The invention provides a method for preparing high-purity
iron oxide with converter dedusting ash using a superconduction high gradient
magnetic separation (HGMS) technology. According to the method, the HGMS technology is used for separating the converter dedusting ash so that the
iron oxide can be extracted, then the
iron oxide is roasted to prepare high-purity iron
oxide red, and cyclic utilization of the converter dedusting ash at the outside of a
steel mill can be realized; and moreover, the additional value of the iron
oxide red is high, large-scale and high-additional-value
resource utilization of waste is achieved, iron elements can be enriched to 65% or above, the number reaches 93% or above when the iron elements are converted into Fe2O3, and the
recovery rate of the iron elements reaches 95% or above. The method for preparing the high-purity iron
oxide with the converter dedusting ash using the superconduction HGMS technology has ultrahigh separation and extraction capacity and ultralow
energy consumption (the
energy consumption accounts for 1 / 10-1 / 4 that of a conventional
magnetic separation method), the effect is good and energy can be saved obviously; and the method is particularly suitable for enrichment, separation and extraction of the iron elements in iron-containing
solid powder such as the converter dedusting ash.