Laboratory Testing & General Mineral Processing Engineering

Laboratory Testing & General Mineral Processing Engineering

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Started by jasonmaguire99
Hi all,  Our ore/float concentrate contains pyrite and arsenopyrite. I require a high arsenopyrite concentrate with as little pyrite in it as possible for some leaching testwork but have not had any luck.  Does anybody have any experience with thi...
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Last replied to by Todd H
There has never been much success in commercially separating arsenopyrite from pyrite by flotation.  There are some techniques that have been tried: https://www.tandfonline.com/doi/abs/10.1080/01496...
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Started by Bonzoboy
I hope this subject is correct for this forum.  I'm looking at a process where high-pressure CO2 (associated with H2O) will be blended in a mill/pulverizer with MgSiO4 (milling the silicates down well below -200 mesh).  I expect the carbonate react...
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Started by joshua cheyo
I used this procedure to determine specific gravity of an ore. Is the method accurate?
Last replied to by SmartDog
If the sample was a liquid, that would be correct.  If the sample was a solid (several different particles) then not exactly as you need to account for the voids.  
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Started by SSSlucin
I recently aquired several raw or uncut stones possibly moisanite or saphire have heated a few to glowing  point and dropped in cold water.     So my question is what other stones aside from the afore menchioned are capable of this type of therma...
Last replied to by SmartDog
It will depend on the the individual structure of each mineral sample.  If there are any significant inclusion or fractures planes (which may not be visible) then the stone can fracture quite signifi...
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Started by Nick H
So I've got a project I'm working on that I need help finding a material for. I'm a fountain pen enthusiast, and I'm trying to find a material to make flexible nibs out of that would improve upon the current standard of 14 karat gold. It needs to be ...
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Last commented on by Nick H
Thanks for the suggestion, but I'm not sure how well it would work. How much heat does it typically take for such an alloy to return to it's original shape?
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Started by dgt96
Hello, not sure which topic to ask this question in, but here it goes. Im selling some industrial spent catalysts and my client asked if the catalyst was "roasted" or "unroasted". I had never heard this terminology. Does anybody here has experience w...
Last replied to by SmartDog
You mention spent catalyst, this covers a very wide field and a very wide range of methods to produce the catalyst.  Taking one example of catalyst for hydrocarbon processing the material is usually ...
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233
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Started by alex.gould
Hi, a customer has approached us to make new grate and 'cap' for their vibratory ball mill. The barrel is about 28" in diameter, and 36" long, using about 2000lbs of ball charge. We are hoping to get more longevity from the grate, so the idea is to f...
Last replied to by David
Hi Alex i fixed the image upload bug. Please go ahead and upload your photos. in the meantime, did you see https://www.911metallurgist.com/blog/overflow-vs-grate-discharge-ball-mills & https://ww...
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131
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Started by Mreza555
Hi we are working with a LECO OH836 analyzer. the instrument does not get ready to analyze. we have checked all Orings and fittings, all pressures are at range, leak check passed and there is no warning on diagnostics tab. what should we do to make ...
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252
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Started by bja2399
As pure metal elements get colder, close to absolute zero, do their protons and neutrons lose their ability to avoid combining with other atoms especially if the system is under great pressure, say 300 GPa? Could they combine to form other elem...
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Last replied to by bja2399
May need to go past 1000GPa, but I think it can be done. I'm not sure how to compress pure metal to 1000 GPa or more, however. Any ideas?
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380
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Started by BentFunky
How selective is ammonium chloride when precipitating Pt from aqua regia? For example, will it also precipitate base metals from aqua regia?
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Last replied to by Todd H
You will need to consult a chemistry reference book (CRC) for the various solubilities of metal chlorides to find out.  Most base metals are fairly soluble in the chloride state.
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Started by Opie_Ute
We have a fan at my work, which has ~15% dilute sulfuric acid unintentionally pulled into the gas stream. The fan wheel and housing are constructed of 916L stainless steel. For many years the fan shaft had a 916L stainless steel sleeve on the portion...
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Last replied to by Todd H
I have some experience with material of construction for acid autoclaves and we found that some ferralium alloys tend to suffer grain boundary corrosion in the presence of sulfuric fumes.  The vapor ...
