CN105016365A - Salt discharging system and method in Bayer-process aluminium oxide production process - Google Patents
Salt discharging system and method in Bayer-process aluminium oxide production process Download PDFInfo
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- CN105016365A CN105016365A CN201510441925.4A CN201510441925A CN105016365A CN 105016365 A CN105016365 A CN 105016365A CN 201510441925 A CN201510441925 A CN 201510441925A CN 105016365 A CN105016365 A CN 105016365A
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Abstract
A disclosed salt discharging system in a Bayer-process aluminium oxide production process comprises a strong-base storage tank, a salt settling tank, an overflow tank, a circulating mother liquor tank, filtering equipment and a causticization system; an evaporator-station discharging pipe in the aluminium oxide production process is communicated respectively with the strong-base storage tank and the circulating mother liquor tank; a discharge port of the strong-base tank is communicated with a feed inlet of the salt settling tank via a pump and a pipeline; the upper part of the salt settling tank is provided with an overflow pipe, and the bottom of the salt settling tank is provided with a bottom flow outlet; the overflow pipe is communicated with the overflow tank, and the bottom flow outlet is communicated with the causticization system via the filtering equipment; and a discharge port of the overflow tank is communicated with the circulating mother liquor tank via a pump and a pipeline. The invention also discloses a salt discharging method in the Bayer-process aluminium oxide production process, and the salt discharging system in the Bayer-process aluminium oxide production process is employed. Two functions such as alkali supplement and salt discharging during aluminium oxide production are both provided, running time of a forced circulation evaporator is reduced during aluminium oxide production, and energy consumption and equipment maintenance cost are reduced.
Description
Technical field
The invention belongs to field of aluminum oxide production, be specifically related to a kind of desalting system and method for Bayer process aluminum oxide production process.
Background technology
In Bayer process aluminum oxide production process, containing the impurity that sodium carbonate, sodium sulfate, sodium aluminium silicate etc. are a large amount of in sodium aluminate solution.Sodium carbonate is as one of topmost impurity, and too high concentration can crystallize out under given conditions, and cause the heat transfer coefficient of heat exchanger in system to reduce, the harm such as line clogging, all have an immense impact on to plant efficiency, continuous production.The raw material of source mainly needed for the production such as bauxite and lime of sodium carbonate, if long time integration is not got rid of, will bring serious harm to whole alumina producing.
Current technology is configured with pump feed evaporator in evaporization process, steam and electricity is utilized to carry out forced evaporation to mother liquor, promote system concentration, thus deliver to salt settling groove after crystals of sodium carbonate is separated out, after sedimentation, underflow carries out filtering and causticizing reaction.This technology needs to configure special evaporator plant, and use steam to carry out heating and concentrate and utilize electric energy to carry out pump circulation, energy consumption is large.Simultaneously because the concentration of solution is high, corrodibility is strong, and high to the requirement of equipment and tubing, maintenance cost is high.
Summary of the invention
The object of the present invention is to provide a kind of desalting system and method for Bayer process aluminum oxide production process, when the system of guarantee benefit alkali number is constant, salt discharge function can be realized.
For achieving the above object, technical scheme of the present invention is as follows:
A kind of desalting system of Bayer process aluminum oxide production process, comprise highly basic storage tank, salt settling groove, overflow groove, circulating mother liquor groove, filter plant and causticization system, the evaporator station discharge nozzle in alumina producing operation is connected with circulating mother liquor groove with highly basic storage tank respectively; The discharge port of described highly basic storage tank is communicated with the opening for feed of pipeline with salt settling groove by pump, the top of described salt settling groove be provided with upflow tube, bottom is provided with underflow outlet, and described upflow tube is communicated with overflow groove, and described underflow outlet is after filter plant and be communicated to causticization system; The discharge port of described overflow groove is communicated with circulating mother liquor groove with pipeline by pump.
