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Method for preparing attapulgite by in-situ crystal transformation of attapulgite

A technology for the transformation of attapulgite and crystal forms, which is applied in the fields of chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problem of the transformation from one-dimensional nano-attapulgite to two-dimensional silicate minerals, and achieve The effect of stable product quality, broad application prospects, and easy control of the process

Active Publication Date: 2015-08-19
中国科学院兰州化学物理研究所盱眙凹土应用技术研发中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the published solvothermal or hydrothermal reaction conditions, there is no report on the transformation of one-dimensional nano-attapulgite to two-dimensional silicate minerals.

Method used

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  • Method for preparing attapulgite by in-situ crystal transformation of attapulgite
  • Method for preparing attapulgite by in-situ crystal transformation of attapulgite
  • Method for preparing attapulgite by in-situ crystal transformation of attapulgite

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Example 1: Dissolve 0.03 g of sodium hydroxide in 600 mL of distilled water, add 3 g of attapulgite, mechanically stir for 30 minutes and disperse evenly, then place it in a 1 L adjustable pressure reactor, and react at a pressure of 4 MPa and a temperature of 180 ℃. h. After natural cooling, separate, dry, and pulverize through a 200-mesh sieve to obtain attapulgite containing 13% attapulgite.

Embodiment 2

[0018] Example 2: Dissolve 4 g of sodium carbonate in 600 mL of distilled water, add 24 g of attapulgite, mechanically stir for 30 min to disperse uniformly, place it in a 1 L adjustable pressure reactor, and react for 48 h at a pressure of 3 MPa and a temperature of 140 ℃. After natural cooling, separation, drying, and crushing through a 200-mesh sieve to obtain attapulgite containing 6% of attapulgite.

Embodiment 3

[0019] Example 3: Dissolve 1 g of potassium carbonate and 0.5 g of sodium hydroxide in 600 mL of distilled water, add 6 g of attapulgite, mechanically stir for 30 min and disperse uniformly, then place them in a 1 L adjustable pressure-resistant reactor at a pressure of 3 MPa and temperature Reacted at 180 ℃ for 24 hours, after natural cooling, separated, dried, and crushed through a 200-mesh sieve to obtain attapulgite containing 11% attapulgite.

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Abstract

The invention discloses a method for preparing attapulgite-montmorillonite through in-situ crystal transformation of attapulgite. The method comprises the steps of dispersing attapulgite into aqueous alkali in a solid-to-liquid ratio of 1:200-1:25, delivering the mixture into a pressure-resistant reaction kettle, reacting for 6-48h at 140 DEG C-220 DEG C under the pressure of 2.0-4.0MPa, and separating, drying and crushing to obtain the attapulgite-montmorillonite with a rodlike attapulgite-sheetlike montmorillonite dual structure. The attapulgite-montmorillonite has double properties of the attapulgite and the montmorillonite, the preparation method is simple, the morphology is controllable, and the attapulgite-montmorillonite can serve as high-efficiency adsorbent for substances such as heavy metal ions, dyes and mycotoxin.

Description

technical field [0001] The invention relates to a method for preparing attapulgite by in-situ crystal transformation of attapulgite, and belongs to the technical fields of deep processing of natural nanometer non-metallic minerals and synthesis of silicate minerals. Background technique [0002] Attapulgite clay (also known as palygorskite) is a hydrous magnesium-rich aluminosilicate clay mineral with attapulgite as the main component. Due to its special nanorod crystal and nanopore structure, it has excellent colloidal, adsorption and composite material reinforcement properties, and plays an important role in the field of modern chemistry and materials. In order to improve the performance of attapulgite, Chinese patents disclose various physical, chemical or physical-chemical modification methods. For example, patent CN102476805B discloses using the method of roller-freezing to improve the dispersibility of attapulgite, and then improve the colloid performance; Cooperate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/40
Inventor 王文波王爱勤康玉茹牟斌杨效和
Owner 中国科学院兰州化学物理研究所盱眙凹土应用技术研发中心