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zadra cell (3 replies and 4 comments)
Hi Mohammed,
yes. You get Zadra systems for 1 tonne. The adsorbed carbon needs to be eluted through the elution column with 4% caustic and 2% cyanide solution at around 130 deg C. The gold bearing strip solution is called as pregnant solution which then has to go through the EW cells and gold gets deposited in Cathode (Stainless steel wool). The stripped carbon is regenerated through Electric Kiln and sent back to Adsorption circuit.
What about its recovery rate !
Does it have a good yield
Its better than the electrowinning cell ?
Electrowinning follows Elution.You need EW to recover gold from eluant solution. I dont understand what you mean by recovery. But the complete gold in carbon can be desorbed (recovered) in 16- 24 hrs.
if i established a zadra cell is it enough to collect gold ?
it come after the carbon column ? or don't require active carbon step ?
using vat leaching with sodium cyanide the solution resulting from that step i put it directly to zadra cell or had to use active carbon ?
could you please tell me the operating procedure of the cell ?
The zadra operates in fairly elevated temperature and hence you need less volume to handle. This means you got to place it after carbon circuit which adsorbs gold from cyanide solution and you then again treat this carbon with cyanide and caustic to desorb from carbon (less volume to handle). Enclosed image may be little help.
so its like electrowinning cell but smaller; better to use the electrowinning cell.
could you help me with the lead acid method for determination of gold concentration in gold cyanide solution ?
Procedures. Inorganic Concentration: Lead - Acid
Reagents
C Granulated lead: + 10 mesh - (screened test lead may be used)
C Concentrated HCl
C Lead Foil (7.5 cm x 7.5 cm)
C Ag for inquartation (AgNO3, solid inquart, etc.)
Procedure
1) Measure an appropriate aliquat of sample (typically 300 ml or 150 ml) of cyanide
solution into a 600 ml beaker.
2) Add 1 ml AgN03 solution (6g/l) and mix well.
3) Heat to just below boiling point. Add about 1/2 tsp (9 to 16 g) granulated lead.
4) Add 10 ml concentrated HC1 (CAUTION), cover with watch glass, and boil
strongly for 10 to 15 minutes.
5) Cool solution, and carefully decant so as not to lose any lead.
6) Wash lead twice with deionized water by decantation and dry on a hotplate.
7) When dry, transfer the lead into a piece of prefolded lead foil. Wrap carefully, and
cupel. Part dore , anneal, and weigh gold bead.
Calculation
Au in solution (oz/ton) = Bead weight (mg) * 29.166/sample volume (ml)
C Notes (Battle Mountain Gold)
Method has been compared to several others we have used, in particular the
Copper Sulfate Collection method. With most solutions, assay results showed
no significant bias. With foul solutions, the amount of HC1 added may have to
be increased and reaction times may have to be increased as well. This also
holds for high Au concentrations, though we have not made any detailed
studies regarding this cutoff concentration.
that is the method i mean