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Decomposition behavior of CaSO_4 during potassium extraction from a potash feldspar-CaSO_4 binary system by calcination

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Chinese Journal of Chemical Engineering 2018年第4期26卷 838-844页

作者： Li Lü Chun Li guoquan zhang Xiaowei Hu Bin Liang School of Chemical Engineering Sichuan University

The extraction of potassium from a tablet mixture of K-feldspar ore and CaSO4by roasting was studied with a focus on the effects of the decomposition behavior of CaSO4on the potassium extraction *** roasted slags were characterized by X-ray diffraction（XRD）,scanning electron microscopy（SEM）,energy-dispersive X-ray spectroscopy,and thermogravimetric（TG）*** XRD analysis revealed that hydrosoluble mischcrystal K2Ca2（SO4）3was obtained by ion exchange of Ca^2＋ in CaSO4 and K^＋ in ***,the intermediate product,SiO2,separated from KAl Si3O8and reacted with CaSO4to decompose *** SEM results showed that some blowholes emerged on the surface of the CaSO4particles when they reacted with SiO2at 1200℃,which indicates that SO2and O2gases were released from *** TG curves displayed that pure CaSO4could not be decomposed below 1200℃,while the mixture of K-feldspar ore and CaSO4began to lose weight at 1000℃.The extraction rate of potassium and decomposition rate of CaSO4were 62%and 44%,respectively,at a mass ratio of CaSO4to K-feldspar ore of 3：1,temperature of 1200℃,tablet-forming pressure of6 MPa,and roasting time of 2 *** decomposition of CaSO4reduced the potassium extraction rate;therefore,the required amount of CaSO4was more than the theoretical ***,excess CaSO4was also undesirable for the potassium extraction reaction because a massive amount of SO2and O2gas were derived from the decomposition of CaSO4,which provided poor contact between the *** SO2released from CaSO4decomposition can be effectively recycled.

关键词： K-feldspar Calcium sulfate Potassium extraction Calcium sulfate decomposition Roasting

Two-stage cyclic ammonium sulfate roasting and leaching of extracting vanadium and titanium from vanadium slag

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Chinese Journal of Chemical Engineering 2022年第7期35卷 39-47页

作者： Qing Lin guoquan zhang Kun Wang Dongmei Luo Siyang Tang Hairong Yue School of Chemical Engineering Sichuan UniversityChengdu 610065China

Compared with traditional sodium or calcification roasting process for vanadium extraction from raw vanadium slag(V-slag),ammonium sulfate(AS)roasting could reduce about 470℃ roasting temperature and avoid Cl_(2),HCl,sodium-containing waste-water and waste gypsum *** reduce the amount of AS added in vanadium extraction process,an efficient AS two-stage cyclic roasting and acid leaching process was *** result of TG analysis indicates V-slag could be decomposed in 275-380℃ using AS roasting *** 2.03:1 total mass ratio of AS to V-slag,90.86%V and 80.54%Ti could be extracted after 380℃ roasting for 30 min and 8%initial concentration of H_(2)SO_(4) leaching at 70℃ for 100 *** analysis indicates V-containing spinel phase in the 1st stage leaching residue would be efficiently decomposed by the cyclic two-stage roasting and leaching ***,the valence of V(Ⅲ)in raw V-slag was not changed after the 1st AS roasting stage,but a part of V(Ⅲ)in the 1st leaching residue was oxidized to V(V)after 2nd roasting process.

关键词： Vanadium Titanium Roasting Leaching

Separation of lithium and nickel using ionic liquids and tributyl phosphate

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Chinese Journal of Chemical Engineering 2023年第11期63卷 63-70页

作者： Kun Wang guoquan zhang Linye Li Yuzhang Li Xiangxin Liao Pu Cheng Mingzhi Luo School of Chemical Engineering Sichuan UniversityChengdu 610065China

With the vigorous development of the electronics industry,the consumption of lithium continues to increase,and more lithium needs to be mined to meet the development of the *** content of lithium in the solution is much higher than that of minerals,but the interference of impurity ions increases the difficulty of extracting lithium ***,we prepared an imidazole-based ionic liquid(1-butyl-3-methylImidazolium bis(trifluoromethyl sulfonyl)imide)(IL)for efficient lithium extraction from aqueous solutions by solvent *** an extraction consisting of 10%IL,85% tributyl phosphate(TBP),and 5% dichloroethane and an organic to aqueous phase ratio(O/A)of 2/1,over 64.23% of Li were extracted,and the extraction rate after five-stage extraction could reach more than 96%.The addition of ammonium ions to the solution inhibited the extraction of Ni,and the separation coefficient between lithium and nickel approached infinity,showing a very perfect separation *** infrared spectroscopy and slope methods were used to analyze the changes that occurred during extraction,revealing possible extraction *** addition,the LiCl solution generated during the preparation of ionic liquids was mixed with the stripping solution,and the battery-grade lithium carbonate was prepared by Na_(2)CO_(3) precipitation,with a purity of 99.74%.This study provides an efficient and sustainable strategy for recovering lithium from the solution.

