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Method for preparing 1.1 nm tobermorite from low-grade attapulgite clay

A technology of attapulgite clay and tobermullite, which is applied in the direction of aluminum silicate, silicate, nanotechnology, etc., can solve the problems of performance improvement, complicated purification process, and high cost, and achieve uniform particle size and simple preparation process , Good product stability

Active Publication Date: 2017-01-11
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the purification process can reduce the miscellaneous ore content to a certain extent, increase the purity of attapulgite, and improve the performance, the purification process is complex, costly, consumes water and energy, and the use of activators can also cause environmental pollution.
Therefore, for low-grade attapulgite clay, it is difficult to significantly improve its performance by conventional purification and modification methods.

Method used

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  • Method for preparing 1.1 nm tobermorite from low-grade attapulgite clay
  • Method for preparing 1.1 nm tobermorite from low-grade attapulgite clay

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Example 1: Disperse 100 g of attapulgite clay powder into 300 mL of an aqueous solution containing 50 g of sodium silicate under mechanical stirring to form a uniform suspension A; dissolve 100 g of calcium chloride in 200 mL of water to form a uniform Solution B; under stirring, slowly add solution B to suspension A to obtain a precursor suspension; then transfer the precursor suspension into a 1L hydrothermal reaction kettle, seal it, and store it at a temperature of 230°C, a pressure of 3MPa, and a pH The reaction was carried out under the condition of 14 for 5 h, and the temperature was naturally cooled to room temperature; the product was centrifuged and washed thoroughly, dried to constant weight, and ground to obtain a white 1.1 nm tobermullite powder. The product can adsorb 142.3 mg / g of Cd(II) ion, 231 mg / g of tetracycline and 192 mg / g of methylene blue.

Embodiment 2

[0020] Example 2: Disperse 10 g of attapulgite clay powder into 300 mL of an aqueous solution containing 80 g of sodium silicate under mechanical stirring to form a uniform suspension A; dissolve 100 g of calcium nitrate in 200 mL of water to form a uniform solution B; under stirring, slowly add the B solution to the suspension A to obtain the precursor suspension; then transfer the precursor suspension into a 1L hydrothermal reaction kettle, seal it, and heat it at a temperature of 140°C, a pressure of 3MPa, and a pH of 14 The reaction was carried out for 36 h under certain conditions, and the temperature was naturally lowered to room temperature; the product was centrifuged and washed thoroughly, dried to constant weight, and ground to obtain a white 1.1 nm tobermullite powder. The product can adsorb Zn(II) ion at 164.6 mg / g, tetracycline at 243 mg / g, and methylene blue at 216 mg / g.

Embodiment 3

[0021] Example 3: Disperse 50 g of attapulgite clay powder into 300 mL of an aqueous solution containing 50 g of sodium potassium silicate under mechanical stirring to form a uniform suspension A; disperse 100 g of calcium bicarbonate in 200 mL of water to form Homogeneous solution B; under stirring, slowly add solution B to suspension A to obtain a precursor suspension; then transfer the precursor suspension into a 1L hydrothermal reaction kettle, seal it, and store it at a temperature of 230°C and a pressure of 3MPa. The reaction was carried out at pH 10 for 24 hours, and the temperature was naturally cooled to room temperature; the product was centrifuged and washed thoroughly, dried to constant weight, and ground to obtain a white 1.1 nm tobermullite powder. The product can adsorb Cu(II) ions at 186.3 mg / g, tetracycline at 226 mg / g, and methylene blue at 246 mg / g.

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Abstract

The invention discloses a method for preparing 1.1 nm tobermorite from low-grade attapulgite clay. The method comprises steps as follows: low-grade attapulgite clay minerals are smashed, 150-300-mesh powder is obtained and dispersed in an aqueous silicate solution, a mixed solution is subjected to microwave activation for 5-10 min, and a stable suspension liquid A is formed; calcium salt is dispersed in water, and a uniform dispersion liquid B is formed; the dispersion liquid B is slowly added to the suspension liquid A during fast stirring and is sufficiently and uniformly mixed, and a precursor suspension liquid is obtained; the precursor suspension liquid is transferred into a hydrothermal reaction kettle to be subjected to a hydrothermal reaction, and then is cooled to the room temperature; solid products are separated, washed, dried and smashed, and the 1.1 nm tobermorite is obtained. According to the method, components of the attapulgite clay are subjected to the chemical reaction with silicon salt and calcium salt in a hydrothermal process, so that a crystal form is converted and recombined, the 1.1 nm tobermorite with good stability and uniform granularity is formed, and a product is good in uniformity, stable in performance and applied to adsorbents for substances such as heavy metals, dyes, antibiotics and the like.

Description

technical field [0001] The invention relates to a method for preparing 1.1nm tobermullite by using low-grade attapulgite clay, and belongs to the technical field of deep processing of non-metallic ores and preparation of nanometer materials. Background technique [0002] Attapulgite clay is a kind of hydrated magnesium-aluminosilicate clay mineral with attapulgite as the main component. Due to its nano-rod crystal morphology and rich nano-pores, it has been used in composite materials, fine chemicals, and functional carriers in recent years. , petrochemical and environmental protection and other fields have been widely used. Attapulgite clay resources are abundant in China. Large-scale high-quality attapulgite clay deposits were first discovered in the Jiangsu and Anhui regions. In recent years, a large number of deposits (points) have also been discovered in Gansu, Inner Mongolia, Sichuan, Shanxi, Hebei, and Yunnan. Due to the common isomorphic substitution of cations at t...

Claims

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Application Information

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IPC IPC(8): C01B33/26B82Y40/00
CPCC01B33/26C01P2002/72C01P2004/03C01P2004/64
Inventor 王文波王爱勤田光燕康玉茹汪琴宗莉牟斌
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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