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Started by DARIO
We are operating a Floatation Circuit which is showing a higher Grade in the Final Tails Compared to the Feed. As can seen from the attached report, Feed    Grade               |       Final Tails 1.20 Cu 0.47 AsCu 1.31 Cu 0.53...
Last replied to by Japhet
Sure, i do agree with Bob Mathias, one more points check the source of spillage(if any) and the sump pumps where is directed to. Is the bunds for rougher and cleaners separated? 
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Started by Fantom
How, by flotation, would you separate sulphide rock with 8% Pb, 9% Zn, 0.3% Cu, and 3.5% Mn? Do you think it would be possible to produce 4 different and clean (penalty free) concentrates? Any possibility to make a manganese, a zinc, a lead and copp...
Last replied to by David
Hello Mr. Silverbus and welcome to 911Metallurgist, This seems to be the topic of the week. I have seen enough about it already! Am so glad I stopped investing in mining and now stick with cheese onl...
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Started by Tamzon
What mineralogical or electrochemical factors could hinder froth formation during chalcopyrite flotation? I do not understand what are the contributing factors in delayed and/or no froth formation.
Last replied to by David
Tamzon, please answer Bob for further help. Frother is added with two main purposes: to reduce and control the bubble size in the pulp by maintaining a target concentration around the bubble formati...
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Started by Romain CADENAT
Dear All  I need to transfer some phosphate froth concentrate (coming from flotation cells) and feed a dewatering hydrocyclone. What should be my average solid concentration for a correct pumping ? I consider 21% solid (weight basis). Do I need to ...
Last replied to by David
With regards to froth tenacity,  it always pays to observe the ability of the froth to breakdown in launders and pump hoppers. While the majority of froths break down easily, it may be necessary to ...
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Started by Alan Carter
how to select flotation cell and size for a capacity upto 125 t/h of copper (chalcopyrite ore). the pilot plant flowsheet is given and also copper grade and recovery is given in attached picture.
Last commented on by
Hi, there is no reason not to go for flotation, this is new copper mine basically chalcopyrite, i would be glad if you can size columns. thanks in advance
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Started by Azadeh
Hi. I aerate the pulp in conditioner to decrease pulp potential for anglesite flotation with Na2S. but how can I decrease the pulp potential more and more?
Last replied to by Bill Fraser
Azadeh, an ORP of -80mV should be where anglesite flotation takes place using NaHS Sodium hydrosulfide at around pH 9 (NaHS will affect that also). This may also help https://www.911metallurgist.c...
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Started by Amare Goitom
currently, batch rougher flotation test is ongoing in our metallurgical lab. the test is aimed to separate sulfide ore Cu and Zn in their circuit, but in the zinc rougher circuit normally, we observe grey, bit shiny and oily surface which does not le...
Last replied to by Bill Fraser
A, post your test results AND test conditions if you are serious about us helping you.
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Started by Saddam
I have been given a project on optimization of copper concentrate grade so as to improve copper and gold recovery. I need help on the main factors which I have to consider in my project. The targeted copper concentrate grade at the plant is 18- 20%C...
Last replied to by Bill Fraser
What frother?  MIBC, Dow, Pine Oil? Glycol? What pHs are you running at?  What is you Au/gold content in tailings?   Your PAX, what strength are you mixing it at 10, 15 or 20%? 500 ml/min: are ...
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Started by Gaco
What reagents(i.e collector and frother) can you recommend to simultaneously float copper sulfides and copper oxides?
Last replied to by max skinner
Marshal is correct, the only comment I want to make is you will not likely be able to use your water over again, no return water except to the oxide circuit. Oxide flotation return water will cause ha...
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Started by glocmines
The ore is Copper Sulfides with liberation size of 130 um, Pyrite of 100um and Magnetite of 160. since magnetite is the coarsest, can we place the magnetic separator before flotation. Our ball mill is set to produce a P80 of 150 um in the cyclone ove...
Last replied to by Khosana
Usually one would go for float first and then followed by magseps. Put it magseps prior to float might compromise your Cu recovery.
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Started by Mahdi
Is there a way for flotation of copper oxide? Is it possible to recovery up to 75 percent achieved? I have sample that about 45% of copper oxide and about 40% recovery was achieved with the SIPX and Sodium Mercaptobenzothiazole Dithiophoishate collec...
Last commented on by Khosana
Hi Mahdi, Which float equipment were you using to conduct this test?
