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Thesis AdvisorRoland Kammel
Degree Grantor中国科学院研究生院
Other AbstractThe effect of ultrafine grinding on the mineral solid nature and leaching rate has been tested with sphalerite, pentlandite and scheelite concentrates. The comminution experiments were performed with the Stirred Ball Mill unit (Attritor, Netzsch co. Fed.Rep.Germany). Attempt was made to see the feasibility of applying this technique in hydrometallurgical processes. The investigation about the changes of mineral solid nature induced by Attritor grinding was followed by electron microscopy, x-ray diffraction, DTA, IR spectrum and so on. The results reveal that the particle size of a few microns which can be achieved by this type of comminution leads in combination with the resulting surface energy state and the lattice defects to following substantial improvements of the leaching behaviour under atmospheric pressure: an increase of the zinc extraction from sphalerite concentrates from about 70% to above 95%, of the nickel extraction from pentlandite concentrate from 14% to above 74% and of tungsten extraction from scheelite concentrate from 8% to about 99%. Investigation in a zinc plant about the reduction of Fe(III)-ions in the zinc leach liquor with the haematite process show, that the reduction time can be significantly reduced by using Attritor grinding instead of unground concentrate. Because the energy consumption of Attritor grinding is much lower than that of other grinding Mill units, the ultrafine grinding in Attritor has a promising prospect for application in hydrometallurgical processes. This technique can be of commercial interest in combination in hydrometallurgical process steps.
Document Type学位论文
Recommended Citation
GB/T 7714
李希明. 超细磨矿对矿物固体性质和浸取速度的影响[D]. 中国科学院研究生院,1988.
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