CN106939376A - A kind of system and method for recycling super enriching plant cutting - Google Patents
A kind of system and method for recycling super enriching plant cutting Download PDFInfo
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- CN106939376A CN106939376A CN201710213807.7A CN201710213807A CN106939376A CN 106939376 A CN106939376 A CN 106939376A CN 201710213807 A CN201710213807 A CN 201710213807A CN 106939376 A CN106939376 A CN 106939376A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/001—Dry processes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/02—Apparatus therefor
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
- C22B3/12—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic alkaline solutions
- C22B3/14—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic alkaline solutions containing ammonia or ammonium salts
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
- C22B7/008—Wet processes by an alkaline or ammoniacal leaching
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
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Abstract
The invention discloses a kind of system and method for recycling super enriching plant cutting.The system includes drying unit, pyrolysis installation, leaching device, purifier, electrochemical depositer and direct-combustion boiler.Pyrolysis installation is connected with drying unit, leaching device and direct-combustion boiler respectively, and purifier is connected with leaching device and electrochemical depositer respectively, and direct-combustion boiler is also connected with drying unit.Super enriching plant cutting is pyrolyzed by the present invention, and heavy metal and pyrolysis oil gas are further handled, and both solved the pollution problem of heavy metal, the valuable resources such as metal and superheated steam can be provided again, realized the unification of environment and economic benefit.
Description
Technical field
The invention belongs to agricultural resources technical field and contaminated soil remediation field, in particular it relates to a kind of recycling
Utilize the system and method for super enriching plant cutting.
Background technology
Phytoremediation is a kind of method that heavy-metal contaminated soil is repaired, by development in recent years, phytoremediation technology
The spies such as the compatibility of permanent, governance process original position, the inexpensive cost for the treatment of cost and the aesthetics of environment with its regulation effect
Point, has been increasingly becoming one of main path of contaminated soil improvement, and initially enter industrialization initial stage.In China native country
Have found ciliate desert-grass (enrichment arsenic), Berkheya coddii plants (enriching nickel), Sedum alfredii Hance (Zn accumulation), Brassicacam
A variety of super enriching plants such as pestris (enriched lead or cadmium).Prior art is concentrated mainly on the screening of super enriching plant, chelating and lured
Lead reparation, Arbuscular Mycorrhizal Fungi reinforcing, gene technology, agronomy management and field measure etc..And on restoration of soil polluted by heavy metal after
Plant harvest thing Treatment and recovery technology, research both domestic and external report is seldom, and is essentially all that simple experiment is visited
Rope.
Effectively handle with realizing super enriching plant cutting and recycling, be that phytoremediation technology system needs perfect one
Individual difficult point is also phytoremediation technology in industrialization process, it is necessary in face of one of with key issue in the urgent need to address.This
It is due to that the plant that have accumulated plurality of heavy metal often makes heavy metal element return to soil by approach such as rotten, fallen leaves, because
This must make heavy metal element return to soil in approach such as plant defoliations, it is therefore necessary to plant body is gathered in before plant defoliation, and
By its timely harmless treatment.
Either the processing method of existing super enriching plant cutting can not effectively handle heavy metal, or it can not realize
The recycling of super enriching plant cutting, exigence provides the processing method of a kind of environment and economic benefit win-win.
The content of the invention
In order to overcome the deficiencies in the prior art, present invention firstly provides a kind of recycling super enriching plant cutting
System, including：
Drying unit, provided with drying material entrance, high-temperature flue gas entry and baking drier outlet；
Pyrolysis installation, provided with pyrolysis feed entrance, combustible gas entrance, pyrolytic carbon outlet and high-temperature oil gas outlet, the heat
Solution feed(raw material)inlet is connected with the baking drier outlet of the drying unit；
Leaching device, provided with leaching agent entrance, pyrolytic carbon entrance, charcoal outlet and leachate outlet, the pyrolytic carbon
Entrance is connected with the pyrolytic carbon outlet of the pyrolysis installation；
Purifier, provided with the outlet of zinc powder entrance, leachate entrance and scavenging solution, the leachate entrance is leached with described
The leachate outlet of device is connected；
Electrochemical depositer, provided with scavenging solution entrance, heavy metal outlet and electrodeposition waste liquid outlet, the scavenging solution entrance
It is connected with the scavenging solution outlet of the purifier；
Direct-combustion boiler, provided with the outlet of high-temperature oil gas entrance, water inlet, high-temperature flue gas outlet and superheated steam, the high temperature
Oil gas entrance is connected with the high-temperature oil gas outlet of the pyrolysis installation, the high-temperature flue gas outlet and the high temperature of the drying unit
Smoke inlet is connected.
