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

Dewatering: Thickening, Filtering, CCD, Water Treatment & Tailings Disposal 2017-03-23T09:42:05+00:00
  • To participate in the 911Metallurgist Forums, be sure to JOINLOGIN
  • Use Add New Topic to ask a New Question/Discussion about Thickening, Filtering or Tailings and Water.
  • OR Select a Topic that Interests you.
  • Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent).
    Using Add Reply allows you to Attach Images or PDF files and provide a more complete input.
  • Use Add Comment = to comment on someone else’s Reply in an already active Topic/Discussion.

0
REPLIES
6
VIEWS
Started by Amare Goitom
hello all, We have, tailing water treatment to reuse and avoid pipe scaling (due to gypsum) in plant, with addition of lime. but I realize that the sulfate ions increase after it goes some reduction. can you help me what caused the reformation of SO...
2
REPLIES
122
VIEWS
Started by Boyd
hi all, i need help with the settling test procedure and calculation of how many millilitres of flocculant needed to be added to 1 litre pulp. we have 3 types of flocculant on site and i need to know the effectiveness of each. i want to make 0.05 a...
Last commented on by Boyd
hi, kindly receive by appreciation for this in-depth knowledge you have passed to me
5
REPLIES
446
VIEWS
Started by spaceexplorer
Industrial Applications of Tailings Does anyone have any idea or know in which industries that discharged tailings could serve as economic raw material? Besides gold which is our primary target, our tailings are fairly rich in Ag, Cu, Fe and Pb; bu...
Last commented on by Stevens
Hi Barstoolminer,Can you throw more light on the "high frequency magnetic process" you mentioned, please? What minimum concentration of targeted metal is required for effectiveness? Can it be applie...
3
REPLIES
151
VIEWS
Started by Boyd
Hello everyone, i need help with the size of cyclone i can install to act as a bypass to the overloaded concentrate thickener and avoid dirt overflow. Basicaly i want to split the feed to thickener in 40% to 60% or what ever percentage of feed to go...
Last commented on by Boyd
Thanks Dane for your valuable comments, actually the design of the thickener is somehow not correct and i want to find the cheaper means to over come the current design of the thickener.
2
REPLIES
220
VIEWS
Started by martie
Hello there,  am interning at a gold mine where there are problems with the clarity of the overflow of the pre-leach thickeners. Initially, only flocc was used at 0.1% strength.  Now we are testing a coagulant as well at different dilutions on the ...
Last replied to by Sammy Rabie
Hi Martie It might also be a good idea to check if your material even needs a coagulant. A coagulant is generally only needed in cases where the material properties is such that floc does not work, n...
1
REPLY
188
VIEWS
Started by Victor K
Hi everyone! I am interested in conducting a study concerning the performance of a natural coagulant in sedimentation process. My focus is to use a Lady's finger fruit (also known as OKRA) and compare its performance with the artificial one, such as ...
Last replied to by Rheomet
Suggest starting with base line reagent (coagulant) screening  tests, in 100 mL graduated cylinders so you can get an initial idea on effectiveness. For best results, you may need to use some floccu...
3
REPLIES
179
VIEWS
Started by Crmnt
Hello everybody, I need some documents about calculating wash recovery, metal recovery, how many thickener we need for CCD system. 
Last replied to by Maya Rothman
After your reading, maybe connect with https://www.linkedin.com/in/joseph-kafumbila-616a8936 as I think he may understand CCD well.
1
REPLY
241
VIEWS
Started by kahonde
hello, what is the best oxidising agent that i can use in vat leaching and is there anything wrong with hydrogen peroxide?  
Last commented on by kahonde
THANK YOU VERY MUCH
21
REPLIES
809
VIEWS
Started by Sugar Watkins
I'm looking for the most efficient way to de-water the tailings leaving my froth flotation Pg-Ag process. Having a very limited space around the plant (the plant itself 150 Tons/Day) I can't be creating a new tailing pond but rather implementing some...
Last replied to by Oberfuhrer
What is your current Vortex and Apex diameters? Have you tried just a little bit smaller Apex from where you are now? I don't think you will get 85% without plugging. You are asking a cyclone to do th...
2
REPLIES
392
VIEWS
Started by Nicollas Manjengwa
Hallo there I want to use lime to increase the Ph from about 7 to anywhere between 9 - 10.5 in effluent for my experiment. How do i calculate the amount of lime to add into the effluent?
Last replied to by David
Review this Nicollas https://www.911metallurgist.com/blog/calculate-ph-without-ph-meter
2
REPLIES
259
VIEWS
Started by Nicollas Manjengwa [closed]
Hello I intend to embark on research and later on assess effectiveness of selected bacteria species that can degrade cyanide effectively. Anyone who has been involved in such work or with any knowledgeable and guiding notes?  
Last replied to by Nicollas Manjengwa
Thank you very much Joel
2
REPLIES
323
VIEWS
Started by rgardila [closed]
Hi Everybody, Someone have information about lab programs to evaluate for a specific case the convenience of use limestone in the neutralisation of an AMD? I would appreciate your comments. Regards, Rafael
Last replied to by Bill Fraser
I attach 6 very useful papers in which you will read: The split treatment of AMD with limestone and lime may offer some advantages in cost and improved sludge characteristics. It might also be used ...
