CN217677124U

CN217677124U - Pre-filtering column

Info

Publication number: CN217677124U
Application number: CN202222047229.3U
Authority: CN
Inventors: 陈彩霞; 李辉; 陆克槨; 单春峰; 李子圣
Original assignee: Beijing Brunt Technology Co ltd
Current assignee: Zhongjie Tingyu Jiangsu Environmental Technology Co ltd
Priority date: 2022-08-05
Filing date: 2022-08-05
Publication date: 2022-10-28
Anticipated expiration: 2032-08-05

Abstract

The utility model discloses a prefiltration post, it is applicable to multistage filter-pressing rupture of membranes mercury purification device under the normal atmospheric temperature condition, it is including prefiltration post outlet end cover, prefiltration post filter tube and prefiltration post inlet end cover, prefiltration post filter tube is double-thread quartz glass pipe, prefiltration post filter tube both ends are passed through the screw thread mode and are connected prefiltration post outlet end cover and prefiltration post inlet end cover respectively, prefiltration post outlet end cover, prefiltration post filter tube encloses into the space that is used for holding the filtration of prefiltration post with prefiltration post inlet end cover jointly. The utility model discloses a scheme adopts prefiltering post, secondary filter and tertiary filter to constitute multistage screen cloth mesh number and increases progressively and filter the combination, founds the continuous rupture of membranes of pressure extrusion and optimizes functional structure system, make full use of mercury for normal atmospheric temperature high density liquid, high specific surface tension's nature and multistage screen cloth extrusion friction rupture of membranes effect.

Description

Pre-filtering column

Technical Field

The utility model belongs to the technical field of the mercury purification, specifically relate to a prefiltration post, it is applicable to multistage filter-pressing rupture of membranes mercury purification technology under the normal atmospheric temperature condition.

Background

Mercury is a silvery white liquid metal, is often called mercury, and has important application in the fields of chemical industry, electrical appliances, instruments, medicine, metallurgy, military industry and new technology. Particularly, the mercury intrusion method is the most reliable detection method for determining the pore structure of rock and knowing the stratum characteristics in geological laboratories at present, and no better alternative detection means exists at present. The pollution mercury which is generated after the mercury pressing method detection test and contacts with the detection medium has low purity and can not be used continuously, if the pollution mercury can not be treated and purified in time and in an environment-friendly way, the storage and accumulation of the pollution mercury can cause huge environment-friendly safety risks, and even the geological stratum is influenced by the control and the limitation of the total amount of the pollution mercury received and can not be normally detected or tested. Therefore, the crude mercury which does not meet the mercury standard for mercury-pressing method experimental detection and has the mercury purity lower than 98% needs to be purified and reprocessed for recycling, which has important significance for economy and environmental protection.

The traditional mercury purification methods at present can be roughly divided into two types: high-temperature vacuum distillation purification is required, and extremely toxic high-temperature mercury vapor is generated, so that great safety and environmental protection risks exist; and the other method needs chemical-electrochemical treatment and purification, generates secondary dangerous waste, and is difficult to popularize and apply due to complex treatment process, large occupied space and harsh application conditions.

SUMMERY OF THE UTILITY MODEL

Based on the technical problem that exists among the prior art, the utility model provides a prefiltration post, it is applicable to multistage filter-pressing rupture of membranes mercury purification device under a normal atmospheric temperature condition.

The foundation the technical scheme of the utility model, the utility model provides a prefiltration post, it is applicable to multistage filter-pressing rupture of membranes mercury purification device under the normal atmospheric temperature condition, it is including prefiltration post outlet end cover, prefiltration post filter tube and prefiltration post inlet end cover, prefiltration post filter tube is double thread quartz glass pipe, prefiltration post filter tube both ends are passed through the screw thread mode and are connected prefiltration post outlet end cover and prefiltration post inlet end cover respectively, prefiltration post outlet end cover, prefiltration post filter tube and prefiltration post inlet end cover enclose into the space that is used for holding the filtration of prefiltration post jointly.

The filtering structure of the pre-filtering column comprises two glass fiber parts close to the outlet end cover of the pre-filtering column and the inlet end cover of the pre-filtering column and a quartz glass ball part positioned in the middle. Furthermore, the filtering structure of the pre-filtering column is a filtering layer which is sequentially filled according to a sandwich structure along the filtering direction, namely a front end glass fiber part with the length of one third of the length of the filtering pipe of the pre-filtering column, a middle quartz glass ball part with the length of one third of the length of the filtering pipe of the pre-filtering column and a rear end glass fiber part with the length of one third of the length of the filtering pipe of the pre-filtering column.

Preferably, interfaces for connection are arranged on the outlet end cover of the pre-filtering column and the inlet end cover of the pre-filtering column, and the interfaces penetrate through the inner space and the outer space of the pre-filtering column. More preferably, the multistage filter-pressing membrane-breaking mercury purification device applied to the pre-filtration column under the normal temperature condition comprises an air pressure driving unit, a coarse mercury bottle, the pre-filtration column, a secondary filter, a tertiary filter and a fine mercury collecting bottle which are sequentially connected through a pipeline assembly; the pneumatic driving unit is used for filling mercury to be filtered in an upper cavity of the secondary filter and an upper cavity of the tertiary filter, pressurizing and filtering a lower cavity of the secondary filter and a lower cavity of the tertiary filter and flushing a flow pipeline; the crude mercury bottle is used for quantitatively storing crude mercury or polluted mercury to be treated; the pre-filtering column is used for primary filtering of coarse mechanical impurities in coarse mercury or polluted mercury, and reduces pollution and flow blockage to the secondary filter; the secondary filter is used for filtering fine dust impurities and realizing filter pressing and mechanical vibration comprehensive rupture of the mercury soot mixture; the three-stage filter is used for further fine filtration of the second-stage filtered mercury, oxidation film dissolution, reverse flushing circulation of deionized water buoyancy and other deep purification; the fine mercury collecting bottle is used for collecting and storing fine mercury which reaches mercury standard for mercury pressing experiments after being sequentially and gradually purified through pre-filtering column filtering, secondary filter filtering, tertiary filter filtering, deionized water reverse buoyancy flushing and the like.

Additionally, the air pressure driving unit comprises a nitrogen generator and a nitrogen buffer tank, the output end of the nitrogen generator is connected with the input end of the nitrogen buffer tank through a nitrogen source electromagnetic valve, and an inlet pressure sensor is arranged on a pipeline between the nitrogen source electromagnetic valve and the nitrogen buffer tank; the output end of the nitrogen buffer tank is connected with the input end of the thick mercury bottle through an electromagnetic valve at the outlet of the buffer tank; an external blow-down pipe is further branched on the pipeline between the nitrogen buffer tank and the crude mercury bottle, and a gas-liquid blow-down port electromagnetic valve is arranged in the external blow-down pipe.

Furthermore, the input end of the thick mercury bottle is connected with a thick mercury feeding unit which comprises a sample feeding pipe, the input end of the sample feeding pipe is used for connecting and storing an external thick mercury container for storing mercury to be purified, the output end of the sample feeding pipe is connected with a sample feeding pressurizing pump, and the output end of the sample feeding pressurizing pump is connected with a feed inlet of the thick mercury bottle through a thick mercury feeding electromagnetic valve.

Furthermore, the output end of the coarse mercury bottle is connected with the input end of the pre-filtering column through a coarse mercury outlet electromagnetic valve, and the output end of the pre-filtering column is connected with the input end of the secondary filter through a pre-filtering column outlet electromagnetic valve. The secondary filter is provided with a secondary upper cavity, a secondary filter pipe and a secondary lower cavity which are sequentially communicated from top to bottom, a discharge hole at the bottom of the secondary lower cavity is connected with the input end of the tertiary filter through a tertiary filter inlet electromagnetic valve, and an intermediate pressure sensor is further arranged on a pipeline between the secondary filter and the tertiary filter inlet electromagnetic valve.

Preferably, the tertiary filter is provided with a tertiary upper cavity, a tertiary filter pipe and a tertiary lower cavity which are sequentially communicated from top to bottom, and a discharge hole at the bottom of the tertiary lower cavity is sequentially connected with the fine mercury collecting bottle through a mercury outlet electromagnetic valve and a fine mercury filling control electromagnetic valve of the tertiary filter.

Compared with the prior art, the utility model discloses prefiltration post's beneficial technological effect as follows:

1. the pre-filtering column has reliable performance, safety, environmental protection and high environmental applicability, can realize in-situ environmental protection treatment, and reduces the risk of secondary pollution diffusion and transfer; and the absolute amount of mercury in a laboratory can be reduced, the recycling is promoted, and the method has good economic benefit, environmental protection social benefit and meets the requirement of environmental protection policy encouragement.

2. The utility model discloses a thick mercury of scheme development design shakes and sieves class cone + cylinder combination inner chamber design in both ends about secondary filter and the tertiary fine filter, the centre adopts reducing hole and second grade or tertiary filtration tube structure built-up connection, the structure is upper and lower both ends wide, middle thin dumbbell column structure, this secondary filter can realize shaking and sieves friction and constant flow variable cross section tubule acceleration effect and venturi pipe throttle interface front and back pressure differential expansion effect reinforcing friction mixed filter effect, mainly according to the hydrodynamics rationale.

