Microwave dielectric properties and thermochemical characteristics of the mixtures of walnut shell and manganese ore

Li, Kangqiang; Chen, Jin; Chen, Guo; Peng, Jinhui; Ruan, Roger; Srinivasakannan, C.

doi:10.1016/j.biortech.2019.121381

Cited by 82 publications

(35 citation statements)

References 23 publications

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“…The loss factor increased rapidly from 500 to 700°C, due to formation of ZnFe 2 O 4 and ZnO. Then the zinc ferrite decomposes to release SO 2 , which causes the volume expansion of the zinc sulfide concentrate in the quartz tube, which reduces the density and dielectric properties of the zinc sulfide concentrate 31 . From 750 to 850°C, the dielectric loss factor of zinc sulfide concentrate increase rapidly with the increase of temperature, which may be due to the formation of ZnFe 2 O 4 and Zn 2 SiO 4 .…”

Section: Resultsmentioning

confidence: 99%

Microwave absorption and roasting characteristics of zinc sulfide concentrate

Liu

Zhu

Zhang

et al. 2021

Asia-Pacific J Chem Eng

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A novel microwave roasting technology for formation of ZnO from zinc sulfide concentrate is presented. The dielectric properties and thermal behaviors of zinc sulfide concentrate and ZnS, CaO, MgO, ZnO, FeS, and ZnFe2O4, covering a temperature range of 25 to 1000°C at 2.45 GHz, are systematically investigated. The main microwave absorbing compounds are FeS and ZnS, while compounds like CaO, MgO, and SiO2 and other gangue exhibit poor absorbing properties. The sulfide concentrate temperature increase was divided into four stages, consistent with the dielectric properties. The morphology, phase and element contents of roasted were assessed covering the effect of roasting temperature, holding time, and particle size by SEM, XRD, and XRF. The optimal process conditions are roasting temperature 700°C, holding time 120 min, and the particle size less than 200 mesh. Microwave roasting mechanism shows microwave heat minerals (ZnS and FeS) selectively without heating gangue minerals (CaO, MgO, and SiO2), a significant temperature gradient develops between minerals. Thermal stress cause cracks effectively promote the dissociation of the monomers of useful minerals, increasing the interfacial area with O2, promoting the rate of desulfurization reaction. The work highlights harnessing microwave roasting as an effective and environmentally benign technology compared to conventional furnace technologies.

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Section: Resultsmentioning

confidence: 99%

Microwave absorption and roasting characteristics of zinc sulfide concentrate

Liu

Zhu

Zhang

et al. 2021

Asia-Pacific J Chem Eng

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“…The dried specimens were also introduced to the dielectric test device (Agilent-E5071C, MYWAVE) to measure the complex permittivity of manganese anode mud and the three pure components, from room temperature to 1000 °C, with 50 °C interval as a temperature variable J o u r n a l P r e -p r o o f 9 node. And the complex permittivity of the material can be obtained through four steps by cavity calibration, quartz empty tube calibration, charging and loading quartz tube test, and recalculation of the just measured complex permittivity [28][29]. More detailed information about the dielectric properties was presented in Supplementary material.…”

Section: Measurement Procedures Of Dielectric Properties and Heating Characteristicsmentioning

confidence: 99%

“…The ability of a material to absorb microwaves depends primarily on its dielectric properties, which are affected by the frequency of the electric field, temperature, moisture content and chemical composition etc., wherein temperature is particularly important. Ye et al [28] and Li et al [29] investigated the high-temperature dielectric properties of waste hydrodesulfurization catalysts and manganese ore-walnut shell mixtures, respectively, indicating that temperature has significant influence for dielectric properties of materials.…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties and thermal behavior of electrolytic manganese anode mud in microwave field

Chen

Peng

et al. 2020

Journal of Hazardous Materials

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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“… 27 , 28 Therefore, it has received extensive attention from domestic and foreign scholars. 29 − 32 Studies have found that Mn-based catalysts have higher low-temperature SCR activity, and the denitration effect can be improved by doping with other transition metals. 33 − 35 Li found that the supported Mn 2 O 3 SCR catalyst can achieve a higher nitrogen oxide removal rate at low temperatures (150–300 °C).…”

Section: Introductionmentioning

confidence: 99%

Ultrasonication-Assisted Preparation of a Mn-Based Blast Furnace Slag Catalyst: Effects on the Low-Temperature Selective Catalytic Reduction Denitration Process

et al. 2021

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Reducing costs and improving performance have always been hotspots in the field of catalyst research. In order to control the NO x in the low-temperature flue gas of nonpower industries, this paper studies the denitration performance of the ultrasonication-assisted preparation of Mn-based blast furnace slag selective catalytic reduction (SCR) low-temperature denitration catalysts. The catalyst was characterized by FT-IR, XRD, and SEM. The study found that ultrasound assistance can make the active components on the catalyst surface more uniformly dispersed and improve the catalytic activity of the catalyst. Under conditions of 80 W ultrasonic power and 20 min ultrasonic time, the denitration performance of the Mn-based blast furnace slag catalyst is optimal, and the NO removal rate is 2.5 times that of the unsonicated catalyst. This work clarified the mechanism of the effect of ultrasonic assistance on the Mn-based blast furnace slag catalyst and at the same time realized the utilization of solid waste resources and air pollution control.

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Microwave dielectric properties and thermochemical characteristics of the mixtures of walnut shell and manganese ore

Cited by 82 publications

References 23 publications

Microwave absorption and roasting characteristics of zinc sulfide concentrate

Microwave absorption and roasting characteristics of zinc sulfide concentrate

Dielectric properties and thermal behavior of electrolytic manganese anode mud in microwave field

Ultrasonication-Assisted Preparation of a Mn-Based Blast Furnace Slag Catalyst: Effects on the Low-Temperature Selective Catalytic Reduction Denitration Process

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