CN114054492B - Front-end chemical oxidizer equipment for elemental phosphorus-containing polluted soil - Google Patents
Front-end chemical oxidizer equipment for elemental phosphorus-containing polluted soil Download PDFInfo
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- CN114054492B CN114054492B CN202111354750.5A CN202111354750A CN114054492B CN 114054492 B CN114054492 B CN 114054492B CN 202111354750 A CN202111354750 A CN 202111354750A CN 114054492 B CN114054492 B CN 114054492B
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- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
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- B09C1/08—Reclamation of contaminated soil chemically
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Abstract
The invention discloses a front-end chemical oxidizer device for elemental phosphorus-containing polluted soil, which comprises an underframe and a box body, wherein a stirring shaft is arranged in the box body, and a stirring knife is arranged on the stirring shaft; two ends of the stirring shaft extend out of the box body and are fixed through bearing supports respectively, the synchronous transmission assembly is connected with the stirring shaft, a driving assembly is further arranged at one end of the underframe, and the output end of the driving assembly is connected with and drives the active stirring shaft; a discharge port is formed in one end, far away from the driving assembly, of the lower portion of the box body, and a feeding box and a spraying assembly are arranged above the box body through a moving assembly; the equipment is used for stirring and oxidizing polluted soil through the arrangement of the box body and the stirring shaft, so that the concentration of white phosphorus in the soil can be reduced, and the subsequent combustion process is safer, more efficient, more economical and controllable; the method can solve the problems of high cost of single oxidation method medicament and incomplete oxidation of elemental phosphorus particles and phosphorus blocks, avoid large smoke quantity of single combustion method and reduce the consumption of tail gas purification medicament.
Description
Technical Field
The invention relates to the technical field of polluted soil treatment, in particular to front-end chemical oxidizer equipment for polluted soil containing elemental phosphorus.
Background
White phosphorus, also called yellow phosphorus, is a white to yellow waxy solid with a melting point of 44.1 deg.C, a boiling point of 280 deg.C, and a density of 1.82 g/cc. The white phosphorus has high activity and must be stored in water, and people can be poisoned and killed by inhaling 0.1 g of white phosphorus.
In the presence of oxygen deficiency and moisture, white phosphorus oxidizes very slowly and is accompanied by phosphorescence. The white phosphorus being heat-solubleConcentrated alkali solution to generate phosphine and hypophosphorous acid dihydrogen salt; the dry chlorine reacts with the excessive elemental phosphorus to generate phosphorus trichloride, and the excessive chlorine reacts with the elemental phosphorus to generate phosphorus pentachloride. The elemental phosphorus can be combusted in sufficient air to generate P 2 O 5 If the air is insufficient, phosphorus trioxide is produced.
In the process of urban change and development, after some factories are moved, the land where the original site is located cannot be directly used due to pollution, for example, the phosphorus-containing polluted soil can be used as the land for urban construction after being harmlessly treated and restored. The technology for treating the phosphorus-containing industrial solid waste or the soil containing the elemental phosphorus mainly comprises the following steps: combustion method, phosphorus steaming method, hydrothermal aeration method, in-situ stratified oxidation method, in-situ injection oxidation method, in-situ ex-situ control combustion method and the like, wherein the methods are respectively good and bad when being used singly and cannot completely repair soil. When the phosphorus-containing polluted soil is subjected to oxidation treatment, chemical oxidizer equipment is needed, and the existing equipment has defects in stirring uniformity, oxidation effect and treatment efficiency.
The Chinese patent application (publication No. CN 111689615A) discloses a method for treating wastewater after polluted soil remediation in 2020. After the wastewater passes through a primary sedimentation tank, the wastewater is self-retained to a chemical oxidation reactor by gravity, and after the wastewater passes through the chemical oxidation reactor, most organic matters in the wastewater are oxidized and removed; the chemical oxidation reactor is only suitable for treating wastewater, has poor treatment effect on the polluted soil, and is difficult to remove phosphorus-containing substances in the polluted soil.
Disclosure of Invention
The invention aims to provide front-end chemical oxidizer equipment for soil polluted by elemental phosphorus, aiming at the problems in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
the chemical oxidizer equipment for the front end of the soil polluted by elemental phosphorus comprises a chassis, wherein a box body is arranged on the chassis, at least two stirring shafts are arranged in the box body, each stirring shaft comprises a driving stirring shaft and a driven stirring shaft, the driving stirring shaft and the driven stirring shafts are respectively provided with a detachable adjustable stirring knife, the stirring knives on the adjacent stirring shafts are sequentially staggered in the axial direction, at most one stirring knife is arranged in the same cross section of the same stirring shaft, and the stirring knives are all inclined to the axis of the stirring shafts; two ends of the stirring shaft extend out of the box body and are fixed through bearing supports respectively, the bearing supports are mounted on the underframe, a synchronous transmission assembly is further arranged at a position close to the bearing supports, the synchronous transmission assembly is connected with the driving stirring shaft and the driven stirring shaft at the same time, a driving assembly is further arranged at one end of the underframe, and the output end of the driving assembly is connected with and drives the driving stirring shaft; the below of box is kept away from drive assembly's one end is equipped with the discharge gate, the top of box is equipped with the charging box through moving the subassembly, it spanes to move the subassembly the width direction of box, it spanes still to be equipped with on the moving the subassembly the rotatable spraying assembly of box.
