Carbon Attrition and Preparation
3
Minerals Services Revision General Doc Type Global Method No: Service Minerals Services Gold Project Scoping Phase Carbon Attrition and Preparation Issued Date Review Date Approved by 1.0 SCOPE To pre-attrition activated carbon in order to remove fines and sharp edges that will interfere with metallurgical testing. 2.0 SAFETY Safety glasses Dust mask Forced air ventilation 3.0 EQUIPMENT & REAGENTS 20 L pails DI water Variable speed mixer and 15 cm turbine impeller 16 Tyler mesh screen (1000 microns) 1600 mL silica cleaning sand (less than 500 micron) Vibrator and sieve ring holder for wet screening Ro-tap for dry screening Drying oven at 110°C Drying pans 4.0 SAMPLE REQUIREMENT 10 L of new (unused) activated carbon (Calgon GRC 22) 5.0 OVERVIEW Pre-attritioning activated carbon is accomplished by subjecting the slurried carbon to vigorous mixing. Weak carbon particles (that would otherwise breakdown in a leach or adsorption test) are thereby eliminated. This reduces the amount of fines in subsequent metallurgical tests, which are likely to affect results. 6.0 PROCEDURE Activated carbon depletes oxygen from surrounding air. Work in a well- ventilated area if opening a large container of carbon or working around a Page 1 of 3 This is an uncontrolled document whenever printed.
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Transcript of Carbon Attrition and Preparation
Minerals Services Revision
General Doc Type
GlobalMethod No:
Service
Minerals Services Gold Project Scoping Phase Carbon Attrition and Preparation
Issued DateReview DateApproved by
1.0 SCOPE
To pre-attrition activated carbon in order to remove fines and sharp edges that will interfere with metallurgical testing.
2.0 SAFETY
Safety glassesDust maskForced air ventilation
3.0 EQUIPMENT & REAGENTS
20 L pailsDI waterVariable speed mixer and 15 cm turbine impeller16 Tyler mesh screen (1000 microns)1600 mL silica cleaning sand (less than 500 micron)Vibrator and sieve ring holder for wet screeningRo-tap for dry screeningDrying oven at 110°CDrying pans
4.0 SAMPLE REQUIREMENT
10 L of new (unused) activated carbon (Calgon GRC 22)
5.0 OVERVIEW
Pre-attritioning activated carbon is accomplished by subjecting the slurried carbon to vigorous mixing. Weak carbon particles (that would otherwise breakdown in a leach or adsorption test) are thereby eliminated. This reduces the amount of fines in subsequent metallurgical tests, which are likely to affect results.
6.0 PROCEDURE
Activated carbon depletes oxygen from surrounding air. Work in a well-ventilated area if opening a large container of carbon or working around a large pile of carbon.
1. Obtain ~10 L sample of carbon to be attritioned. Place in a 20-L pail.
2. Add deionized (DI) water to ¾ fill level.
3. Insert mixer impeller in pail. Turn on mixer. Apply vigorous agitation by increasing the speed of the agitator until a vortex develops without splashing.
Page 1 of 2This is an uncontrolled document whenever printed.
Minerals Services Revision
General Doc Type
GlobalMethod No:
Service
Minerals Services Gold Project Scoping Phase Carbon Attrition and Preparation
Issued DateReview DateApproved by
Ensure that the impellor is 2 inches off the bottom of the pail so that the carbon does not get crushed.
4. Add 1600 mL of fine cleaning sand (silica) with a particle size small enough to pass through screening later (less than 500 microns).
Add cleaning sand at a carbon to cleaning sand ratio of about 20:1 by weight.
5. Agitate vigorously for ~24 hours (usually overnight).
6. Wet screen the carbon on a 16 mesh vibrating screen, in small batches, washing each batch very well. Discard wash water and resultant carbon-sand fines.
7. Retain the screen oversize (carbon) fraction. Place in drying pans and dry at 110°C to constant weight.
Spread out carbon in even layers not greater than ½ inch to ensure even and efficient drying.
8. Dry screen the carbon on a 16 mesh vibrating screen. Retain the plus material and discard the fines.
9. Place in a container (for future testing) with a lid that allows a tight seal when closed. Make sure the container is properly labeled. Carbon absorbs moisture from air – keep container sealed when not in use.
A simple check to see if carbon has been attritioned properly – swirl a latex-gloved hand within the bed of dry carbon. If the carbon has been properly attritioned, there will be almost no carbon fines adhering to the latex glove.
7.0 CALCULATIONS
N/A
8.0 REPORTING
N/A
9.0 REFERENCES
N/A
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