Patent ID: 6770207
Filing Date: 2004-08-03
Classification: B01F,B01J,C02F

Abstract:
A method for leaching of solid matter from a sludge of metal concentrate aided by a gas containing oxygen, comprising leaching the solid matter from the sludge in a tubular reactor, with a height at least two times greater than its diameter and which is equipped with a concentric central pipe and a double action mixer having upper blades and lower blades, forming a downward directed sludge flow in the central pipe with the aid of upper-curved blades of the mixer, the mixer being located upward from the bottom of the reactor in the immediate vicinity of the lower edge of the central pipe, turning the direction of sludge flow outside the central pipe in the bottom part of the reactor to an upward flow while feeding and dispersing an oxygen-containing gas into the sludge in the form of small bubbles to prevent solid matter in the sludge from settling to the bottom of the reactor.