CN115784482A - A method for oxygen pressure treatment of waste liquid containing sodium polysulfide - Google Patents

Abstract

The invention discloses a method for treating waste liquid containing sodium polysulfide by oxygen pressure, relates to the field of waste water treatment containing sulfur, solves the problems of high resource consumption and serious pollution during the treatment of waste liquid containing sodium polysulfide in the prior art, and comprises the following steps: S1, put the waste liquid containing sodium polysulfide in a pressurized kettle, control the temperature at 120-200°C, oxygen partial pressure 1-2MPa, the color of the solution changes from dark brown to colorless and the reaction ends; S2, filter to obtain yellow sulfur powder and filtrate; S3, passing the above-mentioned filtrate into ozone for oxidation; S4, concentrating and crystallizing the oxidized filtrate to obtain sodium sulfate solid, this oxygen pressure treatment method containing sodium polysulfide waste liquid adopts oxygen pressure treatment to contain polysulfide waste Liquid, will not produce hydrogen sulfide gas, there is no risk of leakage of toxic and harmful gases, no exhaust gas absorption device is required, and the maximum utilization of resources is realized, which has a very high economic effect.

Description

A method for oxygen pressure treatment of waste liquid containing sodium polysulfide

technical field

The invention relates to the technical field of sulfur-containing wastewater treatment, in particular to a method for treating waste liquid containing sodium polysulfide with oxygen pressure.

Background technique

In the metallurgical industry, the sodium-alkali method is commonly used to treat sulfide ore or anode slime to remove elemental sulfur and enrich valuable metals. The process is simple and the process is short, but the waste liquid containing sodium polysulfide produced is extremely difficult to treat, thus hindering the large-scale use of the process. The waste liquid containing sodium polysulfide has high sulfur content, strong alkalinity, and strong odor. If it is directly discharged into the water body without treatment, it will lead to deterioration of the water body and cause environmental pollution.

At present, the method of treating waste liquid containing sodium polysulfide mainly adopts the acidification method, that is, adding hydrochloric acid or sulfuric acid dropwise to the waste liquid to cause disproportionation reaction of sodium polysulfide to generate hydrogen sulfide gas and sulfur, and then absorb hydrogen sulfide gas with lye. This method has the following disadvantages: 1. The amount of hydrogen sulfide gas produced is extremely large, and there is a risk of leakage; 2. The consumption of alkali is large, and additional equipment is required to process waste lye; 3. The amount of wastewater treatment is increased, and this method is used to treat 1 cubic meter The waste liquid containing sodium polysulfide will generate an additional 2 cubic meters of waste water. Therefore, we propose a method for treating waste liquid containing sodium polysulfide with oxygen pressure.

Contents of the invention

The object of the present invention is to provide a method for oxygen pressure treatment of waste liquid containing sodium polysulfide, which is convenient for energy saving and environmental protection, so as to solve the problems raised in the above-mentioned background technology.

In order to achieve the above object, the present invention provides the following technical solutions: a method for oxygen pressure treatment of waste liquid containing sodium polysulfide, comprising the following steps:

S1. Put the waste liquid containing sodium polysulfide in a pressurized kettle, control the temperature at 120-200°C, and oxygen partial pressure at 1-2MPa. The color of the solution changes from dark brown to colorless. The sodium polysulfide content is 5-40%, the sulfur index is 2-4, and the pH is between 11-13. The sodium polysulfide waste liquid is mainly composed of sodium disulfide, sodium trisulfide, sodium tetrasulfide and sodium thiosulfate;

S2, filter, obtain yellow sulfur powder and filtrate;

S3, passing the above-mentioned filtrate into ozone for oxidation, no sodium sulfite exists in the filtrate after the ozone oxidation reaction is finished;

S4. Concentrating and crystallizing the oxidized filtrate to obtain solid sodium sulfate.

