CN106276999A - A kind of method recycling dissolution flash distillation exhaust steam in alumina producing - Google Patents
A kind of method recycling dissolution flash distillation exhaust steam in alumina producing Download PDFInfo
- Publication number
- CN106276999A CN106276999A CN201610710614.8A CN201610710614A CN106276999A CN 106276999 A CN106276999 A CN 106276999A CN 201610710614 A CN201610710614 A CN 201610710614A CN 106276999 A CN106276999 A CN 106276999A
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- China
- Prior art keywords
- flash distillation
- exhaust steam
- final stage
- desiliconizing
- stage flash
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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
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/06—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process
Abstract
A kind of method recycling dissolution flash distillation exhaust steam in alumina producing, send into pre-desiliconizing operation including final stage flash distillation exhaust steam dissolution operation in alumina producing obtained or final stage flash distillation and multistage flash evaporation exhaust steam before and be used for the preheating of raw ore slurry, raw ore slurry is heated to pre-desiliconizing and requires temperature；The condensed water formed after final stage flash distillation exhaust steam or final stage flash distillation and multistage flash evaporation exhaust steam before being preheated raw ore slurry delivers to hot water station as red mud wash water and a part for full station-service hot water.Present invention achieves whole recovery of final stage flash distillation exhaust steam, and can one or more levels flash distillation exhaust steam before final stage flash distillation be final stage flash distillation exhaust steam power-assisted thermal source and/or independent thermal source, the initial steam usage amount achieving desiliconization workshop section is zero, effectively reduces the energy consumption of alumina producer, production cost and environmental pollution.
Description
Technical field
The invention belongs to technical field of alumina production, recycle dissolution flash distillation particularly in a kind of alumina producing
The method of exhaust steam.
Background technology
The digestion workshop of Bayer process alumina producer is the core workshop in whole aluminum oxide production process, and it not only affects
The yield of full factory aluminium oxide, is also alumina producer major power consumer, directly affects the technical-economic index of full factory, dissolving-out technology
Height also represent the technical merit of full factory.Along with the development of aluminum oxide industry, further improving environment economic indicator, reduction
Comprehensive energy consumption is increasingly subject to people's attention.
At present in the dissolving-out process of China's alumina producer, the raw ore slurry sent here from raw material workshop enters pre-desiliconizing workshop section
In double pipe heater (or pre-de-heating tank of band heating tube bundle), it is all to utilize initial steam (or dissolution high-pressure live steam condensate
Flash distillation exhaust steam) ore pulp is risen to 100 ~ 105 DEG C of pre-desiliconizing temperature, it is then fed in pre-desilication tank carrying out continuous desiliconizing.Desiliconization
After ore pulp and mother solution Mixed adjustment raw ore slurry Rp and temperature, qualified ore pulp delivers to the cannula primary heater of dissolution workshop section.Sleeve pipe is pre-
Hot device uses multistage flash evaporation exhaust steam and the heating of high pressure initial steam, is heated to leaching temperature subsequently into insulation process in leaching, dissolution
Rear slip cools the temperature to 115 ~ 140 DEG C through multistage flash evaporation, and the red mud wash liquor that after flash distillation, slip and sedimentation workshop section come is at dilution trap
In converge after pumping toward sedimentation workshop.The exhaust steam (except final stage) of multistage flash evaporation preheats for dissolved mineral slurry, and final stage flash distillation exhaust steam
Then enter water cooler to reclaim.
Water cooler uses water at low temperature to reclaim final stage flash distillation exhaust steam, and the exhaust steam response rate is less than 60%, and remaining fails to reclaim
Part exhaust steam be then directly discharged in air.On the one hand so operation causes the exhaust steam residual heat can not efficient recovery and direct losses
Fall, increase production cost and the energy consumption of alumina producer；On the other hand also result in whole system and introduce unnecessary water, increase follow-up steaming
While sending out workshop section's task amount, the most indirectly increase the production cost of alumina producer and cause the waste of water resource；In addition in exhaust steam
Containing a small amount of alkali, this exhaust steam containing alkali enters and can cause certain environmental pollution in air.
