Outokumpu Oyj

Yrj&ouml; Oinonen

Heikki Takala

Kurt H&ouml;glund

The present invention concerns equipment for the leaching of solid matter from a sludge with the aid of a gas containing oxygen, the said equipment comprising a tall reactor ( ) equipped with a central pipe ( ) and from the reactor bottom ( ), an upward-directed double-action mixer ( ). The mixer is situated in the vicinity of the lower edge of the central pipe: the upper blades ( ) of the mixer produce a downward suction flow from the central pipe, and the lower blades ( ) disperse the gas to be fed into the sludge in the form of small bubbles, thereby preventing the solid matter from settling to the bottom of the reactor.

Equipment for the leaching of solid matter from sludge

The invention relates to a method for the leaching of solid matter from a sludge with the aid of a gas containing oxygen, whereby the solid matter of the sludge is recirculated in a tall reactor equipped with a central pipe in the centre of the reactor and a double-action mixer located in the vicinity of the lower edge of the central pipe. A flow is formed with the aid of the mixer which sucks the sludge from the central pipe downward, and a gas to be conducted into the sludge in the bottom part of the reactor is dispersed in the form of small bubbles into the sludge outside the central pipe and the flow direction of the sludge is turned upwards in the outer casing of the reactor.

Growing community of inventors

Kokkola, Finland

Yrjö Oinonen

Growing community of inventors

Kokkola, Finland

Yrj&ouml; Oinonen

Yrjö Oinonen