共查询到20条相似文献,搜索用时 31 毫秒
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从浸提、干扰去除和显色3个方面对纳氏试剂分光光度法进行优化改进,建立了一种用于粉煤灰中氨氮测定的适宜方法,并利用浸提完全度和精密度实验对该方法了进行了评价。优化后的方法为:按固液比1∶10加入0.05 mol/L H_2SO_4振荡浸提30 min,再加入1.5 mL酒石酸钾钠溶液(500 g/L)和1.5 mL NaOH溶液(5 mol/L)去除金属离子干扰,最后加入1.5 mL纳氏试剂进行显色。粉煤灰浸提后残渣的蒸馏液中未检测出氨氮,说明浸提效果较为完全。同一样品的8次平行测定结果的相对标准偏差为6.10%,说明该方法稳定可靠。 相似文献
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铅蓄电池生产企业的清洁生产审核 总被引:3,自引:0,他引:3
介绍了某铅蓄电池生产企业按照清洁生产审核程序的7个阶段开展的清洁生产审核工作,分别对企业含铅废气、含铅废水和含铅危险废物污染源进行了排查,采用铅平衡核算、与清洁生产标准进行指标对比等方法查找问题并进行原因分析,提出改进方案。实施清洁生产方案后企业废水产生量为0.10 m3/(kV.A.h)(以生产单位电功率铅蓄电池产生的废水量计),总铅产生量为0.35 g/(kV.A.h),铅尘处理系统除尘效率达98%以上,年减少含铅废酸液产生量50 t,年减排铅尘3.2 kg,年节约成本50万元以上。 相似文献
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欧阳培 《再生资源与循环经济》2004,(5)
粉煤灰是燃煤电厂从烧煤粉锅炉烟气中收集的微细粉粒.由于它是一种具有火山灰活性的粒状材料,可以开发与利用.在对粉煤灰特征及其危害分析的基础上,提出了综合利用粉煤灰的战略思路,介绍了粉煤灰在混凝土建材制品中、在吸附烟气中低浓度SO2和废水处理等方面的综合利用情况. 相似文献
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粉煤灰在建筑砂浆中的水化机理和粉煤灰效应:粉煤灰建筑砂浆的基础研究之 总被引:2,自引:0,他引:2
详细探讨了粉煤灰的形态效应、活性效应格微集料效应及在建筑砂浆中的水化反应机理。粉煤灰所含玻璃微珠与砂浆体中游离Ca(OH)2的火山灰反应是产生相应力学强度的主要原因,其品质(细度与含碳量)及掺量对不同类型、不同标号砂浆的强度的明显影响。 相似文献
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详细探讨了粉煤灰的形态效应、活性效应和微集料效应及在建筑砂浆中的水化反应机理。粉煤灰所含玻璃微珠与砂浆体中游离Ca(OH) 2 的火山灰反应是产生相应力学强度的主要原因 ,其品质 (细度和含碳量 )及掺量对不同类型、不同标号砂浆的强度有明显影响。 相似文献
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粉煤灰是电力行业排放的主要固体废弃物,对其的资源化利用已成为环保的首要任务。对粉煤灰进行高附加值的资源化回收利用,是实现可持续发展的必经之路。介绍了大唐国际成功开发研制的从高铝粉煤灰中提取氧化铝技术,开辟了粉煤灰综合利用的新途径。 相似文献
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清洁生产是依靠科技进步,改进技术而得到的清洁生产过程,通过清洁生产可以获得清洁的产品.讨论了在中国现阶段实施清洁生产的必要性;分析了清洁生产在中国实施的意义. 相似文献
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Kumar E. Muthu Perumal Priyadharshini Ramamurthy K. 《Journal of Material Cycles and Waste Management》2022,24(4):1378-1395
Journal of Material Cycles and Waste Management - This paper reports the influence of the addition of slag in a fly ash-based alkali-activated aerated system, using both Class-F and Class-C fly... 相似文献
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改性粉煤灰处理含油废水的应用研究 总被引:11,自引:0,他引:11
在阐述含油废话水的危害及粉煤灰物化性能的基础上,介绍了粉煤灰处理废水的机理及改性方法。用改性粉煤灰处理高、低浓度含油废水,使之达到排放标准,均可获得满意的效果。 相似文献
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Ling Wang He Sun Zhihui Sun Enqing Ma 《Journal of Material Cycles and Waste Management》2016,18(4):763-770
China has ranked first in the coal fly ash emission in the world. The multipurpose use of the fly ash from power plant waste is always an important topic for the Chinese environmental protection, which has drawn the concern of the government, scientific research departments, manufacturing enterprises and industry experts. This paper introduces an experimental research on how to recycle fly ash effectively, a kind of new technology of making bricks by which fly ash content