3. The three-stage filter structure design of the pre-filter column not only applies the Venturi tube effect, but also adopts three layers of screens which gradually reduce meshes (namely increase the mesh number of the screens), so that more micro variable flow cross-section mesh effects are formed, and microsphere particle high-interface tension microsphere droplets containing dust and oxide films are further extruded and deformed and rubbed when passing through mesh holes, so that the filtering effect is further improved.

4. The utility model discloses a scheme adopts prefiltering post, secondary filter and tertiary filter to constitute multistage screen cloth mesh number and increases progressively and filter the combination, founds the continuous rupture of membranes of pressure extrusion and optimizes functional structure system, make full use of mercury for normal atmospheric temperature high density liquid, high specific surface tension's nature and multistage screen cloth extrusion friction rupture of membranes effect.

Drawings

Fig. 1 is the structural schematic diagram of the multistage filter-pressing membrane-breaking mercury purification device under the normal temperature condition.

Fig. 2 is a schematic sectional structure diagram of the pre-filtering column of the present invention.

Fig. 3A is a schematic view of the assembly of the parts of the two-stage filter according to the present invention.

Fig. 3B is a schematic cross-sectional structure diagram of the two-stage filter of the present invention.

Fig. 4A is a schematic sectional structure diagram of the three-stage filter of the present invention.

Fig. 4B is a partially enlarged view of a portion of the tertiary filter tube of fig. 4A.

Fig. 5 is a schematic structural view of the transmittance detection module and the detection tube of the present invention.

Fig. 6 is a schematic structural diagram of a mercury removal filter preferably used in the deionized water circulation mercury removal filter and/or the sewage discharge mercury removal filter of the present invention.

Reference numbers in the figures illustrate:

1. the nitrogen source inlet controls the electromagnetic valve; 2. an outlet electromagnetic valve of the buffer tank; 3. a gas-liquid vent electromagnetic valve; 4. a crude mercury feeding control electromagnetic valve; 5. flow isolating electromagnetic valves; 6. a crude mercury outlet solenoid valve; 7. an outlet electromagnetic valve of the pre-filtering column; 8. a filtering and flushing bypass electromagnetic valve; 9. the secondary filter isolates the electromagnetic valve; 10. a secondary filter flushing solenoid valve; 11. an inlet electromagnetic valve of the tertiary filter; 12. cleaning the electromagnetic valve at the top of the tertiary filter; 13. a mercury outlet electromagnetic valve of the tertiary filter; 14. the electromagnetic valve is isolated at the top of the detection pipe; 15. an outlet electromagnetic valve of the liquid medicine pump; 16. an outlet electromagnetic valve of the deionized water circulating pump; 17. a fine mercury filling control electromagnetic valve; 18. a de-ionized water return inlet solenoid valve; 19. a discharge cycle switching solenoid valve; 20. a sewage discharge electromagnetic valve;

21. pre-filtering the column; 22. a secondary filter; 23. a third filter; 24. a deionized water circulating mercury removal filter; 25. a mercury removing filter for discharging sewage;

26. a sample injection pressurizing pump; 27. a liquid medicine pump; 28. a deionized water circulating pump; 29. a nitrogen generator; 30. a vortex oscillator; 31. an inlet pressure sensor; 32. an intermediate pressure sensor; 33. an outlet pressure sensor;

34. a low pressure nitrogen buffer tank; 35. a coarse mercury bottle; 36. a fine mercury collecting bottle; 37. a detection tube; 38. a purified liquid medicine bottle; 39. a deionized water bottle; 40. an outlet sewage bottle; 41. a light transmittance detection module;

211. a glass fiber part; 212. a quartz glass ball section; 213. an outlet end cover of the pre-filtering column; 214. a pre-filter column filter tube; 215. an inlet end cover of the pre-filtering column;

2201. a secondary top helical end cap; 2202. a second-stage vibrating screen friction cavity; 2203. a second-stage intermediate reducing pipe; 2204. a secondary coarse mercury receiving cavity; 2205. a first-stage screen mesh of a secondary filter; 2206. a first O-ring seal; 2207. a second stage filter screen of the second stage filter; 2208. a second O-ring seal; 2209. a feed inlet of the secondary filter; 2210. a secondary filter drain outlet; 2211. a discharge hole of the secondary filter;

2301. a feed inlet of a third-stage filter; 2302. a tertiary upper inlet seat; 2303. a third-level upper flange seat; 2304. a third O-shaped sealing ring; 2305. a stud; 2306. a third-level lower flange seat; 2307. a fourth O-shaped sealing ring; 2308. a tertiary lower outlet seat; 2309. a discharge port of the third-stage filter; 2310. an upper seal ring; 2311. a three-stage hollow filter column; 2312. an O-shaped sealing ring at the inner side of the upper part; 2313. a squeezing ring; 2314. a first inner column; 2315. a gap portion O-shaped seal ring; 2316. a second inner column; 2317. a lower O-shaped seal ring; 2318. an O-shaped sealing ring of the insertion part; 2319. a stainless steel mesh sheet; 2320. a filter screen of the third-stage filter; 2321. an upper outlet of the tertiary filter;

4101. a light transmittance detector; 4102. a stepping motor; 4103. a bracket is fixed at the upper end of the detection tube; 4104. a fixed bracket is arranged at the lower end of the detection tube; 4105. a linear guide rail; 4106. a clamp plate is arranged on the detector; 371. detecting an upper interface of the tube; 372. detecting a lower pipe interface;

241. sealing an end cover at the inlet of the mercury removal filter; 242. mercury removal resin; 243. a mercury removal filter tube; 244. and sealing the end cover at the outlet of the mercury removal filter.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model discloses a prefiltering post, it is applicable to multistage filter-pressing rupture of membranes mercury purification device under the normal atmospheric temperature condition, it is including prefiltering post outlet end cover, prefiltering post filter tube and prefiltering post inlet end cover in advance, prefiltering post filter tube is double thread quartz glass pipe, prefiltering post filter tube both ends and passing through the screw thread mode and connect prefiltering post outlet end cover and prefiltering post inlet end cover respectively, prefiltering post outlet end cover, prefiltering post filter tube and prefiltering post inlet end cover enclose into the space that is used for holding the filtration of prefiltering the post jointly. The utility model discloses a scheme adopts prefiltering post, secondary filter and tertiary filter to constitute multistage screen cloth mesh number and increases progressively and filter the combination, founds the continuous rupture of membranes of pressure extrusion and optimizes functional structure system, make full use of mercury for normal atmospheric temperature high density liquid, high specific surface tension's nature and multistage screen cloth extrusion friction rupture of membranes effect.

The utility model discloses a second grade filter 22 and tertiary filter 23 of original design make the crude mercury that has mercury soot structure pass through multistage filter screen under the atmospheric pressure drive effect, realize the purification of multistage filter-pressing rupture of membranes under the normal atmospheric temperature condition.

The technical principle of the multi-stage filter-pressing membrane-breaking mercury purification process under the normal temperature condition is as follows: through adopting innovation functional structure design and multistage filtration flow optimization combination, utilize the broken membrane of sieve that shakes friction, multistage filter-pressing broken membrane, buoyancy reverse flushing circulation purify and comprehensive purification processes such as big density difference gravity differentiation layering extraction purification, realized under the normal atmospheric temperature condition purification application target up to standard of thick mercury, the utility model discloses technical scheme and traditional high temperature distillation purification method and chemistry-electrochemistry and other traditional methods are comparatively speaking, have personnel's operational environment safer, and environmental pollution secondary diffusion shifts harm littleer advantage, are fit for utilizing widely in the small-scale scene in a plurality of professional field specialty laboratories that mercury utilized. The utility model relates to a multistage filter-pressing rupture of membranes mercury purification device and method under normal atmospheric temperature condition have ensured that outer sewage discharge accords with relevant environmental protection standard. The method adopts an automatic and miniaturized integrated process flow for manufacturing, improves the applicability of the application environment, realizes the on-site timely environment-friendly treatment by a mercury laboratory, and reduces the risk of secondary pollution diffusion transfer.

In the crude mercury having impurities, mercury and most of the media have a characteristic of high interfacial tension, so that an oxide film or a dust interfacial film may be formed on an outer layer of mercury. For example, mercury soot is a loose substance formed in the mercury refining process and composed of small mercury beads, fine mineral dust, arsenic antimony oxide, hydrocarbon, water, mercury sulfide, mercury sulfate and the like, and mercury soot structure also exists in the polluted mercury detected by mercury overpressure method. The mercury beads are surrounded by a tough film and dispersed in the medium, so that the film needs to be broken during the physical purification treatment to release mercury and polymerize the mercury together, which is called "membrane rupture". For example, mercury is recovered by washing with water to remove most of the soot and separate mercury which is easily polymerized, and then placing into a mercury soot machine to destroy the membrane on the surface of mercury under mechanical compression to polymerize mercury.

