Method for preparing ultra-pure coal

A coal and sub-coal technology, applied in the field of coal chemical industry, can solve the problems of high residual alkali and difficulty in slurry filtration

Active Publication Date: 2022-01-14
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing ultra-pure coal in order to solve the problems of difficult slurry filtration and

Method used

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  • Method for preparing ultra-pure coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A method for preparing ultra-pure coal, the steps are as follows:

[0035] (1) Crushing the anthracite coal A to a particle size <6mm, and then roasting at 600°C for 15 minutes with nitrogen;

[0036] (2) Take 400g of roasted anthracite coal A (broken to a particle size <1mm) and 500g of sodium hydroxide, mix with 400ml of water, knead and react at 150°C for 0.5h, after cooling, add 1L of water to dilute, filter and wash 3 times, Obtaining a secondary coal filter cake with an alkali content of 0.78wt%;

[0037] (3) Add 10wt% dilute hydrochloric acid to the secondary coal filter cake according to the acid-coal ratio of 0.5:1, leach for 60min at 60°C, filter and wash and dry the filter cake to obtain ultra-pure coal with an ash content of 0.18wt%. As shown in table 2.

Embodiment 2

[0043] A method for preparing ultra-pure coal, the steps are as follows:

[0044] (1) Break the bituminous coal A to <3mm, and then roast it under nitrogen at 200°C for 12 hours;

[0045] (2) Take 100g of roasted bituminous coal A (broken to particle size <1mm), mix with 150g of potassium hydroxide and 850ml of water, stir and react at 120°C for 12h, filter after cooling, then add 1000ml of water to wash 3 times, and dry to obtain A secondary coal filter cake with an alkali content of 1.35wt%;

[0046] (3) Add 20wt% dilute sulfuric acid to the secondary coal filter cake according to the acid-coal ratio of 1:1, leach for 60min at 60°C, filter and wash the filter cake, and dry the filter cake to obtain ultra-pure coal with an ash content of 0.21wt%. As shown in table 2.

Embodiment 3

[0052] A method for preparing ultra-pure coal, the steps are as follows:

[0053] (1) Break the bituminous coal B to <1mm, and then roast it under nitrogen at 400°C for 2 hours;

[0054] (2) Take 100g of roasted bituminous coal B (broken to a particle size <1mm), mix it with 150g of sodium hydroxide and 850ml of water, stir and react at 250°C for 6h, filter after cooling, and then add 1000ml of water to wash 3 times to obtain the alkali content 5.13wt% secondary coal filter cake;

[0055] (3) Add 5wt% dilute nitric acid to the secondary coal filter cake according to the acid-coal ratio of 1:1, leach for 60min at 60°C, filter and wash the filter cake, and dry the filter cake to obtain ultra-pure coal with an ash content of 0.29wt%. As shown in table 2.

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Abstract

The invention relates to the field of coal chemical industry, in particular to a method for preparing ultra-pure coal. The method for preparing the ultra-pure coal comprises the following steps: (1) roasting coal in protective gas; (2) carrying out alkali treatment on the roasted coal to obtain secondary coal; and (3) adding acid into the secondary coal for leaching, and conducting washing and drying to obtain the ultra-pure coal. According to the method, the coal is roasted, so that organic volatile components in the coal can be effectively reduced, the situation that a filtering channel is blocked by colloidal particles is reduced when the coal is treated by a subsequent acid-alkali method, filtering and washing are facilitated, and the content of residual alkali in the secondary coal is greatly reduced. According to the method disclosed by the invention, the ash removal efficiency of the coal, especially the coal with low coalification degree, is improved, the ash content of the obtained ultra-pure coal is less than 0.3 wt%, the use amount of acid and alkali is reduced, and the pollution and comprehensive treatment cost are reduced.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to a method for preparing ultra-pure coal. Background technique [0002] China's coal reserves are large, but the types of coal are complex, the quality of the coal is generally poor, and the ash content is high. After years of mining, the quality of the coal has continued to decline. The ash content of commercial coal is relatively high, with an average ash content of 20-24%, while the average ash content of coal for power generation reaches more than 28%. The existing coal ash removal methods are mainly physical methods, such as jigging, flotation and gravity separation, but the ash removal efficiency is low, and generally only suitable for preliminary ash removal of raw coal, so that the ash removal can meet the standard of commercial coal. [0003] In order to further reduce the ash content and realize the clean, efficient and high-value utilization of coal, some efficient...

Claims

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Application Information

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IPC IPC(8): C10L9/08C10L9/02
CPCC10L9/08C10L9/02Y02E50/10
Inventor 赵利军李文华潘广宏梁文斌陈爱国靳凡
Owner CHNA ENERGY INVESTMENT CORP LTD
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