CN217121223U - Resourceful treatment system of industry waste salt - Google Patents
Resourceful treatment system of industry waste salt Download PDFInfo
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- CN217121223U CN217121223U CN202123443759.1U CN202123443759U CN217121223U CN 217121223 U CN217121223 U CN 217121223U CN 202123443759 U CN202123443759 U CN 202123443759U CN 217121223 U CN217121223 U CN 217121223U
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Abstract
The utility model relates to an industry danger waste salt handles technical field, and more specifically says, it relates to a resourceful treatment system of industry waste salt. The key points of the technical scheme are as follows: the anaerobic pyrolysis unit is used for decomposing organic matters in the industrial waste salt and reducing metal compounds in the industrial waste salt into metal; exhaust gas treatmentA treatment unit for treating organic matters and SO in the tail gas 2 Removal of HCl, NOx, etc.; the dissolving and impurity removing unit is used for removing residual heavy metals in the solution; the electromagnetic separation unit is used for drying and screening the separated filter residue containing the metal powder and the like; a salt separation and crystallization unit for separating Na in the solution 2 SO 4 ·10H 2 O and NaCl; a drying unit for the Na 2 SO 4 ·10H 2 And (4) drying O and NaCl. The utility model recycles valuable substances such as sodium chloride, sodium sulfate, iron, aluminum, copper, nickel and the like in the industrial waste salt to reduce the waste salt slag by more than 92 percent; SO of tail gas 2 Concentration, HCl concentration, NO x The concentration of the product reaches the comprehensive emission standard and the like.
Description
Technical Field
The utility model relates to an industry danger waste salt handles technical field, and more specifically says, it relates to a resourceful treatment system of industry waste salt.
Background
The industrial waste salt refers to waste salt containing organic matters, other toxic and harmful substances and moisture generated in the industrial production process; mainly from the industries of petrochemical industry, pesticide, medicine, fine chemical industry and the like. At present, the annual output of industrial waste salt in China exceeds 2000 million tons, the industrial waste salt is mainly treated in a landfill mode, and the method has the risks of resource waste and harmful substance re-release although the operation is simple. When the latest hazardous waste landfill pollution control standard stipulates that the industrial waste salt is prohibited from adopting flexible landfill and is strictly limited to be treated by adopting rigid landfill, the total amount of water-soluble salt must be less than 10%, and the treatment cost of the industrial waste salt adopting a landfill method can be obviously increased. In a word, the industrial waste salt has the characteristics of complex components, high toxicity, high yield, high treatment cost and the like, and in order to prevent the industrial waste salt from polluting the environment such as soil, underground water, rivers and the like, the problem of safe and harmless treatment of the industrial waste salt is urgently needed to be solved.
The prior art can solve the problem of harmless treatment of industrial waste salt, but an impurity removal system and a separation and purification system are usually adopted to remove valuable metals in the industrial waste salt in a physicochemical way without effective utilization and recovery, or a single evaporation and crystallization mode is adopted for salt separation, so that the application range is limited, and the difficulty of salt separation and purification is increased.
SUMMERY OF THE UTILITY MODEL
To the deficiency that prior art exists, the utility model aims to provide a resourceful treatment system of industry waste salt has the advantage of valuable metal recycle in organic matter clearance height, the waste salt.
The above technical purpose of the present invention can be achieved by the following technical solutions: a resourceful treatment system of industrial waste salt is characterized by comprising:
the anaerobic pyrolysis unit is used for decomposing organic matters in the industrial waste salt and reducing metal compounds in the industrial waste salt into metal;
a tail gas treatment unit connected to the anaerobic pyrolysis unit for treating organic matters and SO in the tail gas 2 Removing HCl and NOx;
the dissolving and impurity removing unit is connected to the oxygen-free pyrolysis unit and is used for removing residual heavy metals in the solution;
the electromagnetic separation unit is connected to the dissolving and impurity removing unit and is used for drying and screening the separated filter residue containing the metal powder;
a salt separation crystallization unit connected to the dissolution impurity removal unit for separating Na in the solution 2 SO 4 ·10H 2 O and NaCl;
a drying unit connected to the salt separation crystallization unit for Na 2 SO 4 ·10H 2 And (4) drying O and NaCl.
In one embodiment, the anaerobic pyrolysis unit comprises a grab bucket machine, a stirrer and a pyrolysis rotary furnace which are connected in sequence.
In one embodiment, the tail gas treatment unit comprises a flue gas combustor, an SNCR denitration tower, a wet washing tower, a dry deacidification tower, a bag-type dust collector and a fan which are sequentially connected, and a tail gas online detector is arranged at the front end of the fan.
In one embodiment, the dissolving and impurity removing unit comprises a pulverizer, a reaction tank, a filter press and a filtrate storage tank which are connected in sequence, wherein the reaction tank is connected with the filter press through a first return pipeline, and a first return pump is arranged on the first return pipeline.
