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Rapid cycled fluidized calcining procedure for superfine kaolin and equipment

A technology of ultra-fine kaolin and rapid circulation, applied in clay products, other household utensils, aluminum silicate, etc., can solve the problems of high unit fuel consumption, uneven product quality, insufficient recovery of sensible heat, etc., and achieve calcination time. Adjustment, operation flexibility, complete response effect

Inactive Publication Date: 2005-03-30
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to overcome the low heat transfer rate, uneven product quality, long calcination process, low production efficiency, small production scale, insufficient sensible heat recovery of high-temperature solid calcined material and high-temperature flue gas in the existing kaolin calcining method. sufficient, high unit fuel consumption, high production cost and other defects, and provide a gas-solid contact, uniform calcination temperature, uniform and stable product quality; can make full use of the waste heat of the calcination process, greatly reducing fuel consumption; heat and mass transfer fast , the calcination reaction is rapid, and the production efficiency can be greatly improved; the rapid circulation fluidized calcination process and equipment of ultra-fine kaolin with low production cost and large-scale production

Method used

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  • Rapid cycled fluidized calcining procedure for superfine kaolin and equipment
  • Rapid cycled fluidized calcining procedure for superfine kaolin and equipment
  • Rapid cycled fluidized calcining procedure for superfine kaolin and equipment

Examples

Experimental program
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Effect test

Embodiment 1

[0048] A coal-measure kaolinite (soil) sample in a certain place in China, code-named DN, has a kaolinite (soil) content of 91% and a natural whiteness of 45.3%. Mineral samples of different particle sizes made by grinding are about 0.05-45μm, 0.05-15μm, 0.05-8μm and 0.05-4μm, respectively recorded as codes DN-1, DN-2, DN-3, and DN- 4. The weight percentages of each ore sample with particle sizes smaller than 2 μm are 16%, 28%, 32% and 91% respectively.

[0049]A, (1) the ore sample with a particle size of about 0.05-45 μm (wherein the weight percentage of the ore sample less than 2 μm is 16%) is promoted with a pneumatic lift feeder and sent to a cyclone preheater ( see figure 1 Preheat to about 500°C in subscripts 4 and 9);

[0050] (2) Send the ore sample preheated to 500°C into the calciner from the lower part of the rapid circulation fluidized calciner provided by the present invention, and simultaneously feed synthetic gas into the calciner; send primary air from the b...

Embodiment 2

[0068] The coal series kaolinite (soil) ore sample in a certain place in China in Example 1, code-named DN, has a kaolinite (soil) content of 95% and a natural whiteness of 55.3%. Mineral samples of different particle sizes of about 0.05-45μm, 0.05-15μm, 0.05-8μm and 0.05-4μm are made after grinding, which are respectively coded as DN-11, DN-22, DN-33, and DN- 44. The weight percentages of each ore sample smaller than 2 μm are 18%, 30%, 35% and 92% respectively.

[0069] Sample code

Embodiment 3

[0071] A kaolinite (soil) ore sample from a certain place in China, code-named DN, has a kaolinite (soil) content of 88% and a natural whiteness of 65.8%. Mineral samples of different particle sizes made by grinding are about 0.05-45μm, 0.05-15μm, 0.05-8μm and 0.05-4μm, respectively recorded as codes DN-111, DN-222, DN-333, and DN- 444, the weight percentages of each ore sample smaller than 2μm are 20%, 29%, 33% and 91% respectively.

[0072]

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Abstract

The invention relates to superfine Kaolin calcining process and device, the prodn, method includes; preheating kaolin raw powder material, then putting it in fluidization calcining furnace from the bottom, at same time, sending fuel into the furnace, preheated primary air is sent from plenum under the furnace burns with the fuel and to form a reducibility atmosphere calcining area in the lower section, the volume content of CO+H2 in reduction area is 0-10 percent, secondary air is sent from top of the reduction area to burn residual CO+H2 completely, airflow speed is 1-6m / s in the furnace, raw powder material is in fluidization, kaolin is circularly burned for 0.3-3 hours in temp. 700-1100 deg.C, then is sent into cyclone cooling system to be cooled to obtain superfine kaolin by mixer-grinding and depolymerizing.

Description

technical field [0001] The invention relates to a kaolin calcining method and its equipment, in particular to a rapid circulation fluidized calcining process of superfine kaolin and its equipment. technical background [0002] Kaolin (soil) is a non-metallic clay mineral. Calcined kaolin is a widely used high-quality industrial raw material. Its particle size is micron or submicron powder, which can be used for plastics, rubber, paper, etc. Fillers and raw materials for paper, construction, automotive and other coatings. Today, the annual consumption of kaolin in the world is increasing year by year, and it is a large-tonnage fine chemical product. [0003] According to the different uses of kaolin products, there are different requirements for the particle size of kaolin products. For example, kaolin used as filler should be less than 45 μm, less than 15 μm or less than 8 μm, while the particle size of kaolin used as coating is usually more than 90% less than 2 μm. It is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/26C04B33/04C09C1/42
CPCY02P20/129
Inventor 李佑楚卢旭晨
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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