The multi-stage filter-pressing membrane-breaking mercury purification device under normal temperature conditions of the utility model is explained with reference to the attached drawings. Referring to fig. 1, the utility model discloses a multistage filter-pressing rupture of membranes mercury purification device includes automatic flow operation and matter accuse electric part, multistage filtration purification part, gas-liquid pressure power part and gas-liquid storage part under the normal atmospheric temperature condition, wherein:

the automatic flow operation and quality control electrical part is used for on-off control, flow path conversion, operation sequence control, sensor data acquisition, subprogram skipping and identification and judgment on whether a quality control index critical condition is met or not of electrical elements such as a pump and an electromagnetic valve in the multistage filter-pressing membrane-breaking mercury purification device under the normal temperature condition so as to realize automatic operation of the treatment process of the device;

the multistage filtering and purifying part is used for performing graded fine filtering and purification on coarse mechanical impurities, fine dust after mercury soot breaking and a metal oxide film in the multistage filter-pressing membrane-breaking mercury purifying device under the normal temperature condition so as to obtain recyclable refined mercury which meets the quality standard requirement of a mercury pressing experiment;

the gas-liquid pressure power part is used for providing drive and pressure for flowing, circulating, membrane breaking, flushing and purifying of gas-liquid (nitrogen, deionized water and mercury) in the multistage filter-pressing membrane-breaking mercury purification device at normal temperature;

and the gas-liquid storage part is used for the substation storage of driving gas, purifying advanced crude mercury, stage-filtering mercury of a secondary filter and a tertiary filter, filtering qualified fine mercury, deionizing circulating water and process flushing sewage in the multistage filter-pressing membrane-breaking mercury purification device under the normal temperature condition.

Further, the automatic process operation and quality control electric part includes a nitrogen source inlet control solenoid valve 1 (normally closed type), a buffer tank outlet solenoid valve 2 (normally closed type), a gas-liquid vent solenoid valve 3 (normally closed type), a coarse mercury charging control solenoid valve 4 (normally closed type), a process isolation solenoid valve 5 (normally open type), a coarse mercury outlet solenoid valve 6 (normally open type), a prefilter column outlet solenoid valve 7 (normally open type), a filtration flushing bypass solenoid valve 8 (normally open type), a secondary filter isolation solenoid valve 9 (normally open type), a secondary filter flushing solenoid valve 10 (normally open type), a tertiary filter inlet solenoid valve 11 (normally open type), a tertiary filter top cleaning solenoid valve 12 (normally open type), a tertiary filter mercury outlet solenoid valve 13 (normally closed type), a light transmittance detection module 41, a detection tube top isolation solenoid valve 14 (normally closed type), a drug liquid pump outlet solenoid valve 15 (normally closed type), a deionized water circulation pump outlet solenoid valve 16 (normally closed type), a fine mercury control solenoid valve 17 (normally closed type), a deionized water return liquid inlet solenoid valve 18 (normally open type), a discharge circulation conversion solenoid valve 19 (normally open type), and an external discharge circulation conversion solenoid valve 20 (normally closed type); and control circuits and devices connected with the components, such as a PLC (programmable logic controller) electric automation control system (including PLC control software and the like) and a touch screen for displaying and operating.

The multi-stage filtration purification part comprises a pre-filtration column 21, a secondary filter 22 (a coarse mercury vibration screening filter), a tertiary filter 23 (a fine static filter or a precise filter), a deionized water circulation mercury removal filter 24 and a sewage discharge mercury removal filter 25.

The gas-liquid pressure power part comprises a sample injection pressurizing pump 26, a liquid medicine pump 27, a deionized water circulating pump 28 (preferably, the three pumps are all peristaltic pumps), a nitrogen generator 29, a vortex oscillator 30, an inlet pressure sensor 31, an intermediate pressure sensor 32 and an outlet pressure sensor 33.

The gas-liquid storage part comprises a low-pressure nitrogen buffer tank 34, a coarse mercury bottle 35, a fine mercury collecting bottle 36, a detection tube 37 (which is a quartz glass tube and is matched with a light transmittance detection module 41 to realize gas-water mercury detection), a purified liquid medicine bottle 38, a deionized water bottle 39 and an outlet sewage bottle 40.

In an embodiment, the utility model discloses a multistage filter-pressing rupture of membranes mercury purification device includes the pneumatic drive unit, thick mercury bottle 35, prefiltration post 21, secondary filter 22, tertiary filter 23 and the smart mercury receiving flask 36 that loop through pipe assembly and be connected under the normal atmospheric temperature condition.

The pneumatic driving unit is used for filling mercury to be filtered in the upper chambers of the secondary filter and the tertiary filter, pressurizing and filtering the lower chambers of the secondary filter and the tertiary filter and flushing a flow pipeline;

a coarse mercury bottle 35 for storing the coarse mercury to be treated or quantitatively storing the polluted mercury;

the pre-filtering column 21 is used for primary filtering of coarse mechanical impurities in coarse mercury or polluted mercury, and pollution and flow blockage to a secondary filter are reduced;

a secondary filter 22 for filtering fine dust impurities and realizing filter pressing and mechanical shock comprehensive membrane breaking of the mercury soot mixture;

the third-stage filter 23 is used for further fine filtration of the second-stage filtered mercury, oxidation film dissolution, reverse flushing circulation of deionized water buoyancy and other deep purification;

and the fine mercury collecting bottle 36 is used for collecting and storing fine mercury which reaches the mercury standard for mercury intrusion experiments after being sequentially and gradually purified by pre-filtering column filtering, secondary filter filtering, tertiary filter filtering, deionized water reverse buoyancy flushing and the like.

The air pressure driving unit comprises a nitrogen generator 29 and a nitrogen buffer tank 34, the output end of the nitrogen generator 29 is connected with the input end of the nitrogen buffer tank 34 through a nitrogen source electromagnetic valve 1, and an inlet pressure sensor 31 is arranged on a pipeline between the nitrogen source electromagnetic valve 1 and the nitrogen buffer tank 34; the output end of the nitrogen buffer tank 34 is connected with the input end of a coarse mercury bottle 35 through a buffer tank outlet electromagnetic valve 2; an external vent pipe is further arranged on the pipeline between the nitrogen buffer tank 34 and the crude mercury bottle 35 in a branching manner, and a gas-liquid vent electromagnetic valve 3 is arranged in the external vent pipe.

The input end of the thick mercury bottle 35 is further connected with a thick mercury feeding unit, the thick mercury feeding unit comprises a sample feeding pipe, the input end of the sample feeding pipe is used for being connected with an external thick mercury container for storing mercury to be purified, the output end of the sample feeding pipe is connected with a sample feeding pressurizing pump 26, and the output end of the sample feeding pressurizing pump 26 is connected with the feed inlet of the thick mercury bottle 35 through a thick mercury feeding electromagnetic valve 4.

The output end of the coarse mercury bottle 35 is connected with the input end of the pre-filter column 21 through a coarse mercury outlet electromagnetic valve 6. The output end of the pre-filter column 21 is connected with the input end of the secondary filter 22 through the pre-filter column outlet electromagnetic valve 7.

The secondary filter 22 is provided with a secondary upper cavity, a secondary filter pipe and a secondary lower cavity which are sequentially communicated from top to bottom, a discharge hole at the bottom of the secondary lower cavity is connected with the input end of the tertiary filter 23 through a tertiary filter inlet electromagnetic valve 11, and a middle pressure sensor 32 is arranged on a pipeline between the secondary filter 22 and the tertiary filter inlet electromagnetic valve 11.

The three-stage filter 23 is provided with a three-stage upper cavity, a three-stage filter pipe and a three-stage lower cavity which are sequentially communicated from top to bottom, and a discharge hole at the bottom of the three-stage lower cavity is sequentially connected with a fine mercury collecting bottle 36 through a three-stage filter mercury outlet electromagnetic valve 13 and a fine mercury filling control electromagnetic valve 17.

In another embodiment, the system further comprises a fine mercury standard-reaching detection unit, a deionized water washing unit, a dosing unit and a clean pollution discharge unit.

The fine mercury standard-reaching detection unit is used for detecting the cleanliness (light transmittance) of circulating liquid obtained after the fine mercury filtered by the three-stage filter is circularly flushed by deionized water so as to indirectly judge whether the mercury subjected to deep filtration treatment by the three-stage filter reaches the standard; if the flushing time does not reach the standard, further determining to continue circulating flushing; if the standard is reached, opening a fine mercury bottle filling valve to perform fine mercury filling;

the deionized water cleaning unit is used for pumping deionized water from a second outlet at the bottom chamber or the top chamber of the secondary filter or the tertiary filter by using a circulating pump, flushing, cleaning and unblocking filter screens and an upper chamber of the secondary filter and the tertiary filter, and guiding sewage into a sewage bottle through a sewage discharge pipeline;

the dosing unit is used for dissolving trace chemical agents in the filtered mercury which still has a metal oxide film after three-stage filtration (preferably physical filtration) so as to improve the purity of the mercury and ensure that the mercury is finally purified to reach the standard;

and the cleaning and sewage discharging unit is used for flushing and back flushing non-pure mercury substances such as impurity, dust and particles generated in the purification processes of pre-filtration, secondary filtration, tertiary filtration, reverse buoyancy circulating flushing and the like, and discharging the non-pure mercury substances into the sewage bottle, and then removing mercury through the mercury removal filter, so that the environment is protected and discharged after reaching the standard.

The accurate mercury detection unit up to standard includes the detection tube 37 and is arranged in detecting the luminousness of fluid luminousness among them and detects module 41, and the lower extreme of detection tube 37 is connected with the pipeline between tertiary filter mercury export solenoid valve 13 and the accurate mercury filling control solenoid valve 17.

