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 (7): 88-95.doi: 10.19964/j.issn.1006-4990.2023-0525

• 环境·健康·安全 • 上一篇    下一篇

焙烧工艺及典型杂质对磷石膏还原分解过程影响研究

胡典1(), 郭泽2, 张汉泉2, 路漫漫2()   

  1. 1.武汉工程大学光电信息与能源工程学院数理学院,湖北 武汉 430205
    2.武汉工程大学资源与安全工程学院,湖北 武汉 430205
  • 收稿日期:2023-11-05 出版日期:2024-07-10 发布日期:2024-08-01
  • 通讯作者: 路漫漫(1989— ),男,副教授,主要从事复杂铁矿综合利用、铁矿造块等研究;E-mail:lummwit@wit.edu.cn
  • 作者简介:胡典(2003— ),男;E-mail:hthd701@163.com
  • 基金资助:
    武汉工程大学研究生教育创新基金资助项目(CX2022574)

Research on effects of roasting process and typical impurities on reduction and decomposition process of phosphogypsum

HU Dian1(), GUO Ze2, ZHANG Hanquan2, LU Manman2()   

  1. 1.School of Optoelectronic Information and Energy Engineering,School of Mathematics and Physics,Wuhan;Institute of Technology,Wuhan 430205,China
    2.School of Resources and Safety Engineering,Wuhan University of Engineering,Wuhan 430205,China
  • Received:2023-11-05 Published:2024-07-10 Online:2024-08-01

摘要:

磷石膏是湿法磷酸工业副产物,因杂质含量高,种类繁杂而难以利用,堆存量巨大。以磷石膏原矿、纯化磷石膏为原料进行还原分解研究,揭示了焙烧工艺和杂质对磷石膏高温分解制备CaS过程的影响规律,结果表明:磷石膏原矿、纯化磷石膏分解反应在60 min时趋于平衡,反应烧失度分别可达47.77%、54.44%;产品在焙烧温度为900 ℃、还原剂配比为15%(质量分数,下同)以上时无CaSO4残留。磷石膏转化成CaS的最佳条件为焙烧时间为60 min、焙烧温度为950 ℃、还原剂配比为30%,在此条件下纯化磷石膏组还原分解产物CaS质量分数最高可达76.33%,高于同条件下磷石膏原矿组的57.37%。在磷石膏中掺杂一定量SiO2、NaF、Ca3(PO42,通过与反应中间产物CaO结合可使产品CaS质量分数分别降低1.41%~12.27%、0.61%~11.48%、1.85%~4.82%。

关键词: 磷石膏, 热分解, CaS, 杂质, 机理

Abstract:

Phosphogypsum is a by⁃product of industrial wet phosphoric acid production,but because of its high impurity content,it is difficult to utilize,resulting in a huge stockpile.A reduction and decomposition study was conducted using phosphogypsum raw ore and purified phosphogypsum as raw materials,revealing the effects of roasting process and impurities on the high⁃temperature decomposition of phosphogypsum to prepare CaS.The results showed that the decomposition reaction of phosphogypsum raw ore and purified phosphogypsum tended to equilibrium at 60 min,and the reaction loss on ignition could reach 47.77% and 54.44%,respectively.When the product was calcined at 900 ℃ and the reducing agent ratio was above 15%(mass fraction,the same below),there was no residual CaSO4.The best conditions for the conversion of phosphogypsum into CaS were:the roasting time of 60 min,the roasting temperature of 950 ℃ and the reducing agent ratio of 30%.Under the same conditions,the CaS content of the reduced decomposition products of the purified phosphogypsum group was up to 76.33%,which was higher than that of the phosphogypsum raw ore group under the same conditions(57.37%).A certain amount of SiO2,NaF and Ca3(PO42 were doped in phosphogypsum,and the CaS content of the product could be reduced by 1.41%~12.27%,0.61%~11.48% and 1.85%~4.82%,respectively by combining with the reaction intermediate product CaO.

Key words: phosphogypsum, thermal decomposition, CaS, impurity, mechanism

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