Preferably, it includes an autoclave barrel, a filtering device and a stirring and cleaning device. In the step S1 and the step S2, sodium polysulfide waste liquid is passed into the autoclave barrel, and the filtering device is started. The filter device continuously filters the waste liquid in the barrel of the autoclave, and at the same time drives the stirring and cleaning device to stir the waste liquid and clean the sulfur deposits on the surface of the filter device, so that the sulfur deposits enter the Continuous filter collection is carried out in the filter device.

Preferably, a detection device is included. In the step S1, while the filter device and the stirring and cleaning device are running, the detection device will continuously detect the color permeability of the waste liquid, and when it is detected that the solution becomes colorless It can be judged that the reaction is completed when the time is set, preventing people from controlling the reaction time only by setting the time and making inaccurate judgments.

Preferably, a barrel cover is provided on the barrel of the autoclave, a base is fixedly connected to the bottom of the barrel of the autoclave, and a plurality of supporting legs are fixedly connected to the base, and the filtering device includes a device plate, There are a plurality of communication grooves on the device plate, and a plug-in groove is opened inside the device plate, and a plug-in groove is provided in the plug-in groove for filtering and collecting the sodium polysulfide waste liquid in the barrel of the pressurized kettle. The collection device, the device tray is provided with a driving member for driving the device tray to continuously reciprocate up and down, and the communication groove is provided for removing the waste above the device tray when the device tray moves up. The liquid leads to the bottom of the device plate, and when the device plate moves down, the communication groove is blocked, so that the waste liquid can completely pass through the connection part of the collection device for filtration and collection, so that The waste liquid is continuously filtered to prevent the precipitate from being stirred and suspended in the waste liquid to affect the detection of the detection device.

Preferably, the detection device includes a plurality of light emitters fixedly installed in the barrel of the autoclave, a light receiver is fixedly connected to the inner wall of the barrel of the autoclave, and the light of the plurality of light emitters is uniform. It is directed to the light receiver, so that it is convenient to judge whether the waste liquid has reacted to a colorless state through the intensity of the light received by the light receiver.

Preferably, the collection device includes a collection box inserted into the socket, the top of the collection box is tapered, and a plurality of first connecting pipes are opened at the bottom of the device tray, and the collection box A plurality of second connecting pipes communicating with the first connecting pipes are provided at the bottom end of the first connecting pipe, the second connecting pipes communicate with the inside of the collecting box, and the top of the inner wall of the collecting box is fixedly connected with a filter net , the upper end of the filter screen is fixedly connected with a one-way valve, and a plurality of first extension springs are fixedly connected in the collection box, and the first extension spring is fixedly connected with a valve for blocking the second connecting pipe. As for the blocking ball, the device tray is provided with a push-out piece for pushing the collection box out of the socket, so as to facilitate the collection of the filtered sediment.

Preferably, the driving member includes a driving motor fixedly installed on the base, the output end of the driving motor is coaxially fixedly connected with a rotating rod, and the rotating rod passes through the bottom end of the barrel of the autoclave, And it is rotatably connected with the barrel of the pressurized kettle, the top end of the rotating rod is coaxially fixedly connected with a reciprocating screw rod threadedly connected with the device disk, and the inner wall of the barrel of the pressurized kettle is provided with a plurality of guide grooves, The device disk is fixedly connected with a plurality of guide blocks which are respectively slidably connected with the plurality of guide grooves, so as to drive the device disk to continuously reciprocate.

Preferably, the connecting member includes a plurality of blocks that are slidably connected to a plurality of the communication grooves, the sides of the communication grooves are provided with sliding grooves that are slidably connected to the stoppers, and the stoppers are provided with On the slope surface, a plurality of the stoppers are fixedly connected with the first springs fixedly connected with the chute, so that when the device disk moves up, the waste liquid above the device disk can be directed downward, and when the device disk moves down, Block communication slots to allow for adequate filtration of waste below the device tray.

Preferably, the push-out piece includes a plug-in block that is fixedly installed on the side of the collection box and plugged into the plug-in slot, and a device slot is opened on the device tray, and an elastic warp is rotatably connected in the device slot. The upper side of one end of the elastic warping rod is in conflict with the bottom surface of the insertion block, and the upper side of the other end is fixedly connected with a pressing block, so that the collection box can be taken out after the reaction is completed.

