CN107715821A - A kind of chemical industry is efficiently without residue solid-liquid reaction device - Google Patents

A kind of chemical industry is efficiently without residue solid-liquid reaction device Download PDF

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Publication number
CN107715821A
CN107715821A CN201711019520.7A CN201711019520A CN107715821A CN 107715821 A CN107715821 A CN 107715821A CN 201711019520 A CN201711019520 A CN 201711019520A CN 107715821 A CN107715821 A CN 107715821A
Authority
CN
China
Prior art keywords
casing
chemical industry
efficiently
reaction
reaction device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201711019520.7A
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Chinese (zh)
Inventor
王大海
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangbei District In Ningbo Yirenbao Trading Co Ltd
Original Assignee
Jiangbei District In Ningbo Yirenbao Trading Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangbei District In Ningbo Yirenbao Trading Co Ltd filed Critical Jiangbei District In Ningbo Yirenbao Trading Co Ltd
Priority to CN201711019520.7A priority Critical patent/CN107715821A/en
Publication of CN107715821A publication Critical patent/CN107715821A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/18Stationary reactors having moving elements inside
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D35/00Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/02Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/0053Details of the reactor
    • B01J19/0066Stirrers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J4/00Feed or outlet devices; Feed or outlet control devices
    • B01J4/008Feed or outlet control devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V33/00Structural combinations of lighting devices with other articles, not otherwise provided for
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00049Controlling or regulating processes
    • B01J2219/00051Controlling the temperature
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00049Controlling or regulating processes
    • B01J2219/00177Controlling or regulating processes controlling the pH
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00049Controlling or regulating processes
    • B01J2219/00182Controlling or regulating processes controlling the level of reactants in the reactor vessel

Abstract

The invention discloses a kind of chemical industry efficiently without residue solid-liquid reaction device, including guide wheel, rotating shaft, casing, discharging tube, heater, water inlet pipe, fluid flowmeter, camera, air bag, gauze pocket, gas cleaning plant and overflow pipe, described tank floor is provided with guide wheel, heater is provided with casing, wall box is provided with thermometer and PH detectors, water inlet pipe connects with casing top, fluid flowmeter is installed on water inlet pipe, casing top is provided with liquid level gauge and timer, air bag is provided with casing, it is connected below air bag by lifting rope with gauze pocket, rotating shaft is provided with casing, impeller is installed in rotating shaft, casing top inwall is provided with camera, casing top connects with appendix, the appendix other end connects with gas cleaning plant, casing bottom is provided with discharging tube.Present invention increase reaction contact area, improves reaction rate, while avoids unreacted solid residue from entering in reaction solution, is convenient to clean simultaneously, simple in construction, easy to use, beneficial to popularization.

