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Started by
When discussing the reducing plant downtime and considering increasing metallurgical plant uptime, it is essential to have a clearly understandable definition of the terms 'uptime', availability', 'utilisation' and others. In the example outlined abo...
When discussing the reducing plant downtime and considering increasing metallurgical plant uptime, it is essential to have a clearly understandable definition of the terms 'uptime', availability', 'utilisation' and others. In the example outlined abo...
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Hi does anyone out there have "typical" laboratory equipment lists or links to sites that would be useful - Low throughput Au/Ag plant, gravity and flotation. Looking mainly at size frequency, some assay work (using probably AAS), and basic performan...
Hi does anyone out there have "typical" laboratory equipment lists or links to sites that would be useful - Low throughput Au/Ag plant, gravity and flotation. Looking mainly at size frequency, some assay work (using probably AAS), and basic performan...
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Started by Helena Russell
A laboratory grind-ability test made in closed circuit. Should it be regarded as a miniature commercial mill operation? It is normally not a big problem but it depends on the size of the small scale mill and the operation mode. In dry grinding we h...
A laboratory grind-ability test made in closed circuit. Should it be regarded as a miniature commercial mill operation? It is normally not a big problem but it depends on the size of the small scale mill and the operation mode. In dry grinding we h...
Last replied to by
The laboratory grindability test made in little laboratory mill determine the grind ability index a determined size of the product required: 100, 150 or 200 mesh and indicates the number of grams that...
The laboratory grindability test made in little laboratory mill determine the grind ability index a determined size of the product required: 100, 150 or 200 mesh and indicates the number of grams that...
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Started by
Is there any relation between Tyler, ASTM, B.S.S, I.S, AFNOR, and DIN standard test sieves? If any, what is the relation? How the test sieves is are designed? And which is the most popular? Why?
Is there any relation between Tyler, ASTM, B.S.S, I.S, AFNOR, and DIN standard test sieves? If any, what is the relation? How the test sieves is are designed? And which is the most popular? Why?
Last replied to by
There is some similarity between the different standards at certain aperture sizes, but no real easy conversion factor for moving between them. Conversion charts are usually the best option, like the ...
There is some similarity between the different standards at certain aperture sizes, but no real easy conversion factor for moving between them. Conversion charts are usually the best option, like the ...
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My question relates to doubt over Gy´s fundamental error and a sampling protocol. I have been working with a sampling protocol estimated using the DSA heterogeneity test trying to lower my fundamental error and I found a question without an answer...
My question relates to doubt over Gy´s fundamental error and a sampling protocol. I have been working with a sampling protocol estimated using the DSA heterogeneity test trying to lower my fundamental error and I found a question without an answer...
Last replied to by
Consider further crushing or milling of the entire sample, prior to taking your sub samples. A more fundamental problem is that you may be taking a 500 gram sub sample from a 2 kg sample at 95% minus ...
Consider further crushing or milling of the entire sample, prior to taking your sub samples. A more fundamental problem is that you may be taking a 500 gram sub sample from a 2 kg sample at 95% minus ...
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Started by Helena Russell
The Brazil Nut Effect is similar to the Bagnold's effect which has been observed, described and modelled by Bagnold for sand particles in a water stream (observed also with the effect of wind in the desert). This phenomenon is one of the source of se...
The Brazil Nut Effect is similar to the Bagnold's effect which has been observed, described and modelled by Bagnold for sand particles in a water stream (observed also with the effect of wind in the desert). This phenomenon is one of the source of se...
Last replied to by Bob Mathias
I did a tour of a smelter in Japan about ten years ago to audit sampling of concentrates. I observed that as standard practice, a technician put about 200 grams of pulp into a small sealable paper bag...
I did a tour of a smelter in Japan about ten years ago to audit sampling of concentrates. I observed that as standard practice, a technician put about 200 grams of pulp into a small sealable paper bag...
