Froth Flotation (Sulphide & Oxide)

Froth Flotation (Sulphide & Oxide)2017-04-04T06:57:31-04:00
  • To participate in the 911Metallurgist Forums, be sure to JOINLOGIN
  • Use Add New Topic to ask a New Question/Discussion about Flotation.
  • 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.

Boundry ore or pre activated sphalerite in Cu/Zn flotation (5 replies and 1 comment)

Amare Goitom
2 years ago
Amare Goitom 2 years ago

Can anybody suggest in this, how do we depress pre-activated Sphalerite, due to secondary Cu ions, so as to recover the Cu and Zn in differential flotation?

Sphalerite is floating in Cu circuit and none of the Cu could be recovered. my reagent scheme were SMBS and Na2s and PAX as collector.

2 years ago
Jorge 2 years ago

It's important to know some additional information such as copper and zinc grades, copper minerals, flotation feed size (K80). Right now, based on the information you  provided, the addition of PAX is not appropriate in the copper flotation circuit the collector is very strong. If the addition of sodium sulphide is low or high, results will not be good. The zinc/copper ratio is other important factor to consider in the evaluation. You should perform kinetics flotation tests to determine the optimum flotation time in the copper rougher flotation circuit and in what moment the problem starts (i.e. first seconds). 

Amare Goitom
2 years ago
Amare Goitom 2 years ago

Thanks, Jorge

the feed grade Zn/Cu ratio is ~7:1, feed size being 80% passing 75mic. but I found 30%zinc recovered with 9% cu in first 1,2 min and in 3,6 min almost all Zn recovered.

2 years ago
Jorge 2 years ago

I think you should evaluate the grinding environment that promotes the production of more copper or led ions in the slurry. In order to do this, it is possible to evaluate different sets of depressors to identify the less complicated grinding environment. Test 1, tap water (blank test); Test 2, NaCN, 50 g/t; Test 3, NaCN, 50 g/t and ZnSO4, 1200 g/t; Test 4, SMBS, 600 g/t; Test 5, ZnSO4, 1200 g/t and SMBS, 600 g/t; Test 6, NacN, 50 g/t, SMBS, 600 g/t. In all cases is important to follow the same grinding procedure (e.g. ore, 500 g; water, 1000 mL; grinding time). The solution should be assayed for copper and lead.

Did you evaluate the potential activation of sphalerite at coarser sizes than 75 um K80? Was the activation the same?


Richard S
2 years ago
Richard S 2 years ago
1 like by David

A possible suggestion is try adding some sodium cyanide to your float circuit in the conditioner.  The cyanide will remove copper coatings on sphalrrite. You don't need much, so a low concentration should be used.  You want it to go after the thin copper coatings on the spalerite, not the chalcopyrite or other copper minerals.  Be mindful of the pH of the process water, you want it to be alkaline, above pH 9 to 10.  A small amount of cyanide will complex quickly and there will be little free cyanide left as a concern.  If you are floating with an acid pH, you don't want to use cyanide as it will quickly disassociate to HCN, a poisonous gas.

2 years ago

I agree with Mr. Richard since sodium cyanide is one of the effective reagents to depress zinc sulphide.

Carlos s
1 year ago
Carlos s 1 year ago

Hi, you can try agregating 1,1.5 kg de CaO in the mill for to obtain ph 9.5-10 during this process, in the condittioner adjust the pH at 6.5 with sodium meta bisulfide or amonium bisulfide.

The objetive of CaO is to precipitate all ions of copper that maybe can to generate in  the mill, i made this in a plant in Zacatecas with good results

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


View the Services we Provide

911Metallurgist Mineral Processing & Process Development Laboratory

We have a metallurgical test for every possible mineral type and treatment.


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.

I Need Consulting Engineering Help
I Need Ore Laboratory Testing