CN101264912B - Heating and thermal insulation exsolution method for aluminum oxide high-pressure exsolution section - Google Patents
Heating and thermal insulation exsolution method for aluminum oxide high-pressure exsolution section Download PDFInfo
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- CN101264912B CN101264912B CN2007102002815A CN200710200281A CN101264912B CN 101264912 B CN101264912 B CN 101264912B CN 2007102002815 A CN2007102002815 A CN 2007102002815A CN 200710200281 A CN200710200281 A CN 200710200281A CN 101264912 B CN101264912 B CN 101264912B
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- autoclave
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Abstract
The invention discloses a heating and insulating method for the high pressure digestion workshop section of alumina. The invention is characterized in that mineral slurry is heated by steam level by level in an autoclave (1) with a heating tube bundle inside; heat insulation and dissolution of the mineral slurry is done in a heat insulation dwelling tank (2) without heating tube bundle; eighty percent to eighty five percent of the total amount of new steam needed is added to the autoclave (1) from the first level to the fifth level; disolution reaction is done in advance to ensure that the mineral slurry reaches disolution temperature in the autoclave (1) from the first level to the fifth level before entering the heat insulation dwelling tank (2). Compared with the prior art, the heating and insulating method for the high pressure digestion workshop section of alumina has the advantages of more reasonable distribution of the new steam quantity, more effective rinsing of the autoclave with serious scab, good heat transfer effect, saving new steam more than twenty ton per hour, and increasing disolution rate of the mineral slurry by one percent.
Description
Technical field:
The present invention relates to the heating and the insulation dissolving-out method of a kind of aluminum oxide high pressure stripping workshop section.
Background technology:
In alumina producing, when being the bauxite into alumina of raw material in order to diaspore, need aluminum ore is added after caustic alkali makes ore pulp, stripping at high temperature, making the reaction of aluminum oxide in the ore and caustic alkali become sodium aluminate solution enters in the dissolved mineral slurry, in this process, need to heat ore pulp step by step, be incubated stripping after making ore pulp reach the stripping temperature with steam.The heating of ore pulp is to carry out in inside is provided with the autoclave of heating tube bundle, the heating-surface area of common autoclaves at different levels is identical, be after becoming a plurality of rows with the weldless steel tube layout, vertically to be hung in the autoclave, the insulation stripping of ore pulp is to carry out in the autoclave of no heating tube bundle.Adopt above heating and insulation stripping mode, find two problems in process of production: slurry temperature descends in (1) insulation remaining tank, makes the stripping reaction abundant inadequately, thereby influences the solubility rate of aluminum oxide in the ore pulp.(2) last three grades of high temperature section autoclaves of live steam heating scab seriously, also have the hard middle soft red mud in some surfaces to scab the silicon of separating out under expected high temperature, titanium scab.Silicon, titanium scab and can more efficiently clean by the mode of burning, the cleaning that soft red mud scabbed in the middle of the surface was hard is then comparatively difficult, owing in the autoclave a large amount of heating tube bundles is housed, space in the autoclave is originally narrower and small, and the ore pulp of what autoclave of live steam heating back scabs thicker, some spaces have been occupied again, the work difficulty of cleaning autoclave is strengthened, cleaning performance is bad, after cleaning sordid autoclave and putting into operation again, its heat-transfer effect obviously descends, and the stripping steam consumption obviously increases.
Summary of the invention:
The objective of the invention is to: provide a kind of add-on that can make live steam distribute more reasonable, to the heating of the aluminum oxide high pressure stripping workshop section that cleaning is more effective and heat-transfer effect is good, the ore pulp solubility rate is high of the heavier autoclave that scabs and be incubated dissolving-out method, to overcome the deficiencies in the prior art.
The present invention is achieved in that its uses steam to heat ore pulp step by step in inside is provided with the autoclave (1) of heating tube bundle, the insulation stripping of ore pulp is carried out in the insulation remaining tank (2) of no heating tube bundle, it joins 80%～85% of required live steam total amount in preceding 1～5 grade of autoclave (1), allow the stripping reaction take place in advance, make ore pulp enter insulation remaining tank (2) before, just reach the stripping temperature in 1～5 grade of autoclave (1) in front.
It also reduces 30%～40% with the heating tube bundle quantity in last 1～3 grade of autoclave (1) on original basis, replenishing after slurry temperature reduces when allowing last 1～3 grade of autoclave (1) as just stripping reaction generation.
The present invention is the characteristics of thermo-negative reaction according to the stripping reaction, the steam add-on of heating autoclave is carried out properly distributed again, make what autoclave of front as far as possible ore pulp is heated to the stripping temperature, allow the stripping reaction take place in advance, avoid endothermic heat of reaction that the slurry temperature in the insulation remaining tank is reduced, ore pulp has the sufficient residence time in the insulation remaining tank, the ore pulp solubility rate is guaranteed.Because reaching the time of stripping temperature shifts to an earlier date, make the heating-surface area of the autoclave before the insulation remaining tank into suitably to reduce, replenishing after slurry temperature reduces when allowing it as just stripping reaction generation, like this, last what autoclave internal heating tube bank of live steam heating reduces, space for maintenance in the autoclave strengthens, and the spray gun of being convenient to the pyrogenic process cleaning of evaporator can comparatively effectively rotate in the purge tank and scab.Compared with prior art, owing to taked above technical scheme, make the add-on distribution of live steam more reasonable, the cleaning of heavier autoclave of scabbing is more effective, heat-transfer effect is clearly better, and per hour saves live steam and can reach more than 20 tons, and the ore pulp solubility rate can improve 1%.
