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

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

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Started by Zander Barcalow
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?
K
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.
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Started by Victor Bergman
Someone know where can I find updated information about the marketability of the Sulphuric acid?
Last replied to by
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...
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Started by
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...
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Started by
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.
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Started by Paul Morrow
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.
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Started by
Does anyone has information about acid mine drainage neutralization using limestone? The lab recommended lab tests? Information’s about column design? I would appreciate your help.
Last replied to by
Limestone is not the magic bullet that a lot of people think it is for passive treatment of acid drainage due to the potential of sulfate armoring. Are you looking at a passive or active system? There...
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Started by Bob Mathias
In an AMD how can I estimate the iron concentration (Fe+2 abd Fe+3) through the measurement of the Redox potential?
Last replied to by Bob Mathias
Many Thanks to everybody, your comments are very useful for me.
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Started by
Citizen science and cooperation between miners and environmental group in Michigan.I think this will be worth watching - hopefully an appropriate level of scientific rigor can be maintained in the monitoring program.http://www.circleofblue.org/watern...
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Last replied to by Standartenfurer
They also made a presentation on Pueblo Viejo, including this aspect, at the recent INAP-GA workshop on Sulphate Treatment in Salt Lake City.
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Started by OberstGruppen
Does someone knows if possible determine the Acid Neutralisation Potential (ANP) reported in ABA tests from % CaO of a sample, like the Acid generation potential (AGP) from sulphides in a sample?
Last replied to by Maya Rothman
I see now the Ca is indeed present as CaO and therefore could assume it is reactive. Based on this information, you could perform several back-of-the-envelope calculations. The ANP (kg CaCO3/t) could ...
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Started by Obergruppenfuhrer
There are hundreds of websites, but most are repetitive, redundant. What specific journals, conferences, websites, and books should I read? I am targeting large copper porphyries in British Columbia.What are the latest techniques and methods?
Last replied to by
Over time sodium is a killer where irrigation is necessary for crop survival. The Sunday’s river valley in South Africa is an example. With over 30 years of irrigation using water containing sodium ...
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Started by Gruppen
Some states are considering legislature that would allow oil and gas companies to use AMD waters for fracking. The two largest benefits that I can see would be a reduced strain on freshwater (a single frack well uses over 4 million gallons of water) ...
Last replied to by Maya Rothman
Re tasking AMD is certainly practical. We are building and operating plants that convert the AMD into potable quality water that is used for agriculture and mine processes. So there is no reason why i...
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Started by Oberfuhrer
I’m working with supervision and remediation of mines and mine waste in Sweden and have come to the conclusion that even in a relatively small country like Sweden the demands on how to characterize and treat mine waste can differ. This made me curi...
Last replied to by Oberfuhrer
I fail to see how the water policy or CEN can regulate how far the analyzes should go. But the links are very nice so thank you. As I said before I agree that what type of analyzes that should be done...
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Started by Standartenfurer
Is anyone aware of a mine that has not been allowed to start operations because of potential AMD issues? Could the Pebble mine in Alaska be an example of such a mine?
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Last replied to by Standartenfurer
Our paper was also peer reviewed at the National Ground Water Conference 2013. I do believe in Wetlands as a means of treating AMD. As you state, patience is a virtue when choosing wetlands as an opti...
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Started by Obersturmbann
Does anyone have any dealings with titanium dioxide mines?To be more specific I am looking at sand’s AMD/sulphuric acid issues.
Last replied to by
We have recently run titanium dioxide mine produced water through our process with great success. We recovered 100% of the sulphuric used and converted the remaining salts into potassium nitrate, ammo...
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Started by Sturmbann
I’ve been doing some acidity measurements recently (following the APHA 2310 method, including the hot peroxide pre-treatment). Then, I tried to compare my measured values with the total calculated acidity values (using the usual equation, taking in...