Preferably, the agitating and cleaning device includes a rotating ring that is rotatably connected to the top end of the device disk, the rotating ring is fixedly connected with a limit block, and the reciprocating screw rod is provided with a ring that is slidably connected with the limit block. Limiting slots, the rotating ring is provided with a drive to stir the waste liquid inside the barrel of the autoclave when the rotating ring rotates, and at the same time clean the upper surface of the collection box and the device tray The stirring and cleaning parts are convenient for stirring the waste liquid inside the autoclave barrel to accelerate the reaction, and at the same time, it can continuously remove the sediment accumulated on the surface of the collection box and the device plate.

Preferably, the agitating cleaning member includes a driving ring, on which a plurality of cleaning rods are fixedly connected to the upper surfaces of the collection box and the device tray, and on the driving ring are fixedly connected A plurality of stirring rods, the rotating ring is provided with a plurality of clamping grooves, the driving ring is fixedly connected with a plurality of clamping blocks which are clamped with the clamping grooves, and the rotating ring is threadedly connected with The fixing ring is convenient for the disassembly and assembly of the cleaning rod and the stirring rod, and can also limit the collection box.

Compared with prior art, the beneficial effect of the present invention is:

The present invention solves the problems of high resource consumption and serious pollution during the treatment of the existing sodium polysulfide waste liquid, and has the following beneficial effects: (1) The present invention uses oxygen pressure to treat the waste liquid containing sodium polysulfide without generating hydrogen sulfide gas , there is no risk of toxic and harmful gas leakage, and no tail gas absorption device is needed; (2) The S2 and S4 steps of the present invention obtain sulfur and sodium sulfate with recovery value respectively, realizing the maximum utilization of resources; (3) The present invention solves the problem of metallurgical The problem of difficult treatment of sodium-alkali desulfurization waste liquid in the industry is conducive to the large-scale use of sodium-alkali method in sulfide ore and anode slime wet desulfurization process, which has a very high economic effect; (4) through the installation of filtering devices and stirring cleaning devices And the detection device, it is convenient to continuously filter the waste liquid in the reactor, and at the same time, the detection device can accurately judge the end time of the reaction. After the reaction is completed, the filtration of the S2 step is also completed. The operation is simple and fast, and the work efficiency and reaction time are improved. the accuracy.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention;

Fig. 2 is a schematic diagram of the internal structure of the present invention;

Fig. 3 is a sectional view of the overall structure of the present invention;

Fig. 4 is the structural representation of filter device of the present invention;

Fig. 5 is an enlarged view of area A in Fig. 4;

Fig. 6 is a schematic structural view of the stirring and cleaning device of the present invention;

Figure 7 is an enlarged view of area B in Figure 6;

Figure 8 is an enlarged view of area C in Figure 6;

Fig. 9 is an exploded view of the filter device structure of the present invention;

Fig. 10 is a schematic diagram of the structure of the collection device of the present invention.

In the figure: 1-barrel body of the pressurized kettle; 2-barrel lid; 3-base; 4-supporting legs; 5-filter device; ; 10-socket slot; 11-collecting device; 12-driver; Connecting pipe; 19-filter; 20-one-way valve; 21-first extension spring; 22-blocking ball; 23-extrusion piece; 24-drive motor; Slot; 28-guide block; 29-block; 30-chute; 31-slope; 32-first spring; 33-socket block; 34-device slot; 37-rotating ring; 38-limiting block; 39-limiting groove; 40-stirring cleaning piece; 41-driving ring; 42-cleaning rod; 43-stirring rod; 46-fixing ring.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Example 1

Please refer to Fig. 1-Fig. 10, a kind of oxygen pressure treatment in illustration contains the method for sodium polysulfide waste liquid, comprises the following steps:

S1. Put the waste liquid containing sodium polysulfide in a pressurized kettle, control the temperature at 120-200°C, and oxygen partial pressure at 1-2MPa. The color of the solution changes from dark brown to colorless. The sodium polysulfide content is 5-40%, the sulfur index is 2-4, and the pH is between 11-13. The sodium polysulfide waste liquid is mainly composed of sodium disulfide, sodium trisulfide, sodium tetrasulfide and sodium thiosulfate;

S2, filter, obtain yellow sulfur powder and filtrate;

S3, passing the above-mentioned filtrate into ozone for oxidation, no sodium sulfite exists in the filtrate after the ozone oxidation reaction is finished;

S4. Concentrating and crystallizing the oxidized filtrate to obtain solid sodium sulfate.