The salt discharge method of Bayer process aluminum oxide production process of the present invention, applies the desalting system of described Bayer process aluminum oxide production process, comprises the steps:
A, close connecting pipeline between evaporator station discharge nozzle and circulating mother liquor groove, evaporator station circulating mother liquor out is all delivered to highly basic storage tank, until mother liquor amount reaches preset value in highly basic storage tank; The amount of liquid of this preset value salt discharge is as required considered, if it is molten long-pending to need the treatment solution scale of construction to exceed highly basic storage tank, graded processes;
The Na of mother liquor in B, mensuration highly basic storage tank
2o concentration, according to the Na of mother liquor
2o concentration and need the mother liquor amount of carrying out salt discharge process, converting to supplement adds solid sodium hydroxide amount, controls to supplement the amount of sodium hydroxide added and can ensure Na in mother liquor
2o concentration is greater than 310g/L, stirs, and is then sent into by mother liquor in salt settling groove, now closes the underflow outlet of salt settling groove;
C, mother liquor liquid level in salt settling groove slowly rises, until reach the height of upflow tube, upper strata mother liquor is flowed out by upflow tube, enters in overflow groove, then sends in circulating mother liquor groove through overflow groove;
D, after the whole salt discharge of the mother liquor in highly basic storage tank, open the connecting pipeline between evaporator station discharge nozzle and circulating mother liquor groove, allocate satisfactory circulating mother liquor and send into subsequent processing.
In described step C, after overflow groove have accumulated a certain amount of settling, open underflow outlet, be separated solid-liquid through filter plant, liquid is sent into causticization system and is processed.
The temperature of described step B and step C Whole Process Control mother liquor controls more than 90 DEG C, usually just can be ensured by the exothermic dissolution of solid sodium hydroxide, if when temperature is inadequate, can be heated up by heat exchanger heats.
In described steps A, from evaporator station out the Na of circulating mother liquor
2o concentration controls at more than 240g/l.
Beneficial effect of the present invention is:
The present invention passes through Process Route cleverly, is not needing, under prerequisite apparatus for production line being done to excessive improvement, to achieve the technique effect of achieving many things at one stroke.Utilizing the principles of chemistry of carbon alkali easy crystallization in high concentration alkali solution on the one hand, by controlling concentration of lye, reaching the object of salt discharge; Be further, the present invention devises integrated artistic flow process by again making rational planning for, do not adopt the sodium hydroxide solution that traditional salt discharge adopts, change solid into feed intake, make use of the solution heat of solid sodium hydroxide cleverly, control mother liquor temperature, prevent the generation of many aqueous carbonates salt, pump feed evaporator original in this operation can be stopped using or greatly reduce rate of utilization, reduce a large amount of energy consumptions; Meanwhile, because in Bayer process aluminum oxide production process, owing to there is alkali loss, need continuous hydrogen make-up sodium oxide in systems in which, the sodium hydroxide needing in whole system to supplement is changed to be placed in this operation and adds, both supplemented alkali lye, and also ensure that salt discharge effect.
Energy-saving effect of the present invention is very outstanding, originally often allocates 1000m
3circulating mother liquor, being equal to one group of inlet amount is 42m
3the pump feed evaporator of/h, and after having method of the present invention until now, substantially can to stop using process pump feed evaporator, with daily iron supplement as 130 ~ 150 tons of alkali numbers calculate, day saves live steam about 144 tons, and suitable steam saving 6t/h, has considerable energy-saving effect, with the scale of Bayer process alumina producing, there is very outstanding meaning.
Accompanying drawing explanation
Fig. 1 is the structural representation of desalting system of the present invention
In figure each sequence number and title as follows:
1-highly basic storage tank; 2-salt settling groove; 3-overflow groove; 4-circulating mother liquor groove; 5-filter plant; 6-causticization system; 7-upflow tube; 8-underflow exports.
Embodiment
Below by specific embodiment, the present invention is described in detail.
