Laboratory Testing & General Mineral Processing Engineering

Laboratory Testing & General Mineral Processing Engineering 2017-03-23T09:50:31+00:00
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Started by pk_plus
When working on a test work in the laboratory on leaching, I know the concentration of cyanide to be added varies from different plant. But I would like to know the cyanide concentration range that can be used and under what basis and conditions are ...
Last replied to by David
Depends on lots of things.Heap should be less than 0.5kg/t. Might be higher depending on what else is in it.Vat - low would be 3kg/t.
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Started by anjanisail
What is the procedure of sampling for the development of Beneficiation Plant of Iron ore.
Last replied to by Paul Morrow
Can you please describe your situation?
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49
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Started by Erling Young
I am evaluating a silica sand for potential as frac sand. It contains 1-3% calcite. The calcite has a crush strength much lower than the silica and is therefore not desired. The sand size range is 0.1 mm to 1.00 mm. The calcite is uniformly distribut...
Last replied to by JP Garnier
Hello, As a chemist, if at all practical, based on the low calcite % I would leach out the calcite by a dilute solution of hydrochloric acid, the advantages are that it can be made in bulk, in heap l...
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Started by Tailings
Hi I have a slurry pipe of 30 inches in diameter that cascades into a sump (vertical). The flow is very turbulent and we use a standard sample cutter to take a sample of the slurry from one side of the pipe (to measure for %solids). Attached is a ph...
Last replied to by David
restricted to meet a criteria: what/why? You need to describe the problem are trying to solve. We may be able to help you without the $1M sampler.
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Started by Joel
Hello,Sodium hydrosulfite (or sodium dithionite) is an excellent reducing agent. It acts as a hematite reductant in bleaching process of talc; the reaction is very fast at room temperature. The problem is that the talc becomes contaminated with sulf...
Last replied to by David
Bem-vindo ao fórum Joel. maybe this will help you. I am really outside my expertise here. Here is some of what I found. The theory of the action of bleaching clays in decolorizing oils is highly i...
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Started by Mulu
I have a problem of data reconciliation between process plant feed head grade and blend head grade provided by the grade control geologist. Has big difference.  
Last replied to by David
Mulu, Did you read ALL what we gave you? How does it compare to what you are doing? https://books.google.ca/books?id=hE7uBwAAQBAJ&lpg=PA263&ots=--Pe9ZtXzu&dq=Gold%20Mill%20Sampling%20and%20Metallurg...
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Started by novice0812
I have joined a new company and they have conducted a research on upgrading the Ni, Fe and Cr grades of a low grade  laterite ore through reduction roasting. Initially the samples were agglomerated with the addition of coal as reductant and the res...
Last replied to by inOr
Don't some mines produce beneficiated products called "ferronickel" and "ferrochrome"?  I believe they result from mining just the sort of ores you mention.  Mixtures of iron and chrome from chromit...
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Started by Clément
Hello, I am working in a company specialised in stainless steel process. Currently, we use nitric acid to passivate steel, but we want to change that, and use hydrogen peroxide. We work on martensitic and austenitic mainly. If someone is workin...
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Started by Dave
In Assaying for Everyone" 1910, p 27. "The crucible commercially known as Battersea "B" or 20 gram size will be found convenient for use when 1 assay Ton of ore is taken; size "F" or 30 gram when 2 Assay Tons are used, together with the necessary am...
Last replied to by Dave
Thank you!   Dave
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Started by dr47
How much the best moisture content in the crushed ore (gold) for agglomeration?
Last replied to by dr47
Thank you, David & Khosana. Maybe yes, it depend on the content of fine or clay material. Need further investigation on our ore.
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Started by nlhayagan
How do we determine the magnetic drum capacity?
Last replied to by Tarun Karakoti
Wet low intensity magnetic separators? Dry low intensity magnetic separation? You need to test first and calculate the capacity per meter of drum length.  https://www.911metallurgist.com/blog/mag...
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Started by Jade13
Does anyone know of some articles or know of a way to develop a sequential partial extraction method to differentiate Cu minerals in a lab environment?  
