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Dry sintering method and apparatus for aluminum oxide clinker

A technology of sintering device and sintering method, which is applied in the fields of alumina/hydroxide preparation, chemical industry, sustainable manufacturing/processing, etc., and can solve the problem of insufficient utilization of the heat of exhaust gas of the rotary kiln, unclear edge of the flame of the coal injection pipe, and Shape and temperature misjudgment and other problems, to achieve the effect of favorable thermal system, small fluctuation range, and effective clinker quality

Inactive Publication Date: 2009-06-24
湖南中大冶金设计有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

⑤ Unclear vision: Due to the large amount of kiln dust and chaos in the kiln, the flame edge of the coal injection pipe is unclear and the color is distorted, and it is easy to misjudge the flame shape and temperature, which is not conducive to the stable operation of the rotary kiln
⑥ The clinker has poor grindability, and the heat in the exhaust gas of the rotary kiln is not fully utilized
In addition, the production capacity of the rotary kiln is also limited

Method used

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  • Dry sintering method and apparatus for aluminum oxide clinker
  • Dry sintering method and apparatus for aluminum oxide clinker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The raw slurry enters the drying tower (4) from the raw slurry tank (14) and the raw slurry pump (15) through the spray gun (3), and is fully heated with the hot air from the hot blast stove (2) and the kiln tail (6). Exchange to obtain dry raw meal with a moisture content of 3 to 5%. The dry raw meal enters the dry feed bin (5) through the hoist (16), and enters the rotary kiln (7) through the disc feeder (17). Sintering becomes qualified clinker, then falls into the cooler (22) from the kiln head of the rotary kiln, and is discharged from the cooler (22) tail.

Embodiment 2

[0044] Dry raw meal with a moisture content of 3-5% enters the rotary kiln at a ratio of 9:1 to kiln dust, sinters the clinker at a temperature of 1230°C to 1350°C, and discharges it through the tail of the cooler. After measurement, the appearance of the clinker is taupe, the particle size is 10-25mm, the loose specific gravity is 0.95-1.05, η A净 is 97.65%, about 3 percentage points higher than the existing technology, η N净 97.96%, about 1 percentage point higher than the existing technology; the comprehensive energy consumption is 128kg standard coal / t-clinker, about 10kg lower than the existing technology; the output is 72kg / m 3 Kiln volume, about 25kg / m higher than the existing technology 3 Kiln volume.

Embodiment 3

[0046] Dry raw meal with a moisture content of 3-5% enters the rotary kiln at a ratio of 8:2 to kiln dust, sinters the clinker at a temperature of 1230°C to 1350°C, and discharges it through the tail of the cooler. After measurement, the appearance of the clinker is taupe, the particle size is 10-25mm, and the loose specific gravity is 0.97-1.08, η A净 is 97.42%, about 2.7 percentage points higher than the existing technology, η N净 97.63%, about 1 percentage point higher than the existing technology; the comprehensive energy consumption is 131.3kg standard coal / t-clinker, about 6.5kg lower than the existing technology; the output is 68.5kg / m 3 Kiln volume, about 21kg / m higher than the existing technology 3 Kiln volume.

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Abstract

The invention relates to a method for sintering an alumina clinker by a drying method. The method comprises that: raw slurry is dried in a drying tower to obtain dry raw materials with the moisture content rate of between 3 and 5 percent, and then the dry raw materials are mixed with kiln dust by weight percentage of 9 : 1-7 : 3 to be sintered in a kiln to obtain qualified clinkers. A sintering device comprises an air heater, a slurry drying device, a dry material silo, a kiln tail hood, a kiln body, a powdered coal silo, a powdered coal screw machine, a dry raw material conveyor, a disc feeding machine, a feed opening and a blower. The slurry drying device is provided with the dry raw material conveyor which delivers dry materials into the dry material silo arranged above the disc feeding machine; the slurry drying device is provided with a hot air pipe which is connected with the air heater and one end of the kiln tail hood respectively; and the other end of the kiln tail hood is positioned in a dry material feeding opening on the tail of the kiln body. The method has the advantages of simple process method, convenient operation, energy conservation and high taste of the sintered clinker and is favorable for stabilizing the thermal regulation of a rotary kiln. The device can effectively improve the productivity and the service life of the rotary kiln, is applicable to industrialized production, can be used for matching with the prior rotary kilns with various models, and can replace the process flow for producing the alumina by the prior sintering method.

Description

technical field [0001] The invention discloses an alumina clinker dry sintering method and a device, belonging to the field of clinker sintering technology for producing alumina by sintering. Background technique [0002] In the technological process of producing alumina by sintering method, the clinker sintering process is the most critical process. This is not only reflected in the fact that the clinker sintering process accounts for about one-third of the total investment of alumina enterprises, and the unit production cost accounts for about one-half of the total cost, but also because this process has the largest equipment in the alumina production process—— ——The rotary kiln is the process with the highest energy consumption (more than half of the total energy consumption) in the entire alumina production process. [0003] The current sintering methods all use wet sintering technology to produce clinker. [0004] There are many problems in the wet clinker sintering p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/30
CPCY02P20/10
Inventor 丁凤其李劼李明
Owner 湖南中大冶金设计有限公司
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