CN105314663B - Device for recycling red mud disposal backwater in aluminum oxide plant and use method of device - Google Patents
Device for recycling red mud disposal backwater in aluminum oxide plant and use method of device Download PDFInfo
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- CN105314663B CN105314663B CN201510925870.4A CN201510925870A CN105314663B CN 105314663 B CN105314663 B CN 105314663B CN 201510925870 A CN201510925870 A CN 201510925870A CN 105314663 B CN105314663 B CN 105314663B
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Abstract
The invention discloses a device for recycling red mud disposal backwater in an aluminum oxide plant and a use method of the device, and belongs to the field of mineral processing. The device for recycling red mud disposal backwater in the aluminum oxide plant comprises a red mud disposal backwater tank, a red mud disposal backwater pump, a first plate type heat exchanger, a second plate type heat exchanger, a third plate type heat exchanger, a cooling tower, a secondary steam condensation pump, a red mud washing depositing tank, an online pH value adjuster, a dissolved primary vapor condensation water conveying device, a primary evaporated vapor condensation water conveying device, a secondary evaporated steam condensation conveying device, a secondary evaporated steam condensation water source, a primary evaporated vapor condensation water source and a dissolved primary vapor condensation water source. The method for recycling red mud disposal backwater in the aluminum oxide plant comprises the following steps: (1) performing primary heat exchange; (2) performing secondary heat exchanger; (3) performing third heat exchange. By adopting the device and the method for recycling red mud disposal backwater in the aluminum oxide plant, the purposes of reasonable configuration, energy conservation, investment reduction and production cost reduction can be achieved.
Description
Technical field
The invention belongs to mineral manufacture field, more particularly to a kind of recycle device of red mud for alumina plant stockyard backwater
And its using method.
Background technology
Background one：At present, in the technological process of alumina producing, the utilization of red mud dump backwater is very crucial step
Suddenly, Indonesia, Guinea etc. have plenty of rain area it is newly-built, to plan to build the greatest problem that alumina producer runs into be local rainfall
Greatly, typically in 3000～4000mm, rainfall is uneven, typical dry season, rainy season is presented, after contaminated charge for remittance such as takes process
Apply outward, either construction cost or operating cost, be all sizable burden to enterprise.
Background two：In alumina producing Bayer process technological process, laterite washing water is one of maximum use water spot, in the past
Flow process is all that aluminum oxide each condensed water in workshop and the recirculated water of water channel are heated to 95 ± 1 DEG C after hot water station workshop is converged,
Red-mud separation and draining room washing red mud is sent to again.
Background three：Aluminum oxide production self-owned power plant boiler needs to use water in a large number, and conventional flow process aluminum oxide workshop is only a small amount of
Dissolution, the live steam condensed water of evaporation are returned directly to power plant and use for which, and most of water needs new water to supplement, and initial steam condensation
Coolant-temperature gage is too high, need to do cooling process.
The equipment that 3 process procedures of the above are related to includes red mud dump back water pump, live steam condensed water pump, evaporates secondary
Vapour condensate pump, hot water storgae, steam water heater, red mud wash water pump etc., are respectively distributed between red mud dump back water pump caravan, dissolution
Workshop, liquor evaporating plant, hot water station workshop, the technological process production cost is high, production procedure is complicated, labor cost is high, waste
Resource.
The content of the invention
For the problem that prior art is present, the present invention provide the recycle device of red mud for alumina plant stockyard backwater and
Its using method, reaches reasonable configuration, energy saving, the purpose for reducing investment, saving production cost.
The recycle device of the red mud for alumina plant stockyard backwater of the present invention, including red mud dump back pool, red mud
Field back water pump, the first plate type heat exchanger, the second plate type heat exchanger, three-plate type heat exchanger, cooling tower, secondary vapour condensate pump,
Laterite washing subsider, pH value on-line control device, dissolution live steam condensed water conveying device, evaporation live steam condensed water conveying dress
Put, evaporate secondary vapour and condense water conveying device, evaporate secondary vapour condensation water, evaporation live steam condensed water source, dissolution initial steam
Condensation water；
Wherein, red mud dump back pool is connected with red mud dump back water pump, and red mud dump back water pump is board-like with first to be changed
The first input end of hot device is connected；Evaporate secondary vapour condensation water to be connected with the second input of the first plate type heat exchanger,
First the first output end of plate type heat exchanger is connected with the first input end of the second plate type heat exchanger, and the of the first plate type heat exchanger
Two output ends are connected with cooling tower input；Cooling tower output end is connected with time condensation water pump input, time condensation
Water pump output end is connected with one end of PH on-line control devices, and the other end of PH on-line control devices is defeated with the secondary vapour condensed water of evaporation
Device is sent to be connected；Evaporation live steam condensed water source is connected with second the second input of plate type heat exchanger, the second plate-type heat-exchange
First output end of device is connected with evaporation live steam condensed water conveying device, the second output end of the second plate type heat exchanger and the
The first input end of three-plate type heat exchanger is connected；Dissolution live steam condensed water source and the second input of three-plate type heat exchanger
It is connected, the first output end of three-plate type heat exchanger is connected with dissolution live steam condensed water conveying device, and three-plate type is changed
Second output end of hot device is connected with subsider.