The chemical oxidizer device can be used for stirring and oxidizing polluted soil by arranging the box body and the stirring shaft, so that the concentration of white phosphorus in the soil can be reduced, and the subsequent combustion process is safer, more efficient, more economic and controllable; the chemical oxidation equipment is matched with a combustion method for use, the chemical oxidation method is organically combined with the combustion method based on the spontaneous combustion characteristic of the white phosphorus, the problems of high medicament cost and incomplete oxidation of simple substance phosphorus particles and phosphorus blocks of a single oxidation method can be solved, the large smoke quantity of the single combustion method can be avoided, the consumption of a tail gas purification medicament can be reduced, and the combination of the two methods is very suitable for safe and harmless remediation of the white phosphorus polluted soil in the field.
The box sets up to upper portion open-ended structure, and is convenient the installation, the dismantlement and the adjustment of arbor and stirring sword also make things convenient for evenly to add and pollute soil, and the top is equipped with the case lid, can open and close according to actual conditions.
The stirring knife shaft and the stirring knife are arranged for fully stirring, mixing and adding the polluted soil and the oxidant to uniformly mix the polluted soil and the oxidant, and scattering and dispersing the agglomerated soil to be beneficial to the implementation of an oxidation reaction; the stirring shaft is set to be driven and active, the configuration of a driving assembly can be reduced, the synchronous rotation of the stirring shafts is realized through the single output end matched with the synchronous assembly, the rotation speed and the direction are controllable, the control of the mixing uniformity is facilitated, and the equipment cost can be reduced.
Stir the sword through the setting of reasonable crisscross and angle, can set up to minimum with the quantity that stirs the sword under the prerequisite that improves stirring mixing uniformity and efficiency, adopt the setting back of this application, can guarantee that the soil of every department in the box can both obtain the stirring and mix, also need not set up a large amount of stirring sword on the stirring axle, also need not take the spiral blade, the equipment cost and the preparation degree of difficulty of reduction.
Singly stir loading and unloading and adjustment that the sword can be independent, make things convenient for the maintenance and the change that singly stir the sword, stir the in-process for a long time, appear singly stir the sword serious can independently change, every stirs the sword moreover and all can independently adjust inclination around the stirring, such setting up very big improvement stir flexibility and the convenience that the sword used.
The setting that removes the subassembly can drive the charging box is favorable to evenly reinforced along box back and forth movement, pollutes soil process the charging box gets into in the box, can avoid excavating machinery to collide with when falling the material and stir the sword on the one hand, also can avoid soil direct impact arbor, on the other hand can reduce and pollute soil scattering everywhere when reinforced, and the oxidant also can be followed in addition interpolation in the charging box, under the assistance of removal subassembly, can be even spill in the box.
The spraying assembly can also move back and forth along with the moving assembly, so that the spraying assembly can spray according to actual smoke points, more purposefulness and pertinence are achieved, and water can be sprayed in the process of adding soil into the spraying assembly.
Furthermore, the stirring knives are distributed on the stirring knife shaft at equal intervals along the axis direction, and the included angle between the central axes of the adjacent stirring knives is 60-120 degrees.
Further, the inclination directions of all the stirring knives are the same, the width dimension of the stirring knife is a, the included angle between the stirring knife and the central axis of the stirring knife shaft is alpha, the distance between the orthographic projections of the edges of the two stirring knives on the sides adjacent to the stirring knife is b, and then a and b satisfy: b < a · cos α.
That is to say, only one inclined stirring knife is arranged on each stirring shaft in the same radial section, and adjacent stirring knives are arranged at certain intervals in the circumferential direction, so that the stirring knives on each shaft are obliquely arranged at equal intervals, the adjacent stirring knives have overlapped parts on the circumferential motion track, and the stirring knives between the adjacent stirring shafts are arranged in a staggered manner, so that each shaft is less provided with stirring knives, a larger stirring and mixing range can be obtained, and the stirring efficiency is improved.