关键词： Ionic liquids Selective separation Solvent extraction Lithium

Mode characteristics of silver-coated inverted-wedge silica microdisks

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Science China(Physics,Mechanics & Astronomy) 2015年第11期58卷 40-44页

作者： BO Fang WANG XiaoOu LI Ying GAO Feng zhang guoquan XU JingJun The Key Laboratory of Weak-Light Nonlinear Photonics Ministry of Education TEDA Applied Physics Institute and School of PhysicsNankai University

The characteristics of whispering gallery modes(WGM) in silver-coated inverted-wedge silica microdisks are theoretically investigated by using finite element method. Dielectric TE mode always exists in silver-coated inverted-wedge resonators; dielectric TM mode tends to couple with SPP modes; only pure interior surface plasmonic polariton(SPP) mode but not pure exterior SPP mode is observed in contrast to the metal-coated cylindrical and toroidal resonators. The dependence of quality factor of different kinds of WGMs on the radius of the resonator and the thickness of the coated silver layer are systematically analyzed. We find that the quality factors of the hybrid WGMs associated with SPP mode can reach 104. The maximum light intensity enhancement in ambient for a hybrid mode consisting of a dielectric TM mode and an exterior SPP mode can be obtained when a silver film of thickness ~40 nm is deposited. The silver-coated inverted-wedge silica resonators may be widely applied in sensing and surface enhanced Raman scattering.

关键词： microcavity whispering gallery mode surface plasmonic polariton

Recovery of titanium,aluminum,magnesium and separating silicon from titanium-bearing blast furnace slag by sulfuric acid curing-leaching

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International Journal of Minerals,Metallurgy and Materials 2022年第9期29卷 1705-1714页

作者： Long Wang Liang Chen Weizao Liu guoquan zhang Shengwei Tang Hairong Yue Bin Liang Dongmei Luo College of Chemical Engineering Sichuan UniversityChengdu 610065China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China

An energy-efficient route was adopted to treat titanium-bearing blast furnace slag(TBBFS)in this ***,aluminum,and magnesium were simultaneously extracted and silicon was separated by low temperature sulfuric acid curing and low concentration sulfuric acid *** process parameters of sulfuric acid curing TBBFS were systematically *** the optimal conditions,the recovery of titanium,aluminum,and magnesium reached 85.96%,81.17%,and 93.82%,*** rapid leaching model was used to limit the dissolution and polymerization of silicon,and the dissolution of silicon was only 3.18%.The mechanism of sulfuric acid curing-leaching was *** the curing process,the reaction occurred rapidly and released heat *** the attack of hydrogen ions,the structure of TBBFS was destroyed,silicate was depolymerized to form filterable silica,and titanium,magnesium,aluminum,and calcium ions were replaced to form sulfates and enriched on the surface of silica ***,aluminum,and magnesium were recovered in the leaching solution,and calcium sulfate and silica were enriched in the residue after *** method could effectively avoid the formation of silica sol during the leaching process and accelerate the solid-liquid separation.

关键词： titanium-bearing blast furnace slag sulfuric acid curing silicon mechanism

Efficient second and third harmonic generation in dual-layer lithium niobate microdisk resonator

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Science China(Physics,Mechanics & Astronomy) 2024年第5期67卷 33-38页

作者： Zhenzhong Hao Xiao Wu Qiang Luo zhang Li Rui Ma Fang Bo Feng Gao guoquan zhang Jingjun Xu MOE Key Laboratory of Weak-Light Nonlinear Photonics TEDA Institute of Applied Physics and School of PhysicsNankai UniversityTianjin 300457China

Lithium niobate thin film frequency doubler has extensive applications in the preparation of classical and quantum *** this study,we successfully fabricated microdisk resonators with a quality factor of 2.2×10^(5) in reverse-polarization dual-layer x-cut lithium niobate for the first *** on the modal phase matching condition,efficient second harmonic generation with a record normalized conversion efficiency of~56000%W-1 and cascaded third harmonic generation with an efficiency of~6500%W-2 were obtained in the microdisk *** with the periodically poled lithium niobate microcavity,the complex domain structure preparation processes are *** work provides a scheme for achieving highly efficient second-order nonlinear effects in non-periodically poled microcavities.

