Slurry suction filtration device in aluminum oxide production process

Abstract

The utility model discloses a suction filtration funnel and a suction filtration device. The suction filtration funnel comprises a suction filtration box body, a plurality of suction filtration funnels and an indicator liquid adding device, a hot water pipeline capable of providing hot water for each suction filtration funnel is mounted above the suction filtration funnel; the lower end of each suction filtration funnel is hermetically communicated with the suction filtration box body; the indicator liquid adding device is mounted at the upper end of each suction filtration funnel; the suction filtration box body is connected with a vacuum pump; a liquid discharge pipe is arranged at the lower part of the suction filtration box body. The flushing end point can be accurately judged, excessive cleaning can be avoided, the use amount of hot water is reduced, meanwhile, the situation that flushing is stopped when flushing does not meet the requirement can be avoided, and practicability is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of devices for analyzing and detecting aluminum oxide, and in particular relates to a slurry filtration device in an aluminum oxide production process. Background Art

[0002] During the alumina production process, it is necessary to analyze and test the alumina process slurry, such as testing the physical properties of the slurry such as liquid-to-solid ratio, solid content, fineness, suspended solids and specific gravity, as well as chemical components such as total alkali, alumina, caustic soda, sodium carbonate, silica, iron oxide, and sulfate, in order to correctly manage the production of alumina. At present, the first step in analyzing and testing the alumina process slurry is to separate the alumina slurry into solids and liquids. The current method is to use a Buchner funnel as a suction filtration device to perform suction filtration under vacuum conditions. During the suction filtration process, the slurry is rinsed with hot water. After rinsing, the solids are collected for drying and weighing. During the suction filtration process, the slurry needs to be rinsed with hot water for a long time to rinse the soluble substances in the slurry. At present, there is no other auxiliary method to determine whether the slurry is rinsed clean, and it is impossible to determine the end point of the rinse, resulting in a large amount of hot water resources Waste, so it is particularly necessary to improve the existing alumina production process slurry suction filtration device. Utility Model Content

[0003] The purpose of the utility model is to overcome the problem that the suction filtration device used in the prior art cannot judge whether the hot water is rinsed clean or the flushing end point when separating the solid-liquid of the slurry in the aluminum oxide production process, resulting in a large amount of hot water usage and a waste of water resources, and to provide a slurry suction filtration device for the aluminum oxide production process.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] A slurry filtration device for an alumina production process comprises a filtration box, a plurality of filtration funnels and an indicator liquid charger; a hot water pipe capable of providing hot water to each filtration funnel is installed above each filtration funnel; the lower end of each filtration funnel is sealed and connected to the filtration box; the indicator liquid charger is installed at the upper end of each filtration funnel; the filtration box is connected to a vacuum pump; and a drain pipe is provided at the lower part of the filtration box.

[0006] Furthermore, the indicator liquid adder is an automatic liquid adder; the automatic liquid adder is provided with a liquid adding solenoid valve; a color sensor is also installed in each of the suction filtration funnels, for detecting the color of the liquid in the suction filtration funnel and generating a color value; a controller is also provided on the suction filtration box; the color sensor signal output line on each of the suction filtration funnels is connected to the controller; the liquid adding solenoid valve is connected to the controller; the controller can control the automatic liquid adder to add the indicator drop by drop at intervals during the filtration process and control the automatic liquid adder to close.

[0007] Furthermore, a liquid inlet solenoid valve is installed at the pipe mouth of each hot water pipe; each of the liquid inlet solenoid valves is connected to the controller; and the controller can control the opening and closing of each of the liquid inlet solenoid valves.

[0008] Furthermore, the indicator liquid charger contains an indicator.

[0009] Furthermore, a liquid level sensor is installed in the filtration box; the liquid level sensor can detect the liquid level in the filtration box; a drain solenoid valve is installed on the drain pipe; the drain solenoid valve is connected to the controller; the signal output line of the liquid level sensor is connected to the controller; the controller can control the opening and closing of the drain solenoid valve.

