Introduction to Mineral Processing & Extractive Metallurgy in Recycling

73 Pages·2007·11.07 MB·English

RReeccyycclliinngg TTeecchhnnoollooggiieess && CCoonnssiiddeerraattiioonnss
((IInnttrroodduuccttiioonn ttoo MMiinneerraall PPrroocceessssiinngg &&
EExxttrraaccttiivvee MMeettaalllluurrggyy iinn RReeccyycclliinngg))
Edgar E. Vidal and Patrick R. Taylor
Kroll Institute for Extractive Metallurgy
Colorado School of Mines
KIEM
G.S. Ansell Department of Metallurgical & Materials Engineering
WWhhyy SShhoouulldd CCoommppaanniieess RReeccyyccllee??
Computer Monitor
Recycling in China –
(cid:190) The bottom line is
Copyright Basel Action
Network
economics.
(cid:190) But in addition,
companies may
derive positive
benefits from
addressing both:
social responsibility
and sustainable
development issues.
KIEM
G.S. Ansell Department of Metallurgical & Materials Engineering
WWhhaatt TTeecchhnnoollooggyy iiss uusseedd iinn RReeccyycclliinngg??
(cid:190) Most recycle technology is
based upon our
understanding of both
mineral processing and
extractive metallurgy.
(cid:190) Innovative advances in both
technologies have been, and
are being, made to address
the unique resource
recovery problems
associated with both
recycling and waste
Computer Wire Recycling
minimization. in China (Copyright Basel
Action Network)
KIEM
G.S. Ansell Department of Metallurgical & Materials Engineering
DUST
EXHAUST TRUNK LINK COLLECTOR
EXHAUST
AIR
Fe
WIRE CROSSBELT
INPUT MAGNET
TWO DECK EXHAUST
SCREEN WASTE FAN
PRIMARY PRODUCT
GRANULATOR
CROSSBELT SECONDARY TERTIARY DUAL
MAGNET GRANULATOR GRANULATOR ASPIRATOR BIN
Fe
COPPER OR
ALUMINUM
DUST
GRAVITY
WWiirree PPrroocceessssiinngg SSyysstteemm
SEPARATOR
((SSyysstteemm FFlloowwsshheeeett))
TAILINGS
SCREENERS
TAILINGS
With
WASTE
STONER
Technology
RESIDUAL COPPER
CONCENTRATE
ALUMINUM COPPER
PRODUCT PRODUCT
KIEM
G.S. Ansell Department of Metallurgical & Materials Engineering
22000000 ppoouunndd ppeerr hhoouurr
MMeecchhaanniiccaall WWiirree
RReeccoovveerryy PPllaanntt
KIEM
G.S. Ansell Department of Metallurgical & Materials Engineering
SSoommee QQuueessttiioonnss
(cid:190) What information do we need to obtain relative
to a waste or recycle stream, both during the
design and operational phases?
(cid:190) Should we use mineral processing,
hydrometallurgy, electrometallurgy and/or
pyrometallurgy on a specific waste or recycle
stream?
KIEM
G.S. Ansell Department of Metallurgical & Materials Engineering
SSoommee QQuueessttiioonnss
(cid:190) What is “liberation” and why is it important?
(cid:190) Some materials do not require liberation for
metal recovery, in this case what is the concept
of “exposure”?
(cid:190) What specific qualities of a waste or recycle
stream might be exploited in order to separate
and/or expose it; or to selectively recover a
specific metal or metals?
KIEM
G.S. Ansell Department of Metallurgical & Materials Engineering
Building an Economic Opportunity from a
Resource
Economic
Opportunity
Identified Resource
•Metallic Mineral
•Industrial Mineral
•Energy Mineral
Resource •Recycle Material
Properties/
Process
Characteristics
KIEM
G.S. Ansell Department of Metallurgical & Materials Engineering
The ultimate goal is
Process Supports
production of metals and
the Economic
materials in their
Opportunity economically purest form,
from the resource.
Economic
Opportunity
The goal of Process is
Resource
a product with the
highest possible
recovery at acceptable
grade.
Properties/
Process
Characteristics
KIEM
G.S. Ansell Department of Metallurgical & Materials Engineering
Properties/Characteristics
support the Process
Start with determining the
Economic
properties/characteristics of
Opportunity
the resource matrix and its
components.
•Size
•Shape
•Chemistry
•Density
Resource
•Conductivity
•Magnetic
Susceptibility
Properties/
Process
Characteristics
KIEM
G.S. Ansell Department of Metallurgical & Materials Engineering