• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Construction and Building Materials >Preparation of α-hemihydrate gypsum from phosphogypsum in recycling CaCl_2 solution
【24h】

Preparation of α-hemihydrate gypsum from phosphogypsum in recycling CaCl_2 solution

机译：回收CaCl_2溶液中的磷石膏制备α-半水石膏。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Preparing alpha-hemihydrate gypsum (alpha-HH) from phosphogypsum (PG) in electrolyte solution and atmospheric pressure has been developed as an energy-efficient and profitable method to dispose PG, which can alleviate its environmental contamination and reduce the use of natural gypsum. However, the used electrolyte solution in this method can trigger secondary pollution if not disposed properly. In this study, the feasibility of recycling electrolyte solution (CaCl2 solution) was investigated. Laboratory results suggested that CaCl2 solution could be recycled for only once due to the significant mechanical strength decrease of products, if it was directly recycled under the same reaction conditions. In contrast, when modifier dosage in each recycle was controlled properly, the alpha-HH with favourable crystal morphology and relatively high mechanical strength could be prepared. In this way, CaCl2 solution could be recycled for 6 times. Pilot scale tests further demonstrated that alpha-HH product of each recycle was purer than PG and the harmful substances of the alpha-HH could meet the requirements of relevant standards. These results suggest that the recycling use of CaCl2 solution in the hydrothermal preparation from PG to alpha-HH is feasible. (C) 2019 Elsevier Ltd. All rights reserved.
机译：由磷石膏（PG）在电解质溶液和大气压下制备α-半水石膏（α-HH）已被开发为一种高效节能的处置PG的方法，可减轻其对环境的污染并减少天然石膏的使用。但是，如果处理不当，此方法中使用的电解质溶液会引发二次污染。在这项研究中，研究了回收电解液（CaCl2溶液）的可行性。实验室结果表明，如果在相同的反应条件下直接回收CaCl2溶液，则由于产品的机械强度显着降低，因此只能回收一次。相反，当适当控制每个循环中的改性剂剂量时，可以制备具有良好晶体形态和较高机械强度的α-HH。这样，CaCl2溶液可以循环使用6次。中试测试进一步表明，每个循环中的α-HH产物均比PG更纯净，且α-HH的有害物质可以满足相关标准的要求。这些结果表明，在从PG到α-HH的水热制备过程中，CaCl2溶液的循环利用是可行的。 （C）2019 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Construction and Building Materials》 |2019年第30期|399-412|共14页
  • 作者

    Lu Wenda; Ma Baoguo; Su Ying; He Xingyang; Jin Zihao; Qi Huahui;

  • 作者单位

    Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Hubei, Peoples R China;

    Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Hubei, Peoples R China;

    Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Hubei, Peoples R China;

    Hubei Univ Technol, Sch Civil Engn, Wuhan 430068, Hubei, Peoples R China;

    Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Hubei, Peoples R China;

    Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Hubei, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Industrial solid waste; alpha-hemihydrate gypsum; Phosphogypsum; Electrolyte solution recycling;

    机译：工业固体废物;半水合石膏;磷石膏;电解质溶液回收;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

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