Further, the stirring knife comprises a flat stirring knife body, one end of the stirring knife body is arranged in an arc shape, the other end of the stirring knife body is provided with a connecting screw rod, and the connecting screw rod radially penetrates through the stirring knife shaft and is fastened through a plurality of nuts; the driven stirring shaft and the driving stirring shaft are arranged in parallel in equal height, and the sweeping track of the end part of the stirring blade body on the driving stirring shaft in the same radial section is close to but not in contact with the sweeping track of the end part of the connecting screw rod on the driven stirring shaft.
The stirring cutter can be independently replaced for independent accessory products, the screw rod of the stirring cutter body penetrates through the reamer shaft in the replacement and installation mode, the operation is convenient and applicable, the inclination angle can be easily adjusted, the nut can comprise a locking nut and an adjusting nut, and a gasket can be arranged according to the actual distance for adjustment.
The sweeping track of the stirring knife under the rotation action of the stirring knife shaft can basically cover the whole width direction in the box body, a small gap which does not influence the rotation is kept between the stirring knife body and the inner wall of the box body, and a radial gap is also kept between the driven stirring knife shaft and the stirring knife on the driving stirring knife shaft.
Further, bearings are arranged in the bearing support in parallel, and the end part of the stirring shaft is sleeved and penetrates through the bearings; the synchronous transmission component comprises a transmission box body arranged on the underframe, and a synchronous gear or a synchronous belt connected with the stirring cutter shaft is arranged in the transmission box body.
Furthermore, the driving assembly comprises a driving motor arranged on the bottom frame, the output end of the driving motor is connected with a speed reducer, and the output end of the speed reducer is connected with the driving stirring cutter shaft through a coupler.
The driving motor provides power, the speed is adjusted through the speed reducer, the proper rotating speed is output to the driving stirring shaft, the driving stirring shaft rotates under the action of the synchronous transmission assembly in the rotating process, the driven stirring shaft also rotates, and under the rotating action of the driving stirring shaft and the driven stirring shaft, the stirring shafts can effectively mix polluted soil and an oxidant and uniformly disperse the polluted soil in the box body, so that the oxidation reaction can be effectively carried out.
Further, the moving assembly comprises a pair of parallel slide rails arranged on two sides of the underframe, a pair of movable vertical frames are respectively arranged on the slide rails, the feeding box is arranged between the two pairs of vertical frames, and the feeding box is used for adding and introducing polluted soil and/or an oxidizing agent; the spraying assembly is arranged between the vertical frames at two sides.
The vertical frame moves on the sliding rail to drive the feeding box and the spraying assembly to move together, and the vertical frame can avoid the box body in the moving process without influencing the opening and closing of the box cover.
Furthermore, a rotating shaft crossing the box body and a motor driving the rotating shaft to rotate are arranged on the moving assembly; the spray assembly comprises a water inlet main pipe arranged on the rotating shaft, the periphery of the water inlet main pipe is communicated with a plurality of water inlet branch pipes, and the end parts of the water inlet branch pipes are connected with rotary spray heads.
The motor drive the axis of rotation is rotatory, makes the person in charge of intaking can rotate not equidirectional and angle with the branch pipe of intaking, is favorable to the work of spraying of rotatory atomising head, rotatory atomising head also can spray the contaminated soil that the filling box exit flows.
Furthermore, both sides of the inner wall of the box body are arc-shaped, a bulge extending along the length direction is arranged in the middle of the bottom wall of the box body, and the cross section of the bulge is triangular; triangle-shaped the arch can be avoided polluting soil and pile up at the middle part to make the contaminated soil at middle part slide to both sides, be favorable to stirring the sword and stir contaminated soil, the inner wall both sides of box are established to the arc, and curved radian and the rotatory orbit looks adaptation of stirring the sword, and this is the gathering of both sides in the box of contaminated soil also.
Furthermore, the stirring knife shaft is a hollow shaft, so that the weight of the stirring knife shaft can be reduced, and the insertion of the connecting screw rod of the stirring knife is facilitated.
Further, one method of using the chemical oxidizer device is as follows: the screened white phosphorus contaminated soil is transported to a chemical oxidation workshop, a top cover of the box body is opened (through the feeding box) to uniformly add the contaminated soil into the box body, meanwhile, a composite oxidant is added (the mass adding ratio of the white phosphorus contaminated soil to the composite oxidant is about 1; and in the stirring oxidation process, if the polluted soil in the box body is insufficiently oxidized and smokes, the spraying assembly is started to carry out fixed-point spraying.