The deionized water cleaning unit comprises a deionized water bottle 39, and the output end of the deionized water bottle 39 is connected with the upper end of the detection tube 37 through the deionized water circulating pump 28 and the outlet electromagnetic valve 16 of the deionized water circulating pump in sequence. An outlet pressure sensor 33 is provided on a line between the deionized water circulating pump outlet solenoid valve 16 and the detection pipe 37. The upper cavity of the third stage is connected with an upper outlet of a third stage filter, and is connected with an input end of a deionized water bottle 39 sequentially through a top cleaning electromagnetic valve 12 of the third stage filter, a deionized water circulating mercury removing filter 24 and a deionized water liquid returning inlet electromagnetic valve 18. The pipeline between the deionized water circulating pump outlet electromagnetic valve 16 and the detection pipe 37 is branched and connected with the pipeline between the three-stage filter top cleaning electromagnetic valve 12 and the deionized water circulating mercury removing filter 24 through the detection pipe top isolation electromagnetic valve 14.

The medicine adding unit comprises a purifying liquid medicine bottle 38, and the output end of the purifying liquid medicine bottle 38 is connected with the upper end of the detection tube 37 sequentially through a liquid medicine pump 27 and a liquid medicine pump outlet electromagnetic valve 15.

The cleaning and sewage discharging unit comprises an outlet sewage bottle 40, a branch pipe is branched on a pipeline between the flow isolating solenoid valve 5 and the coarse mercury outlet solenoid valve 6 and is connected with the input end of the outlet sewage bottle 40 through a secondary filter isolating solenoid valve 9. The output end of the outlet sewage bottle 40 is a sewage discharge pipe, and a sewage discharge mercury removal filter 25 and a sewage discharge electromagnetic valve 20 are arranged in the sewage discharge pipe. A branch pipe branches from the pipe between the flow isolation solenoid valve 5 and the secondary filter isolation solenoid valve 9 and is connected to the secondary filter 22 through the filtration flushing bypass solenoid valve 8. The secondary upper chamber of the secondary filter 22 has a drain outlet and is connected to the input of an outlet dirty water bottle 40 via a secondary filter flush solenoid valve 10. A branch pipe is branched from the pipeline between the top cleaning electromagnetic valve 12 of the three-stage filter and the deionized water circulating mercury removing filter 24 and is connected with the input end of the outlet sewage bottle 40 through a discharge circulating conversion electromagnetic valve 19.

The structure of the pre-filter column 21 of the present invention is shown in fig. 2, which comprises a pre-filter column outlet end cover 213, a pre-filter column filter tube 214 and a pre-filter column inlet end cover 215. The pre-filter column filter tube 214 is, for example, a double-threaded quartz glass tube, two ends of the pre-filter column filter tube are respectively connected to the pre-filter column outlet end cover 213 and the pre-filter column inlet end cover 215 in a threaded manner, and the three together form a space for accommodating a filter structure of the pre-filter column 21, and the filter structure includes two glass fiber portions 211 close to the pre-filter column outlet end cover 213 and the pre-filter column inlet end cover 215 and a quartz glass ball portion 212 located in the middle. Specifically, in a preferred embodiment, the filter structure is a filter layer sequentially packed in a sandwich structure along the filtering direction, i.e. a glass fiber part 211 (high temperature resistant glass fiber) with a front third thickness (length of the pre-filtering column filtering pipe 214), a quartz glass ball part 212 (e.g. 20 mesh quartz glass ball) with a middle third thickness and a glass fiber part 211 (high temperature resistant glass fiber) with a back third thickness, and the glass fiber part 211 and the quartz glass ball part 212 fill the space for accommodating the filter structure. The outlet end cover 213 of the pre-filter column and the inlet end cover 215 of the pre-filter column are both provided with a connector for connection, the connectors penetrate through the internal space and the external space of the pre-filter column 21, and the pre-filter column 21 is of a sealing structure except for the two connectors. During operation, coarse mercury enters the internal filter structure through the input end of the pre-filter column 21 (the interface of the inlet end cap 215 of the pre-filter column), passes through the three-layer structure of the filter structure layer by layer, and is finally discharged from the output end (the interface of the outlet end cap 213 of the pre-filter column), so as to realize the pre-filter process. The coarse mercury passes through the pre-filter column 21 to filter out most of the particle impurity components (which cannot pass through the gap between the glass fiber part 211 and the quartz glass ball part 212 and are blocked).

The utility model provides a secondary filter 22's structure is shown as figure 3A (assembly drawing) and figure 3B (sectional view), including second grade top spiral end cover 2201 that top-down connected gradually, second grade shake sieve friction chamber 2202, first O type sealing washer 2206, the first order screen cloth 2205 of secondary filter, the second grade shrinkage pipe 2203 (rely on the undergauge structure to realize the pressure boost acceleration rate), second O type sealing washer 2208, the second grade filter second filter screen cloth 2207 and the thick mercury of second grade receive chamber 2204 in the middle of the second grade.

The upper part of the second-stage top spiral end cover 2201 is a cover plate, a second-stage filter feeding hole 2209 and a second-stage filter sewage discharge port 2210 which are communicated are arranged on the cover plate side by side, and the second-stage filter feeding hole 2209 and the second-stage filter sewage discharge port 2210 are provided with interfaces for connection. The lower portion of the secondary top helical end cap 2201 is a cylindrical first connection section with external threads. Secondary top helical end cap 2201 is preferably polytetrafluoroethylene.

The upper section of the second-stage vibrating screen friction cavity 2202 is a cylindrical second connecting section with internal threads, and is connected with the first connecting section at the lower part of the second-stage top spiral end cover 2201 in a matching manner. The inner side of the middle section of the second-stage vibrating screen friction cavity 2202 is an inverted frustum-shaped through hole which is wide at the top and narrow at the bottom. The lower section of the second-stage vibrating screen friction cavity 2202 is a cylindrical third connecting section with external threads. The second-stage vibrating screen friction cavity 2202 is preferably made of polytetrafluoroethylene.

The second-stage intermediate reducing pipe 2203 is embedded in the third connecting section of the second-stage vibrating screen friction cavity 2202 in a matching manner, and the bottom end faces of the second-stage vibrating screen friction cavity and the third connecting section are flush. The inner side of the second-stage middle reducing pipe 2203 is an inverted truncated cone-shaped through hole with a wide upper part and a narrow lower part, and a first blocking shoulder is arranged at the opening of the through hole at the upper part. The secondary intermediate diameter reducer 2203 is preferably a metal or quartz glass tubing string and is replaceable.

The first O-ring 2206 (preferably made of silica gel) and the first-stage screen 2205 (preferably made of stainless steel or nylon, 40 mesh) of the second-stage filter are clamped and fixed between the bottom of the middle section of the second-stage vibrating screen friction cavity 2202 and the first blocking shoulder of the second-stage intermediate reducing pipe 2203.

The upper section of the secondary coarse mercury receiving cavity 2204 is a cylindrical fourth connecting section with internal threads, and is connected with the third connecting section of the secondary vibrating screen friction cavity 2202 in a matching manner. The lower section of the secondary coarse mercury receiving cavity 2204 is cylindrical with a bottom surface. A second shoulder is formed between the upper section and the lower section of the secondary coarse mercury-receiving cavity 2204. The secondary coarse mercury receiving cavity 2204 is preferably made of polytetrafluoroethylene.

A second O-ring 2208 (preferably made of silica gel) and a second-stage filtering screen 2207 (preferably made of stainless steel or nylon and 80-mesh) of the second-stage filter are clamped and fixed between the bottom of the third connecting section of the second-stage vibrating screen friction cavity 2202 and the second stop shoulder of the second-stage coarse mercury receiving cavity 2204.

A secondary filter discharge port 2211 is arranged at the bottom of the lower section of the secondary coarse mercury receiving cavity 2204, and the outward end of the secondary filter discharge port 2211 is a connector for connection.

In one embodiment, the secondary filter 22 is a fully detachable structure, and is integrally formed with a secondary upper cavity, a secondary filter tube and a secondary lower cavity which are sequentially communicated from top to bottom. The second-stage upper cavity is surrounded by a second-stage top spiral end cover 2201, a second-stage vibrating screen friction cavity 2202 and a second-stage filter first-stage screen 2205 and is in a shape formed by a cone, a cylinder and an inverted circular truncated cone from top to bottom. The secondary filter pipe consists of a secondary filter first-stage screen 2205, a secondary intermediate reducing pipe 2203 and a secondary filter screen 2207. The second-stage lower cavity is defined by a second-stage filtering screen 2207 of the second-stage filter and a second-stage coarse mercury receiving cavity 2204 and is in a shape formed by a cylinder and an inverted cone from top to bottom.

And referring to fig. 1, a vortex oscillator 30 is installed at a lower portion of the secondary filter 22 for oscillating it.

The operation and principle of the secondary filter 22 are as follows. Coarse mercury is pressed into a cavity at the upper part of the second stage, and a vibrating screen is used for friction rupture of membranes. And then, the pressure is continuously utilized to enable the coarse mercury to pass through a first-stage screen 2205 of the secondary filter and a second-stage filter screen 2207 of the secondary filter, filter pressing, friction and membrane breaking are carried out, meanwhile, the vortex oscillator 30 is utilized to carry out vortex oscillation operation, and during filter pressing and membrane breaking filtration, homogenization is fully oscillated so as to obtain a better membrane breaking and purifying effect. After being filtered by the secondary filter 22, the low-density coarse mercury rich in impurities and oxidation films is distributed on the upper part of a secondary filter screen 2207 of the secondary filter or is positioned in a cavity at the upper part of the secondary filter, and relatively pure high-density mercury mutually attracts, polymerizes and sinks on the bottom layer of an inverted cone at the bottommost part of a cavity at the lower part of the secondary filter, so that a primary gravity differentiation layering effect is formed.

