含钾砂页岩除铁提质及陶瓷应用试验研究

分析了含钾砂页岩中铁的赋存状态,开展含钾岩石除铁提质试验,并对除铁粉料应用于陶瓷原料进行试验研究。结果表明,采用磁选-酸浸工艺,在磨矿细度为-74 μm占50%(质量分数),磁场强度为190 mT,盐酸浓度为20%(质量分数),浸出温度为90 ℃的最佳条件下,除铁粉料中全铁含量可降低为0.13%(质量分数),K₂O和Na₂O总含量提高至11.00%(质量分数),含量符合陶瓷用钾长石Ⅰ级品要求。除铁粉料在陶瓷胚体成型试验中易于成型,烧成温度范围宽,成品率高,可替代长石作为陶瓷原料使用,开拓了含钾砂页岩作为陶瓷原料使用的新方向。

Experimental Study on Iron Removal Purification of Potassium Bearing Sand Shale and Its Application of Ceramics

Based on the analysis of the occurrence state of iron in potassium bearing rock, the experiment of iron removal purification of potassium bearing sand shale was carried out, and the application of iron removal powder in ceramic raw materials was studied. The results show that, under the optimum conditions that the grinding fineness (-74 μm) is 50% (mass fraction), the magnetic field strength is 190 mT, the hydrochloric acid concentration is 20% (mass fraction), the leaching temperature is 90 ℃, the total iron content in iron removal powder can be reduced to 0.13% (mass fraction), and the total content of K₂O and Na₂O increases to 11.00% (mass fraction) which meets the requirements of grade I potassium feldspar for ceramics. The iron removal powder is easy to be formed in the forming test of ceramic embryo, with wide firing temperature range and high yield, It can be used as ceramic raw material instead of feldspar. A new direction of using potassium bearing sand shale as raw materials of ceramics has been developed.