The method comprises the steps of adding a rechecking oxidant into a chemical oxidizer, stirring, oxidizing, standing, finally providing aerobic condition and temperature condition for white phosphorus combustion by utilizing the characteristic of low-temperature easy spontaneous combustion of white phosphorus, conveying the white phosphorus polluted soil subjected to primary oxidation treatment to a disposal workshop for spreading, heating, uniformly spreading and loosening, grinding to control combustion, and generating P by combustion 2 O 5 The smoke is absorbed and purified by a scrubbing tower, so that the white phosphorus is completely removed from the soil; more than 50% of simple substance phosphorus can be removed by the front-end chemical oxidation of the method, and the tail end is controlled to burn to remove the residual simple substance phosphorus in the polluted soil; the technology is simple in process, is an efficient and thorough white phosphorus contaminated soil remediation technology, and is extremely suitable for remediation of white phosphorus contaminated soil in urban areas.
Compared with the prior art, the invention has the beneficial effects that: 1. the chemical oxidizer device can be used for stirring and oxidizing polluted soil by arranging the box body and the stirring shaft, so that the concentration of white phosphorus in the soil can be reduced, the subsequent combustion process is safer, more efficient, more economic and controllable, and the harmless remediation of the polluted soil is facilitated; 2. the stirring shaft and the stirring knife are arranged for fully stirring, mixing and adding the polluted soil and the oxidant, so that the polluted soil and the oxidant are uniformly mixed, and simultaneously, the agglomerated soil is scattered and dispersed, thereby being beneficial to the implementation of an oxidation reaction; 3. the stirring knives are reasonably staggered and arranged at an angle, so that the number of the stirring knives is set to be minimum on the premise of improving the stirring and mixing uniformity and efficiency, a large number of stirring knives do not need to be arranged on a stirring knife shaft, a spiral blade does not need to be adopted, and the equipment cost and the manufacturing difficulty are reduced; 4. the single stirring knife can be independently assembled, disassembled and adjusted, so that the maintenance and the replacement of the single stirring knife are convenient, and the inclination angle of each stirring knife can be independently adjusted before and after stirring, so that the use flexibility and the convenience of the stirring knife are greatly improved; 5. the spraying component can also move back and forth along with the moving component, so that the spraying component can spray according to actual smoke output points, and the purposes and pertinence are improved; 6. more than 50% of simple substance phosphorus can be removed by the front-end chemical oxidation of the method, and the tail end is controlled to burn to remove the residual simple substance phosphorus in the polluted soil; the method is simple to use and operate, and the technology is used as an efficient and thorough white phosphorus contaminated soil remediation technology and is extremely suitable for remediation of white phosphorus contaminated soil in urban areas.
Drawings
FIG. 1 is a schematic diagram of a top view of a chemical oxidizer for the front end of a soil contaminated with elemental phosphorus according to the present invention;
FIG. 2 is a schematic structural diagram of a front-end chemical oxidizer for elemental phosphorus-contaminated soil according to the present invention;
FIG. 3 is a schematic structural view of the axial section of a stirring blade of the chemical oxidizer equipment at the front end of the soil polluted by elemental phosphorus in the invention;
FIG. 4 is a first schematic structural diagram of a moving assembly of the front-end chemical oxidizer device for contaminated soil containing elemental phosphorus according to the present invention;
FIG. 5 is a schematic structural diagram II of a moving assembly arranged on the front-end chemical oxidizer equipment for the soil polluted by elemental phosphorus according to the invention;
FIG. 6 isbase:Sub>A schematic cross-sectional view taken along line A-A of FIG. 5;
FIG. 7 is a schematic view of another arrangement structure of a stirring blade shaft of the chemical oxidizer device at the front end of the soil polluted by elemental phosphorus according to the invention;
in the figure: 1. a chassis; 2. a box body; 3. an active mixer shaft; 4. a driven beater shaft; 5. a stirring blade; 501. a stirring blade body; 502. connecting a screw rod; 503. a nut; 6. a bearing support; 7. a bearing; 8. a synchronous drive assembly; 9. a drive motor; 10. a speed reducer; 11. a coupling; 12. a discharge port; 13. a feed box; 14. a slide rail; 15. erecting a frame; 16. a rotating shaft; 17. a motor; 18. a main water inlet pipe; 19. a water inlet branch pipe; 20. rotating the spray head; 21. and (4) protruding.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "middle", "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
The first embodiment is as follows:
as shown in fig. 1 to 6, a chemical oxidizer device for the front end of soil polluted by elemental phosphorus comprises an underframe 1, wherein a box body 2 is arranged on the underframe 1, two stirring shafts are arranged in the box body 2, the stirring shafts comprise a driving stirring shaft 3 and a driven stirring shaft 4, detachable and adjustable stirring knives 5 are respectively arranged on the driving stirring shaft 3 and the driven stirring shaft 4, the stirring knives 5 on the adjacent stirring shafts are sequentially staggered in the axial direction, at most one stirring knife 5 is arranged in the same cross section on the same stirring shaft, and the stirring knives 5 are all inclined to the axes of the respective stirring shafts; two ends of each stirring shaft extend out of the box body 2 and are fixed through bearing supports 6 respectively, the bearing supports 6 are mounted on the underframe 1, a synchronous transmission assembly 8 is further arranged at a position close to the bearing supports 6, the synchronous transmission assembly 8 is simultaneously connected with the driving stirring shaft 3 and the driven stirring shaft 4, a driving assembly is further arranged at one end of the underframe 1, and the output end of the driving assembly is connected with and drives the driving stirring shaft 3; keep away from the below of box 2 drive assembly's one end is equipped with discharge gate 12, the top of box 2 is equipped with feed box 13 through the removal subassembly, the removal subassembly spanes the width direction of box 2, still be equipped with on the removal subassembly and span the rotatable spraying assembly of box 2.
