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Efficient recovery of tungsten from scheelite concentrates using a sulfur-phosphorus mixed acid leaching system

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Tungsten 2024年第4期6卷 821-832页

作者： Jiang-Tao Li Li-Li Gao Zhong-Wei Zhao Xu-Heng Liu xing-yu chen School of Metallurgy and Environment Central South University Key Laboratory of Hunan Province for Metallurgy and Material Processing of Rare Metals

In recent years,a new process for leaching scheelite concentrates with sulfur-phosphorus mixed acid has been successfully *** process suffers from the elimination of the retarding effect of calcium sulfate,the selective extraction of tungsten from the H3PW12O40-H2SO4-H3PO4mixture solution,and the removal of introduced ***,in this paper,we investigated the inhibition measures of a calcium sulfate-blocking membrane,the selective extraction of tungsten by ion exchange,and the removal of phosphorus by the magnesium ammonium salt *** results showed that the addition of calcium sulfate whisker seeds and a higher H3PO4concentration inhibited spontaneous diffuse nucleation,promoted crystal growth,and avoided the formation of a dense blocking *** 98 wt.% of the scheelite concentrate was digested by *** selective adsorption of PW12O403-was realized using D301 resin,and the extraction efficiency of tungsten exceeded 99.9%.After desorption with ammonia water,PW12O403-was depolymerized into WO42-and PO43-.99.9 wt.% of phosphorus was removed in the form of MgNH4PO4by the magnesium ammonium salt method,and the residual phosphorus concentration in the solution was lower than 10 mg·*** purification,the highest-grade ammonium paratungstate product was prepared by evaporative crystallization.

关键词： Calcium sulfate Ion exchange Scheelite concentrates Sulfur-phosphorus mixed acid Tungsten

Short-term effects of cupping and scraping therapy for chronic nonspecific low-back pain:A prospective,multicenter randomized trial

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Journal of Integrative Medicine 2024年第1期22卷 39-45页

作者： Jun-yan He Xiao-yu Tu Zi-fei Yin Hui Mu Ming-jun Luo xing-yu chen Wei-bin Cai Xue Zhao Can Peng Fan-fu Fang Can Lü Bai Li School of Traditional Chinese Medicine Naval Medical UniversityShanghai 200433China Department of Rehabilitation Medicine and Physiotherapy the First Affiliated Hospital of Naval Medical UniversityShanghai 200433China Department of Rehabilitation Medicine and Training PLA 458 HospitalGuangzhou 510602Guangdong ProvinceChina No.3 Ward of Acupuncture Rehabilitation Department Guangdong Second Traditional Chinese Medicine HospitalGuangzhou 510095Guangdong ProvinceChina

Background As one of the most common musculoskeletal ailments,chronic nonspecific low-back pain(CNLBP)causes persistent disability and substantial medical *** evidence shows that the incidence rate of CNLBP in young and middle-aged people who are demanded rapidly recovery and social contribution is *** guidelines indicate a reduced role for medicines in the management of *** The present study investigates the short-term effects of cupping and scraping therapy using a medicated balm,compared to nonsteroidal anti-inflammatory drug(NSAID)with a capsaicin plaster,in the treatment of ***,setting,participants and interventions We designed a prospective multicenter randomized clinical trial enrolling patients from January 1,2022 to December 31,2022.A total of 156 patients with CNLBP were randomized into two parallel *** sodium-sustained release tablets were administered orally to participants in the control group for one week while a capsaicin plaster was applied *** in the test group were treated with cupping and scraping using a medical device and medicated *** outcome measures Primary outcome was pain recorded using the visual analogue scale(VAS).Two secondary outcomes were recorded using the Japanese Orthopedic Association low-back pain scale(JOA)and the traditional Chinese medicine(TCM)syndrome integral scale(TCMS)as assessment *** Between baseline and postintervention,all changes in outcome metric scales were statistically significant(P<0.001).Compared to the control group,patients in the test group had a significantly greater treatment effect in all outcome variables,as indicated by lower VAS and TCMS scores and higher JOA scores,after the one-week intervention period(P<0.001).Further,according to the findings of multivariate linear regression analysis,the participants’pain(VAS score)was related to their marital status,age,smoking habits and body mass *** adverse r