The structure of the tertiary filter 23 in the present invention is as shown in fig. 4A (whole section view) and fig. 4B (partial enlarged view of the portion of the tertiary filter tube in fig. 4A), and includes a tertiary upper inlet seat 2302, a tertiary upper flange seat 2303, a tertiary filter tube, a tertiary lower flange seat 2306, and a tertiary lower outlet seat 2308, which are sequentially connected from top to bottom.

The third-stage upper inlet seat 2302 is in an inverted bowl shape, and a third-stage filter feed opening 2301 and a third-stage filter upper outlet 2321 which are communicated with each other are arranged at the upper part of the third-stage upper inlet seat 2302 and are provided with interfaces for connection. A third O-ring 2304 is disposed between the third-stage upper inlet seat 2302 and the third-stage upper flange seat 2303, for example, an annular receiving groove is formed in an upper surface of the third-stage upper flange seat 2303, the third O-ring 2304 is embedded in the receiving groove, and an upper side of the third O-ring 2304 is in contact with a lower surface of the third-stage upper inlet seat 2302. The tertiary upper inlet seats 2302 are bolted to the tertiary upper flange seats 2303, for example. The bottom of the third-stage upper flange seat 2303 is provided with a through hole and is communicated with the upper end of the third-stage filter pipe.

Tertiary lower part export seat 2308 is the bowl form, is provided with the tertiary filter discharge gate 2309 that has the interface in tertiary lower part export seat 2308's lower part, is provided with fourth O type sealing washer 2307 between tertiary lower part export seat 2308 and tertiary lower part flange seat 2306, and annular holding tank has been seted up on tertiary lower part export seat 2308 upper surface specifically for example, fourth O type sealing washer 2307 embedding sets up in this holding tank, and the top of fourth O type sealing washer 2307 is inconsistent with tertiary lower part flange seat 2306's lower surface. Third stage lower outlet seats 2308 are connected to third stage lower flange seats 2306, for example by bolts. The upper part of the third stage lower flange seat 2306 is provided with a through hole and communicated with the lower end of a third stage filter pipe in the form of a filter column.

A plurality of through holes which run through from top to bottom are correspondingly formed in the positions close to the edges of the three-level upper flange seat 2303 and the three-level lower flange seat 2306, so that the through holes penetrate through a plurality of double-end studs 2305, the two ends of each double-end stud 2305 are fixed by adopting matched nuts, and therefore the three-level filter pipe is clamped and fixed between the three-level upper flange seat 2303 and the three-level lower flange seat 2306. Further, the bottom of the third-stage upper flange seat 2303 and the top of the third-stage lower flange seat 2306 are both provided with a groove or a flange for positioning, and two ends of the third-stage filter pipe are respectively embedded into the groove or the flange, so that the fixing position of the third-stage filter pipe is ensured.

In a preferred embodiment, the third-stage filtering pipe comprises a third-stage hollow filtering column 2311 (preferably made of quartz glass) which is through from top to bottom. An annular groove is formed in the bottom of the third-stage upper flange seat 2303, the upper end of the third-stage hollow filter column 2311 is embedded into the annular groove, and an upper sealing ring 2310 (preferably a fluororubber sealing ring) is arranged between the third-stage hollow filter column and the third-stage hollow filter column; and an upper inner O-ring 2312 is clamped with the annular groove at the inner side of the upper end of the three-stage hollow filter column 2311.

A plurality of layers of three-stage filter screens 2320 are distributed in the three-stage hollow filter column 2311 along the length direction, for example, three layers are provided, and the three layers are respectively 100 meshes, 150 meshes and 250 meshes from top to bottom. The three-stage filter filtering net 2320 of each layer is clamped and fixed through a pressing ring 2313 and an inner column (preferably made of quartz glass), the pressing ring 2313 and the inner column are both in a hollow cylinder shape, the pressing ring 2313 is provided with a cylindrical wall in a protruding and extending mode at a position close to the inner side face, a blocking shoulder is formed at a position close to the outer side face, the inner column is provided with a cylindrical wall in a protruding and extending mode at a position close to the outer side face, and a blocking shoulder is formed at a position close to the inner side face, so that the two three-stage filter filtering nets 2320 are inserted in a convex-concave mode in a matched mode, and the three-stage filter filtering net 2320 is clamped in the middle. And, an O-ring 2318 of a bayonet portion is interposed between the outer side surface of the pressing ring 2313 and the inner side surface of the inner column. Specifically, for example, as shown in fig. 4B, the uppermost portion is a first extrusion ring in an inverted convex shape, the lower portion of the first extrusion ring is connected to the first inner column 2314 in a fitting manner, the upper portion of the first inner column 2314 is in a concave shape, the lower portion of the first inner column 2314 is in an inverted concave shape, the lower portion of the first inner column is connected to the second extrusion ring in a fitting manner, the lower portion of the second extrusion ring is a second inner column 2316 in an inverted concave shape, and the lowermost portion of the first extrusion ring is connected to the third extrusion ring in a convex shape; the three-layer three-stage filter net 2320 is fixed to be spaced apart by a predetermined distance. A gap portion O-ring 2315 is further provided between the outer side surface of each extrusion ring 2313 and/or inner column and the inner side surface of the three-stage hollow filter column 2311.

The top of tertiary lower flange seat 2306 is provided with annular flange to set up annular holding tank in the inboard face, the embedding has lower part O type sealing washer 2317 in this annular holding tank, and the lower extreme embedding of tertiary hollow filtration post 2311 is in the annular flange at tertiary lower flange seat 2306 top, and the side is inconsistent with lower part O type sealing washer 2317. A stainless steel mesh sheet 2319 (with a thickness of, for example, 1 mm) is further arranged between the bottom surface of the third-stage hollow filter column 2311 and the top surface of the third-stage lower flange seat 2306.

In one embodiment, the third-stage filter 23 is a fully detachable structure and is designed in a combined manner of an upper and a lower double-cone dumbbell-shaped structures, and after assembly, a third-stage upper cavity, a third-stage filter tube and a third-stage lower cavity which are sequentially communicated from top to bottom are integrally formed. The three-level upper cavity is enclosed by a three-level upper inlet seat 2302, a three-level upper flange seat 2303 and a three-level filter screen 2320 at the uppermost end of the three-level filter column, the three-level lower cavity is enclosed by a three-level filter screen 2320 at the lowermost end of the three-level filter column, a three-level lower flange seat 2306 and a three-level lower outlet seat 2308, and the three-level upper cavity and the three-level lower cavity are both double-cone dumbbell-shaped cavities (for example, a right cone, a cylinder and an inverted cone). The structure of the middle part connecting two double-cone dumbbell-shaped cavities is a three-stage filtering pipe of a reducing visual filtering pipe, the three-stage filtering pipe is provided with a series combination structure of three-stage filter filtering nets 2320 with multiple stages (preferably three or more stages) of different mesh numbers increasing progressively (preferably the filtering pore size is gradually reduced), so that mercury beads containing impurities or oxide films can be squeezed to deform and rub to break films by pressure, the re-polymerization effect is generated, the purpose is to break the mercury soot particles, adsorbed impurities and other aggregate surface adsorption films in crude mercury, and then pure mercury aggregate units and impurity water-containing light component systems after breaking films are respectively subjected to layer polymerization, and further mercury with higher purity and higher density and low density mixtures (such as mercury impurities, water and other metal oxide mixtures) are subjected to layer separation extraction purification and impurity removal.

The operation and principle of the three-stage filter 23 are as follows. Firstly, pressurizing a system flow path, so that the high-density polymerized filtered mercury in the second-stage lower cavity of the second-stage filter 22 is extruded into the third-stage upper cavity of the third-stage filter 23, and the mercury sequentially passes through the multi-layer third-stage filter filtering net 2320 step by step to perform gradually fine membrane breaking filtration. The mercury liquid of higher purity is finally filtered into the lower tertiary chamber of the tertiary filter 23, during which floating dust, metal oxide, more fine impurities and mercury soot coated particles in the crude mercury are retained on the tertiary filter screen 2320 by the fractional membrane rupture filtration.

In addition, a reverse circulation flushing technology of the buoyancy of the deionized water is adopted in the third-stage filter 23, the deionized water is reversely pumped into a third-stage lower cavity containing the filtered mercury in the third-stage filter 23 from a third-stage filter discharge hole 2309 at the bottommost part of the third-stage filter 23 by using a deionized water circulating pump 28, the deionized water can be freely reversely floated and flushed from the bottom of the third-stage lower cavity from bottom to top without pressure under the buoyancy effect generated by the huge density difference of the mercury in the water, a reverse convection purification effect is formed, and the filtered mercury is further purified.

Furthermore, according to the purification quality requirement of mercury in the tertiary filter 23 and the condition of oxidized impurities, the liquid medicine pump 27 fills a trace amount of purification liquid into the tertiary filter 23 to improve the purification effect. Thus, through the processes of multi-stage extrusion membrane-breaking filtration, reverse buoyancy circulating flushing, impurity removal, purification and purification of trace purification liquid medicine and the like, crude mercury or polluted mercury is purified step by step, and finally, refined mercury with purity meeting the requirement is obtained.