In one embodiment, the electromagnetic separation unit comprises an electric heater, a vibrating screen box, an electromagnetic separator and a metal particle receiving hopper which are connected in sequence.
In one of them embodiment, divide salt crystallization unit includes the freezing crystallizer, centrifuge, freezing mother liquor storage tank, evaporation crystallizer, water ring vacuum pump, condenser, distilled water storage tank, the evaporation mother liquor storage tank that connect gradually, freezing mother liquor storage tank through the second backflow pipeline with freezing crystallizer connects, be equipped with the second backwash pump on the second backflow pipeline, the front end of water ring vacuum pump pipeline is equipped with noncondensable gas absorbing device, distilled water storage tank through the third backflow pipeline with dissolve edulcoration retort and be connected, be equipped with the third backwash pump on the third backflow pipeline.
In one embodiment, the drying unit includes a plurality of steam dryers connected in series.
In one embodiment, a conveyor belt conveyor for conveying waste salt is arranged among the oxygen-free pyrolysis unit, the dissolving and impurity removing unit and the electromagnetic separation unit, and the dissolving and impurity removing unit and the salt separation crystallization unit are connected with the drying unit through a fourth return pipeline.
In one embodiment, the salt separation and crystallization unit is connected with the dissolution and impurity removal unit through a fifth reflux pipeline.
The recycling treatment system for the industrial waste salt has the following beneficial effects:
firstly, the reduction of the waste salt slag reaches more than 92 percent through the resource recovery of valuable substances such as sodium chloride, sodium sulfate, iron, aluminum, copper, nickel and the like in the industrial waste salt;
secondly, the method has higher organic matter removal rate, the TOC removal rate reaches more than 99 percent, and SO of tail gas 2 Concentration, HCl concentration, NO x The concentration of the waste water reaches the comprehensive emission standard of the atmospheric pollutants;
thirdly, the salt separation mode is not fixed in a single mode, so that the method is suitable for treating various industrial waste salts, and the difficulty of salt separation and purification is reduced.
Drawings
Fig. 1 is a flow chart of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description of the present invention, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
A system for recycling industrial waste salt, as shown in fig. 1, comprising: the anaerobic pyrolysis unit is used for decomposing organic matters in the industrial waste salt and reducing metal compounds in the industrial waste salt into metal; a tail gas treatment unit connected to the anaerobic pyrolysis unit for treating organic matters and SO in the tail gas 2 Removal of HCl, NOx, etc.; the dissolving and impurity removing unit is connected to the oxygen-free pyrolysis unit and is used for removing residual heavy metals in the solution; the electromagnetic separation unit is connected to the dissolving and impurity removing unit and is used for drying and screening the separated filter residue containing metal powder and the like; a salt separation crystallization unit connected to the dissolution impurity removal unit for separating Na in the solution 2 SO 4 ·10H 2 O and NaCl; a drying unit connected to the salt separation crystallization unit for Na 2 SO 4 ·10H 2 And (4) drying O and NaCl.
Putting industrial waste salt and carbon powder into an anaerobic pyrolysis unit according to a certain proportion, uniformly mixing, heating, introducing nitrogen gas to perform anaerobic pyrolysis reaction and redox reaction, decomposing organic matters in the industrial waste salt into carbon powder, volatile micromolecular organic matters, nitrogen oxides, sulfides, hydrogen chloride and the like, simultaneously pyrolyzing metal compounds such as iron, aluminum, copper, nickel and the like in the industrial waste salt into oxides, and then carrying out high-temperature pyrolysis on the oxidesReduced to iron, aluminum, copper, nickel and other metals by carbon powder under the oxygen-free condition. And the oxygen-free cracking tail gas is subjected to full combustion, denitration and deacidification treatment and then is discharged after reaching the standard. And (3) enabling salt discharged from the oxygen-free pyrolysis unit to enter a dissolving and impurity removing unit, adding water for dissolving, adding sodium carbonate for reacting, adjusting the pH value, and removing residual heavy metals and calcium and magnesium in the solution. And after the reaction is finished, the obtained filter residue reaches an electromagnetic separation unit, the iron powder, the aluminum powder, the copper powder, the nickel powder and the like in the filter residue are separated and recovered through drying and screening, and the rest filter residue is buried. The water from the dissolving and impurity removing unit enters a salt separating and crystallizing unit, the frozen brine is started to cool and freeze and crystallize, and Na in the solution is separated 2 SO 4 ·10H 2 And O, then opening steam and vacuum, evaporating and crystallizing the residual solution, and separating NaCl in the solution. Na (Na) 2 SO 4 ·10H 2 The O and NaCl (wet) reach a drying unit for drying to obtain anhydrous Na 2 SO 4 And a NaCl product.
