Device and method for synthesizing zeolite molecular sieves by solid waste materials
A technology for synthesizing solid waste and zeolite, which is applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems of less lye production, low energy consumption, difficult lye treatment, etc., and achieves reduction in the amount of alkali used and good separation effect. , the effect of a wide range of sorting
Inactive Publication Date: 2013-04-17
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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[0007] The synthesis methods of these two zeolite molecular sieves are all batch production methods, and the annual output is low (less than 800t / y), so it is impossible to continuously mass-produce molecular sieves, and the above-mentioned two methods all use common heating methods, and the synthesis reaction time of molecular sieves is long. It consumes a lot of energy, has high cost, and produces a large amount of lye, which makes subsequent lye treatment difficult
At present, there is a lack of a method and device with short reaction time, low energy consumption, low cost, less lye production, and continuous mass production of zeolite molecular sieves. The three functions of the machine
[0008] On the other hand, solid waste raw materials have Fe 3 o 4 , toxic chlorides (such as polychlorinated diphenyl-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs)) and various heavy metals, some of which are highly toxic and seriously pollute environment, it is therefore necessary to separate, recycle or reuse these toxic substances in a safe manner
Such as: when adopting the hydrothermal synthesis method to utilize the solid waste containing these toxic substances to synthesize zeolite molecular sieves, a considerable part of heat is used for heating these toxic substances, causing the energy utilization rate of solid waste to synthesize molecular sieves to be very low; at the same time, the solid waste If these toxic substances enter the synthetic molecular sieve without treatment, it will lead to a decrease in the quality of the molecular sieve product, and even easily cause secondary pollution. Therefore, the raw materials need to be pretreated before using solid waste to prepare molecular sieves.
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[0044] The device structure of the present invention is:
[0045] A pretreatment tank 1 pipeline is connected to one end of a superconducting magnetic separator 2, and the other end of the superconducting magnetic separator pipeline 2 is connected to a reaction tank 3 in which a heater and a spiral stirring device (known technology, The picture is not shown); the discharge port of the reaction tank 3 is located above the conveyor belt 4, so that the conveyor belt 4 can receive the material output from the reaction tank 3. A microwave radiator 5 and a conveyor belt 4 are installed above the conveyor belt 4 The other end of the product is conveyed to the washing tank 6, which is connected to the dehydration device 7 and the drying device 9.
[0046] In the present invention, solid waste (such as fly ash and red mud, etc.) and alkali (such as NaOH) in the alkali storage tank 12 are added to the pretreatment tank 1, and an appropriate amount of water is added to form a mixed solution; ...
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The invention relates to a method for synthesizing zeolite molecular sieves by solid waste materials. The method comprises the following steps of: 1) preparing the solid waste materials and alkaline water solution into mixed solution; 2) carrying out superconducting separation pre-treatment on the mixed solution; 3) carrying out aging gelling reaction on the mixed solution subjected to the superconducting separation pre-treatment, wherein the aging gelling reaction temperature is 60 to 80 DEG C; 4) carrying out microwave radiation on a mixture after the aging gelling reaction to generate the crystallization effect and generating the zeolite molecular sieves; and 5) washing, dewatering and baking the generated zeolite molecular sieves and obtaining final products. The invention also discloses a device for realizing the method. The method and the device have the advantages that the superconducting separation pre-treatment is adopted, so raw materials are nontoxic, the processing quantity is high, the sorting range is wide, the operation energy consumption is low, and the separation effect is good. The crystallization reaction is carried out by adopting microwaves for heating the rawmaterials, the time of the crystallization reaction is greatly shortened, the alkali consumption is reduced, the subsequent alkali liquor treatment difficulty is reduced, and the method and the device can be used for continuously producing a large number of zeolite molecular sieves.
Description
Technical field [0001] The present invention relates to a method and device for preparing zeolite molecular sieves from solid wastes, in particular to the use of superconducting magnetic separation pretreatment to remove harmful substances such as toxic chlorides and heavy metals in solid wastes to make the solid wastes harmless. Based on the use of microwave heating to synthesize zeolite molecular sieves. Background technique [0002] Zeolite molecular sieve is a kind of water-containing framework silica (aluminate) porous mineral crystal material with regular pore structure and unique crystal chemistry. Due to its unique crystal structure and crystal chemical properties, zeolite molecular sieves have a large specific surface area and excellent adsorption, separation, ion exchange and catalysis properties, and have a wide range of uses in the fields of chemical engineering, building materials, agriculture, and environmental protection. [0003] However, natural zeolite resources ...
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IPC IPC(8): C01B39/02
Inventor席北斗赵颖夏训峰李晓光牛永超管伟雄王丽君
OwnerCHINESE RES ACAD OF ENVIRONMENTAL SCI