GOLD PLUS
Gold Recovery Granular Activated Carbon
Description Specifications GOLD PLUS 6x12
Calgon Carbon Corporations Gold Plus product is a CTC* 50 (min)
coconut-shell-based granular activated carbon designed and
optimized for gold recovery operations. Gold Plus was Ash by Weight 5 % (max)
developed to be a consistent, cost effective activated carbon
Moisture by Weight (As packaged) 5 % (max)
that delivers the maximum performance required for gold
recovery operations. The use of Gold Plus enables gold Hardness Number 98 (min)
processors to maximize profitability because of the activated
carbons ability to deliver the highest possible yields at a Platelets by Weight 3 % (max)
lower carbon price than traditionally available.
*CTC value may be based upon the ASTM D5742 correlation, CTC = 2.55 x Butane
For gold recovery circuits, it is essential that the activated Activity.
carbon employed provides excellent process performance,
minimal attrition loss and minimal maintenance problems.
Through the years, Calgon Carbon Corporation has
continually improved its manufacturing process to ensure
that high quality products are provided. By screening and
de-dusting during the manufacturing process to eliminate
platelets (flatter granules which are relatively long and wide
while not particularly thick), Gold Plus has been engineered
to exhibit superior abrasion resistance and better flow
characteristics. The enhanced kinetics of Gold Plus allow
for the extraction of trace amounts of gold from every ton of
Carbon In Pulp (CIP) Activated carbon is added directly
ore, even when processing average or low-grade ores.
to the pulp (cyanated ore slurry). Crushed, ground and
Gold Plus is manufactured specifically for gold adsorption. leached pulp is mixed with activated carbon which flows
As a result, the quality of the carbon is extremely consistent countercurrent to the pulp in a series of semi-batch
and tailored to gold recovery applications. Beyond the adsorbers. Because of the products superior hardness,
Gold Plus exhibits low attrition during movement, agitation,
product advantages, Calgon Carbon Corporations expertise
and activation. The high adsorption rate and capacity of
in activated carbon application technology is a valuable Gold Plus permit gold recoveries as high as 98%.
resource for designing and optimizing your entire gold
recovery process. Carbon In Leach (CIL) Activated carbon is added directly
to the vessels in which the cyanidation process is taking
Applications place. Adsorption with Gold Plus can result in recoveries of
97-98% of the gold compared to a 50% recovery rate with
Gold is not always able to be directly recovered. Often, the
conventional cyanidation techniques. Naturally present
ore is crushed to release the gold which is then recovered carbon competes with the activated carbon for the gold.
using cyanidation. The process is characterized by the Therefore, after oxygenation, the cyanidation process is
following chemical reaction: carried out simultaneously as activated carbon is brought
into contact with ore in the mixers. The superior initial
4 Au + 8(NaCN) + O2 + H2O = 4 NaAu(CN)2 + 4 NaOH adsorption rate of the Gold Plus minimizes interference with
gold recovery associated with preg robbers in the ore and
Activated carbon such as Gold Plus will adsorb the gold
thereby results in improved leaching efficiency.
cyanide complex from the gold bearing stream (pregnant
liquor). Gold Plus is selective to gold versus silver, copper, Carbon In Column (CIC) Appropriate for cases where
nickel and similar metals, so it can be used to process ores gold is already in solution (such as with runoff, soluble gold
that contain high quantities of base metals. in a water source, overflow, return water from a tailings dam,
etc.), activated carbon columns in series or parallel flow
Activated carbon is generally applied to extract gold from
mode are used to collect gold using packed beds or a
ores or tailings, including carbonaceous ores which are not fluidized bed (if there is excessive Total Suspended Solids).
recoverable via conventional cyanidation techniques. Packed beds can achieve gold recovery efficiencies greater
Among the process applications where Gold Plus has than 95%; efficiencies of 50-70% per stage are noted with
demonstrated its adsorption effectiveness are: fluidized beds.
Carbon In Pulp (CIP)
Carbon In Leach (CIL) Heap Leaching Low grade surface deposits and waste
Carbon In Column (CIC) rock are candidates for heap leaching. Recoveries of up to
85% can be achieved using Gold Plus.
Heap Leaching
Features Design Considerations
When Gold Plus is utilized, the features shown below Certain points should be considered when designing a gold
provide individual and combined associated benefits for recovery operation with granular activated carbon.
operating plants: Carbons Adsorption Equilibrium
High Adsorption Rate Reduces soluble gold losses, Gold Concentration
adjusts ore tonnage and grade. Gold Plus allows a shorter Hardness and Attrition Resistance
contact time and a faster processing rate for the same Other Metals Ag, Cu, & Ni
activated carbon bed volume. Temperature
pH (Adsorption / Displacement)
Tight Undersize and Screen Distribution Specification
Very low carbon fines and, therefore, minimized gold losses Free Cyanide Concentration
due to undersized carbon particles escaping from the circuit. The Rate of Adsorption
Regenerability of the Carbon
High Hardness Specifications Lower carbon losses Stripping Efficiency
resulting in lower gold losses.
Particle Size
Easily Regenerated Low operating cost, low carbon Seasonal and Ore Variability
makeup, capability to return product near virgin activity.
Coconut Shell Based Material High resistance to fracture
due to structural stability inherited from the shells. Typical Pressure Drop
Low Concentration Adsorption Ability to achieve high
gold loadings from pulps/solutions containing extremely low
concentrations of gold.
De-Dusted This extra manufacturing step results in lower
carbon losses in circuit.
Easy to Strip - Because Gold Plus does not hold the gold
complex too strongly, lower soluble tail losses and the
maximum efficiency through each stage of the recovery
process can be observed.
Uniform Gold Capacity Consistent performance means
that the circuit parameters dont need to be adjusted as
often.
Bulk Bags or Super Sacks Easy to handle and store,
even outdoors.
Packaging
1,100 lb. (500 kg) super sack
Safety Message
Wet activated carbon preferentially removes oxygen from air. In closed
or partially closed containers and vessels, oxygen depletion may reach
hazardous levels. If workers are to enter a vessel containing carbon,
appropriate sampling and work procedures for potentially low oxygen
spaces should be followed, including all applicable federal and state
requirements. Please refer to the MSDS for all up to date product
safety information.
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