Please refer to Fig. 1-Fig. 3, comprise autoclave barrel 1, filtering device 5 and agitation cleaning device 6 in the illustration, in described step S1 and described step S2, sodium polysulfide waste liquid is passed into described pressurization In the still barrel body 1, start the filter device 5, and the filter device 5 continuously filters the waste liquid in the pressurized still barrel body 1, and simultaneously drives the stirring and cleaning device 6 to stir and clean the waste liquid. The sulfur deposits on the surface of the filter device 5 are cleaned, so that the sulfur deposits enter the filter device 5 for continuous filtration and collection.

Please refer to Fig. 1-Fig. 3, the detection device 7 is included in the illustration, in the step S1, when the filter device 5 and the stirring cleaning device 6 are running, the detection device 7 will continuously detect the color of the waste liquid Permeability, when it is detected that the solution becomes colorless, it can be judged that the reaction is complete, preventing people from controlling the reaction time only by setting the time and making inaccurate judgments.

In this embodiment, (1) step 1, add 40 liters of waste liquid containing sodium polysulfide into the oxygen autoclave, control the temperature at 130°C, oxygen partial pressure at 1.5MPa, and react for 4 hours;

Step 2, the waste liquid is filtered to obtain yellow sulfur powder and colorless filtrate;

Step 3, feed ozone into the filtrate and carry out oxidation for 30min;

Step 4, concentrating and crystallizing the oxidized filtrate to obtain solid sodium sulfate.

(2) Step 1: Add 30 liters of waste liquid containing sodium polysulfide into the oxygen autoclave, control the temperature at 160°C, oxygen partial pressure at 2.0MPa, and react for 7 hours;

Step 2, the waste liquid is filtered to obtain yellow sulfur powder and colorless filtrate;

Step 3, in the filtrate, pass into ozone and carry out oxidation 40min;

Step 4, concentrating and crystallizing the oxidized filtrate to obtain solid sodium sulfate.

It is worth noting that: the existing autoclave needs to produce great pressure because of internal needs, and adopts thicker metal airtight to make more, but because needs to observe the color change of reaction solution in the S1 step as the judgment basis that the reaction finishes, The existing autoclave can only set the time, temperature and pressure, and it is difficult to observe the internal reaction from the outside. Due to the large difference in the sodium polysulfide content of the exhaust gas, the sulfur index and pH value are not an accurate value, resulting in The reaction time is difficult to judge. Pass the sodium polysulfide waste liquid into the barrel body 1 of the autoclave, start the filter device 5 and the detection device 7, the filter device 5 continuously filters the waste liquid in the barrel body 1 of the autoclave, and drives 6 pairs of stirring and cleaning devices at the same time Stir the waste liquid and clean the sulfur deposits on the surface of the filter device 5, so that the sulfur deposits enter the filter device 5 for continuous filtration and collection. The detection device 7 continuously detects the color permeability of the waste liquid. When it is detected that the solution becomes When it is colorless, it can be judged that the reaction is complete, preventing people from controlling the reaction time only by setting the time and making inaccurate judgments.