Embodiment 1
The desalting system of Bayer process aluminum oxide production process of the present invention, comprise highly basic storage tank 1, salt settling groove 2, overflow groove 3, circulating mother liquor groove 4, filter plant 5 and causticization system 6, the evaporator station discharge nozzle in alumina producing operation is connected with circulating mother liquor groove 5 with highly basic storage tank 2 respectively; The discharge port of described highly basic storage tank 1 is communicated with the opening for feed of pipeline with salt settling groove 2 by pump, the top of described salt settling groove 2 be provided with upflow tube 7, bottom is provided with underflow outlet 8, described upflow tube 7 is communicated with overflow groove 3, and described underflow outlet 8 is after filter plant 5 and be communicated to causticization system 6; The discharge port of described overflow groove 3 is communicated with circulating mother liquor groove 4 with pipeline by pump.
The salt discharge method of Bayer process aluminum oxide production process of the present invention, applies the desalting system of described Bayer process aluminum oxide production process, comprises the steps:
A, close connecting pipeline between evaporator station discharge nozzle and circulating mother liquor groove 5, evaporator station circulating mother liquor out is all delivered to highly basic storage tank 1, until mother liquor amount reaches 777m in highly basic storage tank 1
3;
The Na of mother liquor in B, mensuration highly basic storage tank 1
2o concentration is 249g/l, according to the Na of mother liquor
2o concentration and need the mother liquor amount of carrying out salt discharge process, converts and supplements that to add solid sodium hydroxide amount be 100 tons, stir, then sent into by mother liquor in salt settling groove 2, now close the underflow outlet 8 of salt settling groove 2;
C, mother liquor liquid level in salt settling groove 2 slowly rises, until reach the height of upflow tube 7, upper strata mother liquor is flowed out by upflow tube 7, enters in overflow groove 3, then sends in circulating mother liquor groove 4 through overflow groove 3;
D, after the whole salt discharge of the mother liquor in highly basic storage tank 1, open the connecting pipeline between evaporator station discharge nozzle and circulating mother liquor groove 5, allocate satisfactory circulating mother liquor and send into subsequent processing.
In described step C, after overflow groove 3 have accumulated a certain amount of settling, open underflow outlet 8, be separated solid-liquid through filter plant 5, liquid is sent into causticization system 6 and is processed.
The temperature of described step B and step C Whole Process Control mother liquor controls more than 90 DEG C.
In described steps A, from evaporator station out the Na of circulating mother liquor
2o concentration controls at more than 240g/l.
The evaporator station discharging composition of the present embodiment, mixed solution composition and single groove leached amount of salt are as shown in table 1.
Table 1 the present embodiment evaporator station discharging composition, mixed solution composition and single groove leached amount of salt
Embodiment 2
The desalting system of Bayer process aluminum oxide production process of the present invention, comprise highly basic storage tank 1, salt settling groove 2, overflow groove 3, circulating mother liquor groove 4, filter plant 5 and causticization system 6, the evaporator station discharge nozzle in alumina producing operation is connected with circulating mother liquor groove 5 with highly basic storage tank 2 respectively; The discharge port of described highly basic storage tank 1 is communicated with the opening for feed of pipeline with salt settling groove 2 by pump, the top of described salt settling groove 2 be provided with upflow tube 7, bottom is provided with underflow outlet 8, described upflow tube 7 is communicated with overflow groove 3, and described underflow outlet 8 is after filter plant 5 and be communicated to causticization system 6; The discharge port of described overflow groove 3 is communicated with circulating mother liquor groove 4 with pipeline by pump.
The salt discharge method of Bayer process aluminum oxide production process of the present invention, applies the desalting system of described Bayer process aluminum oxide production process, comprises the steps:
A, close connecting pipeline between evaporator station discharge nozzle and circulating mother liquor groove 5, evaporator station circulating mother liquor out is all delivered to highly basic storage tank 1, until mother liquor amount reaches 700m in highly basic storage tank 1
3;
The Na of mother liquor in B, mensuration highly basic storage tank 1
2o concentration is 245g/l, according to the Na of mother liquor
2o concentration and need the mother liquor amount of carrying out salt discharge process, converts and supplements that to add solid sodium hydroxide amount be 100 tons, stir, then sent into by mother liquor in salt settling groove 2, now close the underflow outlet 8 of salt settling groove 2;
C, mother liquor liquid level in salt settling groove 2 slowly rises, until reach the height of upflow tube 7, upper strata mother liquor is flowed out by upflow tube 7, enters in overflow groove 3, then sends in circulating mother liquor groove 4 through overflow groove 3;
D, after the whole salt discharge of the mother liquor in highly basic storage tank 1, open the connecting pipeline between evaporator station discharge nozzle and circulating mother liquor groove 5, allocate satisfactory circulating mother liquor and send into subsequent processing.
