CN114853233A - Water making device for evaporating secondary condensate in alumina production - Google Patents

Abstract

The invention relates to a water production device for evaporating secondary condensate in alumina production, belongs to the technical field of secondary condensate utilization in an evaporation process, and solves the technical problems of high water production cost, water resource waste and the like of the traditional raw water. The solution is as follows: a water making device for evaporating secondary condensate in alumina production comprises a heat exchange device, a mechanical stirring clarification tank, a quartz sand filter, a cation-anion bed ion exchanger and a mixed bed ion exchanger; mechanical stirring clarification tank includes the support and locates the cell body of support top surface, middle upper portion is provided with the mixing stirring district in the cell body, from up being settling zone, filler district and clarification district down in proper order in the outer cell body inner chamber of mixing stirring district, be provided with agitating unit in the mixing stirring district, be provided with the mud scraping device in the settling zone. The invention has simple structure, fully utilizes and treats the secondary condensate of the evaporation process, saves resources and reduces waste.

Description

Water making device for evaporating secondary condensate in alumina production

Technical Field

The invention belongs to the technical field of secondary condensate utilization in an evaporation process, and particularly relates to a water production device for evaporating secondary condensate in alumina production.

Background

The water for the boiler of the power plant has higher test index requirements, and desalted water is required to be used, wherein the desalted water is finished water obtained after impurities in water such as suspended matters, colloid, inorganic cations, anions and the like are removed. The existing method for producing desalted water is to use raw water (well water or river water, etc.) to produce desalted water meeting the water index of boiler after being treated by desalter, and then the desalted water is heated and deoxidized by deaerator and is pressurized by feed pump and sent to boiler to continuously produce steam. The raw water desalting device is characterized in that raw water is subjected to turbidity reduction through a mechanical stirring clarification tank, filtered through a quartz sand filter, subjected to ultrafiltration and reverse osmosis physical desalting, and subjected to chemical desalting through a mixed bed to reach a desalting water standard and then supplied to a boiler.

The cost of the desalted water prepared by the physical desalting method at the present stage is about 6 yuan/ton, the daily consumption of the desalted water is 7200 tons, and the total cost of the desalted water is about 4.32 ten thousand yuan; the maximum recovery rate of qualified desalted water prepared by the raw water desalting equipment at the present stage reaches 75%, and the rest 25% of water still needs to be discharged, so that the problems of water resource waste and high water preparation cost exist; if the amount of desalted water generated by the raw water is insufficient, the production line can be stopped.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, provides a water production device utilizing evaporated secondary condensate in the production of alumina, and solves the technical problems of high water production cost, water resource waste and the like of the traditional raw water.

In order to solve the problems, the technical scheme of the invention is as follows: a water making device for evaporating secondary condensate in alumina production, wherein: comprises a heat exchange device, a mechanical stirring clarification tank, a quartz sand filter, an anion-cation bed ion exchanger and a mixed bed ion exchanger;

the evaporation secondary condensate is connected with a heat exchange device through a connecting pipe, the heat exchange device is connected with a mechanical stirring clarification tank through a connecting pipe, the mechanical stirring clarification tank is connected with a quartz sand filter through a connecting pipe, the quartz sand filter is connected with an anion-cation bed ion exchanger through a connecting pipe, and the anion-cation bed ion exchanger is connected with a mixed bed ion exchanger through a connecting pipe;

the mechanical stirring clarification tank comprises a support and a tank body arranged on the top surface of the support, a mixing and stirring area is arranged at the upper part of the middle in the tank body, and a settling area, a filling area and a clarification area are sequentially arranged in an inner cavity of the tank body outside the mixing and stirring area from bottom to top; an overflow groove is arranged in the clarification area, the bottom surface of the overflow groove is inclined, the opposite side wall of the tank body at the lowest position of the bottom surface of the overflow groove is provided with a water outlet, and the bottom surface of the tank body is provided with a sludge outlet;

the pond body lateral wall of filler district below is provided with the water inlet and advances the oxalic acid mouth, the water inlet passes through the inlet tube and mixes the stirring district intercommunication, advance the oxalic acid mouth through advancing oxalic acid pipe and mixing the stirring district intercommunication, be provided with agitating unit in the mixing and stirring district, be provided with mud scraping device in the settling zone.