[0010] Furthermore, a liquid outlet solenoid valve is respectively arranged between each of the suction funnels and the box body; the liquid outlet solenoid valve is connected to the controller; the controller can control the opening and closing of the liquid inlet solenoid valve, the liquid adding solenoid valve and the liquid outlet solenoid valve corresponding to each suction funnel in a linkage manner.

[0011] Furthermore, the indicator is a phenolphthalein indicator or a methyl orange indicator.

[0012] Furthermore, the suction filtration funnel includes a shell and a sieve plate; the sieve plate is embedded in the shell. The suction filtration funnel can also be a Buchner funnel in the prior art, and of course, a funnel made of stainless steel and having the same structure as the Buchner funnel can also be used.

[0013] Furthermore, the hot water pipe is connected to a hot water supply device.

[0014] Compared with the prior art, the utility model has the following effects:

[0015] (1) The utility model sets an indicator liquid adder in each suction funnel, which can drip the indicator during the suction process. By observing the change in the color of the liquid in the suction funnel, it can be judged whether the slurry in the alumina production process has been flushed to the requirements. The utility model can intuitively judge the flushing end point, avoid excessive cleaning, reduce the use of hot water, and also avoid stopping flushing before the flushing meets the requirements. The utility model is highly practical.

[0016] (2) The utility model also sets a color sensor, which cooperates with the indicator liquid adder. The indicator liquid adder adds the indicator drop by drop into the filtration funnel at intervals during the filtration process. The color of the liquid in the filtration funnel is judged by the color sensor. When the color reaches the standard, the flushing meets the requirements. At this time, the color sensor transmits a signal to the controller to control the liquid inlet solenoid valve and the liquid adding solenoid valve to close in sequence at a certain time interval to complete the flushing. The utility model can automatically judge whether the slurry flushing in the alumina production process meets the requirements, and can accurately judge the flushing end point, which is highly practical.

[0017] (3) In the prior art, during the flushing process of the alumina process slurry, manual flushing is required, and each step is manually operated one by one. In this way, one person is required to operate a suction funnel. When multiple sample liquids need to be flushed, one needs to wait for the flushing of one sample liquid to be completed before the next sample liquid can be flushed, which takes a long time. If several sample liquids are flushed at the same time, a lot of manpower is required. However, the utility model can be provided with multiple suction funnels, and multiple sample liquids can be flushed at the same time, which is highly efficient. In addition, the utility model sets a controller, and sets a solenoid valve on the hot water pipe corresponding to each suction funnel and the lower end of each suction funnel. By setting an indicator liquid adder on each suction funnel to drip an indicator, the flushing condition is detected by a color sensor, thereby controlling the closing of each solenoid valve. The utility model also sets a liquid level sensor in the suction box, and the liquid level sensor is connected to the controller. When the liquid level sensor detects that the water level reaches the set maximum, the liquid discharge solenoid valve of the liquid discharge pipe is controlled to drain the water. The utility model has a high degree of automation and does not require a large amount of manual operation. Only one person is required to operate and flush multiple sample liquids, which is highly efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a slurry filtration device in an alumina production process according to the utility model;

[0019] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0020] Figure 3 This is a working diagram of the liquid level sensor, color sensor, controller and solenoid valves in the utility model; Figure 3In the figure, color sensor Ⅰ is the color sensor in the filtration funnel Ⅰ, and the liquid inlet solenoid valve Ⅰ, the liquid adding solenoid valve Ⅰ and the liquid outlet solenoid valve Ⅰ are the three solenoid valves corresponding to the filtration funnel Ⅰ; color sensor Ⅱ is the color sensor in the filtration funnel Ⅱ, and the liquid inlet solenoid valve Ⅱ, the liquid adding solenoid valve Ⅱ and the liquid outlet solenoid valve Ⅱ are the three solenoid valves corresponding to the filtration funnel Ⅱ; color sensor Ⅲ is the color sensor in the filtration funnel Ⅲ, and the liquid inlet solenoid valve Ⅲ, the liquid adding solenoid valve Ⅲ and the liquid outlet solenoid valve Ⅲ are the three solenoid valves corresponding to the filtration funnel Ⅲ; color sensor Ⅳ is the color sensor in the filtration funnel Ⅳ, and the liquid inlet solenoid valve Ⅳ, the liquid adding solenoid valve Ⅳ and the liquid outlet solenoid valve Ⅳ are the three solenoid valves corresponding to the filtration funnel Ⅳ;

