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Crystallization and viscosity-temperature characteristics during co-gasification of industrial sludge and coal

Frontiers in Energy 2022年第6期16卷 1037-1047页

作者： Linmin ZHANG Bin LIU Juntao WEI Xudong SONG Yonghui BAI Jiaofei WANG Ying ZHOU Huijun YANG Guangsuo YU State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering College of Chemistry and Chemical EngineeringNingxia UniversityYinchuan 750021China Joint International Research Laboratory of Biomass Energy and Materials Co-Innovation Center of Efficient Processing and Utilization of Forest ResourcesCollege of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China Institute of Coal Chemical Industry Technology Ningxia Coal Industry Co.Ltd.Yinchuan 750000China Institute of Clean Coal Technology East China University of Science and TechnologyShanghai 200237China

Co-gasification of industrial sludge(IS)and coal was an effective approach to achieve harmless and sustainable utilization of *** long-term and stable operation of a co-gasification largely depends on fluidity of coal-ash ***,the effects of IS addition on the crystallization and viscosity of Shuangmazao(SMZ)coal were investigated by means of high temperature stage coupled with an optical microscope(HTSOM),a scanning electron microscopy coupled with an energy dispersive Xray spectrometry(SEM-EDS),X-ray diffraction(XRD),a Fourier transform infrared spectrometer(FTIR),and FactSage *** results showed that when the proportion of IS was less than 60%,with the addition of IS,the slag existed in an amorphous *** was due to the high content of SiO_(2) and Al_(2)O_(3) in SMZ ash and blended ash,which had a high glass-forming ability(GFA).The slag formed at a high temperature had a higher polymerization degree and viscosity,which led to a decrease in the migration ability between ions,and ultimately made the slag difficult to crystallize during the *** the proportion of IS was higher than 60%,the addition of IS increased the CaO and FeO content in the *** network modifiers,CaO and FeO could provide O^(2−)at a high temperature,which reacted with silicate network structure and continuously destroyed the complexity of network structure,thus reducing the polymerization degree and viscosity of *** this time,the migration ability between ions was enhanced,and needle-shaped/rod-shaped crystals were precipitated during the cooling ***,the viscosity calculated by simulation and Einstein-Roscoe empirical formula demonstrated that the addition of IS could significantly improve the fluidity of coal ash and meet the requirements of the liquid slag-tapping *** purpose of this work was to provide theoretical support for slag flow mechanisms during the gasifier slagging-tapping process and the resource treatment of industrial s

关键词： co-gasification industrial sludge crystallization viscosity mineral matter evolution

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Ultrasonic Enhancement of industrial sludge Settling Ability and Dewatering Ability

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Tsinghua Science and Technology 2006年第3期11卷 374-378页

作者：张光明张盼月陈言明 Shenzhen Graduate School Tsinghua University Shenzhen 518055 China Department of Environmental Science and Engineering Hunan University Changsha 410082China School of Architecture and Resource Nanhua UniversityHengyang 421001 China

This paper investigates the treatment of chromium （Cr） contaminated industrial sludge from a tanning process with ultrasound to enhance the sludge settling ability and dewatering ability. Ultrasound at various frequencies, intensities, and time was tested to optimize the operation. The results show that treatment with 30 kHz, 12 W/L ultrasound for 120 s shortened the sludge settling time from 3 h to 1 h and reduced the supernatant Cr concentration. The ultrasonic treatment also reduced the sludge volume from 4.02 mL/g to 2.58 mL/g and increased the sludge Cr concentration by 2/3. The treated sludge could then be reused in the tanning operation. Proper ultrasonic treatment can significantly reduce the sludge volume and enhance the Cr reuse.

关键词： ultrasound industrial sludge sludge volume Cr

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Rapid recovery of rare earth elements in industrial wastewater by CuFe_2O_4 synthesized from Cu sludge

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Journal of Rare Earths 2018年第5期36卷 513-520页

作者： Yao-Jen Tu Cliff T.Johnston Institute of Urban Study Shanghai Normal University Shanghai 200234 China Crop Soil and Environmental Sciences Purdue University 915 W. State Street West Lafayette IN 47907 USA

This study systematically evaluates the recovery of rare earth elements（REEs） from aqueous solution and industrial wastewater using magnetic nanoparticles CuFe2O4. The industrially manufactured CuFe2O4 displays a nonlinear isotherm for REEs adsorption, suggesting limiting binding sites on the CuFe2O4 surface. The recovery of REEs increases significantly from 0.1% to 99.99% with increasing pH（2.29-8.15）. At room temperature, the maxima recovery rates of Nd, La, and Ce are observed to be in a high capacity of 51.02, 42.02, and 40.16 mg/g, respectively. No significant attenuation of REE adsorption is observed with increasing NaCl concentration from 0.001 to 1.0 mol/L, showing high selectivity of REEs even in such high NaCl concentration matrix. In addition, desorption efficiency increases with the increasing concentration of HNO3 in the range of 0.005-0.05 mol/L. When HNO3 concentration is over 0.05 mol/L, the desorption efficiency can reach almost 100% in each batch experiment. Importantly, our results show that REEs can be sorbed and recycled from liquid crystal display（LCD） polishing wastewater, suggesting that CuFe2O4 may be a good candidate in the efficient and rapid recovery of REEs from industrial wastewater.

关键词： Rare earth elements industrial wastewater industrial sludge Magnetic separation CuFe2O4

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