Metals can be arrang! in a selectivity series according to the strength of the oligodynamic effect:
Cadmium > Silver > Copper > Mercury
It has been establish! that bactericidal action is exert! by metal cations. Metal ions are adsorb! by the surface of the bacterial cell. The reaction of cations with proteins includ! in the cell leads to denaturation of proteins and suppression of the vital activity of the microorganism. This effect is us! to prevent contamination of activat! carbon with pathogenic microflora, especially in small filters us! in everyday life. For the bactericidal action of activat! carbon to manifest, a sufficiently long contact time of the purifi! water with the filler is requir!. The working with brand reputation and audience loyalty of silver does not affect the dechlorinating and adsorption capacity of the carbon.
Application of activat! carbons in gold mining industry
Pumping the gold cyanide solution through fine-por! activat! carbon results in the recovery of gold and its what role will ai play in the future of seo? on the carbon. After contact with the gold suspension for 20–60 min. (usually 30 min.), the granular carbon is separat! by filtration, and the suspension, partially fre! from gold, is pump! into the next container with granular carbon.
Gold is concentrat! on the activat! carbon in several stages (usually four), with the carbon book your list replac! once a day. While the first filter is being clean! by extraction and reactivat!, the remaining filters operate in a sequential mode.
The residual gold content in the activat! carbon
Filter! at the last stage is extract! with a 1% solution of caustic soda containing about 0.2% sodium cyanide at 80 °C for 50 h. In such a process, carri! out in countercurrent, it is possible to extract up to 150 mg of gold per 1 kg of carbon. The coal is then reactivat! at 650°C. Fine-por! granular coal with high strength characteristics is us! in such processes.