Further, the system also includes：
Steam turbine, provided with superheated steam entrance, condensation-water drain and generating set, the superheated steam entrance with it is described remaining
The superheated steam outlet of heat boiler is connected.
Further, the leaching device is additionally provided with ammonia inlet, the electrodeposition waste liquid outlet of the electrochemical depositer
It is connected with the leaching agent entrance of the leaching device.
Further, the system also includes：
Reducing mechanism, provided with crushing feed(raw material)inlet and crushed material outlet, the crushing feed(raw material)inlet and the drying unit
Baking drier outlet be connected；
Briquetting device, provided with briquetting feed(raw material)inlet and the outlet of material bag, the briquetting feed(raw material)inlet and the reducing mechanism
Crushed material outlet is connected, and the material bag outlet is connected with the pyrolysis feed entrance of the pyrolysis installation.
Further, the anode material of the electrochemical depositer is aluminium sheet or stainless steel plate, and cathode material is high-purity
Graphite, painting ruthenium titanium plate, boronation titanium plate, titanium carbide or zirconium boride.
Present invention also offers a kind of method of use said system recycling super enriching plant cutting, including such as
Lower step：
Prepare super enriching plant cutting；
The super enriching plant cutting is sent into the drying unit and is dried, is molded；
The super enriching plant cutting after drying is sent into the pyrolysis installation and is pyrolyzed, acquisition pyrolytic carbon,
High-temperature oil gas；
The pyrolytic carbon is sent into the leaching device, with (NH4)2CO3-NH3-H2O systems are by the weight in the pyrolytic carbon
Metal is leached, and obtains leachate and charcoal；
The leachate is sent into the purifier, with the impurity element in leachate described in zinc dust precipitation, obtains net
Change liquid；
The scavenging solution is sent into the electrochemical depositer and carries out electrochemical deposition, heavy metal is obtained；
The high-temperature oil gas is sent into the direct-combustion boiler to be burnt, the water in the direct-combustion boiler is changed into overheat and steamed
Vapour, and obtain high-temperature flue gas；
The high-temperature flue gas, which is sent into the drying unit, to be used to dry the super enriching plant cutting.
Further, the above method also comprises the following steps：The superheated steam is used to generate electricity.
Further, the scavenging solution can also produce electrodeposition after the electrochemical depositer carries out electrochemical deposition
Waste liquid, the electrodeposition waste liquid is sent into the leaching device, and adds ammoniacal liquor, for leaching heavy metal.
Further, the pyrolysis temperature of the super enriching plant cutting is 400-700 DEG C, and pyrolysis time is 30-
60min, pyrolysis is incubated 20-45min after terminating.
Further, described (NH4)2CO3-NH3-H2In O systems, [NH4]+Concentration be 2-10mol/L, the concentration of ammoniacal liquor
For 1-6mol/L；The solid-to-liquid ratio for leaching step is 2:1-5:1, extraction time is 30-300min, and extraction temperature is 30-50 DEG C.
Super enriching plant cutting is pyrolyzed by the present invention, and heavy metal and pyrolysis oil gas are further located in
Reason, had both solved the pollution problem of heavy metal, the valuable resources such as metal and superheated steam can be provided again, environment and warp is realized
The unification for benefit of helping.
Brief description of the drawings
Fig. 1 be the embodiment of the present invention in a kind of recycling super enriching plant cutting system structural representation
Figure；
Fig. 2 be the embodiment of the present invention in a kind of recycling super enriching plant cutting process chart.
Embodiment
Below in conjunction with drawings and Examples, the embodiment to the present invention is described in more details, so as to energy
Enough more fully understand the solution of the present invention and the advantage of its various aspects.However, specific embodiments described below and reality
It is only descriptive purpose to apply example, rather than limitation of the present invention.
