Iron separation method for rotary kiln slag
A rotary kiln and iron separation technology, applied in chemical instruments and methods, wet separation, solid separation, etc., can solve the problems of reduced blast furnace utilization coefficient, low value of iron ore concentrate, increased coke ratio, etc., and achieves strong adaptability of raw materials. , the effect of considerable profit margins and low production costs
Inactive Publication Date: 2018-10-12
萍乡市拓源实业有限公司
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Problems solved by technology
[0002] Some domestic iron and steel fume treatment enterprises have carried out beneficiation treatment on rotary kiln slag to obtain iron concentrate with Tfe>65%. However, due to the high content of silicon and aluminum in iron concentrate, the utilization factor of blast furnace is reduced and the coke ratio is increased.
Therefore, the value of iron concentrate is low, the added value of products is low, and the metallic iron in the kiln slag has not been rationally utilized
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment
[0017] A method for selecting iron from rotary kiln slag, selecting iron according to the following specific steps:
[0018] 1) Sieve the rotary kiln slag to obtain fine slag with particle size less than 15cm;
[0019] 2) The fine slag from step 1) is ball-milled to a particle size of 1-5mm, and then the first-level magnetic separation is performed, and the magnetic field strength is 3500GS;
[0020] 3) The first-level concentrate balls obtained after step 2) first-level magnetic separation are subjected to second-level magnetic separation, and the magnetic field strength is 4000GS;
[0021] 4) Ball mill the secondary concentrate obtained after step 3) secondary magnetic separation until the particle size is less than 1mm;
[0022] 5) Sorting the secondary concentrate shaker after step 4) ball milling to obtain iron-containing concentrate, medium ore and tailings;
[0023] 6) After the medium ore in step 5) is subjected to single-stage magnetic separation with a magnetic fie...
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Abstract
The invention discloses an iron separation method for rotary kiln slag. The iron separation method comprises the following specific steps that (1) the rotary kiln slag is sieved to obtain fine slag with the grain diameter being less than 15 cm; (2) the fine slag in the step (1) is subjected to ball milling until the grain diameter is 1-5 mm and then subjected to primary magnetic separation; (3) secondary magnetic separation is conducted; (4) ball milling is conducted until the grain diameter is 1 mm; (5) separation by shaking table is conducted to obtain iron-contained concentrate, middlings and tailings; and (6) raw materials are recycled, the iron-contained concentrate is dehydrated and dried, and iron-contained concentrate with the iron content being larger than 88 wt% can be prepared.According to the iron separation method, the iron content of the low-grade rotary kiln slag can be increased to 88 wt% or above, and the powder metallurgy requirements are met.
Description
technical field [0001] The invention relates to the technical field of mineral processing, in particular to an iron separation method for rotary kiln slag. Background technique [0002] Some domestic iron and steel fume treatment enterprises have carried out beneficiation treatment on rotary kiln slag to obtain iron concentrate with Tfe>65%. However, due to the high content of silicon and aluminum in iron concentrate, the utilization factor of blast furnace is reduced and the coke ratio is increased. Therefore, the value of iron concentrate is low, the added value of products is low, and the metallic iron in the kiln slag has not been rationally utilized. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the above shortcomings of the prior art: to provide an iron selection method for rotary kiln slag that can increase the iron content of low-grade rotary kiln slag to above 88wt% and meet the requirements of pow...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B03B7/00B03B9/04
Inventor 张德生
Owner 萍乡市拓源实业有限公司