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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 UniversityChangsha410083China Key Laboratory of Hunan Province for Metallurgy and Material Processing of Rare Metals Changsha410083China

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 H_(3)PW_(12)O_(40)-H_(2)SO_(4)-H_(3)PO_(4)mixture 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 H_(3)PO_(4)concentration inhibited spontaneous diffuse nucleation,promoted crystal growth,and avoided the formation of a dense blocking *** 98 wt.%of the scheelite concentrate was digested by H_(2)SO_(4)-H_(3)PO_(4).The selective adsorption of PW_(12)O_(40)^(3-)was realized using D301 resin,and the extraction efficiency of tungsten exceeded 99.9%.After desorption with ammonia water,PW_(12)O_(40)^(3-)was depolymerized into WO_(4)^(2-)and PO_(4)^(3-).99.9 wt.%of phosphorus was removed in the form of MgNH_(4)PO_(4)by the magnesium ammonium salt method,and the residual phosphorus concentration in the solution was lower than 10 mg·L^(-1).After purification,the highest-grade ammonium paratungstate product was prepared by evaporative crystallization.

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

Crystal Structure and Spectra Characters of 2-Benzoly-3-(4-(1,2,4-triazole)-5-anilino-thiophene and 2-(4-Methyl-benzoly)-3-(4- chlrolphenyl)-3-(1,2,4-triazole)-5-anilino-thiophene

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有机化学 2004年第Z1期24卷 25-26页

作者： CAO,Ke-Guang WANG,zhong-wei zhao,Xin-Qi School of Material Science and Engineering Beijing Institute of Technology Beijing 100081 Chengde Petroleum College Chengde 067000 School of Material Science and Engineering Beijing Institute of Technology Beijing 100081 School of Material Science and Engineering Beijing Institute of Technology Beijing 100081

　　Triazole derivatives are widely studied, because they represent the largest group of modern fungicides and are widely used both in human and veterinary therapy and in agriculture. We synthesized the title compound in which the thiophene ring was substituted by a 1,2,4-triazole group, a phenacyl group, a phenylaminol group and a benzene ring.……

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Multiple primary malignancies-hepatocellular carcinoma combined with splenic lymphoma:A case report

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World Journal of Clinical Cases 2022年第28期10卷 10130-10135页

作者： Fa-Zong Wu Xiao-Xiao Chen wei-Yue Chen Qiao-Hong Wu Jian-Ting Mao zhong-wei zhao Key Laboratory of Imaging Diagnosis and Minimally Invasive Intervention Research The Fifth Affiliated Hospital of Wenzhou Medical UniversityLishui Hospital of Zhejiang UniversityLishui 323000Zhejiang ProvinceChina

BACKGROUND Primary liver cancer is one of the most common malignant tumours,while primary splenic lymphoma is a rare ***,cases of hepatocellular carcinoma(HCC)combined with splenic lymphoma are extremely *** SUMMARY We present a 62-year-old woman who was admitted to the Interventional Radiology Department with a lump in the spleen and liver as well as multiple enlarged lymph nodes visible by ***-enhanced computed of the abdomen revealed a circular,low-density,shallow mass(approximately 2.6 cm in diameter)in the left intrahepatic lobe and multiple round,low-density shadows in the spleen with clear boundaries(maximum diameter 7.6 cm).Based on the characteristic clinical symptoms and explicit radiological findings,the clinical diagnosis was HCC with metastasis to the liver portal,retroperitoneal lymph nodes,and *** transcatheter arterial chemoembolization and sequential radiofrequency ablation,the-fetoprotein level returned to the normal range,and the hepatitis B cirrhosis *** addition,splenic tumour biopsy confirmed the diagnosis of primary malignant lymphoma,which went into remission after *** HCC with primary splenic non-Hodgkin lymphoma is extremely rare and easily *** understanding would facilitate early diagnosis,treatment and prognosis.

关键词： Multiple primary malignancies Hepatocellular carcinoma Splenomegaly Extra-hepatic primary malignancy Magnetic resonance imaging Primary non-Hodgkin’slymphoma Case report

On d-Dimensional Lattice (co)sine n-Algebra

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Communications in Theoretical Physics 2016年第10期65卷 423-430页

作者： Shao-Kui Yao Lu Ding Peng Liu Chun-Hong Zhang wei-zhong zhao School of Mathematical Sciences Capital Normal University Beijing 100048 China Institute of Applied Mathematics Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China National Center for Mathematics and Interdisciplinary Sciences Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China

We present the(co)sine n-algebra which is indexed by the d-dimensional integer *** to the associative operators,this generalized(co)sine n-algebra is the higher order Lie algebra for the n even *** particular cases are the d-dimensional lattice sine 3 and cosine 5-algebras with the special parameter *** find that the corresponding d-dimensional lattice sine 3 and cosine 5-algebras are the Nambu 3-algebra and higher order Lie algebra,*** limiting case of the d-dimensional lattice(co)sine n-algebra is also *** we construct the super sine n-algebra,which is the super higher order Lie algebra for the n even case.