As shown in figure 1, the system of recycling super enriching plant cutting that the present invention is provided include drying unit 1,
Reducing mechanism 2, briquetting device 3, pyrolysis installation 4, leaching device 5, purifier 6, electrochemical depositer 7, the and of direct-combustion boiler 8
Steam turbine 9.
Drying unit 1 is used to dry super enriching plant cutting, contributes to super enriching plant cutting in pyrolysis installation 4
Preferably it is pyrolyzed.Drying unit 1 is provided with drying material entrance, high-temperature flue gas entry and dries drier outlet.
Reducing mechanism 2 is used to crush super enriching plant cutting, provided with feed(raw material)inlet and crushed material outlet is crushed, crushes former
Material entrance is connected with the baking drier outlet of drying unit 1.
Briquetting device 3 is used for the broken super enriching plant cutting after crushing and is pressed into material bag, so that preferably feeding is hot
Solve device 4.Briquetting device 3 is provided with briquetting feed(raw material)inlet and the outlet of material bag, and briquetting feed(raw material)inlet and the crushed material of reducing mechanism 2 go out
Mouth is connected.
Pyrolysis installation 4 is used to be pyrolyzed super enriching plant cutting.Pyrolysis installation 4 enters provided with pyrolysis feed entrance, combustible gas
Mouth, pyrolytic carbon outlet and high-temperature oil gas outlet, pyrolysis feed entrance are connected with the material bag outlet of briquetting device 3.
Leaching device 5 is used to leach heavy metal from pyrolytic carbon.Leaching device enters provided with leaching agent entrance, pyrolytic carbon
Mouth, ammonia inlet, charcoal outlet and leachate outlet, pyrolytic carbon entrance are connected with the pyrolytic carbon outlet of pyrolysis installation 4.
Impurity element of the purifier 6 in zinc dust precipitation leachate, obtains scavenging solution.Purifier 6 enters provided with zinc powder
Mouth, leachate entrance and scavenging solution outlet, leachate entrance are connected with the leachate outlet of leaching device 5.
Electrochemical depositer 7 is used to carry out electrochemical deposition reaction, heavy metal is removed from scavenging solution.Electrochemistry is sunk
Product device 7 is provided with scavenging solution entrance, heavy metal outlet and electrodeposition waste liquid outlet, the scavenging solution of scavenging solution entrance and purifier 6
Outlet is connected, and electrodeposition waste liquid outlet is connected with the leaching agent entrance of leaching device 5.
Direct-combustion boiler 8 is used for combustion high temperature oil gas, and heat and the water heat exchange of generation prepare superheated steam, and burn the height produced
Warm flue gas is used for drying unit 1 and dries super enriching plant cutting.Direct-combustion boiler 8 is provided with high-temperature oil gas entrance, water inlet, high temperature
Exhanst gas outlet and superheated steam outlet, the high-temperature oil gas entrance are connected with the high-temperature oil gas outlet of pyrolysis installation 4, high-temperature flue gas
Outlet is connected with the high-temperature flue gas entry of drying unit 1.
Steam turbine 9 is used for steam-electric power.Steam turbine 9 is provided with superheated steam entrance, condensation-water drain and generating set, overheat
Steam inlet is connected with the superheated steam outlet of waste heat boiler 8.
Super enriching plant cutting is pyrolyzed by the present invention, and heavy metal and pyrolysis oil gas are further located in
Reason, had both solved the pollution problem of heavy metal, the valuable resources such as metal and superheated steam can be provided again, environment and warp is realized
The unification for benefit of helping.
The pyrolysis installation that the present invention is used is heat carrier heat accumulating type rotating bed, and the thermal efficiency is high, reaches more than 86%.Pyrolysis dress
It is high temperature anoxybiotic environment in putting, pyrolysis devolatilization gas completely cuts off with high-temperature flue gas, it is to avoid secondary pollution.Material is relative in pyrolytic process
Expect that bed is static, be not pressurized, do not stir, radiation tube fluid is completely isolated with reacting burner hearth, it is to avoid the problem of generation flying dust.
In system shown in Fig. 1, superheated steam is used to generate electricity, and realizes recycling for resource.Of the invention other
In embodiment, superheated steam also can separately do him and use.
In system shown in Fig. 1, after electrodeposition waste liquid supplement ammonia, it is used further to leach heavy metal, not only solves electrodeposition waste liquid
The problem of processing is difficult, also a saving leaching agent, reduces production cost.In other embodiments of the invention, electrodeposition waste liquid
Discharge system after can handling.