Example 2

Please refer to Fig. 9 to illustrate embodiment 2. This embodiment will further illustrate embodiment 1. In the illustration, the barrel of the autoclave 1 is provided with a bung 2, and the bottom of the barrel of the autoclave 1 is fixedly connected. There is a base 3, a plurality of support legs 4 are fixedly connected to the base 3, the filter device 5 includes a device plate 8, and a plurality of communication grooves 9 are provided on the device plate 8, and an insertion slot 10 is provided inside the device plate 8, The socket 10 is provided with a collection device 11 for filtering and collecting the sodium polysulfide waste liquid in the barrel body 1 of the autoclave, and the device disk 8 is provided with a drive member 12 for driving the device disk 8 to continuously reciprocate up and down The communication groove 9 is provided with the waste liquid above the device disk 8 to the bottom of the device disk 8 when the device disk 8 moves up, and when the device disk 8 moves down, the communication groove 9 is blocked to make the waste liquid completely The connection 13 for filter collection by the collection device 11 .

Please refer to Fig. 2, the detection device 7 in the illustration includes a plurality of light emitters 14 fixedly installed in the autoclave barrel 1, the inner wall of the autoclave barrel 1 is fixedly connected with a light receiver 15, and a plurality of light emitters The light from the device 14 is directed to the light receiver 15.

Please refer to Fig. 4-Fig. 10, the collection device 11 in the diagram comprises the collection box 16 that is plugged into the socket slot 10, the top of the collection box 16 is conical, and the bottom of the device tray 8 is provided with a plurality of first connections. Pipe 17, the bottom end of collection box 16 is provided with a plurality of second connection pipes 18 that communicate with the first connection pipe 17, the second connection pipe 18 communicates with the inside of collection box 16, and the top of the collection box 16 inner wall is fixedly connected There is a filter screen 19, the upper end of the filter screen 19 is fixedly connected with a one-way valve 20, a plurality of first extension springs 21 are fixedly connected in the collection box 16, and a plurality of first extension springs 21 are fixedly connected on the first extension spring 21 for blocking the second connecting pipe 18. Live blocking ball 22, device tray 8 is provided with a push-out member 23 for pushing the collection box 16 out of the insertion slot 10.

Please refer to Fig. 3 , the driving member 12 in the illustration includes a driving motor 24 fixedly installed on the base 3, the output end of the driving motor 24 is fixedly connected with a rotating rod 25 coaxially, and the rotating rod 25 runs through the body of the autoclave barrel 1 The bottom end is connected with the barrel body 1 of the pressurized kettle in rotation, and the top of the rotating rod 25 is coaxially fixedly connected with a reciprocating screw rod 26 threadedly connected with the device plate 8, and the inner wall of the barrel body 1 of the pressurized kettle is provided with a plurality of guide grooves 27 , the device tray 8 is fixedly connected with a plurality of guide blocks 28 which are respectively slidably connected with a plurality of guide grooves 27 .

In this embodiment, the motor model is preferably YYHS-40, and the starting drive motor 24 drives the rotating rod 25 to rotate, thereby driving the reciprocating screw mandrel 26 to rotate, and the reciprocating screw mandrel 26 drives the device disc 8 to move, and the device disc 8 moves between the guide block 28 and the guide Under the action of the limit guide of the groove 27, it continuously moves up and down. When the device plate 8 moves up, the connecting piece 13 opens the connecting groove 9. At this time, the waste liquid above will flow into the bottom of the device plate 8 through the connecting groove 9. When the device tray 8 moves down, the connecting piece 13 will block the communication groove 9. At this time, the waste liquid below the device tray 8 will flow into the second connecting pipe 18 through the first connecting pipe 17, and the blocking ball 22 will be pushed away. The tension spring 21 is stretched, and the waste liquid enters the collection box 16. After the waste liquid in the collection box 16 accumulates continuously, it passes through the filter 19 above and continues to filter. The solid precipitation remains in the collection box 16, and the liquid waste liquid passes through the filter. 19 and the one-way valve 20 flow into the space above the device tray 8, and the light emitter 14 can emit light to the light receiver 15 from all directions. When the light received by the light receiver 15 reaches the set value, the waste liquid Become colorless, that is the end of the reaction, stop the drive motor 24 at this time, push the device disc 8 to the top of the reciprocating screw mandrel 26, and take out the collection box 16 by the ejector 23, the bottom of the collection box 16 and the collection box The body of the box 16 is connected by threads, and can be turned and opened to pour out the collected sulfur deposits. The one-way valve 20 can only discharge the waste liquid from the collection box 16 to the top of the device tray 8, and the waste liquid above the device tray 8 cannot It flows into the collection box 16 through the one-way valve 20 .