Description

A kind of chemical industry is efficiently without residue solid-liquid reaction device
Technical field
The present invention relates to a kind of chemical industry equipment, specifically a kind of chemical industry is efficiently without residue solid-liquid reaction device.
Background technology
The relation of the mankind and chemical industry is very close, spreads to the every aspect of life.In the modern life, almost at any time with Ground all be unable to do without chemical products, from material lifes such as clothing, food, shelter, rows to culture and arts, the cultural life such as amusement, being required for Chemical product services for it.Some chemical products play epoch-making important function in human development history.Their production and Using, or even represent certain historical stage of human civilization.The mankind constantly make to try to achieve survival and development with the Nature Struggle, deepened the understanding to world around step by step, so as to grasped conquer nature, the ability of reforming world.By very long Historical practice, the mankind excel at leveraging all the more natural conditions, and oneself to create the abundant material world.Due to natural goods The proper property of matter can not meet people's needs, and just generates various process technologies, natural materials are transformed into a variety of The novel substance of performance, and progressively put into effect in industrial scale.Solid-liquid reaction is wherein important in chemical industry equipment A part.Residue can be usually produced during solid-liquid reaction, influences the quality of reactant, while easily blocks pipeline, cleaning is difficult. Solid is typically deposited in bottom simultaneously, and few with the contact area of liquid, reaction efficiency is low.
The content of the invention
It is an object of the invention to provide a kind of chemical industry efficiently without residue solid-liquid reaction device, to solve above-mentioned background technology The problem of middle proposition.
To achieve the above object, the present invention provides following technical scheme:
A kind of chemical industry is efficiently without residue solid-liquid reaction device, including guide wheel, rotating shaft, casing, discharging tube, heater, water inlet pipe, liquid Flowmeter body, camera, air bag, gauze pocket, gas cleaning plant and overflow pipe, described tank floor are provided with guide wheel, casing Interior to be provided with heater, wall box is provided with thermometer and PH detectors, stirring motor, stirring motor peripheral hardware is provided with casing There is anti-sump, stirring motor output shaft and stirring axis connection, the winding of agitating shaft outer wall set helical blade, install and stir on agitating shaft Impeller is mixed, agitator arm is provided with auxiliary agitating plate, spine, water inlet pipe and case are designed with agitator arm edge and cabinet wall Body top is connected, and fluid flowmeter is installed on water inlet pipe, and casing top is provided with liquid level gauge and timer, air bag is provided with casing, It is connected below air bag by lifting rope with gauze pocket, air bag is connected by appendix with inflation means of deflation, and wall box is provided with medicine Agent adding tube, medicament adding tube are provided with scale, and catalyst tank is detachably provided with casing, illuminating lamp, casing are installed in casing Top inwall is provided with camera, and casing top connects with appendix, and the appendix other end connects with gas cleaning plant, casing bottom End is provided with discharging tube, and overflow pipe one end connects with casing top, and the overflow pipe other end connects with discharging tube.
As the further scheme of the present invention:Described guide wheel is provided with parking brake.
As further scheme of the invention:It is flat where plane and agitator arm where described auxiliary agitating plate Face is mutually perpendicular to.
As further scheme of the invention:The described gauze pocket beginning is provided with bungee, is provided with inside gauze pocket more Layer interlayer net.
As further scheme of the invention:Through hole is uniformly provided with described catalyst tank side wall.
As further scheme of the invention:Described camera is connected with external display device.
As further scheme of the invention:Described discharging tube is provided with filter screen with casing junction.