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Last replied to by Sturmbann
The differences are about 25% - the calculated acidity is approx. 75% of the measured acidity.Regarding the metal concentrations, Fe is between 15 and 50 mg/L; Al is 15-20mg/L; Mn is 12-18mg/L; Zn is ...
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Started by Hauptsturm
How can a water body with high hardness and sulfate be treated in best possible way? How to reduce both hardness and sulfate simultaneously from the water.The water already has a pH of 7.5. So, microbial alkalinity generation would increase the pH. I...
Last replied to by
Just to clarify, there are many systems that separate the water from the sulphate and causes of hardness.However, these treatment methods by themselves are no longer adequate as the mining industry an...
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Started by Oberstorm
There are some easy way to measure the solids content "In situ" of bleed from and AMD process?
Last replied to by Zander Barcalow
Another specific choice you will have to make is the filter mesh. 0.45 µm is inherited from drinking water bacteriology, but has the advantage to be known by everyone and be in plentiful supply.If yo...
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Started by Unterstarm
Is it possible to infer the Eh (pe) of a solution from pH, metals and TDS?
U
Last replied to by Unterstarm
Many thanks for your comments were very useful for me.
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Started by
Which is the Best way to determine the Residence time to reach a neutral pH, and guarantee the formation of all metal hydroxides, such as Fe(OH)3, Al(OH)3, in an active TDS acid water with Ca(OH)2?
Last replied to by
Could you send me more details of the method? The way to eliminate sulfates and Heavy metals?
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Started by
I am doing a correlation between the pH and the theoretical Ca(OH)2 requirement in mg per liter of acid drainage to reach to neutral Zone and precipitate Fe and Al.The expression has the following form: mgCa(OH)2/L acid = k pH ^( -n). Where k is a co...
Last replied to by Bob Mathias
Sounds like a pH stat titration may suit your requirements first on a closed system to determine optimum dosing rates then on a flow through system to demonstrate dynamic system control. By undertakin...
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Started by
In a Acid water treatment System with hydrated lime, if the amount of Sulfates (SO4(2-)), ranges between 60 and 120 mg/L, Fe ranges between 3-5 mg/L, and Aluminum ranges 2-5 mg/L, Fe can be eliminated as Fe(OH)3, and Aluminum as Gibbsite (Al(OH)3)), ...
Last replied to by Maya Rothman
Thanks for your reply. At the time of writing I was not aware it was an existing system. Yes, if you have an existing system it's hard to convince people to invest in capital expenditure. I am not sur...
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Started by
Under what conditions is really a feasible option for reverse osmosis plant, to treat Acid rock drainage?
Last replied to by
When we talk about treatment of mine water, RO is simply a unit operation that concentrates contaminated water - not so much a "water treatment" process in its own right. Pre-treatment of mine water a...
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Started by Zander Barcalow
Does anyone have a PHREEQC file that can exemplify the arsenopyrite oxidation along the time in a column experiment? I have the mineralogical data (Rietveld X-ray), chemical composition (52 elements) and acid-base account data of the solids.Being mor...
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Last replied to by Sturmbann
A well constructed modeling program such as you suggest is possible as a matter of geochemical modeling. The essential, steps would be to establish what tolerances you will accept for "calibration" an...
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Started by Jean Rasczak
Does anybody know what the most active Universities in this field? Who is funding more projects, PhDs, publications?
Last replied to by
In Spain some of the most active universities are:Universidad de Huelva - Prof Jose Miguel NietoUniversidad de Oviedo - Prof Jorge LoredoInstitute of Environmental Assessment and Water Research (IDAEA...
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Started by
I am new into the AMD topic. Does anyone know a good source to catch up with the most up to date AMD remediation technologies? (Proven and not-proven technologies) other than www.gardguide.com
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Last replied to by OberstGruppen
Also try here http://www.infomine.com/publications/search.asp?action=16384&search_text=acid%20drainage&search_dt_all=true&search_type=and&search_field=allanother onehttps://www.linkedin.com/pulse/mine...