Summary of the invention
The problem existed for prior art, the present invention provides in a kind of alumina producing and recycles dissolution flash distillation exhaust steam
Method, can effectively reduce comprehensive energy consumption and the production cost of alumina producer.The technical scheme is that
A kind of method recycling dissolution flash distillation exhaust steam in alumina producing, obtains including by dissolution operation in alumina producing
Final stage flash distillation exhaust steam or final stage flash distillation and multistage flash evaporation exhaust steam before send into the preheating for raw ore slurry of the pre-desiliconizing operation,
Raw ore slurry is heated to pre-desiliconizing and requires temperature；By final stage flash distillation exhaust steam or final stage flash distillation and multistage flash evaporation exhaust steam pair before
The condensed water formed after raw ore slurry preheating delivers to hot water station as red mud wash water and a part for full station-service hot water.
In said method, when pre-desiliconizing operation unit and dissolution operation unit are apart from each other, described method also include by
One or more levels flash distillation exhaust steam before the final stage flash distillation that dissolution operation obtains is divided into two sections, and one section is sent directly into pre-desiliconizing operation
For the preheating of raw ore slurry, another section is as the power-assisted thermal source of final stage flash distillation exhaust steam, pre-de-for final stage flash distillation exhaust steam being sent into
Silicon operation and the temperature of lifting final stage flash distillation exhaust steam.
The method that in the alumina producing of the present invention, the flash distillation exhaust steam of dissolution final stage recycles, compared with prior art, special
Put and provide the benefit that:
1. the final stage flash distillation exhaust steam of dissolution operation is used for heating raw ore slurry by the present invention, and the condensed water after heat exchange sends into heat
Water station recycles, it is achieved that whole recovery of exhaust steam, and takes full advantage of the heat of final stage exhaust steam, effectively reduces oxidation
The energy consumption of aluminium manufacturer, production cost and environmental pollution.
2. the power-assisted thermal source that the present invention one or more levels flash distillation exhaust steam before final stage flash distillation is final stage flash distillation exhaust steam and/
Or independent thermal source, the workshop apart from each other with dissolution operation unit for pre-desiliconizing operation unit also can effectively realize dissolution flash distillation
The recycling of exhaust steam, and the initial steam usage amount achieving desiliconization workshop section is zero.
Accompanying drawing explanation
Fig. 1 is the process flow diagram that the present invention recycles dissolution flash distillation exhaust steam in aluminum oxide production process；
Fig. 2 is that the technological process apparatus of the embodiment of the present invention 2 connects sketch；
Fig. 3 is that the technological process apparatus of the embodiment of the present invention 3 connects sketch；
In Fig. 2 and Fig. 3,1-raw ore stock tank, 2-pre-desiliconizing feed pump, 3 ~ 4-pre-desiliconizing cannula primary heater, 5 ~ 7-pre-desilication tank, 8-
Dissolution feed pump, 9 ~ 11-Multi-stage sleeve preheater, 12 ~ 14-heat insulation tank (manages), 15 ~ 17-multistage ore pulp flash vessel, 18 ~ 22-pair
Answer the condensate water pots at different levels of heater, 23 ~ 25-condensate pump, 26 ~ 27-pre-desiliconizing heating tank.
Detailed description of the invention
Combine accompanying drawing below by way of specific embodiment the specific implementation process of the present invention is described, but embodiment is interior
Hold and be not limiting as protection scope of the present invention.