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Started by Millza79
Can anyone point me in the right direction for the proper way of sub-sampling out of a 20 litre bucket of slurry?
Last replied to by David
the best way https://www.911metallurgist.com/equipment/liquid-slurry-sample-splitter/ otherwise mix it with this and take your sample.  
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Started by Johnsonwt
  Hi there, I have been going through much R&D to with a product to find one that is strong enough and rust proof. The latest is carbon steel with a zinc coating.. though salt water seems to penetrate it and cause blackening and some build up...
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Last replied to by Johnsonwt
Hi Smartdog, one last question for you, would Martensitic stainless steel be a good fit as well?
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Started by Seeker
Does rhodium dissolve in aqua regia, if yes, can hot aqua regia speed up the dissolution?
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Last replied to by Wieslaw Wodecki
Rod pylasty rozpuści się w gorącej wodzie królewskiej , ale jeżeli jest w sztabce po stopieniu będzie to trwało wieki. Wtedy do rozpuszczania najlepiej zastosować K2S2O8. Rozpuszczanie w sto...
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Started by lnldtt
Hi everyone, I'm looking for a metallurgical software to simulate a heap leaching operation, in order to forecast plant metal production. My first choice is Metsim but is there any other software that anyone could recommend for this specific applicat...
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Last replied to by SIMetallurgist
Agree with Todd -Metsim -GoldSim -Excel Macro based model - many consultants can build this for you. You will want to understand your heap leach test work data very well before starting to model. ...
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Started by Mreza555
Is there any specific instrument that directly determines sticking index of pellets? or it should be done just by calculations from reduction processes?  
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Last replied to by Jorge
See links below, https://www.911metallurgist.com/pellets-direct-reduction/   https://www.911metallurgist.com/hyl-iii-direct-reduction-process/
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Started by Millza79
Wasn't sure where to put this.   What exactly are "marketing costs" when it comes to sending concentrates to smelters? Are they TCs/RCs or something else?
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Last replied to by afxdes
Marketing costs are generally captured by the Net Smelter Return calculations, which should include finance costs and freight charges. Additionally you can include General & Administrative costs (G&A)...
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414
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Started by kevind
I'm looking for help with processing ore containing gold, silver, and copper. I live in fairly remote location in Baja California on the Sea of Cortez, (an hour by boat from a small town with basics that is 6 hours from a city) and acquiring certain...
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Last replied to by Jorge
I think you should consider a testing program to evaluate the metallurgical performance of the different materials you mentioned. Initially, try to evaluate separately the ore types, based on the resu...
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446
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Started by nhngh
Hi everyone, I'm a newbie here. I don't know if I'm posting in the right place. Could anyone please tell me how to determine which beneficiation technique would be most suitable for beneficiating a Bauxite ore by using the physical parameters of Gib...
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Last commented on by nhngh
So if I want to determine it based on theory, which parameter can I use? I did research and found only the density of Gibbsite.
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590
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Started by Jayakumar
Hello All Can anyone help me, complete process flow of Ammonium Metatungstate (AMT).
Last replied to by David
Apparently not...
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607
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Started by biggerthanpenny
Hi all, I know this is a long shot but does anyone have any information on how to source any of these software packages? The company that produced the software was Mineral Technologies International (http://www.mineraltech.com/MODSIM/index.html), I...
Last replied to by David
i use https://www.hsc-chemistry.com/
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543
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Started by Mreza555
Hi I am working on a ARL8860 instrument and the main use is for copper industry. they use fire assay technique to analyze precious metals. is there an individual "Fire assay Module" for this instrument? or it can be done just by calibrations? Thank...
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Last commented on by Mreza555
I meant they want to analyse lead buttons extracted from fire assay crucibles. and ARL has another OES instrument (fire assay analyzer) designed for this purpose. I wanted to know whether there is a s...
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Started by MSKabir
During rotation of a SAG mill, the three prominent zones are the grinding zone, tumbling or cascading zone and the cataracting zone (crushing zone). Are there any studies about the percentage of wear in the areas mentioned and what type of wear domin...