关键词： Chronic nonspecific low-back pain Traditional Chinese medicine Cupping and scraping therapy

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含钴三元硫化物常压硫酸浸出钴的动力学研究

Transactions of Nonferrous Metals Society of China 2024年第5期34卷 1669-1680页

作者：张丁川孙丰龙赵中伟刘旭恒陈星宇李江涛何利华中南大学冶金与环境学院长沙410083 中南大学稀有金属冶金与材料加工重点实验室长沙410083

开展含钴三元硫化物常压硫酸浸出的实验研究。考察搅拌速度、浸出温度、硫酸浓度和粒度对钴浸出率的影响,并分析从含钴三元硫化物中浸出钴的动力学。结果表明,在最佳条件下,钴和铁被选择性浸出,且浸出率均大于99%,而钼和铜则富集于浸出... 详细信息

开展含钴三元硫化物常压硫酸浸出的实验研究。考察搅拌速度、浸出温度、硫酸浓度和粒度对钴浸出率的影响,并分析从含钴三元硫化物中浸出钴的动力学。结果表明,在最佳条件下,钴和铁被选择性浸出,且浸出率均大于99%,而钼和铜则富集于浸出渣。通过对实验数据的分析可知,钴的浸出符合由固体产物层产生的收缩核模型,且浸出过程受内扩散控制。浸出反应的活化能为49.86k J/mol,硫酸浓度和粒度的反应级数分别为0.57和-1.4。

关键词：钴白合金含钴三元硫化物钴硫酸浸出动力学

Lighting up nonbenzenoid acepleiadylene with ultra-narrowband emission through aromaticity modulation

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Science China Chemistry 2023年第12期66卷 3506-3510页

作者： Pengcai Liu Xiao-yu Tang cheng-Zhuo Du Rui Xue xing-yu chen Jiawen Cao Xiao-Ye Wang State Key Laboratory of Elemento-Organic Chemistry Frontiers Science Center for New Organic MatterCollege of ChemistryNankai UniversityTianjin 300071China

Nonbenzenoid polycyclic arenes have attracted great attention because of their unique topological structures and appealing properties;however,they are generally considered as poor luminescent materials due to the ring puckering behavior of the ***(APD),a nonbenzenoid isomer of pyrene,has been demonstrated as an excellent building block for optoelectronic applications,but its poor photoluminescence quantum yield(PLQY)has hampered its application in luminescent *** that the ring puckering character can be suppressed by increasing the rigidity of the nonhexagon rings,herein,we propose a novel strategy for enhancing the aromaticity of the nonhexagons to improve the PLQYs of APD ***-withdrawing cyano groups are introduced on the five-membered ring of APD to enhance the chargeseparated character and thus the aromaticity of the nonhexagons,endowing the cyano-substituted APDs(CNAPD and 2CNAPD)with better ***,the cyano substitution successfully suppresses the nonradiative energy dissipation caused by the ring puckering,improving the PLQY from 2.4%for APD to 14%for CNAPD,and to 63%for *** addition,the enhanced rigidity also suppresses the vibration sideband of the photoluminescence spectra,leading to an ultra-narrowband emission from 2CNAPD with a full-width at half-maximum(FWHM)of 13 nm(47 me V),which is a new record in organic *** results demonstrate that APD derivatives have great potential in highly efficient luminescent materials with high color purity via the aromaticity regulation strategy,which provides a novel concept for designing nonbenzenoid luminescent materials.