Last replied to by Unterstarm
This only method I know of achieving what you are asking about may be found https://www.911metallurgist.com/blog/magnetic-separation-sulphide-minerals
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Started by mallap
Could you please provide the information/flow sheet on commercial acid leaching process of silica sand to remove impurities? Information on acid concentrations, temperature, type of acid, batch versus continuous process would be very helpful. What w...
Last replied to by denverphil
Not so simple as impurities differ in silica sand sources. Start with customer specification and know what you need to produce. Size production quantity wanted including time for maintenance and off-l...
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Started by oratuwe
Hello all, I have a question that is more economic than technical, but still requires technical insight and some experience. I would just like to know, on average how much diesel is consumed in the operation of a mine, on average (say per tonne). I ...
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Started by gracia
How are Emeralds and Béryls processed form the mine to the plant? What equipments are used for automatic sorting in industry?
Last replied to by Maya Rothman
I don't know. Review https://www.911metallurgist.com/blog/extraction-process-pegmatite-minerals and https://www.911metallurgist.com/blog/beryllium-extraction-beryllium-processed Anyone else?
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Started by uday mahajani
How to estimate the viscosity of the slurry ? I have 40% slurry, in water. Sp. Gravity of solid material is 2.0
Last replied to by Rheomet
Agreed with the previous comments - might add also that pulps and slurries do not display  "viscosity" whereas resistance to flow. The difference is that viscosity is not affected by the rate of she...
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Started by
Can anyone suggest on what would be the best process in extraction of Copper Oxide Ore? Reserve 150,000,000T of ore Life of Mine = 15 years Head Grade 0.8% Mineralogy = Malachite and Cuprite
Last replied to by kevinextraction
Leaching-Solvent Extraction-Stripping-Electowinning(L-SX-EW) will be a good way for this kind low grade copper oxide. But you should pay attention to the composition of your ore, the impurities after...
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Started by DORA DORA
What process or instrument should used to determine the true assay of tellurides or tellurium?
Last commented on by DORA DORA
Hello Xanthate, It is not what you think. I just want the book or the article to where you have obtain such knowledge for me to be able to clarify to myself how the process was done. But still thank ...
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Started by DORA DORA
What proper methods should be employed in the recovery of tellurides from processing the gold tailings.
Last replied to by metalsmythe
Since no one else has replied, being a Metallurgist too, I will: This is an important question. If you have Gold Tellurides, you must use a specialized priority method to treat your ore or concentrate...
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Started by DORA DORA
How to recover tellurium from gold and silver tellurides?
Last replied to by inOr
GeoffC, thanks for sharing that method, and the toxicity warning. I'm confused about the Tellurium precipitant, however.  In one sentence, you use sodium sulfide, while you use NaSulfite.  Are these...
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Started by Wfhsg
Just wondering what the consensus was surrounding non phenolic hot mounting resins? Is this something that is likely to take off in the coming years as a result of increased safety fears about phenolic fumes being given off in baking?
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348
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Started by Pauloc
I've dissolved Gold from electronic waste into a solution of sodium cyanide my question is how do I now remove the gold from the liquid safely. At the moment I have about 2 liters of solution thank in advance Paul 
Last replied to by inOr
If you don't want to recycle zinc from other sources, you can buy zinc powder (called "dust") on eBay.  I checked and you can buy 1 lb. for $22-24 for "high purity" product.  You don't really need...
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Started by markoramiusiii
Having the following mineralogy: Free gold, 30% coarse greater than 208 microns, 40% less than 208 microns but greater than 54 microns, 30% less than 54 microns. Any idea would be a great help. Thank you. 
Last replied to by AJNeale
Do some gravity recovery tests.  If the results are positive gravity concentrators will recover free gold down to the 10 micron range.  From what you are presenting, gravity recovery only (conside...
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Started by Helena Russell
Hello everyone, what methods do you use to verify your conveyor belt scale’ accuracy of calibration? I'm familiar with belt cuts as it is the only method i have had practical experiences with. Recently, we did a 30 meter belt cut on a 700 meter le...
Last replied to by KavaliJ
Could you send me your data? I'd like to have a look before I can provide some feedback.    
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Started by kashifsaafi
hey guys.  How a metal like platinum can be extracted from its mineral concentrate like Sperrylite (PtAs2)
Last replied to by inOr
The economy of metals extraction from ores depends on scale.  We would need to know how much Sperrylite is available to you.  How much are you planning to process?  On an ongoing basis - like from ...