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1017
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Started by Bob Mathias
"Equal particle sizes of a different specific gravity tend to settle in a fluid bed" Your vibration test should yield dense particles at the bottom if the particles were sized equally. Without proper sizing efficient separation cannot be achieved. My...
"Equal particle sizes of a different specific gravity tend to settle in a fluid bed" Your vibration test should yield dense particles at the bottom if the particles were sized equally. Without proper sizing efficient separation cannot be achieved. My...
Last replied to by Maya Rothman
I think that the magnetic forces overcome any electrostatic ones. These magnetic forces are long range and act in liquid as well as dry.
I think that the magnetic forces overcome any electrostatic ones. These magnetic forces are long range and act in liquid as well as dry.
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I am currently working on evaluating the homogenization of our process (currently done with a stacker doing windrows, about 30 layers). For that I have cross-belt sample data (measurement every 20 minutes) before homogenization, and after homogenizat...
I am currently working on evaluating the homogenization of our process (currently done with a stacker doing windrows, about 30 layers). For that I have cross-belt sample data (measurement every 20 minutes) before homogenization, and after homogenizat...
Last replied to by
Sorry for the delay in answering, I work on this mainly on my "off time". Yes SiO2 and MgO are strongly correlated, thanks for that it confirms our approach and 3) Actually I am working on Stdev be...
Sorry for the delay in answering, I work on this mainly on my "off time". Yes SiO2 and MgO are strongly correlated, thanks for that it confirms our approach and 3) Actually I am working on Stdev be...
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Started by JohnnyD
In your Opinion, WHO/WHAT is the Best Mineral Processing (Metallurgy) Test Laboratory? What specific test area is that Lab good and not so go at?
In your Opinion, WHO/WHAT is the Best Mineral Processing (Metallurgy) Test Laboratory? What specific test area is that Lab good and not so go at?
Last commented on by
I would love to go talk to Phil and Wolfie at Dawson Labs to get a referral of a Lab or as a Lab to use. But you know that Great Restaurants go bad once the get big and Franchise out. FLSmidth ate Da...
I would love to go talk to Phil and Wolfie at Dawson Labs to get a referral of a Lab or as a Lab to use. But you know that Great Restaurants go bad once the get big and Franchise out. FLSmidth ate Da...
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Started by Paul Morrow
In this particular example the client can modify the excavators down to 15 cm steam thickness. Question with what parameters can I make cost comparison? I am not sure if the client has the data about the costs per ton compared to unmodified excavat...
In this particular example the client can modify the excavators down to 15 cm steam thickness. Question with what parameters can I make cost comparison? I am not sure if the client has the data about the costs per ton compared to unmodified excavat...
Last replied to by Marshal Meru
As others have said, this is a very site specific question and needs to be evaluated very carefully. The selective mining of interburden material is a lot more time consuming and expensive than the in...
As others have said, this is a very site specific question and needs to be evaluated very carefully. The selective mining of interburden material is a lot more time consuming and expensive than the in...
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Can you assist me with a method that I can use to determine the Specific gravity of a gold ore other than the Pcynometer method. I have the Pycnometer specific gravity test procedure and how to use a pycnometer but am looking for more methods use...
Can you assist me with a method that I can use to determine the Specific gravity of a gold ore other than the Pcynometer method. I have the Pycnometer specific gravity test procedure and how to use a pycnometer but am looking for more methods use...
Last replied to by
Pycnometers work well if there is zero porosity, either as pores in the rock, or as open spaced fractures. Bulk Density is the term used for measurement that includes the open spaces, whether its a cr...
Pycnometers work well if there is zero porosity, either as pores in the rock, or as open spaced fractures. Bulk Density is the term used for measurement that includes the open spaces, whether its a cr...
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Started by Victor Bergman
I have done cyanidation tests on concentrates. In the beginning I did pregrrobing test, to determine the optimal size of a concentrate for gold recovery. After these tests, others were conducted to determine the time of cyanidation. Then, a test to...
