TECHNICAL BULLETINT H E C A R B O N C O M P A N Y

A J A C O B I C A R B O N S C O M P A N Y

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Carbon Testing And Circuit AuditService Guide

The importance of Activated Carbon in any GOLD extraction process cannot be over emphasised. Activated Carbon plays a critical role towards the profitability (Operating Costs) of a gold project. Therefore the selection of an efficient virgin carbon such as PICAGOLD® or GOLDSORB® is of utmost importance.

• Resistance to abrasion (hardness and even shape)• Minimize gold losses on escaping A/C fines• Gold adsorption kinetics and capacity• Minimize soluble gold losses • Granulometry (low platelet content)• Avoid inter-tank screens to be plugged The service described below is however not offered exclusively to PICAGOLD® and GoldSorb® users!

Why Carbon Testing?

A small variation in the quality of carbon can have a dramatic effect on the gold recovery and hence the profitability of the plant. Jacobi Carbons, a company with a vast experience of decades in activated carbon, under-stands this need and is committed to providing an ongoing Testing and Audit-ing service to the gold mines to help them maintain good quality of carbon in the circuit and reduce the usage of carbon.

PICAGOLD®/GoldSorb®

(*) ON LOADED & REGENERATED SAMPLES ONLY(**) ELUTED SAMPLE I F ELUT ION IS AFTER ACID WASHING, OR ACID WASHED SAMPLE I F I T IS BEFORE (***) CU, FE, N I, AL, MG CAN ALSO BE ANALYSED

 

95

100

We

ight

(%

)

100 300 500 700

Temperature (∞C)

200606 BOGOSO PACA 060608-5 May 2006 Loaded.001200606 BOGOSO PACA 060608-5 May 2006 Barren.001200606 BOGOSO PACA 060608-5 May 2006 Regenerated.001

Universal V4.2E TA Instruments

TGA of loaded, eluted and regenerated carbon samples

 

6,0

6,5

7,0

7,5

8,0

8,5

9,0

9,5

10,0

10,5

0 10 20 30 40 50 60

Contact Time (in minutes)

Gol

d K

inet

ic :

gold

left

in s

olut

ion

in m

g/l

Loaded Acid Washed Regenerated

Gold loading kinetic curve for loaded washed and regenerated carbons

What Does The Testwork Consist In?

Different Physical and Chemical tests can be done on the activated carbon samples from CIL/CIP/CIC circuits for the purposes of Circuit Performance Assessment and Interpretation. Mainly, three samples - loaded, barren (eluted) and regenerated carbon sample are required from the same elution cycle.

ACTIVATED CARBON TEST LOADED ELUTED REGENERATED

SAMPLE (1L) SAMPLE (1L)** SAMPLE (1L)

Gold Adsorption Kinetics* ü ü

Thermo-gravimetric Analysis (TGA) ü ü

Sieve Analysis by Rota ü ü ü

Platelet Content ü ü ü

Ash Content ü ü ü

Au, Ag, Ca content analysis*** ü ü ü

Ball Pan Hardness ü ü ü

Apparent Bulk Density ü ü ü

Technical Bulletin: Carbon Testing And Circuit Audit

NOTICE Due to the progressive nature of the Jacobi Carbons Group and the continually improving design and performance of our products, we reserve the right to change product specifications without prior notification. The information contained in this datasheet is intended to assist a customer in the evaluation and selection of products supplied by Jacobi Carbons. The customer is responsible for determining whether products and the information contained in this document are appropriate for customer’s use. Jacobi Carbons assumes no obligation or liability for the usage of the information in this datasheet, no guarantees or warranties, expressed or implied, are provided. Jacobi Carbons disclaims responsibility and the user must accept full responsibility for performance of systems based on this data.

© Copyright 2012. Jacobi, Jacobi Carbons, PICA and the Jacobi and PICA logos are registered trademarks and AquaSorb, EcoSorb, ColorSorb, DioxSorb, AddSorb, ReSorb, PICACTIF, PICAPURE, PICATOX, PICACARB, PICAGOLD, PICARESP, PICAHYDRO and PICACLEAN are trademarks of Jacobi Carbons, all of which may or may not be used in certain jurisdictions.

Jacobi Corporate HeadquartersSlöjdaregatan 1

SE-39353 Kalmar | SwedenTel: +46 480 417550 | Fax: +46 480 417559

info@jacobi.net | www.jacobi.net

For more information or to contact Jacobi visit: www.jacobi.net

What Does The Consulting Work Consist Of?

We run those tests and provides a detailed summary with recommendations, based on the analysis of the test results by our carbon experts. We recommend a CTCA to be done twice a year, or to be done in case of any unexplained drop in gold recovery yield of poor circuit behavior.

We Offer

• Plant visit and circuit survey • Sample testing and analysis• Recommendations by our experts• Follow up discussions

You Get

• A benchmark and a trend on the activated carbon status • An alert on any change in the process impacting performance• Suggestions for actions to improve the gold recovery yield

How To Order A CTCA ?

Just 3 samples of 1 litre each are required to be sent to one of our laboratories! The cost of the service shall be provided to you by your Jacobi Carbons representative.

“ Good Carbon Management =

Restored Gold Loading Properties ”

Technical Bulletin: Carbon Testing And Circuit Audit