Preferably, the anaerobic pyrolysis unit comprises a grab bucket machine, a stirrer and a pyrolysis rotary furnace which are connected in sequence. Be equipped with the conveyer belt between mixer and the pyrolysis rotary furnace, the pyrolysis rotary furnace includes that nitrogen gas is imported and exported, electric heating board and pressure relief device, and the grab bucket machine drops into industry waste salt and carbon dust according to a certain proportion and mixes in the mixer evenly, sends into the pyrolysis rotary furnace through conveyer belt conveyor, and the heating of pyrolysis rotary furnace is let in nitrogen gas and is carried out anaerobic pyrolytic reaction and redox reaction. Preferably, the tail gas treatment unit comprises a flue gas combustor, an SNCR denitration tower, a wet washing tower, a dry deacidification tower, a bag-type dust remover and a fan which are connected in sequence, and a tail gas online detector is arranged at the front end of the fan. The flue gas combustor comprises a liquid spray gun, a gas spray gun, a combustion-supporting fan, an automatic ignition device and a flame detection device, the SNCR denitration tower is provided with a urea solution atomization spray gun, the wet washing tower comprises a baffle plate and PP packing, and the dry deacidification tower comprises a lime spray gun and a slag scraper. The tail gas of the pyrolysis rotary furnace is sent into a flue gas combustor by a fan to be fully combusted, and organic matters in the tail gas are fully combusted to generate CO 2 、H 2 O、SO 2 HCl and NO x The products are processed by an SNCR denitration tower, a wet washing tower and a dry method sequentiallyAbsorbing and filtering by an acid tower and a bag-type dust collector, and finally emptying the tail gas after reaching the standard.
Preferably, the dissolving and impurity removing unit comprises a pulverizer, a reaction tank, a filter press and a filtrate storage tank which are sequentially connected, the reaction tank is connected with the filter press through a first backflow pipeline, and a first backflow pump is arranged on the first backflow pipeline. The pressure filter includes manometer, flowmeter, and the filtrating storage tank includes first level gauge and first sample connection. And (3) conveying the salt discharged from the anaerobic pyrolysis unit into a crusher through a screw conveyor for crushing, putting the crushed salt into a reaction tank, adding water, stirring and dissolving, adding sodium carbonate for reaction and regulating the pH value, and removing residual heavy metal and calcium and magnesium in the solution to convert calcium sulfate in the solution into calcium carbonate to accelerate the dissolution of the salt. And pumping the solution into a filter press through a centrifugal pump after the reaction is finished, and separating filter residues containing iron powder, aluminum powder, copper powder, nickel powder and the like.
Preferably, the electromagnetic separation unit comprises an electric heater, a vibrating screen box, an electromagnetic separator and a metal particle receiving hopper which are connected in sequence. The electric heater comprises a first thermometer and a first moisture online detector; the electromagnetic separator comprises a magnetic sensor, filter residues in the dissolving and impurity removing unit are sequentially sent into the electric heater and the vibrating screen box through the screw conveyor, the filter residues are dried and screened, metal particles such as iron powder, aluminum powder, copper powder and nickel powder are ejected into different receiving hoppers through the electromagnetic separator, and the rest filter residues are buried in a landfill mode.
Preferably, divide salt crystallization unit including the freezing crystallizer, centrifuge, freezing mother liquor storage tank, evaporation crystallizer, water ring vacuum pump, condenser, distilled water storage tank, the evaporation mother liquor storage tank that connect gradually, freezing mother liquor storage tank through the second return line with the freezing crystallizer is connected, be equipped with the second backwash pump on the second return line, the front end of water ring vacuum pump pipeline is equipped with noncondensable gas absorbing device, the distilled water storage tank through the third return line with dissolve edulcoration retort and connect, be equipped with the third backwash pump on the third return line. The freezing and crystallizing tank is a jacket enamel kettle and is provided with a second thermometer, a second stirring device and a second liquid level meter; the frozen mother liquor storage tank comprises a third liquid level meter and a second sampling port, and the evaporative crystallization tank comprisesThe jacket enamel kettle is provided with a third thermometer, a third stirring device, a vacuum meter and a fourth liquid level meter, the distilled water storage tank comprises the fourth thermometer, a fifth liquid level meter and a third sampling port, effluent of the dissolution and impurity removal unit is pumped into a freezing crystallization tank through a centrifugal pump, stirring is started, the frozen brine is cooled, after freezing crystallization is completed, the solution is pumped into the centrifugal machine through a sand pump, and Na in the solution is separated 2 SO 4 ·10H 2 And O. Pumping the frozen mother liquor into an evaporative crystallization tank through a centrifugal pump, starting stirring, respectively heating and vacuumizing by adopting steam and a water ring vacuum pump, condensing evaporated water into a distilled water storage tank through a condenser, and pumping into a dissolution and impurity removal reaction tank through a reflux pump. After evaporation and crystallization are finished, the solution is pumped into a centrifuge through a sand pump, and NaCl in the solution is separated.