The chemical oxidizer device can be used for stirring and oxidizing polluted soil by arranging the box body 2 and the stirring shaft, so that the concentration of white phosphorus in the soil can be reduced, and the subsequent combustion process is safer, more efficient, more economic and controllable; the chemical oxidation equipment is matched with a combustion method for use, the chemical oxidation method is organically combined with the combustion method based on the spontaneous combustion characteristic of the white phosphorus, the problems of high medicament cost and incomplete oxidation of simple substance phosphorus particles and phosphorus blocks of a single oxidation method can be solved, the large smoke quantity of the single combustion method can be avoided, the consumption of a tail gas purification medicament can be reduced, and the combination of the two methods is very suitable for safe and harmless remediation of the white phosphorus polluted soil in the field.
The box 2 is of an upper-part opening structure, so that the installation, the disassembly and the adjustment of the stirring shaft and the stirring knife 5 are convenient, the polluted soil is conveniently and uniformly added, and the box cover is arranged above the box body and can be opened and closed according to actual conditions.
The stirring shaft and the stirring knife 5 are arranged for fully stirring, mixing and adding the polluted soil and the oxidant to ensure that the polluted soil and the oxidant are uniformly mixed, and simultaneously dispersing the caked soil to be beneficial to the oxidation reaction; the stirring shaft is set to be driven and active, the configuration of a driving assembly can be reduced, the synchronous rotation of a plurality of stirring shafts is realized through the matching of a single output end and a synchronous assembly, the rotation speed and the direction are controllable, the control of the mixing uniformity is facilitated, and the equipment cost can be reduced.
Stir sword 5 through the setting of reasonable crisscross and angle, can set up to minimum stirring sword quantity under the prerequisite that improves stirring mixing uniformity and efficiency, adopt the setting back of this application, can guarantee that the soil of every department in the box 2 can both obtain stirring and mix, also need not set up a large amount of stirring sword on the stirring axle, also need not take the spiral blade, the equipment cost and the preparation degree of difficulty that reduce.
The setting that removes the subassembly can drive the charging box 13 is favorable to evenly reinforced along 2 back and forth movements of box, pollutes soil process charging box 13 gets into in the box, can avoid excavating machinery to collide with when falling the material and stir sword 5 on the one hand, also can avoid soil direct impact stirring axle, on the other hand can reduce when reinforced pollutes soil and scatter everywhere, and the oxidant also can be followed add in charging box 13, under the assistance of removing the subassembly, can be even spill in the box 2.
The spraying assembly can also move back and forth along with the moving assembly, so that the spraying assembly can spray according to actual smoke points, more purposefulness and pertinence are achieved, and water can be sprayed in the process of adding soil into the spraying assembly.
Further, the stirring blades 5 are distributed on the stirring shaft at equal intervals along the axial direction, and the included angle between the central axes of the adjacent stirring blades is 90 degrees.
Further, the inclination directions of all the stirring knives 5 are the same, the width dimension of the stirring knife 5 is a, the included angle between the stirring knife 5 and the central axis of the stirring knife shaft is α, and the distance between the orthographic projections of the edges of the two stirring knives on the adjacent sides of the stirring knife on the axis is b, so that a and b satisfy: b < a · cos α, and thus, although only one stirring blade 5 is disposed in one circle, the main body portion of the entire shaft can be covered by the sequentially disposed stirring blades as viewed from the axis.
That is to say, only be equipped with an inclined stirring sword 5 in same radial cross section on every stirring shaft, adjacent stirring sword 5 can be in the certain angle setting of interval in circumference for every epaxial stirring sword is not only equidistant inclined arrangement, and adjacent stirring sword has the coincidence portion on the motion trajectory of circumference, and the crisscross setting of stirring sword between the combination adjacent stirring shaft again makes every epaxial less arrange stirring sword but can obtain great stirring mixing range, and promotes stirring efficiency.
