Method for preparing alumina-based porous mineral material

A technology of mineral materials and alumina, which is applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problems of complex adsorption material process, high cost, and insufficient adsorption capacity of heavy metal ions, etc., to achieve Wide application prospects, low cost, and excellent solubility effects

Active Publication Date: 2011-09-21
CENT SOUTH UNIV
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Problems solved by technology

The adsorption effect of kaolinite on heavy metal ions can be improved by activation treatment, increasing specific surface area, etc. Modified kaolinite and intercalated kaolinite are based on this principle, but the process of preparing adsorption materials by pillared intercalation method is relatively complicated and costly. high
[0007] In order to overcome the technical problem that the existing kaolinite has insufficient adsorption capacity for heavy metal ions, the pre

Method used

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  • Method for preparing alumina-based porous mineral material
  • Method for preparing alumina-based porous mineral material

Examples

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Example Embodiment

[0020] Example 1: Grind kaolinite with a purity of 90% to a particle size of -100 mesh and a mass percentage of 72%. The fine-grained kaolinite is calcined at 1050°C for 30 minutes, and the calcined kaolinite is 120g / L The sodium hydroxide solution is stirred and leached with a solid-liquid mass ratio of 1:10. After leaching for 90 minutes at 120℃, after solid-liquid separation and drying, the alumina-based porous material is obtained. The alumina mass percentage is 70% and the BET specific surface area is 41.1m. 2 / g, the average pore diameter is 9.39nm; the material is put into the heavy metal ion solution containing copper, cadmium, and lead ion concentrations of 49.95mg / L, 50.88mg / L and 52.03mg / L, and the copper is adsorbed at 30℃ The adsorption capacity of ion 30min, cadmium ion 120min, and lead ion 120min were 22.6mg / g, 24.9mg / g and 25.8mg / g respectively.

Example Embodiment

[0021] Example 2: Grinding kaolinite with a purity of 90% to a particle size of -100 mesh and a mass percentage of 76%. The fine-grained kaolinite is calcined at 1100°C for 15 minutes, and the calcined kaolinite is 120g / L The sodium hydroxide solution is stirred and leached with a solid-liquid mass ratio of 1:8. After leaching for 120 minutes at 120℃, after solid-liquid separation and drying, the alumina-based porous material is obtained. The alumina mass percentage is 76% and the BET specific surface area is 45.3m. 2 / g, the average pore diameter is 8.53nm; the material is put into a heavy metal ion solution containing copper, cadmium, and lead ion concentrations of 49.95mg / L, 50.88mg / L and 52.03mg / L, and adsorbs copper at 30℃ The adsorption capacity of ion 30min, cadmium ion 120min, and lead ion 60min were 22.9mg / g, 30.4mg / g and 27.5mg / g respectively.

Example Embodiment

[0022] Example 3: Grinding kaolinite with a purity of 90% to a particle size of -100 mesh and a mass percentage of 80%. The fine-grained kaolinite is calcined at 1150°C for 15 minutes, and the calcined kaolinite is 120g / L The sodium hydroxide solution is stirred and leached with a solid-liquid mass ratio of 1:10. After leaching for 90 minutes at 90℃, after solid-liquid separation and drying, the alumina-based porous material is obtained. The alumina mass percentage is 79% and the BET specific surface area is 51.4m. 2 / g, the average pore diameter is 8.72nm; the material is put into the copper, cadmium, lead ion concentration of 49.95mg / L, 50.88mg / L and 52.03mg / L respectively, and the copper ion and cadmium are adsorbed at 30℃ for 30min The adsorption capacity of ion 120min and lead ion 60min are 31.6mg / g, 54.9mg / g and 47.4mg / g respectively.

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Abstract

The invention discloses a method for preparing an alumina-based porous mineral material, which comprises the following steps of: grinding kaolinite with the purity of not less than 90 percent into 70 to 80 mass percent of fine particles with the particle size of -100 meshes; calcining the kaolinite fine particles at the high temperature of between 1,050 and 1,150 DEG C for 10 to 30 minutes; extracting silica from the calcined kaolinite by using 100 to 140g/L sodium hydroxide solution in a solid-liquid mass ratio of 1:8-1:12 at the temperature of between 90 and 140 DEG C for 90 to 120 minutes with stirring; and performing solid-liquid separation, and drying the obtained solid to obtain the alumina-based porous mineral material which has a good effect of adsorbing heavy metal ions in solution. The alumina-based porous mineral material prepared by the method is prepared from natural minerals with wide sources and large resource reserves, can be used for treating heavy metal ion polluted wastewater, and has a wide application prospect in the environment-friendly industry, and the preparation process is simple, and low in cost.

Description

technical field [0001] The invention relates to a preparation method of an alumina-based porous mineral material, in particular to a method for preparing an alumina-based porous mineral material using kaolinite as a raw material for treating waste water polluted by heavy metal ions. Background technique [0002] With industrial progress and social development, the problems of water pollution and soil pollution are becoming more and more serious. At least 100 million t / d of sewage in cities and towns across the country is directly discharged into water bodies without treatment, the water quality of more than half of the seven major river systems is polluted, 1 / 3 of the country's water bodies are not suitable for fish, and 1 / 4 of It is not suitable for irrigation, 90% of urban waters are seriously polluted, 50% of urban water sources do not meet drinking water standards, 40% of water sources are undrinkable, and 60% to 70% of the total water shortage in southern cities is caus...

Claims

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Application Information

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IPC IPC(8): B01J20/08B01J20/30C02F1/28C02F1/62
Inventor 李光辉姜涛范晓慧程伟张元波郭宇峰杨永斌李骞陈许玲许斌饶明军张吉清罗骏朱忠平白国华黄柱成
Owner CENT SOUTH UNIV
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