Compared with prior art, the beneficial effects of the invention are as follows:Guide wheel of the present invention facilitates device to move, time saving and energy saving, adds Hot device ensures the most desirable temperature of reaction, and thermometer measures case body temperature at any time, and PH detectors measure reaction solution in casing Acid-base property, ensure suitable reaction environment, fluid flowmeter record enters the amount of reaction liquid in casing, and liquid level gauge measures at any time The amount of reaction solution in casing, convenient supplement in time, timer record simultaneously are used for controlling the reaction time, ensure the accurate of the extent of reaction Property, convenient operation carries out being stirred up and down by stirring motor to reaction, there is provided reaction solution and solid reactant Contact and impact, there is provided reaction efficiency and effect, while caused bubble is punctured by spine, beneficial to its reaction, pass through medicament Adding tube physical examination suitable excipients, ensure the progress of reaction, and catalyst tank facilitates the progress of chemical reaction, shone built with catalyst Bright lamp provides illumination for some special reactions, while the response situation conveniently checked in casing, and reaction solid is placed on into gauze In pocket, by being inflated to air bag, change the overall buoyancy of reaction solid and air bag, reaction solid is suspended in reaction solution Rolling, increase reaction contact area, improve reaction rate, while avoid unreacted solid residue from entering in reaction solution, simultaneously It is convenient to clean, sees the response situation in casing clearly in time by camera, gas cleaning plant is collected and purified caused by reaction Gas, avoid it from being directly discharged in air, cause environmental pollution, filter screen avoids impurity from blocking pipeline, and overflow pipe avoids reacting Liquid excessively influences to react, simple in construction, easy to use, beneficial to popularization.
Brief description of the drawings
Fig. 1 is a kind of structural representation of chemical industry efficiently without residue solid-liquid reaction device.
Fig. 2 is a kind of structural representation of chemical industry efficiently without agitator arm in residue solid-liquid reaction device.
Fig. 3 is a kind of structural representation of chemical industry efficiently without gauze pocket in residue solid-liquid reaction device.
In figure:1st, guide wheel, 2, anti-sump, 3, stirring motor, 4, casing, 5, discharging tube, 6, filter screen, 7, heater, 8, temperature Degree meter, 9, PH detectors, 10, water inlet pipe, 11, fluid flowmeter, 12, liquid level gauge, 13, timer, 14, camera, 15, gas Capsule, 16, gauze pocket, 17, appendix, 18, gas cleaning plant, 19, overflow pipe, 20, agitating shaft, 21, helical blade, 22, stir Mix impeller, 23, auxiliary agitating plate, 24, spine, 25, medicament adding tube, 26, appendix, 27, inflation means of deflation, 28, catalysis Agent tank, 29, illuminating lamp, 30, bungee, 31, interlayer net.
Embodiment
The technical scheme of this patent is described in more detail with reference to embodiment.
Fig. 1-3 are referred to, a kind of chemical industry is efficiently without residue solid-liquid reaction device, including guide wheel 1, rotating shaft 2, casing 4, discharge opeing Pipe 5, heater 7, water inlet pipe 10, fluid flowmeter 11, camera 14, air bag 15, gauze pocket 16, gas cleaning plant 18 and overflow Flow tube 19, the described bottom surface of casing 4 are provided with guide wheel 1, and guide wheel 1 is provided with parking brake, and guide wheel 1 facilitates device to move, time saving and energy saving, case Heater 7 is provided with body 4, the side wall of casing 4 is provided with thermometer 8 and PH detectors 9, and heater 7 ensures the most suitable of reaction Temperature, thermometer 8 measure temperature in casing 4 at any time, and PH detectors 9 measure the acid-base property of reaction solution in casing 4, and it is suitable to ensure Reaction environment, casing 4 is interior to be provided with stirring motor 3, and stirring motor 3 is externally provided with anti-sump 2, and anti-sump 2 avoids external reaction liquid pair The influence of stirring motor 3, the output shaft of stirring motor 3 are connected with agitating shaft 20, and the winding of the outer wall of agitating shaft 20 sets helical blade 21, agitator arm 22 is installed, agitator arm 22 is provided with auxiliary agitating plate 23, flat where auxiliary agitating plate 23 on agitating shaft 20 Face is mutually perpendicular to the plane where agitator arm 22, is designed with spine 24 on the edge of agitator arm 22 and the inwall of casing 4, is passed through Stirring motor 3 carries out being stirred up and down to reaction, there is provided contact and impact of the reaction solution with solid reactant, there is provided Reaction efficiency and effect, while caused bubble is punctured by spine 24, beneficial to its reaction, water inlet pipe 10 connects with the top of casing 4 It is logical, fluid flowmeter 11 is installed, the record of fluid flowmeter 11 enters the amount of reaction liquid in casing 4, and