The utility model provides a luminousness detects module 41 and detecting tube 37's structure is shown in fig. 5, and detecting tube 37 is the vertical quartz glass pipe of placing, and both ends are equipped with interface 371 and detecting tube lower interface 372 on the detecting tube respectively. The light transmittance detection module 41 comprises a vertically arranged linear guide 4105, a detection tube upper end fixing support 4103 is fixedly arranged above the linear guide 4105, and a detection tube lower end fixing support 4104 is fixedly arranged below the linear guide 4105. The upper end fixing holder 4103 and the lower end fixing holder 4104 are fixed (for example, clamped) to the upper and lower ends of the detection tube 37. A detector mounting plate 4106 is slidably connected to the linear guide 4105, a light transmittance detector 4101 is mounted on the detector mounting plate 4106, and the detection position of the light transmittance detector 4101 faces the detection tube 37. Still including being used for driving the step motor 4102 that the detector installation splint 4106 reciprocated to can adjust the detection position of luminousness detector 4101 to high-order detection line U (be close to the detection tube 37 top) or low-order detection line D (be close to the detection tube 37 bottom), realize that gas water mercury three-phase detects.

The operation and principle of the transmittance detection module 41 and the detection tube 37 are as follows. A static gas-water-mercury three-phase detection state interface is established in the detection tube 37, the light transmittance detection module 41 is controlled and adjusted, the light transmittance detector 4101 is used for detecting the water phase cleanliness, namely the light transmittance, in the detection tube 37 at a reasonable detection state position, the deionized water phase light transmittance value when the mercury purity reaches the standard is used as an end condition for confirming that the purification of the circulating filtration mercury reaches the standard, the mercury purification at normal temperature reaches the standard and is recycled, and meanwhile, in the mercury purification process, the external sewage is subjected to mercury removal purification standard reaching treatment to meet the requirement of the environmental protection discharge standard.

On the other hand, luminousness detection module 41 still plays the effect of judging wherein smart mercury's volume at smart mercury filling in-process to control smart mercury filling control solenoid valve 17 and close when smart mercury is about to the earial drainage to finish, guarantee that the water of smart mercury top can not get into smart mercury receiving flask 36. The basic principle is that the light transmittance detection module 41 is adjusted to a low detection line D to emit detection light for detection, and if the mercury column completely shields the detection light, the light transmittance is basically 0; when the light transmittance is greater than 50, even close to 100, it indicates that the mercury-water interface is at or below the detection point, and this can be used as the condition for ending the filling action.

In addition, in the preferred embodiment, the volumes of the secondary upper cavity and the secondary lower cavity of the secondary filter 22 and the tertiary upper cavity and the tertiary lower cavity of the tertiary filter 23 are substantially equal to or slightly larger than the volume of the crude mercury added to the crude mercury bottle 35 in the primary purification process. Therefore, the crude mercury in the crude mercury bottle 35 is completely filtered to the second-level lower cavity and then completely filtered to the third-level lower cavity, the upper scale mark of the mercury does not exceed the height range of the second-level and third-level lower cavities, and the filtering process can be completed through the pressurization process and the volume-fixing process control. And when the mercury is pressed from the second-stage lower cavity to the third-stage upper cavity, even if the mercury in the third-stage upper cavity is not filtered through the third-stage filter pipe under pressure at the beginning, the mercury does not overflow from the upper outlet 2321 of the third-stage filter during the pressurization driving in the period, and only water, gas or impurity floating dust is extruded from the upper outlet 2321 of the third-stage filter and flows through the top cleaning electromagnetic valve 12 of the third-stage filter, the discharge circulation switching electromagnetic valve 19, the outlet sewage bottle 40, the sewage discharge mercury removal filter 25 and the sewage discharge electromagnetic valve 20 for discharge.

The volume of the detection tube 37 is preferably smaller than the volume of the crude mercury added into the crude mercury bottle 35, so that when the mercury outlet electromagnetic valve 13 of the three-stage filter is opened, the three-stage filter 23 and the detection tube 37 form a communicating vessel structure, the mercury water interface is kept consistent, and the mercury water interface in the lower cavity of the three stages cannot be greatly reduced due to the formation of the communicating vessel because the detection tube 37 is a small-volume thin tube. And, when the fine mercury is filled, mercury can be easily and rapidly discharged to the fine mercury collecting bottle 36 under the action of gravity, and it is required to ensure that the discharge process is not too rapid, otherwise, controllable filling and detection are not easy to realize. Therefore, the detection tube 37 adopts a small-volume thin tube, and the detection of the mercury-water interface level and the light transmittance of the aqueous solution in the detection tube 37 through the light transmittance detection module 41 is facilitated, so that controllable automatic filling can be realized.

The utility model provides a mercury filter 24 is removed in deionized water circulation, outer mercury filter 25 that removes of sewage can adopt the same structure remove the mercury filter, its structure is as shown in FIG. 6, including hollow mercury filter pipe 243 that removes (preferred double-ended screw thread quartz glass pipe), it 242 to have held mercury removal resin therein, mercury filter pipe 243 both ends set up mercury filter import end cover 241 and mercury filter export end cover 244 that removes respectively, mercury filter import end cover 241 and mercury filter export end cover 244 all are provided with the interface that link up, thereby can make waste water get into in the mercury filter pipe from the interface that removes mercury filter import end cover 241, purify through removing mercury resin 242, discharge from the interface that removes mercury filter export end cover 244 again. The mercury removal resin is also called ion exchange resin and is used for adsorbing mercury and heavy metals, CH-97 type renewable mercury removal resin is preferably adopted, and the mercury removal resin loaded with mercury after being used can be regenerated by mercury recovery enterprises and then put into use again. In the laboratory mercury purification process, CH-97 type mercury removal resin is filled in a quartz tube to remove and purify trace mercury, so that the environmental protection and safety can be ensured to reach the standard.

The utility model provides a part for controlling each component work preferably adopts PLC electric automation control system, has PLC control software to be connected with the touch-sensitive screen that is used for the operation. The control system realizes the manual operation and the automatic programming operation of 20 electromagnetic valves on a touch screen of a PLC (programmable logic controller) electrical automatic control system, realizes the start and stop control of one nitrogen generator 29, controls the programming and parameter acquisition of three pumps (comprising a sample injection pressurizing pump 26, a liquid medicine pump 27 and a deionized water circulating pump 28) according to the process requirements by utilizing PLC control software (preferably, PLC support software) in the system, and performs the program setting control and the detection data acquisition and storage of detection positions in three pressure sensors (comprising an inlet pressure sensor 31, a middle pressure sensor 32 and an outlet pressure sensor 33) and a light transmittance detection module 41. The PLC control software program is programmed according to the process flow sequence and the operation requirements, and the functions of automatically controlling the whole series of work flows from the pulsating pressure balance adjustment of the nitrogen generator 29, the mercury injection of the coarse mercury bottle 35, the mercury injection and filtration of the secondary filter 22, the mercury injection of the tertiary filter 23, the cleaning and circulating cleaning, the dosing, the recycling cleaning, the mercury cleanliness detection and the automatic sub-packaging of the refined mercury to the end are realized. The specific circuit structure, the program software and the like related to the PLC electrical automation control system are easy to realize based on the prior art, and are not described in detail herein.

The utility model discloses an among the multistage filter-pressing rupture of membranes mercury purification device under normal atmospheric temperature condition, except that device equipment and shutdown maintenance etc. need manual operation, following all steps all can be accomplished by PLC electrical automation control system is automatic, also can manually control. All the mentioned parameters can be input and set in the PLC electrical automation control system, only recommended values are given below, and the optimization and the adjustment can be specifically carried out according to actual conditions.

In another embodiment, a multistage filter-press membrane-breaking mercury purification device under normal temperature conditions is provided according to fig. 4A and 4B, and is a multistage visual filter that uses multistage filter-press membrane-breaking and deionized water buoyancy reverse circulation flushing and trace chemical reagent oxide impurity removal purification technologies, and experimental filtration conditions for specific crude mercury working conditions can be optimized by adopting mesh screen combinations with different mesh numbers in the filter, so that a mixed liquid phase system consisting of impurity oxides and dust particles contained in mercury with mercury purity of 99.5% or less can be filtered, membrane-breaking, purified and purified under normal temperature conditions. The multi-stage filter-pressing membrane-breaking mercury purification device under the normal temperature condition comprises an upper cavity, a middle part and a lower cavity which are connected in a combined mode, wherein the upper cavity and the lower cavity are of inner cavity structures which are identical in size and are conical at two ends of a middle cylinder, the middle part is a reducing multi-stage filtering visual tube, the whole structure is in a dumbbell shape vertically arranged from top to bottom, and waste mercury liquid enters from an inlet at the top end of the upper cavity and flows out from an outlet at the bottom of the lower cavity; the upper cavity body comprises a three-level upper inlet seat and a three-level upper flange seat which are hermetically connected up and down, the inner cavity of the three-level upper inlet seat is in an inverted cylindrical funnel shape, the inner cavity of the three-level upper flange seat is in a conical funnel shape, and the calibers of the inner cavities of the three-level upper inlet seat and the three-level upper flange seat are the same; the lower cavity comprises a third-level lower flange seat and a third-level lower outlet seat which are hermetically connected up and down, the inner cavity of the third-level lower flange seat is an inverted conical funnel, the inner cavity of the third-level lower outlet seat is in a cylindrical funnel shape, and the calibers of the inner cavities of the upper cavity and the lower cavity are the same; the middle part is a necking cylindrical quartz glass three-stage hollow filter column, and a plurality of homocircular filter screens with different holes are arranged in the middle part; the periphery of the filter screen is hermetically connected with a three-stage hollow filter column, and the three-stage hollow filter column is connected with the inner cavity of the upper and lower flange bases.

