无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2014, Vol. 46 ›› Issue (10): 58-.

• 论文 • 上一篇    下一篇

磷石膏与碳酸钙对赤泥脱碱的效果及可能机理

喻阳华1,2, 吴永贵3, 喻理飞1,申万暾4   

  1. 1.贵州大学林学院,贵州贵阳 550025;2.仁怀市环境保护局;
    3.贵州大学资源与环境工程学院;4.贵阳市两湖一库环境保护监测站
  • 出版日期:2014-10-10 发布日期:2014-10-09

Effect and mechanism of phosphogypsum and CaCO3 on dealkalization of red mud

Yu Yanghua1,2,Wu Yonggui3,Yu Lifei1,Shen Wantun4   

  1. 1.College of Forestry,Guizhou University,Guiyang 550025,China;2.Renhuai Environmental Protection Administration;
    3.College of Resource and Environmental Engineering,Guizhou University;
    4.Two Lakes and One Reservoir Environmental Protection Monitoring Station of Guiyang City
  • Online:2014-10-10 Published:2014-10-09

摘要: 为降低赤泥中的碱分,增加赤泥资源化、无害化利用途径,探索采用磷石膏和碳酸钙为脱碱剂脱除赤泥中的碱分的效果。结果表明:采用磷石膏和碳酸钙脱除赤泥中的碱时,振荡0.5 h即可使振荡液的pH和EC(电导率)值达到稳定状态,耗时较短。赤泥脱碱效率的高低并不直接依赖于脱碱剂与赤泥的配比、延长脱碱时间等手段。在考虑脱碱效果和经济成本的前提下,m(赤泥)∶ m(磷石膏)、m(赤泥)∶ m(碳酸钙)依次为1∶0.4和1∶0.2。钙化合物添加后,与赤泥发生置换反应,赤泥中更多的结合碱能够被置换出来成为游离碱,进而得到脱除。

关键词: 赤泥, 脱碱, 磷石膏, CaCO3

Abstract: In order to reduce alkali and increase harmless utilization of red mud,phosphorus gypsum and CaCO3 were used as dealkalization agents.Results showed that oscillation of 0.5 h,a very short time could make the pH and EC values stable. Dealkalization efficiency neither depended directly on the ratio between dealkalization agent and red mud,nor the dealkalization time.Considering the dealkalization effeciency and economic cost,the mass ratio between red mud and phosphogypsum was 1∶ 0.4,and red mud and CaCO3 was 1∶ 0.2.After adding the calcium compounds,they reacted with red mud,thus more combined alkali was replaced into free alkali so as to be removed.

Key words: red mud, dealkalization, phosphogypsum, CaCO3