Example 3

Please refer to Fig. 6-Fig. 8 to illustrate Embodiment 3. This embodiment will further illustrate Embodiment 1. The connecting member 13 in the illustration includes a plurality of stoppers 29 that are slidably connected with a plurality of communicating grooves 9, and the communicating grooves 9 A chute 30 slidably connected to the block 29 is provided on the side of the block 29 , a slope 31 is provided on the block 29 , and a first spring 32 fixedly connected to the chute 30 is fixedly connected to the plurality of block 29 .

Please refer to Fig. 4-Fig. 5, the push-out member 23 in the illustration includes the plug-in block 33 that is fixedly installed on the side of collecting box 16 and plug-in slot 10, and device tray 8 is provided with device slot 34, and device slot 34 An elastic warping rod 35 is connected in rotation, and the upper side of one end of the elastic warping rod 35 is in conflict with the bottom surface of the insertion block 33 , and the upper side of the other end is fixedly connected with a pressing block 36 .

Please refer to Fig. 6-Fig. 8, the agitating cleaning device 6 in the illustration comprises the rotating ring 37 that is connected with the top rotation of device disc 8, and the limit block 38 is fixedly connected on the rotating ring 37, and the reciprocating screw mandrel 26 is provided with and limit The position block 38 is slidably connected to the limit groove 39, and the rotating ring 37 is provided with the upper surface of the collection box 16 and the device plate 8 while the rotating ring 37 is rotating to drive the internal waste liquid of the autoclave body 1 to stir. Agitator cleaner 40 for cleaning.

Please refer to Fig. 6-Fig. 8, the agitation cleaning member 40 in the illustration comprises driving ring 41, is fixedly connected with a plurality of cleaning rods 42 that are all slidably connected with the upper surface of collection box 16 and device tray 8 on the driving ring 41, drives The ring 41 is fixedly connected with a plurality of stirring rods 43, the rotating ring 37 is provided with a plurality of engaging grooves 44, and the driving ring 41 is fixedly connected with a plurality of engaging blocks 45 which are engaged with the engaging grooves 44. 37 is threadedly connected with a fixed ring 46.

In this embodiment, when the device plate 8 moves up, the pressure of the waste liquid above the device plate 8 is high, which will push the slope surface 31 so that the stopper 29 slides into the chute 30, and compresses the first spring 32, thereby releasing the pressure on the communication groove. 9, when the device plate 8 moves down, the first spring 32 pushes out the stopper 29 to block the communication groove 9, because the bottom surface of the stopper 29 is a plane, the waste liquid cannot push the stopper 29, and now the waste liquid can only Enter the collection box 16 through the first connecting pipe to filter and collect, when the reciprocating screw rod 26 rotates, it will drive the limit groove 39 to rotate, thereby driving the limit block 38 to make the rotating ring 37 rotate, and the limit ring drives the drive ring 41 to rotate , so that the stirring rod 43 continuously stirs the waste liquid in the autoclave barrel 1, and at the same time, the cleaning rod 42 will rotate to scrape the accumulated sediment above the collection box 16 and the device plate 8 together, and move on the device plate 8 At this time, these sediments flow to the bottom of the device tray 8 through the communication groove 9. When the collection box 16 is installed, the collection box 16 is inserted into the insertion groove 10, and the insertion block 33 presses one end of the elastic warp bar 35. At the same time, the pressing block 36 at the other end is pushed out, after this the snap-in block 45 on the drive ring 41 is plugged into the snap-in slot 44 of the rotating ring 37, and the fixed ring 46 is screwed on the rotating ring 37. Now the cleaning rod 42 The upper end of the collection box 16 is pressed against, and the driving ring 41 and the collection box 16 can be fixed. When the reaction is completed, the rotating disc rotates to the uppermost end of the reciprocating screw rod 26, and the pressing block 36 is guided to the upper end of the groove 27 Pressing, the elastic warping rod 35 rotates and is blocked by the plug-in block 33 to produce bending. After turning out the fixing ring 46, the drive ring 41 is pulled out upwards, and the downward pressure on the collection box 16 can be released. At this time, the elastic warping rod 35 will The plugging block 33 is pushed up, so that the collection box 16 moves up and slides out of the slot 10 for a certain distance, so that people can take out the collection box 16 conveniently, and the cleaning rod 42 and the stirring rod 43 can also be cleaned simultaneously.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (10)