Furthermore, a first flow regulating valve is arranged on a connecting pipe between the heat exchange device and the mechanical stirring clarification tank, a second flow regulating valve is arranged on the oxalic acid inlet pipe, and a mud valve is arranged at the mud outlet.

Further, the heat exchange device is a plate heat exchanger.

Further, the bottom of the tank body is of an inverted cone structure.

Further, the mud scraping device comprises a mud scraping driving motor, a mud scraping shaft and a plurality of groups of mud scraping plates, the middle part of the lower part of the pool body is vertically upwards arranged on the mud scraping driving motor, the bottom of the mud scraping shaft is vertically arranged in the pool body, the bottom end of the mud scraping shaft penetrates through the bottom wall of the pool body and is fixedly connected with the output shaft of the mud scraping driving motor in a coaxial mode, the mud scraping shaft side walls are evenly distributed on the mud scraping plates, and the mud scraping driving motor drives the mud scraping shaft and the mud scraping plates to rotate.

Further, the mud scraper includes horizontal scraper blade and locates the slope scraper blade of horizontal scraper blade one end, the distance between slope scraper blade and the cell body bottom lateral wall, between horizontal scraper blade and the cell body bottom surface is 3 ~ 5 mm.

Further, a honeycomb packing inclined tube is arranged in the packing area.

Further, mix the stirring district and be provided with churn and guide cylinder, the guide cylinder is vertical to be located the cell body middle part just guide cylinder top and cell body top surface fixed connection, the churn is coaxial to be located in the guide cylinder, connect through the multiunit fixed plate between churn and the guide cylinder, the churn bottom is the back taper structure, the churn bottom is provided with the valve, churn top surface edge is provided with the arc.

Further, agitating unit includes stirring driving motor, (mixing) shaft and a plurality of stirring paddle leaf of group, the cell body top surface is located downwards to stirring driving motor is vertical, during the churn is located to the (mixing) shaft is vertical, just after the cell body top surface is passed on the (mixing) shaft top with the coaxial fixed connection of output shaft of stirring driving motor, (mixing) shaft lateral wall is located to the stirring paddle leaf equipartition, stirring driving motor drive (mixing) shaft and stirring paddle leaf rotate.

Further, the water inlet pipe comprises a first water inlet pipe and a second water inlet pipe, the second water inlet pipe is of a half arc circular pipe structure, the second water inlet pipe is arranged on the side wall of the mixing drum, water gaps are uniformly distributed on the bottom surface of the second water inlet pipe, one end of the first water inlet pipe is connected with the water inlet, and the other end of the first water inlet pipe penetrates through the guide drum and the side wall of the mixing drum to be communicated with the second water inlet pipe;

it advances the oxalic acid pipe including first entering oxalic acid pipe and second to advance the oxalic acid pipe, the second advances the oxalic acid pipe and is half circular arc pipe structure, the second advances the oxalic acid pipe and sets up with the second inlet tube relatively, the second advances the oxalic acid pipe and locates the churn lateral wall, the second advances oxalic acid pipe bottom surface equipartition and is provided with the oxalic acid mouth, first advance oxalic acid pipe one end with advance the oxalic acid mouth and be connected, the other end passes guide cylinder and churn lateral wall and second and advances the oxalic acid pipe intercommunication.

Compared with the prior art, the invention has the beneficial effects that:

compared with a raw water physical desalting water production device, the cost of secondary condensate water production is about 0.6 yuan/t, is reduced by 5.4 yuan/ton compared with the cost of raw water desalted water, and meanwhile, the secondary condensate can be recovered and evaporated by 100%, so that the process water balance of an alumina production line is realized, the discharge loss is reduced, the raw water consumption is reduced, and the raw water physical desalting water production device and the secondary condensate water production device can be mutually standby, and the stable production is ensured.

From the water quality: because the secondary condensate generated after heat absorption is evaporated by indirect heat exchange between the alumina decomposition stock solution and the steam of the heating chamber of the evaporator, the quality of the secondary condensate is better than that of the stock water, and because the secondary condensate contains fewer anions, cations and impurities, the water production cost is relatively reduced.

