CN104512916A - Preheating method for gibbsite atmospheric pressure pre-desilication slurry - Google Patents
Preheating method for gibbsite atmospheric pressure pre-desilication slurry Download PDFInfo
- Publication number
- CN104512916A CN104512916A CN201310450798.5A CN201310450798A CN104512916A CN 104512916 A CN104512916 A CN 104512916A CN 201310450798 A CN201310450798 A CN 201310450798A CN 104512916 A CN104512916 A CN 104512916A
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- China
- Prior art keywords
- gibbsite
- preheating
- desilication
- desiliconizing
- steam
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Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
Abstract
The invention discloses a preheating method for a gibbsite atmospheric pressure pre-desilication slurry. The slurry is gibbsite, the preheating temperature is 106-110DEG C, and employing a multi-tubular heater (MTH) to replace a single casing pipe preheater. The method provided by the invention gives consideration to the low temperature dissolution characteristic of gibbsite, properly enhances the pre-desilication heating temperature to ensure the pre-desilication effect, and the dissolved secondary steam is adopted as the preheating steam so as to save energy and reduce consumption. In addition, an employed MTH heater can be arranged on the same plane, the support structure investment is lowered, and at the same time the arrangement is convenient for installation, maintenance and cleaning, and the plant operation efficiency can be improved.
Description
Technical field
The present invention relates to a kind of pre-heating mean of gibbsite normal pressure pre-desiliconizing slip, belong to the technical field of process for making alumina.
Background technology
In alumina producing Bayer process technique, pre-desiliconizing is absolutely necessary operation, by pre-desiliconizing operation, kaolinite in ore and alkali reaction generate Sodium-silica slag, reduce reacted to the silicone content entering stripping operation, thus reduce dissolving-out cannula and remaining tank and scab, improve sleeve pipe heat transfer coefficient, extend sleeve pipe working time.On the other hand, the white residue that pre-desilicification process generates can take away partial impurities, plays the object of sodium aluminate solution purification, thus reduces foreign matter content in product.Along with domestic diaspore reserves reduce and grade decline, found the factory and seem particularly important in import gibbsite or abroad gibbsite mining area, China is less to gibbsite research, gibbsite pre-desiliconizing conventional pattern diaspore method, its processing condition are generally: desiliconization temperature 95-100 DEG C, desiliconization time 8-12 hour, admittedly containing 350-800g/l.The single sleeve pipe of the many employings of existing gibbsite pre-desiliconizing slip preheating or three barrel forms, have following shortcoming:
1. single sleeve pipe or three sleeve preheating sleeve pipe heat-transfer effects poor, be generally 600-800kcal/m
2dEG C .h.;
2. single sleeve pipe of needing of pre-desilicification process or three sleeve preheating casing length longer, the restriction of oxidated aluminium place, is difficult to arrange pre-thermal sleeve at same plane, often needs multilayer to arrange, causes civil engineering and supporting structure to invest larger;
3. sleeve pipe multilayer is arranged, is unfavorable for that pre-thermal sleeve is installed, cleans or maintenance.
Summary of the invention
The present invention is the pre-heating mean of a kind of gibbsite pre-desiliconizing slip proposed to solve the problem, and it is high that the method has pre-thermal sleeve heat transfer efficiency, civil engineering supporting structure less investment, the features such as installation, maintenance and easy to clean.
For achieving the above object, the present invention is achieved in that
A pre-heating mean for gibbsite normal pressure pre-desiliconizing slip, described slip is gibbsite, and preheating temperature is 106-110 DEG C.
Tubulation preheater is adopted to replace single-sleeve preheating device.
Preheating adopts saturation steam indirect heating, and saturation steam uses stripping live steam condensed water flash steam.
Tubulation preheater adopts pipe in 20-30 root.
Advantage of the present invention is:
(1) tubulation preheater (the Multi-Tubular Heater of pipe in 20-30 root is adopted, be called for short MTH) replace single sleeve pipe or three sleeve preheatings, concrete mode is: the slip that raw material grinding mill operation is sent here is after MTH, temperature is heated to 106-110 DEG C from 80-85 DEG C, higher than the 95-100 DEG C that diaspore is conventional, this is because for gibbsite, at pre-desiliconizing temperature, in gibbsite, aluminum oxide also there occurs dissolving, and the solubilizing reaction of aluminum oxide is thermo-negative reaction, cause pre-desiliconizing temperature to decline, affect pre-desiliconizing effect.MTH type of heating is saturation steam indirect heating, heating steam is from stripping live steam condensed water flash steam, temperature 140-160 DEG C, steam condensate returns to boiler house, slip after heating enters desiliconization slot, desiliconization time 8-10 hour, the slip after desiliconization enters stripping operation, thus completes the pre-desiliconizing of gibbsite.
