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Gao J.-T.,University of Science and Technology Beijing | Li S.-Q.,University of Science and Technology Beijing | Zhang Y.-L.,University of Science and Technology Beijing | Zhang Y.-T.,University of Science and Technology Beijing | And 2 more authors.
Ironmaking and Steelmaking | Year: 2012

A new process to recover iron and zinc from electric arc furnace (EAF) dust in a solid state has been developed. It comprises three steps: (1) reduction of dust (<1000°C) using gas reductant with high H 2 or CO content; (2) for the solid product of step (1), wet magnetic separation to separate Fe from gangue; and (3) for the condensed fumes collected in step (1), water washing to remove soluble compounds like KCl and enrich and recover the zinc oxide. The performance of this process indicates that four kinds of resources could be obtained, iron rich materials (TFe=92.3%); enriched zinc-rich materials (ZnO=83.7%); gangue produced in the wet magnetic separation, which can be used as a building material, and KCl solution. The process is greatly energy saving since it is carried out at low temperature so that sintering would not happen. This means that the iron can be separated directly by physical methods which avoid crushing and grinding. © 2012 Institute of Materials, Minerals and Mining.


Gao J.-T.,University of Science and Technology Beijing | Li S.-Q.,University of Science and Technology Beijing | Zhang Y.-L.,University of Science and Technology Beijing | Zhang Y.-T.,University of Science and Technology Beijing | And 2 more authors.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2012

The characteristics of dust obtained from different steelmaking enterprises were systematically studied. A new process for separating and enriching zinc from metallurgical dust at low temperature was developed. Based on the volatilized thermodynamics analysis and dynamics reduction experiment of pure ultra-fine ZnO, the experimental study on non-molten reduction and recovery and enrichment of zinc in dusts was carried out. The results show that zinc oxide is reduced to metallic zinc, using high-purity CO or H 2 as the reducing agent at 800-900°C, and the de-zincing rate is over 99%. The collected gaseous reduction products are washed to get rid of K, Cl and other elements, then the enrichment, called Zn-rich material, is obtained with the content of Zn up to 90%. At the same time, the dusts are reduced at the state of non-molten because of low temperature, and the metallization of Fe in product of solid-state reduction is as high as 90%. Furthermore, the solid-state high-purity iron can be directly separated physically.


Gao J.-T.,University of Science and Technology Beijing | Li S.-Q.,University of Science and Technology Beijing | Zhang Y.-T.,University of Science and Technology Beijing | Zhang Y.-L.,University of Science and Technology Beijing | And 3 more authors.
Journal of Iron and Steel Research International | Year: 2011

The process of " re-resourcing of converter slag" was put forward based on the analysis of the existing steel slag treatment process. The converter slag obtained from Jinan steel plant was studied. After grinding, the slag contained 3.3% of iron particles, 54.84% of magnetic part (ω TVe = 20%), and 41.84% of non-magnetic part, which could be used for making cement directly. At a temperature below 1000 °C, the non-magnetic Fe 2 O 3 in the slag could be efficiently reduced to magnetic iron by pure H 2 and CO. The slag after precise reduction had high degree of dispersion and did not get sintered, which provided an optimum condition for the separation of iron and impurities. To separate the slag and enrich the iron after reduction, the laboratory-scale device of magnetic separation was designed and made. The process of slag re-resourcing, which included magnetic sorting, precise reduction, magnetic separation, and removal of free calcium oxide (f-CaO), was proposed to obtain iron-rich magnetic materials and cement adulterant materials. Through this process, 33 kg iron particles, 150 kg iron-rich material and 700 kg cement could be obtained in each ton slag. Besides, this process to recycle converter slag had a lower energy and material consumption and no pollutant emission. © 2011 Central Iron and Steel Research Institute.


Chen P.-Y.,University of Science and Technology Beijing | Chen P.-Y.,Tianjin Pipe Corporation | Gao J.-T.,University of Science and Technology Beijing | Li S.-Q.,University of Science and Technology Beijing | And 3 more authors.
Sichuan Daxue Xuebao (Gongcheng Kexue Ban)/Journal of Sichuan University (Engineering Science Edition) | Year: 2011

According to the prevailing process of blast-furnace ironmaking and oxygen-converter steelmaking, a new technique named "precise reduction of Iron Oxide-separation of non-molten" was brought up. The equipment of the precise reduction was designed and improved, and L16(215) and L4(23) orthogonal table was planed, which were used in the experimental study of the precise reduction of magnetite in Kazuo and the steel dust of a factory. The results of the precise reduction showed that in the atmosphere of pure H2 and 100% CO, the iron oxide at the micron size can be reduced to metallic iron with high reduction degree. The study on dissociation, sintering, iron magnetic for the precise reduction product of iron oxide showed that the lower reduction temperature makes it possible for the iron oxide reduced to the magnetic metallic iron at the non-melting state. The reduction of product keeps power state and its interparticle sintering does not occur, which means that it is reasonable to separate iron from other impurity elements through the physical method.


Yang L.-Z.,University of Science and Technology Beijing | Wang X.-Y.,Tianjin Pipe Corporation | Wang Z.-D.,Tianjin Pipe Corporation | Wang Z.-X.,Tianjin Pipe Corporation
Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | Year: 2014

Alloy yield dynamic libraries were established based on self-learning of historical data and computer technology, through which accurate real-time alloy yield was obtained. Alloy charging optimization model was established for the First Steel-Making Plant of Tianjin Pipe Co. Ltd using the two-stage simplex method. As the operation of steelmaking is online, the alloy yields of different steel grades are obtained, and the accuracy of dosage of the alloy is improved. By optimizing alloy charging, average cost of alloy charging for each steel grade has been reduced. The maximum of the cost reduced is 54.96 yuan·t-1, and the minimum is 8.57 yuan·t-1. The cost of alloy charging per ton steel was reduced by 6.76%-11.40%, and the average cost was reduced by 9.74%.

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