Comparing the water quality of the raw water with that of the secondary condensate:

the invention uses the plate heat exchanger, mechanical stirring clarification tank, quartz sand filter, anion and cation bed ion exchanger and mixed bed ion exchanger, the secondary condensate in the evaporation process is sent to the plate heat exchanger by the pump body to cool, the temperature is reduced from about 70 ℃ to below 40 ℃, then the secondary condensate enters the mechanical stirring clarification tank to be uniformly mixed with oxalic acid for chemical reaction, the precipitate of aluminum oxalate is produced, metal ions such as aluminum are removed from water, then the precipitate is filtered by the quartz sand filter, enters the anion and cation bed ion exchanger for chemical desalting, then enters the mixed bed ion exchanger for chemical desalting again, and the desalted water reaching the qualified index is supplied to the boiler.

Water after the secondary condensate cooling in the evaporation process is sent into the churn through the inlet tube from the water inlet, oxalic acid is sent into the churn through advancing the oxalic acid pipe from advancing the oxalic acid mouth simultaneously, under agitating unit's effect, water and oxalic acid carry out the intensive mixing, spill over from the arc of churn top after mixing, fall into in the precipitation zone, deposit in the precipitation zone, clear water passes through and goes into in the overflow launder behind the filler region and see off from the delivery port, inlet tube and the setting of entering oxalic acid tube structure, the intensive mixing of water and oxalic acid of being convenient for, the efficiency of precipitating is improved, and then water efficiency is made to the system has been improved.

The invention utilizes the secondary condensate of the evaporation process, the water yield of the recovered desalted water can reach 100 percent, the waste of water can not be caused, the water production cost is reduced, the restriction of the insufficient yield of the desalted water interrupted by the raw water on the continuous production of the process is avoided, the process difficulty that the amount of the sodium aluminate solution is unbalanced caused by the supplement of water, the primary and secondary steam condensate and the return of the red mud dry-discharge filtrate in the existing alumina production process is overcome, the water production device utilizing the evaporated secondary condensate in the alumina production is provided, the problem of unbalanced amount of the alumina liquid is solved, and the technical problems of low utilization rate of the desalted water, high water production cost, water resource waste and the like in the traditional raw water production by using desalting equipment adopting a chemical and physical method are solved.

The invention has simple structure, fully utilizes and treats the secondary condensate of the evaporation process, saves resources and reduces waste.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of a mechanical stirring clarifier of the present invention;

FIG. 3 is a schematic structural view of the mud scraping device of the present invention;

FIG. 4 is a schematic view of the mixing and stirring section of the present invention;

FIG. 5 is a bottom view of FIG. 4;

FIG. 6 is a schematic view of the structure of a stirring apparatus according to the present invention;

fig. 7 is a view a-a in fig. 2.

Detailed Description

The invention is described in further detail below with reference to the figures and examples.

A water making device using evaporated secondary condensate in alumina production as shown in fig. 1 to 7, wherein: comprises a heat exchange device 1, a mechanical stirring clarification tank 2, a quartz sand filter 3, a cation-anion bed ion exchanger 4 and a mixed bed ion exchanger 5; the secondary condensate 6 of evaporation is at first cooled down through heat transfer device 1, then flocculates in mechanical stirring clarification tank 2 and gets rid of, then filters through quartz sand filter 3, gets into anion and cation bed ion exchanger 4 and carries out chemical desalination, and the chemical desalination once more that gets into mixed bed ion exchanger 5 again, and the demineralized water that reaches qualified index supplies each water point.

