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System for producing high-whiteness calcined kaolin by multistage suspension calcination of coal series kaolin

A technology of coal series kaolin and calcined kaolin, applied in the direction of inorganic chemistry, non-metallic elements, silicon compounds, etc., can solve the problems of poor quality uniformity, low processing capacity, low heat utilization rate, etc., and achieve low processing cost and low energy consumption , High heat and mass transfer efficiency

Active Publication Date: 2020-11-06
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the current situation of poor product quality uniformity, low processing capacity, low heat utilization rate and high energy consumption in the existing process of calcination of coal series kaolin, the present invention provides a system for producing high whiteness calcined kaolin by multi-stage suspension calcination of coal series kaolin

Method used

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  • System for producing high-whiteness calcined kaolin by multistage suspension calcination of coal series kaolin

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The system structure of multi-stage suspension calcination of coal series kaolin to produce high whiteness calcined kaolin is as follows: figure 1 As shown, it includes a crusher 1, a mill 2, a feeding bin 4, a screw feeder 6, a suspension dehydration calciner 7, a first cyclone separator 8, a suspension dehydration calciner 9, a second cyclone separator 10, Suspension decarburization calciner 11, third cyclone separator 12, primary cooler 13 and secondary cooler 14;

[0048] The discharge port of the crusher 1 is opposite to the feed port of the mill 2, the discharge port of the mill 2 is opposite to the first feeding belt 3, and the discharge end of the first feeding belt 3 is matched with the feeding bin 4; The discharge port of the feed bin 4 is opposite to the second feed belt 5, the second feed belt 5 matches the feed end of the screw feeder 6, and the discharge end of the screw feeder 6 is connected to the top of the suspension dehydration calciner 7 The feed po...

Embodiment 2

[0068] System structure is the same as embodiment 1;

[0069] Method is with embodiment 1, and difference is:

[0070] (1) Particle size ≤ 0.002mm in the powder accounts for 92% of the total mass; coal series kaolin contains SiO by mass percentage 2 43.55%, Al 2 o 3 38.11%, Fe 2 o 3 0.21%, CaO 0.47%, TiO 2 0.16%, MgO 0.23%, K 2 O0.31%, Na 2 O 0.22%, C 1.51%;

[0071] (2) Dehydration reaction is carried out at 250°C; the residence time of the powder in the suspension dehydration calciner is 6min;

[0072] (3) Dehydration reaction at 800°C; the residence time of the dehydrated material in the suspension dehydroxylation calciner is 20min;

[0073] (4) Decarburization reaction is carried out at 900°C, the volume flow ratio of air and nitrogen is 1:1.5; the residence time of the dehydroxylation material in the suspension decarburization calciner is 60min;

[0074] (5) After the countercurrent heat exchange between the decarbonized material and the air, the temperature o...

Embodiment 3

[0077] System structure is the same as embodiment 1;

[0078] Method is with embodiment 1, and difference is:

[0079] (1) Particle size ≤ 0.002mm in the powder accounts for 95% of the total mass; coal series kaolin contains SiO in mass percentage 2 45.16%, Al 2 o 3 36.54%, Fe 2 o 3 0.16%, CaO 0.55%, TiO 2 0.38%, MgO 0.4%, K 2 O0.36%, Na 2 O 0.35%, C 1.3%;

[0080] (2) Dehydration reaction is carried out at 300°C; the residence time of the powder in the suspension dehydration calciner is 2min;

[0081] (3) Dehydration reaction at 900°C; the residence time of the dehydrated material in the suspension dehydroxylation calciner is 10 minutes;

[0082] (4) Decarburization reaction is carried out at 950°C, the volume flow ratio of air and nitrogen is 1:2; the residence time of the dehydration material in the suspension decarburization calciner is 40min;

[0083] (5) After the countercurrent heat exchange between the decarbonized material and the air, the temperature of...

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Abstract

The invention provides a system for producing high-whiteness calcined kaolin by multistage suspension calcination of coal series kaolin. A crusher, a mill, a feed bin and a spiral feeder are sequentially matched, and the spiral feeder is matched with a feed port of a suspension dehydration calcinator; the suspension dehydration calcinator, the first cyclone separator, the suspension dehydroxylation calcinator, the second cyclone separator, the suspension decarburization calcinator and the third cyclone separator are sequentially communicated in series, and a discharge port of the third cycloneseparator is communicated with a feed port of the first-stage cooler; and the first-stage cooler and the second-stage cooler are communicated in series. The system and the method can realize accurateregulation and control of coal series kaolinite in calcination, obtain products with uniform properties at each stage, and have the advantages of environmental friendliness, low energy consumption, high heat and mass transfer efficiency, low treatment cost, good economy, easiness in realization of large-scale industrial application and the like.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, in particular to a system for producing high-whiteness calcined kaolin by multi-stage suspension calcination of coal series kaolin. Background technique [0002] Coal-measure kaolin is solid waste discharged during the coal mining process, and is generally discarded as a kind of industrial waste. The quality of my country's coal-measure kaolin is high-quality, and the kaolin content in the coal-measure kaolin of several representative ore spots is as high as 95%, which is a high-quality kaolin resource. Coal-series kaolin needs to be calcined to change the kaolin phase and remove the organic matter in order to meet various production needs. However, the quality of calcined kaolin produced by the current coal-based kaolin calcination process and equipment is difficult to meet the needs of users of high-end coating grade products. Therefore, it is of great significance to efficiently r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/40
CPCC01B33/40Y02P20/10
Inventor 袁帅李艳军谢瑞琦韩跃新高鹏
Owner NORTHEASTERN UNIV
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