CN102872705A - Device and method for carrying out electro-Fenton oxidization on HCN (hydrogen cyanide) by using liquid-phase method - Google Patents
Device and method for carrying out electro-Fenton oxidization on HCN (hydrogen cyanide) by using liquid-phase method Download PDFInfo
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- CN102872705A CN102872705A CN2012103946923A CN201210394692A CN102872705A CN 102872705 A CN102872705 A CN 102872705A CN 2012103946923 A CN2012103946923 A CN 2012103946923A CN 201210394692 A CN201210394692 A CN 201210394692A CN 102872705 A CN102872705 A CN 102872705A
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Abstract
The invention discloses a device and method for carrying out electro-Fenton oxidization on HCN (hydrogen cyanide) by using a liquid-phase method. The device comprises an electric waste gas treatment device, an HCN recovery storage tank, a gas mist eliminator, a spray liquid storage tank, an on-line monitor, an anolyte collection pool, a catholyte tank, a Fe2+ containing liquid tank, a cathodic electro-Fenton device, a (NH4) 2CO3 recovery storage tank, other waste gas treatment devices, a neutralization tank and the like. High-concentration cyanogen-containing waste gas passes through the electric waste gas treatment device firstly so as to recover most of HCN, then the residual low-concentration HCN gas is fed into the cathodic electro-Fenton device, the cathodic electro-Fenton device is a fluidized bed type device and is internally filled with a conductive medium, voltages are exerted on the two ends of the device, Fe2+-containing liquid is fed in the device, and air is fed in a cathode, so that free radicals are generated under the action of electricity, and then low-concentration HCN is oxidized into NH3 and CO2, thereby realizing the zero release of HCN and the recovery of (NH4)2CO3. The device can treat low-concentration HCN in cyanogen-containing waste gases such as calcium carbide furnace gas, coke-oven gas and the like.
Description
Technical field
The present invention relates to the devices and methods therefor of a kind of liquid phase method electricity Fenton oxidation HCN.
Background technology
The removal methods of HCN is mainly absorption process, absorption method and firing method.The method of several HCN of removing waste gas respectively has characteristics, and the pluses and minuses of every kind of processing method and the object that is suitable for processing thereof are had nothing in common with each other.During the HCN tail gas that produces in processing actual production, the factors such as cost of HCN concentration, contained other components of tail gas and discharging modes, existing equipment and processing method all can have influence on the selection of HCN removal methods.When adopting absorption method, some gas group branch affects active carbon to the suction-operated of HCN.For example when containing more steam in the waste gas, there are the competitive Adsorption phenomenon in steam and HCN, make the HCN desorb that is adsorbed and greatly reduce treatment effect.When the steam volume content surpassed 50 %, active carbon just no longer adsorbed HCN.Therefore when containing the component of influential absorption in the waste gas, tackle it and carry out necessary preliminary treatment.Consider that HCN tail gas in the production practices is mainly derived from the Pintsch process of coal and the high temperature carbonization of PAN charcoal fiber is processed, adopt Production by Catalytic Combustion Process to have larger advantage, but to the catalytic combustion research of HCN, have not yet to see the industrialization report of maturation, also mainly be in the laboratory research stage.Patent CN 201586472 U disclose a kind of cyanogen emission-control equipment that contains, contain cyanogen waste gas twice be fully absorbed after soda bath mixes, compare with operation of the prior art, absorptivity increases greatly, and reduced the caustic soda consumption amount, improved the safety in production level, consumed a large amount of chemical agents but be faced with equally, and the generation secondary pollution can not be recycled ion.And remaining low concentration HCN solution can not get processing.For this, adopt liquid phase method electricity Fenton oxidation HCN system (NH among the present invention
4)
2CO
3Purification contains cyanogen waste gas, produces free radical under the effect of electricity, will be converted into NH to HCN
3And CO
2Recycle, realize HCN zero-emission and recovery (NH
4)
2CO
3
Summary of the invention
The objective of the invention is to overcome the deficiency of existing technology, the devices and methods therefor of a kind of liquid phase method electricity Fenton oxidation HCN is provided.