Preferably, the three-stage hollow filter column comprises a first inner column and a second inner column which are made of quartz glass materials, the first inner column and the second inner column are both in a hollow cylinder shape, the bottom area of the first inner column is the same as that of the second inner column, and the first inner column and the second inner column are in sealing connection through a flange and a sealing gasket; the first inner column is internally and hermetically connected with a first-stage filter screen and a second-stage filter screen which are in equal circles with the first inner column; the second inner column is internally and hermetically connected with a third-level filter screen which is in an equal circle with the second inner column and a stainless steel mesh sheet at the bottom; the top end of the first inner column is hermetically connected with the bottom end of the inner cavity of the three-level upper flange seat, the bottom end of the second inner column is connected with the top end of the inner cavity of the three-level lower flange seat, and all the joints are provided with sealing rings for sealing connection; the three-stage hollow filter column is respectively connected with the upper flange seat and the lower flange seat. The first inner column is provided with 100 meshes, a 160-mesh filter screen is arranged below the first inner column, and the second inner column is provided with a 200-mesh filter screen or other mesh combination schemes are optimally combined according to the requirement of filter precision. And extrusion rings are respectively arranged at the positions of the filter screens between the three-stage hollow filter columns and the inner column. The inlet end at the top of the inner cavity of the upper inlet seat at the third stage is connected with a quick connector for filling nitrogen; the outlet end of the bottom of the inner cavity of the third-level lower outlet seat is connected with a quick connector for connecting a deionized water pipe, the deionized water pipe is connected with a circulating pump, deionized water is pumped into the inner cavity of the third-level lower outlet seat, and the inner cavity of the device is repeatedly washed from bottom to top.

Further, in another preferred embodiment, the upper end and the lower end of the integral structure of the multistage filter-pressing membrane-breaking mercury purification device under normal temperature condition are designed by adopting a dumbbell-like structure, namely a cone and cylindrical cone combined inner cavity, the middle of the integral structure is connected by adopting a reducing hole multistage filter visible tube combination, and the structure is a dumbbell structure vertically arranged up and down; waste mercury liquid flows in from the top of the upper end and flows out from the outlet of the lower end, and the outlet of the lower end is connected with a deionized water pipe and a circulating pump; the multi-stage membrane breaking purification, the buoyancy reverse circulation flushing filtration and the layered extraction purification can be realized by controlling the gravity difference and the flow direction of the system pressure and the fluid with different densities in the process, so that the normal-temperature physical separation and purification function of a mercury-impurity oxide membrane-water ternary combination system is realized, and the advantages of environmental protection, safety and reliability are realized.

The upper end of the multistage filter-pressing membrane-breaking mercury purification device can be connected with a filter press or a pressure source to provide pressure input. The multi-stage filter-pressing membrane-breaking mercury purification device under the normal temperature condition comprises an upper cavity, a middle necking quartz tube and a lower cavity from top to bottom. The last cavity includes tertiary upper portion entry seat and tertiary upper portion flange seat, and tertiary upper portion entry seat inner chamber is for invering cylindrical funnel shape, and tertiary upper portion flange seat inner chamber is for the toper hourglass hopper-shaped, and both inner chamber bores are the same. The third-level upper inlet seat is positioned on the third-level upper flange seat, and the inner cavities of the third-level upper inlet seat and the third-level upper flange seat are butted. And a third O-shaped sealing ring larger than the inner cavity is arranged between the third-level upper inlet seat and the third-level upper flange seat, and the third O-shaped sealing ring are hermetically connected through screws and nuts. The inverted cone-shaped cylindrical design of the three-level upper inlet seat can reduce the adsorption of mercury beads and maximize the internal storage. The third-level upper inlet seat and the third-level upper flange seat form a compact shape, and the upper half part of the sealed mercury collecting cavity is formed. The toper design of tertiary upper portion flange seat, natural transition reduces inside mercury pearl and adsorbs, and the flange formula design can bear higher pressure, the harmless dismouting of being convenient for simultaneously. The lower cavity is the same as the volume of the upper cavity, the lower cavity comprises a third-level lower flange seat and a third-level lower outlet seat, the third-level lower flange seat is the same as the third-level upper flange seat in size and opposite in direction, the third-level lower outlet seat is the same as the third-level upper inlet seat in size and opposite in direction, the third-level lower flange seat is arranged on the third-level lower outlet seat, a fourth O-shaped sealing ring 7 larger than the inner cavity is arranged between the third-level lower outlet seat and the third-level lower outlet seat, and the third-level lower outlet seat are connected in a sealing mode through screws and nuts.

Stud bolts are symmetrically connected to two sides of the three-level upper flange seat and the three-level lower flange seat. The upper and lower joints are connected through nuts and screws. The middle quartz column is positioned in the double-ended stud. The three-level upper flange seat, the stud and the three-level lower flange seat form a compaction shape, the upper part and the lower part are extruded and sealed, the middle part is firmly fixed, and the whole device is integrated. The inlet end at the top of the inner cavity of the upper inlet seat at the third stage is connected with a quick connector, and high-purity nitrogen can be filled for generating protective gas inside the cavity; the outlet end of the bottom of the inner cavity of the third-level lower outlet seat is connected with a quick connector, the quick connector is connected with a deionized water pipe, the deionized water pipe is connected with a circulating pump, deionized water is pumped into the lower cavity through the quick connector, and floating and sinking and metal oxides in the crude mercury are washed from bottom to top, so that the further purification effect of the mercury is achieved. The quick-connection joint adopts a form of a quick-connection joint with one end being provided with threads and the other end being provided with threads, so that the whole quick-connection joint is convenient to assemble and disassemble with the outside; the quick-connection joint can be changed into a one-head thread one-head double quick-connection joint. The middle part, namely the middle quartz column, is a cylindrical quartz glass three-stage hollow filter column, the upper part is connected with the bottom end of the inner cavity of the flange seat at the upper part, and the lower part is connected with the top end of the inner cavity of the flange seat at the lower part. The middle part is provided with a circular three-stage filter screen vertical to the axial direction of the three-stage hollow filter column.

The middle part main part material is quartz glass, realizes visually, is convenient for observe the pollution state, in time washs or changes the filter screen. The cylindrical hollow first inner column and the cylindrical hollow second inner column which are made of quartz glass are sequentially arranged in the three-stage hollow filter column from top to bottom, the bottom areas of the first inner column and the second inner column are the same, and the first inner column and the second inner column are connected in a sealing mode through flanges, O-shaped sealing rings of the inserting parts and screws and nuts. The first inner column is internally provided with a first-stage filter screen and a second-stage filter screen which are vertical to the axial direction of the first inner column, the first-stage filter screen is positioned on the second-stage filter screen and has a certain distance relatively, the filter screens are circular, and the size of the filter screens is equal to the bottom area of the first inner column. Furthermore, all be equipped with in first interior post and the second with its axle direction perpendicular tertiary filter screen and stainless steel mesh sheet, the filter screen is circular, and its size equals with post bottom surface area in the second, and stainless steel mesh sheet is located post bottom in the second. The periphery of the filter screen and the mesh slice are hermetically connected with the inner column. Preferably, the first-stage filter screen is 100 meshes, the second-stage filter screen is 150 meshes, the third-stage filter screen is 200 meshes, and the filter screens can also be replaced by nylon screens. After certain pressure of filter pressing, the mercury liquid is filter-pressed step by step from top to bottom. More preferably, the three-stage filter screen forms three-stage filtration, which filters pollutant particles adsorbed in mercury liquid from large to small, and has a filtering and membrane breaking effect under certain pressure to overcome surface tension and filter aggregates with smaller primary particle size step by step. In a preferred embodiment, according to the purity standard, a multi-stage filtering screen combination design can be adopted, and the screen mesh combination and the control times of the screening cycle can be replaced and optimized according to the characteristics of the filtering fluid, so that the expected purification standard reaching the purity standard can be realized.

Extrusion rings are arranged between the three-level hollow filter column and the inner column at positions corresponding to the first-level filter screen, the second-level filter screen and the third-level filter screen. The damage of the inner column caused by the downward flow and extrusion of the mercury liquid is reduced. The top of the first inner column is connected with the bottom end of the inner cavity of the flange seat at the upper part of the third level, an O-shaped sealing ring at the inner side of the upper part is arranged between the connecting positions of the first inner column and the third inner column, the bottom of the second inner column is connected with the top end of the inner cavity of the flange seat at the lower part of the third level, and an O-shaped sealing ring at the lower part is arranged between the connecting positions. Realize the sealing connection and avoid the side leakage of the mercury liquid. The top of the three-level hollow filter column is connected with a three-level upper flange seat, an upper sealing ring is arranged between the top of the three-level hollow filter column and the three-level upper flange seat, the upper sealing ring is extruded and sealed, an O-shaped sealing ring on the inner side of the upper portion and the three-level upper flange seat are compressed, top sealing is formed, mercury can only penetrate out from a middle through hole, and side leakage cannot be generated. The bottom of the three-stage hollow filter column is connected with a three-stage lower flange seat, and a lower O-shaped sealing ring is arranged between the three-stage hollow filter column and the three-stage lower flange seat for extrusion sealing. Similarly, the lower O-shaped sealing ring and the three-level lower flange seat are tightly pressed to form top sealing, and mercury can only penetrate out of the middle through hole without side leakage.

