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用钛锰合金阳极从氯化锰溶液制备纤维态电解MnO_2的研究张碧泉,童庆松,张其昕(福建师范大学化学系福州350007)采用钛锰合金电极作阳极,在90~95℃范围内,电解氯化锰溶液,制得纤维态电解γ-MnO2(简称FEMD),其MnO2含量大于90%,含... 相似文献
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钴钨电催化阴极的制备和应用 总被引:2,自引:0,他引:2
本文研究以钛和铁为基体的钴钨合金电催化阴极的制备及其在制备电解MnO2和氯碱电解工业上的应用。实验得出,钴钨镀层的结合力强、硬度大、耐腐蚀性强、耐热性优良,并且在电解300g/LNaCl和1mol/LMn-SO4+0.5mol/LH2SO4中作为阴极,具有优良的析氢电催化性能 相似文献
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本文研制了一种阳极C/RuO2+MnOx,用EDS测定了此电极的表面成份,考察了它在2.5mol/L的H2SO4电解使用寿命,测定了其极化曲线和动力学参数,结果表明,该电极优于石墨电极和铅电极。 相似文献
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制备了石墨基Co/Zn氧化物涂层氯气阳极(下称Co/Zn阳极)。适宜的Co/Zn物质的量之比为2∶1,烧结温度为300℃。X射线衍射图谱证实涂层组成为ZnCo2O4,扫描电镜确定涂层为紧密多孔的栽入结构。涂层负载为40mg·cm-2时,电极在300g·L-1、70℃NaCl电解液中,80mA·cm-2下的稳定电位为1100mV,30h内变化小于5mV。用原子吸收光谱法测得电极涂层工作时的溶解速度为Co0.43μg·cm-2·h-1,据此推算涂层的使用寿命为3.1年。测得电极对Cl-反应级数为0.6,对H+的反应级数为-0.5,提出了电极的经验速率方程,讨论了反应机理。 相似文献
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探讨了在Ti/PbO2和Ti/SnO2阳极上2-氯苯酚的电化学氧化。根据在电解过程中的电流效率和有毒中间产物的脱除率的大小,对两种电极的性能做了评价。结果表明:虽然Ti/PbO2或Ti/SnO2电极得到的平均电流效率相近,但是由于后者对有毒化合物的氧化能力强而是最佳选择。在采用Ti/SnO2电极进行电解时,当电解停止时,虽然COD值仍相对较高,但已能达到有效的处理效果(ηF≈50%),而排出液中仅 相似文献
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HTTA/TOPO混合物修饰电极预富集—石墨炉原了吸收测定镱的研究 总被引:1,自引:0,他引:1
在(CH2)6N4-HCl底液中,以HTTA/TOPO混合物为修饰剂修饰于钨丝电极,经电解预富集后用石墨炉原子吸收法进行镱的测定。应用本法可使Yb的检出限达到0.029μg/L比文献报道大为降低,并可显著改善其它稀土元素存在对测定的干扰。 相似文献
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可充碱锰电池用化学二氧化锰的制备 总被引:2,自引:0,他引:2
温度控制在85~95℃,在NHO3介质中,用KMnO4氧化MnCl2和Bi(NO3)3的混合溶液,可制得具有良好可充性能的掺铋二氧化鳃(Bi-MnO2),该样品在9mol/L KOH溶液中有稳定的循环伏安曲线且经X射线各射分析测得 在不同放电深度均无Mn3O4生成,这表明在MnO2中添加铋可阻止不具有电化学活性的MnO2生成,用该样品做成的模拟电池做连续充放电实验,电极的循环次上原来的5~6次,提 相似文献
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在一次循环工艺过程中直接浸出低品位软锰矿/大洋锰结核矿与硫化锰精矿。这不但充分利用了有限的资源,大量减少温室气体的排放和其它有害气体的环境污染,而且还将大大降低硫酸锰的生产成本,具有显著的经济效益和环境效益。其基本的反应过程如下:第一步还原浸出(酸性浸出):4MnO2+ZnS+4H2SO4→4MnSO4+ZnSO4+4H2O;第二步复分解浸出(中性浸出):MnSO4+ZnSO4+MnS→2MnSO4+ZnS↓;第三步:硫化锌循环(返回)用于新一轮(第一步)还原浸出。 相似文献
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Ayu Nakagawa Hirotoshi Nakabayashi Yoshinori Nishiwaki Shuhei Ogo Tadaharu Ueda Takuya Hasegawa 《Journal of the American Ceramic Society》2023,106(2):1149-1158
Ca14Al10Zn6O35:Mn4+ (CAZ:Mn) phosphor material, which shows deep-red luminescence, was synthesized by the coprecipitation (COP) method using a Na2CO3/NaOH solution as the precipitant. COP–CAZ:Mn phosphor exhibited a 2.1 times higher luminescence intensity than the corresponding phosphor prepared using the conventional solid-state reaction (SSR) method. This substantial increase in luminescence was mainly ascribed to the existence of a greater proportion of tetravalent manganese in COP–CAZ:Mn phosphor. Furthermore, COP–CAZ:Mn phosphor was modified with SiO2 via hydrolysis of tetraethoxysilane (TEOS) to waterproof the compound because it is easily decomposed through hydrolysis under humid conditions. The SiO2-modified CAZ:Mn phosphor maintained its crystal structure and high photoluminescence intensity after the water-resistance test. Therefore, waterproof CAZ:Mn phosphor with a high luminescence intensity was successfully discovered by utilizing the coprecipitation method and SiO2 modification. 相似文献
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催干剂异辛酸锰合成条件的研究 总被引:3,自引:0,他引:3
