Fine screening with electrically heated screen decks report over initial tests and their evaluation

• Minelco by LKAB, Technology and Business Development, has commissioned Mineral Processing at LTU to conduct a series of investigations with a new screening device hitherto not used by LKAB. The screen, Mogensen Sizer G054 with electrically heated decks, was during the trials located in the pilot plant at Mineral Processing, where a test station was built for it. The purpose of the investigations was to test some specific applications, and to prepare a standard test procedure for evaluating screening tests with a Mogensen Sizer. One application was the production of magnetite -1 mm from sinter fines, where very strong consolidation effects were discovered and had to be taken into consideration. Specifically, consolidated sinter fines with moisture content more than 1 % gave high losses.The tests show that the best way to evaluate the screening results is to plot the proportion of finished product, and the loss of the correct fraction as a function of feed rate and moisture content. These being quantity results, they need to be supplemented with quality parameters, and the best seem to be the weight percentage of too coarse and too fine particles in the finished product. The direct effect of the level of heat is not yet clear. There appears to be some threshold level for the heating, but to what extent this is related to the screen deck type, the heat capacity and density of the material, or the particle size, is not known.

Ämnesord

Engineering and Technology  (hsv)

Materials Engineering  (hsv)

Metallurgy and Metallic Materials  (hsv)

Teknik och teknologier  (hsv)

Materialteknik  (hsv)

Metallurgi och metalliska material  (hsv)

Mineralteknik  (ltu)

Mineral Processing  (ltu)