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Coal series kaolinite rock calcining method capable of reducing calcining temperature

A technology of calcining temperature and calcining kaolin, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as difficulty in maintaining kaolinite crystal form intact, failure to ensure kaolinite activity, and environmental pollution, etc., to achieve Low production cost, good calcination effect, and pollution reduction effect

Inactive Publication Date: 2013-09-11
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The energy consumption of the methods adopted in the above-mentioned patents is relatively high, and the crystal form of kaolinite is difficult to keep intact, the activity of kaolinite cannot be guaranteed, and the pollution to the environment is serious.
So far, no calcination method has been found that can reduce energy consumption and increase the activity of coal-based kaolin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Coal-measure kaolinite is pulverized and put into a stirring tank together with water and potassium acetate, and mixed evenly to obtain intercalation compound slurry; the intercalation compound slurry is centrifuged to obtain intercalation compound binder and intercalation compound slurry. agent solution; put the intercalation compound binder into the calciner, raise the temperature to 350°C, keep the temperature for 2 hours, then raise the temperature to 600°C and keep the temperature for 1 hour. The calcined coal-series kaolinite is taken out, washed and filtered, and the filtered coal-series kaolinite is made into a slurry, which is spray-dried to obtain a finished high-activity ultra-fine calcined kaolin. The hexagonal flaky kaolinite crystals account for 20% of the finished kaolinite, the particle size D97=2μm, the wafer thickness is less than 200nm, and the whiteness is 90%.

Embodiment 2

[0047] The coal-measure kaolinite is pulverized and put into the stirring tank together with water and potassium chloride, and mixed evenly to obtain the intercalation compound slurry; the intercalation compound slurry is centrifuged to obtain the intercalation compound sticky material and the intercalation compound slurry. Layer agent solution: Put the intercalation compound binder into the calciner, raise the temperature to 450°C, keep the temperature constant for 2.5h, then raise the temperature to 700°C and keep the temperature constant for 0.5h. The calcined coal-measure kaolin is taken out, washed and filtered, and the filtered coal-measure kaolin is made into a slurry, which is spray-dried to obtain a finished calcined kaolin. The hexagonal flaky kaolinite crystals account for 30% of the finished kaolinite, the particle size D97=2μm, the wafer thickness is less than 200nm, and the whiteness is 91%.

Embodiment 3

[0049] Coal-measure kaolinite is pulverized and put into a stirring tank together with water and potassium bromide, and mixed evenly to obtain intercalation compound slurry, wherein the mass ratio of coal-measure kaolinite to water is 1:5, and the coal-measure kaolin The mass ratio of rock to potassium bromide is 1:0.30. Centrifuge the intercalation compound slurry to obtain the intercalation compound binder and the intercalation agent solution; put the intercalation compound binder into the calciner, raise the temperature to 350°C, keep the temperature for 2.5 hours, and then raise the temperature to 600°C and constant temperature for 0.5h. The calcined coal-measure kaolin is taken out, washed and filtered, and the filtered coal-measure kaolin is made into a slurry, which is spray-dried to obtain a finished calcined kaolin. The hexagonal flaky kaolinite crystals account for 30% of the finished kaolinite, the particle size D97=1.9μm, the wafer thickness is less than 200nm, an...

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Abstract

The invention belongs to the field of comprehensive utilization of coal series kaolinite rock, and in particular relates to a coal series kaolinite rock calcining method capable of reducing calcining temperature. The calcining method comprises the following steps of: mixing crushed coal series kaolinite rock with water and sylvite to obtain an intercalation composite slurry; centrifugally separating the intercalation composite slurry to obtain an intercalation composite binder and intercalator solution; putting the intercalation composite binder into a calcining furnace, raising the temperature to 350-450 DEG C, keeping the temperature constant for 2-2.5 hours, then raising the temperature to 600-700 DEG C, and then keeping the temperature for 0.5-1 hour; washing and filtering; preparing the filtered coal series kaolinite rock into slurry, and performing spray drying to obtain a finished superfine calcined kaolin product. The calcining method provided by the invention reduces energy consumption, and the calcined kaolin has high activity.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of coal series kaolinite, and in particular relates to a coal series kaolinite calcining method which reduces the calcining temperature. Background technique [0002] Coal-measure kaolinite mainly exists in the roof and floor of the coal seam and the gangue of the coal seam, and coexists with coal. There are abundant kaolinite resources in coal-bearing strata in my country, and its proven prospective reserves are as high as 18 billion tons. It is one of the non-metallic mineral resources with double advantages in reserves and quality, and has huge development and utilization value. Generally, it can be extracted at the same time as the coal seam is mined. In the past, these precious resources were often discarded as gangue, which not only wastes resources, occupies land, but also seriously pollutes the environment. In order to make full use of coal resources and develop circular economy, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/40
Inventor 程宏飞刘钦甫张志亮
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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