Method for preparing aluminium polychlorid from coal ash

A technology of polyaluminum chloride and fly ash, applied in the direction of aluminum chloride, aluminum halide, etc., can solve the problems of polyaluminum chloride with high impurity content, complicated preparation process, Al dissolution, etc., and achieve low cost, simple operation, The effect of improving reactivity

Inactive Publication Date: 2017-12-08
广州百兴网络科技有限公司
View PDF5 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Scholars at home and abroad have done a lot of research work on the preparation of polyaluminum chloride from fly ash, and achieved certain results. However, due to the low activity of fly ash and the strong Si-O-Al bond, the general activation method cannot completely dissolve Al. , even if all of them are dissolved, but because the preparation process is relatively complicated, it is difficult to operate, and the synthesized polyaluminum chloride has a lot of impurities, which limits its industrial application

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for preparing polyaluminum chloride from fly ash, comprising the steps of:

[0039] (1) Grind and sieve the fly ash, then ultrasonically treat it with a mixed acid at 40°C for 8 minutes (power is 580W), separate the solid from the liquid, wash until neutral, and dry to obtain the fly ash after the acid treatment; The acid is a mixture of hydrochloric acid and nitric acid, the mass ratio of hydrochloric acid and nitric acid is 2:1, and the hydrogen ion concentration is 0.81mol / L;

[0040] (2) Mix the acid-treated fly ash in step (1) with NaOH at a mass ratio of 1:1.2, calcinate and activate at 450°C for 45 minutes, pulverize and sieve to obtain preactivated fly ash;

[0041] (3) Mix the pre-activated fly ash prepared in step (2), compound sodium additive (a mixture of sodium carbonate, sodium chloride and sodium sulfate, mass ratio 5:2:1) with water, and activate with 640W microwave for 25min , dried, pulverized, and sieved to obtain secondary activated fly ash...

Embodiment 2

[0045] A method for preparing polyaluminum chloride from fly ash, comprising the steps of:

[0046] (1) Grind and sieve the fly ash, then ultrasonically treat it with a mixed acid at 30°C for 10 minutes (with a power of 500W), separate the solid from the liquid, wash until neutral, and dry to obtain the acid-treated fly ash; The acid is a mixture of hydrochloric acid and nitric acid, the mass ratio of hydrochloric acid and nitric acid is 3:1, and the hydrogen ion concentration is 1mol / L;

[0047] (2) Mix the acid-treated fly ash in step (1) with NaOH at a mass ratio of 1:1, calcinate and activate at 500°C for 30 minutes, pulverize and sieve to obtain preactivated fly ash;

[0048] (3) Mix the pre-activated fly ash prepared in step (2), compound sodium additive (a mixture of sodium carbonate, sodium chloride and sodium sulfate, mass ratio 5:1:1) and water, and activate with 600W microwave for 30min , dried, pulverized, and sieved to obtain secondary activated fly ash; wherein,...

Embodiment 3

[0052] A method for preparing polyaluminum chloride from fly ash, comprising the steps of:

[0053] (1) Grind and sieve the fly ash, then ultrasonically treat it with a mixed acid at 50°C for 5min (power is 600W), separate the solid from the liquid, wash until neutral, and dry to obtain the fly ash after the acid treatment; The acid is a mixture of hydrochloric acid and nitric acid, the mass ratio of hydrochloric acid and nitric acid is 1:1, and the hydrogen ion concentration is 0.5mol / L;

[0054] (2) Mix the acid-treated fly ash in step (1) with NaOH at a mass ratio of 1:1.5, calcinate and activate at 400°C for 1 hour, pulverize and sieve to obtain preactivated fly ash;

[0055] (3) Mix the pre-activated fly ash prepared in step (2), compound sodium additive (a mixture of sodium carbonate, sodium chloride and sodium sulfate, mass ratio 5:3:1) with water, and activate with 800W microwave for 15min , dried, pulverized, and sieved to obtain secondary activated fly ash; wherein,...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention belongs to the technical field of production of a flocculating agent, and in particular relates to a method for preparing aluminium polychlorid from coal ash. The method comprises the following steps: grinding and sieving the coal ash, performing ultrasonic treatment on the coal ash by using mixed acid, mixing the coal ash and NaOH, calcining and activating to obtain pre-activated coal ash; mixing the pre-activated coal ash, a composite sodium aid and water, and further performing microwave activation to obtain secondary activated coal ash; performing secondary activation on the coal ash, performing acid leaching and removing impurities to obtain aluminum hydroxide; and performing acid dissolution on the aluminum hydroxide under high temperature and high pressure, and adjusting the alkalinity degree by calcium aluminate to obtain the aluminium polychlorid. The method for preparing aluminium polychlorid from coal ash provided by the invention is simple in operation, low in cost and suitable for industrial production. The coal ash serves as the raw material, waste is changed into treasures, the production cost is reduced, and environmental pollution caused by discarding of the coal ash solid is avoided.

Description

technical field [0001] The invention belongs to the technical field of flocculant production, and in particular relates to a method for preparing polyaluminum chloride from fly ash. Background technique [0002] my country is a large coal-producing country, and coal is the basic fuel for electricity production. Fly ash is the fine ash collected from the flue gas after pulverized coal combustion. It is one of the main solids discharged from coal-fired power plants and is rich in SiO 2 (mass fraction is 23.1% ~ 62.4%), Al 2 o 3 (mass fraction is 17.8% ~ 30%) and Fe 2 o 3 (mass fraction is 2.0% ~ 7.1%) and other oxides, can be used as the extraction of Al 2 o 3 and SiO 2 important raw materials. The annual discharge of fly ash in my country is large and growing rapidly. Except for a small part of fly ash that is used in building materials, preparation of adsorbents and agriculture, most of the fly ash is temporarily piled up for disposal, which not only occupies a large...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/56
CPCC01F7/56
Inventor 孟青
Owner 广州百兴网络科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap