Process for full-particle-size sorting and enriching kerogen from oil shale

Abstract

The invention relates to a process for full-particle-size sorting and enriching kerogen from oil shale. The process comprises the following steps: crushing oil shale raw ores till the particle size is less than 50-80mm; sieving and grading the crushed product by using a 0.5mm sieve; carrying out gravity separation on +0.5mm oversize material to obtain massive kerogen-enriched products and massive low-kerogen products; recovering magnetic separation media from undersize material; carrying out floating separation on tailings generated after recovery of magnetic separation media and sieved -0.5mm undersize material, wherein fine particle kerogen-enriched products are obtained after floating foam products generated by floating separation are filtered and dehydrated; concentrating and dehydrating the tailings obtained after floating separation to produce fine-particle low-kerogen products, wherein the filtered and dehydrated filtrate and concentrated and dehydrated overflow become circulating water. By sorting full-particle-size oil shale, kerogen in massive and fine-particle oil shale is effectively enriched, so that the oil yield of the massive oil shale and the combustion heat value of the fine-particle oil shale are improved and the problem of environmental pollution is effectively reduced. The process is simple in process and wide in practicality.

Description

technical field [0001] The invention belongs to the field of oil shale industry, and is especially suitable for the oil shale full-grain fraction separation and enrichment kerogen process, which is used to remove some minerals in the oil shale and increase the content of kerogen in the oil shale full-grain fraction. Background technique [0002] Oil shale is an unconventional oil and gas resource. my country's oil shale resource reserves are very rich, and the reserves converted into shale oil geological resource reserves are 47.6 billion tons, ranking among the top in the world. Oil shale is mainly used for power generation and oil refining, and is an important supplementary or alternative energy source to oil. Oil shale is composed of organic components, inorganic minerals and water. The organic component is kerogen, which usually accounts for less than 35% of the total mass. Shale oil can be obtained by low-temperature dry distillation of kerogen at about 500 °C, and furt...

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Problems solved by technology

However, the inorganic minerals with a content of more than 40% in oil shale play a harmful role in the utilization process such as dry distillation or combustion, which greatly reduces the purity and conversion utilization rate of oil shale reaction products, and reduces the oil shale due to the large ash content. The calorific value of direct combustion of shale, and it is easy to produce serious dust and acid gas, which brings environmental pollution and affects the economic and social benefits of oil shale processing.

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