In described step C, after overflow groove 3 have accumulated a certain amount of settling, open underflow outlet 8, be separated solid-liquid through filter plant 5, liquid is sent into causticization system 6 and is processed.
The temperature of described step B and step C Whole Process Control mother liquor controls more than 90 DEG C.
In described steps A, from evaporator station out the Na of circulating mother liquor
2o concentration controls at more than 240g/l.
The evaporator station discharging composition of the present embodiment, mixed solution composition and single groove leached amount of salt are as shown in table 2.
Table 2 the present embodiment evaporator station discharging composition, mixed solution composition and single groove leached amount of salt
Embodiment 3
Simultaneous test: contrast adopts the salt discharge effect before and after salt discharge method of the present invention respectively.
Before test, liquor evaporating plant improves sodium aluminate solution concentration by forcing effect heating, and the carbonate crystallization in solution is separated out; Duration of test, liquor evaporating plant adopts evaporator station discharging mother liquor to be that solution dissolves solid sodium hydroxide, mixed solution (Nk concentration >=320g/l after dissolving, t >=90 DEG C) be sent to three phase salt settling grooves and carry out settlement separate, underflow send salt filter to carry out salt discharge operation, and overflow returns mother liquor tank as aqueous alkali and carries out allotment operation.Duration of test stops four pressure effects, and mixed solution and three is forced to imitate discharging and jointly entered three phase salt settling grooves, and whole test lasts 20 days, amounts to and changes about 3340 tons, sheet alkali.
Concrete operations are as follows: utilize three phase highly basic grooves as highly basic storage tank 1, according to the Na of evaporator station discharging
2o concentration and mother liquor gauge calculate the amount of the solid sodium hydroxide needed, dodge pressure by raising evaporation unit three and evaporator station drop temperature is brought up to more than 90 DEG C, then discharging is delivered to highly basic storage tank 1 pair of solid sodium hydroxide to dissolve, whole process strengthens mixing effect.Stir and terminate, mixed solution is transported to salt settling groove 2, and it is 60-100m that whole process need strictly controls flow
3/ h, special messenger's timing is patrolled and examined, muddy to prevent salt settling groove from running.Before and after test, the change of the leached amount of salt of leached amount of salt and unit volume is as shown in table 3.
The change of the leached amount of salt of front and back leached amount of salt and unit volume tested by table 3
As can be seen from the table, in process of the test, three phases salt discharge total amount is comparatively tested front less, major cause is that three phase ore CaO content are reduced to 0.46% from 0.8%, caused by carbon alkali entire lowering in system, but as can be seen from unit volume leached amount of salt, process of the test is belong to strengthening process to salt discharge, and every cube of mother liquor can discharge the CO of 0.37kg more
2, use salt discharge method of the present invention can replace the effect of four pressure effects completely.
According to testing program, duration of test stops four pressure effects, analyzes, the results are shown in Table 4 according to service data.
Table 4 four evaporates running condition
As seen from the table, duration of test, the steam-water ratio of four evaporations has obvious decline, and major cause is stop the cause of four pressure effects.According to the changing conditions of evaporation volume and steam-water ratio, according to the operating mode of current evaporation volume 220t/h, stopping separate unit after can calculating choline forces effect can be about 6.8t/h by steam saving, calculate with the operation factor of the live steam unit price of 150 yuan/ton and 90%, at least can steam saving cost about 8,040,000 yuan/year, visible salt discharge method of the present invention can very effective reduction steam loss.
