期刊文献+
共找到10篇文章
< 1 >
每页显示 20 50 100
硝酸复合溶剂酸解磷尾矿工艺条件研究 被引量:7
1
作者 张萍花 刘代俊 陈建钧 《现代化工》 CAS CSCD 北大核心 2016年第3期104-106,108,共4页
为了减少磷尾矿对环境的污染,实现磷尾矿中磷、镁、钙等资源的综合利用,采用硝酸复合溶剂浸取法对磷尾矿中磷、镁、钙回收工艺进行了研究。考察了多种因素对磷尾矿酸解过程的影响,并对工艺条件进行了优化。当液固比为4∶1,反应时间为2 h... 为了减少磷尾矿对环境的污染,实现磷尾矿中磷、镁、钙等资源的综合利用,采用硝酸复合溶剂浸取法对磷尾矿中磷、镁、钙回收工艺进行了研究。考察了多种因素对磷尾矿酸解过程的影响,并对工艺条件进行了优化。当液固比为4∶1,反应时间为2 h,硝酸质量分数为42%,反应温度为60℃,转速为400 r/min,硝酸钙质量分数为15%时,镁、钙的回收率分别为94.53%、90.07%,P_2O_5的回收率为72.92%,P_2O_5质量分数由7.12%提高到20.65%。 展开更多
关键词 磷尾矿 酸解 硝酸复合溶剂
下载PDF
硝酸胶溶剂对CuO/HZSM-5成型催化剂性能的影响 被引量:3
2
作者 徐庆生 刘久欣 +4 位作者 王亚涛 喻胜眉 李翠清 王虹 宋永吉 《工业催化》 CAS 2020年第7期29-35,共7页
催化剂CuO/HZSM-5在氧化亚氮(N2O)催化分解领域有着重要地位,完成对催化剂成型条件的探索是其工业实际应用的重要步骤。在CuO/HZSM-5成型过程中,胶溶剂的用量对成型催化剂的机械强度,催化活性以及其他物化性质有重要的影响。通过机械强... 催化剂CuO/HZSM-5在氧化亚氮(N2O)催化分解领域有着重要地位,完成对催化剂成型条件的探索是其工业实际应用的重要步骤。在CuO/HZSM-5成型过程中,胶溶剂的用量对成型催化剂的机械强度,催化活性以及其他物化性质有重要的影响。通过机械强度测定、活性评价、X射线衍射分析(XRD)、孔结构分析、氨气程序升温吸附脱附分析(NH3-TPD)、氢气程序升温还原分析(H2-TPR)等手段对催化剂性能进行分析。机械强度测定与NH3-TPD分析结果显示,胶溶剂用量对成型催化剂机械强度和酸量影响较大,胶溶剂用量为体积分数2%时,机械强度最高为135.8 N·cm^-1,而催化剂酸量在胶溶剂用量为体积分数7%时最高。XRD与孔结构分析结果显示胶溶剂用量由0增长至体积分数7%,催化剂的孔容积改变幅度较小,但比表面积由277 cm^2·g^-1增至293 cm^2·g^-1,HZSM-5的特征峰变化较小。活性评价与H2-TPR分析结果显示,胶溶剂用量为0的催化剂与添加胶溶剂后的成型催化剂,N2O完全分解的温度提高幅度最大为20℃,活性下降,且H2-TPR中还原峰提高幅度最大为27℃,可还原性变差。而胶溶剂用量由体积分数2%提高至7%,成型催化剂CuO/HZSM-5的催化活性以及可还原性差异较小。 展开更多
关键词 催化剂工程 硝酸溶剂 氧化亚氮 催化分解 成型催化剂 机械强度
下载PDF
硝酸锂在二甲亚砜溶液中离子溶剂化和离子缔合的红外光谱研究
3
作者 吴艳平 郑海金 刘向云 《广东化工》 CAS 2004年第7期23-25,共3页
利用ATR-FTIR光谱研究了硝酸锂在二甲基亚砜溶液中离子溶剂化和离子缔合,溶剂分子谱带的变化说明, 锂离子与溶剂分子之间发生了强烈的相互作用,这种相互作用主要是通过SO中的氧原子进行的,利用光谱曲线拟合技术定 量计算了阳离子溶剂化... 利用ATR-FTIR光谱研究了硝酸锂在二甲基亚砜溶液中离子溶剂化和离子缔合,溶剂分子谱带的变化说明, 锂离子与溶剂分子之间发生了强烈的相互作用,这种相互作用主要是通过SO中的氧原子进行的,利用光谱曲线拟合技术定 量计算了阳离子溶剂化数,确定溶液中离子的存在状态(直接接触离子对、自由离子)。 展开更多
关键词 硝酸 二甲亚砜 离子溶剂 离子缔合 红外光谱
下载PDF
利用超额拉曼光谱研究硝酸镁水溶液中的离子对 被引量:8
4
作者 王陈琛 林珂 +2 位作者 胡乃银 周晓国 刘世林 《物理化学学报》 SCIE CAS CSCD 北大核心 2012年第8期1823-1829,共7页
利用超额拉曼光谱研究了室温下硝酸镁(Mg(NO3)2)溶液的离子缔合情况. 测量了该溶液羟基(-OH)伸缩振动谱段和NO-3全对称伸缩振动谱段的拉曼光谱, 利用超额拉曼光谱及光谱拟合分析了这些光谱数据. -OH 伸缩振动谱段的超额拉曼光谱显示, ... 利用超额拉曼光谱研究了室温下硝酸镁(Mg(NO3)2)溶液的离子缔合情况. 测量了该溶液羟基(-OH)伸缩振动谱段和NO-3全对称伸缩振动谱段的拉曼光谱, 利用超额拉曼光谱及光谱拟合分析了这些光谱数据. -OH 伸缩振动谱段的超额拉曼光谱显示, 低浓度(<2.3 mol·kg-1)下阴离子第一水合层的水分子含量随溶液浓度的升高呈线性关系增加, 在较高浓度时(>2.3 mol·kg-1), 该含量变化偏离了线性关系, 这是因为 Mg(NO3)2溶液在高浓度时存在直接接触离子对导致的. 同样的转折点浓度也在对NO-3全对称伸缩振动谱段的分析中被观测到. 除了直接接触离子对, 还观测到三种溶剂分隔型离子对. 对该谱段下所有浓度的拉曼光谱和超额光谱进行同时拟合, 给出了不同浓度下各种离子对的相对含量, 结果显示在0.23-4.86 mol·kg-1浓度范围内都有溶剂分隔型离子对和直接接触型离子对. 当Mg(NO3)2浓度低于2.3 mol·kg-1时, 所有离子对的相对含量随浓度增加呈现直线上升, 在高于这个浓度后直接接触离子对的相对含量急剧增加, 一种溶剂分隔型离子对的相对含量增加变缓, 另一种溶剂分隔型离子对的相对含量逐渐减少, 还有一种溶剂分隔型离子对相对含量的增加趋势保持不变, 在Mg(NO3)2浓度大于3.5 mol·kg-1后, 其相对含量不再发生明显变化. 展开更多
关键词 硝酸镁水溶液:直接接触离子对:溶剂分隔离子对 超额拉曼光谱: 同时拟合
下载PDF
矿石中游离二氧化硅的快速物相分析 被引量:4
5
作者 郑大中 郑若锋 《四川化工与腐蚀控制》 2002年第3期4-10,共7页
介绍了矿石中游离二氧化硅的快速物相分析方法。以热浓磷酸 硝酸溶解硅酸盐、氧化矿物、硫化矿物、碳酸盐等 ,使游离二氧化硅与其它矿物分离 ,直接称量测定游离二氧化硅。
关键词 矿石 游离二氧化硅 快速物相分析 磷酸-硝酸混合溶剂
下载PDF
Synergistic extraction of U(VI) and Th(IV) from nitricacid media with HBMPPT and TBP in toluene
6
作者 YUShaoning BAOBorong 《Nuclear Science and Techniques》 SCIE CAS CSCD 1999年第2期125-128,共4页