In system shown in Fig. 1, after super enriching plant cutting is dried, by crushing and being pyrolyzed again after briquetting.It is aobvious
So, super enriching plant cutting also can not size-reduced and briquetting, dry after be directly pyrolyzed.
In the preferred embodiment of the invention, the anode material of electrochemical depositer is aluminium sheet or stainless steel plate, negative electrode
Material is high purity graphite, applies ruthenium titanium plate, boronation titanium plate, titanium carbide or zirconium boride.High purity graphite, painting ruthenium titanium plate, boronation titanium plate, carbon
It is inert metal to change titanium and zirconium boride, and obtained electrowinning quality is good, nor can produce secondary pollution.
As shown in Fig. 2 the method for the use said system recycling super enriching plant cutting that the present invention is provided, bag
Include following steps：
Prepare super enriching plant cutting；
Super enriching plant cutting is sequentially sent to be dried in drying unit 1, reducing mechanism 2 and briquetting device 3, broken
Broken and briquetting；
It will be pyrolyzed in super enriching plant cutting feeding pyrolysis installation 4 after briquetting, obtained pyrolytic carbon, high temperature oil
Gas；
Pyrolytic carbon is sent into leaching device 5, with (NH4)2CO3-NH3-H2O systems obtain the Leaching of Heavy Metals in pyrolytic carbon
Obtain leachate and charcoal；
Leachate is sent into purifier 6, with the impurity element in zinc dust precipitation leachate, scavenging solution is obtained；
Scavenging solution feeding electrochemical depositer 7 is subjected to electrochemical deposition, heavy metal and electrodeposition waste liquid is obtained；
Electrodeposition waste liquid is sent into leaching device 5, and adds ammoniacal liquor, is re-used for leaching heavy metal；
High-temperature oil gas feeding direct-combustion boiler 8 is burnt, the water in direct-combustion boiler is changed into superheated steam, and obtains high temperature
Flue gas；
Superheated steam is sent into steam turbine 9 and generated electricity；
High-temperature flue gas, which is sent into drying unit 1, to be used to dry super enriching plant cutting.
The method provided using the present invention handles super enriching plant cutting, and heavy metal recovery rate is high.
It is the same as those described above, superheated steam also can separately do him and use.
Be the same as those described above, electrodeposition waste liquid can also handle after discharge system.
Be the same as those described above, super enriching plant cutting also can not size-reduced and briquetting, dry after be directly pyrolyzed.It is preferred that
Ground, it is 20wt% (percentage by weight) left and right that super enriching plant cutting, which is dried to water content, is then crushed to 10cm or so, then
Pressure bulk density is 0.2-0.4t/m3Material bag.
Pyrolysis temperature is too low, the time is too short, and super enriching plant cutting can not be pyrolyzed completely；Pyrolysis temperature is too high, when
Between it is long, add the energy consumption of system.In the preferred embodiment of the invention, heat of the super enriching plant cutting in pyrolysis oven
It is 400-700 DEG C to solve temperature, and pyrolysis time is 30-60min.When being preferably incubated one section again after the pyrolysis of super enriching plant cutting
Between, its pyrolysis can be made more abundant.Preferably, pyrolysis is incubated 20-45min after terminating.
The present invention uses (NH4)2CO3-NH3-H2O systems leach heavy metal.In the preferred embodiment of the invention, (NH4)2CO3-NH3-H2In O systems, [NH4]+Concentration be 2-10mol/L, the concentration of ammoniacal liquor is 1-6mol/L.On this condition, leach
The solid-to-liquid ratio of step is preferably 2:1-5:1, extraction time is preferably 30-300min, and extraction temperature is preferably 30-50 DEG C.
Below with reference to specific embodiment, the present invention will be described.Institute's taking technique condition value is in following embodiments
Exemplary, its desirable number range is as shown in foregoing summary.Detection method used by following embodiments is one's own profession
The conventional detection method of industry.