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Last replied to by Todd H
This is not a straight forward question as it depends on a lot of variables.  Liner designs are meant to keep the wear even so that you are replacing liners that are evenly worn.  You dont want to p...
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551
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Started by richardh
Hi I need assistance in calculating the end velocity of a 278.45 m3/h slurry of 1.6 SG density down a 45 degree rubber lined steel pipe of 480mm inner diameter. The fluid enters the pipe at near zero velocity. The vertical drop is 6.8m and pipe leng...
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Last replied to by Todd H
Also this link: https://www.engineeringtoolbox.com/mannings-formula-gravity-flow-d_800.html
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Started by Angela
Our lab guy has asked about different types of rhodanine: apparently he found cheap stuff and expensive stuff. I thought that there was only one, but I never had to prepare it, myself. An EPA procedure (https://www.epa.gov/sites/production/files/20...
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Last replied to by Jorge
It is correct, to determine free cyanide using silver nitrate titration, you can use rhodanine, It is common to use acetone to prepare the solution. Also, you can use potassium iodide. Both solutions ...
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597
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Started by spoch
Hi, We operate a tin mining operation in central Nigeria that is an alluvial deposit. The ore sand comes with a lot of boulders. Initially we were using a grizzly but this has led to a lot of plant idle time getting because of the time it takes to p...
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Last commented on by spoch
Thank you. Had a look at your website. Can you give me an idea how much a multi gravity separator tat can handle 10TPH costs
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Started by fhb58
I am trying to find out the maximum melt line height which can be safely maintained in a rectangular reverberatory furnace fired on furnace oil. The furnace in question is having 10 tons holding capacity. Is there any relationship of tis factor with ...
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Started by rockape888
Hi, I am evaluating test work completed on a circuit where gravity tails are put through a float circuit. i.e. concentration of the rougher feed. Gravity circuit is likely a Knelson concentrator. Is it possible to scale up this type of circuit to 5 ...
Last replied to by Gene Cheeseman
Hi Rockape, 5Mtpa is approximately 600 tph.  The largest Falcon or Knelson concentrators top out at around 400 tph.  If more capacity is needed multiple units are used in parallel - some plants hav...
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Started by MattN
I'm researching gold tracking and tracing techniques to verify origins of gold. I'd like to find out about what the current state of the art, and future techniques that are under development. I'm most interested in understanding the precision of the ...
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779
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Started by Mreza555
Hello everyone  there is a Leco CS230 instrument with a high sulfur detector. is it possible to have an extra low sulfur detector simultaneously ? or should we change the detector for low sulfur analysis ? Thanks
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Last commented on by Mreza555
Dear Todd First, thanks a lot for minding the issue. our IR cell is a high sulfur and for the concentrations less than 0.01 %wt it has errors. my question was about the possibility of having another s...
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Started by PNeil92
Hello everyone, I'm working in a multi-mineralic evaporite orebody for which a suitable CRM is not available. I have been trying to create  in house standards / MMCRMs over a few grade ranges (at cut off grade , averge of deposit and high grade) bu...
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573
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Started by Millza79
How much mass do you need for a bond rod mill test?   And can the daughter products be used in bond ball mill tests?
Last replied to by Millza79
Thankyou
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543
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Started by sajjadaghazadeh
Hello Everyone; I hope you are doing great. I really need your help and hope mine guys could help me. The fact is that we have faced a very low liberation degree in our iron processing plant. The iron concentration takes place by using primay and s...
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Started by metalshaper
Hello everyone,  I know this question doesn't really fit anywhere on this site but I am in need of some help with zinc sheet metal.   I am a metalshaper and have been asked by a customer to build a gas tank out of zinc sheet.  The sheets are .04...
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Started by Henryezra
Hi all, just a quick one. Say your operation had hypersaline process water with an SG of 1.1. When calibrating the Marcy scale for %solids determination, do you use fresh water with an sg close to 1, or the process water used during milling? Thanks....
Last replied to by SmartDog
Fresh water at its densest (at 4 °C or 39.2 °F) alternatively at room temperature (20 °C or 68 °F). Nonetheless, the temperature and pressure must be specified for both the sample and the referenc...

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