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Efficient desorption and reuse of collector from the flotation concentrate:A case study of scheelite

International Journal of Minerals,Metallurgy and Materials 2024年第11期31卷 2435-2444页

作者： Liming Tao Jianjun Wang Dejin Liao Wenkai Jia Zihan Zhao Wenfang Che Zhongxu Qi Wei Sun Zhiyong Gao School of Minerals Processing and Bioengineering Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral ResourcesEngineering Research Center of Ministry of Education for Carbon Emission Reduction in Metal Resource Exploitation and UtilizationCentral South UniversityChangsha 410083China State Key Laboratory of Mineral Processing BGRIMM Technology GroupBeijing 102628China Mining Technology Research Center China Tungsten and Hightech Materials Co.Ltd.Chenzhou 423000China Luoyang Luanchuan molybdenum group Co. Ltd.Luoyang 471500China Changsha Institute of Mining Research Co. Ltd.Changsha 410012China

Flotation is the most common method to obtain concentrate through the selective adsorption of collectors on target minerals to make them hydrophobic and *** the hydrometallurgy of concentrate,collectors adsorbed on concentrate can damage ion-exchange resin and increase the chemical oxygen demand(COD)value of *** this work,we proposed a new scheme,i.e.,desorbing the collectors from concentrate in ore dressing plant and reusing them in flotation *** nitrate and benzohydroxamic acid(Pb-BHA)complex is a common collector in scheelite *** this study,different physical(stirring or ultrasonic waves)and chemical(strong acid or alkali environment)methods for facilitating the desorption of Pb-BHA collector from scheelite concentrate were ***-mineral desorption tests showed that under the condition of pulp pH 13 and ultrasonic treatment for 15 min,the highest desorption rates of Pb and BHA from the scheelite concentrate were 90.48%and 63.75%,***-of-mine ore flotation tests revealed that the reuse of desorbed Pb and BHA reduced the collector dosage by 30%for BHA and 25%for *** strong alkali environment broke the chemical bonds between Pb and *** cavitation effect of ultrasonic waves effectively reduced the interaction intensity between Pb-BHA collector and scheelite *** method combining ultrasonic waves and strong alkali environment can effectively desorb the collectors from concentrate and provide“clean”scheelite concentrate for metallurgic plants;the reuse of desorbed collector in flotation flowsheet can reduce reagent cost for ore dressing plants.

关键词： scheelite concentrate collector desorption reuse flotation

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无机磷酸盐抑制剂在含钙矿物浮选分离中的新见解

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Journal of Central South University 2024年第3期31卷 796-812页

作者：关智文焦芬王旭覃文庆符力文张政权李卫 School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic calcium-containing Mineral Resources Central South UniversityChangsha 410083China

本文通过计算预测了焦磷酸四钠(TSPP)、三聚磷酸钠(STPP)和六偏磷酸钠(SHMP)对白钨矿、萤石和方解石的抑制能力,并通过微浮选试验进行了验证。亲水-亲脂性平衡(HLB)计算、基团电负性计算和微浮选试验结果表明,磷酸盐对三种矿物的抑制能... 详细信息

本文通过计算预测了焦磷酸四钠(TSPP)、三聚磷酸钠(STPP)和六偏磷酸钠(SHMP)对白钨矿、萤石和方解石的抑制能力,并通过微浮选试验进行了验证。亲水-亲脂性平衡(HLB)计算、基团电负性计算和微浮选试验结果表明,磷酸盐对三种矿物的抑制能力随着磷酸基团数量的增加而增强,三种无机磷酸盐的抑制能力顺序为SHMP>STPP>TSPP。STPP在萤石和方解石中浮选分离白钨矿具有很大的潜力。STPP对三种含钙矿物的抑制能力依次为方解石>萤石>白钨矿。接触角测量、吸附量测量、X射线光电子能谱(XPS)分析和原子力显微镜(AFM)成像结果表明,STPP在萤石和方解石表面的吸附量远大于在白钨矿表面的吸附。白钨矿对STPP的弱吸附几乎不影响油酸钠(NaOL)的捕收。STPP可与萤石和方解石表面的Ca^(2+)络合,阻碍后续NaOL的吸附。本研究结果对白钨矿的浮选和含钙脉石矿物抑制剂的筛选具有指导意义。

