Method and device for preparing synthetic zeolite from flyash zero discharged waste alkali liquid

A technology for synthesizing zeolite and spent lye, which is applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems of low investment costs and achieve the effects of protecting the environment, saving alkali costs, and low investment costs

Inactive Publication Date: 2005-10-19
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0005] The object of the present invention is to aim at the deficiencies in the prior art, propose a kind of preparation method and the device of the fly ash synthetic zeolite of waste lye zero discharge, with less investment cost, not only solve the environmental problem that waste lye discharge causes, It can also save the cost of alkali required in the production process and realize the resource utilization of fly ash

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  • Method and device for preparing synthetic zeolite from flyash zero discharged waste alkali liquid

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preparation example Construction

[0018] The preparation device structure that embodiment adopts is as figure 1 As shown, it mainly includes a zeolite synthesis reaction tank 3, a solid-liquid separation and dehydration tank 8 and a dissolution tank 5, and the dissolution tank 5 is connected to the zeolite synthesis reaction tank 3 and the solid-liquid separation and dehydration tank 8 through flexible hoses 7 respectively, and connected to the connecting pipe respectively. Metering pump 6 is set on the road. The top inlet of the zeolite synthesis reaction tank 3 is equipped with a fly ash raw material metering device 1, the interior of the zeolite synthesis reaction tank 3 is equipped with a stirring device 2, the lower part of the zeolite synthesis reaction tank 3 is provided with a heater 4, and the outlet of the zeolite synthesis reaction tank 3 is passed through a metering The pump 6 is connected to the solid-liquid separation and dehydration tank 8, and the solid-phase zeolite product outlet of the solid...

Embodiment 1

[0021] The solid waste fly ash remaining after coal combustion is used as the raw material, weighed by the fly ash raw material measuring device 1 , and put into the zeolite synthesis reaction tank 3 . Prepare 1M (molar concentration) NaOH solution in the dissolving tank 5, send it into the zeolite synthesis reaction tank with a metering pump at a liquid-solid ratio of 6, fully mix the two with the stirring device 2, and use the heating device 4 to make the zeolite synthesis reaction The tank contents are kept at a temperature of 95° C., and reacted under this condition for 24 hours. The reaction product is sent into the dehydration tank 8 for solid-liquid separation with a metering pump, where the solid phase and liquid phase are separated. The solid phase is washed in a washing tank 9 and dried in a drying device 10 to obtain a zeolite product. Carry out sub-packaging at finished product bagging place 11, then leave the factory. The alkalinity of the waste lye produced by t...

Embodiment 2

[0023]The solid waste fly ash remaining after coal combustion is used as the raw material, weighed by the fly ash raw material measuring device 1 , and put into the zeolite synthesis reaction tank 3 . Prepare 2.5M (molar concentration) NaOH solution in the dissolving tank 5, and send it into the zeolite synthesis reaction tank 3 with a metering pump at a ratio of 4 to the liquid-solid ratio, fully mix the two with the stirring device 2, and use the heating device 4 to make the zeolite The content of the synthesis reaction tank was kept at a temperature of 120° C., and reacted under this condition for 8 hours, and the reaction product was sent into the dehydration tank 8 for solid-liquid separation with a metering pump, where the solid phase and liquid phase were separated. The solid phase is washed in the washing tank 9 and dried by the drying device 10 to obtain the zeolite product, which is packaged at the finished product bagging place 11 and then shipped out. The alkalinit...

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Abstract

The present invention relates to preparation process and apparatus of synthetic zeolite with flyash as material and no waste alkali liquid exhaust. Except traditional zeolite synthesizing reaction tank and solid-liquid separating dewatering tank, the apparatus has one additional dissolving tank for the component and alkalinity regulation and circulating use of waste alkali liquid. The preparation process includes reaction between flyash and sodium carbonate in the reaction tank to convert into zeolite, solid-liquid separating in the solid-liquid separating dewatering tank to obtain solid phase zeolite product and waste alkali liquid, regulating the Si/Al ratio of waste alkali liquid in the dissolving tank and returning the used alkali liquid into the reaction tank for reuse. The present invention has saving of alkali and water and eliminates environmental pollution.

Description

technical field [0001] The invention relates to a preparation method and device for synthesizing zeolite from fly ash, which recycles waste lye produced in the preparation of zeolite minerals by a hydrothermal method, and realizes zero discharge of waste lye in the zeolite production process. It belongs to the technical field of environmental protection. Background technique [0002] Coal is an important primary energy source, and its combustion process produces a large amount of by-product—fly ash in addition to energy. Fly ash accounts for about 20-30% of the weight of coal, and is one of the largest inorganic solid wastes in the world. The annual production of fly ash in major countries is as follows: 60 million tons / year in the United States; 38.5 million tons / year in Europe; 160 million tons / year in my country. Due to the certain cohesion of fly ash, part of fly ash is currently being reused in the production of building materials (cement, concrete, etc.). Its reuse ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02
Inventor 吴德意何圣兵孔海南
Owner SHANGHAI JIAO TONG UNIV
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