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Method for preparing kaolin from coal gangue

A technology of kaolin and coal gangue, which is applied in the field of preparing kaolin from coal gangue, can solve the problems of low quality and poor performance of kaolin, and achieve the effects of expanding application fields, increasing whiteness, and improving environmental conditions

Inactive Publication Date: 2016-06-22
张慧
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a method for preparing kaolin from coal gangue in order to solve the problems of poor performance and low quality of kaolin produced by calcining kaolin from existing coal gangue

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1, a method for preparing kaolin from coal gangue, the steps are as follows:

[0023] (1) Ore washing: washing to remove coal ash and soil on the surface of the raw ore, and then drying the surface water,

[0024] (2) Add 1% calcium oxide by mass, crush and pulverize together, use a conventional hammer crusher to crush the ore to a particle size of ≤15mm, and then use a hurricane mill to crush it so that the particle size does not exceed 100 microns;

[0025] (3) Suspension preheating, using 250 degrees Celsius hot nitrogen to heat the material by airflow suspension,

[0026] (4) Add 0.005% titanium dioxide to mix,

[0027] (5) Calcination, using an internal heating rotary kiln, the calcination temperature is controlled at 930°C, and the calcination is for 90 minutes. Gas gas is used for heating during the calcination. During the calcination process, titanium oxide and carbon molecules undergo a reduction reaction to generate metal monomer titanium.

[0028...

Embodiment 2

[0030] Embodiment 2, a method for preparing kaolin from coal gangue, the steps are as follows:

[0031] (1) Ore washing: washing to remove coal ash and soil on the surface of the raw ore, and then drying the surface water,

[0032] (2) Add 1.5% calcium oxide, crush and crush together, use a conventional hammer crusher to crush the ore to a particle size of ≤15mm, and then use a hurricane mill to crush it so that the particle size does not exceed 100 microns;

[0033] (3) Suspension preheating, using 300 degrees Celsius hot nitrogen to heat the material by airflow suspension,

[0034] (4) Add 0.006% titanium dioxide to mix,

[0035] (5) Calcination, using an internal heating rotary kiln, the calcination temperature is controlled at 980°C, and the calcination is for 80 minutes. Gas gas is used for heating during the calcination. During the calcination process, titanium oxide and carbon molecules undergo a reduction reaction to generate metal monomer titanium.

[0036] (6) Send...

Embodiment 3

[0038] Embodiment 3, a method for preparing kaolin from coal gangue, the steps are as follows:

[0039] (1) Ore washing: washing to remove coal ash and soil on the surface of the raw ore, and then drying the surface water,

[0040] (2) Add 2% calcium oxide, crush and crush together, use a conventional hammer crusher to crush the ore to a particle size of ≤15mm, and then use a hurricane mill to crush it so that the particle size does not exceed 100 microns;

[0041] (3) Suspension preheating, use 200 degrees Celsius hot nitrogen to heat the material by airflow suspension,

[0042] (4) Add 0.006% titanium dioxide to mix,

[0043] (5) Calcination, using an internal heating rotary kiln, the calcination temperature is controlled at 900°C, and the calcination is for 100 minutes. Gas gas is used for heating during the calcination. During the calcination process, titanium oxide and carbon molecules undergo a reduction reaction to generate metal monomer titanium.

[0044](6) Send nit...

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PUM

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Abstract

The invention belongs to the technical field of coal gangue treatment, and in particular relates to a method for preparing kaolin from coal gangue. To solve the problems of poor performance and low quality of kaolin produced by calcining kaolin from coal gangue, the steps include (1) ore washing: (2) adding calcium oxide, (3) suspension preheating, (4) adding titanium dioxide for mixing, (5) Calcination (6) Send nitrogen-oxygen mixed gas for cooling, and the oxygen content accounts for 5% of the total mass of the mixer. (7) Break up and classify: use a breaker to control the particle size of the materials in the silo to 1-2 μm. The kaolin processing process of the present invention is optimized, which solves the problem of insufficient whiteness of the product due to difficult carbon removal during the calcination process; only a small amount of high-quality titanium dioxide is added to improve the whiteness of the overall kaolin product.

Description

technical field [0001] The invention belongs to the technical field of coal gangue treatment, and in particular relates to a method for preparing kaolin from coal gangue. Background technique [0002] Kaolin minerals are composed of kaolinite, dickite, pearlite, halloysite and other kaolinite cluster minerals, and the main mineral component is kaolinite. [0003] The crystal chemical formula of kaolinite is 2SiO 2 .Al 2 o 3 .2H 2 O, whose theoretical chemical composition is 46.54% SiO 2 , 39.5% Al 2 o 3 , 13.96% H 2 O. China's kaolin mineral resources rank among the top in the world, with 267 proven mines and proven reserves of 2.910 billion tons. Among them: my country's non-coal-built kaolin resources rank fifth in the world. The proven reserves are 1.468 billion tons, mainly distributed The six provinces of Guangdong, Shaanxi, Fujian, Jiangxi, Hunan and Jiangsu account for 84.55% of the country's total reserves; the reserves of coal-bearing construction kaolin (ka...

Claims

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Application Information

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IPC IPC(8): C01B33/40
CPCC01B33/40C01P2004/61C01P2006/60C01P2006/80
Inventor 张慧
Owner 张慧
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