用异辛酸为原料,经过同氢氧化钠皂化和硫酸锰复分解反应,合成了催干剂硫酸锰。研究了皂化率、反应时间、反应温度对产率的影响。同时用正交实验的方法研究了氢氧化钠、硫酸锰的浓度及溶剂油的用量对产率的影响。实验得到了最佳工艺条件:温度95℃、反应时间90min、w(氢氧化钠):30%、w(硫酸锰)=30%、2000溶剂油50mL,转化率可以达到90%以上。 相似文献
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按照GB/T 1506-2002用硝酸铵氧化法测定锰矿中锰含量,对溶解温度和氧化温度对测定值的影响进行了研究。实验结果表明,硝酸铵氧化法中溶解温度在270℃,氧化温度在220℃至240℃时,测定值和标准值吻合,相对标准偏差小于0.10%。 相似文献
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Formation mechanism and optimized luminescence of Mn4+‐doped unequal dual‐alkaline hexafluorosilicate Li0.5Na1.5SiF6 下载免费PDF全文
Mengmeng Zhu Yuexiao Pan Xi'an Chen Hongzhou Lian Jun Lin 《Journal of the American Ceramic Society》2018,101(11):4983-4993
A novel red phosphor Li0.5Na1.5SiF6:Mn4+ (LNSF:Mn) based on the unequal dual‐alkaline hexafluorosilicate with superior optical performances has been synthesized via ion‐exchange between [MnF6]2? and [SiF6]2? at room temperature. The composition and the crystal structure of the as‐obtained phosphor LNSF:Mn were determined by energy‐dispersive x‐ray spectroscopy (EDS) and x‐ray diffraction (XRD), respectively. The formation mechanism of the red phosphor LNSF:Mn has been discussed in detail. The phosphor LNSF:Mn exhibits good chromaticity properties and a quantum yield (QY) of 96.1%, which are better than the identified fluorosilicate phosphors Na2SiF6:Mn4+ (NSF:Mn) and K2SiF6:Mn4+ (KSF:Mn). A broad and intense absorption in the blue and a bright emission in red‐shifted wavelengths make the phosphor LNSF:Mn a desired candidate for applications in warm white light‐emitting diodes. 相似文献
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Use of the Retarded Solution-Reprecipitation Process to Attain a Higher Initial Permeability in MnZn Ferrites 总被引:1,自引:0,他引:1
Miha Drofenik rej nidari Darko Makovec 《Journal of the American Ceramic Society》2003,86(9):1601-1604
We investigated the effect of various amounts of liquid phase on microstructure development during sintering and the resulting magnetic permeability of MnZn ferrite (MZF) samples. Our results revealed that the microstructure and the final magnetic permeability depend on the thickness of the liquid-phase film during sintering. The solution-reprecipitation (S-R) process, which is associated with an intensive microstructure development in MZF, starts when a continuous liquid-phase film of critical thickness δo , which wets the MZF grains, is formed. The solid-state sintering that takes place before the formation of the continuous liquid-phase film is essential for the final microstructure of MZF. 相似文献
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研究了搅拌速率,黄铁矿用量,硫酸浓度,反应温度以及锰阳极泥的颗粒半径对锰浸出率的影响。实验结果表明,当反应温度为85℃,搅拌速率为500 r/min,颗粒半径小于0.15mm,锰阳极泥、黄铁矿、硫酸的质量比为1∶0.75∶0.92时,锰的浸出率可以达到93%。 相似文献
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Binod Bihari Nayak Kulamani Parida Sreepada Bhanojee Rao 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1988,41(3):223-230
The sulphatization of low grade manganese ore with iron pyrites has been studied. The effect of reaction period, temperature, ratio of manganese to sulphur, particle size, surface area and packing density was investigated and the extent of sulphatization was reported as recovery of manganese sulphate. Under optimum heating time of 2 h at 600°C with finely powdered (?150±200 mesh BSS pyrite and ?300±325 mesh manganese ore) reactants, the conversion to manganese sulphate was 82%. 相似文献