Method for preparing modification forming magnalium hydrotalcite and application

A magnesium-aluminum hydrotalcite and modification technology, which is applied to the preparation and application field of modified magnesium-aluminum hydrotalcite, can solve the problems of poor treatment effect of inorganic pollutants such as phosphorus and nitrogen, and solve the problem of poor treatment effect of phosphorus and nitrogen. Excellent, strong adsorption effect, easy separation effect

Inactive Publication Date: 2009-03-18
OCEAN UNIV OF CHINA
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  • Abstract
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  • Claims
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Problems solved by technology

At present, more than 80% of my country's urban sewage treatment plants are mainly based on flocculation sedimentation and biological methods, and the treatment effect

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  • Method for preparing modification forming magnalium hydrotalcite and application

Examples

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Comparison scheme
Effect test

Embodiment 1

[0009] Preparation method of modified magnesium aluminum hydrotalcite

[0010] 3000mol of MgSO 4 and 500mol of Al 2 (SO 4 ) 3 Prepared into mixed brine solution (the total amount is 4.0m 3 ), the NaOH of 5000mol and the Na of 10000mol 2 CO 3 Mixed alkali aqueous solution (the total amount is 4.0m 3 ), put the two aqueous solutions into the fully mixed jet reactor through the pipeline, and react under the condition of controlling the pH value at 8-9 to obtain a milky white slurry, which is directly added to the aging tank and kept stirring After the reaction is complete, seal the aging tank, heat to 130°C, and keep the temperature at (130±5)°C, crystallize for 24 hours, then add the crystallized material to a plate and frame filter press, wash with tap water until the filtrate At this time, the pH value of the filtrate was 7. Finally, the washed substance was spray-dried, and the inlet and outlet temperatures of the spray drying tower were kept at 300°C and 120°C respect...

Embodiment 2

[0013] Removal of PO in aqueous solution by unmodified and modified magnesium aluminum hydrotalcites 4 3- ,P 3 o 10 5- , NO 3 - , NO 2 -

[0014] The unmodified and modified magnesium aluminum hydrotalcite prepared in Example 1 were respectively loaded into the adsorption column according to the diameter-to-height ratio of 1.1:10, and the PO in the aqueous solution was adsorbed and removed respectively. 4 3- ,P 3 o 10 5- , NO 3 - , NO 2 - , their respective initial concentrations are calculated in terms of phosphorus or nitrogen, which are 50 mg / L, and the flow rate of the aqueous solution to pass through the adsorption column is controlled to be 5 mL / min. According to the first-level standard of the national comprehensive sewage discharge standard, the first-level standard of the national drinking water source water quality and the groundwater quality standard, the concentration of phosphorus in the aqueous solution after adsorption is 0.5mg / L, the concentrati...

Embodiment 3

[0019] Simultaneous removal of PO in aqueous solution by modified magnesium aluminum hydrotalcite 4 3- ,P 3 o 10 5- , NO 3 - , NO 2 - The modified magnesium aluminum hydrotalcite obtained in Example 1 is loaded into the adsorption column according to the diameter-to-height ratio of 1.1:15, and the PO in the aqueous solution is removed simultaneously. 4 3- ,P 3 o 10 5- , NO 3 - , NO 2 - , and their respective initial concentrations are calculated as phosphorus or nitrogen, both are 25mg / L, and the flow rate of the aqueous solution through the adsorption column is controlled to be 5mL / min. The breakthrough concentration of each ion is as described in Example 2, to obtain PO 4 3- ,P 3 o 10 5- , NO 2 - The breakthrough time is 95, 75, 75min, while NO 3 -Has not penetrated within 300min. It can be seen that the modified magnesium aluminum hydrotalcite can remove PO in the aqueous solution at the same time. 4 3- ,P 3 o 10 5- , NO 3 - , NO 2 - . Due...

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Abstract

The invention discloses a preparation method of a modified and molded Mg-Al hydrotalcite and the application thereof. When in preparation, a mixed saline solution and a mixed aqueous alkali, containing Mg<2+> and Al<3+>, are respectively prepared and then mixed. Aging and crystallization are carried out after complete reaction, and the Mg-Al hydrotalcite is obtained after filtration, washing and drying; the Mg-Al hydrotalcite and a bonding agent are added into a magnesium saline solution and the pH value of the obtained paste is adjusted. After reaction, centrifugal separation, drying and extrusion molding are carried out, and then the paste is dried, roasted and cooled to the room temperature. When in adsorption and ion exchange, the product of the invention does not block a bed body and is easy for separation after reaction, suitable for the treatment of phosphorus and nitrogen anions in aqueous solution, water of a sewage disposal plant, seawater and breeding wastewater. A good treatment effect is available and an effluent standard can be met. Furthermore, after use, the product has better absorption effects after desorption and regeneration, thereby being beneficial to the realization of industrialized application.

Description

technical field [0001] The invention relates to a preparation method and application of modified magnesium aluminum hydrotalcite. Background technique [0002] The hydrotalcite that exists in nature is a hydroxycarbonate of magnesium and aluminum, also known as magnesium aluminum hydrotalcite, and its theoretical molecular formula is Mg 6 al 2 (OH) 16 (CO 3 )·4H 2 O. Magnesium aluminum hydrotalcite is an anionic layered compound with unique anion exchangeability, cation compatibility and large specific surface area, and plays an important role in adsorption, ion exchange and catalysis. However, the current research and application of magnesium aluminum hydrotalcite is mainly limited to the powder form. There are problems such as solid suspended solids are easy to block the bed, difficult to separate after reaction, and regeneration cannot be achieved. limit. Therefore, in order to realize the practical application of magnesium aluminum hydrotalcite in adsorption and i...

Claims

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Application Information

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IPC IPC(8): C01G1/00
Inventor 邢坤王海增李晓玉于艳伟
Owner OCEAN UNIV OF CHINA
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