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Preparation of ZnO Nanoparticles from Zn-containing rotary hearth furnace Dust

Journal of Wuhan University of Technology(Materials Science) 2022年第1期37卷 32-37页

作者： YAO Haiwei MA Han MAO Rui QIU Jiayong CHEN Chunyu JU Dianchun School of Metallurgy and Materials Engineering Jiangsu University of Science and TechnologyZhangjiagang 215600China Shagang Iron&Steel Research Institute of Jiangsu Province Zhangjiagang 215625China

To solve the problem of the low added value Zn-containing rotary hearth furnace(RHF)dust,two deep eutectic solvents(DESs)were employed,such as choline chloride-urea(ChCl-urea)and choline chloride-oxalic acid dihydrate(CC-OA)solvent and Zn-containing RHF dust(water-washed)as the research ***,we prepared ZnO nanoparticles using two DESs or their combination,namely,ChCl-urea(Method A),CC-OA(Method B),first CC-OA and then ChCl-urea(Method B-A)and first ChCl-urea and then CCOA(Method A-B),*** effects of these methods on the properties of as-obtained precursors and ZnO nanoparticles were investigated in *** results indicated that the precursor obtained by Method A was Zn_(4)CO_(3)(OH)_(6)·H_(2)O,and those by Methods B,B-A,and A-B were all ZnC_(2)O_(4)·2H_(2)***,the decomposition steps of the last three methods were *** ZnO contents of 95.486%,99.768%,99.733%,and 99.76%were obtained by Methods A,B,B-A,and A-B,*** A,B,and B-A led to the formation of spherical and agglomerated ZnO nanoparticles with normal size distributions,where Method B showed the best distribution with an average diameter 25 *** ZnO nanoparticles obtained by the Method A-B did not possess good properties.

关键词： rotary hearth furnace Zn-containing dust deep eutectic solvent ZnO nanoparticle

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rotary hearth furnace Process for Recycling Steelmaking Dust and Sludge

Rotary Hearth Furnace Process for Recycling Steelmaking Dust...

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第八届（2011）中国钢铁年会

作者： Daisaku Johbe Yuichi Sakurai Jyunpei Kikuta Plant ＆ Machinery Division Nippon Steel Engineering Co.Ltd. Japan 46-59 NakabaruKitakyushu-cityFukuoka804-8505 Japan

Nowadays, it is demanded the recycling of the dust and the sludge produced in the Steel Mill, because the raw material for the iron making is soaring and also i t ’s required the environmental protect ion and the energy-saving. For this demand, Nippon Steel Corporation and Nippon Steel Engineering Corporation has developed and commercialized rotary hearth furnace（RHF） process for recycl ing the dust and sludge from Steel Mill. However the dust, as the raw material of RHF, has some difficulties to treat by RHF. First is that the dust characteristics are easy to fluctuate, because they are produced from various locations such as Sinter, Blast furnace, Basic Oxygen furnace, and so on in Steel Mill, and also the characteristics of them can’t be controlled. So RHF to be treated them is difficult to keep the stable operat ion. This paper introduces the characteristics of our RHF, which has been recycling the various kinds of the dust and which achieve the stable operat ion and the high energy saving effect.

关键词： rotary hearth furnace reduct ion dust sludge zinc DRI recycle

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Online Modeling of Powerful Mixing-Ball Pressing System of rotary hearth furnace Based on Particle Filtering and RBF Network

Online Modeling of Powerful Mixing-Ball Pressing System of R...

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第35届中国过程控制会议

作者： Shaopu Wang Xianxia Zhang Tangchen Wang Lufeng Wang Shanghai Key Laboratory of Power Station Automation Technology School of Mechatronics and Automation Shanghai University