The evaporation secondary condensate 6 is connected with a heat exchange device 1 through a connecting pipe, the heat exchange device 1 is connected with a mechanical stirring clarification tank 2 through a connecting pipe, the mechanical stirring clarification tank 2 is connected with a quartz sand filter 3 through a connecting pipe, the quartz sand filter 3 is connected with an anion-cation bed ion exchanger 4 through a connecting pipe, and the anion-cation bed ion exchanger 4 is connected with a mixed bed ion exchanger 5 through a connecting pipe;

the mechanical stirring clarification tank 2 comprises a bracket 2-1 and a tank body 2-2 arranged on the top surface of the bracket 2-1, the bracket 2-1 is used for supporting the tank body 2-2,

a mixing and stirring area 2-3 is arranged at the upper part of the middle in the tank body 2-2, and a sedimentation area 2-4, a filling area 2-5 and a clarification area 2-6 are sequentially arranged in the inner cavity of the tank body 2-2 outside the mixing and stirring area 2-3 from bottom to top; an overflow groove 2-7 is arranged in the clarification zone 2-6, the bottom surface of the overflow groove 2-7 is inclined to facilitate the outflow of clear liquid, a water outlet 2-2-1 is arranged on the opposite side wall of the tank body 2-2 at the lowest part of the bottom surface of the overflow groove 2-7, and a sludge outlet 2-2-2 is arranged on the bottom surface of the tank body 2-2; water and oxalic acid are fully mixed in a mixing and stirring area 2-3, then enter a settling area 2-4, then sequentially pass through a filling area 2-5 and a clarifying area 2-6, then enter an overflow tank 2-7, are discharged from a water outlet 2-2-1, and precipitate falls into the settling area 2-4 and is discharged from a sludge outlet 2-2-2.

The side wall of the tank body 2-2 below the filler zone 2-5 is provided with a water inlet 2-2-3 and an oxalic acid inlet 2-2-4, the water inlet 2-2-3 is communicated with the mixing and stirring zone 2-3 through a water inlet pipe 2-8, the oxalic acid inlet 2-2-4 is communicated with the mixing and stirring zone 2-3 through an oxalic acid inlet pipe 2-9, a stirring device 2-10 is arranged in the mixing and stirring zone 2-3, and a mud scraping device 2-11 is arranged in the settling zone 2-4.

Further, a first flow regulating valve 6-1 is arranged on a connecting pipe between the heat exchange device 1 and the mechanical stirring clarification tank 2, a second flow regulating valve 6-2 is arranged on the oxalic acid inlet pipe 2-9, and a sludge discharge valve 6-3 is arranged at the sludge outlet 2-2-2. The first flow regulating valve 6-1 is used for regulating the flow of water, the second flow regulating valve 6-2 is used for regulating the flow of input oxalic acid, and the sludge discharge valve 6-3 is used for controlling sludge discharge.

Further, the heat exchange device 1 is a plate heat exchanger. The plate heat exchanger has compact structure and high heat exchange efficiency.

Further, the bottom of the tank body 2-2 is of an inverted cone structure. The arrangement of the inverted cone structure is convenient for the sediment discharge of the sediment.

Further, the mud scraping device 2-11 comprises a mud scraping driving motor 2-11-1, a mud scraping shaft 2-11-2 and a plurality of groups of mud scraping plates 2-11-3, the mud scraping driving motor 2-11-1 is vertically arranged at the middle part below the tank body 2-2 upwards, the mud scraping shaft 2-11-2 is vertically arranged at the bottom in the tank body 2-2, the bottom end of the mud scraping shaft 2-11-2 penetrates through the bottom wall of the tank body 2-2 and then is coaxially and fixedly connected with an output shaft of a mud scraping driving motor 2-11-1, a plurality of groups of mud scraping plates 2-11-3 are uniformly distributed on the side wall of the mud scraping shaft 2-11-2, the mud scraping driving motor 2-11-1 drives the mud scraping shaft 2-11-2 and the mud scraping plate 2-11-3 to rotate.

Further, the mud scraping plate 2-11-3 comprises a horizontal scraping plate 2-11-4 and an inclined scraping plate 2-11-5 arranged at one end of the horizontal scraping plate 2-11-4, and the distances between the inclined scraping plate 2-11-5 and the side wall of the bottom of the tank body 2-2 and between the horizontal scraping plate 2-11-4 and the bottom surface of the tank body 2-2 are 3-5 mm. The mud scraping plates 2-11-3 are arranged to scrape mud on the inclined surface and the horizontal surface at the same time, and the distance is set so that the mud scraping plates cannot be jammed in the mud scraping process and cannot accumulate too much sediment.