1. A method for treating sodium polysulfide-containing waste liquid by oxygen pressure is characterized by comprising the following steps:

s1, placing the waste liquid containing sodium polysulfide into a pressure kettle, controlling the temperature to be 120-200 ℃, controlling the oxygen partial pressure to be 1-2MPa, finishing the reaction when the color of the solution is changed from black brown to colorless, wherein the content of the sodium polysulfide in the waste liquid containing the sodium polysulfide is 5-40%, the sulfur index is 2-4, and the PH is 11-13, and the waste liquid containing the sodium polysulfide mainly comprises sodium disulfide, sodium trisulfide, sodium tetrasulfide and sodium thiosulfate;

s2, filtering to obtain yellow sulfur powder and filtrate;

s3, introducing ozone into the filtrate for oxidation, wherein sodium sulfite does not exist in the filtrate after the ozone oxidation reaction is finished;

and S4, concentrating and crystallizing the oxidized filtrate to obtain a sodium sulfate solid.

2. A method for the oxidative treatment of a waste liquid containing sodium polysulfide according to claim 1, comprising an autoclave barrel (1), a filtration device (5) and an agitation cleaning device (6), characterized in that: and in the step S1 and the step S2, introducing sodium polysulfide waste liquid into the autoclave barrel body (1), starting the filtering device (5), continuously filtering the waste liquid in the autoclave barrel body (1) by the filtering device (5), and simultaneously driving the stirring and cleaning device (6) to stir the waste liquid and clean sulfur precipitates on the surface of the filtering device (5), so that the sulfur precipitates enter the filtering device (5) for continuous filtering and collection.

3. A method for the oxidative treatment of a waste liquid containing sodium polysulfide according to claim 2, comprising a detection device (7), characterized in that: in the step S1, when the filtering device (5) and the stirring cleaning device (6) operate, the detection device (7) can continuously detect the color permeability of the waste liquid, and the reaction can be judged to be finished when the solution is detected to be colorless, so that the phenomenon that the reaction time is controlled by people only through setting time and the judgment is inaccurate is prevented.

4. The method according to claim 3, wherein the sodium polysulfide waste liquid is treated by oxygen pressure treatment, and the method comprises the following steps: the device comprises a pressurizing kettle barrel body (1), a barrel cover (2) is arranged on the pressurizing kettle barrel body (1), a base (3) is fixedly connected to the bottom of the pressurizing kettle barrel body (1), a plurality of supporting legs (4) are fixedly connected to the base (3), a filtering device (5) comprises a device disc (8), a plurality of communicating grooves (9) are formed in the device disc (8), an inserting groove (10) is formed in the device disc (8), a collecting device (11) used for filtering and collecting sodium polysulfide waste liquid in the pressurizing kettle barrel body (1) is arranged in the inserting groove (10), a driving piece (12) used for driving the device disc (8) to continuously reciprocate up and down is arranged on the device disc (8), a waste liquid above the device disc (8) is led to the lower portion of the device disc (8) when the device disc (8) moves up, the communicating grooves (9) are blocked when the device disc (8) moves down, and the waste liquid is completely filtered and collected through the collecting device (11).

5. The method according to claim 4, wherein the sodium polysulfide waste liquid is treated by oxygen pressure treatment, and the method comprises the following steps: the detection device (7) comprises a plurality of light emitters (14) fixedly mounted in the autoclave barrel body (1), the inner wall of the autoclave barrel body (1) is fixedly connected with a light receiver (15), and light of the light emitters (14) all irradiates the light receiver (15).