casing 4 pushes up on water inlet pipe 10 End is provided with liquid level gauge 12 and timer 13, and liquid level gauge 12 measures the amount of reaction solution in casing 4, convenient supplement in time, timing at any time Device 13 records and for controlling the reaction time, ensures the accuracy of the extent of reaction, convenient operation, casing 4 is interior to be provided with air bag 15, gas The lower section of capsule 15 is connected by lifting rope with gauze pocket 16, and air bag 15 is connected by appendix 26 with inflation means of deflation 27, gauze pocket 16 beginnings were provided with bungee 30, and the inside of gauze pocket 16 is provided with multilayer interlayer net 31, and reaction solid is placed into layering respectively is placed on yarn In on interlayer net 31 in pocket 16, by being inflated to air bag 15, change the overall buoyancy of reaction solid and air bag 15, make Reaction solid suspends rolling in reaction solution, increase reaction contact area, raising reaction rate, and the side wall of casing 4 adds provided with medicament Add pipe 25, medicament adding tube 25 is provided with scale, by the physical examination suitable excipients of medicament adding tube 25, ensures the progress of reaction, case Catalyst tank 28 detachably is provided with body 4, is uniformly provided with through hole in the side wall of catalyst tank 28, catalyst tank 28 is built with catalysis Agent, facilitates the progress of chemical reaction, and install the illuminating lamp 29 of illuminating lamp 29. in casing 4 provides illumination for some special reactions, together When the response situation conveniently checked in casing 4, the top inwall of casing 4 is provided with camera 14, camera 14 and external display device Connection, sees the response situation in casing 4 clearly, the top of casing 4 connects with appendix 17, and appendix 17 is another in time by camera 14 One end connects with gas cleaning plant 18, gas cleaning plant 18 collect and purify reaction caused by gas, avoid it from directly arranging It is put into air, causes environmental pollution, the bottom of casing 4 is provided with discharging tube 5, and discharging tube 5 is provided with filter screen 6 with the junction of casing 4, filters Net 6 avoids impurity from blocking pipeline, and the one end of overflow pipe 19 connects with the top of casing 4, and the other end of overflow pipe 19 connects with discharging tube 5, Overflow pipe 19 avoids reaction solution from excessively influenceing to react.
The present invention operation principle be:Guide wheel of the present invention facilitates device to move, time saving and energy saving, and heater ensures reaction most Suitable temperature, thermometer measure case body temperature at any time, and PH detectors measure the acid-base property of reaction solution in casing, and it is suitable to ensure Reaction environment, fluid flowmeter record enter the amount of reaction liquid in casing, and liquid level gauge measures the amount of reaction solution in casing at any time, Convenient supplement in time, timer record simultaneously are used for controlling the reaction time, ensure the accuracy of the extent of reaction, convenient operation, pass through Stirring motor carries out being stirred up and down to reaction, there is provided contact and impact of the reaction solution with solid reactant, there is provided Reaction efficiency and effect, while caused bubble is punctured by spine, it is properly auxiliary by the physical examination of medicament adding tube beneficial to its reaction Material, ensures the progress of reaction, and catalyst tank facilitates the progress of chemical reaction, illuminating lamp is that some are special anti-built with catalyst Illumination should be provided, while the response situation conveniently checked in casing, reaction solid is placed in gauze pocket, by entering to air bag Row inflation, change the overall buoyancy of reaction solid and air bag, reaction solid is suspended in reaction solution rolling, increase, which is reacted, to be contacted Area, reaction rate is improved, while avoid unreacted solid residue from entering in reaction solution, be convenient to clean simultaneously, pass through shooting Head sees response situation in casing clearly in time, gas cleaning plant collects and purify react caused by gas, avoid it from directly arranging It is put into air, causes environmental pollution, filter screen avoids impurity from blocking pipeline, and overflow pipe avoids reaction solution from excessively influenceing to react.
The better embodiment of this patent is explained in detail above, but this patent is not limited to above-mentioned embodiment party Formula, can also be on the premise of this patent objective not be departed from one skilled in the relevant art's possessed knowledge Make a variety of changes.

