Method for preparing zeolite by using sintered bed mud as material

A technology for bottom sludge and zeolite, which is applied in the fields of crystalline aluminosilicate zeolite, chemical instruments and methods, sludge treatment, etc. Low, realize high added value, realize the effect of resource utilization

Inactive Publication Date: 2007-05-09
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage of this method is that due to the consideration of using the sintered sediment directly as a building material, its added value is low
Especially when the source of mud as a raw material for building materials is not tight, sintered bottom mud does not have a competitive advantage and is difficult to promote

Method used

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  • Method for preparing zeolite by using sintered bed mud as material

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Effect test

Embodiment 1

[0017] The traditional hydrothermal synthesis method is adopted, so the synthesis reaction does not go through the melting furnace, but the raw materials and ingredients are directly put into the zeolite synthesis reaction tank 3 .

[0018] The raw material is sintered bottom sludge, that is, the sludge under water bodies such as rivers and lakes after sintering in an aerobic or reducing atmosphere at medium temperature (500-900°C) or high temperature (900-2000°C). The ingredients are sodium silicate and table salt, wherein the sodium silicate is 10% of the weight of the sintered bottom mud, and the table salt is 20% of the weight of the sintered bottom mud. Prepare a 2.5M (molar concentration) NaOH solution in the dissolving tank 5, send it into the zeolite synthesis reaction tank 3 with a metering pump at a solid-to-liquid ratio of 1:4, fully mix it with the stirring device 2, and use the heating device 4 to synthesize the zeolite The contents of the reaction tank were kept ...

Embodiment 2

[0020] The traditional hydrothermal synthesis method is adopted, so the synthesis reaction does not go through the melting furnace, but the raw materials and ingredients are directly put into the zeolite synthesis reaction tank 3 . The raw material is sintered bottom mud, and the ingredients are metal aluminum foil and sodium fluoride, wherein the aluminum foil is 5% of the weight of the sintered bottom mud, and the sodium fluoride is 15% of the weight of the sintered bottom mud. Prepare a 1.5M (molar concentration) NaOH solution in the dissolving tank 5, send it into the zeolite synthesis reaction tank 3 with a metering pump at a solid-to-liquid ratio of 1:6, fully mix it with the stirring device 2, and use the heating device 4 to synthesize the zeolite The contents of the reaction tank were kept at a temperature of 200° C., and reacted under this condition for 2 hours. The reaction product was sent into the dehydration tank 8 for solid-liquid separation with a metering pump, ...

Embodiment 3

[0022] A two-step synthesis method is adopted, the raw material is sintered bottom sludge, and the ingredients are solid NaOH and metal aluminum foil, wherein the dosage of solid NaOH is the same as that of the sintered bottom sludge, and the added amount of aluminum foil is 5% of the weight of the sintered bottom sludge. Raw ingredients are put into the melting furnace 1, the melting temperature is 500° C., and the melting time is 1 hour. The melted material is transferred to the zeolite synthesis reaction tank 3. The production water contained in the dissolving tank 5 is sent into the reaction tank 3 with a metering pump at a solid-to-liquid ratio of 1:8. Fully mix with the stirring device 2, keep the content of the zeolite synthesis reaction tank at a temperature of 90°C with the heating device 4, and keep it under this condition for 2 hours, and send the reaction product into the dehydration tank 8 for solid-liquid separation with a metering pump, where The solid and liqu...

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Abstract

This invention relates to a method for preparing zeolite by using sintered bottom sludge as the raw material. The method comprises: adding Al, Si, Cl or F-containing additives that can be solved in alkaline solution to sintered bottom sludge, and performing traditional hydrothermal method or two-step method to prepare zeolite. The traditional hydrothermal method comprises: adding NaOH or KOH solution into the raw material and the additive, heating in a reaction kettle, and reacting to prepare zeolite. The two-step method comprises: mixing the raw material and the additive with solid NaOH or KOH, melting in a furnace, transferring into a reaction kettle, adding water and heating to prepare zeolite. After adjusted with alkalinity and Si/Al ratio, the waste alkaline solution can be recycled as the alkali source in the traditional method to prepare zeolite. Sintering technique is an effective means to realize harmless treatment of bottom sludge that is pollutive to water bodies. This invention can realize efficient utilization of sintered bottom sludge, and can obtain zeolite with high added value.

Description

technical field [0001] The invention relates to a method for preparing zeolite by using sintered bottom sludge as a raw material. Using the sintered water body bottom sludge as a raw material, zeolite with multiple excellent properties can be prepared at low cost, and the resource utilization of sintered bottom sludge can be realized. It belongs to the technical field of environmental protection. Background technique [0002] The sediment of rivers, lakes and other water bodies is the accumulation site of organic chlorine compounds and heavy metals in the water ecosystem, and its concentration of pollutants is usually 4-8 orders of magnitude higher than that of river water. As an important part of the water ecosystem, the sediment is not only the living environment for benthic organisms, but also a source of river water pollution. Therefore, although "pollution interception" and "pollution control" can obviously control the "black and odorous" phenomenon of water bodies, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02B09B3/00C02F11/00
Inventor 吴德意何圣兵王欣泽孔海南
Owner SHANGHAI JIAO TONG UNIV
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