Steel plants annually produce a significant amount of dust and sludge containing Zn and Fe elements, leading to substantial waste of resources and environmental pollution. The rotary hearth furnace system offers the potential for reusing the dust and sludge to achieve waste recycling. To effectively control and optimize the rotary hearth furnace, it is essential to establish an accurate model of its powerful mixing-ball pressing system. Given the complexity and variability of working conditions, offline models are prone to increasing errors over time, whereas online models can automatically update parameters with new data to maintain their effectiveness. Therefore, this paper proposes an RBF-PF online modeling method that integrates Particle Filtering(PF) and Radial Basis Function(RBF) networks for modeling the powerful mixing-ball pressing system. The key principle involves using parameters such as RBF network weights as a state vector, utilizing the network itself as an observation equation, and employing particle filtering along with observation data to estimate the state for achieving online modeling. This article conducts modeling experiments using data collected from the rotary hearth furnace system at a steel plant. The results demonstrate that the proposed RBF-PF online model exhibits high accuracy, timely adaptability to changes in working conditions, and strong robustness.

关键词： rotary hearth furnace Powerful mixer RBF network Particle filtering Online modeling

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Experimental study and industrial demonstration on utilization of Fe,Ti and V from vanadium-bearing titanomagnetite ore sands

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Journal of Iron and Steel Research International 2019年第12期26卷 1295-1303页

作者： Jing Gu Li Wang De-hong Xia Feng Zhang Zhao-dong Qi Wen-qing Ao School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Advanced Ceramic and Refractories China Iron&Steel Research Institute GroupBeijing 100081China

In order to achieve highly efficient utilization of three valuable elements Fe,Ti and V simultaneously from vanadium-bearing titanomagnetite ore sands,an improved carbothermic reduction method was proposed and verified in both laboratory scale and industrial test-bed *** method combined the process of direct reduction and the process of further reduction and ***,pulverized coal injection was *** experimental tests,the effects of parameters such as carbon content in briquette,reduction duration and reduction temperature on the contents of metallic Fe and FeO as well as Fe metallization rate were *** results indicated that Fe metallization rate in the carbon-containing briquette could reach 75.83%.In the industrial test-bed tests,the effects of carbon content in briquette,reduction duration and reduction temperature were also investigated,*** addition,processes with and without pulverized coal injection were *** comparative analysis indicated that the content of TiO2 in titaniferous slag was increased by applying pulverized coal injection,and it can reach 82.5 wt.%.Meanwhile,the energy performance analysis showed that the equivalent electricity consumption of the test-bed dropped significantly to 2071 kWh per ton of slag,about 26.0%less than that of traditional ***,the investment payback of the test-bed is 3.4 *** experiments and industrial test-bed tests demonstrated that the proposed method has the advantages of highly efficient utilization,high energy efficiency as well as good economic performance.

关键词： Vanadium titanomagnetite Titaniferous slag rotary hearth furnace Direct reduction Industrial test-bed

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Removal Mechanism of Zn,Pb and Alkalis from Metallurgical Dusts in Direct Reduction Process

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Journal of Iron and Steel Research International 2014年第5期21卷 488-495页

作者： Xue-feng SHE Jing-song WANG Guang WANG Qing-guo XUE Xin-xin ZHANG State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing School of Mechanical Engineering University of Science and Technology Beijing

The high-temperature tube furnace was applied to simulate the rotary hearth furnace （RHF） for the direct reduction of zinc-bearing dusts from steel plants. The removal mechanism of Zn, Pb and alkalis from cold bonded briquettes made by mixing metallurgical wastes, such as dust from bag house filter, OG sludge, fine converter ash and dust from the third electric field precipitator of the sinter strand, in various proportions was investigated. More than 70% of metallization rate, more than 95% of zinc removal rate, 80% of lead removal, as well as more than 80M of K and Na removal rates were achieved for the briquettes kept at 1473-1603 K for 15 min during the direct reduction process respectively. The soot generated in the direct reduction process was studied by chromatography, X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The results suggested that the main phases of the soot were ZnO, KC1, NaC1 and 4ZnO · ZnC12 · 5H20. Furthermore, the content of Zn reached 64.2 %, which could be used as secondary resources for zinc making. It was concluded that KC1 and NaC1 in secondary dust resulted from the volatilization from the briquettes, whilst ZnO and PbO were produced by the oxidation of Zn or lead vapour from briquettes by direct reduction.

关键词： rotary hearth furnace zinc-bearing dust direct reduction zinc removal

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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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