Loading patent…
AssigneeMetso Outotec Finland Oy
InventorsJochen Güntner, Alexandros Charitos, Jörg Hammerschmidt
Estimating the term…
A process for roasting of metal concentrate wherein concentrate particles are fed into a roaster where they are thermally treated at a temperature in the range of 500 and 1200° C. in a fluidized bed to form a calcine. At least parts of the calcine are withdrawn from the roaster together with a gas stream as a solid fraction. Concentrate particles with a diameter at least 50% smaller than the average diameter of the concentrate particles are separated as small particles and/or particles from the gas-solid-fraction are separated in at least one step as small calcine particles and/or particles are gained in another hydrometallurgical step as other particles. Defined particles are pelletized, whereby at least 80% of the pellets feature a diameter of at least 80% of the concentrate particles average diameter. The pellets are fed into the roaster.
A process for roasting of metal concentrate, wherein concentrate particles are fed into a roaster where they are thermally treated at a temperature in a range of 500 and 1200° C. in a fluidized bed to form a calcine, at least parts of the calcine are withdrawn from the roaster together with a gas stream as a solid fraction, particles are gained in another hydrometallurgical step as other particles, at least parts of the other particles are pelletized, whereby at least 80% of pellets feature a diameter of at least 80% of an average diameter of the concentrate particles and the pellets are fed into the roaster so that the metal concentrate contains at least 45 wt.-% zinc, whereby the average diameter of the concentrate particles is between 5 and 40 μm, the metal concentrate contains at least 60 wt.-% pyrite, whereby the concentratc particles' average diameter of the concentrate particles is between 5 and 90 μm, the metal concentrate contains at least 2 g/t gold, whereby the average diameter of the concentrate particles is between 5 and 100 μm, the metal concentrate contains at least 15 wt.-% copper, whereby the concentrate particles' average diameter of the concentrate particles is between 10 and 50 μm, the metal concentrate contains at least 1 wt.-% cobalt, whereby the average diameter of the concentrate particles is between 5 and 40 μm, or the metal concentrate contains at least 100 g/t Platinum-Group Metals (PGMS), whereby the average diameter of the concentrate particles is between 20-100 μm.
Dependencies are inferred from the claim text.