Embodiment 1
The present embodiment is using the system shown in Fig. 1 and the harvest of the technological process recycling super enriching plant shown in Fig. 2
Thing.Super enriching plant cutting used by the present embodiment is alfalfa, and raw aqueous rate is 42.7wt%, and the concentration of lead is
694mg/kg (dry matter weight).It is specific as follows：
11) 1t (ton) alfalfas raw material is sent into dryer 1, drying temperature is 80 DEG C, and drying to moisture is
25.2wt%, then sends into pulverizer 2 and is crushed to 10cm or so, and sends into the progress briquetting of cuber 3, and the heap density of material bag is
0.3t/m3。
12) alfalfa after briquetting is sent into heat accumulating type rotating bed pyrolysis installation 4, wherein pyrolysis temperature is 600 DEG C, pyrolysis
Time is 50min, and pyrolysis is incubated 30min after terminating, and obtains pyrolytic carbon and high-temperature oil gas.
13) pyrolytic carbon of generation is delivered to leaching device 5, using (NH4)2CO3-NH3-H2O systems are leached, and are leached
Liquid and charcoal.[NH4]+Concentration be 2mol/L, the concentration of ammoniacal liquor is 1mol/L；The solid-to-liquid ratio for leaching step is 2:1, leach
Time is 300min, and extraction temperature is 50 DEG C.
14) leachate is sent into purifier 6, with the impurity element in zinc dust precipitation leachate, obtains scavenging solution.
15) scavenging solution feeding electrochemical depositer 7 is subjected to electrochemical deposition, obtains heavy metal.Electrochemical deposition is filled
The anode material put is stainless steel plate, and cathode material is high purity graphite.Current efficiency in electrochemical deposition process is 92%.
16) high-temperature oil gas feeding direct-combustion boiler 8 is burnt, heat and the water heat exchange of generation prepare superheated steam.Cross
Vapours is generated electricity into steam turbine 9, and alfalfa is dried in the high-temperature flue gas feeding dryer 1 of generation.
The lead that the present embodiment is reclaimed is 0.29kg, and the rate of recovery is about 73%, generating 307kwh.
Embodiment 2
The present embodiment is using the system shown in Fig. 1 and the harvest of the technological process recycling super enriching plant shown in Fig. 2
Thing.Super enriching plant cutting used by the present embodiment is ciliate desert-grass, and raw aqueous rate is 50.6wt%, and the concentration of arsenic is
2645mg/kg (dry matter weight).It is specific as follows：
21) 1t ciliate desert-grass raw material is sent into dryer 1, drying temperature is 110 DEG C, and drying to moisture is
22.5wt%, then sends into pulverizer 2 and is crushed to 10cm or so, and sends into the progress briquetting of cuber 3, and the heap density of material bag is
0.4t/m3。
22) ciliate desert-grass after briquetting is sent into heat accumulating type rotating bed pyrolysis installation 4, wherein pyrolysis temperature is 400 DEG C, pyrolysis
Time is 60min, and pyrolysis is incubated 45min after terminating, and obtains pyrolytic carbon and high-temperature oil gas.
23) pyrolytic carbon of generation is delivered to leaching device 5, using (NH4)2CO3-NH3-H2O systems are leached, and are leached
Liquid and charcoal.[NH4]+Concentration be 6mol/L, the concentration of ammoniacal liquor is 4mol/L；The solid-to-liquid ratio for leaching step is 3:1, leach
Time is 60min, and extraction temperature is 30 DEG C.
24) leachate is sent into purifier 6, with the impurity element in zinc dust precipitation leachate, obtains scavenging solution.
25) scavenging solution feeding electrochemical depositer 7 is subjected to electrochemical deposition, obtains heavy metal.Electrochemical deposition is filled
The anode material put is stainless steel plate, and cathode material is painting ruthenium titanium plate.Current efficiency in electrochemical deposition process is 93%.
26) high-temperature oil gas feeding direct-combustion boiler 8 is burnt, heat and the water heat exchange of generation prepare superheated steam.Cross
Vapours is generated electricity into steam turbine 9, and ciliate desert-grass is dried in the high-temperature flue gas feeding dryer 1 of generation.
The arsenic that the present embodiment is reclaimed is 1.06kg, and the rate of recovery is about 81%, generating 389kwh.