关键词：白钨矿萤石方解石无机磷酸盐浮选分离

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A novel surfactant N-hydroxy-9,10-epoxy group-octadecanamide:Part *** synthesis and application in flotation separation of spodumene and albite

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Transactions of Nonferrous Metals Society of China 2024年第9期34卷 3002-3015页

作者： Wei-di ZHANG Meng-jie TIAN Wei SUN School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China State Key Laboratory of Mineral Processing Beijing 102600China Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources Wuhan 430081China Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic calcium-containing Mineral Resources Central South UniversityChangsha 410083China

A novel hydroxamic acid,N-hydroxy-9,10-epoxy group-octadecanamide(N-OH-9,10-O-ODA),was synthesised by modifying the structure of oleic *** carboxyl group of oleic acid was converted into an N-hydroxy amide group,and an epoxy group was introduced into its structure.N-OH-9,10-O-ODA was used as a novel collector in the flotation separation of spodumene from one of its associated gangue minerals,specifically albite.N-OH-9,10-O-ODA exhibits remarkable selectivity,with a stronger affinity for collecting spodumene particles compared to albite *** potential measurements and X-ray photoelectron spectroscopic analysis reveal that the adsorption quantity of N-OH-9,10-O-ODA on spodumene surface is comparable to that on albite ***-principles calculations demonstrate the diverse adsorption configurations of N-OH-9,10-O-ODA on surfaces of spodumene and albite,leading to its distinct collecting abilities for spodumene and albite particles.

关键词： N-hydroxy-9,10-epoxy group-octadecanamide spodumene albite flotation separation oleic acid

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Structure-activity relationship of cyclic ADP-ribose, an update

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Journal of Chinese Pharmaceutical Sciences 2013年第2期22卷 127-136页

作者： Andreas H. Guse the calcium signalling group Department of Biochemistry and Signal Transduction and Department of Biochemistry and Molecular Cell Biology University Medical Center Hamburg-Eppendorf

Cyclic ADP-ribose (cADPR) is a universal Ca2+ mobilizing second messenger in many different cell types and organisms. cADPR activates Ca2+ release from endo/sarcoplasmic reticulum via ryanodine receptors. In addition, Ca2+ entry secondary to Ca2+ depletion is at least one of the mechanisms in which cADPR triggers Ca2+ inflow, too. Analogues of cADPR have been prepared by chemical and chemo-enzymatic routes. Most of the analogues were analyzed for biological activity in intact or permeabilized Jurkat T cells (a human T-lymphoma cell line). As a systematic approach, analogues were grouped according to alterations in the base, the northern ribose, the southern ribose, the pyrophosphate backbone, or in complex modifications, comprising more than one part of the molecule. Biological activity of the analogues is reviewed, with special emphasis on Jurkat T cells.

关键词： Cyclic ADP-ribose calcium signaling Cyclic ADP-ribose analogue Ryanodine receptor TRPM2 Cellular signal transduction

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A dysregulated calcium homeostasis as the earliest pathological sign in stem cell-derived Parkinson's disease neurons?

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Neural Regeneration Research 2024年第7期19卷 1421-1422页

作者： Nilima Prakash Working group Human Stem Cell Research Department Hamm 2Hamm-Lippstadt University of Applied SciencesHammGermany

Parkinson’s disease(PD) is characterized by the slow and progressive demise of dopamine(DA)-synthesizing neurons in the substantia nigra pars compacta(SNc),a nucleus located in the human ventral *** death also affects other regions in the brain at later stages of *** concomitant lack of DA in the human forebrain(striatum) leads to the typical motor symptoms of this still uncurable neurodegenerative disorder.

关键词： homeostasis dopamine death

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Hydration Behavior and Cementitious Properties of calcium Carbonate-aluminate Minerals Composite

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Journal of Wuhan University of Technology(Materials Science) 2024年第1期39卷 126-133页

作者：王冲周帅 ZOU Luyao LIU Jiawen ZHENG Yalin College of Materials Science and Engineering Chongqing UniversityChongqing 400045China China West Construction group Co. Ltd.Chengdu 610015China

The purpose of this research is to investigate the hydration behavior and cementitious properties of the mixture of calcium carbonate and aluminate, and to explore whether it can be adopted as a new low-carbon cementitious material. The composite system of calcium carbonate and aluminate minerals is studied by measuring the component of hydration products, the hydration heat, setting time and compressive *** results prove that the composite system has certain cementitious properties and is feasible to prepare new low-carbon cement.

