ABSTRACT

Size reduction of oil shale is an essential process that allows the liberation of organic-rich constituents from inorganic portions to prepare the oil shale for further beneficiation processes. Grinding by conventional methods was impractical and led to technical and economic problems. In this study, the size reduction of the oil shale was conducted by attrition scrubbing process which seems to be an effective process for cleaning the kerogen surface and its disengagement from associated mineral matter. The statistical design was used to study the significance of soaking time, attrition time, and pH on the product in terms of kerogen and LOI contents. The results indicated that the attrition time is the most significant parameter as the wt% of −2.36 mm reaches about 75% after 120 min of attrition. The effect of pH is insignificant unless the ore has an appreciable amount of carbonate minerals. It is worth mentioning that the kerogen content was improved from 10% to 14% by attrition in acidic media. However, the fine fractions had a low-percentage of loss-on-ignition due to the presence of clay.

摘要

油页岩的尺寸减小是一个重要的过程，它允许从无机部分中释放出富含有机物的成分，以准备油页岩用于进一步的选矿过程。用传统方法研磨是不切实际的，并导致技术和经济问题。在这项研究中，油页岩的尺寸减小是通过磨损洗涤工艺进行的，这似乎是清洁干酪根表面及其与相关矿物质分离的有效工艺。采用统计设计研究浸泡时间、磨耗时间和产品pH值对干酪根和LOI含量的意义。结果表明，磨损时间是最重要的参数，因为 -2.36 mm 的 wt% 在磨损 120 分钟后达到约 75%。除非矿石中含有大量碳酸盐矿物，否则 pH 值的影响是微不足道的。值得一提的是，在酸性介质中，干酪根含量从 10% 提高到 14%。然而，由于粘土的存在，细部分的烧失量百分比很低。