Embodiment 3
The present embodiment is using the system shown in Fig. 1 and the harvest of the technological process recycling super enriching plant shown in Fig. 2
Thing.Super enriching plant cutting used by the present embodiment is alfalfa, and raw aqueous rate is 45.7wt%, and the concentration of lead is
726mg/kg (dry matter weight).It is specific as follows：
31) 1t (ton) alfalfas raw material is sent into dryer 1, drying temperature is 95 DEG C, and drying to moisture is
22.5wt%, then sends into pulverizer 2 and is crushed to 10cm or so, and sends into the progress briquetting of cuber 3, and the heap density of material bag is
0.2t/m3。
32) alfalfa after briquetting is sent into heat accumulating type rotating bed pyrolysis installation 4, wherein pyrolysis temperature is 700 DEG C, pyrolysis
Time is 30min, and pyrolysis is incubated 20min after terminating, and obtains pyrolytic carbon and high-temperature oil gas.
33) pyrolytic carbon of generation is delivered to leaching device 5, using (NH4)2CO3-NH3-H2O systems are leached, and are leached
Liquid and charcoal.[NH4]+Concentration be 10mol/L, the concentration of ammoniacal liquor is 6mol/L；The solid-to-liquid ratio for leaching step is 5:1, leach
Time is 30min, and extraction temperature is 40 DEG C.
34) leachate is sent into purifier 6, with the impurity element in zinc dust precipitation leachate, obtains scavenging solution.
35) scavenging solution feeding electrochemical depositer 7 is subjected to electrochemical deposition, obtains heavy metal.Electrochemical deposition is filled
The anode material put is aluminium sheet, and cathode material is titanium carbide.Current efficiency in electrochemical deposition process is 94%.
36) high-temperature oil gas feeding direct-combustion boiler 8 is burnt, heat and the water heat exchange of generation prepare superheated steam.Cross
Vapours is generated electricity into steam turbine 9, and alfalfa is dried in the high-temperature flue gas feeding dryer 1 of generation.
The lead that the present embodiment is reclaimed is 0.307kg, and the rate of recovery is about 78%, generating 321kwh.
Knowable to above-described embodiment, the PROCESS FOR TREATMENT super enriching plant cutting provided using the present invention, heavy metal recovery
Rate height and non-secondary pollution.
To sum up, super enriching plant cutting is pyrolyzed by the present invention, and heavy metal and pyrolysis oil gas have carried out entering one
The processing of step ground, had both solved the pollution problem of heavy metal, the valuable resources such as metal and superheated steam can be provided again, ring is realized
Border and the unification of economic benefit.
Further, the high-temperature flue gas for being pyrolyzed oil gas burning generation is used to dry super enriching plant cutting by the present invention,
Most of recycling of heat is realized, process costs are reduced.
In addition, the pyrolysis installation that the present invention is used is heat carrier heat accumulating type rotating bed, the thermal efficiency is high, reaches more than 86%.
It is high temperature anoxybiotic environment in pyrolysis installation, pyrolysis devolatilization gas completely cuts off with high-temperature flue gas, it is to avoid secondary pollution.Thing in pyrolytic process
The relative material bed of material is static, is not pressurized, does not stir, radiation tube fluid and reaction burner hearth are completely isolated, it is to avoid generation flying dust
Problem.
Obviously, above-described embodiment is only intended to clearly illustrate example of the present invention, and not to embodiment
Limit.For those of ordinary skill in the field, other multi-forms can also be made on the basis of the above description
Change or variation.There is no necessity and possibility to exhaust all the enbodiments.And thus amplify out it is apparent
Change or change still in protection scope of the present invention among.
Claims (10)
1. a kind of system of recycling super enriching plant cutting, including：
Drying unit, provided with drying material entrance, high-temperature flue gas entry and baking drier outlet；
Pyrolysis installation, provided with pyrolysis feed entrance, combustible gas entrance, pyrolytic carbon outlet and high-temperature oil gas outlet, the pyrolysis is former
Material entrance is connected with the baking drier outlet of the drying unit；
Leaching device, provided with leaching agent entrance, pyrolytic carbon entrance, charcoal outlet and leachate outlet, the pyrolytic carbon entrance
It is connected with the pyrolytic carbon outlet of the pyrolysis installation；
Purifier, provided with the outlet of zinc powder entrance, leachate entrance and scavenging solution, the leachate entrance and the leaching device
Leachate outlet be connected；
Electrochemical depositer, provided with scavenging solution entrance, heavy metal outlet and electrodeposition waste liquid outlet, the scavenging solution entrance and institute
The scavenging solution outlet for stating purifier is connected；
Direct-combustion boiler, provided with the outlet of high-temperature oil gas entrance, water inlet, high-temperature flue gas outlet and superheated steam, the high-temperature oil gas
Entrance is connected with the high-temperature oil gas outlet of the pyrolysis installation, the high-temperature flue gas outlet and the high-temperature flue gas of the drying unit
Entrance is connected.
