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Preparation method of fly ash based zeolite / alumina composite adsorbing material

A composite adsorption material and fly ash technology, applied in the environmental field, can solve the environmental hazards of waste lye and other problems, achieve high effects of ammonia and phosphorus removal, realize the resource utilization of nitrogen and phosphorus in sewage, and solve environmental problems

Inactive Publication Date: 2012-09-19
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies of the prior art and propose a fly ash-based zeolite / alumina composite adsorption solution that not only solves the environmental hazards caused by the waste caustic in the prior art process, but also utilizes the waste caustic as a resource. Material preparation method

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  • Preparation method of fly ash based zeolite / alumina composite adsorbing material
  • Preparation method of fly ash based zeolite / alumina composite adsorbing material

Examples

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Effect test

Embodiment 1

[0031] Step 1, add 2M (molar concentration) sodium hydroxide solution and fly ash into the double-layer glass reactor (open system) according to the liquid-solid ratio of 10:1 (L / kg), control the temperature of the reactor at 80°C, and the stirring speed 120 rpm, after hydrothermal reaction for 24 hours, cool the suspension to room temperature.

[0032] Step 2, dissolving aluminum chloride hexahydrate in water to prepare an aqueous aluminum chloride solution with a concentration of 0.5M (molar concentration). The aluminum chloride solution was added into the glass reactor by continuous titration, the titration rate was 10ml / min, the stirring rate was 60rpm, the reaction temperature was 20°C, and the end point pH was 6.0. After the reaction is completed, it is centrifuged and the obtained liquid is collected and used for the subsequent preparation of sodium hydroxide solution; the obtained solid is calcined in a muffle furnace for 2 hours at a calcining temperature of 250°C to ...

Embodiment 2

[0035] Step 1, add 5M (molar concentration) potassium hydroxide solution and fly ash into the double-layer glass reactor (open system) according to the liquid-solid ratio of 1.5:1 (L / kg), control the temperature of the reactor at 100°C, and the stirring speed 120 rpm, after hydrothermal reaction for 12 hours, cool the suspension to room temperature.

[0036] Step 2, dissolving aluminum chloride hexahydrate in water to prepare an aqueous aluminum chloride solution with a concentration of 2.5M (molar concentration). The aluminum chloride solution was added into the glass reactor by continuous titration, the titration speed was 50ml / min, the stirring speed was 60rpm, the reaction temperature was 20°C, and the end point pH was 7.0. After the reaction is completed, it is centrifuged, and the obtained liquid is collected and used for the subsequent preparation of potassium hydroxide solution; the obtained solid is dried at 105° C. for 4 hours, and the zeolite / alumina composite adsor...

Embodiment 3

[0039] Step 1: Add 1M (molar concentration) sodium hydroxide solution and fly ash to the stainless steel reaction kettle (closed system) according to the liquid-solid ratio of 6:1 (L / kg), control the temperature of the reaction kettle to 200°C, and the stirring speed to 80rpm , after hydrothermal reaction for 3 hours, the suspension was cooled to room temperature.

[0040] Step 2, dissolving aluminum chloride hexahydrate in water to prepare an aqueous aluminum chloride solution with a concentration of 5M (molar concentration). The aluminum chloride solution was added into the stainless steel reaction kettle by continuous titration, the titration speed was 100ml / min, the stirring speed was 60rpm, the reaction temperature was 25°C, and the terminal pH was 5.5. After the reaction is completed, filter and separate, the obtained liquid is collected and continued to be used for the subsequent preparation of sodium hydroxide solution; the obtained solid is calcined in a muffle furnac...

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Abstract

The invention discloses a preparation method of fly ash based zeolite / alumina composite adsorbing material, which comprises the following steps: metal lye solution and fly ash are mixed to be subjected to hydrothermal synthesis reaction; soluble aluminum stearate solution is continuously added in the mixture of the synthetic zeolite and waste lye liquor under stirring drop by drop, after solid-liquid separation, the solid phase is subjected to heat treatment to obtain zeolite / alumina composite adsorbent material, and the remaining solution is used to the preparation of lye solution in the subsequent synthesis process. According to the preparation method of the fly ash based zeolite / alumina composite adsorbing material, the waste lye liquor generated during the zeolite synthetizing with fly ash is changed into alumina, so that the long-standing unsolved problems that waste lye produced when the fly ash is used as raw material to produce zeolite cannot be treated, and the zeolite product has strong basicity can be solved, and the prepared zeolite / alumina composite adsorbing material has more efficient adsorption effect on nitrogen and phosphorus nutrients in the water, so the treatment of wastes with processes of waster against one another can be achieved; and the synthesis process is simple, and the cost is low.

Description

technical field [0001] The invention relates to a method in the field of environmental technology, in particular to a method for preparing a zeolite / alumina composite adsorption material using fly ash as a basic raw material. Background technique [0002] Fly ash is a kind of solid waste worldwide, which is the residual ash produced after coal combustion. Its treatment has already attracted widespread attention from scholars and the public. At present, in terms of reuse of fly ash, it is mainly used as an ingredient in building materials such as cement and concrete. On the one hand, the amount of fly ash used in the construction industry is limited after all. On the other hand, from the perspective of long-term sustainable reuse, it is also very necessary to seek reuse methods with higher added value. [0003] After searching the literature of the prior art, it was found that the Chinese patent application No. 200410084313.6 proposed a method for synthesizing zeolite with f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18B01J20/30
Inventor 吴德意谢杰李春杰孟文娜王哲
Owner SHANGHAI JIAO TONG UNIV
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