I have done cyanidation tests on concentrates. In the beginning I did pregrrobing test, to determine the optimal size of a concentrate for gold recovery. After these tests, others were conducted to determine the time of cyanidation. Then, a test to...
Last replied to by Bob Mathias
It's seems that you possibly do not have enough CN for leaching high grade or residence time is not enough for the nugget Au grains. CIL tests are done when you have prep robbers, carbon is added at s...
It's seems that you possibly do not have enough CN for leaching high grade or residence time is not enough for the nugget Au grains. CIL tests are done when you have prep robbers, carbon is added at s...
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Started by Maya Rothman
Please, how can one prepare say a 0.1 Molar Silver Nitrate Solution to be used in the titration of Cyanide. Please back it with reactions and or calculations if there are any. Thanks.
Please, how can one prepare say a 0.1 Molar Silver Nitrate Solution to be used in the titration of Cyanide. Please back it with reactions and or calculations if there are any. Thanks.
Last replied to by David
The use of 0.1 M AgNO3 solution is not needed. Page 33 from Dorr's Cyanidation & Concentration of Au & Ag Ores Standard silver nitrate solution is 4.33 gm of AgNO3 in 1 liter of distilled water. The...
The use of 0.1 M AgNO3 solution is not needed. Page 33 from Dorr's Cyanidation & Concentration of Au & Ag Ores Standard silver nitrate solution is 4.33 gm of AgNO3 in 1 liter of distilled water. The...
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Started by Victor Bergman
Do you think mineral processor engineers should have great computer programming skills? Mineral processors work with huge amounts of data. Often this is done in Excel spreadsheets. Therefore in order to automate much of what they do, I would hav...
Do you think mineral processor engineers should have great computer programming skills? Mineral processors work with huge amounts of data. Often this is done in Excel spreadsheets. Therefore in order to automate much of what they do, I would hav...
Last replied to by JohnnyD
In my experience, programming skills are becoming more and more important to mineral processing and although not all processors need to have these skills, some should. Although plants vary in the qual...
In my experience, programming skills are becoming more and more important to mineral processing and although not all processors need to have these skills, some should. Although plants vary in the qual...
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Started by Helena Russell
What may be the next frontier(s) to go beyond for mineral processing innovation. I have seen many specific technical questions (asking for hints) and links to what others have to say about innovation and/or what is a key issue in the mineral resource...
What may be the next frontier(s) to go beyond for mineral processing innovation. I have seen many specific technical questions (asking for hints) and links to what others have to say about innovation and/or what is a key issue in the mineral resource...
Last replied to by Maya Rothman
Future mineral processing innovation with rising price of metal in future, is to plan for mss mining with maximum recoveries( may be 100% )of main and secondary minerals by innovative process system i...
Future mineral processing innovation with rising price of metal in future, is to plan for mss mining with maximum recoveries( may be 100% )of main and secondary minerals by innovative process system i...
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Started by
Could we process laterite ore into nickel pig iron without using pyrometallurgical treatment? Can someone gives me an explanation with details on ferronickel VS nickel pig iron? Thanks
Could we process laterite ore into nickel pig iron without using pyrometallurgical treatment? Can someone gives me an explanation with details on ferronickel VS nickel pig iron? Thanks
Last replied to by Victor Bergman
I had made mention of a proposed flowsheet employing RK at the front end followed by a choice between EAF or BF at the backend.However BFs are problematic on the smaller scales.
I had made mention of a proposed flowsheet employing RK at the front end followed by a choice between EAF or BF at the backend.However BFs are problematic on the smaller scales.
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Started by David
I'm always fascinated how questions get asked on technical forums with no data or explanation whatsoever. There are thousands of years of experience at our fingertips here and yet somehow the most vague question is asked, little to no data is supplie...
I'm always fascinated how questions get asked on technical forums with no data or explanation whatsoever. There are thousands of years of experience at our fingertips here and yet somehow the most vague question is asked, little to no data is supplie...
Last replied to by
Many aspects have come out and I feel so happy that we want these Forums; As pointed out, many questions of trivial nature come because the new entrants to industry find something which was never taug...