The using method of the recycle device of red mud for alumina plant stockyard of the present invention backwater, comprises the following steps：
Step 1, once exchange heat：
The red mud dump backwater that temperature is 28～32 DEG C is introduced from red mud dump back pool, it is defeated by red mud dump back water pump
It is sent in alumina producer；By plate type heat exchanger, the secondary vapour condensed water of evaporation of 68～72 DEG C of red mud dump backwater and temperature enters
Row once exchanges heat；After heat exchange, red mud dump return water temperature rises to 53～57 DEG C, evaporates secondary vapour condensate temperature and drops to 38
～42 DEG C；The secondary vapour condensed water of evaporation that temperature is 38～42 DEG C is cooled to after 28～32 DEG C, by pH value by cooling tower
On-line control device, after the water quality of the secondary vapour condensed water of evaporation reaches power plant water requirement (PH=7.0), using evaporating, secondary vapour is cold
Solidifying water conveying device is sent to power plant by secondary vapour condensed water is evaporated；
Step 2, secondary heat exchange：
By plate type heat exchanger, the temperature after once exchanging heat be 53～57 DEG C of red mud dump backwater and temperature be 113～
117 DEG C of evaporation live steam condensed water carries out secondary heat exchange, and after heat exchange, red mud dump return water temperature rises to 73～77 DEG C；Steam
Live steam condensed water temperature drop is sent out to 58～62 DEG C, evaporation live steam condensed water is passed through to evaporate live steam condensed water conveying dress
Conveying is put toward power plant；
Step 3, three heat exchange：
By plate type heat exchanger, 168～172 DEG C of red mud dump backwater and the temperature of 73～77 DEG C of the temperature after secondary heat exchange
Dissolution live steam condensed water carry out three times heat exchange, after heat exchange, red mud dump return water temperature rises to 93～97 DEG C, by red mud
Backwater is transported to laterite washing subsider, separated and washed reach red mud wash water use water requirement；Dissolution initial steam is cold
Solidifying coolant-temperature gage drops to 123～127 DEG C, and dissolution live steam condensed water is sent to electricity by dissolution live steam condensed water conveying device
Factory.
In above-mentioned steps 1～3, to count on an hourly basis, the ratio of red mud dump circling water flow rate and aluminum oxide yield is 3.2～
3.5, liquor evaporating plant produces the ratio 2.8～3.5 of secondary gas condensate flow and aluminum oxide yield, and liquor evaporating plant produces initial steam
The ratio 1.1～1.2 of condensate flow and aluminum oxide yield, digestion workshop produce live steam condensed water flow and aluminum oxide yield
Ratio 1.55～1.7.
In above-mentioned steps 1～3, red mud for alumina plant stockyard backwater is condensed with the secondary vapour condensed water of evaporation, evaporation initial steam
After water and dissolution live steam condensed water and heat exchange, for laterite washing process system.
In above-mentioned steps 1～3, exchanged heat according to formula (1) in heat transfer process：
Q=qm1(H1-H2)=qm2(h2-h1) (1)
Wherein, Q is thermic load, W；qm1For the mass flow of hot fluid, kg/s；qm2For the mass flow of cold flow body, kg/
s；H1The specific enthalpy of hot fluid inlet, J/kg；H2For the specific enthalpy of hot fluid outlet ports, J/kg；h1For the specific enthalpy of cold fluid inlet, J/kg；
h2For the specific enthalpy of cold fluid outlet, J/kg.
In above-mentioned steps 1, red mud dump backwater derives from red mud for alumina plant stockyard back pool；Evaporate secondary vapour condensed water
From alumina evaporation workshop.
