Process of carbon adsorption in a carbon slurry process

The figure below is a typical carbon slurry adsorption process. The gold cyanide-containing slurry obtained by screening 24-mesh sieve to sand, sawdust and other debris, so that they enter the CIP process, accelerated wear of carbon, clogging of the screen and forming a frangible section between the carbon in the carbon regeneration process.

 

The adsorption section is formed by connecting several adsorption tanks in series. The slurry flows from the first adsorption tank to the latter several tanks, and the activated carbon moves from the last tank to the first tank in the opposite direction. Each tank contains a certain amount of activated carbon, and the density of carbon in the tank is generally 8 to 25 g / liter of pulp. In order to keep the density of carbon in each adsorption tank constant, a series of air lifters are often used to lift a certain amount of slurry in the tank to the inter-segment screen. The activated carbon and the slurry are separated on the inter-segment screen, the char moves forward in a tank, and the slurry returns to the original tank. In this way, the carbon moves forward in turn. To supplement the char in the tank, fresh charcoal or recycled charcoal is added from the last tank. Due to the adsorption of gold by activated carbon, the concentration of gold in the slurry is the lowest when it is discharged to the last tank, and it is discharged as tailings, while the first tank can obtain saturated carbon with a predetermined amount of gold. The saturated charcoal (the amount of gold can be up to 4 to 11 kg / ton of charcoal) discharged from the first tank is sent to the desorption section to recover gold. Is provided between the segment between the adsorption grooves 28 mesh sieve, 200 mesh fineness allows the pulp and the 6 to 20 mesh size activated carbon is completely separated. In order to fully recover the fine-grained charcoal in the tailings slurry, the tailings discharged from the last tank are recovered by 40- mesh fine screening before being discharged into the tailings inventory, and the sieved fine-grained charcoal is added to the last adsorption tank of the adsorption system. Previously, in order to ensure the particle size of the carbon meets the requirements and remove the corners of the carbon (the formation of fine carbon particles during the adsorption process), it is generally necessary to stir in a stirred tank for 2 to 4 hours, and then sieve the fine carbon sieve before use. . Similarly, the regenerated carbon should be sieved to remove fine carbon, and then only 6 to 20 mesh charcoal is returned to the adsorption tank. In order to make the slurry fully contact with the activated carbon, the adsorption tank is provided with a stirring device.

The number of adsorption tanks, the movement speed of the slurry and activated carbon, the concentration of the slurry and carbon in the tank are the main factors that determine the adsorption effect. Most of them are determined by experiments and can be selected empirically.

The carbon slurry process generally consists of three basic processes:

Adsorption    The gold in the cyanide slurry is adsorbed on the activated carbon.

Desorption electrolysis    The gold is desorbed from the gold-loaded charcoal into the solution, and the gold is electrolyzed from the precious liquid containing rich gold.

Regeneration of carbon    The demagnetized charcoal after desorption is regenerated, and its activity is restored and returned to the adsorption operation.

The latter two processes are described in separate topics.

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