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A kind of preparation method of high-purity halloysite

A halloysite, high-purity technology, applied in the direction of aluminum silicate, silicate, etc., to achieve the effect of convenient operation, high purity and simple process

Inactive Publication Date: 2011-12-14
CHINA UNIV OF GEOSCIENCES (WUHAN) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention successfully removes the gibbsite in the halloysite by adding the step of pickling, and further improves the purity of the halloysite to more than 95%, which has not been reported in China

Method used

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  • A kind of preparation method of high-purity halloysite
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  • A kind of preparation method of high-purity halloysite

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Embodiment 1

[0023] A kind of preparation method of high-purity halloysite, it comprises the steps:

[0024] 1) the natural halloysite raw ore (the main composition of natural halloysite comprising halloysite, kaolinite, illite, gibbsite, quartz and feldspar, with the mass percentage composition of halloysite being 50%, See figure 1 ) and water to form a suspension with a concentration of 20wt% (mass) (representing that 100g of suspension contains 20g of raw ore);

[0025] 2) According to the amount of sodium hexametaphosphate added as 0.2% of the raw ore mass, sodium hexametaphosphate was added to the suspension, and mechanically stirred for 3 hours to obtain a slurry;

[0026] 3) Put the stirred slurry into a centrifuge for centrifugation at a speed of 2000r / min for 10 minutes; after centrifugation, remove the lower sediment, take the upper suspension, and centrifuge again at a speed of 3800r / min for 10 minutes to obtain Sediment from the second centrifugation;

[0027] 4) Take the pr...

Embodiment 2

[0031] A kind of preparation method of high-purity halloysite, it comprises the steps:

[0032] 1) the natural halloysite raw ore (the main composition of natural halloysite comprising halloysite, kaolinite, illite, gibbsite, quartz and feldspar, with the mass percentage composition of halloysite being 40%, See figure 1 ) and water to form a suspension with a concentration of 15wt% (mass) (expressing 100g suspension containing 15g raw ore);

[0033] 2) According to the amount of sodium hexametaphosphate added as 0.3% of the raw ore mass, sodium hexametaphosphate was added to the suspension, and mechanically stirred for 2 hours to obtain a slurry;

[0034] 3) Put the stirred slurry into a centrifuge for centrifugation at a speed of 2000r / min for 5 minutes; after centrifugation, remove the lower sediment, take the upper suspension, and centrifuge again at a speed of 3000r / min for 5 minutes to obtain the first Sediment from secondary centrifugation;

[0035] 4) Take the second...

Embodiment 3

[0039] A kind of preparation method of high-purity halloysite, it comprises the steps:

[0040] 1) natural halloysite raw ore (the main composition of natural halloysite comprises halloysite, kaolinite, illite, gibbsite, quartz and feldspar, see figure 1 ) and water to form a suspension with a concentration of 10% (mass) (representing that 100g of suspension contains 10g of raw ore);

[0041] 2) According to the amount of sodium hexametaphosphate added to be 0.5% of the raw ore mass, sodium hexametaphosphate was added to the suspension, and mechanically stirred for 4 hours to obtain a slurry;

[0042] 3) Put the stirred slurry into a centrifuge for centrifugation at a speed of 1500r / min for 10 minutes; after centrifugation, remove the lower sediment, take the upper suspension, and centrifuge again at a speed of 3800r / min for 5 minutes to obtain the first Sediment from secondary centrifugation;

[0043] 4) Take the precipitate from the second centrifugation, dry at 80°C (dry...

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Abstract

The invention relates to a preparation method of high-purity halloysite, which belongs to the field of mineral deep processing. A preparation method of high-purity halloysite is characterized in that it comprises the steps of: 1) preparing a suspension with a concentration of 10-20wt% of raw ore and water with a mass percentage of halloysite of 30-50% ; 2) sodium hexametaphosphate is added to the suspension to obtain a slurry; 3) centrifugation, after centrifugation, the lower sediment is removed, and the upper suspension is taken and centrifuged again to obtain the second centrifugal precipitate; 4) The precipitate of the second centrifugation is dried at 80-100° C. to obtain the dried product for subsequent use; 5) take the dried product, according to the ratio of raw ore: hydrochloric acid mass ratio=1:30-1:70 , add concentrated hydrochloric acid to the dried product, stir in a water bath at 70-80°C for 1-10h; suction filter the stirred slurry, wash the solid with water until neutral, dry at 80-100°C to obtain high-purity halloy stone. The purity of the halloysite prepared by the method is greater than 95%.

Description

technical field [0001] The invention relates to a preparation method of high-purity halloysite, which belongs to the field of mineral deep processing. technical background [0002] Halloysite (chemical composition is Al 4 [Si 4 o 10 ](OH) 8 4H 2 O), belonging to the kaolinite family, is also known as multi-water kaolinite because of the interlayer water. Under the electron microscope, the halloysite tube has an outer diameter of 10-50nm, an inner diameter of 5-20nm, a length of 2-40μm, and a number of crystal layers of 15-40. It has nano-effects in at least one dimension and has a high specific surface area. and highly negatively charged outer surface, for natural nanotubular minerals. Halloysite not only has excellent characteristics such as low density and high strength, but also has the characteristics of no staining on the substrate, good compatibility, and obvious modification effect. It is an ideal ultra-thin fine ceramic and petroleum catalyst carrier with pract...

Claims

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Application Information

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IPC IPC(8): C01B33/26
Inventor 舒国晶严春杰肖国琪周春宇郝佳瑞袁六四夏云山
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)