Method for the preparation of fine grain ores

C - Chemistry – Metallurgy – 22 – B

Patent

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Details

C22B 1/00 (2006.01) C21B 13/00 (2006.01) C22B 1/10 (2006.01) C22B 1/24 (2006.01) C22B 7/00 (2006.01)

Patent

CA 2378956

The invention concerns a method for the preparation of fine-grain ore (2) in which the ore (2) is subjected to wind screening using a gas. Two fractions are formed (6, 8): a crude fraction (6) and a primary fine fraction (8), whereby the crude fraction (6) is ejected (6) and the primary fine fraction (8) is carried along by the gas, then deposited out of the gas and at least the majority thereof this is processed together with the crude fraction (6). The primary fine fraction is subjected again to a wind screening (8) using a gas which results in the deposition of a secondary fine fraction (18) and is processed together with the crude fraction (6). An ultrafine fraction (19) is carried along with the gas and then deposited out of the gas. In the subsequent processing steps which the fine grain ore (2) is subjected to, caking and sticking which can be caused by the ultra-fine fraction (19), can be avoided.

L'invention concerne un procédé de traitement de minerai (2) à grains fins, ledit minerai (2) étant soumis à un criblage à l'air à l'aide d'un gaz, ce qui donne lieu à la formation de deux fractions (6, 8), à savoir une fraction sommaire (6) et une première fraction fine (8). La fraction sommaire (6) est séparée et la fraction fine (8) est entraînée avec le gaz, puis séparée du gaz et acheminée au moins en grande partie conjointement avec la fraction sommaire (6) jusqu'à un poste de traitement. La première fraction fine (8) est soumise à un autre criblage à l'air avec un gaz. Une seconde fraction fine (18) est séparée et acheminée conjointement avec la fraction sommaire (6) jusqu'au poste de travail et une fraction ultrafine (19) est entraînée avec le gaz, puis séparée du gaz, ce qui permet d'éviter l'apparition de phénomènes de collage et d'adhérence inhérents à la fraction ultrafine (19) dans les processus subséquents de traitement du minerai (2) à grains fins.

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