title: Recovery of iron from zinc leaching residue by selective reduction roasting with carbon.
abstract: The recovery of iron from zinc leaching residue by selective reduction roasting with carbon was studied. The effects of roasting temperature, duration time and mass ratio of carbon to residue on decomposition of ZnFe(2)O(4), iron recovery and iron grade were investigated based on thermodynamic calculation and phase composition analysis of zinc leaching residue. 58.6% of iron grade in magnetic concentrate and 68.4% of iron recovery were achieved after the residue roasted at 750°C for 1h under carbon to residue mass ratio of 4%. The phase composition of roasted residue indicated that the ZnFe(2)O(4) decomposed in four stages: reduction of ZnFe(2)O(4) to ZnO and Fe(3)O(4), reduction of Fe(3)O(4) to FeO, formation of Fe(0.85-x)Zn(x)O and reduction of FeO to Fe. A technological process for simultaneously recovering iron and zinc from zinc leaching residue is proposed.
authors.affiliation: Institute of Environmental Science & Engineering, School of Metallurgical Science and Engineering, Central South University, 410083 Changsha, Hunan, China.
authors.forename: Mi
authors.initials: M
authors.lastname: Li
authors.forename: Bing
authors.initials: B
authors.lastname: Peng
authors.forename: Liyuan
authors.initials: L
authors.lastname: Chai
authors.forename: Ning
authors.initials: N
authors.lastname: Peng
authors.forename: Huan
authors.initials: H
authors.lastname: Yan
authors.forename: Dongke
authors.initials: D
authors.lastname: Hou
mesh_terms: D002244:Carbon / Q000737:chemistry; D052203:Ferrosoferric Oxide / Q000737:chemistry; D006358:Hot Temperature; D007220:Industrial Waste; D007501:Iron / Q000737:chemistry / Q000302:isolation & purification*; D008669:Metallurgy; D010084:Oxidation-Reduction; D059027:Recycling / Q000379:methods*; D015032:Zinc / Q000737:chemistry*; D015034:Zinc Oxide / Q000737:chemistry
chemical_list: D007220:Industrial Waste; D002244:Carbon; D007501:Iron; D015032:Zinc; D015034:Zinc Oxide; D052203:Ferrosoferric Oxide