In above-mentioned steps 2, evaporation live steam condensed water derives from alumina evaporation workshop.
In above-mentioned steps 3, dissolution live steam condensed water derives from alumina leaching workshop.
The using method of the recycle device of the red mud for alumina plant stockyard backwater of the present invention, compared with prior art,
Beneficial effect is：
1st, the using method of the recycle device of red mud for alumina plant stockyard backwater of the invention, the red of discarded outer row
Mud stockyard backwater is used for alumina technology system, reduces the full factory's water consume of aluminum oxide, saves production cost, saving water resource.
2nd, the using method of the recycle device of red mud for alumina plant stockyard backwater of the invention, alumina producer is condensed
It is used for power plant after water process, reduces power plant's water consume, saves power plant's production cost.
3rd, the using method of the recycle device of red mud for alumina plant stockyard backwater of the invention, alumina producer is condensed
Water carries out heat exchange utilization with red mud dump backwater, saves alumina producer initial steam consumption, reduces the cooling that power plant processes condensed water
Cost, greatlys save full factory's production and operation cost.
Description of the drawings
Fig. 1 is the schematic flow sheet of the recycle device of embodiment of the present invention red mud for alumina plant stockyard backwater；
Wherein, 1- red mud dumps back pool；2- red mud dump back water pumps；The first plate type heat exchangers of 3-；4- second is board-like to be changed
Hot device；5- three-plate type heat exchangers；6- cooling towers；Bis- vapour condensate pumps of 7-；8- laterite washing subsiders；9-PH values are adjusted online
Section device；10- dissolution live steam condensed water conveying devices；11- evaporates live steam condensed water conveying device；It is cold that 12- evaporates secondary vapour
Solidifying water conveying device；13- evaporates secondary vapour condensation water；14- evaporation live steam condensed waters source；15- dissolution live steam condensed waters
Source.
Specific embodiment
The recycle device of the red mud for alumina plant stockyard backwater of the present invention, including red mud dump back pool 1, red mud
Field back water pump 2, the first plate type heat exchanger 3, the second plate type heat exchanger 4, three-plate type heat exchanger 5, cooling tower 6, secondary vapour condensation
Water pump 7, laterite washing subsider 8, pH value on-line control device 9, dissolution live steam condensed water conveying device 10, evaporation initial steam are cold
Solidifying water conveying device 11, evaporates secondary vapour and condenses water conveying device 12, evaporates secondary vapour condensation water 13, evaporation initial steam condensation
Water source 14, dissolution live steam condensed water source 15；
Wherein, red mud dump back pool 1 is connected with red mud dump back water pump 2, and red mud dump back water pump 2 is board-like with first
The first input end of heat exchanger 3 is connected；Evaporate the second input phase of secondary vapour condensation water 13 and the first plate type heat exchanger 3
Connection, 3 first output end of the first plate type heat exchanger is connected with the first input end of the second plate type heat exchanger 4, and first board-like changes
Second output end of hot device 3 is connected with 6 input of cooling tower；6 output end of cooling tower is connected with 7 input of time condensation water pump
Logical, 7 output end of time condensation water pump is connected with one end of PH on-line controls device 9, the other end of PH on-line controls device 9 and evaporation
Secondary vapour condensation water conveying device 12 is connected；Evaporation 4 second input of live steam condensed water source 14 and the second plate type heat exchanger
It is connected, the first output end of the second plate type heat exchanger 4 is connected with evaporation live steam condensed water conveying device 11, and second is board-like
Second output end of heat exchanger 4 is connected with the first input end of three-plate type heat exchanger 5；Dissolution live steam condensed water source 15 with
Second input of three-plate type heat exchanger 5 is connected, and the first output end and the dissolution initial steam of three-plate type heat exchanger 5 are condensed
Water conveying device 10 is connected, and the second output end of three-plate type heat exchanger 5 is connected with subsider 8.
Schematic flow sheet such as Fig. 1 institutes of the recycle device of the red mud for alumina plant stockyard backwater of the embodiment of the present invention
Show.So that alumina producer produces 1000kt aluminum oxide per year as an example, the flow of red mud dump backwater is 320～350t/h to embodiment, is evaporated
The flow of secondary vapour condensed water is 280～300t/h, and the flow for evaporating live steam condensed water is 110～120t/h, and dissolution newly steams
The flow of vapour condensed water is 155～170t/h.
