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 (10): 86-94.doi: 10.19964/j.issn.1006-4990.2024-0081

• 环境·健康·安全 • 上一篇    下一篇

磷石膏共反浮选除杂增白工艺研究

陈小红1(), 余意1, 朱淼1, 叶恒朋1(), 陈绍华1, 李育彪2   

  1. 1.中南民族大学资源与环境学院, 湖北省重金属污染防治工程技术研究中心, 湖北 武汉 430074
    2.武汉理工大学资源与环境学院, 湖北 武汉 430074
  • 收稿日期:2024-02-07 出版日期:2024-10-10 发布日期:2024-11-05
  • 通讯作者: 叶恒朋(1977— ),男,博士(后),教授,主要研究方向为固废资源化利用;E-mail:yehengpeng@mail.scuec.edu.cn
  • 作者简介:陈小红(2000— ),男,硕士研究生,研究方向为固废资源化利用;E-mail:2210937629@qq.com
  • 基金资助:
    湖北省科技重大专项(2022ACA004-6);湖北三峡实验室开放创新基金项目(SC232006)

Study on co⁃reverse flotation process of phosphogypsum for impurity removal and whitening

CHEN Xiaohong1(), YU Yi1, ZHU Miao1, YE Hengpeng1(), CHEN Shaohua1, LI Yubiao2   

  1. 1.Hubei Province Engineering Research Center for Control and Treatment of Heavy Metal Pollution,College of Resources and Environment,South?central Minzu University,Wuhan 430074,China
    2.School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430074,China
  • Received:2024-02-07 Published:2024-10-10 Online:2024-11-05

摘要:

磷石膏中硅、有机质和可溶性氟等杂质严重制约磷石膏增值化利用。目前,浮选法是运用最广的预处理工艺,但正浮选成本高、工艺复杂,传统反浮选药剂稳定性和分散性差。针对以上问题,以磷石膏为研究对象,通过一段式共反浮选工艺对磷石膏中硅、有机质和可溶性氟等杂质的脱除展开了研究,并对新型苄基季铵盐共反浮选药剂(PG-1)反浮选后的精矿进行了SEM-EDS、XRD和XPS分析。结果表明:在矿浆自然pH为2.3~2.5,甲基异丁基甲醇(MIBC)用量为300 g/t、PG-1用量为300 g/t、矿浆浓度为25%(质量分数)、曝气量为0.20 m3/h的最佳工艺条件下,CaSO4·2H2O质量分数为86.75%、SiO2质量分数为6.68%、白度为32.59%、有机质质量分数为0.72%、可溶性氟质量分数为0.40%的原磷石膏经过一段式共反浮选除杂增白后,可获得SiO2质量分数为2.47%、白度为63.74%、有机质质量分数为0.03%、可溶性氟质量分数为0.039%、产率为80.17%、CaSO4·2H2O质量分数为93.52%的磷石膏精矿,达到了GB/T 23456—2018《磷石膏》中建材石膏一级品的要求。该研究为磷石膏增值化利用的预处理过程提供了一种新方法。

关键词: 磷石膏, 共反浮选, 脱硅, 增白, 纯化

Abstract:

Impurities such as silicon,organic matter,and soluble fluoride in phosphogypsum severely restrict its value⁃added utilization.Currently,the flotation method is the most widely used pretreatment process,but positive flotation has high costs and complex processes,and traditional reverse flotation agents have poor stability and dispersibility.To address these issues,this study focused on phosphogypsum and research on the removal of silicon,organic matter,and soluble fluoride impurities in phosphogypsum was conducted through a one⁃stage co⁃reverse flotation process.The concentrate after new benzyl quaternary ammonium salt co⁃reverse flotation reagent(PG-1) reverse flotation was analyzed by SEM-EDS,XRD and XPS.The results showed that under the optimal process conditions of natural slurry pH of 2.3~2.5,MIBC dosage of 300 g/t,PG-1 dosage of 300 g/t,slurry concentration of 25%,and aeration rate of 0.20 m3/h,the raw phosphogypsum had a CaSO4·2H2O content was 86.75%,SiO2 content was 6.68%,whiteness was 32.59%,organic matter content was 0.72%,and soluble fluoride content was 0.40%.After a one⁃stage co⁃reverse flotation to remove impurities and increase whiteness,the obtained phosphogypsum concentrate had a SiO2 content of 2.47%,whiteness of 63.74%,organic matter content of 0.03%,soluble fluoride content of 0.039%,a yield of 80.17%,and CaSO4·2H2O content of 93.52%,meeting the requirements of the building gypsum first⁃grade product in the national standard GB/T 23456—2018“phosphogypsum”.This research provided a new method for the pretreatment process of value⁃added use of phosphogypsum.

Key words: phosphogypsum, co-reverse flotation, desilication, whitening, purification

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