Claims (5)
1. a desalting system for Bayer process aluminum oxide production process, comprises highly basic storage tank (1), salt settling groove (2), overflow groove (3), circulating mother liquor groove (4), filter plant (5) and causticization system (6), it is characterized in that:
Evaporator station discharge nozzle in alumina producing operation is connected with circulating mother liquor groove (5) with highly basic storage tank (2) respectively; The discharge port of described highly basic storage tank (1) is communicated with the opening for feed of pipeline with salt settling groove (2) by pump, the top of described salt settling groove (2) be provided with upflow tube (7), bottom is provided with underflow outlet (8), described upflow tube (7) is communicated with overflow groove (3), described underflow outlet (8) after filter plant (5) be communicated to causticization system (6); The discharge port of described overflow groove (3) is communicated with circulating mother liquor groove (4) with pipeline by pump.
2. a salt discharge method for Bayer process aluminum oxide production process, applies the desalting system of Bayer process aluminum oxide production process as claimed in claim 1, it is characterized in that, comprise the steps:
A, close connecting pipeline between evaporator station discharge nozzle and circulating mother liquor groove (4), evaporator station circulating mother liquor out is all delivered to highly basic storage tank (1), until the middle mother liquor amount of highly basic storage tank (1) reaches preset value (specification sheets is illustrated);
The Na of mother liquor in B, mensuration highly basic storage tank (1)
2o concentration, according to the Na of mother liquor
2o concentration and need the mother liquor amount of carrying out salt discharge process, converting to supplement adds solid sodium hydroxide amount, controls to supplement the amount of sodium hydroxide added and can ensure Na in mother liquor
2o concentration is greater than 310g/L, stirs, and is then sent into by mother liquor in salt settling groove (2), now closes underflow outlet (8) of salt settling groove (2);
C, mother liquor liquid level in salt settling groove (2) slowly rises, until reach the height of upflow tube (7), upper strata mother liquor is flowed out by upflow tube (7), enters in overflow groove (3), then sends in circulating mother liquor groove (4) through overflow groove (3);
D, after the whole salt discharge of mother liquor in highly basic storage tank (1), open the connecting pipeline between evaporator station discharge nozzle and circulating mother liquor groove (5), allocate satisfactory circulating mother liquor feeding subsequent processing.
3. the salt discharge method of Bayer process aluminum oxide production process according to claim 2, it is characterized in that: in described step C, after overflow groove (3) have accumulated a certain amount of settling, open underflow outlet (8), be separated solid-liquid through filter plant (5), liquid is sent into causticization system (6) and is processed.
4. the salt discharge method of Bayer process aluminum oxide production process according to claim 2, is characterized in that: the temperature of described step B and step C Whole Process Control mother liquor controls more than 90 DEG C.
5. the salt discharge method of Bayer process aluminum oxide production process according to claim 2, is characterized in that: in described steps A, from evaporator station out the Na of circulating mother liquor
2o concentration controls at more than 240g/l.
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Cited By (5)
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| CN105329927A (en) * | 2015-12-11 | 2016-02-17 | 东北大学设计研究院（有限公司） | Circulating mother liquor feeding device for producing aluminum oxide and feeding method |
| CN112758967A (en) * | 2021-03-08 | 2021-05-07 | 贵州华锦铝业有限公司 | Device and process for producing aluminum oxide from high-carbon bauxite |
| CN113213515A (en) * | 2021-05-10 | 2021-08-06 | 中国铝业股份有限公司 | Method and equipment for reducing carbon alkali |
| CN113912093A (en) * | 2021-09-29 | 2022-01-11 | 靖西天桂铝业有限公司 | Method for thickening evaporation mother liquor and discharging sodium carbonate salt in aluminum oxide production |
| CN114751436A (en) * | 2022-06-06 | 2022-07-15 | 贵州华锦铝业有限公司 | Process and system for producing series-parallel salt discharge in aluminum oxide production |
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Cited By (5)
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| CN114751436A (en) * | 2022-06-06 | 2022-07-15 | 贵州华锦铝业有限公司 | Process and system for producing series-parallel salt discharge in aluminum oxide production |
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