钾长石焙烧熟料中二氧化硅的溶出

Digestion of Silica from the Potash Feldspar Roasted Clinker

以钾长石碱焙烧熟料为原料,研究熟料中二氧化硅的溶出规律.考察了溶出过程中溶出温度、溶出时间、搅拌强度、熟料粒度和Na OH溶液浓度对Si O2溶出率的影响.利用扫描电镜（SEM）和X射线衍射（XRD）分析仪对熟料和碱溶渣的物相结构和微观形貌进行了表征并分析了溶出过程.通过试验得到适合的溶出条件为：溶出温度95℃、溶出时间80 min、搅拌强度400 r/min、熟料粒度74~89μm、Na OH溶液浓度0.2 mol/L.在此条件下,Si O2溶出率可达到99%.溶出后Na2Si O3进入溶液,K和Al在渣中富集,得到分离.

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 80 min , stirring intensity 400 r/min, clinker granularity 74 ~ 89 μm and NaOH concentration 0.2 mol/L. Under the conditions, the digestion efficiency of SiO2 is up to 99%. Na2 SiO3 is joined into solution and K, Al are enriched in residue through digestion, and then they are separated.