Preferably, the drying unit includes a plurality of steam dryers connected in sequence. The dryer comprises a fifth thermometer, a second moisture on-line detector and Na 2 SO 4 ·10H 2 O and NaCl enter a steam dryer through a conveying device to be dried respectively to obtain anhydrous Na 2 SO 4 And a NaCl product.
Preferably, a conveyor belt conveyor for conveying waste salt is arranged among the oxygen-free pyrolysis unit, the dissolution impurity removal unit and the electromagnetic separation unit, and the dissolution impurity removal unit and the salt separation crystallization unit are connected with the drying unit through a fourth backflow pipeline. Each gas involved unit is provided with a thermometer, a flowmeter and a pressure gauge and is used for ensuring the rapidness and the safety of the resource treatment process.
Preferably, as shown in fig. 1, the salt separation crystallization unit is connected with the dissolution impurity removal unit through a fifth reflux pipeline, and is used for secondary utilization of water resources.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (9)
1. A resourceful treatment system of industrial waste salt is characterized by comprising:
the anaerobic pyrolysis unit is used for decomposing organic matters in the industrial waste salt and reducing metal compounds in the industrial waste salt into metal;
a tail gas treatment unit connected to the anaerobic pyrolysis unit for treating organic matters and SO in the tail gas 2 Removing HCl and NOx;
the dissolving and impurity removing unit is connected to the oxygen-free pyrolysis unit and is used for removing residual heavy metals in the solution;
the electromagnetic separation unit is connected to the dissolving and impurity removing unit and is used for drying and screening the separated filter residue containing the metal powder;
a salt separation crystallization unit connected to the dissolution impurity removal unit for separating Na in the solution 2 SO 4 ·10H 2 O and NaCl;
a drying unit connected to the salt separation crystallization unit for Na 2 SO 4 ·10H 2 And (4) drying O and NaCl.
2. The system for recycling industrial waste salt as claimed in claim 1, wherein: the anaerobic pyrolysis unit comprises a grab bucket machine, a stirrer and a pyrolysis rotary furnace which are connected in sequence.
3. The system for recycling industrial waste salt as claimed in claim 1, wherein: the tail gas treatment unit comprises a flue gas burner, an SNCR denitration tower, a wet washing tower, a dry deacidification tower, a bag-type dust remover and a fan which are connected in sequence, and a tail gas online detector is arranged at the front end of the fan.
4. The system for recycling industrial waste salt as claimed in claim 1, wherein: the dissolving and impurity removing unit comprises a pulverizer, a reaction tank, a filter press and a filtrate storage tank which are sequentially connected, wherein the reaction tank is connected with the filter press through a first backflow pipeline, and a first backflow pump is arranged on the first backflow pipeline.
5. The system for recycling industrial waste salt as claimed in claim 1, wherein: the electromagnetic separation unit comprises an electric heater, a vibrating screen box, an electromagnetic separator and a metal particle receiving hopper which are connected in sequence.
6. The system for recycling industrial waste salt as claimed in claim 1, wherein: divide salt crystallization unit including the freezing crystallizer, centrifuge, freezing mother liquor storage tank, evaporation crystallizer, water ring vacuum pump, condenser, distilled water storage tank, evaporation mother liquor storage tank that connect gradually, freezing mother liquor storage tank through the second return line with freezing crystallizer connects, be equipped with the second backwash pump on the second return line, the front end of water ring vacuum pump pipeline is equipped with non-condensable gas absorbing device, the distilled water storage tank through the third return line with dissolve edulcoration retort and connect, be equipped with the third backwash pump on the third return line.
7. The system for recycling industrial waste salt as claimed in claim 1, wherein: the drying unit comprises a plurality of steam dryers connected in sequence.
8. The system for recycling industrial waste salt as claimed in claim 1, wherein: and a conveyor belt conveyor for conveying waste salt is arranged between the oxygen-free pyrolysis unit, the dissolution impurity removal unit and the electromagnetic separation unit, and the dissolution impurity removal unit and the salt separation crystallization unit are connected with the drying unit through a fourth return pipeline.
9. The system for recycling industrial waste salt as claimed in claim 1, wherein: and the salt separation crystallization unit is connected with the dissolution impurity removal unit through a fifth reflux pipeline.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116002640A (en) * | 2022-12-13 | 2023-04-25 | 柏中环境科技(上海)股份有限公司 | Comprehensive utilization system and comprehensive utilization method for waste salt resource circulation |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116002640A (en) * | 2022-12-13 | 2023-04-25 | 柏中环境科技(上海)股份有限公司 | Comprehensive utilization system and comprehensive utilization method for waste salt resource circulation |
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