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Method for converting black oil shale semi-coke into white product

A semi-coke and black technology of oil shale, which is applied in the field of comprehensive utilization of solid waste resources and high-value utilization of deep processing, can solve problems such as environmental pollution and waste of resources, and achieve good product dispersion, simple process, and simple preparation process Effect

Active Publication Date: 2019-11-05
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stacking of semi-coke not only causes waste of resources, but also causes environmental pollution. It is urgent to develop a new process for efficient utilization of semi-coke from the perspective of mineralogy and materials science.

Method used

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  • Method for converting black oil shale semi-coke into white product
  • Method for converting black oil shale semi-coke into white product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 6 kg of oil shale semi-coke powder, spray 0.6 kg of water into it evenly, mix well, press it into a thin slice with a thickness of 1 mm with a pair of rollers, and then calcinate at 300°C for 4 hours in an air atmosphere to obtain a solid Product A;

[0020] Weigh 5 kg of solid product A and evenly disperse it into 50 kg of hydrogen peroxide solution with a mass concentration of 30%, adjust the pH value of the solution to 6 with sulfuric acid, and then react for 2 hours under stirring at 50°C; centrifuge the reacted suspension to obtain a solid product B;

[0021] Disperse the solid product B into 50 kg of 1mol / L oxalic acid solution, and react for 2 hours under stirring at 80°C to obtain the acid-washed solid product C;

[0022] The acid-washed solid product C was calcined at 500°C for 2 hours to obtain a semi-coke-turned-white product, marked as BJZB-1, and its L*, a*, b* color parameters are shown in Table 1.

Embodiment 2

[0024] Weigh 6 kg of oil shale semi-coke powder, spray 1.2 kg of water evenly into it, mix well, press it into a thin slice with a thickness of 2 mm with a pair of rollers, and then calcinate at 600°C in air for 2 hours to obtain Solid product A;

[0025] Weigh 5 kg of solid product A and evenly disperse it into 100 kg of hydrogen peroxide solution with a mass concentration of 5%, adjust the pH value of the solution to 3 with sulfuric acid, and then react at 90°C for 1 h; centrifuge the reacted suspension to obtain a solid Product B; redisperse the solid product B into 50 kg of 4 mol / L sulfuric acid solution, and react for 1 hour under stirring at 70°C to obtain the acid-washed solid product C;

[0026] Finally, the acid-washed solid product C was calcined at 900°C for 2 hours to obtain a semi-coke-turned-white product, marked as BJZB-2, and its L*, a*, b* color parameters are shown in Table 1.

Embodiment 3

[0028] Weigh 6 kg of oil shale semi-coke powder, spray 1 kg of water evenly into it, mix thoroughly, press it into thin slices with a thickness of 1.5 mm with a pair of rollers, and then calcinate at 400 °C for 2 hours in air atmosphere to obtain Solid product A;

[0029] Weigh 5 kg of solid product A and evenly disperse it into 60 kg of hydrogen peroxide solution with a mass concentration of 10%, adjust the pH value of the solution to 4 with sulfuric acid, and then react at 70°C for 2 h with stirring; centrifuge the reacted suspension to obtain solid product B;

[0030] The solid product B was redispersed into 100 kg of 2mol / L nitric acid solution, and reacted under stirring at 80°C for 1.5 h to obtain the acid-washed solid product C;

[0031] Finally, the acid-washed solid product C was calcined at 600°C for 2 hours to obtain a semi-coke-turned-white product, marked as BJZB-3, and its L*, a*, b* color parameters are shown in Table 1.

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Abstract

The invention discloses a method for converting black oil shale semi-coke into a white product. The method comprises the following steps of crushing oil shale semi-coke into powder, adding water, pressing into slices by using a roller press, and carrying out calcination in an air to obtain a solid product A; dispersing the solid product A in a hydrogen peroxide solution, adjusting the pH of the solution to be 3-6, and carrying out reaction at 50-90 DEG C for 1-2 hours; centrifuging reacted suspension to obtain a solid product B; dispersing the solid product B into an acid solution, carrying out stirring reaction at 80 DEG C for 1-2 hours, and carrying out centrifugal separation to obtain an acid pickling product C; and finally, carrying out calcination on the acid pickling product at 500-900 DEG C for 2 hours to obtain the oil shale semi-coke whitening product. According to the method, by virtue of an integrated process of rolling- calcinations-oxidization- pickling- re-calcination, black organic matters in the oil shale semi-coke are removed, and associated substances such as carbonate and iron pyrite are removed, so that the black oil shale semi-coke is converted into the white product, and the high-value application and application field of the semi-coke are expanded.

Description

technical field [0001] The invention relates to a method for turning black oil shale semi-coke into white, and belongs to the technical field of comprehensive utilization of solid waste resources and high-value utilization of deep processing. Background technique [0002] Oil shale is a kind of sedimentary rock with high ash content and combustible organic matter. Its appearance is mostly brown mudstone, its relative density is 1.4~2.7, and its main components are kerogen, water and minerals. Oil shale is often mined together with coal to form associated deposits, and is widely used in many fields such as refining shale oil, power generation, fuel, manufacturing cement, fertilizer and building materials. [0003] Shale oil can be extracted from oil shale through low-temperature dry distillation (about 600°C), and the shale oil can be refined by hydrocracking to obtain various chemical products such as gasoline, kerosene, diesel oil, paraffin, and petroleum tar. A large numb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
CPCB09B3/80B09B3/40
Inventor 王爱勤许江王文波牟斌袁崇亮康玉茹王露梅朱永峰
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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