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 ›› 2019, Vol. 51 ›› Issue (8): 56-59.doi: 10.11962/1006-4990.2018-0563

• 环境·健康·安全 • 上一篇    下一篇

苛化法制备亚微米纺锤形碳酸钙联产氢氧化钠

刘在彤1,李常娥2,杨玉玲1,李国庭1   

  1. 1.河北科技大学,河北石家庄 050018
    2.河北百润环境检测技术有限公司
  • 收稿日期:2019-02-27 出版日期:2019-08-10 发布日期:2020-06-15
  • 作者简介:刘在彤(1992— ),女,硕士,主要研究方向为无机化工。

Preparation of sub-micron spindle-shaped calcium carbonate and sodium hydroxide co-production by causticizing method

Liu Zaitong1,Li Chang′e2,Yang Yuling1,Li Guoting1   

  1. 1. Hebei Univercity of Science & Technology,Shijiazhuang 050018
    2. Hebei Bairun Environmental Testing Technology Co.,Ltd.
  • Received:2019-02-27 Online:2019-08-10 Published:2020-06-15

摘要:

为了解决制碱白泥所带来的二次污染问题,在苛化法的基础上改进出一种新工艺。该工艺在制碱过程中不再副产白泥,而是将原料中的钙转化生成高附加值的亚微米纺锤形特种碳酸钙,并联产高含量的液体氢氧化钠。研究了消化与苛化工艺条件对碳酸钙粒径和氢氧化钠含量的影响,采用扫描电镜(SEM)对样品形貌做了表征。结果表明:在柠檬酸钠添加量为1%(质量分数)、消化水温为84 ℃、闷灰时间为40 min、加料时间为20 min的条件下,制备出颗粒短径为180 nm、粒径分布为150~200 nm、长径比为3的亚微米纺锤形碳酸钙,并联产出高含量的液体氢氧化钠。

关键词: 苛化, 亚微米碳酸钙, 纺锤形, 氢氧化钠

Abstract:

A new process was improved on the basis of causticizing method in order to solve the secondary pollution problem caused by alkali white mud.The calcium in the raw material was converted into a high value-added sub-micron spindle-shaped special calcium carbonate,a high content of liquid sodium hydroxide was produced in parallel and white mud was no longer produced in the process of alkali production by the new process.The influence of the conditions of digestion and causticization on the particle size of calcium carbonate and the content of sodium hydroxide were studied.The morphology of the sample was characterized by scanning electron microscope(SEM).Results showed that under the condition that the adding amount of sodium citrate was 1%(mass fraction),the temperature of digested water was 84 ℃,the time of smoldering was 40 min and the feeding time was 20 min,a submicron spindle-shaped calcium carbonate with short diameter of 180 nm,particle size distribution of 150~200 nm and length-diameter ratio of 3 was prepared,and a high content of liquid sodium hydroxide was produced in parallel.

Key words: causticizing, sub-micron calcium carbonate, spindle shape, sodium hydroxide

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