Activation treatment method of oil shale distillation slag

Abstract

The invention relates to an activation treatment method of oil shale distillation slag, which mainly comprises the following four steps: oil shale crushing, dry distillation activation, acid leaching, and calcination treatment. The invention is characterized in that the step of dry distillation activation of oil shale is carried out twice, and inorganic components are fully activated and removed through temperature adjustment, so as to finally obtain acid leaching residue in which carbon and silica are main components. The invention has the advantages as follows: the dry distillation and the activation of the oil shale are carried out simultaneously, and removed ash residue has higher reactivity and doesn't need second activation treatment, so that the activation energy consumption is greatly reduced; part of organic matters in the oil shale is transformed into shale oil, and the rest components are all burned fully to be converted into heat energy, so that all the organic matters are fully used; the low-consumption preparation of shale oil from oil shale is realized, useful components such as aluminium iron and the like are extracted, and high-quality raw materials for preparing cement and silica from ash residue with silica are obtained.

Description

technical field [0001] The invention relates to an activation treatment method of oil shale retort residue, in particular to an activation treatment method of oil shale retort residue for separating components in oil shale by means of dry distillation, acid leaching and calcination. Background technique [0002] Oil shale is a low calorific value coal with an ash content greater than 40%. It is a non-renewable fossil energy like oil, natural gas and coal. my country is rich in oil shale resources, which are mainly used for dry distillation or direct combustion for power generation. A large amount of ash will be generated in the process, and unreasonable treatment will cause serious pollution. In recent years, the comprehensive utilization of oil shale ash has been given full attention, mainly for the production of building materials such as cement, ceramsite, bricks and chemical products. The inorganic components of my country's oil shale contain a large amount of SiO 2 、A...

AI Technical Summary

Problems solved by technology

[0003] The carbonization temperature of oil shale needs to be lower than 520 o C, while the temperature of combustion power generation is 850~1200 o C. The activity of oil shale ash generated in these two temperature ranges is very low, so it must be activated before preparing chemical products, which increases energy consumption and production costs

The activation of oil shale retort residue is generally at 600~700 o C calcination, the aluminosilicate in the oil shale undergoes a phase transition and transforms into a semi-crystalline substance with high activity. The combustion in the activation temperature range is insufficient and unstable, which affects the activation effect, and the combustible carbon in the slag is not fully utilized

The ash after oil shale combustion and power generation is burned at high temperature, and the inorganic components are transformed into more inert substances. Therefore, additives need to be added for activation and calcination, and the cost is higher than that of dry distillation ash