English

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Related Subjects

/423/210/
alkali
alkali metal
amine
ammonium
ammonium hydroxide
cd
complex
complexes
content
cyanide
described
efficient
electroplating
extract
extracting
hydroxide
hydroxide solution
koh
metal
metal hydroxide
method
naoh
oxide solution
pregnant
quantitatively
quaternary
quaternary ammonium
regenerate
removal
salt
selected
solution
stable
stable complexes
strip
stripping
values
wastes
zn