Many aspects have come out and I feel so happy that we want these Forums; As pointed out, many questions of trivial nature come because the new entrants to industry find something which was never taug...
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Started by Victor Bergman
The selection and purchase of a quality Sieve Shaker may seem trivial but it not. One of the ways to check your sievers is to use calibrated microspheres. These give the results of the check in terms of mean aperture. That gives you two things. F...
The selection and purchase of a quality Sieve Shaker may seem trivial but it not. One of the ways to check your sievers is to use calibrated microspheres. These give the results of the check in terms of mean aperture. That gives you two things. F...
Last replied to by JohnnyD
Its true and good to have a representative samples. But what determines the accuracy. I mean what technique shall I choose for different particles for example, test sieves, cyclosizer and Laser Partic...
Its true and good to have a representative samples. But what determines the accuracy. I mean what technique shall I choose for different particles for example, test sieves, cyclosizer and Laser Partic...
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Started by
Please suggest the best route for processing and extracting iron content Fe 54% TiO2 12%, V 0.7%.Can iron be separated before feeding to the electric arc furnace (EAF)? Can anybody tell if the base is Hematite, then can we go for reduction in Kil...
Please suggest the best route for processing and extracting iron content Fe 54% TiO2 12%, V 0.7%.Can iron be separated before feeding to the electric arc furnace (EAF)? Can anybody tell if the base is Hematite, then can we go for reduction in Kil...
Last replied to by
VTM is, generally speaking, composed of hematite, magnetite, ilmenite, and ulvospinel. Depending on the source, the proportion can be significantly different. XRD can identify the mineralogy. XRF anal...
VTM is, generally speaking, composed of hematite, magnetite, ilmenite, and ulvospinel. Depending on the source, the proportion can be significantly different. XRD can identify the mineralogy. XRF anal...
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Started by JohnnyD
Why are seminars advocating increasing capital expenditure to improve efficiency when our spend budgets are cut?Over recent months there has been a surge in "optimization" conferences and seminars -so much Capital Efficiency Hype. To my horror there...
Why are seminars advocating increasing capital expenditure to improve efficiency when our spend budgets are cut?Over recent months there has been a surge in "optimization" conferences and seminars -so much Capital Efficiency Hype. To my horror there...
Last replied to by
I agree with most of the comments so far; we mineral processing people are so fortunate that we have machine variables and process variables in our hands to play with; a minimum of two variables for ...
I agree with most of the comments so far; we mineral processing people are so fortunate that we have machine variables and process variables in our hands to play with; a minimum of two variables for ...
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Started by
hello everyone!! Can anyone please help me with some Concentrate Marketing and Rejection Limit issues. I need to know more about threshold value of Copper ore or any other, less than which can be reject? and whether this value may vary from deposit...
hello everyone!! Can anyone please help me with some Concentrate Marketing and Rejection Limit issues. I need to know more about threshold value of Copper ore or any other, less than which can be reject? and whether this value may vary from deposit...
Last replied to by
I agree! Mineral exploitation is more complex, not in understanding what to do and how to do, but the parameters required are quite a few and there are no thumb rules. The economics may keep on chang...
I agree! Mineral exploitation is more complex, not in understanding what to do and how to do, but the parameters required are quite a few and there are no thumb rules. The economics may keep on chang...
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Started by
We started a new processing plant, the feed grade is much lower than the project expected (6 years ago) and accept the plant based on the original recoveries. We have another Plant Designed using Unrepresentative Sample!How we can improve the rec...
We started a new processing plant, the feed grade is much lower than the project expected (6 years ago) and accept the plant based on the original recoveries. We have another Plant Designed using Unrepresentative Sample!How we can improve the rec...
Last replied to by Maya Rothman
I agree that the retention time is of course depend upon some other factors i.e the nature and behavior of the mineral subjected to processing, feed volume, pulp density, liberation size, the medium o...