6. The method according to claim 5, wherein the sodium polysulfide waste liquid is treated by oxygen pressure treatment, and the method comprises the following steps: the collecting device (11) comprises a collecting box (16) connected with the insertion groove (10) in an inserting mode, the top end of the collecting box (16) is conical, a plurality of first connecting pipes (17) are arranged at the bottom of the device disc (8), a plurality of second connecting pipes (18) connected with the first connecting pipes (17) are arranged at the bottom end of the collecting box (16), the second connecting pipes (18) are communicated with the inside of the collecting box (16), a filter screen (19) is fixedly connected to the top end of the inner wall of the collecting box (16), a one-way valve (20) is fixedly connected to the upper end of the filter screen (19), a plurality of first tension springs (21) are fixedly connected in the collecting box (16), a blocking ball (22) blocked by the second connecting pipes (18) is fixedly connected to the first tension springs (21), and a pushing-out piece (23) pushed out from the insertion groove (10) is arranged on the device disc (8) and used for enabling the collecting box (16) to follow.

7. The method according to claim 6, wherein the sodium polysulfide waste liquid is treated by oxygen pressure treatment, and the method comprises the following steps: driving piece (12) including fixed mounting in driving motor (24) on base (3), the coaxial fixedly connected with dwang (25) of output of driving motor (24), dwang (25) run through the bottom of pressurized vessel staving (1), and with pressurized vessel staving (1) rotate to be connected, the coaxial fixedly connected with in top of dwang (25) with device dish (8) threaded connection's reciprocal lead screw (26), a plurality of guide way (27) have been seted up to pressurized vessel staving (1) inner wall, fixedly connected with is a plurality of respectively with a plurality of on device dish (8) guide block (28) of guide way (27) sliding connection.

8. The method according to claim 7, wherein the sodium polysulfide waste liquid is treated by oxygen pressure treatment, and the method comprises the following steps: the communicating piece (13) comprises a plurality of check blocks (29) which are respectively in sliding connection with the communicating grooves (9), sliding grooves (30) which are in sliding connection with the check blocks (29) are formed in the side faces of the communicating grooves (9), slope faces (31) are formed in the check blocks (29), and the check blocks (29) are fixedly connected with first springs (32) which are fixedly connected with the sliding grooves (30).

9. The method of claim 8, wherein the method comprises the steps of: the propelling part (23) comprises a collecting box (16) side face and a plug-in block (33) which is plugged in the plug-in groove (10) in a connecting mode, a device groove (34) is formed in the device disc (8), an elastic warping rod (35) is connected in the device groove (34) in a rotating mode, the upper side of one end of the elastic warping rod (35) is abutted to the bottom face of the plug-in block (33), and a pressing block (36) is fixedly connected to the upper side of the other end of the elastic warping rod.

10. The method according to claim 9, wherein the sodium polysulfide waste liquid is treated by oxygen pressure treatment, and the method comprises the following steps: stirring cleaning device (6) include with the top of device dish (8) rotates swivel becket (37) of connecting, fixedly connected with stopper (38) is gone up in swivel becket (37), set up on reciprocal lead screw (26) with stopper (38) sliding connection's spacing groove (39), be equipped with on swivel becket (37) and be used for when swivel becket (37) rotate drive right when pressurized tank staving (1) inside waste liquid stirs it is right to collect box (16) with the upper surface of device dish (8) carries out clear stirring cleaning member (40), stirring cleaning member (40) include drive ring (41), on drive ring (41) fixedly connected with a plurality of with collect box (16) with the equal sliding connection's of upper surface cleaning rod (42) of device dish (8), on drive ring (41) fixedly connected with a plurality of puddlers (43), a plurality of joint grooves (44) have been seted up on swivel becket (37), on drive ring (41) fixedly connected with a plurality of with joint groove (44) joint piece (45) mutually, joint ring (37) are connected with solid fixed ring (46).

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