Method for enhanced dissolution of fly ash

A fly ash and dissolution reaction technology, applied in chemical instruments and methods, aluminum compounds, inorganic chemistry, etc., can solve the problems of high dissolution temperature, long time, and reduced acidity of ore pulp, and achieve low dissolution temperature, short dissolution time, The effect of high dissolution efficiency

Active Publication Date: 2022-04-26
SHENHUA ZHUNNENG RESOURCE COMPREHENSIVE DEV COMPANY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The aforementioned two-stage dissolution process has the following problems: after the first stage of dissolution, most of the active substances in the fly ash have reacted, causing the acidity in the pulp to decrease during the second stage of dissolution, making the low active substances in the fly ash very Difficult to react with low-concentration hydrochloric acid, resulting in higher dissolution temperature (about 160°C) and longer time

Method used

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  • Method for enhanced dissolution of fly ash

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Effect test

Embodiment 1

[0053] Pre-dissolution process:

[0054] Mix 170t of fly ash with 477t of hydrochloric acid with a concentration of 31wt% (that is, the mass ratio of the solute HCl required for the complete reaction of alumina in the fly ash to the solute HCl in hydrochloric acid is 1:0.81) to obtain pre-dissolved pulp; The ore-dissolving slurry enters the dissolution tank and is heated to 140°C for 3 hours of dissolution reaction, then solid-liquid separation, and the filter cake obtained after the third solid-liquid separation underflow filtration is dried to obtain 101t of dry white mud in the pre-dissolution section.

[0055] Two-stage dissolution process:

[0056] 1. Then the 101t dry white mud (pre-dissolved white mud) obtained by the pre-dissolution process is mixed with 521t of hydrochloric acid with a concentration of 31wt% (the mass ratio of the solute HCl in the hydrochloric acid to the aluminum oxide in the white mud is 10:1 ), to obtain a section of ore pulp; then a section of o...

Embodiment 2

[0062] Pre-dissolution process:

[0063] Mix 170t of fly ash with 518t of hydrochloric acid with a concentration of 25wt% (i.e. the mass ratio of the solute HCl required for the complete reaction of alumina in the fly ash to the solute HCl in hydrochloric acid is 1:0.71), and obtain pre-dissolved pulp; then The pre-dissolved pulp enters the dissolution tank and is heated to 110°C for 0.5h of dissolution reaction, then solid-liquid separation, and the filter cake obtained after the third solid-liquid separation underflow filtration is dried to obtain about 110t of dry white mud (pre-dissolved white mud) mud).

[0064] Two-stage dissolution process:

[0065] 1. Then about 110t of dry white mud (pre-dissolved white mud) obtained in the pre-dissolution process is mixed with 727t of hydrochloric acid solution with a concentration of 20wt% (that is, the mass ratio of solute HCl in hydrochloric acid to aluminum oxide in the white mud is 5.9 : 1), to obtain a section of ore pulp; th...

Embodiment 3

[0071] Pre-dissolution process:

[0072] Mix 170t of fly ash with 489t of hydrochloric acid with a concentration of 28wt% (that is, the mass ratio of the solute HCl required for the complete reaction of alumina in the fly ash to the solute HCl in hydrochloric acid is 1:0.75), and obtain the pre-dissolved pulp; then The pre-dissolved pulp enters the dissolution tank and is heated to 125°C for 2 hours of dissolution reaction, then solid-liquid separation, and the filter cake obtained after the third solid-liquid separation underflow filtration is dried to obtain about 106t dry white mud (pre-dissolved white mud ).

[0073] Two-stage dissolution process:

[0074] 1. Then about 106t of dry white mud (pre-dissolved white mud) obtained by the pre-dissolution process is mixed with 538t of hydrochloric acid with a concentration of 29wt% (i.e. the mass ratio of solute HCl in hydrochloric acid to aluminum oxide in the white mud is 7.34: 1) Obtain a section of ore pulp; then send a sec...

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Abstract

The present invention provides a method for enhanced dissolution of fly ash, comprising: (1) mixing white mud with excess hydrochloric acid and performing a dissolution reaction, followed by solid-liquid separation; (2) separating the first solid obtained in step (1). After the liquid separation overflow is mixed with fly ash, a dissolution reaction is carried out, and then solid-liquid separation is performed; (3) the second solid-liquid separation obtained in step (2) is underflow filtered to obtain white mud; (4) the obtained in step (3) is obtained The white mud is recycled to step (1); the method also includes a pre-dissolution process, including: a. predissolving the fly ash and hydrochloric acid after mixing the ingredients, and then solid-liquid separation; b. Solid-liquid separation underflow filtration to obtain white mud; c. the white mud obtained in step b is used in step (1), and then the pre-dissolution process is stopped; wherein, after stopping the pre-dissolution process, the white mud of step (1) from step (3). The method can reduce the dissolution temperature and shorten the dissolution time of active aluminum in fly ash.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of fly ash, in particular to a method for enhanced dissolution of fly ash. Background technique [0002] my country is a big energy consumption country. With the rapid development of the national economy, the demand for energy is increasing day by day. In the structure of primary energy production and consumption in my country, the proportion of coal has been maintained at about 70%. The discharge of solid waste fly ash after coal combustion has increased sharply, which has caused certain impacts on the ecological environment. [0003] The Ordos Zhungeer area of ​​Inner Mongolia is rich in coal resources, and the coal is accompanied by abundant non-ferrous metals such as aluminum, gallium, and lithium. After the mined coal is burned by the boiler of the power plant, a large amount of alumina and gallium are enriched in the obtained fly ash. The content of alumina is usually above 50wt%, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02C01F7/22
CPCC01F7/02C01F7/22
Inventor 郭昭华许立军徐靓李世春范瑞成王连蒙杨磊陈东苗家兵常宁贾秀丽
Owner SHENHUA ZHUNNENG RESOURCE COMPREHENSIVE DEV COMPANY
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