Method for recovering iron concentrates from alumina red mud

Abstract

The invention provides a method for recovering iron concentrates from alumina red mud, adopting the following technical scheme: a medium-intensity magnetic separator is adopted to recover the stronglymagnetic iron concentrates after red mud tailings are subjected to slag separation, then the obtained tailings are subjected to open rough separating and refined separating by a high gradient magnetic separator to recover weakly magnetic iron concentrates, combining the strongly magnetic iron concentrates and the weakly magnetic iron concentrates and carrying out dehydrating to obtain the iron concentrates. An slon vertical ring pulsating high gradient magnetic separator is selected to replace the traditional high gradient magnetic separator, and the medium-intensity magnetic separator is adopted to recover the strongly magnetic iron concentrates before. The method provided by the invention can be used for efficiently recovering the iron concentrates from the alumina red mud, and the obtained iron concentrates have high grades and good recovery rate; therefore, the method increases the utilization ratio of the alumina red mud, reduces the environmental pollution and is suitable for large-scale application.

Description

technical field [0001] The invention relates to a method for recovering iron concentrate from alumina red mud. Background technique [0002] Alumina red mud (Bayer red mud) has high iron content. Based on the annual production of 300,000 tons of alumina projects, the annual discharge of Bayer red mud is 350,000 to 400,000 tons, of which 60,000 to 80,000 tons of iron are contained. Comprehensive recycling will inevitably lead to the loss of iron resources in red mud, and will also increase the pressure of environmental pollution. [0003] The iron content of red mud in alumina production is 18-35%, and the mineral particle size in red mud is relatively fine. The yield of fine particle size less than 0.02mm accounts for more than 65%, the yield of less than 0.01mm accounts for 58%, and the yield of less than 0.005 The yield of mm accounts for more than 50%. The iron grade of the coarse and fine products of each particle size has little change, but the fine particle size acco...

AI Technical Summary

Problems solved by technology

For example, ZL 200410023997.9 discloses a method for selecting iron ore from red mud. First, the red mud is pretreated to remove fine red mud to obtain red mud sand. Although the removal of fine red mud is beneficial to the subsequent magnetic separation, it is bound to Most of the magnetic minerals smaller than 0.01mm will be lost, which seriously affects the recovery rate of iron minerals

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