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Started by anyarko1129
I will like to know if there is rule in adding a cleaner scavenger stage in a copper cleaner circuit. I have seen copper flotation circuits with and without cleaner scavenger stages. Simply the circuit with the cleaner scavenger stage, tails from fro...
Last replied to by David
Hi, is this an operating plant? What is your feed grade? What is the 1st cleaner tails assay? Much iron in the feed/tails? Regrind in place? What is your rougher %mass pull? Many would says a good cl...
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Started by lorelie
Is it possible to flot galena first before sphalerite? if the P80 is 160 microns. The liberation size of galena is 90 microns and for sphalerite is 150microns
Last replied to by DavidS
Hi Lorelie, the above answers are both excellent and in answer to your latest question, yes.  I have worked on two Pb/Zn plants and both utilized conditioning tanks before both the Pb and the Zn cir...
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Started by DORA DORA
How to separate arsine from an enargite- pyrite ore to form arsenopyrite by flotation?
Last replied to by inOr
I certainly hope you're not trying to do what you say - make arsine from enargite.  Did you mean arsenic or arsenide?  I don't know the chemistry of the reaction you are proposing, and it must be fa...
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Started by mjhabibian
I try to float the lead mineral the mineralogy is as follow: The sample consist mainly of various types of Fe hydroxides and silica together which occupies over 81 volumetric percent of the sample. The main Pb-bearing phase is actually a Fe hydroxi...
Last replied to by David
mjhabibian, thank you for a complete and detailed question.  You are an example to others. We'll help you as best as we can.  Your chemistry does appear much too much complex. How can you operate t...
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Started by simbarashe chauraya
Hi Guys, I recently ran a concentrate production campaign and I am a bit stuck on how to CALCULATE THE SPECIFIC POWER INPUT IN THE ROUGHER STAGE BASED ON THE KW RATING OF THE MECHANISM AND THE VOLUME OF THE FLOTATION CELL EXPRESSES AS ( KW/M3) – ...
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Started by KUICGO
Has anyone done similar research?  Ivan Brezani's work announced in the MATLAB website attracted my attention. Flotation kinetics - modeling  I have an idea that it could be a part of my master's degree paper, because I really want to do somethi...
Last replied to by Xanthate
This may help you http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.485.5533&rep=rep1&type=pdf
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Started by priyanka muppana
what are the frothers and collectors for calcium sulphate and ferrous sulphate ?  
Last replied to by David
Hello PM, gypsum flotation is very similar to calcium carbonate flotation but depends as well on the morphology of the material, whether it is scale like or crystal like. The general flotation of gyp...
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Started by McDeejs
can i use flotation for a 3wt% nickeliferous ore  and what reagent should i use for the flotation. If flotation is not applicable what hydromet method should i use to get a concentrate of 20% NICKEL... without pyromet  
Last commented on by McDeejs
Thank you David, the sulfur content in the ore is very low so presumably am dealing with laterite. So flotation is out of the question now.
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Started by maino.kaupa
I work in the gold mine mill were we extract gold and silver from both oxide, sulphate and transitional ore at mill rate of 680 t/h, just now we introduce NaSH replacing copper at flotation other reagent in place froth, promoter, PAX. What will be t...
Last replied to by Bob Mathias
I suppose you are trying to sulphidize the copper for flotation. OK, this depends. You need to test to know. It could be 500 to 2000 g/t NaHS. Try and you will see how sulphidizing the oxide minerals...
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Started by Julie
What would cause froth to destabilize? Xanthates are being used as a collector. Would the presence of hydrocarbons in ore (due to oils and grease from machinery) have an effect?  
Last replied to by Paul Morrow
Is this similar to what you are seeing? https://www.youtube.com/watch?v=AMNXeqCwfqE
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Started by Bubbles
To increase the recovery in a flotation process is the stirring speed of the cell important? What is a good recommended speed RPM for the agitators? Does agitator rpm affect flotation recovery? Some say there is no optimum speed that fits all, but ...
Last replied to by Bob Mathias
Most modern mechanical flotation cells run typically somewhere between 4 m/s to 8 m/s tip speed on their rotors. Flotation machine manufacturers generally have a design speed that is somewhere in this...
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Started by knvaid
Do know how I could upgrade have kaolin clay beneficiated by flotation? Can we remove Tio2 and Fe2O3 impurities from Kaolin by using Froth flotation at commercial & industrial level?
