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In response to industry requests laboratory tests were devised which assist users in evaluating new carbons for CIP applications and to monitor the performance of carbons in the plant. Copper is an increasingly more common impurity in gold leach solutions and pulps. Two approaches to lower the level of copper in the final bullion have been pursued.
Cyanide extractable gold by bottle roll assay is a logical method for grade control in mines that employ CIL or CIP gold recovery circuits. The technique often provides superior reconciliation with actual gold production in contrast to fire assay.
contacting the carbon with a solution of sodium cyanide and sodium hydroxide at high temperatures . This results in the reversal of the adsorption process with most of the gold desorbing from the carbon back into solution. This produces a small volume of solution with a high gold concentration.
Cyanide is a lixiviant, or reagent that is used to leach, often in tanks, gold from a solid matrix and form a gold cyanide complex. The gold cyanide complex is then extracted from the pulp or slurry by adsorption onto activated carbon. CIL stands for carbon in leach. This is a gold extraction process called cyanidation where carbon is added to the leach tanks so that leaching and adsorption take place in the same tanks.
Correct me if I am wrong, initially Carbon density is lower than pulp because its pores are not fully loaded with gold and Silver yet, then by the time during the CIL process, the Au and Ag Cyanide will fill the Carbon pores hence the Carbon density will be increased and the possibility to settle down will be higher.
if the results from the cyanidation tests are good, it is important to perform adsorption tests on activated carbon. In this way, it is possible to select an appropriate activated carbon. Results from the lab should provide information on the loading capacity, effect of particle size, and contaminants adsorbed by the carbon.
June 10, 2020
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