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Influence of magnesium and aluminum salts on hydrolysis of titanyl sulfate solution

Transactions of Nonferrous Metals Society of China 2015年第10期25卷 3475-3483页

作者：方富强刘亚辉孟凡成王伟菁薛天艳齐涛中国科学院大学北京100049 中国科学院过程工程研究所湿法冶金清洁生产技术国家工程实验室北京100190 中国科学院过程工程研究所绿色过程与工程院重点实验室北京100190

The influence of magnesium and aluminum salts as impurities on the hydrolysis of titanyl sulfate was *** degree of TiOSO4 conversion to hydrated titanium dioxide（HTD） and the particle size of HTD were measured as functions of the concentrations of MgSO4 and Al2（SO4）3 in the TiOSO4 *** Boltzmann growth model,which focuses on two main parameters,namely the concentrations of Mg2＋ and Al3＋（ρ（Mg2＋） and ρ（Al3＋）,respectively）,fits the data from the hydrolysis process well with *** samples were characterized by ICP,SEM,XRD,and laser particle size *** is found that the addition of Mg SO4 simultaneously improves the hydrolysis ratio and the hydrolysis rate,especially when F（the mass ratio of H2SO4 to TiO2） is high,hydrolysis ratio increases from 42.8% to 83.0%,whereas the addition of Al2（SO4）3 has negligible effect on the chemical kinetics of HTD precipitation during the hydrolysis process,hydrolysis ratio increases from 42.8% to 51.9%.An investigation on the particle size of HTD reveals that the addition of Mg SO4 and Al2（SO4）3 clearly increases the size of the crystallites and decreases the size of the aggregates.

关键词： titanyl sulfate solution hydrolysis process growth model magnesium sulfate aluminum sulfate particle size

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Development of a High Early Strength Non-fuorine and Non-alkaline Flash Setting Admixture and Flash Mechanism

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Journal of Wuhan University of Technology(Materials Science) 2024年第6期39卷 1518-1527页

作者： SUN Guowen YANG Xinyu WANG Fengjuan WANG Jinshuo LIU Zhiyong College of Materials Science and Engineering Shijiazhuang Tiedao UniversityShijiazhuang 050043China College of Materials Science and Engineering Southeast UniversityNanjing 211189China

To solve the problems of high rebound rate and strength reversion of shotcrete,a non-fluorine and non-alkaline liquid flash setting admixture(FSN)with low rebound and high early strength was synthesized under 60-65℃water bath environment through orthogonal test design and taking setting time and compressive strength as *** experimental results show that the optimum mass ratio of FSN is aluminum sulfate:diethanolamine:triethanolamine:pseudo-boehmite:lithium carbonate:water=57%:8%:0.05%:2%:2%:31%.When FSN is added with 7%of the mass of portland cement,the cement paste can be initially set in 3 min and finally set in 5 *** compressive strength of mortar is 1.2 MPa at 6 h,18.0 MPa at 1 d,and more than 100%at 28 days;The microscopic analysis shows that the rapid release of Li^(+),NH^(4+),and CO_(3)^(2-)ions by FSN in the paste solution effectively shortens the induction period of high C_(3)S content in Portland cement,directly forms early coagulation AFt crystals in FSN and CH dominated by Al_(2)(SO_(4))_(3),and forms a large number of C-S-H gels in the later stage,so that the cement can quickly coagulate and harden,and the strength in the later stage is not retracted.

关键词： shotcrete flash setting admixture aluminum sulfate high early strength flash mechanism

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Advanced lignin-acrylamide water treatment agent by pulp and paper industrial sludge: Synthesis, properties and application

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Journal of Environmental Sciences 2013年第12期25卷 2367-2377页

作者： Hongyan Rong Baoyu Gao Yanxia Zhao Shenglei Sun Zhonglian Yang Yan Wang Qinyan Yue Qian Li Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and EngineeringShandong University

