ELECTROLYSIS AND ION EXCHANGE FOR THE IN PROCESS RECYCLING OF COPPER FROM SEMI-CONDUCTOR PROCESSING SOLUTIONS
Description:
The objectives of the study are to develop an understanding of the electrodeposition of copper onto extended-area electrodes, and of the adsorption/desorption of copper onto ion exchange resins with a high affinity for copper. The principles elucidated in this work will pave the way for subsequent development of commercial-scale electrolysis/ion exchange processes for recovering copper throughout semiconductor fabrication plants.
Record Details:
Record Type:PROJECT(
ABSTRACT
)
Start Date:01/01/2002
Completion Date:12/31/2004
Record ID:
54428
Keywords:
WATER, HEAVY METALS, EFFLUENT, ENVIRONMENTALLY CONSCIOUS MANUFACTURING.,
Related Organizations:
Role
:OWNER
Organization Name
:UNIVERSITY OF CALIFORNIA - BERKELEY
Citation
:Berkeley
State
:CA
Zip Code
:94720
Project Information:
Approach
:Four investigations are planned. These are:
(1) Laboratory scale electrochemical investigations using a rotating copper
electrode to determine kinetic parameters and the nature of the electrodeposit
for the solutions of interest. These tests will identify any side-reactions, and
determine mass-transfer parameters that will influence the future design of
commercial cells.
(2) Application of various extended surface area electrodes to solutions
representative of semiconductor industry wastes. Experimental cells will be
built to examine the effects of electrode area, (superficial) current density,
electrolyte flowrate and time of electrolysis on cell voltage, current
efficiency, ultimate copper concentration and the morphology and purity of the
electrodeposited copper.
(3) Measurement of sorption and desorption isotherms for metals on chelating
resins and those with a strong affinity for copper. Isotherms will be measured
in solutions of different chemistries, and related to the thermodynamic
speciation.
(4) Development of a model for uptake and selectivity of metals onto resins,
to guide commercial development of effective ion exchange units.
Cost
:$325,000.00
Research Component
:Pollution Prevention/Sustainable Development
Project IDs:
ID Code
:R829627
Project type
:EPA Grant