Removal of Zn or Cd and cyanide from cyanide electroplating wastes

Patent · Tue May 31 00:00:00 EDT 1977

OSTI ID:862841

Moore, Fletcher L ^[1]

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1. Knoxville, TN

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 (United States)
• 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

Related Subjects

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