• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国卫生研究院文献>Materials >Comparative Study of Water-Leaching and Acid-Leaching Pretreatment on the Thermal Stability and Reactivity of Biomass Silica for Viability as a Pozzolanic Additive in Cement
【2h】

Comparative Study of Water-Leaching and Acid-Leaching Pretreatment on the Thermal Stability and Reactivity of Biomass Silica for Viability as a Pozzolanic Additive in Cement

机译：浸水和酸浸预处理对生物质二氧化硅作为火山灰添加剂的热稳定性和反应性的比较研究

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The present work aims to introduce a novel and eco-friendly method, i.e., a water-leaching pretreatment for extracting highly reactive biomass silica from rice husk (RH), for viability as a pozzolanic additive in cement. For comparison, the traditional acid pretreatment method was also employed throughout the experimental study. The silica from RH was extracted using boiled deionized water and acid solution as leaching agents to remove the alkali metal impurities, and then dried and submitted to pyrolysis treatment. The results indicated that potassium was found to be the major contaminant metal inducing the formation of undesirable black carbon particles and the decrease in crystallization temperature of amorphous RHA silica. The boiling-water-leaching pretreatment and acid-leaching pretreatment on RHs significantly removed the metallic impurities and reduced the crystallization sensitivity of RHA silica to calcination temperature. A highly reactive amorphous silica with purity of 96% was obtained from RH via 1 N hydrochloric acid leaching followed by controlled calcination at 600 °C for 2 h. The acid treatments increased the crystallization temperature of silica to 1200 °C and retained the amorphous state of silica for 2.5 h. In the case of water-leaching pretreatment, leaching duration for 2.5 h could yield an amorphous silica with purity of 94% and render the silica amorphous at 900 °C for 7 h. The RHA silica yielded by water-leaching pretreatment presented a comparable enhancing effect to that of acid leaching on hydration and improved the strength of cement. Furthermore, compared with the acid-leaching method, the water-leaching pretreatment method is more environmentally friendly and easier to operate, and hence more widely available.
机译：本工作旨在介绍一种新颖且环保的方法，即一种从稻壳（RH）中提取高反应性生物质二氧化硅的水浸预处理，以在水泥中用作火山灰添加剂。为了进行比较，在整个实验研究中还采用了传统的酸预处理方法。使用沸腾的去离子水和酸性溶液作为浸出剂从RH中提取二氧化硅，以去除碱金属杂质，然后干燥并进行热解处理。结果表明，钾是导致不希望的黑碳颗粒形成和非晶RHA二氧化硅结晶温度降低的主要杂质金属。在RH上进行沸水浸出预处理和酸浸预处理可以显着去除金属杂质，并降低RHA二氧化硅对煅烧温度的结晶敏感性。通过1 N盐酸浸出后，从RH获得纯度为96％的高反应性无定形二氧化硅，然后在600°C下控制煅烧2 h。酸处理将二氧化硅的结晶温度提高到1200°C，并保持二氧化硅的非晶态2.5 h。在水浸预处理的情况下，浸出持续2.5 h可以得到纯度为94％的无定形二氧化硅，并在900°C的条件下将其变成7 h。通过水浸预处理得到的RHA二氧化硅具有与酸浸水化相当的增强效果，并提高了水泥的强度。此外，与酸浸法相比，水浸预处理方法对环境更友好且更易于操作，因此得到了更广泛的应用。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号