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Method for producing aluminum oxide from coal ash through acid process

A technology of fly ash and alumina, which is applied in the direction of alumina/hydroxide, etc., can solve the problems of waste of water resources and achieve the effects of relieving pressure, reducing water consumption and cost

Active Publication Date: 2014-05-21
CHINA SHENHUA ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to provide a method for producing alumina by fly ash acid method to solve the problem of serious waste of water resources in the process of producing alumina from fly ash in the prior art

Method used

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  • Method for producing aluminum oxide from coal ash through acid process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Into the fly ash according to 2.5m 3 / t fly ash ratio plus water to prepare the original slurry, enter the magnetic separation system with 0.3m 3 / t Fly ash flushing water washes down the iron-rich mortar, and the iron-rich mortar is filtered to obtain an iron-rich filter cake and an iron-rich filtrate, of which the iron-rich filtrate is 0.3m 3 / t Fly ash is returned to continue to be used as flushing water, and the iron-poor mortar after magnetic separation is also filtered to obtain iron-poor filter cake and iron-poor filtrate, wherein the iron-poor filtrate is 3 The amount of / t fly ash is returned to the original slurry, and the first-effect secondary steam condensate is 0.95m 3 The amount of fly ash per ton and the condensed water of the second-effect secondary steam are respectively set at 0.05m 3 The amount of / t fly ash is used to supplement the preparation of the original slurry.

[0053] Put the iron-poor filter cake in an acid-resistant reaction kettle, ad...

Embodiment 2

[0058] Into the fly ash according to 2.83m 3 / t fly ash ratio plus water to prepare the original slurry, enter the magnetic separation system with 0.5m 3 / t Fly ash flushing water washes down the iron-rich mortar, and the iron-rich mortar is filtered to obtain iron-rich filter cake and iron-rich filtrate, of which the iron-rich filtrate is 0.5m 3 / t Fly ash returns to continue to be used as flushing water, and the iron-poor mortar after magnetic separation is also filtered to obtain iron-poor filter cake and iron-poor filtrate, in which the iron-poor filtrate is 2.16m 3 The amount of / t fly ash is returned to the original slurry, and the condensate of the first effect and the second steam is 0.16m 3 The amount of fly ash per ton and the condensed water of the secondary steam of the second effect are respectively set at 0.51m 3 The amount of / t fly ash is used to supplement the preparation of the original slurry.

[0059] Put the iron-poor filter cake in an acid-resistant re...

Embodiment 3

[0064] Into the fly ash according to 3.0m 3 The proportion of / t fly ash is added with water to prepare the original slurry, and the dosage for entering the magnetic separation system is 0.7m 3 / t Fly ash flushing water washes down the iron-rich mortar, and the iron-rich mortar is filtered to obtain iron-rich filter cake and iron-rich filtrate, of which the iron-rich filtrate is 0.7m 3 / t Fly ash is returned to continue to be used as flushing water, and the iron-poor mortar after magnetic separation is also filtered to obtain iron-poor filter cake and iron-poor filtrate, of which the iron-poor filtrate is 2.36m 3 The amount of / t fly ash is returned to the original slurry, and the first-effect secondary steam condensate is 0.02m 3 The amount of fly ash per ton and the condensed water of the second-effect secondary steam are respectively set at 0.62m 3 The amount of / t fly ash is used to supplement the preparation of the original slurry.

[0065] Put the iron-poor filter cak...

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Abstract

The invention provides a method for producing aluminum oxide from coal ash through an acid process. The method comprises the steps: S1, mixing coal ash and a solvent to obtain primary slurry, carrying out magnetic separation on the primary slurry, and filtering to obtain a Fe-poor filter cake; S2, carrying out acid dissolution on the Fe-poor filter cake to obtain acid slurry; S3, carrying out residue-liquid separation on the acid slurry to obtain an aluminum chloride solution and residues; S4, carrying out resin adsorption on the aluminum chloride solution to remove impurities to obtain a refined aluminum chloride solution; S5, carrying out concentration and crystallization treatment on the refined aluminum chloride solution to obtain an aluminum chloride crystal and condensed water; S6, calcining the aluminum chloride crystal to obtain aluminum oxide. The solvent in the step S1 comprises at least part of the condensed water in the step S5. The condensed water generated in the step S5 is used for preparing the primary slurry, so that the condensed water is reutilized, the condensed water treating burden in the traditional process is relieved, and the water consumption and cost are reduced.

Description

technical field [0001] The invention relates to the field of fly ash treatment, in particular to a method for producing alumina by an acid method from fly ash. Background technique [0002] my country is rich in coal resources, and coal is used as the basic fuel for power production. With the rapid development of the energy industry, the discharge of fly ash has increased sharply, which has caused great pressure on the national economic construction and the ecological environment. Because fly ash contains useful mineral resources such as alumina and gallium, the comprehensive utilization of fly ash and turning waste into treasure has become a widespread research hotspot. [0003] At present, among the methods for extracting alumina from fly ash, the acid method is being widely used due to its advantages such as high dissolution rate of alumina extraction, simple process, and recyclable acid. [0004] CN1792802A discloses "a method for extracting alumina from fly ash". In t...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 王启瑞邹萍池君洲松丽涛王永旺高桂梅翟正江刘大锐
Owner CHINA SHENHUA ENERGY CO LTD
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