Upload
richard-gutierrez
View
220
Download
0
Embed Size (px)
Citation preview
7/30/2019 Marcelo Montenegro
http://slidepdf.com/reader/full/marcelo-montenegro 1/18
Optimising Arsenic-Rejection flotation circuit
design and selection based on multiple objective
evaluation
PROJECT: Modelling of penalty element rejectionflotation flowsheets
Marcelo Montenegro, Luis Cisternas
Universidad de Antofagasta / CICITEM, ChileWarren BruckardCSIRO, Process Science and Engineering
Edelmira Gálvez
Universidad Católica del Norte / CICITEM, Chile
7/30/2019 Marcelo Montenegro
http://slidepdf.com/reader/full/marcelo-montenegro 2/18
OUTLINE
Motivation
Methodology
Results
Conclusions
7/30/2019 Marcelo Montenegro
http://slidepdf.com/reader/full/marcelo-montenegro 3/18
BASE CASE
MOTIVATION
O P T I M I Z E Optimize the separation of
Copper and Arsenic in aTennantite,Chalcopyrite,Gangue
system, using pulp potential.
P R O D U C
T Produce two products: 1) High
Arsenic and low Copper, 2) Low
Arsenic and high Copper.
Improve the copper grade and
recovery in the product.
A R S E N I C Avoid penalty by Arsenic
Reduce environmental impact
and increase the income
7/30/2019 Marcelo Montenegro
http://slidepdf.com/reader/full/marcelo-montenegro 4/18
METHODOLOGY
S U P E R S T R U C T
U R E
Represent a set of feasiblecircuits to be evaluated for the
Chalcopyrite, Tennandite,Pyrite and Quartz system.
S I M U L A T I O N
Generation of results for each
specific circuit
E V A L U A T I O N
Use of metrics and spidergraphics to analyze, select and
compare flotation circuits.
7/30/2019 Marcelo Montenegro
http://slidepdf.com/reader/full/marcelo-montenegro 5/18
SUPERSTRUCTUREIMPROVEMENTS
A L T E R N A T I V
E S
A superstructure isused to identify
alternatives
O B J E C T I V E Incorporate multiple
objectives
M E T R I C
Metric is used toevaluate efficiency,
quality, capacity,
environmental
impact and economic
7/30/2019 Marcelo Montenegro
http://slidepdf.com/reader/full/marcelo-montenegro 6/18
REPRESENTATION OF CIRCUITS
Stage Chalcopyrite Tennantite Gangue Water
Rougher high As-Cu 0.9600 0.9900 0.4200 0.4000
Cleaner high As-Cu 0.9628 0.9848 0.4082 0.2345
Re-cleaner high As-Cu 0.9628 0.9848 0.4082 0.2345
Product 1 high-As low-Cu 0.3819 0.9479 0.0699 0.0375
Product 2 low-As high-Cu 0.9445 0.8000 0.0799 0.0505
Processing tail low-As high-Cu 0.9445 0.8000 0.0799 0.0505
Thickener 0.0000 0.0000 0.0799 0.0505
Operational
data
7/30/2019 Marcelo Montenegro
http://slidepdf.com/reader/full/marcelo-montenegro 7/18
RESULTS
GLOBAL COPPER RECOVERY
7/30/2019 Marcelo Montenegro
http://slidepdf.com/reader/full/marcelo-montenegro 8/18
COPPER CONCENTRATE GRADE
7/30/2019 Marcelo Montenegro
http://slidepdf.com/reader/full/marcelo-montenegro 9/18
ARSENIC IN THE PRODUCT
7/30/2019 Marcelo Montenegro
http://slidepdf.com/reader/full/marcelo-montenegro 10/18
SEPARATION FACTOR
7/30/2019 Marcelo Montenegro
http://slidepdf.com/reader/full/marcelo-montenegro 11/18
FRESH WATER/ t ORE
7/30/2019 Marcelo Montenegro
http://slidepdf.com/reader/full/marcelo-montenegro 12/18
Kg CO2 / t ORE
7/30/2019 Marcelo Montenegro
http://slidepdf.com/reader/full/marcelo-montenegro 13/18
INCOME/ t ORE
7/30/2019 Marcelo Montenegro
http://slidepdf.com/reader/full/marcelo-montenegro 14/18
MULTIPLE GOALS
7/30/2019 Marcelo Montenegro
http://slidepdf.com/reader/full/marcelo-montenegro 15/18
SUMBRANCHES
7/30/2019 Marcelo Montenegro
http://slidepdf.com/reader/full/marcelo-montenegro 16/18
SELECTED CIRCUITS FOR FURTHER STUDY
7/30/2019 Marcelo Montenegro
http://slidepdf.com/reader/full/marcelo-montenegro 17/18
CONCLUSIONS
The Base circuit has high copper grade in concentrate, a low value of CO2 emission and low fresh water usage
Including tails recirculation and scavenger cells increase the income
There is not a circuit that is the best in all indicators. Then the
analysis and evaluation must include multiple goals.
The methodology includes superstructure, simulation and multiple
objectives, and it can be easily implemented.
Spider graphics and metric help to quickly analyze the alternatives.
7/30/2019 Marcelo Montenegro
http://slidepdf.com/reader/full/marcelo-montenegro 18/18
Optimising Arsenic-Rejection flotation circuit
design and selection based on multiple objective
evaluation
Contact
Marcelo Montenegro ([email protected])
Luis Cisternas ([email protected])