I agree that the retention time is of course depend upon some other factors i.e the nature and behavior of the mineral subjected to processing, feed volume, pulp density, liberation size, the medium o...
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Started by
How do you perform a Process Retention Time Estimate Evaluation to study what time needed for a mineral to travel from before the mill until to concentrate and tailings and how to estimated this time. I thought using a nuclear tracer to be measu...
How do you perform a Process Retention Time Estimate Evaluation to study what time needed for a mineral to travel from before the mill until to concentrate and tailings and how to estimated this time. I thought using a nuclear tracer to be measu...
Last replied to by
On a batch or semi-batch basis measuring the time weighted average of feed versus product weights will give an indication of the minimum retention time, but on a continuous basis the time period neede...
On a batch or semi-batch basis measuring the time weighted average of feed versus product weights will give an indication of the minimum retention time, but on a continuous basis the time period neede...
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Started by
How do you determine screen cloth sizes for limestone crushing. An existing lime crushing plant produces 0.5 mm to 1.5 mm finished product using a double deck vibrating screen with mesh No. 8 on the top deck and 12 mesh on the second deck. Aren't th...
How do you determine screen cloth sizes for limestone crushing. An existing lime crushing plant produces 0.5 mm to 1.5 mm finished product using a double deck vibrating screen with mesh No. 8 on the top deck and 12 mesh on the second deck. Aren't th...
Last replied to by
Thank you for your responses. Gave me points to think of.
Thank you for your responses. Gave me points to think of.
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1090
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Started by
What is the proper way/technique of sampling the percentage of +2mm particles in the slime disposal line of a diamond processing plant. Do I take the sample from the bottom of the pipeDo I take the sample diagonally from the dischargeDo I sample the...
What is the proper way/technique of sampling the percentage of +2mm particles in the slime disposal line of a diamond processing plant. Do I take the sample from the bottom of the pipeDo I take the sample diagonally from the dischargeDo I sample the...
Last replied to by
Thank you all.
Thank you all.
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1113
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Started by
Can anybody share their experience with sonic sieves? Something like the Gilson Ultrasiever, but there is other manufacturers - principle of operation appears the same though Thanks
Can anybody share their experience with sonic sieves? Something like the Gilson Ultrasiever, but there is other manufacturers - principle of operation appears the same though Thanks
Last replied to by Bob Mathias
You're right it was too sweeping a statement. In our mineral world where there is often complex mineralogy and many differently charged materials together, is what I should have said. In a mono-minera...
You're right it was too sweeping a statement. In our mineral world where there is often complex mineralogy and many differently charged materials together, is what I should have said. In a mono-minera...
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1191
VIEWS
Started by JohnnyD
Anyone could share the experience in Processing to improve the Iron total grade in Goethite? Any input will be highly appreciated. The Goethite content and the total Iron grade varies across the samples. First issue is to improve the total Iron. ...
Anyone could share the experience in Processing to improve the Iron total grade in Goethite? Any input will be highly appreciated. The Goethite content and the total Iron grade varies across the samples. First issue is to improve the total Iron. ...
Last replied to by Victor Bergman
It depends on the dissemination size of goethite.
It depends on the dissemination size of goethite.
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Started by
Anyone can share of any factor or adjustment of the Laser Particle Size Analyzer (LPSA) to wet sizing? We have a sample that 100% pass 75 micron. The problem is the LPSA still identify 5% particle of larger than 75 micron. Triplicate sample still s...
Anyone can share of any factor or adjustment of the Laser Particle Size Analyzer (LPSA) to wet sizing? We have a sample that 100% pass 75 micron. The problem is the LPSA still identify 5% particle of larger than 75 micron. Triplicate sample still s...
Last replied to by Victor Bergman
I had a similar problem awhile ago, I found this reference had some useful information: https://pure.ltu.se/portal/files/5204942/Tobias_Andersson_Doc2010.pdfhttp://docslide.us/documents/chapter-2-par...