Further, honeycomb packing inclined pipes are arranged in the packing areas 2-5. The arrangement of the honeycomb packing inclined tube ensures that the treatment effect is good.

Further, the mixing and stirring area 2-3 is provided with a stirring cylinder 7 and a guide cylinder 8, the guide cylinder 8 is vertically arranged in the middle of the pool body 2-2, the top end of the guide cylinder 8 is fixedly connected with the top surface of the pool body 2-2, the stirring cylinder 7 is coaxially arranged in the guide cylinder 8, the stirring cylinder 7 and the guide cylinder 8 are connected through a plurality of groups of fixing plates 9, the bottom of the stirring cylinder 7 is of an inverted cone structure, the bottom of the stirring cylinder 7 is provided with a valve 6-4, and the edge of the top surface of the stirring cylinder 7 is provided with an arc-shaped plate 7-1. A certain space is reserved between the top surface of the mixing drum 7 and the top wall of the tank body 2-2 for overflow, a plurality of groups of fixing plates 9 are uniformly distributed on the side wall of the mixing drum 7, and gaps are reserved among the fixing plates 9, so that the liquid cannot fall off even if the mixing drum 7 is fixed. Setting of valve 6-4: after the operation is finished, a small part of sediment falls on the bottom surface of the stirring cylinder 7, the falling of the sediment is convenient due to the arrangement of the inverted cone-shaped structure, and the falling of the sediment is controlled by the valve 6-4, so that the condition that the subsequent operation is influenced due to the fact that the sediment cannot be processed is avoided. The provision of the arcuate plate 7-1 assists the overflow action of the liquid.

Further, the stirring device 2-10 comprises a stirring driving motor 2-10-1, a stirring shaft 2-10-2 and a plurality of groups of stirring blades 2-10-3, the stirring driving motor 2-10-1 is vertically arranged on the top surface of the tank body 2-2 downwards, the stirring shaft 2-10-2 is vertically arranged in the stirring cylinder 7, the top end of the stirring shaft 2-10-2 penetrates through the top surface of the tank body 2-2 and then is coaxially and fixedly connected with an output shaft of a stirring driving motor 2-10-1, a plurality of groups of stirring blades 2-10-3 are uniformly distributed on the side wall of the stirring shaft 2-10-2, the stirring driving motor 2-10-1 drives the stirring shaft 2-10-2 and the stirring blade 2-10-3 to rotate. The stirring paddles are also provided with multiple layers 2-10-3, each layer is not provided with multiple groups, the upper part and the lower part in the stirring cylinder 7 can be fully stirred, and the mixing efficiency is improved. The clarification effect is improved, and mud scraping is performed at intervals, so that the subsequent clarification effect cannot be influenced due to overlong time.

Further, the water inlet pipe 2-8 comprises a first water inlet pipe 2-8-1 and a second water inlet pipe 2-8-2, the second water inlet pipe 2-8-2 is of a half circular arc circular pipe structure, the second water inlet pipe 2-8-2 is arranged on the side wall of the stirring drum 7, water gaps 2-8-3 are uniformly distributed on the bottom surface of the second water inlet pipe 2-8-2, one end of the first water inlet pipe 2-8-1 is connected with the water inlet 2-2-3, and the other end of the first water inlet pipe 2-8-1 penetrates through the side wall of the guide drum 8 and the stirring drum 7 to be communicated with the second water inlet pipe 2-8-2;

the oxalic acid inlet pipe 2-9 comprises a first oxalic acid inlet pipe 2-9-1 and a second oxalic acid inlet pipe 2-9-2, the second oxalic acid inlet pipe 2-9-2 is of a half circular arc circular pipe structure, the second oxalic acid inlet pipe 2-9-2 and a second water inlet pipe 2-8-2 are oppositely arranged, the second oxalic acid inlet pipe 2-9-2 is arranged on the side wall of the stirring cylinder 7, oxalic acid ports 2-9-3 are uniformly distributed on the bottom surface of the second oxalic acid inlet pipe 2-9-2, one end of the first oxalic acid inlet pipe 2-9-1 is connected with the oxalic acid inlet port 2-2-4, and the other end of the first oxalic acid inlet pipe 2-9-1 penetrates through the guide cylinder 8 and the side wall of the stirring cylinder 7 to be communicated with the second oxalic acid inlet pipe 2-9-2. The second water inlet pipe 2-8-2 and the second oxalic acid inlet pipe 2-9-2 are both half circular arc circular pipe structures and are oppositely arranged, so that the mixing area of water and oxalic acid flowing into the mixing drum 7 is larger, and the mixing effect is better.