关键词： harmonic lithium niobate

REE geochemical characteristics of the No. 302 uranium deposit in northern Guangdong, South China

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Chinese Journal Of Geochemistry 2007年第4期26卷 425-433页

作者： zhang guoquan HU Ruizhong BI Xianwu FENG Haisheng SHANG Pengqiang TIAN Jianji State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China China National Nuclear Shaoguan Jingyuan Uranium Industry Co. Ltd. Shaoguan 512329 China

The No. 302 uranium deposit, located in Guangdong Province, is a typical granite-type uranium ore deposit. REE geochemical characteristics of the wall rocks, pitchblende, altered rocks, calcite and fluorite from this deposit have been systematically studied in this paper. The result showed that the alkali-metasomatic granites and other altered rocks have the same REE distribution patterns as Indosinian granites. It is indicated that the hydrothermal ore-forming solution had altered the Indosinian granites, and ore-forming materials may directly originate from the Indosinian granites. Calcite and fluorite of different stages are the products derived from the same source but different stages. The evolution and degassing of the mineralizing solution might induce LREE enrichment to varying degree. Mantle fluid and a large volume of mineralizer may be the crucial factors controlling uranium mineralization, and the hydrothermal solution with mineralizer played an important role in U transport and concentration. Meanwhile, the degassing of CO2 might promote U and REE precipitation.

关键词：铀堆积物花岗岩矿石

Periodically poled lithium niobate whispering gallery mode microcavities on a chip

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Science China(Physics,Mechanics & Astronomy) 2018年第11期61卷 36-40页

作者： ZhenZhong Hao Li zhang Ang Gao WenBo Mao XiaoDan Lyu XiaoMei Gao Fang Bo Feng Gao guoquan zhang JingJun Xu MOE Key Laboratory of Weak Light Nonlinear Photonics TEDA Institute of Applied Physics and School of Physics Nankai University Tianjin 300457 China The Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan 030006 China

In this study, we investigate the fabrication of periodically poled lithium niobate(PPLN) microdisk cavities on a chip. These resonators are fabricated from a PPLN film with a 16 μm poling period on insulator using conventional microfabrication *** quality factor of the PPLN microdisk resonators with a 40-μm radius and a 700-nm thickness is 6.7×10~5. Second harmonic generation(SHG) with an efficiency of 2.2×10^(-6) mW(-1) is demonstrated in the fabricated PPLN microdisks. The nonlinear conversion efficiency could be considerably enhanced by optimizing the period and pattern of the poled structure and by improving the cavity quality factors.

关键词： whispering gallery mode periodically poled lithium niobate microcavities second harmonic generation

Simultaneous preparation of TiO2 and ammonium alum,and microporous SiO2 during the mineral carbonation of titanium-bearing blast furnace slag

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Chinese Journal of Chemical Engineering 2020年第9期28卷 2256-2266页

作者： Yingjie Xiong Tahani Aldahri Weizao Liu Guanrun Chu guoquan zhang Dongmei Luo Hairong Yue Bin Liang Chun Li School of Chemical Engineering Sichuan UniversityChengdu 610065China Department of Chemical and Biochemical Engineering Western UniversityLondonOntarioCanada Department of physics Taibah UniversityMadinahSaudi Arabia

In this study,a route for simultaneous mineralization of CO2 and production of titanium dioxide and ammonium alum,and microporous silicon dioxide from titanium-bearing blast furnace slag(TBBF slag)was proposed,which is comprised of(NH4)2 S04 roasting,acid leaching,ammonium alum crystallization,silicic acid flocculation and Ti *** effects of relevant process parameters were systematically *** re sults showed that under the optimal roasting and leaching conditions about 85%of titanium and 84.6%of aluminum could be extracted while only 30%of silicon entered the leachate.84%of Al^3+was crystallized from the leachate in the form of ammonium aluminum sulfate dodecahydrate with a purity up to 99.5 wt%.About 85%of the soluble silicic acid was flocculated with the aid of secondary alcohol polyoxyethylene ether 9(AEO-9)to yield a microporous SiO2 material(97.4 wt%)from the crystallized mother *** Al-and Si-depleted solution was then hydrolyzed to generate a titanium dioxide(99.1 wt%)with uniform particle size *** was figured out that approximately 146 kg TiO2 could be produced from 1000 kg of TBBF ***,the improved process is a promising method for industrial application.

关键词： CO2 mineralization Titanium-bearing blast furnace slag Ammonium sulfate Flocculation Titanium dioxide