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Method for oxidizing Shengli lignite with alkali-oxygen at low temperature

A Shengli lignite and low-temperature technology, applied in the field of coal chemical industry, can solve the problems of application restrictions, production, storage, utilization, transportation restrictions, etc., and achieve the effect of reducing spontaneous combustion tendency, significant economic and social benefits, and improving safety

Active Publication Date: 2017-01-04
INNER MONGOLIA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

In particular, the production, storage, utilization, and transportation of Shengli lignite are greatly restricted due to its high spontaneous combustion index such as high water content, high volatile matter, and high oxygen content. Therefore, the prerequisite for its full utilization is to make It can be stored for a long time and transported over a long distance, so its application is greatly limited

Method used

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  • Method for oxidizing Shengli lignite with alkali-oxygen at low temperature
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  • Method for oxidizing Shengli lignite with alkali-oxygen at low temperature

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Effect test

Embodiment 1

[0022] A method for alkali-oxygen low-temperature oxidation of Shengli lignite, prepared by the following steps:

[0023] 1) Grinding coal to 80-100 mesh, drying at 105°C for 4 hours to obtain coal powder;

[0024] 2) Add coal powder and 0.5mol / L NaOH solution into the autoclave, seal the autoclave, pass oxygen to 0.6MPa, raise the temperature from room temperature to 150°C at a speed of 300r / min, and keep the temperature at the final temperature for 1h. After cooling to room temperature, the sample was obtained;

[0025] 3) Suction filter the sample, wash the filter residue with distilled water until pH = 8, and then dry it at 105°C for 4 hours to obtain 150°C alkali-oxygen low-temperature oxidation Shengli lignite, which is designated as SL-150.

[0026] The coal is the Shengli lignite from the Xilingol area of ​​Inner Mongolia.

[0027] The mass ratio of the coal powder and NaOH solution is 1:4.

[0028] The heating time is 1h.

Embodiment 2

[0030] A method for alkali-oxygen low-temperature oxidation of Shengli lignite, prepared by the following steps:

[0031] 1) Grinding coal to 80-100 mesh, drying at 105°C for 4 hours to obtain coal powder;

[0032] 2) Put coal powder and 0.5mol / L NaOH solution into the autoclave, seal the autoclave, pass oxygen to 0.6MPa, raise the temperature from room temperature to 200°C at a speed of 300r / min, and keep the temperature at the final temperature for 1h. After cooling to room temperature, the sample was obtained;

[0033] 3) The sample was suction-filtered, and the filter residue was washed with distilled water until pH = 8, and then dried at 105°C for 4 hours to obtain 200°C alkali-oxygen low-temperature oxidation Shengli lignite, which was designated as SL-200.

[0034] The coal is the Shengli lignite from the Xilingol area of ​​Inner Mongolia.

[0035] The mass ratio of the coal powder and NaOH solution is 1:5.

[0036] The heating time is 1h.

Embodiment 3

[0038] A method for alkali-oxygen low-temperature oxidation of Shengli lignite, prepared by the following steps:

[0039] 1) Grinding coal to 80-100 mesh, drying at 105°C for 4 hours to obtain coal powder;

[0040] 2) Add coal powder and 0.5mol / L NaOH solution into the autoclave, seal the autoclave, pass oxygen to 0.6MPa, raise the temperature from room temperature to 250°C at a speed of 300r / min, and keep the temperature at the final temperature for 1h. After cooling to room temperature, the sample was obtained;

[0041] 3) The sample was suction-filtered, and the filter residue was washed with distilled water until pH = 8, and then dried at 105°C for 4 hours to obtain 250°C alkali-oxygen low-temperature oxidation Shengli lignite, which was designated as SL-250.

[0042] The coal is the Shengli lignite from the Xilingol area of ​​Inner Mongolia.

[0043] The mass ratio of the coal powder and NaOH solution is 1:5.

[0044] The heating time is 1h.

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Abstract

The invention discloses a method for oxidizing Shengli lignite with alkali-oxygen at a low temperature. The method comprises the following steps: grinding coal, and drying at 105 DEG C for 4 hours to obtain pulverized coal; respectively adding the pulverized coal and a NaOH solution into a high-pressure reactor, sealing the high-pressure reactor, introducing oxygen to 0.6MPa, and heating to 150-300 DEG C from room temperature at a rotating speed of 300r / min, keeping constant temperature for 1 hour at the final temperature, and cooling to room temperature to obtain a sample; and pumping and filtering the sample, washing filter residues with distilled water until the pH is 8, and drying at 105 DEG C for 4 hours to obtain alkali-oxygen low-temperature oxidized Shengli lignite at different temperatures. According to the method, the combustion performance of Shengli lignite is remarkably changed, the spontaneous combustion tendency of the Shengli lignite which is treated by the method is remarkably reduced, and the alkali-oxygen oxidized coal sample at 150-200 DEG C especially has a remarkable effect, so that the safety of coal in storage and transportation process can be greatly improved. The method has remarkable economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a method for alkali oxygen low-temperature oxidation of Shengli lignite. Background technique [0002] Coal is the main energy source in China. Its efficient and clean utilization can not only reduce environmental pollution, but more importantly, it has become a resource and an important chemical raw material. Inner Mongolia is one of the large-scale coal production provinces in my country, its output is second only to Shanxi, and its coal reserves rank second in the country. [0003] Lignite is the coal type with the largest reserves in Inner Mongolia's coal resources. The Shengli Coal Field is the largest lignite coal field in the Xilin Gol area of ​​Inner Mongolia, with reserves of 24.2 billion tons of lignite. Spontaneous combustion of lignite is because lignite can absorb oxygen in the air at room temperature and generate heat through oxidation re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L5/04C10L10/00
CPCC10L5/04C10L10/00C10L2290/08C10L2290/28
Inventor 何润霞刘全生王斌王丹丹智科端宋银敏陈家明
Owner INNER MONGOLIA UNIV OF TECH
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