The device of liquid phase method electricity Fenton oxidation HCN comprises that exhaust gas centralized gas hood, pressure controller, electronic emission-control equipment, HCN reclaim storage tank, gas demister, spray liquid storage tank, by-pass valve control, on-line monitoring device, anolyte collecting pit, negative electrode flow container, contain Fe
2+NaOH solution tank NaOH, cathodic electricity Fenton device, gas cylinder, air blast, (NH
4)
2CO
3Reclaim storage tank, other emission-control equipments, neutralization pond; Electronic emission-control equipment comprises spray head, amberplex, cathode chamber, anode chamber, inertia filler, the first minus plate, first anode plate, the first dc source, electronic this body and function of emission-control equipment ion selectivity exchange membrane is separated into cathode chamber, anode chamber, be filled with the inertia filler in cathode chamber and the anode chamber, be provided with first anode plate in the anode chamber, first anode plate links to each other with the first dc power anode, be provided with the first minus plate in the cathode chamber, the first minus plate links to each other with the first dc power cathode; Be filled with conducting medium in cathodic electricity Fenton device, cathodic electricity Fenton device is provided with second plate plate and the second minus plate, and the second plate plate links to each other with the positive pole of the second dc source, and the second minus plate links to each other with the negative pole of the second dc source; The exhaust gas centralized gas hood links to each other with electronic emission-control equipment cathode chamber through pressure controller; Top, emission-control equipment anode chamber links to each other with the HCN solution entrance of cathodic electricity Fenton device through pressure controller, HCN recovery storage tank, by-pass valve control; Electronic emission-control equipment cathode chamber top links to each other with other gas treatment equipments through pressure controller; Bottom, electronic emission-control equipment anode chamber links to each other with the anolyte entrance of cathodic electricity Fenton device through on-line monitoring device, anode flow container, by-pass valve control, and electronic emission-control equipment cathode chamber bottom links to each other with the catholyte entrance of cathodic electricity Fenton device through on-line monitoring device, negative electrode flow container, by-pass valve control; The negative electrode flow container links to each other with the spray liquid storage tank through by-pass valve control, neutralization pond, by-pass valve control; The spray liquid storage tank is divided into two-way behind by-pass valve control, on-line monitoring device, the one tunnel through by-pass valve control, spray head and electrokinetic process exhaust device cathode chamber, and another Lu Yilu is through by-pass valve control, spray head and electrokinetic process exhaust device anode chamber; Contain Fe
2+NaOH solution tank NaOH is through the Fe of by-pass valve control and cathodic electricity Fenton device
2+The solution entrance links to each other; Gas cylinder links to each other (NH through air blast with cathodic electricity Fenton bottom of device entrance
4)
2CO
3Reclaiming storage tank links to each other with the outlet of cathodic electricity Fenton bottom of device through by-pass valve control.
Described inertia filler is one or more in convex-concave trenches openings porcelain ball, active porcelain ball, Pored ceramic ball, micropore porcelain ball, accumulation of heat porcelain ball, grinding porcelain ball, three shape porous porcelains, the resin extender.
The material of described first anode plate and second plate plate is graphite, active carbon fiber felt, active carbon fiber fabrics and conducting metal or metal oxide, is coated with PbO on conducting metal or the metal oxide
2, RuO
2, IrO
2, TiO
2, MnO
2In at least a; The material of the first minus plate is stainless steel electrode, graphite, active carbon fiber felt, active carbon fiber fabrics and conducting metal or metal oxide, is coated with PbO on conducting metal or the metal oxide
2, RuO
2, IrO
2, TiO
2, MnO
2In at least a; The material of the second minus plate 15 is Activated Carbon Fiber Electrodes, graphite electrode, graphite gas-diffusion electrode, active carbon gas-diffusion electrode, multiple-wall carbon nanotube electrode; Netted, the poroid or wire grid shape of being shaped as of battery lead plate.
The described Fe that contains
2+Solution in the NaOH solution tank NaOH can be ferrous sulfate, frerrous chloride, ferrous nitrate.
Be provided with clear water in the described HCN absorption plant; Described ion selectivity exchange membrane is homogeneous-phase anion exchange film or out-phase anion-exchange membrane.