关键词： nonbenzenoid arenes luminescence narrowband emission acepleiadylene

Nonalcoholic fatty liver disease shows significant sex dimorphism

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World Journal of Clinical Cases 2022年第5期10卷 1457-1472页

作者： xing-yu chen Cong Wang Yi-Zhou Huang Li-Li Zhang The Second Affiliated Hospital Chongqing Medical UniversityChongqing 404100China

Nonalcoholic fatty liver disease(NAFLD),which has been renamed metabolic dysfunction-associated fatty liver disease,is a growing global medical *** incidence of NAFLD and its associated end-stage liver disease is increasing each year,and many research advancements have been achieved to *** review focuses on the current knowledge of the sex differences in NAFLD and does not elaborate on areas without *** have revealed significant sex differences in the prevalence,influencing factors,pathophysiology,complications and therapies of *** have a higher incidence than *** with women,men exhibit increased visceral fat deposition,are more susceptible to leptin resistance,lack estrogen receptors,and tend to synthesize fatty acids into fat *** patients will experience more severe hepatic fibrosis and a higher incidence of liver ***,once NAFLD occurs,women show a faster progression of liver fibrosis,higher levels of liver cell damage and inflammation and are less likely to undergo liver transplantation than *** general,men have more risk factors and more severe pathophysiological reactions than women,whereas the development of NAFLD is faster in women,and the treatments for women are more limited than those for ***,whether sex differences should be considered in the individualized prevention and treatment of NAFLD in the future is worth considering.

关键词： Nonalcoholic fatty liver disease Metabolic dysfunction-associated fatty liver disease Sex differences Estrogen Steatosis Cirrhosis

同心圆式反应器中精确调控和连续制备β-四钼酸铵

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Transactions of Nonferrous Metals Society of China 2024年第1期34卷 309-321页

作者：李江涛罗勇进李志超赵中伟刘旭恒陈星宇何利华孙丰龙张宁中南大学冶金与环境学院长沙410083 中南大学稀有金属冶金与材料制备湖南省重点实验室长沙410083 中南林业科技大学理学院长沙410004

采用同心圆式反应器制备β-四钼酸铵,研究制备过程中Mo离子聚合形态和微观结构受溶液酸度影响的变化规律。结果表明,将溶液的pH值控制在2.5以下可以得到四钼酸铵晶体;采用NH_(3)·H_(2)O将溶液pH值调回至3.0有利于细粒钼酸铵结晶的溶解... 详细信息

采用同心圆式反应器制备β-四钼酸铵,研究制备过程中Mo离子聚合形态和微观结构受溶液酸度影响的变化规律。结果表明,将溶液的pH值控制在2.5以下可以得到四钼酸铵晶体;采用NH_(3)·H_(2)O将溶液pH值调回至3.0有利于细粒钼酸铵结晶的溶解,并促进七钼酸铵向四钼酸铵结晶的转变;降低(NH_(4))_(4)Mo_(4)O_(12)(O_(2))2·2H_(2)O晶体与结晶母液的接触时间有利于获得β-(NH_(4))_(2)Mo_(4)O_(13)结晶。基于钼的聚合机理,设计多个格区的同心圆反应器,实现钼酸铵结晶的分区域调控。通过调控硝酸、氨水和含晶种的母液在各格区中加入的位置和时机,可制备出优质的β-(NH_(4))_(2)Mo_(4)O_(13)结晶。

关键词： β-四钼酸铵酸化离子聚合同心圆式反应器

Removal of tungsten from molybdate solution by Fe-Mn binary oxide adsorbent

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Transactions of Nonferrous Metals Society of China 2017年第11期27卷 2492-2502页

作者： yun-feng SONG Li-hua HE xing-yu chen Zhong-wei ZHAO School of Metallurgy and Environment Central South University Changsha 410083 China Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China

Considering the different geochemical enrichment behaviors of W and Mo,Fe?Mn binary oxide(FMBO),ferric hydroxide(Fe(OH)3)and manganese dioxide(MnO2)were studied to separate W from molybdate solution,*** experimental results demonstrated that Fe?Mn binary oxide(FMBO)was the most suitable adsorbent for the *** a wide pH(6.9?11.3)region,more than80%W removal efficiency and less than3%Mo loss could be *** addition,the Fe?Mn binary oxide adsorbent can be regenerated by treating with3mol/L NaOH,and the W adsorption efficiency was retained after five adsorption?desorption?regeneration *** these indicate that the Fe?Mn binary oxides have the potential for the separation of W from molybdate solution.