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Started by ianvallecera
How can we extract Fe from a pyrite magnetite ore having this characteristics? All I can think is magnetic separation but I guess its wrong because I need Fe concentrate. Using that separation, maybe its inefficient. Please help
Last replied to by jpearcy
Ian, you could use magnetic separation as 80% of the Fe is Magnetite. If you wanted to increase recovery, flotation could be added to extract pyrite out. I would then combine the two concentrates and ...
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Started by Leo5
how can one calculate or establish the slurry density comprising of two different solids at different solid concentrations and densities?
Last commented on by geologist79
Thanks Alan for your valuable input. Now the problem we faced while preparing at the site (with basic beakers, stirrer etc) is the solution turned into a thick colloid. We started with a modest quanti...
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Started by Seeker
How to neutralize excess m-nitrobenzene sulfonic acid sodium salt used in gold stripper after the gold has been removed from the substrate? Please help! Sorry if it is in the wrong category. I tried to search but could not get this  category.
Last replied to by Seeker
Thanks for your reply.The PH of the solution is 5. M-nitrobenzenze sulfonic acid being a strong oxidizer does not let the gold precipitate out. Even if the gold does precipitate, it causes the gold re...
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Started by Marshal Meru
I have observed that Silver Nitrate in distilled water dissolves and give a clear solution but Silver Nitrate in raw (tap) water dissolve and give a milky solution. I happen to pour waste silver nitrate solution into the sink and when I open the t...
Last replied to by Jorge Quintanilla
I read in internet some tests that performed a chemical engineer.She did three different dilution.1. Silver nitrate with distilled water and potassium chloride,2. Silver nitrate with tap water3. Silve...
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Started by sherafat71
hi . how To obtain a retention time of solid particles and sediment in the pulp? Except for radioactive materials What materials can be used to obtain solids retention time? thanks
Last replied to by David
Hi, I use Lithium or Potassium as a liquid tracer. I know of no solid ones.
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Started by Daniel Mandreza
Hi guys, Our company has been operating 3 years now. We are a CIL plant hence we are handling cyanide. Our solution sample is being analyzed with Free cyanide by ISE method. However, the instrument has reached its limit and decided to break down. Ou...
Last replied to by max skinner
I have used the colorimetric method for some time. you can purchase a B & L Spec 20 for around $200.00 on Ebay. The Spec 20 works well. 
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Started by kahonde
hie i am a student metallurgist at Mrasta mining pvt ltd in Zimbabwe.recently we have been facing challenges in trying to vat leach sulphide-gold ore.i proposed to change the lixiviant,better yet do a comparison between cyanide and ammonical-thiosulp...
Last commented on by kahonde
kahondemalcom@gmail.com
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Started by Andrews
Hello everyone,  Not long ago, I saw one of you blog posts highlighting almost all the standard metallurgical crushing, milling, flotation of ores test. Unfortunately, I don't remember the title of the exact blog post. I will be grateful if you ca...
Last replied to by David
Hi Andrews, the site is +2500 pages and growing. Use the search box at to top right of https://www.911metallurgist.com/blog/ it is in there somewhere but you have:Bond Ball and Rod Mill Work Ind...
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Started by Standartenfurer
Hi. I'm interested in learning how to process the pyrite sulfide rich gold ores that are characteristic of the general area around Idaho Springs, Colorado. I'm a complete novice (currently I only run a sluicebox) and I understand that these are compl...
Last replied to by Herman
The sulfuric acid leach formula I am using is patented but it is tested as 99 % leach of all PGMs and gold.Problem is that it doesnt include the precipitation formula.The formula I was using before I ...
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Started by spanner
We are producing a mixed metal hydroxide cake principally containing magnesium, ferrous iron, aluminium, zinc, copper and manganese. There are also smaller volumes of chromium, barium, cadmium, nickel, Beryllium, cobalt, strontium. We need help to se...
Last replied to by jpearcy
This is a very complex problem, for which it is unlikely that an economical process could be proposed, because there are no noble metals that could justify the expense in a multistage metallurgical se...

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