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 ›› 2024, Vol. 56 ›› Issue (3): 45-50.doi: 10.19964/j.issn.1006-4990.2023-0235

• 研究与开发 • 上一篇    下一篇

自贡地下卤水制备富锶功能盐工艺研究

苏鑫1(), 赖冬梅2, 周源1, 朱霞萍1()   

  1. 1.成都理工大学材料与化学化工学院矿产资源化学四川省重点实验室, 四川 成都 610059
    2.四川省产品质量监督检验检测院, 四川 成都 610100
  • 收稿日期:2023-04-25 出版日期:2024-03-10 发布日期:2024-03-14
  • 通讯作者: 朱霞萍(1968— ),女,博士,教授,硕士生导师;E-mail: zhuxiaping@cdut.edu.cn
  • 作者简介:苏鑫(1999— ),男,在读硕士研究生,研究方向为矿物的开发与利用;E-mail:1021138451@qq.com
  • 基金资助:
    企业横向委托项目(SHL080);四川省市场监督管理局科技计划项目(SCSJZ2023003)

Study on preparation process of strontium rich functional salt from Zigong underground brine

SU Xin1(), LAI Dongmei2, ZHOU Yuan1, ZHU Xiaping1()   

  1. 1.College of Materials and Chemistry and Chemical Engineering,Chengdu University of Technology,Key Laboratory of Mineral Resources Chemistry,Chengdu 610059,China
    2.Sichuan Institute of Product Quality Supervision,Inspection and Testing,Chengdu 610100,China
  • Received:2023-04-25 Published:2024-03-10 Online:2024-03-14

摘要:

自贡地下卤水蕴含丰富的钠、镁、锂、溴、锶等,可用于生产原盐、镁盐和溴素等工业产品,是碱工业和盐产业重要的液态矿产资源。针对自贡地下卤水富含锶的特点和食盐生产工艺现状,开发了富锶食盐。通过优选草酸作为卤水净化剂,实现卤水除钙镁的同时保留更多的锶,优化的卤水净化工艺:将5.2 mL浓度为 0.7 mol/L的草酸以5 mL/min匀速滴加到45 ℃的100 mL卤水中,调节pH至8.0,搅拌反应30 min后加入0.3 mL质量浓度为2 g/L相对分子质量为800万的聚丙烯酰胺,静置1 h。优化工艺得到的净化卤水经高温蒸发后制得的食盐(以100 g干基计)中锶含量为37.5 mg,是现市售食盐中锶含量的20倍,锶盐其他各项指标均符合GB 2721—2015《食品安全国家标准 食用盐》,新工艺实现了自贡卤水锶的综合利用,也为市民提供富锶功能盐的选择。

关键词: 地下卤水, 净化, 锶, 食盐

Abstract:

Underground brine in Zigong contains rich sodium,magnesium,lithium bromide,strontium,etc.It can be used to produce raw salt,magnesium salt,bromine and other industrial products,which is an important liquid mineral resource for the alkali industry and salt industry.In response to the characteristics of rich strontium in underground brine in Zigong and the current status of salt production technology,strontium rich salt was developed.By optimizing oxalic acid as brine purifying agents,calcium and magnesium were removed from brine,and more strontium was retained.The optimized brine purification process was as follows:adding 5.2 mL of oxalic acid with concentration of 0.7 mol/L at a constant rate of 5 mL/min to 100 mL of brine at 45 ℃,adjusting the pH to 8.0,stirring for 30 min,adding 0.3 mL of polyacrylamide with mass concentration of 2 g/L and molecular weight of 8 million,allowing the final solution to stand for 1 h.The strontium content in the table salt(100 g dry basis) prepared by high-temperature evaporation of purified brine obtained by optimizing the process was 37.5 mg,which was 20 times of the strontium content in the currently available table salt.The strontium salts and other index requirements complied with the national standard(GB 2721—2015).The new process realized the comprehensive utilization of strontium in Zigong brine,and also provided citizens with the choice of strontium rich functional salts.

Key words: underground brine, purification, strontium, table salt

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