02377nas a2200229   4500008004100000022001400041245010200055210006900157260000800226300001200234490000700246520158300253653002601836653002601862653001801888653001101906100002601917700002801943700002701971700002601998856012302024       2019                        eng d  a0944-134400aProcess development of silica extraction from RHA: a cradle to gate environmental impact approach0 aProcess development of silica extraction from RHA a cradle to ga  cJAN  a492-5000 v263 a<p>India is one of the major rice-producing countries. Rice husk is a major agricultural by-product from rice production, which is used as a fuel in boilers. Its use as fuel produces huge amounts of silica-rich rice husk ash (RHA). This paper aims at providing an overall assessment of environmental impacts associated with the extraction of silica from RHAa process developed by our study group. The functional unit used in this study is production of 100kg of silica. The analysis included the extraction and transportation of other raw materials; RHA was assumed to be processed at the site. The study was conducted in accordance with the international ISO 14040 procedural framework. LCA is performed using GaBi Education software, and five midpoint indicators are chosen to assess the environmental impacts of silica extraction. The overall climate change (CC) of the extraction process is 7.26kg CO2 equivalent per kg of silica produced. A high contribution of calcination to CC is attributed to the use of electricity. The comprehensive environmental impacts of silica-rich RHA resulting from processing of RHA and improvement options to achieve sustainable production are presented. The negative impacts that can be avoided during silica extraction are also discussed. It is observed that calcination is a major contributor to the overall environmental indicators. The work also stresses on the use of renewable energy for electricity generation, which would help in decreasing the overall greenhouse gas emissions during extraction while ensuring waste utilization.</p>10aEnvironmental impacts10aLife cycle assessment10aRice husk ash10asilica1 aJoglekar, Saurabh, N.1 aKharkar, Rhushikesh, A.1 aMandavgane, Sachin, A.1 aKulkarni, Bhaskar, D.  uhttps://library.ncl.res.in/content/process-development-silica-extraction-rha-cradle-gate-environmental-impact-approach03566nas a2200325   4500008004100000022001400041245012200055210006900177260000800246300001400254490000700268520254600275653001302821653001202834653001702846653001302863653001802876653002302894100001802917700001802935700001502953700001602968700002502984700001803009700001903027700002303046700002203069700002303091856012603114       2023                        eng d  a2190-681500aSynthesis of advanced asbestos-free material using rice husk ash and marble waste for thermal insulation applications0 aSynthesis of advanced asbestosfree material using rice husk ash   cJUL  a8985-89980 v133 a<p>
	The importance and utilization of advanced thermal insulating materials increase due to their broad and irreplaceable energy conservation role. This paper describes the novel way of achieving insulating material. In two waste by-products, namely rice husk ash (RHA), agriculture waste, and marble waste powder (MWP), industrial waste has been utilized to make asbestos-free advanced material for thermal insulation. A novel method for making asbestos-free advanced material for thermal insulation using RHA and marble waste's inherent characteristics has developed mechano-chemical for appropriate physico-chemical consolidation, densification, and ceramic processing route. The Si and Ca sources undergo a series of chemical transformations accompanied by mass transfer and thermal reactions during the synthesis process. The formation of this silicate compound occurs due to the presence of higher contents of CaO in marble waste powder (MWP) and silica in rice husk ash (RHA), resulting in thermal insulating characteristics in the advanced thermal insulation material (ATIM). Raman spectra of ATIM after heating at 1100 degrees C were mainly amorphous, which had a broad peak at 1072 cm(-1). This shows thermal transformation occurs after the heating process, the admixture of tailored powder, and fly ash (FA). The density of the ATIM is found to be 1150 kg/m(3). The phase transformation (glass transition temperature) was found in all the samples between 600 and 800 degrees C. The mechanical properties, namely the compressive strength and impact strength evaluation test, showed that the material meets the standard specifications for ceramic tiles. The thermal conductivity (W/mK) was calculated from different temperature 30, 50, 100,150, and 200 degrees C and found to be 0.571, 0.541, 0.516, 0.498, and 0.477, respectively. According to the test results, it is concluded that ATIM from MWP, RHA, and FA were excellent insulating components. The novel feature of the reported process is the development of non-toxic and asbestos-free thermal insulating low-cost material wherein chemically designed and mineralogically formulating desired phases lead to the homogeneous and effective thermal insulating matrix. The process is feasible, simple, cheap, and highly energy-efficient, increases production efficiency, and is environmentally friendly. The widespread use of advanced material for a broad application spectrum ranges from aerospace, automobile, electronics, transportation, construction, to other industries.</p>
10aAsbestos10aFly ash10aMarble waste10aMaterial10aRice husk ash10aThermal insulation1 aVerma, Sarika1 aBajpai, Harsh1 aSuresh, S.1 aMili, Medha1 aGupta, Ritesh, Kumar1 aShetty, Rohit1 aKamble, Sanjay1 aKhan, Mohd., Akram1 aHashmi, S., A. R.1 aSrivastava, A., K.  uhttps://library.ncl.res.in/content/synthesis-advanced-asbestos-free-material-using-rice-husk-ash-and-marble-waste-thermal