Title:
METHOD FOR RECOVERING IRON BY MEANS OF COPPER SLAG CALCINATION AND MODIFICATION
Document Type and Number:
WIPO Patent Application WO/2020/077851
Kind Code:
A1
Abstract:
A method for recovering iron by means of copper slag calcination and modification. The method comprises: (2) maintaining a calcination temperature and inert gas protection, communicating a calcination system with ambient air, simultaneously introducing CO and CO2 gases into the calcination system in step (1) with the volume percentage of CO in the total gas components of CO and CO2 being 0-5%, oxidizing free ferrous oxide into ferroferric oxide, and enabling crystals of ferroferric oxide to grow; and (3) performing cooling after calcination is finished, performing ore grinding and grading to obtain modified slag of different particle sizes, and performing magnetic separation under a magnetic field to obtain iron ore concentrate and magnetic separation tailings. According to the method, iron in copper slag can be efficiently recovered by using industrial waste gases CO and CO2, so as to obtain iron ore concentrate suitable for use as an iron melting raw material and magnetic separation tailings suitable for use as a raw material for building materials such as cement.
Inventors:
JIANG PINGGUO (CN)
LIU JINSHENG (CN)
LIAO CHUNFA (CN)
QIU TTINXING (CN)
ZENG YANLIANG (CN)
LIU JINSHENG (CN)
LIAO CHUNFA (CN)
QIU TTINXING (CN)
ZENG YANLIANG (CN)
Application Number:
PCT/CN2018/123841
Publication Date:
April 23, 2020
Filing Date:
December 26, 2018
Export Citation:
Assignee:
UNIV JIANGXI SCI & TECHNOLOGY (CN)
International Classes:
C22B1/02
Foreign References:
| CN108048647A | 2018-05-18 | |||
| CN102260787A | 2011-11-30 | |||
| CN104404260A | 2015-03-11 | |||
| CN107460332A | 2017-12-12 | |||
| CN104593587A | 2015-05-06 | |||
| US20100242682A1 | 2010-09-30 |
Attorney, Agent or Firm:
BEIJING JIZHI INTELLECTUAL PROPERTY LIMITED et al. (CN)
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