Outotec Oyj

Panu Talonen

Sigmund P Fugleberg

Pertti Pekkala

Aimo Järvinen

Harri Natunen

Yrjö Oinonen

Kai Judin

Marja Riekkola-Vanhanen

The invention relates to a method and apparatus for controlling a continuous metal removal in conjunction with a zinc preparation process, in which the metal removal is performed in one or more reactors (-), in conjunction with the reactor, the redox potential (-) and the acidity and/or basicity are measured, and based on the measurement results, the process variables (-) of the metal removal are adjusted towards the desired direction. According to the invention, the redox potential measurements (-) are performed from the sludge produced in the reactor in conjunction with the outlet pipe of the reactor outside the reactor, and the measuring instrument (-) is purified at predetermined intervals.

Method and apparatus for controlling metal separation

The invention relates to a method for the leaching of oxidized ores and in particular zinc ores. The ore, wherein the valuable metals are at least partially in silicate form, are routed to an acidic leaching stage in conditions where the silicate decomposes and the valuable metal ion comes into the solution. During leaching the silicate ion first dissolves, but simultaneously decomposes and is precipitated as silica.

Method for the precipation of silica in connection with zinc ore leaching

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Kokkola, Finland

Panu Talonen