共查询到20条相似文献,搜索用时 500 毫秒
1.
2.
3.
4.
5.
基于吸附的粉煤灰改性利用研究进展 总被引:1,自引:0,他引:1
粉煤灰是可改性能较强的工业废弃物,充分利用改性粉煤灰的吸附性能,不仅保护环境,而且能实现粉煤灰的高附加值利用。介绍了物理改性、化学改性等不同改性方法的研究进展及吸附应用;指出复合改性工艺,尤其是物理与化学改性工艺的复合使用,是粉煤灰改性研究的重要趋势。 相似文献
6.
7.
8.
9.
10.
用粉煤灰制造陶瓷膜片多孔滤料 总被引:1,自引:0,他引:1
用粉煤灰制造陶瓷膜片多孔滤料朱伟明(首钢动力厂)前言目前,国外把粉煤灰研究的重点放在解决环境污染问题或资源循环利用方面,至于用粉煤灰开发具有高附加值、高技术产品,做的工作不多。本文介绍利用粉煤灰制造具有高附加值和高技术的产品-陶瓷膜片多孔滤料的方法。... 相似文献
11.
12.
粉煤灰是火力发电行业煤炭燃烧工业的副产品,是中国固体废弃物污染的主要来源。粉煤灰富含氧化铝,所以又是潜在的铝土矿的替代品。从粉煤灰中提取氧化铝不仅可以减少粉煤灰对环境的污染,而且能缓解中国铝土资源短缺的问题。对粉煤灰性质、危害、粉煤灰利用现状以及中国铝土资源现状做了分析,论证了粉煤灰提取氧化铝的必要性;详细介绍了石灰石烧结法、硫酸铵烧结法和一步酸溶法的工艺路线、建设生产情况及各工艺的优缺点,为粉煤灰提取氧化铝的发展提出建议,并呼吁加强粉煤灰提取铝工艺方法的研究力度。 相似文献
13.
粉煤灰是燃煤电厂排出的主要固体废物,粉煤灰主要用于混凝土添加剂,附加值较低.为了提高粉煤灰的利用价值,本研究利用粉煤灰制备轻质高强陶粒.在1100 ℃煅烧时,粉煤灰陶粒烧结出现新物相钙长石,在1200 ℃煅烧时,石英相溶解到烧结物相中,粉煤灰陶粒烧结出现新物相普通辉石,煅烧温度控制在1100~1200 ℃范围较适宜.煅烧温度增加到1200 ℃时,筒压强度达到6.3 MPa左右,体积密度达到1.6 g/cm3左右.当P值较低时,粉煤灰陶粒的烧成温度降低,陶粒容易烧胀,当P值超过10时,粉煤灰陶粒的烧成温度过高,粉煤灰陶粒不易发生膨胀. 相似文献
14.
15.
《Fuel》2007,86(7-8):1008-1020
Co-firing straw with coal in pulverized fuel boilers can cause problems related to fly ash utilization, deposit formation, corrosion and SCR catalyst deactivation due to the high contents of Cl and K in the ash. To investigate the interaction between coal and straw ash and the effect of coal quality on fly ash and deposit properties, straw was co-fired with three kinds of coal in an entrained flow reactor. The compositions of the produced ashes were compared to the available literature data to find suitable scaling parameters that can be used to predict the composition of ash from straw and coal co-firing. Reasonable agreement in fly ash compositions regarding total K and fraction of water soluble K was obtained between co-firing in an entrained flow reactor and full-scale plants. Capture of potassium and subsequent release of HCl can be achieved by sulphation with SO2 and more importantly, by reaction with Al and Si in the fly ash. About 70–80% K in the fly ash appears as alumina silicates while the remainder K is mainly present as sulphate. Lignite/straw co-firing produces fly ash with relatively high Cl content. This is probably because of the high content of calcium and magnesium in lignite reacts with silica so it is not available for reaction with potassium chloride. Reduction of Cl and increase of S in the deposits compared to the fly ashes could be attributed to sulphation of the deposits. 相似文献
16.
17.
《分离科学与技术》2012,47(7):1019-1028
Hospital solid waste (HSW) incinerator fly ash was designated as a special controlled waste because of its high concentrations of toxic heavy metals, polychlorinated dibenzo-p-dioxins, and dibenzofurans (PCDD/Fs). Most of the PCDD/Fs along with carbon constituents including powder activated carbon and unburned carbon in fly ash could be removed by column flotation on the basis of their hydrophobicity. The feasibility of extracting heavy metals from fly ash by adding a little of hydrochloric acid to the slurry during the flotation process was examined in this paper. The results showed that the acidic pulp could contribute to the high extraction ratio of the heavy metals, but the performance of decarburization and removal of PCDD/Fs was inhibited at very low pH value. Given consideration to the removal of two toxic matter including PCDD/Fs and heavy metals in HSW incinerator fly ash, the appropriate pulp pH value should be controlled at about 5. After flotation, both PCDD/Fs and heavy metals in the tailings could simultaneously meet the permitted limits of a landfill site of municipal solid waste in China. It was suggested that flotation with the assistance of an appropriate amount of acid might be a potential technology for the treatment of HSW incinerator fly ash. 相似文献
18.
19.
大型火力发电厂在生产运行过程中产生大量的粉煤灰,长期积存堆放,污染环境、占用土地.华能德州电厂通过研究实践,采用粉煤灰分选技术,生产出市场前景广阔的建材原料-微珠,提高了产品附加值,实现了废弃物的综合利用. 相似文献
20.
Aluminium extraction and leaching characteristics of Talcher Thermal Power Station fly ash with sulphuric acid 总被引:2,自引:0,他引:2
Niva Nayak 《Fuel》2010,89(1):53-58
Although fly ash disposal is of environmental concern the quality of residues can be improved with respect to high value applications. Fly ash is considered as a potential source of aluminium and other strategic metals. Leaching and metal extraction behaviour of fly ash collected from Talcher Thermal Power Station have been thoroughly studied using sulphuric acid as extractant. The chemical and mineralogical composition of post-leached samples have been determined. Aluminium extraction by direct leaching at low acid concentration and ambient temperature is not suitable for high recovery. The extraction efficiency of aluminium increases significantly at a higher solid:liquid ratio. It is evident that the leachability of metals from fly ash depends on the nature of leaching medium, solid:liquid ratio, temperature and leaching time. 相似文献