A novel flocculant LA （lignin-acrylamide polymer）, which was used as aid for aluminum sulfate and polyaluminum chloride in this study, was prepared by grafting acrylamide onto lignin that deriving from pulp and papermaking sludge. Physicochemical properties of LA were measured by X-ray photoelectron spectroscopy and scanning electron microscopy. The experimental outcome indicated acrylamide was grafted onto the lignin backbone successfully. The effects of LA addition were evaluated on coagulation performance and floc characteristics as a function of aluminum （Al） dosage, such as floc size, growth rate, strength and recoverability. Effects of different dosing sequences, Al dosed first and LA dosed first, were also investigated. LA used as coagulant aid markedly enhanced the removal efficiency of turbidity and dissolved organic carbon, especially at low Al dosages. The dissolved organic carbon removal efficiencies of aluminum sulfate and polyaluminum chloride at the Al dosage range selected in this study were improved more than 30% and 5% by LA, respectively. LA dramatically enlarged floc size and it was in the order： Al dosed first 〉 LA dosed first 〉 Al. Floc strength and recoverability were also improved by LA. LA played a significant role in charge neutralization, adsorption and bridging in floc formation.

关键词： pulp and paper industrial sludge graft copolymerization aluminum sulfate polyaluminum chloride floc characteristics

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Synthesis of Micro-Mesoporous Ti-MOR/Silica Composite Spheres in Oil-in-Water Microemulsion System

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Chemical Research in Chinese Universities 2022年第1期38卷 192-199页

作者： XU Hao WANG Yanhong PENG Rusi JIANG Jingang ZHANG Kun WU Peng Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200062P.R.China

The hierarchically structured micro-mesoporous spheres(MMS) composed of mesoporous silica and Ti-containing mordenite (Ti-MOR) zeolite were self-assembled in an oil-in-water microemulsion system containing tetrabutyl orthosilicate as silica source, cetyltrimethylammonium bromide as template and aluminum sulfate as additive. The composite materials possessed the connatural microporosity of zeolite together with the disordered mesopores(5.41 nm) in silica part. With a special focus on the importance of aluminum sulfate additive, a possible formation mechanism has been proposed, in which double electrostatic interactions played the crucial role of mediating the mesosilica species and zeolite crystals. The obtained MMS materials, with a tunable particle dimension(250-720 μm) and a changeable content of active component Ti-MOR(44%-70%), showed enhanced catalytic activity and lifetime in the liquid-phase ammoximation of cyclohexanone in comparison to the parent Ti-MOR powder.

关键词： Micro-mesoporous composite sphere Microemulsion Mordenite aluminum sulfate Double electrostatic interaction

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Effects of different soil amendments on physicochemical property of soda saline-alkali soil and crop yield in Northeast China

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International Journal of Agricultural and Biological Engineering 2022年第1期15卷 192-198页

作者： Fan Xiao Beibei Zhou Hongbin Wang Manli Duan Lei Feng State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China Xi’an University of TechnologyXi’an 710048China College of Resource and Environment Key Laboratory of Soil Resource Sustainable Utilization for Jilin Province Commodity Grain BasesJilin Agricultural UniversityChangchun 130118China HydroChina Zhongnan Engineering Corporation Changsha 410041China

Soil amendment is one of the most effective methods to improve saline-alkali *** this study,laboratory experiments were conducted to verify the effect of 13 kinds of amendments and their combinations(Citric acid(NM),Phosphogypsum(LS),aluminum sulfate+citric acid(AL+NM),aluminum sulfate+phosphogypsum(AL+LS),aluminum sulfate+citric acid+phosphogypsum(HH),Zeolite(Z),Acidified zeolite(ZH),aluminum sulfate(AL),aluminum sulfate+zeolite(AL+Z),aluminum sulfate+acidified zeolite(AL+ZH),Poly aluminum chloride(ALCL),Polyaluminium chloride+zeolite(ALCL+Z),Polyaluminium chloride+acidified zeolite(ALCL+ZH))on soil pH,metal cations content,exchangeable Na+,exchangeable sodium percentage(ESP)in the *** then the five most effective amendments(Z,ZH,AL,AL+Z,and AL+ZH)were chosen applying both in dry field(maize field)and paddy field to evaluate their improvement on soda saline-alkali soil and crop yield in the northeast Songnen Plain,*** lab results showed that AL,AL+Z and AL+ZH treatments could significantly reduce the pH in soil solution and increase the content of metal cations.Z and ZH treatments could adsorb metal cations in *** in dry and paddy fields,all five treatments could increase the soil saturated hydraulic conductivity(Ks),increased from 9.63 to 60.02 mm/d and 0.18 to 33.25 mm/d,respectively,of which the AL treatment was the best;all five treatments could reduce the content of exchangeable Na+in soil,and decrease by 38.62%-61.33%and 25.24%-71.53%,respectively,of which the AL+ZH treatment was the best;all treatments could reduce soil exchangeable sodium percentage,and decrease by 0.14-0.22 and 0.14-0.41,respectively,of which the AL+ZH treatment was the best;AL,AL+Z and AL+ZH treatments could improve soil organic matter content;all treatments could effectively improve the yield of crops,and increase 23.98%-60.75%and 52.51%-260.21%,respectively,of which the AL treatment was the best in dry field and the AL+ZH treatment was the best in paddy *** eff