关键词： tungsten removal molybdate solution Fe.Mn binary oxide adsorption

Percutaneous repair of inadvertent subclavian artery cannulation： a case report

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Chinese Medical Journal 2009年第9期122卷 1117-1118页

作者： SHI Hong-yu QIU xing-biao chen Hui LIU Zhi-gang YE Ying FANG Wei-yi Department of Cardiology Shanghai Chest Hospital Shanghai JiaoTong University Shanghai 200030 China

Although catheterization of the subclavian vein is a common procedure, it might be associated with life-threatening complications including accidental cannulation of subclavian artery. Rash sheath removal could result in fatal hemorrhage. We report a case of inadvertent 6F sheath cannulation of the right subclavian artery during a radiofrequency catheter ablation procedure and successful repair of the cannulation by Angio-Seal STS plus （St. Jude Medical, St. Paul, MN, US）, a collagen-base vascular closure device.

关键词： percutaneous repair angio-seal inadvertent subclavian artery cannulation subclavian vein catheterization

Effectiveness of drug interventions in nonalcoholic fatty liver disease:A network meta-analysis

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World Journal of Diabetes 2021年第9期12卷 1576-1586页

作者： Yi-Zhou Huang Gang-Yi Yang Cong Wang xing-yu chen Li-Li Zhang Department of Endocrinology The Second Affiliated HospitalChongqing Medical UniversityChongqing 404100China

BACKGROUND Nonalcoholic fatty liver disease(NAFLD)is a major chronic liver disorder worldwide,and there is no established treatment for this *** conducted a network meta-analysis(NMA)to compare existing treatments,which include four classes of antidiabetic drugs,and examined the optimum treatments for *** To compare the effectiveness of different treatments for *** An NMA was conducted using Stata 14.0(Corporation LLC,College Station,United States)and R(X643.6.3 version)in this *** randomized controlled trials(RCTs)were searched in the PubMed,Cochrane Library,Embase,Medline and Web of Science databases from database inception to April *** researchers independently screened the available studies in strict accordance with inclusion and exclusion *** Cochrane Risk of Bias tool was used to evaluate the risk of bias of the included *** variables with and without dimensional differences were calculated as the standardized mean difference and weighted mean difference,*** inconsistency model and“nodesplitting”technique were used to test for *** plots were used to evaluate publication *** Twenty-two eligible RCTs involving 1377 participants were eventually included in our *** were pooled using a random-effects *** NMA results revealed that glucagon-like peptide-1 receptor agonists(GLP-1RAs)were the most effective treatment,yielding improvements in hepatic fat content(HFC),alanine aminotransferase(ALT),aspartate aminotransferase(AST),serumγ-glutamyl transferase(GGT)and body weight[surface under the cumulative ranking curve(SUCRA)=99.6%,92.6%,82.8%,92.3%and 99.6%,respectively],while thiazolidinediones(TZDs)were the best intervention for reducing the NAFLD activity score(NAS;SUCRA=98.9%).In addition,moderate performance was observed for the sodium glucose cotransporter-2 inhibitors groups(SUCRA=25.1%,66.2%,63.5%,58.2%and 71.9%for HFC,ALT,AST,GGT and body weight,respecti

关键词： Antidiabetic drugs Glucagon-like peptide-1 receptor agonists Nonalcoholic fatty liver disease Network meta-analysis Thiazolidinediones