[0021] In the figure, 1-filtration box, 2-filtration funnel, 21-filtration funnel I, 22-filtration funnel II, 23-filtration funnel III, 24-filtration funnel IV, 3-automatic liquid adder, 4-hot water pipe, 5-liquid inlet solenoid valve, 6-color sensor, 7-controller, 8-liquid adding solenoid valve, 9-liquid discharge pipe, 10-liquid level sensor, 11-liquid discharge solenoid valve, 12-liquid outlet solenoid valve, 13-vacuum pump connecting pipe. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] See also Figure 1-Figure 3 As shown, the utility model provides a slurry filtration device for an aluminum oxide production process, comprising a filtration box 1, a plurality of filtration funnels 2 and an indicator liquid adder; a hot water pipe 4 capable of providing hot water thereto is installed above each filtration funnel 2; the lower end of each filtration funnel 2 is sealed and connected to the filtration box 1; an indicator liquid adder is installed at the upper end of each filtration funnel 2; the filtration box 1 is connected to a vacuum pump; and a drain pipe 9 is provided at the lower part of the filtration box 1. In this embodiment, an indicator is installed in the indicator liquid adder, and during the slurry filtration process of the aluminum oxide production process, an indicator, such as a phenolphthalein indicator, can be dripped into the filtration funnel 2 through the indicator liquid adder. When the aluminum oxide process slurry is rinsed clean, the water is neutral, and the phenolphthalein indicator changes from red to colorless. The rinsing end point can be judged by observing the change in the color of the liquid, which can avoid the situation of unclean rinsing and excessive cleaning.

[0024] In a preferred embodiment, the indicator liquid adder is an automatic liquid adder 3; the automatic liquid adder 3 is provided with a liquid adding solenoid valve 8; a color sensor 6 is also installed in each suction filtration funnel 2, which is used to detect the color of the liquid in the suction filtration funnel 2 and generate a color value; a controller 7 is also provided on the suction filtration box 1; the signal output line of the color sensor 6 on each suction filtration funnel 2 is connected to the controller 7; the liquid adding solenoid valve 8 is connected to the controller 7; the controller 7 can control the automatic liquid adder 3 to add the indicator drop by drop at intervals during the filtration process and control the automatic liquid adder 3 to be closed. Specifically, during the filtration process, the controller 7 can control the automatic liquid adder 3 to add the indicator drop by drop, and when the color sensor 6 detects that the color in the suction filtration funnel changes to the set value, the signal is transmitted to the controller 7 to control the automatic liquid adder 3 to be closed. It can close the automatic liquid adder 3 without manual operation, and the operation is simpler.

[0025] Of course, an alarm can also be set on each suction filtration funnel 2, and the alarm is connected to the controller 7. When the color sensor 6 detects that the color in the suction filtration funnel changes to a set value, the signal is transmitted to the controller 7 to control the alarm to sound an alarm, prompting the flushing. It is unnecessary for the staff to observe the color change of the liquid in the suction filtration funnel 2 in real time, which greatly reduces the workload of the staff.

