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Method for preparing column-supporting montmorillonite controlled release material and its use

A technology for pillared montmorillonite and controlled release material, which is applied in the field of preparation of pillared montmorillonite controlled release material, can solve the problems of long reaction time, low yield, difficult application and the like, achieves strong anti-leaching ability, High-yield, easy-to-achieve results

Inactive Publication Date: 2004-01-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They all use the "micro-dropping method" process, which is characterized in that the base is added dropwise to AlCl at a very low rate (about 1-2mL / min) in the preparation of the columnar agent. 3 solution; in the intercalation reaction, the columnizing agent is also dropped into the montmorillonite suspension at a very low rate (about 1-2mL / min); in addition, in order to make the intercalation reaction go smoothly, the montmorillonite suspension The concentration needs to be very dilute (for example, 4.5g / L), so the process of "micro-dropping method" makes the reaction time of the whole reaction long and the yield is very low. It is only suitable for a small amount of preparation in the laboratory and is difficult to apply in industrial production.

Method used

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  • Method for preparing column-supporting montmorillonite controlled release material and its use
  • Method for preparing column-supporting montmorillonite controlled release material and its use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation method of the polyhydroxyaluminum pillared montmorillonite controlled release material is as follows:

[0029] (1) After the montmorillonite ore that is the monovalent cation Na between the layers is crushed through a 200 mesh sieve, add water to make a concentration of montmorillonite suspension of 100g / L, that is, the mass ratio of montmorillonite to water is 1: 10.

[0030] (2) Preparation of polyhydroxyaluminum columnizer: by molar ratio [OH] - / [Al] 3+ =2.2 ratio, the concentration of 50mL is 2.0mol / L of AlCl 3 The aqueous solution and the corresponding volume of NaOH solution with a concentration of 1.0mol / L were placed in a large beaker together, and stirred continuously at 60°C for 2 hours; then the reaction solution was moved into an ultrasonic scrubber with a frequency of 50KHz, and treated with ultrasonic waves for 20 minutes; after the ultrasonic treatment, put the above reaction system in a constant temperature water bath at a temperature...

Embodiment 2

[0036] The preparation method of the polyhydroxyaluminum pillared montmorillonite controlled release material is as follows:

[0037] (1) After the montmorillonite ore that is the divalent cation Ca in the interlayer is crushed through a 200 mesh sieve, add water to make a concentration of montmorillonite suspension of 100g / L, that is, the mass ratio of montmorillonite to water is 1: 10.

[0038] (2) Preparation of polyhydroxyaluminum columnizer: by molar ratio [OH] - / [Al] 3+ =2.2 ratio, the concentration of 50mL is 2.0mol / L of AlCl 3 The aqueous solution and the corresponding volume of NaOH solution with a concentration of 1.0mol / L were placed in a large beaker together, and stirred continuously at 60°C for 2 hours; then the reaction solution was moved into an ultrasonic scrubber with a frequency of 50KHz, and treated with ultrasonic waves for 20 minutes; after the ultrasonic treatment, put the above reaction system in a constant temperature water bath at a temperature of...

Embodiment 3

[0044] The preparation method of polyhydroxyphosphorus aluminum pillared montmorillonite controlled release material is as follows:

[0045] The difference between this preparation method and Example 1 or 2 is that the columnizing agent prepared in step (2) is a polyhydroxyphosphorus aluminum columnizing agent, and its preparation process is: in molar ratio [H 2 PO 4 ] - / [Al] 3+ =2.2 ratio, the concentration of 50mL is 2.0mol / L of AlCl 3 Aqueous solution and corresponding volume of KH with a concentration of 1.0mol / L 2 PO 4 The solutions were placed together in a large beaker and stirred continuously at 60°C for 2 hours; then the reaction solution was moved into an ultrasonic scrubber with a frequency of 50KHz, and treated with ultrasonic waves for 20 minutes; after the ultrasonic treatment, the above reaction system was placed in aging for 2 days in a constant temperature water bath at a temperature between 60 and 70° C. to obtain a polyhydroxyphosphorus aluminum column...

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Abstract

The preparation method of column-supported montmorillonite controlled release material includes the following steps: preparing montmorillonite suspension liquor; preparing column-forming agent; making intercalation reaction between them; ageing and drying; in the inter calation reaction mixing the column-forming agent and montmorillonite suspension liquor according to the ratio of column-forming agent; montmorillonite=0.5-1.5 mmol: 1g; stirring them for 0.5-1 hr. at 60-80 deg.C, then treating by ultrasonic wave and in microwave field making them continuously react. Said material can be used for producing controlled release fertilizer.

Description

technical field [0001] The invention relates to controlled-release material technology, in particular to a preparation method of pillared montmorillonite controlled-release material and its application in controlled-release fertilizers. Background technique [0002] Controlled-release fertilizer is a new type of fertilizer with high technical content that can adjust the nutrient ratio and nutrient release rate. Its nutrient release rate can be regulated by physical, chemical and biotechnological means to achieve two-way regulation of accelerated release or slow release. The supply of nutrient elements in the fertilizer is basically synchronized with the nutrient demand of the crops to achieve a dynamic balance. The development and selection of controlled-release materials is the key to the development of controlled-release fertilizer technology. At present, the widely used controlled-release materials are mainly some polymers such as synthetic re...

Claims

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Application Information

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IPC IPC(8): C01B33/20C05G3/00
Inventor 吴平霄廖宗文冯新
Owner SOUTH CHINA UNIV OF TECH
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