The synergistic extraction of U(VI) and TI(IV) from nitric acid solution by HBMPPT (4-benzoyl-2,4-dihydrChs-methyl- andTBP (tributylphosphate ) in toluene was studied. The extraction ability of HBMPPTfor U(VI) and TI(... The synergistic extraction of U(VI) and TI(IV) from nitric acid solution by HBMPPT (4-benzoyl-2,4-dihydrChs-methyl- andTBP (tributylphosphate ) in toluene was studied. The extraction ability of HBMPPTfor U(VI) and TI(IV) was not so high, but when a little TBP was added in, theability to extract U(VI) and TI(IV) was improved. The extracted complexes maybe presented as UOZNO3.BMPPT.TBP and UOZ(BMPPT)2.TBP for U(VI), andTI(NOs)s.BMPPT.TBp and TI(NOs)z (BMPPT)z.TBP for TI(IV), respectively, inthe. synergistic extraction system. The synergistic effect of HBMPPT and TBP makesthe separation coefficient of U(VI) /TI(IV) or U(VI)/Eu(lll) reach a high value. 展开更多
关键词 叠加提取 硝酸溶剂
下载PDF
Solvent extraction of nitric acid, uranium(VI) and thorium(IV) by N,N,N',N'-tetrahexylsuccinylamide
7
作者 TAN Xufang WANG Youshao +1 位作者 TAN Taizhe (Laiyang Agricultural College, Laiyang 265200) YANG Yanzhao BAO Borong (Shanghai Institute of Nuclear Research, the Chinese Academy of Sciences, Shanghai 201800) SUN Sixiu (Department of Chemistry, Shandong University, 《Nuclear Science and Techniques》 SCIE CAS CSCD 1999年第1期19-23,共5页
A new kind of diamide N,N,N’,N’-tetrahexylsuccinylamide(THSA) was synthesized, characterized and used for the extraction of HNO3, U(VI) and TI(IV) in a diluent composed of 0.5 volume fraction 1,2,4-trimethy be... A new kind of diamide N,N,N’,N’-tetrahexylsuccinylamide(THSA) was synthesized, characterized and used for the extraction of HNO3, U(VI) and TI(IV) in a diluent composed of 0.5 volume fraction 1,2,4-trimethy benzene(TMB) and 0.5 volume fraction kerosene(OK). Extraction distribution coefficients of U(VI) and TI(IV) as functions of aque- ous nitric acid concentration, extractant concentration, temperature and salting-out agent (LiNO3 ) have been studied, and it is found that THSA as an extractant is superior to TBP for extraction of U(VI) and TI(IV). Back extraction was also studied. At low acidity, the main adduct of THSA and HNO3 is HNO3.THSA. THSA.(HNO3)2 and THSA.(HNO3)3 are also found at high acidity. The compositions of extracted species, apparent equilibrium constants and enthalpies of extraction reactions have also been calculated. 展开更多
关键词 硝酸溶剂提取
下载PDF
Coordination leaching of tungsten from scheelite concentrate with phosphorus in nitric acid 被引量:4
8
作者 张文娟 杨金洪 +2 位作者 赵中伟 王文强 李江涛 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第6期1312-1317,共6页
A hydrometallurgical process for tungsten extraction and recovery from scheelite is reported.The technology includes leaching scheelite using phosphoric acid as chelating agent in nitric acid solutions,extracting tung... A hydrometallurgical process for tungsten extraction and recovery from scheelite is reported.The technology includes leaching scheelite using phosphoric acid as chelating agent in nitric acid solutions,extracting tungsten by solvent extraction and reusing leaching agent.In the leaching process,affecting factors,such as temperature,leaching time,nitric acid and dosage of phosphoric acid,were examined on recovery of tungsten.Results show that more than 97%of tungsten could be extracted under conditions of leaching temperature of 80-90°C,HNO3 concentration of 3.0-4.0 mol/L,liquild-to-soild ratio of 10:1,H3PO4 dosage of 3 stoichiometric ratio and leaching time of 3 h.Solvent extraction was then employed for the W recovery from the leachate with a organic system of 40%(v/v)N235,30%(v/v)TBP,and 30%sulfonated kerosene.Approximately 99.93%of W was extracted and ammonium tungstate solution containing 193 g/L W was obtained with a stripping rate of 98.10%under the optimized conditions. 展开更多
