Homework Help is Here – Start Your Trial Now!
Engineering
Chemical Engineering
heap leaching

heap leaching

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
See similar textbooks
icon
Related questions
Question
4. 4. (a) For copper there are advantages and disadvantages to using heap leaching versus milling, flotation, and smelting. The decision will depend upon both the type and size of the ore body. Under what circumstances might heap leaching be the preferred option and why? Some mines make use of a combination of heap leaching and more conventional processing routes. How might this be advantageous? (b) (c) A new copper mine is planning on using an on-off leaching system in which the leach pad is reused, with the leached material being placed onto waste dumps. The cycle will consist of 1 months for heap construction, 12 months of leaching and 1 month for disposal. A number of separate leach pads will be used to ensure continuous production. The planned rate for the ore to be processed by leaching is 60 000 tpd. The SG of the ore is 2.4 and the stacked heap will have a voidage of 20%. The heaps will have a height of 15m. How much land area is required in order for the heaps to achieve this production rate? Include an additional 15% to account for the non-vertical slopes at the edges of the heap and the space for ancillary equipment. (d) The average copper grade of the ore is 0.7 %. The total pregnant solution flowrate from all the leach pads is 8 000 m³/hr, with an average concentration of 1.8 kg/m³, with the concentration of copper in the lixiviant that is irrigated onto the heap being 0.2 kg/m³ (ignore any solution or copper losses to the environment in these calculations). What is the average copper recovery for the process? 3 Calculate the pH of the acidic and basic solution below. (a) 0.003 mol/L HNO3 (b) 0.003 mol/L NaOH
Transcribed Image Text:4. 4. (a) For copper there are advantages and disadvantages to using heap leaching versus milling, flotation, and smelting. The decision will depend upon both the type and size of the ore body. Under what circumstances might heap leaching be the preferred option and why? Some mines make use of a combination of heap leaching and more conventional processing routes. How might this be advantageous? (b) (c) A new copper mine is planning on using an on-off leaching system in which the leach pad is reused, with the leached material being placed onto waste dumps. The cycle will consist of 1 months for heap construction, 12 months of leaching and 1 month for disposal. A number of separate leach pads will be used to ensure continuous production. The planned rate for the ore to be processed by leaching is 60 000 tpd. The SG of the ore is 2.4 and the stacked heap will have a voidage of 20%. The heaps will have a height of 15m. How much land area is required in order for the heaps to achieve this production rate? Include an additional 15% to account for the non-vertical slopes at the edges of the heap and the space for ancillary equipment. (d) The average copper grade of the ore is 0.7 %. The total pregnant solution flowrate from all the leach pads is 8 000 m³/hr, with an average concentration of 1.8 kg/m³, with the concentration of copper in the lixiviant that is irrigated onto the heap being 0.2 kg/m³ (ignore any solution or copper losses to the environment in these calculations). What is the average copper recovery for the process? 3 Calculate the pH of the acidic and basic solution below. (a) 0.003 mol/L HNO3 (b) 0.003 mol/L NaOH
Expert Solution
steps

Step by step

Solved in 2 steps with 2 images

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Recommended textbooks for you
Introduction to Chemical Engineering Thermodynami…
Introduction to Chemical Engineering Thermodynami…
Chemical Engineering
ISBN:
9781259696527
Author:
J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:
McGraw-Hill Education
Elementary Principles of Chemical Processes, Bind…
Elementary Principles of Chemical Processes, Bind…
Chemical Engineering
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY
Elements of Chemical Reaction Engineering (5th Ed…
Elements of Chemical Reaction Engineering (5th Ed…
Chemical Engineering
ISBN:
9780133887518
Author:
H. Scott Fogler
Publisher:
Prentice Hall
Process Dynamics and Control, 4e
Process Dynamics and Control, 4e
Chemical Engineering
ISBN:
9781119285915
Author:
Seborg
Publisher:
WILEY
Industrial Plastics: Theory and Applications
Industrial Plastics: Theory and Applications
Chemical Engineering
ISBN:
9781285061238
Author:
Lokensgard, Erik
Publisher:
Delmar Cengage Learning
Unit Operations of Chemical Engineering
Unit Operations of Chemical Engineering
Chemical Engineering
ISBN:
9780072848236
Author:
Warren McCabe, Julian C. Smith, Peter Harriott
Publisher:
McGraw-Hill Companies, The
SEE MORE TEXTBOOKS