The method of the liquid phase electricity Fenton oxidation HCN of described device is that electronic emission-control equipment produces direct current more than 20V, impel to produce a large amount of H in the anode chamber
+, forming acid atmosphere, cathode chamber produces a large amount of OH
-, form alkaline atmosphere; After containing cyanogen waste gas and in electronic emission-control equipment 3, absorbed by spray liquid in the exhaust gas centralized gas hood, cyanogen in cathode chamber PH greater than being converted into CN under 13 strong alkaline conditions more than 99%
-Then under electro ultrafiltration, move, enter the anode chamber through anion-exchange membrane, and generate pure HCN gas at PH under less than 2 highly acid atmosphere, the HCN gas that generates enters HCN and reclaims storage tank by clear water absorption generation hydrogen cyanide solution, hydrogen cyanide solution enters cathodic electricity Fenton oxidation device, adopts cathodic electricity Fenton device to be oxidized to NH
3And CO
2, realize (NH
4)
2CO
3Reclaim, process is: O
2+ 2H
++ 2e → H
2O
2Fe
2++ H
2O
2→ OH+OH
-+ Fe
3+HCN+OH → NH
3+ CO
2Fe
3++ e
-→ Fe
2+, the NH that oxidation generates
3And CO
2Be converted into (NH
4)
2CO
3Product enters (NH at last
4)
2CO
3Reclaiming storage tank recycles; Spray liquid in the described spray liquid storage tank is for containing NaCl, Na
2SO
4, Na
3PO
4, Na
2HPO
4, NaNO
3In at least a brackish water, salt content is 0.01%-10%, can carry out intermittence and continuous spray-absorption HCN; Drawn through anolyte and catholyte that electronic emission-control equipment produces, enter respectively anode flow container, negative electrode flow container, the anode flow container passes into cathodic electricity Fenton oxidation device by by-pass valve control control and carries out electric Fenton oxidation reaction, liquid storage in the negative electrode flow container, a part enters the neutralization pond neutralization, neutralizer is used for replenishing the spray liquid in the spray pond, and another part passes into cathodic electricity Fenton oxidation device by by-pass valve control control and carries out electric Fenton oxidation reaction; Fe
2+Solution in the NaOH solution tank NaOH passes into electric Fenton oxidation device under the control of by-pass valve control; Described spray head is the spiral spray assembly of wing, and spray liquid tangentially disperses to form tiny cloud point, and HCN is dissolved in and forms efficient absorption efficiency in these cloud points.
Described conducting metal or metal oxide coated have PbO
2, RuO
2, IrO
2, TiO
2, MnO
2In the preparation method of at least a conducting metal be, with PbO
2, RuO
2, IrO
2, TiO
2, MnO
2In at least a being coated on the conducting metal, sintering 6 h under 200-300 ℃ of left and right sides temperature.
Compared with prior art, the present invention has the following advantages:
Low concentration CN
-Adopt electric Fenton device with CN
-Be converted into NH
3And CO
2, realize HCN zero-emission and recovery (NH
4)
2CO
3
Description of drawings
Fig. 1 is the apparatus structure schematic diagram that electric Fenton purifies remaining HCN;
Fig. 2 is that Fenton purifies remaining HCN Method And Principle figure;
Among the figure: exhaust gas centralized gas hood 1, pressure controller 2, electronic emission-control equipment 3, HCN reclaim storage tank 4, gas demister 5, spray liquid storage tank 6, by-pass valve control 7, on-line monitoring device 8, anolyte collecting pit 10, negative electrode flow container 11, contain Fe
2+NaOH solution tank NaOH 12, cathodic electricity Fenton device 13, gas cylinder 18, air blast 19, (NH
4)
2CO
3Reclaim storage tank 20, other emission-control equipments 21, neutralization pond 22, ion selectivity exchange membrane 23, cathode chamber 24, anode chamber 25, inertia filler 26, be provided with first anode plate 28, the first dc source 29 in the anode chamber.