3
REPLIES
358
VIEWS
Started by New Era [closed]
We want to treat CIL tail cyanide with hydrogen peroxide to lower (destroy) free cyanide to less than 50ppm. We have CCD circuit after CIL tanks. I want know how effective it is and what kind of additional equipment required to prepare and use the ch...
Last replied to by Handerson
Hello! The hydrogen peroxide is not good efficiency in pulp, the better to apply is ammonium bisulfite and a good aeration. Testing in the laboratory to find out what best dosage for your type of ore...
2
REPLIES
301
VIEWS
Started by Nino Bonn [closed]
Hi, I would like to ask what reagents and treatment process are used to neutralize 8-10 pH solution or waste. And it would be great if its economical at any parameters. Thanks
Last replied to by Bob Mathias
Nino, what is in your water that you do not like?  Any metals? Cyanide? Or are you only looking to meet pH specifications?
2
REPLIES
400
VIEWS
Started by ianvallecera [closed]
How can  we neutralize a pregnant leach solution to discharge to river? The pregnant leach solution pond contains 3500m3 of solution containing 18 g/liter Fe and 5 g/liter Ni at a pH of 1.0Can you suggest a design for simple plan to neutralize the P...
Last commented on by Dane Smith
HI, just as a note... Iron will only precipitate at low pH if it of the correct Oxidation state. if not, you will need to add an Oxidation step in or push the pH >11. Look up processes called "hig...
3
REPLIES
390
VIEWS
Started by Rajesh Sharma [closed]
How to find the right quantity of mixing the flocculant in water by thickener feed?  
Last replied to by Bob Mathias
You best conduct simple laboratory settling tests.  Did you read https://www.911metallurgist.com/dewatering-thickening/flocculant-dosage/ https://www.911metallurgist.com/blog/flocculation-test-pro...
2
REPLIES
391
VIEWS
Started by Sridharan [closed]
Dear Sirs, I would like to know for my academic interest about the ways to recycle the overburden, tailing etc. of a gold mine into reusable construction and relevant filling material if any. Thanks and regards. Sridhar Pondicherry
Last commented on by Sridharan
Thank you so much.
3
REPLIES
343
VIEWS
Started by tungsten644 [closed]
Is it necessary to have the flocculant solution continuously being agitated while Aging or transferring it in a holding tank would do? 
Last commented on by tungsten644
Hi Dane,We are using a Magnofloc product from BASF and in reference to what you have mentioned regarding the length of flow of no more than 150m, ours here is way longer using a positive displacemen...
2
REPLIES
349
VIEWS
Started by Charlie [closed]
Hello everyone, generally, by how much is: The settling rate of a flotation concentrate increased when the correct flocculant is applied?  The filtration rate of that same flotation concentrate increased when the correct type and amount of flo...
Last replied to by johnclark
With the right flocculant, the settling rate should increase significantly. The added flocculant will require the "optimum" (or higher) conditioning time prior to the concentrate being added to the th...
3
REPLIES
287
VIEWS
Started by snowlakemet [closed]
Hello, Looking at filter press options. Is it possible to size a filter with the following information:Mill Feed 4000 dmt/day Cu Conc: 150 dmt/day - feed density 40% Zn Conc: 700 dmt/day - feed density 50% Cu Conc: particle size 70% passing 3...
Last replied to by Jorge Ganoza
It is important to perform thickening and filtration tests to get reliable information on the settling rate and filtration rate. If you don't want to invest some money in a dewatering testing program,...
13
REPLIES
640
VIEWS
Started by Carl Jenkins [closed]
Can it be possible for caustic soda (NaOH) to form bridging flocculation in a slurry?
Last replied to by johnclark
There is an article ( http://www.yokogawa.com/ca/technical-library/resources/application-notes/ph-in-iron-ore-slurry-naoh-solution/ ) which measured pH vs ZP for "iron ore slurry" and is showing hig...
1
REPLY
421
VIEWS
Started by jovanifirebird [closed]
Do you think it is possible to get an overflow of 1% solid by weight with the right water balance requirement in high rate thickeners or in a gold processing plant? I believe not. Why I am asking you this is, because the plant I got engaged got ...
Last commented on by johnclark
Agree with Jorge's comment - (the % solids is way too high) 1% solids is 10,000 ppm. Settling tests where there is effective settling usually achieve supernatant much lower that 1% (e.g. 100 ppm) unle...
2
REPLIES
297
VIEWS
Started by Javier Ramirez [closed]
A gold cyanide leaching plant uses four CCD thickeners. Each is being fed with flocculant and a clear overflow obtained. Now, planning is to produce paste tailings out from the last thickener in the series. At least 68% solids by weight is needed. Pr...
Last replied to by Javier Ramirez
Dear friends, Thanks for your comments and advice. I will do as recommended. Regards, Javier
4
REPLIES
708
VIEWS
Started by pefh [closed]
Hİ, I am chemical engineer student and in our design project, I have to design  horizontal vacuum belt filter for zeolite production and I can't decide how much filtration area? How can I calculate?  our slurry masses  11000kg per hour. please I...
