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Method for preparing pseudo-boehmite by pulverized fuel ash

A pseudo-boehmite and fly ash technology, which is applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, carbonate preparation, alumina/aluminum hydroxide, etc., can solve the problem of high cost of raw materials , to achieve the effect of reducing production cost, low operating cost and high crystallinity

Inactive Publication Date: 2013-01-02
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing pseudo-boehmite by using fly ash, which is used to solve the problem of high raw material cost in the existing method for preparing pseudo-boehmite

Method used

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  • Method for preparing pseudo-boehmite by pulverized fuel ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] combine figure 1 Shown, this utilizes fly ash to prepare the method for pseudo-boehmite:

[0031] Collect fly ash on site, grind it into fine powder, pass through a 200-mesh sieve, take 100g of fine powder and place it in a muffle furnace. Wash twice with water for 3 hours each time, then separate the washing liquid from the fly ash for solid-liquid separation, and dry the solid at 120°C for 5 hours after separation;

[0032] The pretreated fly ash and Na 2 CO 3 The solid mass ratio is 1:1 and mixed evenly. After roasting at 830°C for 1 hour, take it out to 25°C for later use; then impregnate the roasted product with 6mol / L HCl for 2 hours, filter, and remove insoluble matter to obtain silica-rich gel and crude AlCl 3 solution.

[0033] Crude AlCl 3 The pH value of the solution was adjusted to 5.7, the generated precipitate was filtered and washed, and then NaOH was continued to be added dropwise to dissolve the precipitate until the pH was 11, and after filtration...

Embodiment 2

[0038] This method utilizing fly ash to prepare pseudo-boehmite:

[0039] Collect fly ash on site, grind it into fine powder, pass through a 200-mesh sieve, take 100g of fine powder and place it in a muffle furnace, calcinate it at 900°C for 10 hours, and then burn it under the conditions of 45°C and 300r / min. Wash 3 times with water for 3 hours each time, then separate the washing solution from the fly ash solid-liquid, and dry the solid at 120°C for 5 hours after separation.

[0040] The pretreated fly ash and Na 2 CO 3 The mass ratio of solids is 1:1.5, mixed evenly, roasted at 880°C for 1.5h, then taken out to 25°C for use; then impregnated the roasted product with 7.2mol / L HCl for 2.5h, filtered to remove insoluble matter, and obtained silica-rich gel and Crude AlCl 3 solution.

[0041] Crude AlCl 3 The pH value of the solution was adjusted to 6, and the generated precipitate was filtered and washed, and then NaOH was continued to be added dropwise to dissolve the pr...

Embodiment 3

[0046] This method utilizing fly ash to prepare pseudo-boehmite:

[0047] Collect fly ash on site, grind it into fine powder, pass through a 200-mesh sieve, take 100g of fine powder and place it in a muffle furnace. Wash once with water for 1 hour each time, then separate the washing solution from the fly ash solid-liquid, and dry the solid at 120°C for 5 hours after separation.

[0048] The pretreated fly ash and Na 2 CO 3 The solid mass ratio is 1:1.5 and mixed evenly. After roasting at 750°C for 2 hours, take it out to 25°C for later use; then impregnate the roasted product with 2mol / L HCl for 0.5h, filter, and remove insoluble matter to obtain silica-rich gel and crude AlCl 3 solution.

[0049] Crude AlCl 3 The pH value of the solution was adjusted to 4.6, and the generated precipitate was filtered and washed, and then NaOH was continued to be added dropwise to dissolve the precipitate until the pH was 10. After filtering, a purified sodium metaaluminate solution was o...

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Abstract

The invention relates to a method for preparing pseudo-boehmite by pulverized fuel ash, which comprises the steps of: pretreating the pulverized fuel ash; roasting the pretreated pulverized fuel ash and Na2CO3 at the high temperature to obtain silicon-rich gel and a coarse AlCl3 solution; preparing a purified sodium metaaluminate solution by the coarse AlCl3 solution; adjusting the concentration of the purified sodium metaaluminate solution to be 0.8-2.0mol / L, adding a NaHCO3 solution with the concentration of 0.8-2.0mol / L, and carrying out reaction to obtain gel; carrying out ageing on the product for 10-30hours under the conditions that the temperature is 50-100 DEG C and the pH value is 7-11; filtering and separating to obtain a filter cake and a filtrate; and washing the filter cake by deionized water and drying to obtain the pseudo-boehmite finished product. The invention provides a new technical route for preparing the pseudo-boehmite with high added-value by the low-cost pulverized fuel ash, and the pulverized fuel ash is processed and treated, so that the environmental pollution caused by the pulverized fuel ash is reduced.

Description

1. Technical field: [0001] The invention relates to the technical field of solid waste resource utilization and material chemical preparation, and specifically relates to a method for preparing pseudo-boehmite by using fly ash. 2. Background technology: [0002] Fly ash is a fine-grained dispersed residue produced after the combustion of pulverized coal in the production process of coal-fired power plants. With the continuous development of science and technology, fly ash can be used as raw materials for building materials and chemical products. Due to its wide range of sources and low price, it is gradually favored by people in the international market. my country is the largest coal producing and consuming country. With the rapid development of economy, its demand continues to increase, and the discharge of fly ash also increases sharply. According to statistics, in 2010, my country's fly ash discharge was about 300 million tons, less than half of which was used for cemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01F7/14C01D7/12
Inventor 陈彦广陆佳韩洪晶张永军张荣明李萌
Owner NORTHEAST GASOLINEEUM UNIV
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