Dewatering: Thickening, Filtering, CCD, Water Treatment & Tailings Disposal

Dewatering: Thickening, Filtering, CCD, Water Treatment & Tailings Disposal

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Started by
Can you share any news on the proven technology Paste Thickeners and its applications?Not all tailings can be converted to paste with thickeners, depends on the rheology. Only the filter can but at very high cost. The paste formation is still un...
D
Last commented on by diegoottoni
Which mine was this, Victor?
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Relationship between thickener settling rates and pH controlled using lime CaO. Does anyone have a good technical explanation between thickener settling rates and pH?
J
Last replied to by johnclark
As mentioned by other folks, the thickener overflow typically needs to be low in suspended solids. The settling rates you mention in the thickener are typically calculated using Stoke’s equation (an...
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Am researching on Cyanide destruction/detox using hydrogen peroxide and/or ferrous sulphate and I am conducting an investigation into the use of hydrogen peroxide and ferrous sulphate for cyanide detoxification. What tests can I conduct to compare ...
Last replied to by David
More at https://www.911metallurgist.com/blog/cyanide-destruction-methods and https://www.911metallurgist.com/blog/hydrogen-peroxide-cyanide-destruction-plant
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Started by Bob Mathias
My topic is about calculations for Sizing a high rate thickener: During the last decade, various methods have been utilized in sizing a thickener such as Coe and Clevenger, Talmage and Fitch and Wilhem-Naide. Which method is superior (recommended) in...
Last replied to by David
Also see https://www.911metallurgist.com/blog/how-to-size-a-thickener
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Here is what I think any decent flocculant plant and flocculant mixing systems must have but surely there can always be better 1. A reliable flocculent 'presence detecting' hopper for a 0.2m3 flocculent bin with a screw feeder, I for some uninformed ...
Last replied to by Jean Rasczak
I had had a clarometer working for 4 years and it was running straight to the floc pump. Having said that it needed weekly attention from the met tech even in a pretty benign environment (sulphide flo...
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Do you think there can be rare metals in bauxite red mud we can recover?Today it is a serious environmental problem of red mud. We need to know more about red sludge and how to make that red mud useful in a simple way.
Last replied to by
Chloride process for your red mud may be costly. You can go for producing cement form red mud.You can contact Nagpur-aluminium dept., doing such research.
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Started by Bob Mathias
How to settle Sepiolite clay fines? I need help settling sepiolite clay fines from saline process water. Anyone out there with experience?Am trying to clean Mg4Si6O15(OH) 6H2O in a cemented (Duricrust) layer. It does have a fibrous structure at a s...
Last commented on by David
And http://911Metallurgist.com/C/DIFFERENTIAL%20SETTLING%20TENDENCIES%20OF%20Clay%20Minerals.pdf from www.clay.org
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During Exploration Phase, What is the Number of Samples and Recommended Analyzes for ARD study? Most of you might know how difficult it is to obtain representative samples for the entire life of a project in order to understand the variability of...
Last replied to by Victor Bergman
Excellent comments and paper and I agree that geoostats is useful in determining sample numbers and is of course essential for generating production schedules by ARD types. However, with respect the o...
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Started by Victor Bergman
As we all know, the correct mine waste rock dump management in piles is one of the key actions to control and prevent ARD and NMD release in the environment. The costs of the required and correct controls for the new waste rock dumps (including th...
Last replied to by Helena Russell
Yes the system is as you described and yes there are potential problems - all these factors need to be taken into account, when selecting the system, passive or otherwise. In most abandoned mine setti...
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Started by Jorge
Hello, my name Jorge  VasquezI am interested about flocculant, the best for gold mineral in CCD use
Last replied to by David
Hello Jorge, we have the thickening forum here https://www.911metallurgist.com/dewatering-thickening/please be specific and clear with your question.  Flocculant selection are ore/material depende...
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Can any one tell me if you have seen a level control in thickeners based on physical properties? Sludge or mud line? Level control in thickeners helps to keep the bed level on the desired level to achieve maximum water recovery and also avoid to in...
m
Last commented on by mehrdad.zamani
rake motor torque measurement can also give idea about bed level
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Do you know an effective solution for thickening of high clay content ore? Most deposits have a considerable amount of clay minerals. Clay minerals even in small amount cause difficult dewatering. Do you know a practical solution for thickening of h...
Last replied to by JohnnyD
Colloidal clays can be very difficult to flocculate and thicken due to the very high surface charges on the clay particles. Try pre-dosing with either an inorganic coagulant (calcium, iron, magnesium ...
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Does anyone have experience with the elimination, reduction or removal and/or collection of flotation froth/foam from the top of concentrate thickeners?
Last replied to by Maya Rothman
