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

Dewatering: Thickening, Filtering, CCD, Water Treatment & Tailings Disposal 2017-04-04T06:57:46+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.

Acid Neutralization Potential (4 replies)

2 years ago
OberstGruppen 2 years ago

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?

Maya Rothman
2 years ago
Maya Rothman 2 years ago

It is not clear to me if the source of your % CaO is reported from actual ANP titration data, or if it is a result from some other method (e.g. total Ca reported as % CaO from XRF). ANP and AGP data are typically reported as tons CaCO3/kt material, or equivalently, kg CaCO3/t material. If your data represent ANP reported as % CaO, then this can be converted to units of CaCO3. The value will be larger when reported as CaCO3 because CaO has a CaCO3 effectiveness of 179%. Both CaCO3 and CaO consume 2 mol H+ per mol solid. For example, if you have 2% CaO, this is equivalent to 20 kg CaO/t. Multiplying 20 kg/t by the atomic ratio of CaCO3/CaO (1.79) gives 35.8 kg CaCO3/t. If on the other hand, your CaO data represent a different type of analysis (such as total elemental content), then this calculation will likely over predict the actual ANP.

2 years ago
OberstGruppen 2 years ago

Let me explain better: If I have a tailings sample mixed with cement, and if I know the % S-2 and % CaO, Can I calculate the AGP and ANP for this sample analytically (No tritation lab)?

The % S-2 and % CaO is taken from ICP and XRD reports.

Carl Jenkins
2 years ago
Carl Jenkins 2 years ago

It depends on the mineralogy and the response of the minerals to the test method used. Generally CaO from whole rock analysis would not be a good estimate of ANP, in this case, unless it is in the form of un-reacted lime and calcite. If there is gypsum or other non-acid neutralizing calcium mineral is present ANP would be biased high. I recommend ASTM E1915 methods backed by mineralogy to select the most appropriate method. Try measuring acetic acid soluble calcium to check your assumption.

Maya Rothman
2 years ago
Maya Rothman 2 years ago

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 be estimated from the % CaO as I described above. The AGP can be estimated by the traditional method of assuming all sulphide-S is present as pyrite (AGP, kg/t, = % Sulphide-S x 31.25). Then you can estimate the overall net neutralization potential (NNP = ANP - AGP).

Please join and login to participate and leave a comment.

BUY Laboratory & Small Plant Process Equipment

We have all the laboratory and plant equipment you need to test or build/operate your plant.

ENTER our Mining Equipment' Store

We Sell EQUIPMENT for all types of Mineral Treatment PROCESSES and Laboratory Testing needs

Have a Mineral Processing QUESTION?

Come in, ask your question

911Metallurgist Community Forums

Talk to other metallurgists and be helped.


We can IMPROVE ALL PLANTS / Mineral Processing Engineering & LABORATORY Ore Testing

911Metallurgy Engineering

Contact us for process engineering, metallurgical investigations, plant optimization, plant troubleshooting, needs. WE “FIX” METALLURGY.

Checkout our Mining Process & Lab Equipment SelectionCLICK HERE TO ENTER
+ +

Pin It on Pinterest

Share This