The using method of the recycle device of the red mud for alumina plant stockyard backwater of the present embodiment, comprises the following steps：
Step 1, once exchange heat：
The red mud dump backwater that temperature is 30 DEG C is introduced from red mud dump back pool 1, is conveyed by red mud dump back water pump 2
To in alumina producer；By the first plate type heat exchanger 3, temperature is the secondary vapour of evaporation of 30 DEG C of red mud dump backwater and temperature 70 C
Condensed water is once exchanged heat；After heat exchange, red mud dump return water temperature rises to 55.7 DEG C, and flow is constant, evaporates secondary vapour cold
Solidifying coolant-temperature gage drops to 40 DEG C, and flow is constant；The secondary vapour condensed water of evaporation that temperature is 40 DEG C is cooled to into 30 by cooling tower 6
After DEG C, by pH value on-line control device 9, after the water quality of the secondary vapour condensed water of evaporation reaches power plant water requirement (PH=7.0), adopt
Power plant is sent to secondary vapour condensation water conveying device 12 is evaporated by secondary vapour condensed water is evaporated；
Step 2, secondary heat exchange：
By the second plate type heat exchanger 4, it is 115 with temperature that the temperature after once exchanging heat is 55.7 DEG C of red mud dump backwater
DEG C evaporation live steam condensed water carry out secondary heat exchange, after heat exchange, red mud dump return water temperature rises to 74.6 DEG C, and flow is not
Become；To 60 DEG C, flow is constant for evaporation live steam condensed water temperature drop；Will be evaporation live steam condensed water cold by evaporating initial steam
Solidifying water conveying device 11 is sent to power plant；
Step 3, three heat exchange：
By three-plate type heat exchanger 5,168 DEG C of red mud dump backwater and the temperature of 74.6 DEG C of the temperature after secondary heat exchange
Dissolution live steam condensed water carries out three heat exchange, and after heat exchange, red mud dump return water temperature rises to 95 DEG C, and flow is constant, will be red
Mud stockyard backwater is transported to laterite washing subsider 8, separated and washed reach red mud wash water use water requirement；Dissolution is newly steamed
Vapour condensate temperature drops to 126 DEG C, and flow is constant, by dissolution live steam condensed water by dissolution live steam condensed water conveying dress
Put 10 and be sent to power plant.
Claims (5)
1. the recycle device of a kind of red mud for alumina plant stockyard backwater, it is characterised in that including red mud dump back pool, red
Mud stockyard back water pump, the first plate type heat exchanger, the second plate type heat exchanger, three-plate type heat exchanger, cooling tower, secondary vapour condensed water
Pump, laterite washing subsider, pH value on-line control device, dissolution live steam condensed water conveying device, evaporation live steam condensed water are defeated
Device is sent, secondary vapour is evaporated and is condensed water conveying device, evaporate secondary vapour condensation water, evaporation live steam condensed water source, dissolution are new
Steam condensate (SC) source；
Wherein, red mud dump back pool is connected with red mud dump back water pump, red mud dump back water pump and the first plate type heat exchanger
First input end be connected；Evaporate secondary vapour condensation water to be connected with the second input of the first plate type heat exchanger, first
The first output end of plate type heat exchanger is connected with the first input end of the second plate type heat exchanger, and the second of the first plate type heat exchanger is defeated
Go out end to be connected with cooling tower input；Cooling tower output end is connected with time condensation water pump input, time condensation water pump
Output end is connected with one end of PH on-line control devices, the other end and the secondary vapour condensed water conveying dress of evaporation of PH on-line control devices
Put and be connected；Evaporation live steam condensed water source is connected with second the second input of plate type heat exchanger, the second plate type heat exchanger
First output end is connected with evaporation live steam condensed water conveying device, the second output end and the 3rd plate of the second plate type heat exchanger
The first input end of formula heat exchanger is connected；Dissolution live steam condensed water source is connected with the second input of three-plate type heat exchanger
Logical, the first output end of three-plate type heat exchanger is connected with dissolution live steam condensed water conveying device, three-plate type heat exchanger
The second output end be connected with subsider.