2. system according to claim 1, it is characterised in that the system also includes：
Steam turbine, provided with superheated steam entrance, condensation-water drain and generating set, the superheated steam entrance and waste heat pot
The superheated steam outlet of stove is connected.
3. system according to claim 1, it is characterised in that the leaching device is additionally provided with ammonia inlet, the electrification
The electrodeposition waste liquid outlet for learning precipitation equipment is connected with the leaching agent entrance of the leaching device.
4. system according to claim 1, it is characterised in that the system also includes：
Reducing mechanism, provided with crushing feed(raw material)inlet and crushed material outlet, the crushing feed(raw material)inlet and the baking of the drying unit
Drier outlet is connected；
Briquetting device, provided with briquetting feed(raw material)inlet and the outlet of material bag, the briquetting feed(raw material)inlet and the crushing of the reducing mechanism
Material outlet is connected, and the material bag outlet is connected with the pyrolysis feed entrance of the pyrolysis installation.
5. system according to claim 1, it is characterised in that the anode material of the electrochemical depositer be aluminium sheet or
Stainless steel plate, cathode material is high purity graphite, applies ruthenium titanium plate, boronation titanium plate, titanium carbide or zirconium boride.
6. a kind of method that any system resourceization utilizes super enriching plant cutting in use claim 1-5, including
Following steps：
Prepare super enriching plant cutting；
The super enriching plant cutting is sent into the drying unit and is dried, is molded；
The super enriching plant cutting after drying is sent into the pyrolysis installation and is pyrolyzed, pyrolytic carbon, high temperature is obtained
Oil gas；
The pyrolytic carbon is sent into the leaching device, with (NH4)2CO3-NH3-H2O systems are by the heavy metal in the pyrolytic carbon
Leach, obtain leachate and charcoal；
The leachate is sent into the purifier, with the impurity element in leachate described in zinc dust precipitation, scavenging solution is obtained；
The scavenging solution is sent into the electrochemical depositer and carries out electrochemical deposition, heavy metal is obtained；
The high-temperature oil gas is sent into the direct-combustion boiler to be burnt, the water in the direct-combustion boiler is changed into superheated steam, and
Obtain high-temperature flue gas；
The high-temperature flue gas, which is sent into the drying unit, to be used to dry the super enriching plant cutting.
7. method according to claim 6, it is characterised in that also comprise the following steps：
The superheated steam is used to generate electricity.
8. method according to claim 6, it is characterised in that the scavenging solution carries out electricity in the electrochemical depositer
After chemical deposition, electrodeposition waste liquid can be also produced, the electrodeposition waste liquid is sent into the leaching device, and adds ammoniacal liquor, is used for
Leach heavy metal.
9. method according to claim 6, it is characterised in that the pyrolysis temperature of the super enriching plant cutting is 400-
700 DEG C, pyrolysis time is 30-60min, and pyrolysis is incubated 20-45min after terminating.
10. the method according to claim 6, it is characterised in that (NH4)2CO3-NH3-H2In O systems, [NH4]+It is dense
Spend for 2-10mol/L, the concentration of ammoniacal liquor is 1-6mol/L；The solid-to-liquid ratio for leaching step is 2:1-5:1, extraction time is 30-
300min, extraction temperature is 30-50 DEG C.
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| CN110983049A (en) * | 2019-12-13 | 2020-04-10 | 中山大学 | Method for recovering nickel and energy substances from nickel super-enriched plants |
| CN111020239A (en) * | 2019-12-13 | 2020-04-17 | 中山大学 | Method for recovering rare earth and energy substances from rare earth hyper-enrichment plants |
| CN111019679A (en) * | 2019-12-13 | 2020-04-17 | 中山大学 | Device for recovering energy substances from hyper-enriched plants and application thereof |
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