Claims (10)

1. The utility model provides an utilize water making device of evaporation secondary condensate in aluminium oxide production which characterized in that: comprises a heat exchange device (1), a mechanical stirring clarification tank (2), a quartz sand filter (3), an anion-cation bed ion exchanger (4) and a mixed bed ion exchanger (5);

the evaporation secondary condensate (6) is connected with a heat exchange device (1) through a connecting pipe, the heat exchange device (1) is connected with a mechanical stirring clarification tank (2) through a connecting pipe, the mechanical stirring clarification tank (2) is connected with a quartz sand filter (3) through a connecting pipe, the quartz sand filter (3) is connected with a cation-anion bed ion exchanger (4) through a connecting pipe, and the anion-cation bed ion exchanger (4) is connected with a mixed bed ion exchanger (5) through a connecting pipe;

the mechanical stirring clarification tank (2) comprises a support (2-1) and a tank body (2-2) arranged on the top surface of the support (2-1), wherein a mixing and stirring area (2-3) is arranged at the upper part of the middle in the tank body (2-2), and a sedimentation area (2-4), a filler area (2-5) and a clarification area (2-6) are sequentially arranged in the inner cavity of the tank body (2-2) outside the mixing and stirring area (2-3) from bottom to top; an overflow groove (2-7) is arranged in the clarification area (2-6), the bottom surface of the overflow groove (2-7) is inclined, a water outlet (2-2-1) is arranged on the side wall of the tank body (2-2) opposite to the lowest position of the bottom surface of the overflow groove (2-7), and a sludge outlet (2-2-2) is arranged on the bottom surface of the tank body (2-2);

the side wall of the tank body (2-2) below the filling area (2-5) is provided with a water inlet (2-2-3) and an oxalic acid inlet (2-2-4), the water inlet (2-2-3) is communicated with the mixing and stirring area (2-3) through a water inlet pipe (2-8), the oxalic acid inlet (2-2-4) is communicated with the mixing and stirring area (2-3) through an oxalic acid inlet pipe (2-9), a stirring device (2-10) is arranged in the mixing and stirring area (2-3), and a mud scraping device (2-11) is arranged in the settling area (2-4).

2. The water making device using the evaporated secondary condensate in the alumina production according to claim 1, characterized in that: a first flow regulating valve (6-1) is arranged on a connecting pipe between the heat exchange device (1) and the mechanical stirring clarification tank (2), a second flow regulating valve (6-2) is arranged on the oxalic acid inlet pipe (2-9), and a sludge discharge valve (6-3) is arranged at the sludge outlet (2-2-2).

3. The water making device for evaporating secondary condensate in the production of alumina according to claim 1, is characterized in that: the heat exchange device (1) is a plate heat exchanger.

4. The water making device for evaporating secondary condensate in the production of alumina according to claim 1, is characterized in that: the bottom of the tank body (2-2) is of an inverted cone structure.

5. The water making device for evaporating secondary condensate in the production of alumina according to claim 4, is characterized in that: the mud scraping device (2-11) comprises a mud scraping driving motor (2-11-1), a mud scraping shaft (2-11-2) and a plurality of groups of mud scraping plates (2-11-3), the mud scraping driving motor (2-11-1) is vertically arranged at the middle part below the tank body (2-2) upwards, the mud scraping shaft (2-11-2) is vertically arranged at the bottom in the tank body (2-2), the bottom end of the mud scraping shaft (2-11-2) penetrates through the bottom wall of the tank body (2-2) and then is coaxially and fixedly connected with an output shaft of the mud scraping driving motor (2-11-1), the mud scraping plates (2-11-3) are uniformly arranged on the side wall of the mud scraping shaft (2-11-2), and the mud scraping driving motor (2-11-1) drives the mud scraping shaft (2-11-2) and the mud scraping plates (2-11-3) And (4) rotating.