[0026] In a more preferred solution based on the above embodiment, each hot water pipe 4 is equipped with a liquid inlet solenoid valve 5; each liquid inlet solenoid valve 5 is connected to a controller 7; and the controller 7 can control each liquid inlet solenoid valve 5 to open and close. During filtration, the controller 7 can control the liquid inlet solenoid valve 5 and the liquid adding solenoid valve 8 corresponding to each filtration funnel 2 to open successively at a certain interval. When the color sensor 6 detects that the color value reaches the set value, the signal is transmitted to the controller 7 to control the liquid inlet solenoid valve 5 and the liquid adding solenoid valve 8 to close at the same time. It is unnecessary to manually close the valve on the hot water pipe 4, nor is it necessary to manually close the liquid adding solenoid valve 8 on the automatic liquid adding device 3, which can reduce the workload of the staff and has strong practicality.

[0027] Preferably, in this embodiment, the filtration funnel 2 includes a shell and a sieve plate; the sieve plate is embedded in the shell.

[0028] In this embodiment, see Figure 1As shown, this embodiment includes four suction funnels 2, namely, suction funnel I 21, suction funnel II 21, suction funnel III 23, and suction funnel IV 24. Of course, in other embodiments, the number of suction funnels 2 can be increased or decreased according to actual needs. A liquid inlet solenoid valve I is installed on the hot water pipe 4 corresponding to the suction funnel I 21, and the automatic liquid adder 3 on the suction funnel I 2 is also provided with a liquid adding solenoid valve I. The color sensor 6 on the suction funnel I 21 can transmit a signal to the controller 7 to control the liquid inlet solenoid valve I and the liquid adding solenoid valve I to close and open. Similarly, the suction funnel II 21, the suction funnel III 23, and the suction funnel IV 24 can respectively detect the color of the liquid in the suction funnel 2 through the color sensor 6 in the suction funnel 2 and transmit the signal to the controller 7 to respectively control the corresponding liquid inlet solenoid valve 5 and the liquid adding solenoid valve 8 to open and close (that is, the liquid inlet solenoid valve 5 and the liquid adding solenoid valve 8 corresponding to each suction funnel 2 are controlled in a linkage manner). See the specific work flow diagram. Figure 3 As shown. During the filtration, the controller 7 first opens the liquid inlet solenoid valve 5, first opens the hot water pipe 4, and rinses the alumina process slurry. After rinsing for 1 minute (of course, the interval between the opening of the liquid inlet solenoid valve 5 and the liquid adding solenoid valve 8 can be changed according to the actual flushing amount, the concentration of the alumina process slurry, etc., which can reduce the amount of indicator used. Of course, setting the liquid inlet solenoid valve 5 and the liquid adding solenoid valve 8 to be opened at the same time does not affect the judgment of the flushing end point), the controller 7 automatically controls the corresponding liquid adding solenoid valve 8 to open, and the automatic liquid adder 3 can add the indicator drop by drop during the filtration process after the liquid adding solenoid valve 8 is opened. In this embodiment, the flushed alumina production process slurry is alkaline, and the indicator selected is phenolphthalein indicator. When the slurry is rinsed clean, when the liquid in the filtration funnel 2 is neutral, the color of the liquid changes from red to colorless. At this time, the color sensor 6 can detect that the color of the liquid changes to the set value, and transmits it to the controller 7 to control the liquid inlet solenoid valve 5 and the liquid adding solenoid valve 8 to be closed at the same time, and the filtration is continued for a certain period of time until the liquid in the filtration funnel is filtered clean and the filtration is completed.

