Rice Husk Ash as a Renewable Source for the Production of Value Added Silica Gel and its Application: An Overview

Прасад, Рам; Pandey, Manish Kumar

doi:10.9767/bcrec.7.1.1216.1-25

Cited by 79 publications

(46 citation statements)

References 108 publications

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“…The high silica content dilutes the concentration of all other components, including that of the bases. The mean contents of Ca, Mg, K, and Na in wood ash cited by Nkana et al (2002), Ozolincius et al (2005), Lima et al (2009), andRisse (2013) are much higher than in the RHA in this study (Table 1) or those cited elsewhere, by Chandrasekhar et al (2005Chandrasekhar et al ( , 2006, Gonçalves & Bergmann (2007), Pauletto et al (1990) and Prasad & Pandey (2012). Undoubtedly, the fraction of each cation in the form of base, salt or adsorbed to negative charges of solids present in the ash varies between the materials.…”

Section: Effect Of Liming On Soil Phsupporting

confidence: 45%

Rice husk ash as corrective of soil acidity

Islabão

Vahl²,

Timm³

et al. 2014

Rev. Bras. Ciênc. Solo

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SUMMARYRice husk ash (RHA) is a by-product from the burning of rice husk that can have favorable effects on the soil in terms of acidity correction. The objectives of this study were to determine the effective calcium carbonate equivalent (ECC) of RHA under field conditions, and establish technical criteria as a basis for estimating the overall ECC of RHA. The 12 treatments of the experiment consisted of 10 RHA dosages (0, 10, 20, 30, 40, 60, 80, 100, 120, and 140 Mg ha -1 ) and two references, one of which was an absolute control (AC) and the other a plot limed and fertilized according to official recommendations (recommended fertilization -RF). The soil was sampled twice (15 and 210 days after incorporating RHA), in the layers 0.00-0.10 and 0.10-0.20 m, to determine the pH(H 2 O) and base saturation (V%). The ECC and neutralizing value (NV) of RHA were also determined. The results showed that RHA neutralizes soil acidity, in a faster reaction than conventional limestone, despite a low ECC (around 3 %).Index terms: acidity correction, neutralizing value, effective calcium carbonate equivalent. RESUMO: CINZA DE CASCA DE ARROZ COMO CORRETIVO DE ACIDEZ DO SOLOA cinza de casca de arroz (CCA) é produzida a partir da queima da casca de arroz proveniente dos processos de beneficiamento, podendo apresentar efeitos favoráveis sobre a correção da acidez no solo. Os objetivos deste trabalho foram quantificar o poder relativo de neutralização total (PRNT) da CCA em condições de campo e elaborar critérios técnicos que sirvam de base para a estimativa do PRNT das CCAs em geral. O experimento foi constituído por 12 tratamentos compostos por 10 dosagens de CCA equivalentes a 0, 10, 20, 30, 40, 60, 80, 100, 120 e 140 Mg ha -1 e duas referências, sendo uma testemunha absoluta (TA) e outra com calagem e adubação recomendada (AR). Foram realizadas duas amostragens de solo aos 15 e 210 dias, após a incorporação da CCA, nas camadas de 0,00-0,10 e 0,10-0,20 m para a determinação do pH(H 2 O), e da saturação por bases (V%). Também foram determinados o PRNT e o poder de neutralização (PN) da CCA. Os resultados evidenciaram que a cinza de casca de arroz atua como corretivo de acidez de solo, reagindo mais rápido que o calcário convencional, mas apresentando PRNT baixo, da ordem de 3 %.Termos de indexação: correção de acidez, poder de neutralização, poder relativo de neutralização total.

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Section: Effect Of Liming On Soil Phsupporting

confidence: 45%

Rice husk ash as corrective of soil acidity

Islabão

Vahl²,

Timm³

et al. 2014

Rev. Bras. Ciênc. Solo

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“…Several studies have been carried out to review the field of biogenic silica production and combustion of RH and RS as raw materials [24,50,51,55,[75][76][77][78][79][80][81][82][83][84][85][86][87][88][89]. Most of these studies have focused on applications of the rice husk ash (RHA), rice straw ash (RSA) and pure biogenic silica [50,75,81,[88][89][90] or the synthesis of advanced materials from RHA and RSA [50,76,77,90], influence of RHA and RSA on concrete and cement properties [78,80,86,87] or energy and power generation using RH and RS [79,82,85].…”

Section: Introductionmentioning

confidence: 99%

Generation of High Quality Biogenic Silica by Combustion of Rice Husk and Rice Straw Combined with Pre- and Post-Treatment Strategies—A Review

et al. 2019

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Utilization of biomass either as a renewable energy source or for the generation of biogenic materials has received considerable interest during the past years. In the case of rice husk (RH) and rice straw (RS) with high silica contents in the fuel ash, these approaches can be combined to produce high-grade biogenic silica with purities >98 wt % from combustion residues. The overall process can be considered nearly neutral in terms of CO2 emission and global warming, but it can also address disposal challenges of rice husk and rice straw. For the resulting biogenic silica, several advanced application opportunities exist, e.g., as adsorbents, catalysts, drug delivery systems, etc. This article provides a comprehensive literature review on rice husk and rice straw combustion as well as applied strategies for raw material pre-treatment and/or post-treatment of resulting ashes to obtain high quality biogenic silica. Purity of up to 97.2 wt % SiO2 can be reached by combustion of untreated material. With appropriate fuel pre-treatment and ash post-treatment, biogenic silica with purity up to 99.7 wt % can be achieved. Studies were performed almost exclusively at a laboratory scale.

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“…Considering the high amount of porous silica in rice husk (RH) and rice husk ash (RHA) structure, this residue has been considered as cheap raw source of silica in various industries [14][15][16][17][18]. Since RHA actually consists of silica (variable from 60% to 80%), it is resistant to thermal shocks (higher than 600°C) and has a low weight loss in the air atmosphere [17,18].…”

Section: Introductionmentioning

confidence: 99%