Further, the stirring knife 5 comprises a flat stirring knife body 501, one end of the stirring knife body 501 is arranged in an arc shape, the other end of the stirring knife body 501 is provided with a connecting screw 502, and the connecting screw 502 radially penetrates through the stirring knife shaft and is fastened through a plurality of nuts 503; the driven stirrer shafts 4 and the driving stirrer shafts 3 are arranged in parallel in equal height, and the sweeping tracks of the end parts of the stirrer bodies on the driving stirrer shafts 3 in the same radial section are close to but not in contact with the sweeping tracks of the end parts of the connecting screws on the driven stirrer shafts 4.
The stirring knife 5 can be independently replaced for an independent accessory product, the connection screw 502 of the stirring knife 5 penetrates through the reamer shaft in the replacement and installation mode and is fastened through the nut 503, the operation is convenient and applicable, the inclination angle is easy to adjust, the nut 503 can comprise a locking nut and an adjusting nut, and a gasket can be arranged according to the actual distance for adjustment.
The sweeping track of the stirring knife 5 under the rotation action of the stirring knife shaft can basically cover the whole width direction in the box body, a small gap which does not influence the rotation is kept between the stirring knife body 501 and the inner wall of the box body 2, and a small radial gap is also kept between the stirring knife 5 on the driven stirring knife shaft 4 and the driving stirring knife shaft 3.
Further, bearings 7 are arranged in the bearing support 6 in parallel, and the end parts of the stirring shafts are sleeved and penetrate through the bearings 7; the synchronous transmission component 8 comprises a transmission box body arranged on the underframe, and a synchronous gear component connected with the stirring cutter shaft is arranged in the transmission box body.
Furthermore, the driving assembly comprises a driving motor 9 arranged on the base frame 1, the output end of the driving motor 9 is connected with a speed reducer 10, and the output end of the speed reducer 10 is connected with the active stirring shaft 3 through a coupler 11.
The driving motor 9 provides power, the speed is adjusted through the speed reducer 10, the proper rotating speed is output to the driving mixer shaft 3, the driving mixer shaft 3 rotates under the action of the synchronous transmission assembly 8, the driven mixer shaft 4 also rotates, and under the rotation action of the driving mixer shaft 3 and the driven mixer shaft, the mixer 5 can effectively mix the polluted soil and the oxidant and uniformly disperse the polluted soil in the box body 2, so that the oxidation reaction can be effectively carried out.
Further, the moving assembly comprises a pair of parallel slide rails 14 arranged on two sides of the underframe 1, a pair of movable vertical frames 15 are respectively arranged on the slide rails 14, the feeding box 13 is arranged between the two pairs of vertical frames 15, and the feeding box 13 is used for adding and introducing polluted soil and/or an oxidizing agent; the spraying assembly is arranged between the vertical frames 15 at two sides.
The vertical frame 15 moves on the slide rail to drive the feeding box and the spraying assembly to move together, and the vertical frame 15 can also avoid the box body 2 in the moving process without influencing the opening and closing of the box cover.
Further, as shown in fig. 6, a rotating shaft 16 crossing the box body 2 and a motor 17 driving the rotating shaft 16 to rotate are arranged on the stand 15; the spraying assembly comprises a water inlet main pipe 18 arranged on the rotating shaft 16, the periphery of the water inlet main pipe 18 is communicated with a plurality of water inlet branch pipes 19, and the end parts of the water inlet branch pipes 19 are connected with rotary spraying heads 20.
Furthermore, both sides of the inner wall of the box body 2 are arc-shaped, a protrusion 21 extending along the length direction is arranged in the middle of the bottom wall of the box body 2, and the cross section of the protrusion 21 is triangular; triangle-shaped protruding 21 can avoid polluting soil and pile up at the middle part to make the contaminated soil at middle part slide to both sides, be favorable to stirring sword 5 to stir contaminated soil, the inner wall both sides of box 2 are established to the arc, and curved radian and the rotatory orbit looks adaptation of stirring sword, this aggregation of also avoiding polluting soil both sides in the box.
Furthermore, the stirring knife shaft is a hollow shaft, so that the weight of the stirring knife shaft can be reduced, and the penetration of the connecting screw rod of the stirring knife 5 is facilitated.
The second embodiment:
this example provides a use of the chemical oxidizer apparatus and oxidation method of example one.
The length of the box body is about 7m, the width of the box body is about 1.2m, the height of the box body is about 1m, a driven stirrer shaft and a driving stirrer shaft are arranged in the box body, the rotating speed of the driving stirrer shaft is about 60rpm, and the maximum processing capacity of polluted soil is 50-80t/h.