[0029] In order to improve the filtration effect of the filtration equipment, ensure the vacuum effect of the filtration box 1, and avoid mutual influence between the filtration funnels 2. Preferably, in this embodiment, a liquid outlet solenoid valve 12 is arranged between each filtration funnel 2 and the box; the liquid outlet solenoid valve 12 is connected to the controller 7; the controller 7 can control the opening and closing of the liquid inlet solenoid valve 5, the liquid adding solenoid valve 8 and the liquid outlet solenoid valve 12 corresponding to each filtration funnel 2 in a linkage manner. Specifically, when the filtration and flushing starts, the controller 7 simultaneously opens the liquid inlet solenoid valve 5 and the liquid outlet solenoid valve 12 corresponding to the filtration funnel 2 for hot water flushing and filtration. After flushing for a period of time and reaching the set value, the controller 7 automatically controls the liquid adding solenoid valve 8 to open, and the automatic liquid adder 3 drips the indicator. When the color sensor 6 can detect that the color of the liquid changes from red to anhydrous (that is, the filtration is clean) and transmits it to the controller 7, the controller 7 can control the liquid inlet solenoid valve 5 and the liquid adding solenoid valve 8 corresponding to the filtration funnel 2 to be closed first, and after a certain period of time (when the color sensor 6 detects that the liquid color changes, it is flushed clean at this time, but the liquid in the filtration funnel 2 is not filtered clean, so a certain period of time, such as 30 seconds, is required to ensure that the liquid outlet solenoid valve 12 can be closed only after the filtration is clean. The interval time can be set by the controller 7) to control the liquid outlet solenoid valve 12 to be closed to avoid the filtration funnel 2 that has completed the filtration from being connected to the filtration box 1, affecting the vacuum filtration effect of other filtration funnels 2.

[0030] Preferably, in this embodiment, a liquid level sensor 10 is installed in the suction filtration box 1; a drainage solenoid valve 11 is installed on the drainage pipe 9, and the drainage solenoid valve 11 is connected to the controller 7; the signal output line of the liquid level sensor 10 is connected to the controller 7; the liquid level sensor 10 can detect the liquid level in the suction filtration box 1, and when the liquid level reaches the high limit, the liquid level sensor 10 can transmit a signal to the controller 7 to control the drainage solenoid valve 11 to open and realize automatic drainage, and when the liquid level in the box drops to a specified height, the liquid level sensor 10 can transmit a signal to the controller 7 to control the drainage solenoid valve 11 to close. The specific control process is shown in Figure 3 In this embodiment, the drain solenoid valve 11 can be opened to drain the liquid according to the situation in the filtration box 1, and the filtration box 1 does not need to be opened all the time, which can effectively avoid the drain pipe 9 from affecting the vacuum effect. At the same time, manual operation is not required, and the degree of automation is high. Of course, in other embodiments with relatively low automation, the drain solenoid valve 11 and the liquid outlet solenoid valve 12 can be ordinary manual valves, and it is also possible not to use the controller 11 for control.

[0031] In this embodiment, the single chip microcomputer of the controller 7 uses the model STC89C516RD, the color sensor 6 uses the model TCS230, the liquid level sensor uses the electrode liquid level sensor, and the specific model is also HNZ-DYQ-1. Of course, other controller models, color sensor models and liquid level sensor models that can implement the technical solution of the utility model are also acceptable.

[0032] In this embodiment, the indicator selected is phenolphthalein indicator. Of course, other suitable indicators, such as methyl orange indicator, may also be selected according to the properties of the flushing slurry.

[0033] The use principle and use process of the new type of use are as follows: turn on the power switch of the vacuum pump, put the filter paper into the suction funnel 2 according to the operating standard, and then pour the alumina process slurry into it. The controller opens the liquid inlet solenoid valve 5 and the liquid outlet solenoid valve 12 corresponding to the suction funnel 2, and the hot water pipe 4 flushes hot water into the suction funnel to perform hot water flushing and filtering on the alumina process slurry in the suction funnel 2. After the flushing reaches the set time, the controller 7 automatically controls the liquid adding solenoid valve 8 to open. At this time, the automatic liquid adder 3 adds the indicator drop by drop. When the color sensor 6 in the suction funnel 2 detects a color change, the signal is transmitted to the controller 7 to control the liquid inlet solenoid valve 5 and the liquid adding solenoid valve 8 to close at the same time first, and the liquid outlet solenoid valve 12 is closed again after the set time interval, and the filtration is completed, and the vacuum pump power switch is turned off. During the filtration process, when the liquid level sensor detects that the liquid level in the filtration box 1 reaches the high limit, the liquid level sensor 10 can transmit a signal to the controller 7 to control the drain solenoid valve 11 to open and realize automatic drainage. When the liquid level sensor detects that the liquid level in the filtration box 1 drops to a specified height, the liquid level sensor 10 can transmit a signal to the controller 7 to control the drain solenoid valve 11 to close. The utility model can determine the flushing end point according to the color sensor 6, and can accurately determine whether the alumina process slurry is flushed sufficiently, avoiding the situation of incomplete flushing or excessive flushing that wastes water resources. The utility model can also greatly reduce the manual operation steps, does not need to rely on a large amount of manual operation, has a high level of automation, high efficiency, and strong practicality.

