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 ›› 2021, Vol. 53 ›› Issue (11): 95-99.doi: 10.19964/j.issn.1006-4990.2021-0075

• 环境·健康·安全 • 上一篇    下一篇

低品位混合型磷矿的碳热还原工艺

何燕君(),郑寒笑,吕莉(),唐盛伟   

  1. 四川大学化工学院,四川成都 610065
  • 收稿日期:2021-02-01 出版日期:2021-11-10 发布日期:2021-11-15
  • 作者简介:何燕君(1997— ),女,硕士研究生,研究方向为磷化工;E-mail: he_yan_jun@stu.scu.edu.cn
  • 基金资助:
    国家重点研发计划项目(2018YFC1900201)

Carbothermal reduction process of low-grade mixed phosphate ore

HE Yanjun(),ZHENG Hanxiao,LÜ Li(),TANG Shengwei   

  1. School of Chemical Engineering,Sichuan University,Chengdu 610065,China
  • Received:2021-02-01 Published:2021-11-10 Online:2021-11-15

摘要:

以窑法工艺对云南晋宁低品位磷矿的碳热还原性能进行研究。采用4因素5水平正交实验探究反应温度、反应时间、碳过量系数、硅钙物质的量比对磷矿碳热反应还原率的影响。实验结果表明,影响磷矿还原率由大到小的顺序依次为,反应温度、碳过量系数、反应时间、硅钙物质的量比。反应温度为1 300 ℃、碳过量系数 为2.6、反应时间为1.5 h、硅钙物质的量比为1.5时,还原率可达到最高值94.27%。同时,对云南晋宁低品位混合型磷矿用于窑法磷酸生产的适应性进行评价,表明该混合型磷矿适用于窑法磷酸生产,研究结果对低品位混合型磷矿窑法工艺具有一定指导意义。

关键词: 窑法磷酸, 还原率, 低品位磷矿, 正交实验

Abstract:

Carbothermal reduction properties of low grade phosphate ore from Jinning,Yunnan were studied by kiln process.Four-factor and five-level orthogonal experiment was used to explore the influence of reaction temperature,reaction time,carbon excess coefficient,and Si/Ca ratio on the reduction rate of phosphate ore carbothermal reaction.The experimental re-sults showed that the order of factors influencing the phosphate ore reduction rate was as follows:Reaction temperature,carbon excess coefficient,reaction time,Si/Ca ratio.When the reaction temperature was 1 300 ℃,the carbon excess coefficient was 2.6,the reaction time was 1.5 h,and the ratio of n(Si)/n(Ca) was 1.5,the reduction rate could reach the highest value of 94.27%.Simultaneously,the applicability of Jinning,Yunnan low-grade mixed phosphate ore for kiln-process phosphoric acid production was evaluated,which showed that the mixed phosphate ore was suitable for kiln phosphoric acid production,and the research results had certain guiding significance for the low-grade mixed phosphate kiln process.

Key words: kiln process phosphoric acid, reduction rate, low grade phosphate ore, orthogonal experiment

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