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Preparation method of high-purity halloysite

A halloysite, high-purity technology, applied in the direction of aluminum silicate, silicate, etc., can solve the problem of difficult halloysite sorting, and achieve the best separation effect, low preparation cost and high purity.

Inactive Publication Date: 2010-05-12
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because halloysite, kaolinite, and illite belong to clay minerals, and their physical and chemical properties are very close, it is difficult to separate halloysite through current conventional beneficiation methods to obtain high-purity halloysite

Method used

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  • Preparation method of high-purity halloysite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of preparation method of high-purity halloysite, it comprises the steps:

[0023] 1) raw ore with a halloysite content greater than 30% (mass) (such as natural kaolin, mainly including halloysite, kaolinite, illite, gibbsite, quartz, feldspar, see figure 1 ) and water to form a suspension with a concentration of 5% (mass) (representing that 100g of suspension contains 5g of raw ore);

[0024] 2) The addition of anhydrous sodium carbonate is 0.1% of the quality of the suspension, and anhydrous sodium carbonate is selected for subsequent use; the addition of sodium hexametaphosphate is 0.2% of the raw ore quality, and sodium hexametaphosphate is selected for subsequent use;

[0025] Add anhydrous sodium carbonate and sodium hexametaphosphate to the suspension, and mechanically stir for 20 minutes to obtain a slurry;

[0026] 3) Put the stirred slurry into a centrifuge for centrifugation at a speed of 1000r / min for 3 minutes; after centrifugation, remove the lower ...

Embodiment 2

[0029] A kind of preparation method of high-purity halloysite, it comprises the steps:

[0030] 1) raw ore with a halloysite content greater than 30% (mass) (such as natural kaolin, mainly including halloysite, kaolinite, illite, gibbsite, quartz, 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);

[0031] 2) The addition of anhydrous sodium carbonate is 0.3% of the quality of the suspension, select anhydrous sodium carbonate for subsequent use; the addition of low molecular weight sodium polyacrylate (molecular weight is 3000~5000) is 0.1% of the raw ore quality, select Low molecular weight sodium polyacrylate, spare;

[0032] Add anhydrous sodium carbonate to the suspension, then add low-molecular-weight sodium polyacrylate to the suspension, and stir mechanically for 20-40 minutes to obtain a slurry;

[0033] 3) Put the stirred slurry into a centrifuge for centrifugatio...

Embodiment 3

[0036] A kind of preparation method of high-purity halloysite, it comprises the steps:

[0037] 1) raw ore with a halloysite content greater than 30% (mass) (such as natural kaolin, mainly including halloysite, kaolinite, illite, gibbsite, quartz, feldspar, see figure 1 ) and water are made into a suspension with a concentration of 8% (mass) (expressing that 100g of suspension contains 8g of raw ore);

[0038] 2) The addition of anhydrous sodium carbonate is 0.2% of the quality of the suspension, and anhydrous sodium carbonate is selected for subsequent use; the addition of sodium hexametaphosphate is 0.5% of the raw ore quality, and sodium hexametaphosphate is selected for subsequent use;

[0039] Add anhydrous sodium carbonate to the suspension, then add sodium hexametaphosphate to the suspension, and stir mechanically for 30 minutes to obtain a slurry;

[0040] 3) Put the stirred slurry into a centrifuge for centrifugation at a speed of 1200r / min for 4 minutes; after centr...

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Abstract

The invention relates to a preparation method of high-purity halloysite, belonging to the field of mineral intensive processing. The preparation method of the high-purity halloysite is characterized by including the following steps: 1) blending raw ore with halloysite content being more than 30% (mass) with water into 5-10% (mass) suspending liquid; 2) according to the adding amount of anhydrous sodium carbonate being 0.1-0.3% of the mass of the suspending liquid, selecting the anhydrous sodium carbonate for later use; adding the anhydrous sodium carbonate to the suspending liquid, then adding sodium hexametaphosphate or sodium polyacrylate with low molecular weight to the suspending liquid, and mechanically agitating for 20-40min to obtain slurry; 3) putting the slurry after agitating into a centrifugal machine for centrifugal separation, with the rotating speed of 1000-1500r / min, and the time of 3-5min; and after centrifugation, removing sediment at a lower layer, taking the suspending liquid at an upper layer, and recentrifuging, with the rotating speed of 2500-3000r / min, and the time of 3-5min; and 4) taking the sediment generated in recentrifuging, and drying at the temperature of 105 DEG C to obtain the high-purity halloysite. The halloysite obtained by using the preparation method has high purity.

Description

technical field [0001] The invention relates to a preparation method (purification method) of high-purity halloysite, which belongs to the field of mineral deep processing. technical background [0002] Halloysite is a hydrous layered silicate mineral in the monoclinic system. The crystal structure is similar to kaolinite, and it also belongs to the 2-octahedral structure of the 1:1 structural unit layer. The chemical composition is Al 4 [Si 4 o 10 ](OH) 8 4H 2 O, the same as kaolinite, but contains water between the layers, so it is also called multi-water kaolinite. Water molecules are easy to lose, and after all the loss, it is called halloysite, which is homogeneous and multi-like with kaolinite. In some monographs on clay mineralogy, minerals such as halloysite, kaolinite, dickite and nacrite are collectively referred to as "kaolinite group", commonly known as kaolin. [0003] Halloysite is generally formed by curling multiple sheets. The outer diameter of the tub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/26
Inventor 韩利雄严春杰肖国琪
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)