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Method for whitening pencil stone powder

A technology of pyrophyllite powder and pyrophyllite, which is applied in the direction of aluminum silicate and silicate, can solve the problems of narrow application fields, low product grades, and low added value, and achieve simple operation, improved whiteness, and broadened applications field effect

Inactive Publication Date: 2010-12-22
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems that the existing pyrophyllite minerals have narrow application fields, low product grades, and low added value due to their low whiteness, the purpose of the inventors is to provide a method for whitening pyrophyllite powder. The implementation can obtain higher quality pyrophyllite products, and broaden the utilization ways of pyrophyllite minerals

Method used

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  • Method for whitening pencil stone powder

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Experimental program
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Effect test

Embodiment 1

[0028] Mix 50g of pyrophyllite raw ore powder (75% whiteness, 100 mesh) with 10g of ammonium chloride (chemically pure, the same below), grind it evenly, pour it into a corundum crucible, put the crucible into a muffle furnace Raise the temperature to 900°C, calcined at 900°C for 1 hour, take it out, and cool it to obtain the primary calcined product, whose whiteness was measured to be 83%; then add 10g of ammonium chloride to the primary calcined product, grind it evenly, and pour it into a corundum crucible , put the crucible into a muffle furnace and heat up to 900°C with the furnace, and secondarily calcined at 900°C for 1 hour, took it out, cooled to get a second calcined product, measured its whiteness as 87%, and obtained the desired product after grinding.

Embodiment 2

[0030] Mix 50g of pyrophyllite raw ore powder (71% whiteness, 325 mesh) with 7g of ammonium chloride, grind it evenly, pour it into a corundum crucible, put the crucible into a muffle furnace, and heat up to 900°C with the furnace. Calcined at ℃ for 2 hours, took it out, cooled to obtain the primary calcined product, and measured its whiteness as 81%; then added 5g of ammonium chloride to the primary calcined product and mixed it, ground it evenly, poured it into a corundum crucible, and put the crucible into a muffle In the furnace, the temperature was raised to 900°C, and then calcined at 900°C for 2 hours, taken out, cooled to obtain a secondary calcined product, and its whiteness was measured to be 86%. After grinding, the desired product was obtained.

Embodiment 3

[0032] Mix 50g of pyrophyllite raw ore powder (71% whiteness, 600 mesh) with 2.5g of ammonium chloride, grind it evenly, pour it into a corundum crucible, put the crucible into a muffle furnace, and heat up to 900°C with the furnace. Calcined at 900°C for 5 hours, took it out, cooled to obtain the primary calcined product, and measured its whiteness as 80%; then added 2.5g of ammonium chloride to the primary calcined product and mixed it, ground it evenly, poured it into a corundum crucible, and put the crucible into In the muffle furnace, the temperature was raised to 900° C., and then calcined at 900° C. for 5 hours, taken out, and cooled to obtain a secondary calcined product. The whiteness was measured to be 88%, and the desired product was obtained after grinding.

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Abstract

The invention discloses a method for whitening pyrophyllite powder. The method comprises the following steps: mixing crude ore pyrophyllite powder with ammonium chloride according to the weight ratio of 5-20: 1; calcining the mixture for 1 to 5 hours after even grinding; and obtaining the whitened pyrophyllite powder after cooling and fine grinding. The method can improve the whiteness of the pyrophyllite powder to above 85 percent, thereby obtaining the pyrophyllite product with higher quality and widening the application field of the pyrophyllite mineral. In addition, new impurity element components can not be introduced during the preparation of the products. The method has simple operation and is suitable for industrialized production.

Description

(1) Technical field [0001] The invention belongs to the field of material chemical industry, and in particular relates to a method for whitening pyrophyllite powder. (2) Background technology [0002] Pyrophyllite is a hydrous aluminum silicate with a crystal structure and a layered silicate mineral with a theoretical chemical composition of Al 2 o 3 28.3%, SiO 2 66.7%, H 2 O 5.0%, mainly composed of quartz, kaolinite and sericite. The molecular layers of pyrophyllite are easy to slide and cause creep, low hardness, soft and greasy, and good machining performance; the powder color is white, with high oil absorption rate and good covering rate, etc. It is mainly used as refractory materials and ceramic materials And engraving raw materials; secondly, it is also used as filler and carrier for rubber products, cosmetics, pesticides, etc. The new use of pyrophyllite is as a coating, and it is also a good raw material for making siding, and it can also be used to make whit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/26
Inventor 盛嘉伟
Owner ZHEJIANG UNIV OF TECH
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