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A method for preparing ultra-high whiteness calcined kaolin from whole coal gangue

A technology for calcining kaolin and coal gangue, which is applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., and can solve unmanned and difficult problems

Active Publication Date: 2016-05-11
乌海市天宇高岭土高新科技有限公司
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  • Application Information

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Problems solved by technology

Because when the whiteness of calcined kaolin is above 93, it is extremely difficult to increase one whiteness unit.
[0004] Therefore, the industry has always hoped to use coal gangue as raw materials to produce calcined kaolin products with a whiteness of more than 95, but there are many difficulties, and no one has achieved it so far.

Method used

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  • A method for preparing ultra-high whiteness calcined kaolin from whole coal gangue
  • A method for preparing ultra-high whiteness calcined kaolin from whole coal gangue
  • A method for preparing ultra-high whiteness calcined kaolin from whole coal gangue

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Embodiment Construction

[0011] The present invention is mainly realized by using an ultra-long calcining kiln.

[0012] In the present invention, an ultra-long calcination kiln of 180.2m is adopted, and a flame-chambered calcination method is adopted. In the present invention, the calcination time can be extended to more than 6 hours from less than 2 hours of the conventional direct flame kiln or about 1.5 hours of the conventional muffled flame rotary kiln, which is beneficial to the removal of charcoal and organic matter in the structure and makes the product yellow. When the whiteness is stable at 3.0-3.5, the whiteness is as high as 95 or more.

[0013] In the present invention, the effective length of the super-long calcining kiln is 180m, and the materials are placed in the sagger and gradually calcined along with the kiln cars. = 72 pieces, one car is jacked in every half hour, then the total time for one kiln car from entering the kiln at the kiln head to exiting the kiln at the kiln tail = ...

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Abstract

The invention discloses a method for preparing ultra-high whiteness calcined kaolin by using completely coal gangue. The ultra-high whiteness is whiteness higher than 95. The method comprises the following step: a raw material completely composed of coal gangue is calcined for more than 6h under a temperature of 945-955 DEG C. With the method provided by the invention, whiteness of prepared calcined kaolin can be higher than 95, and abrasion value and 325-mesh sieve margin of the calcined kaolin are both lower than those of calcined kaolin produced with other methods. The method has high application value.

Description

technical field [0001] The invention belongs to the field of production methods of calcined kaolin. Background technique [0002] Calcined kaolin is a powdery filler widely used in coatings, papermaking, rubber and other fields. It is generally produced by crushing natural kaolin or natural kaolinite and then calcining. In the existing calcined kaolin production process, a mixture of natural hard kaolinite and coal gangue is generally used as a raw material. Among them, coal gangue belongs to the sedimentary coal-measure kaolin mine, which mainly exists in the roof and floor of the coal seam and the gangue of the coal seam. The coal-measure kaolin in my country is widely distributed, with large reserves and high grade, and has broad prospects for development and utilization. However, coal gangue has a dense structure, high hardness, high carbon content, low natural whiteness (natural whiteness is generally below 17%, or even completely black), and the associated volatiles s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/40
Inventor 安勇冯欲晓武占忠王超孙凯王钰生王蒙军闫海军陈林刘成俊张永栓马娜李济源高子敬李晓慧
Owner 乌海市天宇高岭土高新科技有限公司
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