in vat leaching, oxide or oxide sulfide ores are crushed and then leached in large vats with prepared leach solutions. following a rinsing cycle, the leached residue is discarded or further treated by flotation to recover the sulfide copper minerals. each of these methods has its advantages and disadvantages.
vat leaching copper ore vat leaching is a simple and efficient mode of effecting adequate contact between the solute and aqueous solvent. it utilizes the countercurrent principle, with the ore to be leached remaining stationary, as differentiated from most counter-current methods, where all materials are moving.
hi we are planning a vat leaching for hms rejects of copper oxide ore. we are stuck at design and would value inputs. we are planning for a 5000 tons holding capacity for the vat and feed grade is 1% copper. size of feed passing 20 mm. would there be any channeling effect in the vat as we are planing to feed acid at the bottom at one point.
copper ores. although the heap leaching is a low cost-process, it normally has recovery rates of 60-70%, although there are exceptions. it is normally most profitable with low-grade ores. higher-grade ores are usually put through more complex milling processes where higher recoveries justify the extra cost.
the vat leaching process vat leaching can be described as leaching in a bathtub inside a building. treatment of ore is site-specific as determined by metallurgical tests. bench scale metallurgical testing of ores for their amenability to vat leaching is similar to that for heap leaching. first, bottle-roll tests of finely ground material are run
copper ore vat leach cementation stone crusher machine; cs cone crusher hpc cone crusher mobile cone crusher mtw milling machine , some vat leach or pressure leach processes exist to solubilise chalcocite concentrates and produced from copper cementation plants, typically as the endstage of a heapleach operation , small scale wet .
copper dissolved is the actual or expected amount of cu dissolved during the vat leaching process based on the leach performance data. it takes into consideration variations in head grade and would allow for significant reduction of the leach cycle for the current head grades.
the vat is continuously fed, and moves via intermittent fluidization to the discharge point where it is dewatered, detoxified, and ready for stacking. with the ability to accommodate all ores, and any leaching chemistry, innovats continuous vat leaching system is applicable to all leach projects whether gold, silver, copper, rare earth, reclamation, recycling, or anything in between.
copper ores containing chalcopyrite can be concentrated to produce a concentrate with between 20% and 30% copper-in-concentrate usually 27 29% copper ; the remainder of the concentrate is iron and sulfur in the chalcopyrite, and unwanted impurities such as silicate gangue minerals or other sulfide minerals, typically minor amounts of pyrite, sphalerite or galena. chalcocite concentrates typically grade between 37% and 40% copper-in-concentrate, as chalcocite has no iron within the mineral.
a review of copper cyanide recovery technologies for the 16 · failed to perform to the expected design criteria when used to treat the pregnant liquors obtained from the vat-leaching of a copper gold ore at the may day mine
cil leaching to know the amount of cyanide that can be consumed during leaching an ore contain 16% sulfur and less than 5000ppm copper size for required agglomeration in heap leaching 2
electrolysis or electrowinning of 99.15 to 99.85 percent copper from vat leaching of high grade copper ore was proven feasible in the united states in 1914 . more detailed
mitic-copper ore using h 2so 4 as the leaching reagent. the specific objectives were; to establish the copper distribution in the percent passing samples, determine the effects of pul-verizing time, temperature and ph on the leaching efficiency and to assess the economic value viability of the leaching process. kinetics of leaching dolomitic ore
gold vat leaching. the dimensions of vats vary with the work to be done. in calculating the capacity of a leaching vat, the volume of a ton of seven trust ore may be taken at from 22 to 28 cubic feet when dry, and from 20 to 26 cubic feet when wetted down. tailings sometimes occupy 30 cubic feet per ton or even more.
this does not take place when sufficient acid is present to retain iron salts in solution. with proper precautions an ore column of average oxidized copper ore 10 ft. or more in height can be percolated without difficulty; in one recently described ore-leaching plant the percolation vats are being built 16 ft. high.
low quality copper from the leach solution on scrap iron, was practiced on oxide ore that was too low-grade for vat leaching, or low grade sulphide ore that had to be mined in order to expose the underlying high grade sulfide ore. copper recovered from leaching low grade copper ores was considered a bonus and little effort had been made to fully understand the leaching process or to maximize copper recovery.
not all copper ores are acid soluble especially sulfides. it could also be that you dont have the material ground fine enough. heating will also help with the dissolution. also leach times can be much longer upwards of 24 to 48 hours. your acid concentrations should be ok and i suspect it is the other issues. regards
copper minerals present difficulties during the cyanide leaching of gold ores leading to excessively high consumption of cyanide and oxygen coupled with low extraction of gold. copper cyanide species, if present at high levels, adversely affects the downstream processes such as the activated carbon adsorption and the effluent treatment.