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Agglomeration and bonding mechanism of typical metallurgical solid wastes

Journal of Iron and Steel Research International 2023年第7期30卷 1390-1400页

作者： Ting Wu Yu-qi Kong Jiu-chang Zhang Xin-yu Wang Lei Ma Tao Yang Jie Lei Hong-ming Long School of metallurgical Engineering Anhui University of TechnologyMa’anshan 243032AnhuiChina Key Laboratory of metallurgical Emission Reduction&Resources Recycling(Anhui University of Technology) Ministry of EducationMa’anshan 243032AnhuiChina

The agglomeration of solid wastes is a key factor for subsequent utilization,while the difficulty in agglomeration and high cost have become common problems in the recycling *** disk pelletizing process was adopted,based on the optimization method by liquid binder addition,and the influence mechanism of the ratio of typical solid wastes as blast furnace dust(BFD)and sludge generated by oxygen converter gas recovery(OGS)was ***,the effect of binder solution concentration on the quality of green pellets was *** from the contact angle detection and infrared spectrum analysis,the liquid bridge model was established to study the bonding *** results showed that OGS had stronger adsorption effect with binder,and the hydrophilicity of BFD was *** the concentration of binder was higher than 0.2 wt.%,the contact angle between the binder and BFD was bigger than that with OGS,while the capillary force between particles reduced with larger contact *** increment in the binder concentration increased the viscous force between particles and the maximum separation *** ultimate drop strength and compressive strength were related to the type of viscous force,and the compressive strength reflected the strength of the force between particles intuitively,while the drop strength represented the comprehensive forces of green *** combination of BFD and OGS was available for pelletizing process,while the ratio of BFD should not exceed 32.0%,and binder C was added in the form of solution with the addition amount of 0.4 wt.%,which can reduce the cost of binder by 20–30¥/t.

关键词： metallurgical solid waste Iron-bearing dust Organic binder Liquid bridge Green pellet

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Effect of quaternary basicity on reduction behavior of iron-bearing dust pellets

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Journal of Iron and Steel Research International 2023年第7期30卷 1356-1366页

作者： Tao Yang Jing-shu An Xing-wang Li Shuang Liu Xu Gao Lei Ma Jie Lei Hong-ming Long School of metallurgical Engineering Anhui University of TechnologyMa’anshan 243032AnhuiChina Key Laboratory of metallurgical Emission Reduction&Resources Recycling(Anhui University of Technology) Ministry of EducationMa’anshan 243002AnhuiChina

The treatment of iron-bearing dusts and sludges by the rotary hearth furnace process has the advantage of sufficient utilization of valuable metals and a high impurity removal rate,but the lower strength of the metallized product needs to be *** effects of quaternary basicity R4(w(CaO+MgO)/w(SiO_(2)+Al_(2)O_(3)))on the reduction behavior and physical and chemical properties of metallized pellets,including phase composition,compressive strength,microstructure and soft melting area,were investigated with FactSage thermodynamic software and *** strength of metallized pellets depended on the gangue composition,such as CaO,MgO,Al_(2)O_(3) and SiO_(2),due to the altered chemical composition,physical phase composition,microscopic morphology and stability of the slag *** reduction of carbon-bearing pellets was significantly promoted by suitable *** lower basicity(R_(4)1.8)also increased the amount of liquid phase and improved the strength of the pellets,due to the granular iron crystals bonded into ***,the main component of the liquid phase in high-basicity conditions was calcium *** the additional amount of liquid phase was beneficial to the strength of the metallized pellets,calcium disilicate was formed at R_(4)=1.6,resulting in a reduction in the compressive strength of the pellets to 1521.9 N/pellet.

关键词： metallurgical solid waste Iron-bearing dust Iron-bearing sludge Rotary hearth furnace Quaternary basicity Metallized pellet High-temperature performance Metallized pellet High-temperature performance

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