Claims (7)

1. a kind of chemical industry is efficiently without residue solid-liquid reaction device, including guide wheel, rotating shaft, casing, discharging tube, heater, water inlet pipe, Fluid flowmeter, camera, air bag, gauze pocket, gas cleaning plant and overflow pipe, it is characterised in that described tank floor Provided with guide wheel, heater is provided with casing, wall box is provided with thermometer and PH detectors, stirring electricity is provided with casing Machine, stirring motor are externally provided with anti-sump, and stirring motor output shaft and stirring axis connection, the winding of agitating shaft outer wall set helical-blade Piece, agitator arm is installed on agitating shaft, and agitator arm is provided with auxiliary agitating plate, all set on agitator arm edge and cabinet wall There is spine, water inlet pipe is connected with casing top, and fluid flowmeter is installed on water inlet pipe, and casing top is provided with liquid level gauge and timing Device, casing is interior to be provided with air bag, is connected below air bag by lifting rope with gauze pocket, and air bag passes through appendix and connected with inflation means of deflation Logical, wall box is provided with medicament adding tube, and medicament adding tube is provided with scale, detachably catalyst tank, casing are provided with casing Interior installation illuminating lamp, casing top inwall are provided with camera, and casing top connects with appendix, the appendix other end and gas Purifier connects, and casing bottom is provided with discharging tube, and overflow pipe one end connects with casing top, the overflow pipe other end and discharging tube Connection.
2. a kind of chemical industry according to claim 1 is efficiently without residue solid-liquid reaction device, it is characterised in that described guide wheel It is provided with parking brake.
3. a kind of chemical industry according to claim 1 is efficiently without residue solid-liquid reaction device, it is characterised in that described auxiliary The plane where plane and agitator arm where agitating plate is mutually perpendicular to.
4. a kind of chemical industry according to claim 1 is efficiently without residue solid-liquid reaction device, it is characterised in that described gauze The pocket beginning is provided with bungee, and multilayer interlayer net is provided with inside gauze pocket.
5. a kind of chemical industry according to claim 1 is efficiently without residue solid-liquid reaction device, it is characterised in that described catalysis Through hole is uniformly provided with agent pot sidewall.
6. a kind of chemical industry according to claim 1 is efficiently without residue solid-liquid reaction device, it is characterised in that described shooting Head is connected with external display device.
7. a kind of chemical industry according to claim 1 is efficiently without residue solid-liquid reaction device, it is characterised in that described discharge opeing Pipe is provided with filter screen with casing junction.
CN201711019520.7A 2017-10-27 2017-10-27 A kind of chemical industry is efficiently without residue solid-liquid reaction device Pending CN107715821A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711019520.7A CN107715821A (en) 2017-10-27 2017-10-27 A kind of chemical industry is efficiently without residue solid-liquid reaction device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711019520.7A CN107715821A (en) 2017-10-27 2017-10-27 A kind of chemical industry is efficiently without residue solid-liquid reaction device

Publications (1)

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CN107715821A true CN107715821A (en) 2018-02-23

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109052773A (en) * 2018-10-30 2018-12-21 贵州兴贵环保工程有限公司 Energy saving light catalytic waste water processing device
CN110433744A (en) * 2019-07-30 2019-11-12 广州珠江光电新材料有限公司 Fluorescent powder preparation facilities and preparation method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205340511U (en) * 2016-01-05 2016-06-29 江西中鼎金属工艺有限公司 Novel complete set colloidal sol electric dry oven
CN105771813A (en) * 2016-03-07 2016-07-20 姚莲琴 Solid-liquid reaction device with no residues
CN107126919A (en) * 2017-07-13 2017-09-05 徐继传 One kind energy-conservation separation of solid and liquid security reaction kettle
CN206529368U (en) * 2017-03-07 2017-09-29 张小莎 A kind of high efficiency photocatalysis sewage disposal sterilizing equipment decontaminating apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205340511U (en) * 2016-01-05 2016-06-29 江西中鼎金属工艺有限公司 Novel complete set colloidal sol electric dry oven
CN105771813A (en) * 2016-03-07 2016-07-20 姚莲琴 Solid-liquid reaction device with no residues
CN206529368U (en) * 2017-03-07 2017-09-29 张小莎 A kind of high efficiency photocatalysis sewage disposal sterilizing equipment decontaminating apparatus
CN107126919A (en) * 2017-07-13 2017-09-05 徐继传 One kind energy-conservation separation of solid and liquid security reaction kettle

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109052773A (en) * 2018-10-30 2018-12-21 贵州兴贵环保工程有限公司 Energy saving light catalytic waste water processing device
CN109052773B (en) * 2018-10-30 2021-09-07 山东家佳嘉环保科技有限公司 Energy-saving photocatalytic sewage treatment device
CN110433744A (en) * 2019-07-30 2019-11-12 广州珠江光电新材料有限公司 Fluorescent powder preparation facilities and preparation method

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Application publication date: 20180223

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