Outotec Oyj

Outotec (filters) Oy

Yrjö Oinonen

Aimo Järvinen

Leena Tanttu

Janne Kauppi

Harri Natunen

Panu Talonen

Kai Judin

Methods and equipment for preparing a precoat on the surface of a filter medium of a polishing filter. A feature in the invention is that in the polishing filter, the precoat is formed either exclusively or jointly from the underflow created in the separation process.

Method for preparing a precoat on the surface of the filter medium of a polishing filter, polishing filter and use of a polishing filter

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

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Kokkola, Finland

Yrjö Oinonen