关键词： limestone hydrated calcium carboaluminate cementitious properties mechanical properties

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Research progress of CO_(2) capture and mineralization based on natural minerals

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International Journal of Minerals,Metallurgy and Materials 2024年第6期31卷 1208-1227页

作者： Chenguang Qian Chunquan Li Peng Huang Jialin Liang Xin Zhang Jifa Wang Jianbing Wang Zhiming Sun School of Chemical and Environmental Engineering China University of Mining and Technology(Beijing)Beijing 100083China Shanghai Construction Building Material Technology group Shanghai 200080China

Natural minerals,such as kaolinite,halloysite,montmorillonite,attapulgite,bentonite,sepiolite,forsterite,and wollastonite,have considerable potential for use in CO_(2) capture and mineralization due to their abundant reserves,low cost,excellent mechanical prop-erties,and chemical *** the past decades,various methods,such as those involving heat,acid,alkali,organic amine,amino sil-ane,and ionic liquid,have been employed to enhance the CO_(2) capture performance of natural minerals to attain high specific surface area,a large number of pore structures,and rich active *** research on CO_(2) capture by natural minerals will focus on the full utiliza-tion of the properties of natural minerals,adoption of suitable modification methods,and preparation of composite materials with high specific surface area and rich active *** addition,we provide a summary of the principle and technical route of direct and indirect mineralization of CO_(2) by natural *** process uses minerals with high calcium and magnesium contents,such as forsterite(Mg_(2)SiO_(4)),serpentine[Mg_(3)Si_(2)O(OH)_(4)],and wollastonite(CaSiO_(3)).The research status of indirect mineralization of CO_(2) using hydro-chloric acid,acetic acid,molten salt,and ammonium salt as media is also introduced in *** recovery of additives and high-value-added products during the mineralization process to increase economic benefits is another focus of future research on CO_(2) mineralization by natural minerals.

关键词： natural mineral carbon dioxide capture modification composite material carbon dioxide mineralization

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Diffusion and reaction mechanism of limestone and quartz in fluxed iron ore pellet roasting process

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International Journal of Minerals,Metallurgy and Materials 2024年第3期31卷 485-497页

作者： Yufeng Guo Jinlai Zhang Shuai Wang Jianjun Fan Haokun Li Feng Chen Kuo Liu Lingzhi Yang School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China Technology Center Taiyuan Iron Steel(Group)Co.Ltd.(TISCO)Taiyuan 030003China

The increase to the proportion of fluxed pellets in the blast furnace burden is a useful way to reduce the carbon emissions in the ironmaking *** this study,the interaction between calcium carbonate and iron ore powder and the mineralization mechanism of fluxed iron ore pellet in the roasting process were investigated through diffusion couple *** electron microscopy with energy dispersive spectroscopy was used to study the elements’diffusion and phase transformation during the roasting *** results indicated that limestone decomposed into calcium oxide,and magnetite was oxidized to hematite at the early stage of *** the increase in roasting temperature,the diffusion rate of Fe and Ca was obviously accelerated,while the diffusion rate of Si was relatively *** order of magnitude of interdiffusion coefficient of Fe_(2)O_(3)-CaO diffusion couple was 10^(−10) m^(2)·s^(−1) at a roasting temperature of 1200℃for 9 ***_(2)Fe_(2)O_(5) was the initial product in the Fe_(2)O_(3)-CaO-SiO_(2) diffusion interface,and then Ca_(2)Fe_(2)O_(5) continued to react with Fe_(2)O_(3) to form CaFe_(2)O_(4).With the expansion of the diffusion region,the sillico-ferrite of calcium liquid phase was produced due to the melting of SiO_(2) into CaFe_(2)O_(4),which can strengthen the consolidation of fluxed ***,andradite would be formed around a small part of quartz particles,which is also conducive to the consolidation of fluxed *** addition,the principle diagram of limestone and quartz diffusion reaction in the process of fluxed pellet roasting was discussed.