The quartz column structure on both sides is more withstand voltage, reduces the damaged condition. The connecting ends of the two inner columns adopt a screw and nut detachable combined sealing structure, so that the disassembly, the cleaning, the part replacement and the repair are convenient; the flow system can realize the back flushing cleaning function under the condition of not being disassembled. The inlet and outlet quick assembly and disassembly structure can realize quick assembly, sealing and fault detection. The upper and lower two parts of main body material is polytetrafluoroethylene, and the sealing washer is the fluorine glue material, all does not produce chemical reaction with mercury.

According to the technical scheme, the functional structure performs multi-stage filter pressing, membrane breaking, flushing and purification in a specially designed closed cavity (a visible filter) according to the principle that mercury is a normal-temperature maximum-density liquid phase and has huge density difference with a mechanical impurity particle oxidation membrane and water. According to the principle of multi-phase system large-density differential layer extraction, the buoyancy reverse circulating flushing filtration and layered extraction purification effects of the mercury-impurity oxidation film-water ternary combination system are realized, the normal-temperature physical purification of mercury is realized, and the advantages of environmental protection, safety and reliability are achieved.

To sum up, the utility model discloses a multistage filter-pressing rupture of membranes mercury purification device and method mainly have following useful technique under the normal atmospheric temperature condition:

1. the scheme of the utility model improves the purity of the crude mercury step by step through the multi-stage filter-pressing membrane-breaking deionized water buoyancy reverse circulation purification technology under the normal temperature condition, and finally reaches more than 99.9 percent, so that the purity of the purified mercury meets the mercury purity specified by the laboratory mercury pressure method capillary pressure curve experimental standard GB/T2650.1-2008; high-temperature vacuum distillation or chemical-electrochemical treatment of the traditional mercury purification method is not adopted, so that the problems that high-temperature virulent mercury vapor or secondary dangerous waste is generated and the application scene of small-scale mercury purification is not suitable are solved; meanwhile, the technical problems of regeneration treatment for purifying pollutants and mercury removal and standard discharge of discharged sewage are solved, and a brand new technical path is opened up for purification treatment and reutilization of laboratory-scale crude mercury.

2. The utility model has reliable performance, safety, environmental protection and high environmental applicability, can realize the on-site timely environmental protection treatment by a mercury laboratory, and reduces the risk of secondary pollution diffusion and transfer; and the absolute amount of mercury in a laboratory can be reduced, the recycling is promoted, and the method has good economic benefit, environmental protection social benefit and meets the requirement of environmental protection policy encouragement.

3. The coarse mercury vibrating screen secondary filter and the three-level fine filter developed and designed by the scheme of the utility model have the upper and lower ends adopting the design of a cone-like body and a cylinder combined inner cavity, the middle part adopting a reducing hole form to be combined and connected with a secondary or three-level filter pipe, and the structure is a dumbbell-shaped structure with the upper and lower ends being wide and the middle part being thin, and the secondary filter can realize the vibrating screen friction and the acceleration effect of a constant flow variable cross section tubule and the front and back pressure difference expansion effect of a venturi narrow pipe throttling interface to enhance the friction mixing filtering effect; the three-stage filter structure design not only utilizes the Venturi tube effect, but also adopts three layers of screens for gradually reducing meshes (namely increasing the mesh number of the screens), so that more tiny variable flow cross section mesh effects are formed, and microsphere particle high-interface tension microsphere liquid drops containing dust and oxide films are further extruded and deformed and frictionally deformed when passing through mesh holes, so that the filtering effect is further improved.

5. The utility model discloses a scheme utilizes heterogeneous system heavy density difference layer extraction principle to realize that the reverse circulation of buoyancy of mercury-impurity oxide film-water ternary combination system washes filtration and layering extraction purification effect, has realized the normal atmospheric temperature physics of mercury and has the advantage of environmental protection safe and reliable.

6. The utility model discloses a scheme adopts PLC programming, and multiple intelligent technologies such as synchronous touch-sensitive screen flow, automatic matter accuse detect, outer row remove mercury purification are miniature to integrate and are made, have realized under the normal atmospheric temperature condition, the place occupies the minimizing, outer waste liquid environmental protection standardization, uses the diversified target of scene.

Above all embodiments only are used for explaining the technical scheme of the utility model patent, rather than limiting it, based on the embodiment of the utility model patent, all other expansion embodiments that ordinary skilled person in the art obtained under the prerequisite of not making implementation utility model novelty work all belong to the protection scope of the utility model patent. Although the present invention has been described in detail with reference to the foregoing examples, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a prefiltration post, it is applicable to multistage filter-pressing rupture of membranes mercury purification device under normal atmospheric temperature condition, a serial communication port, it includes prefiltration post outlet end cover, prefiltration post filter tube and prefiltration post inlet end cover, prefiltration post filter tube is double-end screw thread quartz glass pipe, prefiltration post filter tube both ends are connected prefiltration post outlet end cover and prefiltration post inlet end cover respectively through the screw thread mode, prefiltration post outlet end cover, prefiltration post filter tube and prefiltration post inlet end cover enclose into the space that is used for holding the filtration of prefiltration post jointly.

2. The pre-filter column of claim 1, wherein the filter structure of the pre-filter column comprises two fiberglass sections adjacent to the outlet end cap of the pre-filter column and the inlet end cap of the pre-filter column and a quartz glass bulb section in the middle.

3. The pre-filter column of claim 1, wherein the pre-filter structure is a filter layer sequentially packed in a sandwich structure along the filtering direction, i.e., a front glass fiber part having a length of one third of the length of the filter tube of the pre-filter column, a middle quartz glass ball part having a length of one third of the length of the filter tube of the pre-filter column, and a rear glass fiber part having a length of one third of the length of the filter tube of the pre-filter column.

4. The pre-filter column according to claim 1, wherein the pre-filter column outlet end cap and the pre-filter column inlet end cap are provided with connectors for connection, and the connectors penetrate through the inner space and the outer space of the pre-filter column.

5. The pre-filter column according to claim 4, wherein the multi-stage filter-pressing membrane-breaking mercury purification device at normal temperature suitable for the pre-filter column comprises an air pressure driving unit, a coarse mercury bottle, the pre-filter column, a secondary filter, a tertiary filter and a fine mercury collecting bottle which are sequentially connected through a pipeline assembly;

the crude mercury bottle is used for storing the crude mercury to be treated or quantitatively storing the polluted mercury;

the pre-filtering column is used for primary filtering of coarse mechanical impurities in coarse mercury or polluted mercury, and reduces pollution and flow blockage to the secondary filter;

the secondary filter is used for filtering fine dust impurities and realizing filter pressing and mechanical shock comprehensive membrane breaking of the mercury soot mixture;

the three-stage filter is used for further fine filtration of the second-stage filtered mercury, oxidation film dissolution, reverse flushing circulation of deionized water buoyancy and other deep purification;

the fine mercury collecting bottle is used for collecting and storing fine mercury which reaches mercury standard for mercury pressing experiments after being sequentially and gradually purified through pre-filtering column filtering, secondary filter filtering, tertiary filter filtering, deionized water reverse buoyancy flushing and the like.

6. The pre-filter column of claim 5, wherein the pneumatic driving unit comprises a nitrogen generator and a nitrogen buffer tank, the output end of the nitrogen generator is connected with the input end of the nitrogen buffer tank through a nitrogen source solenoid valve, and an inlet pressure sensor is arranged on a pipeline between the nitrogen source solenoid valve and the nitrogen buffer tank; the output end of the nitrogen buffer tank is connected with the input end of the thick mercury bottle through an electromagnetic valve at the outlet of the buffer tank; an external vent pipe is further arranged on the pipeline between the nitrogen buffer tank and the crude mercury bottle in a branching manner, and a gas-liquid vent electromagnetic valve is arranged in the external vent pipe.

7. The pre-filter column according to claim 6, wherein the input end of the crude mercury bottle is further connected with a crude mercury feeding unit, the crude mercury feeding unit comprises a sample feeding pipe, the input end of the sample feeding pipe is used for being connected with an external crude mercury container for storing mercury to be purified, the output end of the sample feeding pipe is connected with a sample feeding pressurizing pump, and the output end of the sample feeding pressurizing pump is connected with the feed inlet of the crude mercury bottle through a crude mercury feeding electromagnetic valve.

8. The pre-filter column of claim 7, wherein the output end of the coarse mercury bottle is connected with the input end of the pre-filter column through a coarse mercury outlet solenoid valve, and the output end of the pre-filter column is connected with the input end of the secondary filter through a pre-filter column outlet solenoid valve.

9. The pre-filter column of claim 7, wherein the secondary filter comprises a secondary upper cavity, a secondary filter tube and a secondary lower cavity which are sequentially communicated from top to bottom, a discharge port at the bottom of the secondary lower cavity is connected with the input end of the tertiary filter through a tertiary filter inlet solenoid valve, and an intermediate pressure sensor is further arranged on a pipeline between the secondary filter and the tertiary filter inlet solenoid valve.

10. The pre-filtering column according to claim 7, wherein the tertiary filter comprises a tertiary upper cavity, a tertiary filtering pipe and a tertiary lower cavity which are sequentially communicated from top to bottom, and a discharge hole at the bottom of the tertiary lower cavity is sequentially connected with the fine mercury collecting bottle through a mercury outlet electromagnetic valve and a fine mercury filling control electromagnetic valve of the tertiary filter.