油页岩在干馏前用重介质旋流器除去占原矿70%的脉石;油页岩中的油份有70%得到回收。 Roberts及Schaefer资源公司在其伊利诺斯州的生产规模的实验厂中成功地证明了油页岩在地上干馏前进行富集的实用性。在油页岩工业能源的总生产能力上,这是一项重要的步骤。与常规方法相比,这种方法能节省大量的费用。该公司与Cathedral Bluffs页岩油公司合作,完成了对第一套实验装置(使用Dutch State Mines重介质旋流器)的试验。该方法的关键之一是旋流器内产生很大的离心力,从 Oil shale is removed by heavy media cyclones prior to carbonization, which make up 70% of the ore gangue; 70% of the oil in the oil shale is recovered. Roberts and Schaefer Resources have successfully demonstrated the usefulness of oil shale enrichment prior to carbonization on the ground in its pilot production facility in Illinois. This is an important step in the total production capacity of oil shale industrial energy. Compared with the conventional method, this method can save a lot of costs. The company, in collaboration with Cathedral Bluffs Shale Oil Company, completed the first experiment with a Dutch State Mines HM cyclone. One of the keys to this method is the great centrifugal force generated within the cyclone