I agree with the general theme that the best way is to prevent the froth getting to the thickener in the first place. An audit of the thickener feed flow will often show points at which the slurry is ...
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Started by JohnnyD
Can PEO (polyethylene oxide) be used as a flocculant in a thickener? I've heard that it might be used in the mining industry, such as in the dewatering process for mineral waste. How is it used? Does it increase settling rates?
Last replied to by JohnnyD
Thanks to you all for your responses and information. I was on vacation last week so I just saw them today. I may have some follow-up questions as my knowledge is limited regarding many of these appli...
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Lab Scale work - “under estimation of the thickener solids flux, often by a factor of between 10 and 20”. Following much pilot work indicated that many red herrings were still active and there was a lot of unknowns - in particular when running a...
Last replied to by
The norm has been to oversize the thickener drive for pump failures and bogged units. While I thought that this never occurred in the modern plants, I have just recently learn that it occurred twice...
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Started by Maya Rothman
The effect of feed fine fractions on paste thickeners performance. The application of paste thickeners has been on rise in mineral industries. The efficiency of compression in the bed is a determinant factor which affect dewatering efficiency in the ...
Last replied to by
2 issues come to mind - maintenance and number of units. You are right - only worth considering for small tonnages. How much opex costs do you want to have on tailings? Most plants want as little a...
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Can anyone please help me with a thickener design method? I need the procedures, or advice that should I keep in mind when I design one.
Last commented on by David
Great thickener stuff at http://joelbchristian.com/thickener/thickener.html
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Started by Maya Rothman
For an acid drainage study I need a Procedure for ARD AMD Leach Test for Assessing Water Reactivity and Leaching Potential of Mine Wastes. My project requires the assessment of the selective copper extraction from a waste material (AMD Sludge) in ...
Last replied to by Helena Russell
Regardless if you are wanting to use the method to assess the extraction process or conduct the extraction itself, you would be best to use rotary end-over-end extraction at 29+/-2 rpm which is the st...
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Effects of trace silver concentrations in mine waste on ARD productionI know about the antibacterial effects of silver on human-based microbes - this has been around for centuries. I just learned that silver appears to have the same effect on acidith...
Last replied to by
Interesting work at Michigan Tech found that silver sulfide minerals would interact with mercury cyanide, dissolving silver and precipitating mercury. http://digitalcommons.mtu.edu/cgi/viewcontent.cg...
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Started by Victor Bergman
Hello, I need input about ARD & AMD and regards to Acid Drainage treatment with limestone. Am looking for information about acid mine drainage neutralization using limestone? What oratory tests do you recommend? Any details about column design?...
Last replied to by Victor Bergman
Thank you guys!
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Is the use of Cyanide in gold production a real issue, with respect to its toxicity and environmental impact to local Authorities and gold producers? Is there enough concern out there to warrant a total shift towards a much more friendlier reagen...
Last replied to by
As a broad rule of thumb in initial costs estimates I used the cost of cyanide destruction (OPEX) as approximating the initial cost of the cyanide in the process. Again this will eventually be optimiz...
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What are the arguments and justifications that can be put forward in favor of installing a tails thickener at a gold processing plant? How is a Tailings Thickener a requirement? Am thinking along the lines of reagent consumption reduction, TSF ...
Last replied to by
I think more light must be thrown on the economic viability of this project. Let the expects be precise in their answers. A little cost savings could go a long way to improve a mine's financial regime...
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Hi, I am looking at what's the best way to re-pulp the filter cake post a plate and frame filter press? Typically flter cakes are dropped into a bunker and taken away by front end loader or onto a conveyor for stockpiling or further processing but I...
Last replied to by Maya Rothman
I AGREE the cake can run along a sluice trough , pushed along with process liquor to a filter press cake tank, add more process liquor if required to the tank. You can pump as a slurry from the tank u...
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Silica Sand Dewatering: Cyclostack VS Fish Tail CycloneI am looking for experiences in sand dewatering. Any experiences with the cyclo-stack or similar fish tail cyclones? The should be able to dewater to +80% , increasing solids of the underflow.E...
Last replied to by
Actually, in the original Linatex Australia days the set up included a cyclone separator featuring an overflow box which sandwiched the vortex finder plate between it and the tangential entry feed box...
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Started by Victor Bergman
How much flocculant, with concentration of 0,05 % (m/m), must i add (dosage) in L/min to a thickener with a feed rate of 600 t/h?
Last replied to by Victor Bergman
Thank you all for your input. we managed to diagnose the problem i.e. it appeared that the concentration of our flocculant was insufficient and due to the change in season the temperature also had a n...

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