Sinyoung Suthatip, Kunchariyakun Kittipong, Asavapisit Suwimol, MacKenzie Kenneth J D
Division of Engineering, Mahidol University Kanchanaburi Campus, Kanchanaburi, Thailand.
School of Engineering and Resources, Walailuk University, Nakhonsithammarat, Thailand.
J Environ Manage. 2017 Apr 1;190:53-60. doi: 10.1016/j.jenvman.2016.12.016. Epub 2016 Dec 29.
Nano-silicas extracted from a pure rice husk ash calcined in the laboratory (RHA) and ash from an impure industrial rice husk waste (BRHA), were used to form belite cement by firing with two different calcium sources (calcium carbonate and calcium nitrate). The nano-silica extracted from RHA was highly reactive due to its high pore volume and low activation energy of dehydration. The formation of belite cement from both nano-silicas was studied by firing with two different calcium sources, Ca(NO) and CaCO at 800-1100 °C. Both nano-silicas formed the principal phase in belite cement (larnite or β-CS) at temperatures as low as 800 °C, especially with calcium nitrate as the calcium source. Thus, highly impure BRHA is shown to be very suitable as a starting material for the low-temperature production of belite cement, especially in conjunction with calcium nitrate as the calcium source.
从实验室煅烧的纯稻壳灰（RHA）中提取的纳米二氧化硅以及来自不纯工业稻壳废料的灰分（BRHA），与两种不同的钙源（碳酸钙和硝酸钙）一起煅烧，用于形成贝利特水泥。从RHA中提取的纳米二氧化硅由于其高孔隙率和低脱水活化能而具有高反应活性。通过在800-1100°C下与两种不同的钙源Ca(NO)和CaCO3一起煅烧，研究了两种纳米二氧化硅形成贝利特水泥的情况。两种纳米二氧化硅在低至800°C的温度下都形成了贝利特水泥中的主要相（硅钙石或β-C2S），特别是以硝酸钙作为钙源时。因此，高度不纯的BRHA被证明非常适合作为低温生产贝利特水泥的起始原料，特别是与硝酸钙作为钙源结合使用时。
