CN1493523A - Residual heat utilization method of aluminium oxide calcining process - Google Patents
Residual heat utilization method of aluminium oxide calcining process Download PDFInfo
- Publication number
- CN1493523A CN1493523A CNA021357463A CN02135746A CN1493523A CN 1493523 A CN1493523 A CN 1493523A CN A021357463 A CNA021357463 A CN A021357463A CN 02135746 A CN02135746 A CN 02135746A CN 1493523 A CN1493523 A CN 1493523A
- Authority
- CN
- China
- Prior art keywords
- aluminium
- aluminium hydroxide
- thermooxidizing
- calcining process
- aluminium oxide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 238000001354 calcination Methods 0.000 title claims abstract description 8
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 23
- 229910021502 aluminium hydroxide Inorganic materials 0.000 claims abstract description 23
- 239000013078 crystal Substances 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 12
- 239000004411 aluminium Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000005265 energy consumption Methods 0.000 abstract description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 6
- 239000002918 waste heat Substances 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- -1 hydrogen aluminum oxide Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000009156 water cure Methods 0.000 description 1
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
A method for utilizing the afterheat of calcining alumina step features that the hot alumina at 800-1100 deg.C discharged from calcine furnace is mixed with the granular aluminium hydroxide to complete the crystal form conversion of aluminium hydroxide. It can lower energy consumption by 5%.
Description
The present invention relates to process for making alumina.
In aluminum oxide production process, no matter adopt bayer's process or sintering process, always last procedure calcining process.At calcining process, the wet hydrogen aluminum oxide that will contain 10% left and right sides attached water cures, the processes such as cooling of the thermooxidizing aluminium of going through attached water, deviating from crystal water, discharge behind the crystal conversion under the high temperature, roasting.At present, alumina roasting furnace generally all utilizes the hot flue gas in the roasting process to come dry wet aluminium hydroxide both at home and abroad, that is to say the waste heat that utilizes in the above-mentioned hot flue gas, wet aluminium hydroxide is sloughed attached water, then, above-mentioned exsiccant aluminium hydroxide is finished and is sloughed crystal water and crystal conversion 1050 ℃ of following roasting.After the thermooxidizing aluminium of discharging from stoving oven is cooled to room temperature, be the product aluminum oxide.Further utilize waste heat, the waste heat of the roasting thermooxidizing aluminium of discharging later on particularly, it is further energy-conservation effective way, general way is to write an article on less than 5 microns thin aluminium hydroxide at particle diameter, because the little aluminium hydroxide of this particle diameter is in the middle of with hot flue gas drying process, not only removed attached water, also part has finished the crystal formation conversion, this part thin aluminium hydroxide is separated, mix in two sections coolers with 1050 ℃ of aluminum oxide of reducing to 650 ℃, utilize the waste heat in 650 ℃ the aluminum oxide, above-mentioned thin aluminium hydroxide is all changed into aluminum oxide, this method has realized afterheat utilization in the solid materials, weak point be the aluminium hydroxide of granularity below 5 microns only account for the aluminium hydroxide total amount about 1%, energy-saving effect and not obvious.
The purpose of this invention is to provide a kind of aluminum oxide waste heat that directly utilizes after the roasting about 1050 ℃, cure the method for exsiccant aluminium hydroxide, its energy-saving effect improves more than 10 times.
The UTILIZATION OF VESIDUAL HEAT IN method of aluminium oxide calcining process of the present invention, the thermooxidizing aluminium that stoving oven is discharged mixes mutually with the part aluminium hydroxide of removing attached water, make this aluminium hydroxide finish crystal conversion, the major technology characteristics are, the temperature of described thermooxidizing aluminium is 800-1100 ℃, the granularity of described aluminium hydroxide is less than 100 microns, and its add-on is the 10-15% of the aluminium hydroxide gross weight of removal attached water.
The temperature of above-mentioned thermooxidizing aluminium is preferably 950-1050 ℃.
The method of aluminium oxide calcining process UTILIZATION OF VESIDUAL HEAT IN of the present invention can make full use of the waste heat of thermooxidizing aluminium, makes the Aluminium Hydroxide of 10-15% realize that crystal formation transforms, thereby has reduced energy consumption 5%, makes the monomer capacity of stoving oven improve 10-12% accordingly.
Embodiment: will handle 12% of the aluminium hydroxide gross weight that lost attached water through overheated cigarette device, with the temperature of discharging from stoving oven is that 1000 ℃ thermooxidizing aluminium mixes in the fluidized-bed mixer fully, in order to make the stable operation of fluidized-bed mixer, the material that adds need keep continuously and be even, above-mentioned exsiccant aluminium hydroxide can be used the Rotary feeder feed, and above-mentioned thermooxidizing aluminium can come feed by resistant to elevated temperatures discharge gate.
Claims (2)
1. the UTILIZATION OF VESIDUAL HEAT IN method of aluminium oxide calcining process of the present invention, the thermooxidizing aluminium that stoving oven is discharged mixes mutually with the part aluminium hydroxide of removing attached water, make this aluminium hydroxide finish crystal conversion, it is characterized in that, the temperature of described thermooxidizing aluminium is 800-1100 ℃, the granularity of described aluminium hydroxide is less than 100 microns, and its addition is the 10-15% of the aluminium hydroxide gross weight of removal attached water.
2. in accordance with the method for claim 1, it is characterized in that the temperature of described thermooxidizing aluminium is 950-1050 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02135746 CN1197774C (en) | 2002-10-29 | 2002-10-29 | Residual heat utilization method of aluminium oxide calcining process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02135746 CN1197774C (en) | 2002-10-29 | 2002-10-29 | Residual heat utilization method of aluminium oxide calcining process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1493523A true CN1493523A (en) | 2004-05-05 |
| CN1197774C CN1197774C (en) | 2005-04-20 |
Family
ID=34231492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02135746 Expired - Lifetime CN1197774C (en) | 2002-10-29 | 2002-10-29 | Residual heat utilization method of aluminium oxide calcining process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1197774C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100470389C (en) * | 2005-12-01 | 2009-03-18 | 佳能株式会社 | Sheet processing apparatus and image forming apparatus |
-
2002
- 2002-10-29 CN CN 02135746 patent/CN1197774C/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100470389C (en) * | 2005-12-01 | 2009-03-18 | 佳能株式会社 | Sheet processing apparatus and image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1197774C (en) | 2005-04-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: CHINESE ALUMINIUM CO., LTD. Free format text: FORMER OWNER: SHANDONG ALUMINIUM INDUSTRY CO., LTD. Effective date: 20071026 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20071026 Address after: 100082 No. 62 North Main Street, Beijing, Xizhimen Patentee after: ALUMINUM CORPORATION OF CHINA Ltd. Address before: Nam Dinh town Zhangdian District Shandong city Zibo province 255052 five km road No. 1 Patentee before: Shandong Aluminium Industry Co.,Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20050420 |
|
| CX01 | Expiry of patent term |