Description of drawings:
Fig. 1 schematic flow sheet of the present invention.
Embodiment:
Embodiments of the invention: as shown in Figure 1, its uses high pressure steam in inside is provided with the autoclave 1 of heating tube bundle ore pulp to be heated step by step, and the insulation stripping of ore pulp is carried out in the insulation remaining tank 2 of no heating tube bundle.During stripping, it is readjusted the steam regulating valve on the live steam feed-pipe, 80%～85% of required live steam total amount is joined in the 5 grades of autoclaves 1 in front, allow the stripping reaction take place in advance, before making ore pulp enter insulation remaining tank 2, in the relatively large 5 grades of autoclaves 1 in front of heating-surface area, reach the stripping temperature as far as possible.It reduces 30%～40% with the heating tube bundle quantity in last 3 grades of autoclaves 1 simultaneously on original basis, like this after stripping reaction beginning, when temperature descends to some extent, replenish with 1 pair of stripping temperature of last 3 grades of autoclaves before the insulation remaining tank 2, that heating-surface area is less relatively, make the temperature value that the stripping temperature remains on to be needed, enter again in the insulation remaining tank 2 and be incubated stripping.
Claims (1)
- The heating of an aluminum oxide high pressure stripping workshop section and the insulation dissolving-out method, its uses steam to heat ore pulp step by step in inside is provided with the autoclave of heating tube bundle, the insulation stripping of ore pulp is carried out in the insulation remaining tank of no heating tube bundle, it is characterized in that: it joins 80%～85% of required live steam total amount in preceding 1～5 grade of autoclave, allow the stripping reaction take place in advance, ore pulp is entered before the insulation remaining tank, in preceding 1～5 grade of autoclave, just reach the stripping temperature; Heating tube bundle quantity in last 1～3 grade of autoclave is reduced 30%～40% on original basis, replenishing after slurry temperature reduces when allowing last 1～3 grade of autoclave as just stripping reaction generation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007102002815A CN101264912B (en) | 2007-03-14 | 2007-03-14 | Heating and thermal insulation exsolution method for aluminum oxide high-pressure exsolution section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007102002815A CN101264912B (en) | 2007-03-14 | 2007-03-14 | Heating and thermal insulation exsolution method for aluminum oxide high-pressure exsolution section |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101264912A CN101264912A (en) | 2008-09-17 |
| CN101264912B true CN101264912B (en) | 2011-05-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007102002815A Expired - Fee Related CN101264912B (en) | 2007-03-14 | 2007-03-14 | Heating and thermal insulation exsolution method for aluminum oxide high-pressure exsolution section |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101264912B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102234122A (en) * | 2010-04-23 | 2011-11-09 | 贵阳铝镁设计研究院有限公司 | Method for using steam to supply heat for pipeline digestion and apparatus thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1752231A (en) * | 2005-10-19 | 2006-03-29 | 贵阳铝镁设计研究院 | Device for dissolving out aluminium oxide |
-
2007
- 2007-03-14 CN CN2007102002815A patent/CN101264912B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1752231A (en) * | 2005-10-19 | 2006-03-29 | 贵阳铝镁设计研究院 | Device for dissolving out aluminium oxide |
Non-Patent Citations (2)
| Title |
|---|
| 王丽娟.拜耳法溶出技术及装备的选择.《轻金属》.2004,(第10期),第25-27页. * |
| 金亚利.一水硬铝石型铝土矿溶出的新技术.《轻金属》.2004,(第8期),第20-22页. * |
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| Publication number | Publication date |
|---|---|
| CN101264912A (en) | 2008-09-17 |
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Owner name: GUIYANG ALUMINIUM AND MAGNESIUM DESIGN INSTITUTE C Free format text: FORMER OWNER: GUIYANG ALUMINIUM AND MAGNESIUM DESIGN INST. Effective date: 20110523 |
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Free format text: CORRECT: ADDRESS; FROM: 550004 NO. 208, BEIJING ROAD, GUIYANG CITY, GUIZHOU PROVINCE TO: 550081 NO. 2, JINZHU ROAD, JINYANG NEW DISTRICT, GUIYANG CITY |
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Effective date of registration: 20110523 Address after: 550081 2 Jin Zhu Road, Jinyang New District, Guiyang Patentee after: Guiyang Aluminum & Magnesium Design Institute Co., Ltd. Address before: 550004 No. 208, Beijing Road, Guiyang, Guizhou Patentee before: Guiyang Aluminium and Magnesium Design Inst. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110504 Termination date: 20160314 |