The specific embodiment
As shown in Figure 1, the device of liquid phase method electricity Fenton oxidation HCN comprises that exhaust gas centralized gas hood 1, pressure controller 2, electronic emission-control equipment 3, HCN reclaim storage tank 4, gas demister 5, spray liquid storage tank 6, by-pass valve control 7, on-line monitoring device 8, anolyte collecting pit 10, negative electrode flow container 11, contain Fe
2+NaOH solution tank NaOH 12, cathodic electricity Fenton device 13, gas cylinder 18, air blast 19, (NH
4)
2CO
3Reclaim storage tank 20, other emission-control equipments 21, neutralization pond 22; Electronic emission-control equipment 3 comprises spray head 9, amberplex 23, cathode chamber 24, anode chamber 25, inertia filler 26, the first minus plate 27, first anode plate 28, the first dc source 29,3 body and function ion selectivities of electronic emission-control equipment exchange membrane 23 is separated into cathode chamber 24, anode chamber 25, be filled with inertia filler 26 in cathode chamber 24 and the anode chamber 25, be provided with first anode plate 28 in the anode chamber, first anode plate 28 and 29 anodal linking to each other of the first dc source, being provided with the first minus plate 27, the first minus plates 27 in the cathode chamber links to each other with the first dc source 29 negative poles; In cathodic electricity Fenton device 13, be filled with conducting medium 17, cathodic electricity Fenton device 13 is provided with second plate plate 14 and the second minus plate 15, second plate plate 14 links to each other with the positive pole of the second dc source 16, and the second minus plate 15 links to each other with the negative pole of the second dc source 16; Exhaust gas centralized gas hood 1 links to each other with electronic emission-control equipment 3 cathode chambers through pressure controller 2; Top, emission-control equipment 3 anode chamber links to each other with the HCN solution entrance of cathodic electricity Fenton device 13 through pressure controller 2, HCN recovery storage tank 4, by-pass valve control 7; Electronic emission-control equipment 3 cathode chamber tops link to each other with other gas treatment equipments 21 through pressure controller 2; Bottom, electronic emission-control equipment 3 anode chambers links to each other with the anolyte entrance of cathodic electricity Fenton device 13 through on-line monitoring device 8, anode flow container 10, by-pass valve control 7, and electronic emission-control equipment 3 cathode chambers bottom links to each other with the catholyte entrance of cathodic electricity Fenton device 13 through on-line monitoring device 8, negative electrode flow container 11, by-pass valve control 7; Negative electrode flow container 11 links to each other with spray liquid storage tank 6 through by-pass valve control 7, neutralization pond 22, by-pass valve control 7; Spray liquid storage tank 6 is divided into two-way behind by-pass valve control 7, on-line monitoring device 8, the one tunnel through by-pass valve control 7, spray head 9 and electrokinetic process exhaust device 3 cathode chambers 24, and another Lu Yilu is through by-pass valve control 7, spray head 9 and electrokinetic process exhaust device 3 anode chambers 25; Contain Fe
2+NaOH solution tank NaOH 12 is through the Fe of by-pass valve control 7 with cathodic electricity Fenton device 13
2+The solution entrance links to each other; Gas cylinder 18 links to each other (NH through air blast 19 with cathodic electricity Fenton device 13 bottom inlets
4)
2CO
3Reclaiming storage tank 20 links to each other with cathodic electricity Fenton device 13 outlet at bottoms through by-pass valve control 7.Entrance 1 is HCN solution entrance, and entrance 2 is the anolyte entrance, and entrance 3 is the catholyte entrance, and entrance 4 is Fe
2+The solution entrance.
Inertia filler 26 is one or more in convex-concave trenches openings porcelain ball, active porcelain ball, Pored ceramic ball, micropore porcelain ball, accumulation of heat porcelain ball, grinding porcelain ball, three shape porous porcelains, the resin extender.
The material of first anode plate 28 and second plate plate 14 is graphite, active carbon fiber felt, active carbon fiber fabrics and conducting metal or metal oxide, is coated with PbO on conducting metal or the metal oxide
2, RuO
2, IrO
2, TiO
2, MnO
2In at least a; The material of the first minus plate 27 is stainless steel electrode, graphite, active carbon fiber felt, active carbon fiber fabrics and conducting metal or metal oxide, is coated with PbO on conducting metal or the metal oxide
2, RuO
2, IrO
2, TiO
2, MnO
2In at least a; The material of the second minus plate 15 is Activated Carbon Fiber Electrodes, graphite electrode, graphite gas-diffusion electrode, active carbon gas-diffusion electrode, multiple-wall carbon nanotube electrode; Netted, the poroid or wire grid shape of being shaped as of battery lead plate.
Contain Fe
2+Solution in the NaOH solution tank NaOH 12 can be ferrous sulfate, frerrous chloride, ferrous nitrate.
Be provided with clear water in the HCN absorption plant 4; Ion selectivity exchange membrane 23 is homogeneous-phase anion exchange film or out-phase anion-exchange membrane.
