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Method for improving whiteness of oil shale semicoke through acid etching and aerobic calcination

A technology for oil shale semi-coke and calcination, which is applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problem of lack of research reports and application precedents, which restricts the high-value utilization of oil shale semi-coke and affects product quality and other problems, to achieve the effect of mild reaction conditions, easy control of the process, and no discharge of three wastes

Active Publication Date: 2020-05-08
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the darker color of oil shale semi-coke, which directly affects the quality of the final product, the current use of oil shale semi-coke is limited to low-end applications such as roadbed fillers and fertilizer fillers. In functional fillers, reinforcing materials, pigments, etc. , hybrid antibacterial agents, adsorption materials and other fields are mostly blank
Therefore, how to turn black oil shale semi-coke into white and realize the application of oil shale semi-coke products in the field of functional materials has become one of the key technical problems restricting the high-value utilization of oil shale semi-coke. The focus of attention in the industry, but there are still no relevant research reports and application precedents

Method used

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  • Method for improving whiteness of oil shale semicoke through acid etching and aerobic calcination
  • Method for improving whiteness of oil shale semicoke through acid etching and aerobic calcination

Examples

Experimental program
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Effect test

Embodiment 1

[0012] Weigh 60g of oil shale semi-coke powder, disperse into 300ml, 0.5mol / L hydrochloric acid solution, react at 60°C for 12h, centrifuge, wash with deionized water 5 times, press filter to obtain solid product, and control The moisture content of the solid product is 35%; the solid product is pressed into a thin sheet with a thickness of 0.5mm by using a double-roll machine for 3 times, and then calcined at 900°C for 2 hours in an air atmosphere to obtain an oil shale semi-coke-turned-white product , grind and sieve the whitening product, and mark it as BJZB-1, and its L*, a*, b* color parameters are shown in Table 1.

Embodiment 2

[0015] Weigh 60g of oil shale semi-coke powder, disperse into 1200ml, 2.0mol / L sulfuric acid solution, react at 60°C for 10h, centrifuge, wash with deionized water 5 times, press filter to obtain solid product, and control The moisture content of the solid product is 30%; the solid product is pressed into a sheet with a thickness of 1 mm by using a pair of rollers once, and then calcined at 1100 °C for 1 h in an air atmosphere to obtain the oil shale semi-coke turned white The product, the whitening product is ground and sieved, marked as BJZB-2, and its L*, a*, b* color parameters are shown in Table 1.

[0016] Comparative example: Weigh 60g of oil shale semi-coke powder and calcinate it at 1000°C for 2 hours in the air atmosphere to obtain a calcined sample of oil shale semi-coke, grind and sieve the calcined sample, and mark it as BJ-1000, its L *, a*, b* color parameters are shown in Table 1.

Embodiment 3

[0018] Weigh 60g of oil shale semi-coke powder, disperse into 600ml, 2mol / L hydrochloric acid solution, react at 90°C for 12h, centrifuge, wash with deionized water 5 times, press filter to obtain solid product, and control the solid product after press filtration The water content of the product is 33%; the solid product is pressed twice into a thin sheet with a thickness of 0.5mm by using a double-roller machine, and then calcined at 1000°C for 2 hours in an air atmosphere to obtain the oil shale semi-coke-turned-white product. The whitened product is ground and sieved, and 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 whitening oil shale semicoke, wherein the method comprises the steps: crushing the oil shale semicoke, uniformly dispersing into an acid solution, carrying out a reaction at the temperature of 60-90 DEG C for 2-12 h, centrifuging, washing, and carrying out filter pressing to obtain a solid product; and pressing the solid product into a sheet with the thicknessof 0.5-1 mm by using a double-roller machine, and calcining for 1-4 h at the temperature of 600-1100 DEG C in an air atmosphere to obtain an oil shale semicoke whitening product. According to the method, a two-step method combining acid etching and aerobic calcination is adopted, so that organic matters and coloring metal ions in the oil shale semicoke are effectively removed, the black oil shalesemicoke is converted into white, and the high-valued application of the oil shale semicoke in the field of functional materials is expanded. In addition, the whitening process is simple in step, mildin reaction condition, high in operability, easy in process control and low in energy consumption. The acid solution in the process can be recycled, no three wastes are discharged, and the whole process is easy to industrialize.

Description

technical field [0001] The invention relates to a method for improving the whiteness of oil shale semi-coke, in particular to a method for improving the whiteness of oil shale semi-coke through acid etching and aerobic calcination, which belongs to the technology of solid waste resource utilization and deep processing high-value utilization field. Background technique [0002] my country is rich in oil shale reserves, second only to the United States, Brazil, Russia and other countries. Shale oil can be extracted from oil shale through low-temperature dry distillation (500-800°C), and the solid waste obtained is called semi-coke. Semi-coke contains a lot of minerals such as kaolinite, mica and pyrite. At present, semi-coke is stored as solid waste. With the increase of the stockpile, the occupied land area is getting larger and larger, causing damage to the ecological environment, and the leachate produced by rainwater leaching will cause harm to the quality of soil and gr...

Claims

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Application Information

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IPC IPC(8): C01B33/40
CPCC01B33/40C01P2006/62C01P2006/63C01P2006/64
Inventor 王爱勤许江牟斌宗莉朱永峰康玉茹惠爱平杨芳芳
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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