Oil shale mineral separation method

Abstract

The invention provides an oil shale mineral separation method and belongs to the field of oil shale industries. The oil shale mineral separation method is particularly applicable to the oil shale processing and utilization industry, and comprises the following steps: screening oil shale ores of which the grain sizes range between 0-300 mm; crushing oversize products (the grain sizes are larger than 50-80 mm), mixing the crushed oversize products with undersize products (the grain sizes are smaller than 50-80 mm), and adding water into the mixture for classification, so as to obtain fine-grain products (the grain sizes range between 1-4 mm) and coarse-grain products (the grain sizes are larger than 1-4 mm); performing separation and dehydration on the fine-grain products to obtain a fine concentrate product and a fine tailing product; performing three-product separation on the coarse-grain products to obtain waste rock, a middling product and concentrate; and performing further separation and dehydration on the concentrate to obtain a final coarse-grain concentrate product and a lump concentrate product, wherein water drained in all the dehydration steps is subjected to concentration and clarification, a muddy ore product is obtained through filter-pressing of a precipitate, and clarified water and a filtrate are utilized as circulating water. According to the oil shale mineral separation method provided by the invention, water is added for classification after oil shale is crushed, and separation of the coarse-grain products and that of the fine-grain products are performed, thereby solving the problem that in the prior art, the separation efficiency is low, effectively improving the concentrate yield of oil shale, and achieving a higher economic value.

Description

technical field [0001] The invention belongs to the field of oil shale industry, and in particular is an oil shale beneficiation method suitable for the oil shale processing and utilization industry. Background technique [0002] Oil shale belongs to unconventional oil and gas resources. It is listed as a very important alternative energy source in the 21st century due to its rich resources and feasibility of development and utilization. It is a non-renewable fossil energy like oil, natural gas and coal. Shale oil can be obtained by low-temperature dry distillation of oil shale. Shale oil is similar to crude oil and can be made into gasoline, diesel or as fuel oil. In the era of high oil prices, the development and utilization of oil shale in relevant countries became active. China has abundant reserves of oil shale resources, and a large amount of oil shale is also produced in the process of coal mining. The development and utilization of oil shale can not only alleviate t...

AI Technical Summary

Problems solved by technology

The Publication No. CN104194814A published by the State Intellectual Property Office of China on September 19, 2014 is a kind of oil shale pre-selection gangue removal-retort process, which discloses a simple two-product jigging separation method for oil shale. However, a large number of industrial experiments in practice have proved that this method cannot effectively sort oil shale, and in most cases there is no sorting effect, because the specific gravity of oil shale is very close to the specific gravity of rock, and the specific gravity of the separation is 2.5 grams / centimeter 3 Above, the conventional jigging coal separation technology cannot be used, and the oil shale separation industry has no jigging separation process implementation precedent. Therefore, how to improve the effect of the oil shale jigging separation process has become an industry problem. Through a large number of experiments, the present invention proposes A new method of combined sorting with the last piece separated and two-way two-technology

Images