关键词 SCHEELITE nitric acid phosphoric acid coordination leaching
下载PDF
Measurement and Correlation of Solubility of Ethyl Nitrite in Mixed Solvent
9
作者 庞建媛 刘国维 +1 位作者 马沛生 方越 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2000年第3期251-254,共4页
An experimental apparatus was used to measure the solubility of ethyl nitrite in mixed solvents under the lower pressure and higher temperature. The solubilities of ethyl nitrite in mixed solvents of ethanol-water at... An experimental apparatus was used to measure the solubility of ethyl nitrite in mixed solvents under the lower pressure and higher temperature. The solubilities of ethyl nitrite in mixed solvents of ethanol-water at 15℃-40℃ and ethanol-diethyl oxalate at 20℃--40℃ were determined. A Henry constant model has been improved, and the interaction parameters have been fitted from experimental data. The calculation results have been compared with experimental data; the results obtained are satisfactory. 展开更多
关键词 SOLUBILITY ethyl nitrite mixed solvents Henry constant
下载PDF
Properties and evaluation of amidoxime-based UHMWPE fibrous adsorbent for extraction of uranium from seawater 被引量:17
10
作者 XING Zhe HU JiangTao +4 位作者 WANG MouHua ZHANG WenLi LI ShiNeng GAO QianHong WU GuoZhong 《Science China Chemistry》 SCIE EI CAS 2013年第11期1504-1509,共6页
An amidoxime-based ultra-high molecular weight polyethylene (UHMWPE) fibrous adsorbent was successfully prepared by T-irradiation-induced graft copolymerization of acrylonitrile (AN) and acrylic acid (AA), follo... An amidoxime-based ultra-high molecular weight polyethylene (UHMWPE) fibrous adsorbent was successfully prepared by T-irradiation-induced graft copolymerization of acrylonitrile (AN) and acrylic acid (AA), followed by amidoximation. The grafting of AN and AA on the UHMWPE fiber and the amidoximation of the grafted fiber were confirmed by Fourier transform infrared spectroscopy, scanning electron microscopy, and thermogravimetric analysis. The mechanical property of the original and modified UHMWPE fibers was compared by single-filament strength test. The adsorption property of the UHMWPE fibrous adsorbent was evaluated by adsorption test in uranyl nitrate solution and seawater. The surface of the modified UHMWPE fibers was covered by the grafting layer and became rough. The tensile strength of the amidoxime-based UHMWPE fibrous adsorbent was influenced by the absorbed dose and hydrochloric acid elution, but was independent of the grafting yield and amidoximation. The uranium adsorption amount of the amidoxime-based UHMWPE fibrous adsorbent after immersing in seawater for 42 days was 2.3 mg-U/g. 展开更多
关键词 ultra-high molecular weight polyethylene fiber ACRYLONITRILE acrylic acid radiation graft copolymerization amidoxi-mation uranium extraction
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部