Method for strengthening dissolution of fly ash

A fly ash and dissolution reaction technology, applied in chemical instruments and methods, inorganic chemistry, aluminum compounds, 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: 2020-06-05
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 strengthening 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 invention provides a method for strengthening dissolution of fly ash. The method comprises the following steps: (1) mixing white mud and excessive hydrochloric acid, carrying out dissolution reaction, and carrying out solid-liquid separation; (2) mixing the first solid-liquid separation overflow obtained in the step (1) with fly ash, carrying out a dissolution reaction, and carrying out solid-liquid separation; (3) filtering the second solid-liquid separation underflow obtained in the step (2) to obtain white mud; and (4) recycling the white mud obtained in the step (3) for the step (1). The method further comprises a pre-dissolution process, and the pre-dissolution process comprises the following steps: a, mixing the fly ash and hydrochloric acid, carrying out a pre-dissolution reaction, and carrying out solid-liquid separation; b, filtering the third solid-liquid separation underflow obtained in the step a to obtain white mud; c, returning the white mud obtained in the step b tothe step (1), and then stopping the pre-dissolution procedure; wherein after the pre-dissolution process is stopped, the white mud in the step (1) comes from the step (3). According to the method, thedissolution temperature of active aluminum in the fly ash can be reduced, and the dissolution time is shortened.

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 Applications(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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