| 摘要 |
The invention relates to a process for removing mineral impurities from coal and oil shales, comprising:… a step of crushing said coal or shale to a particle;… a step of leaching the crushed coal or shales with HF solution;… steps of separating the leach liquor containing dissolved mineral salts and fluorosilicic acid from the coal or shales, and washing the coal or shale with water;… a step of leaching the washed coal or shale with HCl solution:… steps of separating the leach liquor containing dissolved mineral salts from the coal or shale and washing the coal or shale with water;… a step of heating the coal or shale under a vacuum in order to remove residual impurities including HF, HCl and SiF4 impurities and so on. |
