Outotec Oyj

Harri Natunen

Pekka Taskinen

Jens Nyberg

Heikki Takala

Aimo Järvinen

Heljä Peltola

Panu Talonen

Yrjö Oinonen

Kai Judin

Jorma Panula

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 removal of mercury from gas containing sulphur dioxide and oxygen and from the sulphuric acid vapour contained in the gas. According to the method, the gas is washed with a water solution that contains selenium ions, whereby metallic selenium is formed in the presence of oxygen, which precipitates the mercury in the gas and vapour either as a selenide or in a chlorine-containing environment, as a dichloride of mercury and selenium. Gas washing occurs at a low temperature, below 50&#xb0; C.

Method for removing mercury from gas

Growing community of inventors

Kokkola, Finland

Harri Natunen