could be amounted to 50–80 %. The article introduces raw materials of fly ash brick, production process and key control points. It introduces how to change the technical parameters of the existing brick-making mechanical device, optimize the parameters combination and improve the device performance. High-content fly ash bricks are manufactured, which selects wet fly ash from power plants, adding aggregate with reasonable ratio and additives with reasonable dosage, and do the experimental research on manufactured products for properties, production technology and selection about technology parameters of production equipment. All indexes of strength grade, freezing-thawing resisting, and other standards of the studied bricks reached the national standards for building materials industry. 相似文献
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通过试验研究再生骨料混凝土中粉煤灰和再生骨料对混凝土强度的影响。采用粉煤灰替代部分水泥、再生骨料替代部分天然粗骨料的方法,通过正交试验测定混凝土立方体抗压强度的方法,来研究粉煤灰对再生骨料混凝土强度的影响。试验得出:当再生骨料掺量为20%~30%时,粉煤灰的最佳掺量为20%左右;当再生骨料掺量高于40%、粉煤灰掺量高于20%时,其混凝土拌合物搅拌时间不小于240 s,且当粉煤灰在20%~30%时,可获得较理想的混凝土抗压强度;当粉煤灰的掺入量分布在20%~30%、再生骨料的最佳掺量为50%时,可获得较理想的混凝土抗压强度。由此得出,合理的再生骨料、粉煤灰掺量对混凝土的抗压强度影响并不明显且有提高的趋势,对降低混凝土成本,提高建筑垃圾的再生利用,有一定的经济效益和社会效益。 相似文献
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Chindaprasirt P Jaturapitakkul C Chalee W Rattanasak U 《Waste management (New York, N.Y.)》2009,29(2):539-543
This research was conducted to compare geopolymers made from fly ash and ground bottom ash. Sodium hydroxide (NaOH) and sodium silicate (Na(2)SiO(3)) solutions were used as activators. A mass ratio of 1.5 Na(2)SiO(3)/NaOH and three concentrations of NaOH (5, 10, and 15M) were used; the geopolymers were cured at 65 degrees C for 48 h. A Fourier transform infrared spectrometer (FT-IR), differential scanning calorimeter (DSC), and scanning electron microscope (SEM) were used on the geopolymer pastes. Geopolymer mortars were also prepared in order to investigate compressive strength. The results show that both fly ash and bottom ash can be utilized as source materials for the production of geopolymers. The properties of the geopolymers are dependent on source materials and the NaOH concentration. Fly ash is more reactive and produces a higher degree of geopolymerization in comparison with bottom ash. The moderate NaOH concentration of 10 M is found to be suitable and gives fly ash and bottom ash geopolymer mortars with compressive strengths of 35 and 18 MPa. 相似文献
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Koksal Fuat Gencel Osman Sahin Yusa Okur Osman 《Journal of Material Cycles and Waste Management》2021,23(3):985-1001
Journal of Material Cycles and Waste Management - Coal combustion waste reaches huge amount that causes environmental problem. In modern world, wastes generated from an industry can be used by... 相似文献