Oil shale tailings beneficiation process

Abstract

The invention relates to an oil shale tailings beneficiation process and belongs to the oil shale industrial field. The oil shale tailings beneficiation process is especially suitable for the oil shale tailings processing utilization industry. The process includes the following steps that: water is added in oil shale raw ores, and the oil shale raw ores are subjected to 10-to-13mm screening, and plus-sieve products which are larger than 10 to 13 mm are crushed and are mixed with minus-sieve products which are smaller than 10 to 13 mm, the crushed plus-sieve products and the minus-sieve product are subjected to separation through adopting a hydrocyclone, underflow products are dehydrated through a high-frequency screen, so that gangue products can be obtained, and overflow products are dehydrated through the high-frequency screen and granulated so as to form nubbly concentrate products, all slime water generated by all the products that pass through the high-frequency screen is thickened and clarified, and precipitates are subjected to filter pressing, so that tailings products can be obtained; and clarified water and filtered liquid can be adopted as circulating water. According to the oil shale tailings beneficiation process, after being crushed, the oil shale tailings are subjected to separation through adopting the hydrocyclone, and therefore, the oil shale tailings beneficiation process is simple, efficient and economical, and has a higher economic value. With the oil shale tailings beneficiation process adopted, problems of complex production process, high production investment and low separation efficiency can be solved, and the concentrate yield of oil shale can be effectively improved.

Description

technical field [0001] The invention belongs to the field of oil shale industry, and is especially suitable for the processing and utilization industry of oil shale end ore, and is used for removing inorganic minerals in oil shale end ore, obtaining higher concentrate yield, and generating greater economic benefits . 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 sha...

AI Technical Summary

Problems solved by technology

This method makes a large amount of gangue remain in the oil shale raw ore, which is unfavorable for subsequent transformation

The Publication No. CN104194814A published by the State Intellectual Property Office of China on September 19, 2014 discloses a simple two-product jigging separation method, but in practice After a large number of industrial experiments, it is proved that this method cannot effectively sort oil shale. In practice, there is no sorting effect in most cases. 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 g / centimeter 3 Above, conventional jigging coal preparation technology cannot be used

This process is aimed at pre-discharging coarse-grained (>10mm) oil shale, but the pre-discharging process for oil shale powder is still a blank field. Therefore, how to separate oil shale powder and achieve good separation results , has become a difficult problem in the industry. Through a large number of experiments, the present invention proposes a new process for water-based separation of oil shale powder

Images