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The Homestake Elution Circuit.Hot caustic cyanide (1 per cent NaOH and 0,2 percent NaCN) is used to elute the gold and silver from the loaded carbon at Homestake, the solution temperature being 88 °C and the elution tanks being conical and made of stainless steel. <a href="">Small jaw crusher for sale</a>.Upflow elution is used, the hot eluting solution being passed through two adsorption tanks in series before going to electrowinning and back to the first adsorption tank. At Homestake about 50 hours is re-required to strip the gold from the loaded carbon from about 9000 g/t to less than 150 g/t. This time of elution is said to vary with different ores.

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Other elution techniques that have been reported and are of interest are the following.Anglo American Technique In this procedure, which was developed by the Anglo JOURNAL OF THE SOUTH AFRICAN INSTITUTE OF MINING AND METALLURGY JUNE1979 317 American Research Laboratories (A.A.R.L.), the loaded carbon is contacted in a cylindrical elution vessel with one bed volume of hot (93 DC) 10 per cent NaOH (or NaOH with NaCN) for about 1 to 2 hours, after which it is eluted with hot water, about 7 bed volumes of water being required. This elution procedure may be preceded by treatment with hydrochloric acid, which removes calcium carbonate and most of the base-metal complexes.Homesake does not use an acid-pretreatment step.Organic Solvents16 The United States Bureau of Mines has reported that elution is more rapid when it is conducted at 80°C with a solution containing 20 per cent methanol, 1 per cent NaOH, and 0,1 per cent NaCN. Although this procedure has yet to be tested on plant scale, the Bureau reports elution times of 6 hours, compared with 50 hours at Homestake, and claims that, when this elution proced-ure is used, thermal reactivation may be necessary only every 20 cycles.

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