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Title:
METHOD FOR TREATING HIGH-PHOSPHORUS OOLITIC IRON ORES
Document Type and Number:
WIPO Patent Application WO/2022/267190
Kind Code:
A1
Abstract:
Provided in the present invention is a method for treating high-phosphorus oolitic iron ores. The method comprises the following steps: A) mixing the high-phosphorus oolitic iron ores, a dephosphorizing agent and water, and pressing the mixture into pellets to obtain mixed pellets, wherein the dephosphorizing agent comprises calcium carbonate and calcium fluoride, and the mass ratio of the calcium carbonate to the calcium fluoride is 1: (0.15-0.30); B) drying the mixed pellets, and subjecting same to oxidizing roasting to obtain oxidized roasted pellets; C) subjecting the oxidized roasted pellets to reduction roasting in a reducing atmosphere to obtain reduced pellets; and D) isolating air from the reduced pellets, and cooling the reduced pellets to room temperature with the air isolated, followed by ore grinding-magnetic separation to obtain a reduced iron product. In the present invention, the technological process is simple, the removal rate of phosphorus from the high-phosphorus oolitic iron ores is high, the iron grade and recovery rate of the powdery reduced iron are high, and the reduction effect is not affected due to the change in the iron grade and phosphorus content of the raw ore within a certain range.

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Inventors:
HUANG WUSHENG (CN)
JIANG GONGYANG (CN)
YAN LI (CN)
SUN TICHANG (CN)
Application Number:
PCT/CN2021/111725
Publication Date:
December 29, 2022
Filing Date:
August 10, 2021
Export Citation:
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Assignee:
SINOSTEEL EQUIPMENT ENG CO LTD (CN)
UNIV BEIJING SCIENCE & TECHNOLOGY (CN)
International Classes:
C22B1/24; C21B13/00; C22B1/02
Foreign References:
CN105695734A2016-06-22
CN103789477A2014-05-14
CN104212929A2014-12-17
CN104451132A2015-03-25
CN110342481A2019-10-18
CN112226611A2021-01-15
CN104451016A2015-03-25
EP3374531A12018-09-19
JP2018197385A2018-12-13
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW (CN)
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