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Method for preparing active aluminum oxide utilizing industrial sludge of aluminium section bar plant

A technology of activated alumina and industrial sludge, which is applied in the direction of alumina/hydroxide preparation, pyrolysis treatment sludge, solid waste removal, etc., to achieve the effect of low raw material cost, high conversion rate and strong market competitiveness

Inactive Publication Date: 2004-12-29
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, no report has been made at home and abroad to use industrial sludge from aluminum profile factories to prepare activated alumina. This project is the first researched and invented technology and process at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Add dilute nitric acid solution to the weighed dry sludge, and constantly stir the sludge to form a plastic sludge mass. Use the tumbling granulation method to shape the plastic clay into a spherical body with a diameter of 4-6mm. After natural drying for 24 hours, move it into the drying room for drying. Control the water content to about 5%. Pack the dried spherical particles Put it into a sagger, put it in a high-temperature furnace for calcination, the sintering temperature is 450°C, the sintering holding time is 2 hours, the heating rate is controlled at 80°C / hour, and then naturally cooled to room temperature. The calcined products were tested for specific surface area, average pore diameter, pore volume, water absorption and compressive strength. The test data are listed in Table 1.

[0012] Table 1 Example 1: The influence of concentration of nitric acid solution on the performance of activated alumina

[0013] Experiment number HNO 3 :H 2 O (w...

Embodiment 2

[0022]Embodiment 2 fixed acid water ratio, i.e. HNO 3 :H 2 O=1:6, change the ratio of dilute acid to dry sludge, and explore its influence on material properties. The preparation method is the same as in Example 1.

[0023] Table 2 Example 2 Dilute nitric acid solution consumption and dry sludge consumption ratio influence on material performance (HNO 3 :H 2 O)

[0024] Experiment number dilute acid / dried sludge specific surface area (m 2 / g) average pore diameter (nm) pore volume (cm 3 / g) Phase

[0025] Sample 8 1:1.5 260 3.25 0.18 γ-Al 2 o 3

[0026] Sample 9 1:1.8 267 3.52 0.20 γ-Al 2 o 3

[0027] Sample 10 1:2.1 267 4.04 0.23 γ-Al 2 o 3

[0028] Sample 11 1:2.4 264 4.68 0.27 γ-Al 2 o 3

[0029] Sample 12 1:2.7 400 4.33 0.46 γ-Al 2 o 3

Embodiment 3

[0031] HNO in Example 3 3 :H 2 O=1:7, the ratio of the amount of dilute nitric acid solution to the amount of dry sludge was 1:2.4, and the influence of sintering temperature on the properties of materials was discussed. The preparation method is the same as in Example 1.

[0032] Table 3 Example 3: Effects of different sintering temperatures on material properties

[0033] Experiment number Sintering temperature (°C) Specific surface area (m 2 / g) average pore diameter (nm) pore volume (cm 3 / g) Phase

[0034] Sample 13 500 349 4.88 048 γ-Al 2 o 3

[0035] Sample 14 600 255 5.00 0.24 γ-Al 2 o 3

[0036] Sample 15 700 236 5.38 0.32 γ-Al 2 o 3

[0037] Sample 16 800 182 6.32 0.32 γ-Al 2 o 3

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PUM

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Abstract

The present invention belongs to the field of the comprehensive utilization of waste solid, and is especially to biological environment material technology. The production process of active alumina with industrial sludge from aluminum section factory includes depositing waste liquid to obtain sludge as solid waste with main components of gamma-AlOOH and Al(OH)3 and amorphous structure; and mixing dilute nitric acid with dry sludge to form plastic mud and to obtain active alumina with crystal phase gamma-Al2O3. The prepared active alumina is white or grey sphere, column or other grain, and has great specific surface area and great porosity.

Description

Technical field: [0001] The invention relates to a method for preparing activated alumina by using industrial sludge from an aluminum profile factory as a raw material, which belongs to the comprehensive utilization of solid waste, and precisely belongs to the technical field of ecological environment materials. technical background: [0002] Aluminum profile factory industrial sludge is a large amount of waste liquid produced during the surface treatment of aluminum profiles. It is a milky white colloidal solution with ultrafine and highly dispersed particles. Once this waste liquid is discharged, it will inevitably seriously pollute the environment and river waters, and destroy the ecology. Therefore, before the waste liquid is discharged, a large amount of sludge generated during the treatment process must be removed. The factory adopts sedimentation and filtration methods to filter out solid sludge, and the remaining clarified filtrate is discharged. The main component...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00C01F7/30C02F11/10
Inventor 阮玉忠于岩吴任平杜育红林春莺
Owner FUZHOU UNIV
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