2. the using method of the recycle device of the red mud for alumina plant stockyard backwater described in claim 1, it is characterised in that
Comprise the following steps：
Step 1, once exchange heat：
The red mud dump backwater that temperature is 28～32 DEG C is introduced from red mud dump back pool, is pumped into by red mud dump backwater
In alumina producer；By plate type heat exchanger, red mud dump backwater carries out one with the secondary vapour condensed water of evaporation of 68～72 DEG C of temperature
Secondary heat exchange；After heat exchange, red mud dump return water temperature rises to 53～57 DEG C, evaporates secondary vapour condensate temperature and drops to 38～42
℃；The secondary vapour condensed water of evaporation that temperature is 38～42 DEG C is cooled to after 28～32 DEG C by cooling tower, it is online by pH value
Adjuster, after the water quality of the secondary vapour condensed water of evaporation reaches power plant water requirement, condenses water conveying device using secondary vapour is evaporated
Secondary vapour condensed water will be evaporated and be sent to power plant；
Step 2, secondary heat exchange：
By plate type heat exchanger, it is 113～117 DEG C with temperature that the temperature after once exchanging heat is 53～57 DEG C of red mud dump backwater
Evaporation live steam condensed water carry out secondary heat exchange, after heat exchange, red mud dump return water temperature rises to 73～77 DEG C；Evaporation is new to steam
Vapour condensate temperature drops to 58～62 DEG C, and evaporation live steam condensed water is conveyed by evaporating live steam condensed water conveying device
Toward power plant；
Step 3, three heat exchange：
By plate type heat exchanger, 168～172 DEG C of red mud dump backwater and the temperature of 73～77 DEG C of the temperature after secondary heat exchange it is molten
Going out live steam condensed water carries out three heat exchange, and after heat exchange, red mud dump return water temperature rises to 93～97 DEG C, and red mud dump is returned
Water is transported to laterite washing subsider, separated and washed reach red mud wash water use water requirement；Dissolution live steam condensed water
Dissolution live steam condensed water is sent to power plant by dissolution live steam condensed water conveying device by temperature drop to 123～127 DEG C.
3. the using method of the recycle device of red mud for alumina plant stockyard according to claim 2 backwater, its feature
It is, in described step 1～3, to count on an hourly basis, the ratio of red mud dump circling water flow rate and aluminum oxide yield is 3.2～
3.5, liquor evaporating plant produces the ratio 2.8～3.5 of secondary gas condensate flow and aluminum oxide yield, and liquor evaporating plant produces initial steam
The ratio 1.1～1.2 of condensate flow and aluminum oxide yield, digestion workshop produce live steam condensed water flow and aluminum oxide yield
Ratio 1.55～1.7.
4. the using method of the recycle device of red mud for alumina plant stockyard according to claim 2 backwater, its feature
It is, in described step 1～3, red mud for alumina plant stockyard backwater and the secondary vapour condensed water of evaporation, evaporation live steam condensed water
After dissolution live steam condensed water and heat exchange, for laterite washing process system.
5. the using method of the recycle device of red mud for alumina plant stockyard according to claim 2 backwater, its feature
It is that, in described step 1, red mud dump backwater derives from red mud for alumina plant stockyard back pool；Evaporate secondary vapour condensed water
From alumina evaporation workshop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510925870.4A CN105314663B (en) | 2015-12-11 | 2015-12-11 | Device for recycling red mud disposal backwater in aluminum oxide plant and use method of device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510925870.4A CN105314663B (en) | 2015-12-11 | 2015-12-11 | Device for recycling red mud disposal backwater in aluminum oxide plant and use method of device |
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| CN105314663A CN105314663A (en) | 2016-02-10 |
| CN105314663B true CN105314663B (en) | 2017-03-22 |
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| CN109373786A (en) * | 2018-09-21 | 2019-02-22 | 茌平信发华宇氧化铝有限公司 | Alumina production line and boiler of power plant resource reutilization linked system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101398262A (en) * | 2007-09-29 | 2009-04-01 | 沈阳铝镁设计研究院 | Direct heating method and apparatus for pulp |
| CN202016882U (en) * | 2010-12-26 | 2011-10-26 | 中铝国际技术发展有限公司 | Heat energy recovery device for live steam condensate water of whole plant during aluminium oxide production |
| CN102531007A (en) * | 2010-12-26 | 2012-07-04 | 中铝国际技术发展有限公司 | Whole plant live steam condensed water heat energy recycling device of aluminum oxide production |
| CN103723747A (en) * | 2012-10-15 | 2014-04-16 | 沈阳铝镁设计研究院有限公司 | Method used for reducing steam used for heating red mud washing water |
| CN205258028U (en) * | 2015-12-11 | 2016-05-25 | 东北大学设计研究院（有限公司） | Recycle device of oxidation aluminium manufacturer red mud store yard return water |
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