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 ›› 2012, Vol. 44 ›› Issue (4): 22-.

• 论文 • 上一篇    下一篇

白云石制备高纯氧化镁的工艺研究

张 华1,聂鹏飞2,徐春和1,徐旺生1   

  1. 1.武汉工程大学化工与制药学院,绿色化工过程省部共建教育部重点实验室,湖北武汉 430073;
    2.云南磷化集团科工贸有限公司
  • 发布日期:2012-04-06

Preparation of high purity magnesium oxide from dolomite

Zhang Hua1,Nie Pengfei2,Xu Chunhe1,Xu Wangsheng1   

  1. 1.Key Laboratory for Green Chemical Process of Ministry of Education,School of Chemical Engneering and Pharmacy,
    Wuhan Institute of Technology,Wuhan 430073,China;2.Yunnan Phosphate Chemical Group Industry and Trade Co.,Ltd.
  • Published:2012-04-06

摘要: 以白云石为原料,通过煅烧、消化、硫酸酸浸、过滤得硫酸镁溶液,采用氨水沉淀法制备氢氧化镁中间体,经煅烧得高纯氧化镁。研究了加入硫酸后白云石灰乳终点pH、反应温度、硫酸镁浓度和煅烧温度对镁的浸出率、沉淀率以及产品氧化镁纯度的影响,最终确定最佳工艺条件为:灰乳终点pH为6,反应温度为40 ℃,硫酸镁浓度为0.8 mol/L,煅烧温度为900 ℃。在此条件下制备的氧化镁纯度达到99.0%以上,满足高纯氧化镁的要求。

关键词: 白云石, 氢氧化镁, 高纯氧化镁

Abstract: Magnesium sulfate solution can be obtained from dolomite via the processes of calcination,digestion,acid leaching,and filtration.Using NH3·H2O as precipitating agent,Mg(OH)2  intermediate can be obtained and the high purity magnesium oxide was prepared through calcination.Impacts of end-point pH of dolomite slurry,reaction temperature,concentration of MgSO4 ,and calcination temperature on the leaching and sedimentation rate of magnesium and on the purity of magnesium oxide were investigated,and the optimum processing conditions were obtained as follows:end-point pH of dolomite slurry was 6,reaction temperature was 40 ℃,concentration of MgSO4 was 0.8 mol/L,and calcination temperature was 900 ℃.Under above conditions,the purity of magnesium oxide reached over 99.0%,which met the demand for high purity magnesium oxide.

Key words: dolomite, magnesium hydroxide, high purity magnesium oxide

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