The method of liquid phase electricity Fenton oxidation HCN is: electronic emission-control equipment 3 produces direct current more than 20V, impel a large amount of H of anode chamber's 24 interior generations
+, forming acid atmosphere, cathode chamber 25 produces a large amount of OH
-, form alkaline atmosphere; After containing cyanogen waste gas and absorbed by spray liquid in electronic emission-control equipment 3 in the exhaust gas centralized gas hood 1, cyanogen is converted into CN at cathode chamber 25 interior PH under greater than 13 strong alkaline conditions more than 99%
-Then under electro ultrafiltration, move, enter anode chamber 24 through anion-exchange membrane 26, and generate pure HCN gas at PH under less than 2 highly acid atmosphere, the HCN gas that generates enters HCN and reclaims storage tank 4 by clear water absorption generation hydrogen cyanide solution, hydrogen cyanide solution enters cathodic electricity Fenton oxidation device 13, adopts cathodic electricity Fenton device to be oxidized to NH
3And CO
2, realize (NH
4)
2CO
3Reclaim, process is: O
2+ 2H
++ 2e → H
2O
2Fe
2++ H
2O
2→ OH+OH
-+ Fe
3+HCN+OH → NH
3+ CO
2Fe
3++ e
-→ Fe
2+, the NH that oxidation generates
3And CO
2Be converted into (NH
4)
2CO
3Product enters (NH at last
4)
2CO
3Reclaiming storage tank 20 recycles; Spray liquid in the described spray liquid storage tank 6 is for containing NaCl, Na
2SO
4, Na
3PO
4, Na
2HPO
4, NaNO
3In at least a brackish water, salt content is 0.01%-10%, can carry out intermittence and continuous spray-absorption HCN; Drawn through anolyte and catholyte that electronic emission-control equipment 3 produces, enter respectively anode flow container 10, negative electrode flow container 11, anode flow container 10 passes into cathodic electricity Fenton oxidation device 13 by by-pass valve control 7 controls and carries out electric Fenton oxidation reaction, liquid storage in the negative electrode flow container 11, a part enters neutralization pond 22 neutralizations, neutralizer is used for replenishing the spray liquid in the spray pond 6, and another part passes into cathodic electricity Fenton oxidation device 13 by by-pass valve control 7 controls and carries out electric Fenton oxidation reaction; Fe
2+Solution in the NaOH solution tank NaOH 12 passes into electric Fenton oxidation device under the control of by-pass valve control 7; Described spray head 9 is the spiral spray assembly of wing, and spray liquid tangentially disperses to form tiny cloud point, and HCN is dissolved in and forms efficient absorption efficiency in these cloud points.
With PbO
2, RuO
2, IrO
2, TiO
2, MnO
2In at least a being coated on the conducting metal, sintering 6 h prepare conducting metal or metal oxide under 200-300 ℃ of left and right sides temperature.
Embodiment 1
The device Treatment of Carbon of employing a kind of liquid phase method electricity Fenton oxidation HCN as shown in Figure 1 contains the HCN in the cyanogen waste gas.HCN concentration is 90mg/m in the waste gas
3, after migration is reclaimed and is purified and contains the device of cyanogen waste gas through electric power, CN
-In electric Fenton oxidation device, be oxidized to (NH
4)
2CO
3Recovery can obtain the product into 96.6%-98.7% through being recrystallized.
Embodiment 2
Adopt to adopt two groups of electronic emission-control equipments series connection to reclaim HCN in the calcium carbide furnace gas among the embodiment 2, operating procedure, principle are identical with embodiment 1.HCN concentration is 2.45g/m in the waste gas
3, after process electric power migration recovery contains the cyanogen exhaust device with purification, CN
-In electric Fenton oxidation device, be oxidized to (NH
4)
2CO
3Recovery can obtain the product into 97%-98.5% through being recrystallized.
