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Process for preparing ultra-pure coal by using acid-alkali method

A technology of acid-alkali method and process, which is applied in the field of preparing ultra-pure coal by acid-alkali method, and can solve the problems of inability to obtain ultra-pure coal and high process conditions

Inactive Publication Date: 2021-04-16
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Only low ash coal can be obtained by this process, and ultra-pure coal cannot be obtained, and the process conditions are relatively high, such as the temperature must reach 200°C

Method used

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  • Process for preparing ultra-pure coal by using acid-alkali method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A process for preparing ultra-pure coal by an acid-base method, comprising the following steps:

[0026] (1) Prepare experimental instruments and medicines

[0027] Instruments: electric magnetic stirrer, circulating water vacuum pump, 101 type electric blast drying oven, muffle furnace, analytical balance, small electromagnetic pulverizer;

[0028] Agent: aviation kerosene (dispersant), 20wt% NaOH solution, 49wt% sulfuric acid solution, 25wt% dilute hydrochloric acid solution, 12wt% sodium carbonate solution, CaO, 15wt% ZnCl solution;

[0029] (2) Prepare coal samples

[0030] Prepare the single coal JM2 and FM2 in the coking plant, the ash content is 9.08%, 9.83%, respectively. The experimental coal samples were pulverized by a small electromagnetic pulverizer and passed through a 200-mesh sieve.

[0031] (3) Preparation of ultra-pure coal

[0032] as attached figure 1 As shown, the ultrapure coal was prepared according to the following procedure.

[0033] A. Al...

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Abstract

The invention relates to a process for preparing ultra-pure coal by using an acid-alkali method, which comprises the following steps of: crushing clean coal to pass through a 200-mesh sieve; carrying out alkali washing, acid washing, salt washing, secondary acid washing and flotation, and carrying out suction filtration and drying to obtain the ultra-pure coal with the coal ash content of less than 0.6%. Compared with the prior art, the method has the beneficial effects that under the conditions of normal pressure and low temperature (below 100 DEG C), strong acid is not used, and the acid-base method is used for preparing the ultra-pure coal. The conditions required by the process are relatively mild; high-temperature, high-pressure, strong-acid and strong-alkali process conditions are not required; the ultra-pure coal with very low ash content can be obtained.

Description

technical field [0001] The invention relates to the technical field of ultra-pure coal, in particular to a process for preparing ultra-pure coal by an acid-alkali method. Background technique [0002] my country's energy structure is dominated by coal, and coal consumption is huge in the process of economic development. The economy and coal are interdependent and promote each other, maintaining a relationship of mutual dependence. The normal utilization of coal is mainly as primary energy and the transformation of coal. In the current utilization of coal, the most prominent is the preparation of oil substitute coal-water slurry and coal-based materials. As an oil substitute fuel, coal water slurry is a clean coal fuel with low pollution. It needs to have a particularly high calorific value, easy to slagging and ignition, and high-ash coal not only affects the calorific value, but also increases the amount of slagging and fly ash . Generally, coal is only used as fuel, and...

Claims

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Application Information

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IPC IPC(8): C10L9/02
Inventor 赵振宁赵俊国徐国忠方志刚葛志金徐德志王佳慧
Owner UNIV OF SCI & TECH LIAONING
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