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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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  • Claims
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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 present invention uses kaolinite as raw material to prepare alumina-based porous mineral materials by means of oxidative calcination and sodium hydroxide solution leaching. The porous material simultaneously It has the advantages of modified kaolinite and activated alumina with strong adsorption capacity for heavy metal ions. It is used for efficient treatment of heavy metal ion polluted wastewater, and can also realize the enrichment and recycling of heavy metals in wastewater.

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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Effect test

Embodiment 1

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

Embodiment 2

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

Embodiment 3

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