Last replied to by Bill Fraser
Hi, see https://www.911metallurgist.com/blog/how-to-size-a-thickener and https://www.911metallurgist.com/dewatering-thickening/how-to-size-a-high-rate-thickener/ and this PDF.
1
REPLY
518
VIEWS
Started by aopatma [closed]
I'm a student trying to build a model of a hydraulic classifier. Can anyone tell me if there are any publications out there that might help me with working out the dimensions of the cells? Also, any information on the construction of the classifier ...
Last commented on by David
Also see https://www.911metallurgist.com/blog/hindered-settling-equipment-classifier
1
REPLY
317
VIEWS
Started by E [closed]
  We have tested CO2 shortly couple years ago in our tailings thickening pilot where we added the gas in to feed tank (open tank reactor). We only had two open 1/2" steel pipes in bottom of the tank without any ejectors or diffusers. pH dropped e...
Last replied to by David
Hello E, and welcome. I have never done this myself.  I would, however, be careful in adding gas into the thickener feed-well.  If you material contained reagents, it could froth-up your and preven...
13
REPLIES
620
VIEWS
Started by Maya Rothman [closed]
Cyanide Detoxification of tailings from gold and silver ore with sodium metabisulfite, I would like if you can tell me your experiences with this process, I want to reduce from 900 ppm to 25 ppm.
Last replied to by Helena Russell
Very straightforward stoichiometry: SO2: CN ratio is critical to efficiency. As well as pH, Cu+, residence time. Appropriate lab equipment simulating plant conditions is preferred for test work.
3
REPLIES
334
VIEWS
Started by Jean Rasczak [closed]
I can discuss their experiences in using calcium polysulfide instead of sodium metabisulfite. What would be the advantages of using calcium polysulfide?Tests Plan and laboratory! I wish to change the sodium metabisulfite and use the calcium polysulfi...
Last replied to by Gruppen
As discussed polysulphide is suitable for polishing metals after the cyanide has been destroyed. Commercially for high tonnage mine slurries the main options for cyanide destruction are the INCO proce...
8
REPLIES
465
VIEWS
Started by jyefrey [closed]
Hi,Does anyone knows how to remove froth from Magnetite tailings feed tank as it causes poor clarity in the tailings thickeners. The tails feed tank consist of several streams e.g. cyclone overflows, and froth tails. I know it is very uncommon to h...
Last replied to by Nikolay
Joe, is it possible to find out some defoamers (like kerosene for example, or fatty acid soaps) instead of using coagulant? Otherway you may try to understand the zeta-potentials of particles - cont...
9
REPLIES
373
VIEWS
Started by Sachin Prakash [closed]
Does anyone have experience about flocculent impact on Molybdenum flotation?As you know overflow of thickener will be used as process water in grinding and flotation area. Recently we faced with a question about how doesflocculation in tailing thicke...
Last replied to by Amar
Are you facing any such problems? If yes you change flow sheet design by adding cyclone before thickener and avoid flocculent addition.
14
REPLIES
342
VIEWS
Started by Zander Barcalow [closed]
What's the best way to break down flocculants that when in use, blinds up filter clothes? Heat or agitation or both? How do I stop filter cloth blinding by flocculant?
Last replied to by Kumar Choudhry
Try washing them with hot water and the floc should dissolve. This has always worked for me when trying to remove floc build up.
2
REPLIES
239
VIEWS
Started by Victor Bergman [closed]
Someone know where can I find updated information about the marketability of the Sulphuric acid?
Last replied to by Sugar Watkins
Does AMD produced by copper mines contain sulphuric acid? Sulfuric acid is the contributing acid to all AMD regardless of commodity. The concentration (AMD is diluted) and purity is the problem to usi...
7
REPLIES
275
VIEWS
Started by Alan Carter [closed]
Anyone knows what % of a mine company's investment budget is allocated to treating AMD? I understand it is a very broad topic and that the answer will be very much company dependant but even so, there must be a way to have a reasonable average?
Last replied to by Gruppen
All, this is an interesting question, and raises more issues than would appear. We had a visit from Tony Hodge (president ICMM) some time ago. He gave an example of a mine which, at closure, had to in...
6
REPLIES
217
VIEWS
Started by Tony Verdeschi [closed]
Someone know if there is a standard to do lab tests regarding filtration using an activated carbon column? Which are the main parameters to take in account for this kind of tests? Only the most fine suspended solids from the water.
Last replied to by Jean Rasczak
Yes there are coal based media that do not have the added cost of carbon activation.
15
REPLIES
220
VIEWS
Started by Paul Morrow [closed]
Which is the best way to treat (dewatering) sludges from AMD treatment with hydrated lime (and cheap), the sludges are composed mainly by Fe(OH)3, Al(OH)3, Un reacted lime, some of CaSO4, SiO2?Really they are very hydrated and voluminous.
Last replied to by Paul Morrow
Many thanks for your comments; all your comments are very useful for me.

Please join and login to participate and leave a comment.