The screened white phosphorus contaminated soil (in which sundries such as iron ware and wood blocks are removed to avoid damaging a stirrer shaft) is transported to a chemical oxidation workshop, a top cover of the box body 2 is opened (through the charging box 13) to uniformly add the contaminated soil into the box body, and meanwhile, a composite oxidant (the mass adding ratio of the white phosphorus contaminated soil to the composite oxidant is about 1; then starting the stirrer shaft to continuously stir and oxidize for 40-60 minutes, pumping the slurry to a steel slurry pool, standing for about 10 minutes, and pumping and discharging supernatant in the slurry pool into the box body 2 (or through the spray assembly) for recycling; and in the stirring oxidation process, if the polluted soil in the box body 2 is not sufficiently oxidized and the smoking condition exists, the spraying assembly is started to carry out fixed-point spraying.
The method comprisesAdding a rechecking oxidant (composite solution of main agent NaCLO, sub agent NaOH and the like) into a chemical oxidizer, stirring, oxidizing, standing, finally providing an aerobic condition and a temperature condition for white phosphorus combustion by utilizing the characteristic of low-temperature and spontaneous combustion of white phosphorus, conveying the white phosphorus polluted soil subjected to primary oxidation treatment to a treatment workshop for spreading, heating, uniformly spreading and loosening, grinding to control combustion, and generating P by combustion 2 O 5 The smoke is absorbed and purified by a scrubbing tower, so that the white phosphorus is completely removed from the soil; more than 50% of simple substance phosphorus can be removed by chemical oxidation at the front end of the method, and the residual simple substance phosphorus in the polluted soil is removed by controlling combustion at the tail end; the technology is simple in process, is an efficient and thorough white phosphorus contaminated soil remediation technology, and is extremely suitable for remediation of white phosphorus contaminated soil in urban areas.
Wherein the oxidation reaction process of the white phosphorus is as follows:
5ClO - +2P+6OH - →5Cl - +2PO 4 3- +3H 2 O；
the white phosphorus combustion process occurs as follows:
4P+5O 2 →2P 2 O 5 。
example three:
the difference between the present embodiment and the first embodiment is that another arrangement of the cutter shafts is provided.
As shown in fig. 7, the number of the stirrer shafts is 4, one of the stirrer shafts is a driving stirrer shaft, the other 3 stirrer shafts are driven stirrer shafts, an arrangement mode of an upper layer, a lower layer and a left row and a right row is adopted, and the same stirrer shafts are arranged at equal intervals in a staggered mode, so that the stirring efficiency and the treatment capacity in unit time can be further improved, and the arrangement mode does not increase the length and width of the box body 2 and slightly increases the height.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The front-end chemical oxidizer equipment for the soil polluted by elemental phosphorus is characterized by comprising a bottom frame, wherein a box body is arranged on the bottom frame, at least two stirring shafts are arranged in the box body, each stirring shaft comprises a driving stirring shaft and a driven stirring shaft, the driving stirring shafts and the driven stirring shafts are respectively provided with a detachable adjustable stirring knife, the stirring knives on the adjacent stirring shafts are sequentially staggered in the axial direction, at most one stirring knife is arranged in the same radial section on the same stirring shaft, and the stirring knives are all inclined to the axis of the stirring shafts; two ends of the stirring shaft extend out of the box body and are fixed through bearing supports respectively, the bearing supports are mounted on the underframe, a synchronous transmission assembly is further arranged at a position close to the bearing supports, the synchronous transmission assembly is connected with the driving stirring shaft and the driven stirring shaft at the same time, a driving assembly is further arranged at one end of the underframe, and the output end of the driving assembly is connected with and drives the driving stirring shaft; a discharge port is formed in one end, far away from the driving assembly, of the lower portion of the box body, a feeding box is arranged above the box body through a moving assembly, the moving assembly stretches across the width direction of the box body, and a rotatable spraying assembly stretching across the box body is further arranged on the moving assembly;
the stirring knives are distributed on the stirring knife shaft at equal intervals along the axis direction, and the included angle between the central axes of the adjacent stirring knives on the same stirring knife shaft is 60-120 degrees; the inclined directions of all the stirring knives are the same, the width dimension of the stirring knives is a, and the included angle between the stirring knives and the central axis of the stirring knife shaft is
And the distance between the orthographic projections of the two stirring blade edges on the axis of the two stirring blade edges on the adjacent sides of the same stirring blade shaft is b, then a and b satisfy:
(ii) a So that the stirring blades on the stirring blade shafts are obliquely arranged at equal intervals and are the sameThe adjacent stirring knives on the stirring knife shafts have overlapped parts on the circumferential motion track, and the stirring knives between the adjacent stirring knife shafts are arranged in a staggered mode, so that less stirring knives are arranged on each stirring knife shaft, a larger stirring and mixing range can be obtained, and the stirring efficiency is improved;
the stirring knife comprises a flat stirring knife body, one end of the stirring knife body is arranged in an arc shape, the other end of the stirring knife body is provided with a connecting screw rod, and the connecting screw rod radially penetrates through the stirring knife shaft and is fastened through a plurality of nuts; the driven stirring shaft and the driving stirring shaft are arranged in parallel and in equal height, and the sweeping track of the end part of the stirring blade body on the driving stirring shaft in the same radial section is close to but not in contact with the sweeping track of the end part of the connecting screw rod on the driven stirring shaft;
both sides of the inner wall of the box body are arranged in an arc shape, the radian of the arc shape is matched with the rotating track of the stirring knife, a bulge extending along the length direction is arranged in the middle of the bottom wall of the box body, and the cross section of the bulge is triangular;
one method of use of the chemical oxidizer device is: transporting the screened white phosphorus contaminated soil to a chemical oxidation workshop, opening a top cover of the box body, uniformly adding the contaminated soil into the box body through the feeding box, simultaneously adding a composite oxidant, starting the stirring shaft to continuously stir and oxidize for 40-60 minutes, pumping the slurry to a steel slurry pool, standing, and pumping and discharging supernatant of the slurry pool into the box body for recycling; and in the stirring oxidation process, if the polluted soil in the box body is insufficiently oxidized and smokes, the spraying assembly is started to carry out fixed-point spraying.
