东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2013, Vol. 34 ›› Issue (4): 551-555.DOI: -

• 材料与冶金 • 上一篇    下一篇

石灰对三水铝石型铝土矿低温溶出行为的影响

潘晓林，于海燕，涂赣峰，毕诗文   

  1. (东北大学材料与冶金学院，辽宁沈阳110819)
  • 收稿日期:2012-10-08 修回日期:2012-10-08 出版日期:2013-04-15 发布日期:2013-06-19
  • 通讯作者: 潘晓林
  • 作者简介:潘晓林(1981-)，男，山东平度人，东北大学讲师，博士；涂赣峰(1964-)，男，江西萍乡人，东北大学教授，博士生导师；毕诗文(1940-)，男，山东荣成人，东北大学教授，博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(51104041).

Effect of Lime on Digestion of Gibbsitic Bauxites at Low Temperature

PAN Xiaolin， YU Haiyan， TU Ganfeng， BI Shiwen   

  1. School of Materials ＆ Metallurgy， Northeastern University， Shenyang 110819， China.
  • Received:2012-10-08 Revised:2012-10-08 Online:2013-04-15 Published:2013-06-19
  • Contact: PAN Xiaolin
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摘要： 研究了不同石灰添加量对3种国外三水铝石型铝土矿在145℃时溶出性能的影响规律及其作用机理.国外三水铝石型铝土矿主要由三水铝石、针铁矿、赤铁矿、高岭石和石英等组成，并含有一定的锐钛矿和一水软铝石.研究结果表明，添加石灰能够促进脱硅反应的进行，降低溶出后铝酸钠溶液中二氧化硅的质量浓度，随着石灰质量分数的增加，溶液的硅量指数逐渐提高；添加石灰降低三水铝石型铝土矿的氧化铝溶出率，其与石灰的质量分数呈线性递减关系；石灰促进脱硅产物由水合铝硅酸钠向水化石榴石转变，随着石灰质量分数的增加，溶出液中的苛碱质量浓度逐渐提高，赤泥中碱的质量分数逐渐降低.

关键词: 三水铝石, 铝酸钠溶液, 溶出, 脱硅, 石灰

Abstract: The effects and function mechanism of the different amount of lime additions on the digestion properties of three kinds of gibbsitic bauxites obtained from abroad were investigated at 145℃. All the gibbsitic bauxites are comprised of gibbsite， aluminogoethite， hematite， kaolin， quartz as well as minor anatase and boehmite characterized by XRD. The results showed that the lime addition promoted the desilication reactions， which decreased the concentrations of alumina and silica of digested sodium aluminate liquor. The corresponding silica index increased gradually and the alumina digestion rates of gibbsitic bauxites decreased linearly with the increase of the mass fraction of the lime. The conversion of desilication products from sodium silicon aluminum hydrate to hydrogarnet was also promoted by the addition of lime. The concentration of caustic alkali increased and the mass fraction of the alkali in the red mud decreased gradually with the increase of the mass fraction of the lime.

Key words: gibbsite, sodium aluminate liquor, digestion, desilication, lime

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