关键词： infinite-dimensional algebra sine algebra Nambu 3-algebra n-algebra

Managing a One Trillion Dollar Forex Nest Egg

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Beijing Review 2006年第47期49卷 16-17页

作者： zhong wei zhao XIJUN

As China’s foreign exchange (forex) reserves exceeded $1 trillion in early November, much debate exists about the possible impacts of this ballooning wealth on China’s economy and how to properly manage it. In two separate articles carried in People’s Daily Online, zhong wei, a professor at the Financial Research Center in Beijing Normal University, and zhao Xijun, Vice President of the School of Finance of Renmin University of China, contribute their ideas.

关键词： Managing a One Trillion Dollar Forex Nest Egg

Recurrence patterns of advanced non-small cell lung cancer treated with gefitinib

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Chinese Medical Journal 2013年第12期126卷 2235-2241页

作者： CHEN Min-jiang zhong wei ZHANG Li zhao Jing LI Long-yun WANG Meng-zhao Department of Respiratory Medicine Peking Union Medical College Hospital Chinese Academy of Medical Sciences & Peking Union Medical College Beijing 100730 China

Background Gefitinib is widely used in the treatment of advanced non-small cell lung cancer （NSCLC）.However,only a small number of reports have described initial failure sites in patients treated with *** aim of this study was to investigate survival,recurrence sites,and treatment after recurrence in these *** A retrospective review was conducted of all patients with stage Ⅲ/Ⅳ NSCLC treated with gefitinib in Peking Union Medical College Hospital from October 2002 to September *** characteristics,initial failure sites,associated clinical factors,and subsequent therapy were included in the analysis of prognostic *** A total of 316 patients were identified The median progress free survival （PFS） and overall survival （OS） times were 238 days and 468 days,*** median survival time after progression was 145 *** sites of initial failure were lung （62.34%）,bone （17.72%）,central nerve system （CNS,16.14%）,liver （9.49%）,and others （7.19%）.Patients with single-site progression or multi-site progression were 81.01% and 18.99%,***-free survival time was associated with lung and bone ***,the median survival time after progression was lower in patients with multi-site progression and liver *** initial failure sites displayed no relationship with survival,including CNS *** therapy may affect survival after *** patients receiving continuous epidermal growth factor receptor tyrosine kinase inhibitor （EGFR-TKI） therapy,chemotherapy,radiotherapy,and retreatment with EGFR-TKIs,survival time after progression was prolonged compared with the best supportive *** Our data suggest that patients receiving gefltinib should be closely monitored regarding lung metastasis during *** metastases and multi-site progression were poor prognostic *** failure with gefltinib,patients may benefit from radiotherapy,chemotherapy,continuo

关键词： non-small cell lung cancer recurrence gefitinib

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

ESTERIFICATION REACTION OF ACETIC ACID WITH n-AMYL ALCOHOL OVER ZEOLITEBETA

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Journal of Energy Chemistry 1998年第4期 59-68+91页

作者： ZHANG Huai Bin\ \ ZHANG Kui\ \ YUAN zhong Yong zhao wei\ \ LI He Xuan Department of Chemistry, Nankai University Tianjin \ 300071 南开大学化学系

在连续流动反应装置上研究了β沸石分子筛上正戊醇的酯化反应。经５００℃焙烧后的β分子筛对该反应有较好的催化作用。在β分子筛上，适宜的反应温度范围是１４０～１５０℃，较高的反应温度将降低催化剂的活性与选择性。随着乙酸／正... 详细信息

在连续流动反应装置上研究了β沸石分子筛上正戊醇的酯化反应。经５００℃焙烧后的β分子筛对该反应有较好的催化作用。在β分子筛上，适宜的反应温度范围是１４０～１５０℃，较高的反应温度将降低催化剂的活性与选择性。随着乙酸／正戊醇摩尔比和ＬＨＳＶ的增加，酯的选择性增加。文中还讨论了离子交换度和焙烧温度对β分子筛表面性质和催化性能的影响。

关键词： β沸石酯化反应正戊醇乙酸

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激光透射法磁珠浓度测量系统

光学精密工程 2017年第2期25卷 297-303页

作者：钟虹陶卫赵辉高文俊上海交通大学仪器科学与工程系上海200240

磁珠广泛应用于免疫检测、细胞分离等生物实验中,磁珠浓度的检测对于评价实验效果具有重要意义。本文提出了基于激光透射法的双光路磁珠浓度测量系统,通过测量入射激光强度与透射激光强度的比值来确定磁珠浓度。利用该系统对多个浓度的... 详细信息

磁珠广泛应用于免疫检测、细胞分离等生物实验中,磁珠浓度的检测对于评价实验效果具有重要意义。本文提出了基于激光透射法的双光路磁珠浓度测量系统,通过测量入射激光强度与透射激光强度的比值来确定磁珠浓度。利用该系统对多个浓度的磁珠悬浊液进行了实验测量,每个浓度下测量多组实验数据,共采集了8 000组数据。通过拟合测量数据,建立了磁珠浓度与测量值的关系函数,二者呈现指数函数关系,拟合残差平方和为0.000 088 89,确定系数可达0.997 1,说明函数具有良好的拟合性能。实验结果表明,相对测量误差在2.5%以内,输出值相对波动范围在2.5%以内,测量系统具有较高的测量精度和良好的重复性。

关键词：光学测量激光透射法磁珠浓度双光路系统指数模型