Outotec (Finland) Oy

Outokumpu Oyj

Metso Outotec Finland Oy

Jari Moilanen

Ari Rantala

Jaakko Leppinen

Kari Mann

Jani Kaartinen

Antti Remes

Ville Suontaka

Pertti Saviranta

A process for recovery of gold from gold-containing raw materials includes obtaining gold-containing raw material having refractory gold-containing sulfidic minerals including a first type of refractory sulfidic mineral having high gold content and a second type of sulfidic mineral having low gold content; forming a mineral pulp including a first type of refractory sulfidic mineral particles having high gold content and second type of sulfidic mineral particles having low gold content by suspending ground gold-containing material in water and optionally further milling the material; conditioning the mineral pulp by addition of a surface modifying chemical to obtain a conditioned pulp; subjecting the conditioned pulp to a froth flotation process; recovering the non-floatable first type of refractory sulfidic mineral particles having high cold content as flotation tailings; pressure oxidizing (POX) the flotation tailings to obtain a discharge slurry comprising liberated gold; and recovering gold from the discharge slurry.

Differential flotation of sulfide ores for recovering refractory gold

An arrangement for controlling a comminution process having a grinding circuit, includes an imaging system measuring 3D reconstruction measurement data for three-dimensional reconstruction of incoming ore; a particle size analysis equipment measuring particle size data for calculation of the particle size characteristic value of outgoing ore; an ore characteristics data calculation block receiving a particle size distribution profile of incoming ore and a particle size characteristic value of the outgoing ore, the particle size distribution profile being calculated and/or reconstructed from the 3D reconstruction measurement data for three-dimensional reconstruction, and the particle size characteristic value being calculated based on the measured particle size data, the ore characteristics data calculation block calculating ore characteristics data based on the particle size distribution profile and the particle size characteristic value; and a control block controlling the grinding circuit based on the calculated ore characteristics data.

Method and an arrangement for controlling of a comminution process having a grinding circuit

The invention relates to a sample flow control member to be used particularly in a continuously operated analysis of liquid or slurry-like materials, said control member being provided with members for selectively conducting the sample flow to an analyser. According to the invention, the control member (1, 21, 41) is installed in an essentially horizontal position and provided with at least one moving member (11, 28, 42) in order to turn the control member (1, 21, 41) around its rotation axis (12, 29, 48) in order to selectively conduct the sample flow to at least one analyser (7, 27; 44, 46) through at least one aperture (5, 25, 49) provided in the wall of the control member (1, 21, 41).

Sample flow control member

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Espoo, Finland

Jari Moilanen