关键词： soil amendments soda saline-alkali soil aluminum sulfate zeolite maize rice

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Characterization of Sludge Produced by Treatment of Water from the Ribaa and Bittit Karstic Springs (Meknes, Morocco)

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Journal of Water Resource and Protection 2020年第7期12卷 607-617页

作者： Nabila Basri Mohamed Farhaoui Lamyae Talbi Mustapha Derraz Hammou Ahlaf Biology Department Faculty of Sciences My Ismail University Meknes Morocco National Office of Electricity and Drinking Water Meknes Morocco Chimestry Department Faculty of Sciences My Ismail University Meknes Morocco

Problem Statement: Surface Water Treatment for potable supplies typically involves coagulation, flocculation, and processes. All water treatment plants produce sludge, during the purification of raw water, according to the level of the water turbidity. The aluminum sulfate is the most common coagulant used in water treatment plants of Morocco, as well as in many countries all over the world. It is difficult to manage sludge produced by the treatment plant. However, several studies, based on a set of jar test experiments, have demonstrated that it can be used in the process to improve the quality of the treated water and reduce the aluminum sulfate dose. Approach: In this study, the raw water treated and sludge produced in water treatment plant of Meknes, Morocco are investigated for chemical and bacteriological proprieties. The texture characterization of the dried sludge produced through the process of coagulation/flocculation and that of aluminum sulfate, used as coagulant aid, are obtained by nitrogen adsorption isotherms. Results: The physical properties of the raw water indicate its high turbidity during periods of heavy rainfall in the Bittit and Ribaa springs catchment area. However, these chemical properties indicate the quality of fresh water rich in magnesium, related to the dolomitic nature of the liastic aquifer. The bacteriological analysis of sludge produced in the treatment plant, confirms the elimination of pathogenic germs by the treatment process used. As regards the texture characterization the results demonstrated that the sludge presents some similarities with the sulfate. However, a clear difference is observed between the two solids, according to the pores distribution. Conclusions/Recommendations: Taking aluminum sulfate and sludge in comparison, it is possible to use the sludge for improving the coagulation process in water treatment.

关键词： Water Treatment Turbidity Sludge aluminum sulfate Texture Characterization N2 Isotherms

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A new generation of efficient green leaching technology for ion-adsorption rare earth

A new generation of efficient green leaching technology for ...

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中国化学会第十届全国无机化学学术会议

作者： Li Yongxiu Li hongyang Wang Dashan Wang Kang Liu Yanzhu Zhou Xuezhen Research Center for Rare Earths & Nano-micro Functional Materials Nanchang University

To overcome the serious water pollution and landslides that occur in response to in situ ion-adsorption rare earth(IARE) leaching, a new generation of efficient green leaching technology for ion-adsorption rare earth is proposed. The present presentation covers the contents including: Development history of IARE extraction technology;Classification and efficiency evaluation of IARE;Significance of high-efficiency green leaching IARE;A new generation of efficient green leaching reagents and new processes;Assessment of tailings landslide risk and leaching efficiency based on zeta potential determination;Linkage with the separation process;It was demonstrated that aluminum sulfate as a leaching agent of IARE not only has a high LE but also can reduce the amount of wastewater and risk of landslide.

关键词： Ion adsorption rare earth Leaching aluminum sulfate

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