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

Dewatering: Thickening, Filtering, CCD, Water Treatment & Tailings Disposal 2017-04-04T06:57:46+00:00
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Started by abhi
Is it possible to achieve the residual moisture of less than 9% in case of iron ore concentrate by adding some reagents prior to feeding to filtration unit ? If yes then ,reagents comprising which type of functional groups  should be focused to add...
Last replied to by ASHUTOSH SHANDILYA
Dear Abhishek , Pls. let me know ...  after filtration , cake moisture is 9% right ? Presently what is the slurry % moisture feeding to filtration plant ? Are you using any flocculent in thickene...
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Started by Subhash-Kumar-Roy
There is an issue with the CN ppm in the tailings pond, two camels got into the pond area with one camel dying from drinking the water (gate to pond was left open) it is now at 100ppm where the environmental limit is only 10ppm, we currently sprink...
Last replied to by Subhash-Kumar-Roy
Hi, we assayed a sample of the Pond solution and then add Hypochlorite and re-assay for Au content. Results from test show that there is no drop in the Au values, several doses were tested after start...
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Started by brettsylvester
We produce a sulphide copper concentrate at moistures ranging from 11-13% on average but require a moisture of no more than 10.6% for shipment (and of course would like to achieve even lower moistures in order to save on shipping costs).  At presen...
Last replied to by BAUD
1- Stockpiles with very small particles (P80 = 75 microns) have a very slow drying speed. I see that you need up to one week to get the results by spreading out the product stockpiles. If possible and...
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Started by Robert
Seitz, R, 2016 solid-liquid separation - commentary and references - thickeners Solid-liquid separation processes including thickeners and filters are a critical component of concentrators, including concentrate and tailings handling and intermediat...
Last replied to by David
Wonderful post Robert. Thank you!
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153
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Started by jerry andoh
i am currently thickening at 212 microns with feed density of 15% solids however, i want to regrind from 212 microns to 45 microns and thicken to about 55% solids. my major worry is the capacity of my thickener which per design is at 24t/hr but  i a...
Last commented on by ASHUTOSH SHANDILYA
Dear Jerry , just trying to analyze this thickening issue from different angle . If your process is capable to settle the fines very fast , in that way you can pump the slurry very fast and obviously...
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Started by Olga
Hello collegues! Nowadays, paste thickening is very common, for instance, in China and other countries, but still not in Russia. Please advice, what are the main conditions of use, what are the key tailings characteristics that determine its use. ...
Last commented on by Olga
David!!! Thank you veru much!
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Started by Cindy ccindie1994
hello Tailings effluent from the tailings dam is brought back into the hydrometallurgical plant system and raw water from a nearby river is also used in the plant. I believe they are heavy metals and other components still present in the effluent si...
Last replied to by AJNeale
Be careful not to dismiss the river water as a potential source of your problems.  Particularly in northern climates, river water chemistry changes with the seasons.  Look at TDS levels and pH.  Al...
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Started by danny9797
Is there any previous studies or work done on the topic of tailings reprocessing by adding the previous tailings directly back into the circuit but skipping the obvious crushing? 
Last replied to by Robert
Do you have any particular orebody or ore type in mind?
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235
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Started by anjanisail
How to calculate the evaporation loss and seepage loss of water from a Tailing Pond. If there is any thumb rule for calculation of above. Particularly I am looking for Iron ore Application. How to derive what will be the Net water which can be recycl...
Last replied to by David
https://www.911metallurgist.com/estimate-seepage-tailings-dams/ on Determining Mill Tailings Dam Seepage  
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216
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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...
Last commented on by Amare Goitom
thanks gents..
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163
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Started by Billy
Hi all, anyone could share how to quantify cyanide loss in ponds due to UV and HCN volatilisation!? Thanks
Last replied to by David
Billy, you certainly did not read the 389 PDF nor any of the links Paul gave you. The 1st PDF mentions 'sunlight' 10 time and UV over 100x. KINETICS OF NATURAL DEGRADATION OF CYANIDE FROM GOLD MILL...
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393
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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
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575
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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...
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355
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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.
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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...
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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...
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344
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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.
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358
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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
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546
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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
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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
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550
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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
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507
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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...
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395
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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?
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537
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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...
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535
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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...
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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.
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529
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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...
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508
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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...
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461
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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,...
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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...
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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...
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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
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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.
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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
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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...

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