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Modified clay new material and preparation method thereof

A clay and new material technology, applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., can solve the problems of poor viscosity of modified clay and waste residue in the production process, etc.

Active Publication Date: 2011-06-15
于向真
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the disadvantages of poor viscosity of modified clay and waste residue in the production process in the prior art, and disclose a method of utilizing clay dealumination and converting its aluminum salt into pseudo-boehmite to form a high specific surface, large Modified clay material with pore volume of dealuminated clay closely combined with pseudo-boehmite or boehmite and preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Mix 100 grams of kaolin (produced by China Kaolin Industry Company) and 12 ml of concentrated sulfuric acid (98%, industrial grade) evenly, treat at 200 ° C for 3 hours, cool, add 400 ml of deionized water to stir and beat, and obtain dealuminated kaolin and sulfuric acid Add 145ml of sodium metaaluminate solution (the content of aluminum oxide is 330g / l, the molar ratio of sodium oxide to aluminum oxide is 1.5) under stirring for the mixed material of aluminum salt, measure the pH value to be 7.0, then heat up to 80°C for aging for 4 hours , the material was filtered, washed and filtered with 1000ml of deionized water for 4 times, and the filter cake was dried at 120°C for 12 hours to obtain sample A, which was analyzed and calculated to obtain its SiO 2 :Al 2 o 3 The molar ratio is 0.75, the pore volume is 0.23ml / g and the BET specific surface is 165m 2 / g.

Embodiment 2

[0029] 100 grams of kaolin (produced by China Kaolin Industry Company) and 400 ml of 10% hydrochloric acid were mixed evenly, and treated at 95°C for 4 hours to obtain a mixture of dealuminated kaolin and aluminum chloride salt, and 145 ml of partial Sodium aluminate solution (the content of alumina is 330g / l, the molar ratio of sodium oxide to alumina is 1.5), the measured pH value is 7.5, then the temperature is raised to 90°C for aging for 2 hours, the material is filtered, and washed 5 times with 1500ml deionized water Filter and dry the filter cake at 180°C for 4 hours to obtain sample B, analyze its composition and calculate its SiO 2 :Al 2 o 3 The molar ratio is 0.78, the pore volume is 0.45ml / g and the BET specific surface is 215m 2 / g.

Embodiment 3

[0031] 100 grams of roasted coal-based kaolin (produced by Inner Mongolia Chaopai Kaolin Co., Ltd.) and 570 ml of 12% hydrochloric acid were mixed uniformly, and processed at 90° C. for 2 hours to obtain a mixed material of dealuminated kaolin and aluminum chloride salt. Add 200ml of sodium metaaluminate solution (the content of aluminum oxide is 330g / l, and the molar ratio of sodium oxide to aluminum oxide is 1.5) and 300ml of sodium carbonate solution with a concentration of 20% (wt) under stirring, and measure the pH value to be 10.2, then heat up Aged at 85°C for 4 hours, filtered the material, washed and filtered with 1000ml of deionized water for 4 times, and dried the filter cake at 120°C for 12 hours to obtain sample C, which was analyzed and calculated to obtain its SiO 2 :Al 2 o 3 The molar ratio is 0.64, the pore volume is 0.65ml / g and the BET specific surface is 310m 2 / g.

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Abstract

The invention relates to a modified clay new material and a preparation method thereof. The new material is characterized in that the new material is a compound of dealuminated clay with large pore volume and high specific surface area and pseudo-boehmite or boehmite; the new material comprises the following main components: silicon oxide and aluminium oxide; the molar ratio of SiO2 to Al2O3 is (0.01-50):1; the BET specific surface area is 80-800m2 / g; and the low-temperature nitrogen absorption pore volume is 0.2-3.0ml / g. The preparation method comprises the following steps: firstly mixing the clay with certain amount of acids or alkalis to react at the temperature of 40-600 DEG C for 10 minutes to 48 hours to carry out dealuminizing to form a mixture of the clay and the aluminium salt, then adding 0-10% of pore-forming agents on dry basis to the mixture, mixing the mixture uniformly and carrying out a reaction on the mixture and alkaline substances or acidic substances, controlling the pH value to be 6-12, then raising the temperature to 50-200 DEG C for aging for 0.2-24 hours and drying the filter cake at the temperature of 60-500 DEG C after filtering and washing, thus obtaining the new material. The new material and the preparation method overcome the defects of poor viscosity of the modified clay, existence of waste residues in the production process and the like in the prior art.

Description

technical field [0001] The invention relates to a new modified clay material and a preparation method thereof, more precisely a combination of clay from which part of the alumina has been removed and pseudo-boehmite or boehmite, which can be used for the manufacture of catalysts, adsorption agent, dehydrating agent, etc. Background technique [0002] Clay is an important mineral raw material, which is composed of various hydrated silicates and a certain amount of alumina, alkali metal oxides and alkaline earth metal oxides, and contains impurities such as quartz, feldspar, mica and sulfate. The particles of clay minerals are small, often in the colloidal size range, in the form of crystals or amorphous, most of which are flakes, and a few are tubular and rod-shaped. Clay minerals have plasticity after being wetted with water, can be deformed under small pressure and can maintain their original shape for a long time, and have a large specific surface area, and the particles ...

Claims

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Application Information

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IPC IPC(8): B01J21/12B01J20/14B01J20/10B01J20/28B01J20/30
Inventor 于向真孙华磊
Owner 于向真
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