Last replied to by Bob Mathias
Knvaid, by sure to review https://www.911metallurgist.com/blog/beneficiation-process-kaolin-clay and the 2 PDF at the bottom.
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Started by gonzalito
How the air suction generated?
Last replied to by gonzalito
Thank you very much. Now I understand, then how do I calculate the airflow? and How do I calculate the diameter of the impeller?
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Started by J4
Hello how can I depress copper ore to maximize gold recovery? I want to construct research please I need your help
Last commented on by J4
My intention is to treat copper from gold at maximum level with low cost. so what chemical and method should i use? please i need your help even document if possible
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Started by Zander Barcalow
Does anyone have experience with adjustment of rotor engagement for Wemco rougher flotation cells? Currently our rotor engagement is varying between 115 and 145 mm and I am not sure which is correct or optimal to provide enough air flow to maximiz...
Last replied to by Craig Lockhart
Hello Zander, I have been using a variety of Wemco cells (ranging from 40 cu.ft. covered to 3500 cu.ft. tank versions) at a number of operations for over 20 years and can tell you the challenges you ...
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Started by Obergruppenfuhrer
What do you recommend as a pH probe to measure pH in cyclone overflow tubs and in flotation cells. I have used Foxboro's but they drift within 2-3 days and once this drift occurs the measurement of high pH (>11) becomes problematic and have to b...
Last replied to by Bill Rico
Hi, We recalibrate our pH probes once a week but we have a cleaning routine that varies depending on probe location. Cleaning occurs because we have some deposition which affects readings. Some probe...
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Started by Patrickymt
I have recently been reading about using froth floatation instead of roasters to rid tin concentrates of Arsenic. Has anyone have experience or theories on the best way to go about it. What kind of collector would be best recommended. Anyone used the...
Last replied to by David
Hi Patrick, There is a guy who is a specialist in Tin. John Glenn – Burnie Labs (ALS metallurgy Tasmania).
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Started by gonzalito
What is the theory for the design of a flotation cell ?. What kind of mathematical calculations should I use? I appreciate your help in advance
Last replied to by gonzalito
Thanks Very Much, I like this subject. I am student  
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Started by Etienne
Do any company use flotation for producing de-icing salt? I have an ore with ~80%NaCl and I'd like to produce a 91%NaCl salt for de-icing. Have you heard about companies that did it? I also would like to produce food salt (97%NaCl) with flotation, b...
Last replied to by ChrisBucknell
So just wondering what is the Pb chloride about at the head of the circuit shown?
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Started by Mahdi
my research is about on chemicals in the copper flotation. Ammonium dihydrogen phosphate collector selectivity is very high copper and pyrite have been depressant but declined to copper recovery. What a way to increase recovery copper. What is the me...
Last replied to by Sugar Watkins
Haven't used it before.....but probably will show dispersing/depressing functions... Probably very similar behaviour to Potassium Dihydrogen Phosphate. Calcite flotation in acidic media is a difficu...
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Started by Omurvama
Hello, Now we are having problems in the selection of the flotation collector for a copper ore, in lab test we can´t see any difference in concentrates with sodium amyl xanthate and sodium isopropyl xanthate. Based on your experience which promoter...
Last replied to by cmutale3
Try to carry out optimization tests using various combination ratios of these collectors. Currently we are using MX 5149 as a primary collector and SEX secondary. David, MX is stronger than SEX but...
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Started by Omurvama
Hi everybody,Me and my team are working in a small plant (30-50 TPD) and we are continuously receiving new materials in order to make evaluations in a lab cell. Recently we have received a new yellow ore with more than 500 g/Ton of silver and 30% of...
Last replied to by Bill Fraser
I think 15 g/t collector is not enough for the heads you got.  Add + collector until your froth get tight. Do it visual: Add collector, turn ON the air -> if frothy = turn OFF air and + add more...
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Started by rokxter
I have been involved in assaying a rock pit with sulfide ore for a couple of years.  We have done gravity concentration tests and the ore loses 75% of the gold and silver value when you gravity concentrate.  We did a down and dirty flotation test w...
Last replied to by max skinner
Along with everything David is telling you, you should consider some screen analysis with assays to tell you   exactly where, size fraction, your gold is. You should do this on your heads and your ta...
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Started by Reinhold Leo
I am struggling with benchmarking copper recoveries of operations with a similar type of ore. Please help
Last replied to by Reinhold Leo
Thank you David. I am reading all the materials you have recommended . If I have any questions, I will let you know.

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