[0034] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some modifications and improvements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the definition of the claims.

Claims

1. A slurry filtration device for an alumina production process, characterized in that: The invention comprises a suction filtration box (1), a plurality of suction filtration funnels (2) and an indicator liquid adder; a hot water pipe (4) capable of supplying hot water to each suction filtration funnel (2) is installed above the suction filtration funnel; the lower end of each suction filtration funnel (2) is sealed and connected to the suction filtration box (1); the upper end of each suction filtration funnel (2) is installed with the indicator liquid adder; the suction filtration box (1) is connected to a vacuum pump; and a liquid discharge pipe (9) is arranged at the lower part of the suction filtration box (1).

2. The slurry filtration device for alumina production process according to claim 1, characterized in that: The indicator liquid adder is an automatic liquid adder (3); the automatic liquid adder (3) is provided with a liquid adding solenoid valve (8); each of the suction filtration funnels (2) is also equipped with a color sensor (6) for detecting the color of the liquid in the suction filtration funnel (2) and generating a color value; the suction filtration box (1) is also provided with a controller (7); the signal output line of the color sensor (6) on each of the suction filtration funnels (2) is connected to the controller (7); the liquid adding solenoid valve (8) is connected to the controller (7); the controller (7) is capable of controlling the automatic liquid adder (3) to add the indicator dropwise at intervals during the suction filtration process and controlling the automatic liquid adder (3) to be closed.

3. The slurry filtration device for alumina production process according to claim 2, characterized in that: A liquid inlet solenoid valve (5) is installed at the pipe mouth of each hot water pipe (4); each liquid inlet solenoid valve (5) is connected to the controller (7); and the controller (7) is capable of controlling each liquid inlet solenoid valve (5) to open and close.

4. The slurry filtration device for alumina production process according to claim 2, characterized in that: The automatic liquid adder (3) is filled with an indicator.

5. The slurry filtration device for alumina production process according to claim 2, characterized in that: A liquid level sensor (10) is installed in the suction filtration box (1); the liquid level sensor (10) is capable of detecting the liquid level in the suction filtration box (1); a liquid discharge solenoid valve (11) is installed on the liquid discharge pipe (9); the liquid discharge solenoid valve (11) is connected to the controller (7); a signal output line of the liquid level sensor (10) is connected to the controller (7); and the controller (7) is capable of controlling the opening and closing of the liquid discharge solenoid valve (11).

6. The slurry filtration device for alumina production process according to claim 3, characterized in that: A liquid outlet solenoid valve (12) is provided between each of the suction filtration funnels (2) and the box body; the liquid outlet solenoid valve (12) is connected to the controller (7); the controller (7) is capable of controlling the opening and closing of the liquid inlet solenoid valve (5), the liquid adding solenoid valve (8) and the liquid outlet solenoid valve (12) corresponding to each of the suction filtration funnels (2) in a linked manner.

7. The slurry filtration device for alumina production process according to claim 4, characterized in that: The indicator is a phenolphthalein indicator or a methyl orange indicator.

8. The slurry filtration device for alumina production process according to claim 1, characterized in that: The suction filtration funnel (2) comprises a shell and a sieve plate; the sieve plate is embedded in the shell.

9. The slurry filtration device for alumina production process according to claim 1, characterized in that: The hot water pipe (4) is connected to a hot water supply device.

Images