I had a similar problem awhile ago, I found this reference had some useful information: https://pure.ltu.se/portal/files/5204942/Tobias_Andersson_Doc2010.pdfhttp://docslide.us/documents/chapter-2-par...
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1424
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Started by Bob Mathias
Which copper concentrate treatment process is preferred, Hydro-metallurgical or Pyro-metallurgical ?I understand it depends on the copper concentrate grade. Pyrometallurgical extraction is the most preferred method particularly for concentrate grades...
Which copper concentrate treatment process is preferred, Hydro-metallurgical or Pyro-metallurgical ?I understand it depends on the copper concentrate grade. Pyrometallurgical extraction is the most preferred method particularly for concentrate grades...
Last replied to by Victor Bergman
It is possible to leach most of copper sulphides (also chalcopyrite) with chloride leaching technology having high metal recoveries. Also high gold and silver recoveries are possible.How ever without ...
It is possible to leach most of copper sulphides (also chalcopyrite) with chloride leaching technology having high metal recoveries. Also high gold and silver recoveries are possible.How ever without ...
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Started by
Often we hear and see discussions around pilot plants for process engineering around the mining industry and there are many questions / issues left unaddressed, e.g., Why - Most critically why would anyone run a pilot plant in 2015 given what's known...
Often we hear and see discussions around pilot plants for process engineering around the mining industry and there are many questions / issues left unaddressed, e.g., Why - Most critically why would anyone run a pilot plant in 2015 given what's known...
Last replied to by
Hear are details and links to some references around use of pilot plants for various cases:Hydrometallurgy - challenges with complexity, new processes, stability, etc.Molnar, R., Hydromet piloting: wh...
Hear are details and links to some references around use of pilot plants for various cases:Hydrometallurgy - challenges with complexity, new processes, stability, etc.Molnar, R., Hydromet piloting: wh...
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Started by Victor Bergman
Hello, could we discussion the importance of a good Mass balance reconciliation in a plant or unit operation evaluation?
Hello, could we discussion the importance of a good Mass balance reconciliation in a plant or unit operation evaluation?
Last replied to by David
https://www.youtube.com/watch?v=gnFCAMIN4qI
https://www.youtube.com/watch?v=gnFCAMIN4qI
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1082
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Started by
Gold determination by electrodeposition (Electrophoretic deposition) using graphite carbon elecrode or glassy carbon electrode. Do you have any professional paper? We used to analyse Gold by fire assay finished by AAS or gravimetric but as you know ...
Gold determination by electrodeposition (Electrophoretic deposition) using graphite carbon elecrode or glassy carbon electrode. Do you have any professional paper? We used to analyse Gold by fire assay finished by AAS or gravimetric but as you know ...
Last replied to by
You could have procedure written to analyze the low grade ore you describe. However is is necessary to know your major, minor, and tertiary elements that you are the working with. I personally do no...
You could have procedure written to analyze the low grade ore you describe. However is is necessary to know your major, minor, and tertiary elements that you are the working with. I personally do no...
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6176
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Started by
MetSMART is powerful simulation software that can mass balance, model fit and simulate the behaviour of any ore body within a grinding & flotation plant. Simulate your whole plant from crushing through to flotation in ONE FLOWSHEET and highlight pro...
MetSMART is powerful simulation software that can mass balance, model fit and simulate the behaviour of any ore body within a grinding & flotation plant. Simulate your whole plant from crushing through to flotation in ONE FLOWSHEET and highlight pro...
Last replied to by David
Thank Maya, the King of HSC-Chemistry (on Youtube) is Pertti Lamberg for flowsheet design/layout and Sim is at https://www.youtube.com/watch?v=BSqqKgjqqOw
Thank Maya, the King of HSC-Chemistry (on Youtube) is Pertti Lamberg for flowsheet design/layout and Sim is at https://www.youtube.com/watch?v=BSqqKgjqqOw
It was recently pointed out on another forum that plants with high reliability have both higher than average profits and fewer accidents, yet constantly the media and others harp on that those who pla...