处理和焚烧温度对稻壳中二氧化硅提取的影响

Nur Izzah Azlan, Syed Ahmad Farhan, Mohamed Mubarak Abdul Wahab, Nadzhratul Husna, Nur Aqila Mohd Hamka, Siti Nooriza Abd Razak
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摘要

利用稻壳灰作为火山灰材料是减少露天焚烧稻壳所造成的大气污染的可行解决方案。用高浓度酸处理稻壳,然后将处理后的稻壳在高温下进行受控焚烧,可以产生含有高纯度二氧化硅的RHA,这可以促进混凝土的高火山灰反应性。然而,对高浓度酸的依赖和高焚烧温度会对环境产生不利影响。因此,在本研究中,通过对混凝土样品进行分析和抗压强度试验,研究了处理和焚烧温度对RHA中二氧化硅提取的影响。生稻壳和处理稻壳分别在400,500和600°C下焚烧1小时,分别产生未经处理和处理的RHA。采用水热合成法将RHA凝胶化二氧化硅。硅胶被转化成粉末,然后掺入混凝土混合物中制备样品。所述样品包括不含从RHA中提取的任何二氧化硅的对照样品,以及含有从未处理和处理的RHA中提取的5%二氧化硅的对照样品。研究结果表明,处理是必要的,以产生足够的抗压强度的混凝土相对于传统的混凝土。在600℃的焚烧温度下,掺加5%二氧化硅的RHA抗压强度最高,达到6.44 MPa,比常规混凝土抗压强度提高8.5%。
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Effect of Treatment and Incineration Temperature on Extraction of Silica from Rice Husk for Cement Replacement in Concrete
Utilization of rice husk ash (RHA) as a pozzolanic material is a viable solution for reducing air pollution that is caused by open incineration of rice husk. Treatment of the rice husk with high-concentration acid and subsequently subjecting the treated rice husk to controlled incineration at high temperature can produce RHA that contains silica of a high purity, which can contribute to a high pozzolanic reactivity of concrete. However, the dependence of high-concentration acid and high incineration temperature will have an adverse effect on the environment. Therefore, in the present study, effect of treatment and incineration temperature on extraction of silica from RHA was investigated by conducting analytical and compressive strength tests on concrete samples. Raw and treated rice husks were incinerated for an hour at 400, 500 and 600°C to produce untreated and treated RHA, respectively. Hydrothermal synthesis was performed to execute gelation of silica from the RHA. The silica gel was converted into powder and then incorporated into concrete mixes for preparation of samples. The samples comprise the control sample, which does not contain any of the silica extracted from the RHA, and those that contain 5% silica from the untreated and treated RHA. Findings indicate that the treatment was necessary to produce concrete with adequate compressive strength relative to that of conventional concrete. Incorporation of 5% silica from treated RHA at the incineration temperature of 600°C resulted in the highest compressive strength of 6.44 MPa, which is an increase of 8.5% from that of the conventional concrete.
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