Embodiment 1
The present embodiment recycles the technological process of dissolution flash distillation exhaust steam in aluminum oxide production process as it is shown in figure 1, step is:
Pre-desiliconizing cannula primary heater is sent in the final stage flash distillation exhaust steam that temperature is 125 DEG C dissolution operation in alumina producing obtained, will
Temperature is that the raw ore slurry of 84 DEG C is heated to 99 DEG C, and then raw ore slurry carries out continuous desiliconizing in entering pre-desilication tank；And final stage is dodged
The condensed water steaming exhaust steam formation delivers to hot water station as red mud wash water and a part for full station-service hot water.
The preheating for dissolved mineral slurry of the Multi-stage sleeve preheater is sent in multistage flash evaporation exhaust steam between final stage flash distillation, its condensation
Water is delivered to power plant and is utilized.
Embodiment 2
The aluminum oxide production device that the present embodiment is used is as in figure 2 it is shown, recycle the work of dissolution flash distillation exhaust steam during Gai
Process flow is as it is shown in figure 1, step is: the final stage flash distillation exhaust steam that temperature is 109 DEG C dissolution operation in alumina producing obtained
Send into pre-desiliconizing cannula primary heater 3 and the raw ore slurry that temperature is 80 DEG C is heated to 95 DEG C, then by dissolution operation in alumina producing
It is 95 DEG C by temperature that pre-desiliconizing cannula primary heater 4 is sent in the flash distillation exhaust steam of the final stage flash distillation previous stage that temperature is 125 DEG C obtained
Raw ore slurry be heated to 100 DEG C, then raw ore slurry enters in pre-desilication tank and carries out continuous desiliconizing；And by final stage flash distillation and previous stage
The condensed water that flash distillation exhaust steam is formed delivers to hot water station as red mud wash water and a part for full station-service hot water.
The preheating for dissolved mineral slurry of the Multi-stage sleeve preheater is sent in flash distillation exhaust steam before final stage flash distillation previous stage flash distillation,
Its condensed water is delivered to power plant and is utilized.
Embodiment 3
The aluminum oxide production device that the present embodiment is used is as it is shown on figure 3, recycle the work of dissolution flash distillation exhaust steam during Gai
Process flow is as it is shown in figure 1, step is: the final stage flash distillation that temperature is 125 DEG C dissolution operation in alumina producing obtained is previous
Level exhaust steam is divided into two sections, and one section of power-assisted thermal source as final stage flash distillation exhaust steam merges with the final stage flash distillation exhaust steam that temperature is 105 DEG C
The raw ore slurry that temperature is 63 DEG C is heated to 95 DEG C by rear feeding pre-desiliconizing heating tank 26, and another section sends into pre-desiliconizing heating tank 27 will
Temperature is that the raw ore slurry of 95 DEG C is heated to 100 DEG C, and then raw ore slurry carries out continuous desiliconizing in entering pre-desilication tank；And final stage is dodged
Steam and the condensed water of previous stage flash distillation exhaust steam formation delivers to hot water station as red mud wash water and a part for full station-service hot water.
The preheating for dissolved mineral slurry of the Multi-stage sleeve preheater is sent in flash distillation exhaust steam before final stage flash distillation previous stage flash distillation,
Its condensed water is delivered to power plant and is utilized.
Claims (2)
1. the method recycling dissolution flash distillation exhaust steam in an alumina producing, it is characterised in that described method includes aoxidizing
During aluminum produces, pre-desiliconizing is sent in the final stage flash distillation exhaust steam that obtains of dissolution operation or final stage flash distillation and multistage flash evaporation exhaust steam before
Raw ore slurry, for the preheating of raw ore slurry, is heated to pre-desiliconizing and requires temperature by operation；By final stage flash distillation exhaust steam or final stage flash distillation
And multistage flash evaporation exhaust steam before to raw ore slurry preheat after formed condensed water deliver to hot water station as red mud wash water and full station-service
A part for hot water.