关键词： fluxed iron ore pellet limestone hematite quartz diffusion reaction

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Clinical pharmaceutical analysis of combined therapy with amlodipine benzenesulfonate and atorvastatin calcium for elderly patients with hypertension and dyslipidemia

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South China Journal of Cardiology 2024年第1期25卷 38-43页

作者：陈立新 Outpatient Western Pharmacy at Yanshou Hospital tumor hospitalthe affiliated Hospital(Group)of Putian University Medical GroupPutian city 351100Fujian provinceChina

Background Hypertension combined with dyslipidemia is the main cause of cerebrovascular and cardiovascular accidents in elderly patients,and actively controlling blood pressure and lipid levels is the best way to reduce the risk of cardiovascular accidents and *** study focused on the clinical pharmaceutical analysis of combined therapy with amlodipine benzenesulfonate and atorvastatin calcium for elderly patients with hypertension and *** A total of 292 elderly patients with hypertension and dyslipidemia from August 2022 to February 2023 were selected and grouped according to random number table method,and evenly assigned to control group(n=146)and observation group(n=146).Control group was treated with amlodipine besylate,and observation group was treated with combined therapy with amlodipine benzenesulfonate and atorvastatin *** effects and adverse reactions of the two groups were compared,and the changes of blood pressure and lipid indexes before and after treatment were also *** The total effective rate of observation group was higher than that of control group,the difference was significant(Pgroups(P>0.05).No significant differences were found in systolic blood pressure,diastolic blood pressure,total cholesterol and triglyceride between the two groups before treatment(P>0.05).While after treatment,the level of systolic blood pressure,diastolic blood pressure,total cholesterol and triglyceride in the observation group were lower than those in the control group(Pcalcium is effective and safe,improving blood pressure and lipid levels in patients with hypertension and dyslipidemia,and can be widely applied to elderly patients with hypertension and dyslipidemia.[S Chin J Cardiol 2024;25(1):38-43].

关键词： Amlodipine benzenesulfonate Atorvastatin calcium Hypertension combined with dyslipidemia

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Effect of drying-wetting cycles on pore characteristics and mechanical properties of enzyme-induced carbonate precipitation-reinforced sea sand

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第1期16卷 291-302页

作者： Ming Huang Kai Xu Zijian Liu Chaoshui Xu Mingjuan Cui College of Civil Engineering Fuzhou UniversityFuzhou350108China Xiamen Rail Transit Construction and Development group Co. Ltd.Xiamen361000China School of Civil Environment and Mining EngineeringThe University of AdelaideAdelaide5005Australia

Enzyme-induced carbonate precipitation(EICP)is an emanating,eco-friendly and potentially sound technique that has presented promise in various geotechnical ***,the durability and microscopic characteristics of EICP-treated specimens against the impact of drying-wetting(D-W)cycles is under-explored *** study investigates the evolution of mechanical behavior and pore charac-teristics of EICP-treated sea sand subjected to D-W *** uniaxial compressive strength(UCS)tests,synchrotron radiation micro-computed tomography(micro-CT),and three-dimensional(3D)recon-struction of CT images were performed to study the multiscale evolution characteristics of EICP-reinforced sea sand under the effect of D-W *** potential correlations between microstructure characteristics and macro-mechanical property deterioration were investigated using gray relational analysis(GRA).Results showed that the UCS of EICP-treated specimens decreases by 63.7% after 15 D-W *** proportion of mesopores gradually decreases whereas the proportion of macropores in-creases due to the exfoliated calcium carbonate with increasing number of D-W *** micro-structure in EICP-reinforced sea sand was gradually disintegrated,resulting in increasing pore size and development of pore shape from ellipsoidal to columnar and *** gray relational degree suggested that the weight loss rate and UCS deterioration were attributed to the development of branched pores with a size of 100-1000 m m under the action of D-W ***,the results in this study provide a useful guidancee for the long-term stability and evolution characteristics of EICP-reinforced sea sand under D-W weathering conditions.

关键词： Enzyme-induced carbonate precipitation(EICP) Plant-based urease Drying-wetting(D-W)cycles Microstructure

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