Journal of Northeastern University Natural Science ›› 2016, Vol. 37 ›› Issue (3): 363-367.DOI: 10.12068/j.issn.1005-3026.2016.03.013

• Materials & Metallurgy • Previous Articles     Next Articles

Digestion of Silica from the Potash Feldspar Roasted Clinker

LIU Jia-nan1, SHEN Xiao-yi1, ZHANG Jun1, ZHAI Yu-chun1,2   

  1. 1.School of Metallurgy, Northeastern University, Shenyang 110819, China; 2. Northeastern University at Qinhuangdao, Qinhuangdao 066004, China.
  • Received:2014-12-29 Revised:2014-12-29 Online:2016-03-15 Published:2016-03-07
  • Contact: ZHAI Yu-chun
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Abstract: The digestion of silica in roasted clinker of potash feldspar with Na2CO3 was studied. The influences of digestion temperature, digestion time, stirring intensity, clinker granularity and NaOH concentration on the digestion efficiency of SiO2 were analyzed. The mineralogical structure and microstructures of roasted clinker and residue by digestion were characterized and the process of digestion was analyzed by scanning electron microscope (SEM) and X-ray diffraction (XRD) analyzer. The appropriate digestion conditions were concluded as follows: digestion temperature 95℃, digestion time 80min , stirring intensity 400r/min, clinker granularity 74~89μm and NaOH concentration 0.2mol/L. Under the conditions, the digestion efficiency of SiO2 is up to 99%. Na2SiO3 is joined into solution and K, Al are enriched in residue through digestion, and then they are separated.

Key words: potash feldspar, clinker, silica, digestion, the appropriate conditions

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