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膜分离技术在矿井废水回用中的应用 总被引:2,自引:0,他引:2
针对大同某煤矿用水困难,矿井废水铁锰含量高,采用微孔曝气、锰砂过滤、超滤、反渗透相结合的处理丁艺解决矿区工业生产和居民生活用水。从而推动了膜分离技术在中水回用方面的应用。 相似文献
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为研究不同滤层下处理复合型微污染地下水的效果,采用锰砂-陶粒-锰砂为滤料的三级曝气-生物接触氧化法,研究了全跌水曝气方式和全机械曝气方式的滤速分别为2、3、4、5、6 m/h时,滤层沿程出水水质情况。结果为全机械曝气滤柱在各滤速下,出水铁(Fe)、锰(Mn)、氨氮和高锰酸盐4项指数均能达标。全跌水曝气滤速为2 m/h时,出水4项指标均能达标;滤速为3、4 m/h时,仅出水Fe达标,Mn和氨氮不能达标。表明水中Fe在经过1500 mm滤层以后均能达标,增加曝气装置,不仅能够提升水中Mn、氨氮和有机物的去除空间,还能提高水中Mn、氨氮和有机物的去除率。 相似文献
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采用石英砂/锰砂混层滤料去除电厂循环冷却水中的铁,探讨了pH值对混层滤料除铁的影响。结果表明,石英砂/锰砂比例为3∶7的混层滤料,pH值在6.5~8.5,滤速为1.5 m/h的条件下,除铁效果最好,滤后水中的总铁和亚铁含量均在11μg/L以下,达到使用要求,效果满意。该方法为电厂循环冷却水处理提供了基础实验依据,为其他工农业给水有效去除铁(Ш)的色度污染提供了参考。 相似文献
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采用升流式曝气生物滤池(UBAF)去除源水中高含量的锰,研究生物滤池滤速和气水比对UBAF去除锰的效果的影响,同时确定最佳的反冲洗方式。结果表明,随着生物滤池滤速的降低,UBAF工艺对锰的去除效率增高,滤速是该工艺除锰效果的决定性因素。生物滤池气水比越大除锰效果越好,但随着气水比的不断增大去除效果增长缓慢,考虑保证去除效率和曝气能适中,适宜的气水体积比为0.3。定期反冲洗对维持UBAF工艺的除锰效果有重要作用,该工艺适合的反冲洗周期为4~5 d,反冲洗方式为先气冲3 min,气冲洗强度为20 L/(m2·s),再气水联合冲15min,气、水冲洗强度分别为20、8 L/(m2·s),共18 min。 相似文献
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介绍了煤矿污水处理与回用工艺具体的过程,分析了回用工艺的主要优势,包括成熟可靠的工艺;有较高的污水负荷率和耐冲击负荷,不限制进水要求;锰砂过滤器的增加,可以使污水中的锰、铁等金属离子能得到更有效的处理等诸多优势,同时消防用水及煤炭喷淋时均可以使用处理过后的水,希望对今后的煤矿污水处理与回用提供参考建议。 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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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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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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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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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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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
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用钛白副产的硫酸亚铁浸锰制备高纯二氧化锰 总被引:5,自引:0,他引:5
以低品位的贫软锰矿为原料,对用生产钛白副产的硫酸亚铁直接浸锰、浸出液除杂、碳酸锰沉淀、碳酸锰焙烧及二氧化锰精制制备二氧化锰的工艺条件进行了研究。实验得到硫酸亚铁浸锰的最佳工艺条件为:浸锰温度70℃,浸锰时间3h,硫酸初始浓度2.1mol/L,矿粉粒度〈150μm,硫酸亚铁加入量为其理论量的120%,固液质量比1:3。碳酸锰焙烧的适宜条件为:焙烧时间4~5h,焙烧温度320—340℃,焙烧料翻动时间10-15min。按该条件浸锰并制备高纯二氧化锰,锰的浸出率可达98.5%以上,产品质量符合ZBG13001-1986一级品标准。该工艺为贫软锰矿的开发利用及钛白粉厂的硫酸亚铁渣的综合利用开辟了一条新途径。 相似文献