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Started by
Does anyone have information (based on field data, preferably, but a well-documented experiment also would be helpful) they can share for a reaction path under partially-saturated conditions for a conversion of Jarosite to Melanterite (or another hyd...
Last replied to by
Alas, no sealed, old samples - I agree that would be a neat experiment (and we may try that). I am hesitant to use H2 (because I don't want to introduce a new electron donor that is not present), but ...
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Started by Marshal Meru
It is now apparent that sulphide waste dumps are associated with an unrecognized atmospheric hazard. Following the confined space accident at Sullivan mine, it became apparent that sulfide waste dumps are associated with an unrecognized atmospheric h...
Last replied to by Marshal Meru
That is true. The risk at Number 1 Shaft Dump was high during May (the time of accident). However, the risk would be higher during the Summer.
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Started by
I need to have an average composition of acid mine drainage including (pH, Heavy metals, sulfates, nitrates etc), It is an information that will help me to have a general idea on the range of various minerals found in acid mine drainage. Also can i g...
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Last replied to by Obersturmbann
Well, i need to know whether you are looking for composition of AMD from coal mine or metal mines, or both, because the metal concentrations significantly varied between two.
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Started by
Potential Major Sources of Error in Predicting Future Sulfate Levels in neutral mine drainage.Any input for the questions below would be appreciated.Not counting flow estimates and predictions, what are some major sources of error associated with mod...
Last replied to by
Thanks for elaborating important issues. One quick thought on your important comments on understanding the conceptual basis of kinetic tests. It is of central importance that design and excite test wo...
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Started by Victor Bergman
I am more particularly specialized in water treatment.I wanted to know if some people have had some problems with broken pump due to a deposit of barium and what solutions exist. Generally, is barium can precipitate by electrolysis or other chemical ...
Last replied to by
My initial guess was probably correct; you have Calcium Sulfate building up on the pump. This stuff loves to build up in high energy places. I'd test the water for sulfates and if they are around 2,00...
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Started by Maya Rothman
3 million gallons of AMD goes into Animas River bring heavy metals as well as mustard colour.
Last replied to by
Video of the event remarkablehttps://www.facebook.com/Mark.Douglas.Canfield/videos/1648111835426695/?pnref=story
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Started by
I am working in a Titration model of acid water with hydrated lime - In the below PHREQC code, why gypsum does not precipitates?SOLUTION 1 pH 3.62unit mg/ltemp 16.0Na 3.6K 3.9Ca 3.7Mg 2.5Cl 1S(6) 93 as SO4Fe(+3) 3.5Zn 0.15Al 3.9Mn(+3) 0.61Cu
Last replied to by
I think the basic answer is that the sulphate concentrations are very low and therefore it takes a large amount of Ca to approach saturation with respect to gypsum. In fact, it looks like gypsum satur...
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Started by
Has anyone seen defensible water quality or tailings geochemical data regarding the Samarco tailings toxicity? There are a lot of news reports citing toxicity but I could not find much in the way of details or supporting evidence.
Last replied to by
Until one knows exactly what the material is, it is impossible to say who is correct. There is clearly a propaganda war going on and everyone is just expected to swallow what they're told (by both sid...
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Started by Kumar Choudhry
I am looking for summary or a literature on innovative and cost effective methods for AMD treatment to be converted to potable water, agricultural water etc.
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Last replied to by Standartenfurer
Our efforts are focused in AMD alkaline typical treatment followed by an acidification and modification with nutrients in order to produce irrigation water. All of our projects have as main goal the b...
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Started by Paul Morrow
How is possible to extrapolate the information from Humidity cells tests (HCT) along the time? It is possible?
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Last replied to by Obergruppenfuhrer
It depends on what you conclusions you are trying to extrapolate. SRK uses HCTs extensively to predict drainage characteristics of waste rock, tailings and reactive surfaces. The trick is the use of s...

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