Compared with prior art, the present invention adopts the MTH preheater of pipe in 20-30 root, increase the contact area of ore pulp and steam in unit length, pre-desiliconizing preheating casing length is reduced to original 25-30%, can arrange at same plane, less civil engineering and supporting structure investment, convenient maintenance and cleaning.Pre-thermal sleeve shortens in addition, and fluid resistance to flow in sleeve pipe reduces, and reduces preheater fresh feed pump top hole pressure.
Embodiment
Embodiment 1
From the raw material slurry that raw material grinding mill comes, temperature 80 DEG C, admittedly containing 400g/l, then enter MTH preheater (inside having sleeve pipe 20), slip coutroi velocity 2.0m/s, adopt 150 DEG C of stripping live steam condensed water flash steams, steam condensate returns to boiler house after reclaiming, slip temperature after preheating is increased to 106 DEG C, then enters pre-desilication tank, and 8 hours residence time completed pre-desiliconizing.
Embodiment 2
From the raw material slurry that raw material grinding mill comes, temperature 85 DEG C, admittedly containing 500g/l, then enter MTH preheater (inside having sleeve pipe 30), slip coutroi velocity 2.2m/s, adopt 150 DEG C of stripping live steam condensed water flash steams, steam condensate returns to boiler house after reclaiming, slip temperature after preheating is increased to 110 DEG C, then enters pre-desilication tank, and 10 hours residence time completed pre-desiliconizing.
Contemplated by the invention the feature of gibbsite low temperature stripping, for ensureing pre-desiliconizing effect, suitably improve pre-desiliconizing Heating temperature, Preheated steam adopts stripping secondary steam, energy-saving and cost-reducing; The MTH well heater adopted in addition can be arranged in same plane, while the investment of reduction supporting structure, is convenient to again install, overhaul and cleaning, improves plant operation efficiency.
Claims (4)
1. a pre-heating mean for gibbsite normal pressure pre-desiliconizing slip, is characterized in that: described slip is gibbsite, and preheating temperature is 106-110 DEG C.
2. the pre-heating mean of a kind of gibbsite normal pressure pre-desiliconizing slip according to claim 1, is characterized in that: adopt tubulation preheater to replace single-sleeve preheating device.
3. the pre-heating mean of a kind of gibbsite normal pressure pre-desiliconizing slip according to claim 1, is characterized in that: preheating adopts saturation steam indirect heating, and saturation steam uses stripping live steam condensed water flash steam.
4. the pre-heating mean of a kind of gibbsite normal pressure pre-desiliconizing slip according to claim 2, is characterized in that: tubulation preheater adopts pipe in 20-30 root.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310450798.5A CN104512916B (en) | 2013-09-27 | 2013-09-27 | Preheating method for gibbsite atmospheric pressure pre-desilication slurry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310450798.5A CN104512916B (en) | 2013-09-27 | 2013-09-27 | Preheating method for gibbsite atmospheric pressure pre-desilication slurry |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104512916A true CN104512916A (en) | 2015-04-15 |
| CN104512916B CN104512916B (en) | 2017-01-25 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310450798.5A Active CN104512916B (en) | 2013-09-27 | 2013-09-27 | Preheating method for gibbsite atmospheric pressure pre-desilication slurry |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1059703A (en) * | 1991-11-01 | 1992-03-25 | 郑州铝厂 | Continuous desilincation process for crude liquid of sodium carbonate |
| WO1994018122A1 (en) * | 1993-02-01 | 1994-08-18 | Alcan International Limited | Process and apparatus for the extraction of gibbsitic alumina from bauxite |
| CN1936033A (en) * | 2006-10-19 | 2007-03-28 | 沈阳铝镁设计研究院 | Bauxite stripping process by Bayer process |
| CN102009990A (en) * | 2010-12-15 | 2011-04-13 | 中国铝业股份有限公司 | Method for leaching bauxite ore pulp |
| CN102249271A (en) * | 2011-05-27 | 2011-11-23 | 东北大学设计研究院（有限公司） | Tube array and remaining tank dissolving-out system and method for gibbsite bauxite |
-
2013
- 2013-09-27 CN CN201310450798.5A patent/CN104512916B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1059703A (en) * | 1991-11-01 | 1992-03-25 | 郑州铝厂 | Continuous desilincation process for crude liquid of sodium carbonate |
| WO1994018122A1 (en) * | 1993-02-01 | 1994-08-18 | Alcan International Limited | Process and apparatus for the extraction of gibbsitic alumina from bauxite |
| CN1936033A (en) * | 2006-10-19 | 2007-03-28 | 沈阳铝镁设计研究院 | Bauxite stripping process by Bayer process |
| CN102009990A (en) * | 2010-12-15 | 2011-04-13 | 中国铝业股份有限公司 | Method for leaching bauxite ore pulp |
| CN102249271A (en) * | 2011-05-27 | 2011-11-23 | 东北大学设计研究院（有限公司） | Tube array and remaining tank dissolving-out system and method for gibbsite bauxite |
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| Publication number | Publication date |
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| CN104512916B (en) | 2017-01-25 |
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