2. The front-end chemical oxidizer equipment for elemental phosphorus-containing polluted soil as claimed in claim 1, wherein bearings are arranged in parallel in the bearing support, and the end parts of the stirrer shafts are sleeved and penetrate through the bearings; the synchronous transmission assembly comprises a transmission box body arranged on the underframe, and a synchronous gear or a synchronous belt connected with the stirring cutter shaft is arranged in the transmission box body.
3. The front-end chemical oxidizer equipment for soil polluted by elemental phosphorus as claimed in claim 1, wherein the driving assembly comprises a driving motor arranged on the bottom frame, the output end of the driving motor is connected with a speed reducer, and the output end of the speed reducer is connected with the driving stirring cutter shaft through a coupling.
4. The front-end chemical oxidizer equipment for contaminated soil containing elemental phosphorus as claimed in claim 1, wherein said moving assembly comprises a pair of parallel slide rails disposed on two sides of said bottom frame, said slide rails are respectively provided with a pair of movable vertical frames, said feeding box is disposed between two pairs of said vertical frames, said feeding box is used for feeding contaminated soil and oxidant; the spraying assembly is arranged between the vertical frames at two sides.
5. The front-end chemical oxidizer equipment for soil polluted by elemental phosphorus as claimed in claim 1 or 4, wherein a rotating shaft crossing the box body and a motor driving the rotating shaft to rotate are arranged on the moving assembly; the spraying assembly comprises a water inlet main pipe arranged on the rotating shaft, the periphery of the water inlet main pipe is communicated with a plurality of water inlet branch pipes, and the end parts of the water inlet branch pipes are connected with rotary spraying heads.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111354750.5A CN114054492B (en) | 2021-11-16 | 2021-11-16 | Front-end chemical oxidizer equipment for elemental phosphorus-containing polluted soil |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111354750.5A CN114054492B (en) | 2021-11-16 | 2021-11-16 | Front-end chemical oxidizer equipment for elemental phosphorus-containing polluted soil |
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| CN114054492A CN114054492A (en) | 2022-02-18 |
| CN114054492B true CN114054492B (en) | 2022-11-29 |
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| CN111672895A (en) * | 2020-06-30 | 2020-09-18 | 中科鼎实环境工程有限公司 | Device for repairing phosphorus-containing contaminated soil |
| CN112023815A (en) * | 2020-08-21 | 2020-12-04 | 湖南中联重科混凝土机械站类设备有限公司 | Stirring device and stirrer |
| CN212442538U (en) * | 2020-06-30 | 2021-02-02 | 中科鼎实环境工程有限公司 | Device for repairing phosphorus-containing contaminated soil |
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| JP2008212888A (en) * | 2007-03-07 | 2008-09-18 | Kyc Machine Industry Co Ltd | Double-shaft mixer for kneading viscous fluid |
| CN207698619U (en) * | 2017-11-08 | 2018-08-07 | 衢州市蓝天环保节能设备厂 | Bipacking-auger |
| CN110064649A (en) * | 2019-06-04 | 2019-07-30 | 王国建 | A kind of engagement type dystopy soil remediation improvement is pulverized and mixed device with soil |
| CN111450726A (en) * | 2020-04-27 | 2020-07-28 | 山东金萃冶金技术有限公司 | High-efficient horizontal biax axial flow continuous stirring ware |
| CN111672895A (en) * | 2020-06-30 | 2020-09-18 | 中科鼎实环境工程有限公司 | Device for repairing phosphorus-containing contaminated soil |
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| CN114054492A (en) | 2022-02-18 |
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