The method recycling dissolution flash distillation exhaust steam in a kind of alumina producing the most according to claim 1, its feature exists
In when pre-desiliconizing operation unit and dissolution operation unit are apart from each other, described method also includes final stage dissolution operation obtained
One or more levels flash distillation exhaust steam before flash distillation is divided into two sections, and one section is sent directly into the preheating for raw ore slurry of the pre-desiliconizing operation,
Another section is as the power-assisted thermal source of final stage flash distillation exhaust steam, for final stage flash distillation exhaust steam being sent into pre-desiliconizing operation and promoting final stage
The temperature of flash distillation exhaust steam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610710614.8A CN106276999A (en) | 2016-08-24 | 2016-08-24 | A kind of method recycling dissolution flash distillation exhaust steam in alumina producing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610710614.8A CN106276999A (en) | 2016-08-24 | 2016-08-24 | A kind of method recycling dissolution flash distillation exhaust steam in alumina producing |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107915244A (en) * | 2018-01-02 | 2018-04-17 | 东北大学设计研究院（有限公司） | A kind of process unit and method of gibbsitic bauxite twin driving |
| CN107954457A (en) * | 2018-01-11 | 2018-04-24 | 杨蕊鸿 | A kind of non-level dead steam recovery system of dissolution and technique |
| CN110937617A (en) * | 2019-12-27 | 2020-03-31 | 贵阳铝镁设计研究院有限公司 | Method for dissolution and evaporation combined process of Bayer process alumina plant |
| CN111732116A (en) * | 2020-08-14 | 2020-10-02 | 中铝山东工程技术有限公司 | Aluminium hydroxide redissolution system |
| CN112125324A (en) * | 2020-08-13 | 2020-12-25 | 山东南山铝业股份有限公司 | New steam condensate water waste heat recovery device |
| CN112209414A (en) * | 2020-09-01 | 2021-01-12 | 靖西天桂铝业有限公司 | Linkage hot test process before production of aluminum oxide |
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| CN202226757U (en) * | 2011-09-20 | 2012-05-23 | 福州开发区三水环保科技有限公司 | Sludge treatment system |
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| CN205402677U (en) * | 2016-03-04 | 2016-07-27 | 邯郸市君太节能环保科技有限公司 | Device of steam condensate water retrieval and utilization boiler based on closed is retrieved |
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| CN101671045A (en) * | 2009-10-13 | 2010-03-17 | 杭州锦江集团有限公司 | Pressure digestion system and recycling method of live steam condensed water |
| CN201610378U (en) * | 2009-12-22 | 2010-10-20 | 杭州锦江集团有限公司 | High-pressure live steam condensate residual heat recovering system |
| CN102234170A (en) * | 2010-04-29 | 2011-11-09 | 安徽合协生态环境科技有限公司 | Method and device for rapidly reducing moisture content of sludge |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107915244A (en) * | 2018-01-02 | 2018-04-17 | 东北大学设计研究院（有限公司） | A kind of process unit and method of gibbsitic bauxite twin driving |
| CN107954457A (en) * | 2018-01-11 | 2018-04-24 | 杨蕊鸿 | A kind of non-level dead steam recovery system of dissolution and technique |
| CN110937617A (en) * | 2019-12-27 | 2020-03-31 | 贵阳铝镁设计研究院有限公司 | Method for dissolution and evaporation combined process of Bayer process alumina plant |
| CN112125324A (en) * | 2020-08-13 | 2020-12-25 | 山东南山铝业股份有限公司 | New steam condensate water waste heat recovery device |
| CN111732116A (en) * | 2020-08-14 | 2020-10-02 | 中铝山东工程技术有限公司 | Aluminium hydroxide redissolution system |
| CN112209414A (en) * | 2020-09-01 | 2021-01-12 | 靖西天桂铝业有限公司 | Linkage hot test process before production of aluminum oxide |
| CN112209414B (en) * | 2020-09-01 | 2022-11-11 | 靖西天桂铝业有限公司 | Linkage hot test process before alumina production |
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Application publication date: 20170104 |