6. The water making device for evaporating secondary condensate in the production of alumina according to claim 5, is characterized in that: the mud scraping plate (2-11-3) comprises a horizontal scraping plate (2-11-4) and an inclined scraping plate (2-11-5) arranged at one end of the horizontal scraping plate (2-11-4), and the distances between the inclined scraping plate (2-11-5) and the side wall of the bottom of the tank body (2-2) and between the horizontal scraping plate (2-11-4) and the bottom surface of the tank body (2-2) are 3-5 mm.

7. The water making device for evaporating secondary condensate in the production of alumina according to claim 1, is characterized in that: and a honeycomb packing inclined tube is arranged in the packing area (2-5).

8. The water making device for evaporating secondary condensate in the production of alumina according to claim 1, is characterized in that: the mixing and stirring area (2-3) is provided with a stirring cylinder (7) and a guide cylinder (8), the guide cylinder (8) is vertically arranged in the middle of the pool body (2-2) and fixedly connected with the top end of the guide cylinder (8) and the top surface of the pool body (2-2), the stirring cylinder (7) is coaxially arranged in the guide cylinder (8), the stirring cylinder (7) and the guide cylinder (8) are connected through a plurality of groups of fixing plates (9), the bottom of the stirring cylinder (7) is of an inverted cone structure, the bottom of the stirring cylinder (7) is provided with a valve (6-4), and the top surface edge of the stirring cylinder (7) is provided with an arc-shaped plate (7-1).

9. The water making device for evaporating secondary condensate in the production of alumina according to claim 8, is characterized in that: the stirring device (2-10) comprises a stirring driving motor (2-10-1), a stirring shaft (2-10-2) and a plurality of groups of stirring blades (2-10-3), the stirring driving motor (2-10-1) is vertically arranged on the top surface of the tank body (2-2) downwards, the stirring shaft (2-10-2) is vertically arranged in a stirring barrel (7), the top end of the stirring shaft (2-10-2) penetrates through the top surface of the tank body (2-2) and then is coaxially and fixedly connected with an output shaft of the stirring driving motor (2-10-1), the stirring blades (2-10-3) are uniformly distributed on the side wall of the stirring shaft (2-10-2), and the stirring driving motor (2-10-1) drives the stirring shaft (2-10-2) and the stirring blades (2-10-3) to rotate .

10. The water making device for evaporating secondary condensate in the production of alumina according to claim 9, is characterized in that: the water inlet pipe (2-8) comprises a first water inlet pipe (2-8-1) and a second water inlet pipe (2-8-2), the second water inlet pipe (2-8-2) is of a half circular arc circular pipe structure, the second water inlet pipe (2-8-2) is arranged on the side wall of the mixing drum (7), water gaps (2-8-3) are uniformly distributed on the bottom surface of the second water inlet pipe (2-8-2), one end of the first water inlet pipe (2-8-1) is connected with the water inlet (2-2-3), and the other end of the first water inlet pipe penetrates through the side wall of the guide drum (8) and the mixing drum (7) and is communicated with the second water inlet pipe (2-8-2);

the oxalic acid inlet pipe (2-9) comprises a first oxalic acid inlet pipe (2-9-1) and a second oxalic acid inlet pipe (2-9-2), the second oxalic acid inlet pipe (2-9-2) is of a half circular arc circular pipe structure, the second oxalic acid inlet pipe (2-9-2) and the second water inlet pipe (2-8-2) are oppositely arranged, the second oxalic acid inlet pipe (2-9-2) is arranged on the side wall of the mixing drum (7), oxalic acid ports (2-9-3) are uniformly distributed on the bottom surface of the second oxalic acid inlet pipe (2-9-2), one end of the first oxalic acid inlet pipe (2-9-1) is connected with the oxalic acid inlet (2-2-4), and the other end of the first oxalic acid inlet pipe passes through the side wall of the guide cylinder (8) and the stirring cylinder (7) and is communicated with the second oxalic acid inlet pipe (2-9-2).

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