Claims (6)
1. the device of a liquid phase method electricity Fenton oxidation HCN is characterized in that comprising that exhaust gas centralized gas hood (1), pressure controller (2), electronic emission-control equipment (3), HCN reclaim storage tank (4), gas demister (5), spray liquid storage tank (6), by-pass valve control (7), on-line monitoring device (8), anolyte collecting pit (10), negative electrode flow container (11), contain Fe
2+NaOH solution tank NaOH (12), cathodic electricity Fenton device (13), gas cylinder (18), air blast (19), (NH
4)
2CO
3Reclaim storage tank (20), other emission-control equipments (21), neutralization pond (22); Electronic emission-control equipment (3) comprises spray head (9), amberplex (23), cathode chamber (24), anode chamber (25), inertia filler (26), the first minus plate (27), first anode plate (28), the first dc source (29), electronic emission-control equipment (3) this body and function ion selectivity exchange membrane (23) is separated into cathode chamber (24), anode chamber (25), be filled with inertia filler (26) in cathode chamber (24) and anode chamber (25), be provided with first anode plate (28) in the anode chamber, first anode plate (28) links to each other with the first dc source (29) is anodal, be provided with the first minus plate (27) in the cathode chamber, the first minus plate (27) links to each other with the first dc source (29) negative pole; In cathodic electricity Fenton device (13), be filled with conducting medium (17), cathodic electricity Fenton device (13) is provided with second plate plate (14) and the second minus plate (15), second plate plate (14) links to each other with the positive pole of the second dc source (16), and the second minus plate (15) links to each other with the negative pole of the second dc source (16); Exhaust gas centralized gas hood (1) links to each other with electronic emission-control equipment (3) cathode chamber through pressure controller (2); Spray liquid storage tank (6) is divided into two-way through by-pass valve control (7), on-line monitoring device after (8), one the tunnel links to each other with electrokinetic process exhaust device (3) cathode chamber (24) through by-pass valve control (7), spray head (9), and another Lu Yilu links to each other with electrokinetic process exhaust device (3) anode chamber (25) through by-pass valve control (7), spray head (9); Emission-control equipment (3) top, anode chamber links to each other with cathodic electricity Fenton device (13) HCN solution entrance through pressure controller (2), HCN recovery storage tank (4), by-pass valve control (7); Electronic emission-control equipment (3) cathode chamber top links to each other with other gas treatment equipments (21) through pressure controller (2); Bottom, electronic emission-control equipment (3) anode chamber links to each other with cathodic electricity Fenton device (13) anolyte entrance through on-line monitoring device (8), anode flow container (10), by-pass valve control (7), and electronic emission-control equipment (3) cathode chamber bottom links to each other with cathodic electricity Fenton device (13) catholyte entrance through on-line monitoring device (8), negative electrode flow container (11), by-pass valve control (7); Negative electrode flow container (11) is through by-pass valve control (7), neutralization pond (22), by-pass valve control (7) and link to each other; Contain Fe
2+NaOH solution tank NaOH (12) is through by-pass valve control (7) and cathodic electricity Fenton device (13) Fe
2+The solution entrance links to each other; Gas cylinder (18) links to each other (NH through air blast (19) with cathodic electricity Fenton device (13) bottom inlet
4)
2CO
3Reclaiming storage tank (20) links to each other with cathodic electricity Fenton device (13) outlet at bottom through by-pass valve control (7).
2. the device of a kind of liquid phase method electricity Fenton oxidation HCN according to claim 1 is characterized in that described inertia filler (26) is one or more in convex-concave trenches openings porcelain ball, active porcelain ball, Pored ceramic ball, micropore porcelain ball, accumulation of heat porcelain ball, grinding porcelain ball, three shape porous porcelains, the resin extender.
3. the device of a kind of liquid phase method electricity Fenton oxidation HCN according to claim 1, the material that it is characterized in that described first anode plate (28) and second plate plate (14) is graphite, active carbon fiber felt, active carbon fiber fabrics, conducting metal or metal oxide, is coated with PbO on conducting metal or the metal oxide
2, RuO
2, IrO
2, TiO
2, MnO
2In at least a; The material of the first minus plate (27) is stainless steel electrode, graphite, active carbon fiber felt, active carbon fiber fabrics, conducting metal or metal oxide, is coated with PbO on conducting metal or the metal oxide
2, RuO
2, IrO
2, TiO
2, MnO
2In at least a; The material of the second minus plate (15) is Activated Carbon Fiber Electrodes, graphite electrode, graphite gas-diffusion electrode, active carbon gas-diffusion electrode, multiple-wall carbon nanotube electrode; Netted, the poroid or wire grid shape of being shaped as of battery lead plate.
4. the device of a kind of liquid phase method electricity Fenton oxidation HCN according to claim 1 is characterized in that the described Fe of containing
2+NaOH solution tank NaOH is provided with solution in (12), and solution is ferrous sulfate, frerrous chloride or ferrous nitrate.
5. the device of a kind of liquid phase method electricity Fenton oxidation HCN according to claim 1 is characterized in that being provided with clear water in the described HCN absorption plant (4); Ion selectivity exchange membrane (23) is homogeneous-phase anion exchange film or out-phase anion-exchange membrane.
6. the method for the liquid phase electricity Fenton oxidation HCN that installs as claimed in claim 1 of a use is characterized in that electronic emission-control equipment (3) produces direct current more than 20V, impels to produce a large amount of H in the anode chamber (25)
+, forming acid atmosphere, cathode chamber (24) produces a large amount of OH
-, form alkaline atmosphere; After containing cyanogen waste gas and absorbed by spray liquid in electronic emission-control equipment (3) in the exhaust gas centralized gas hood (1), cyanogen PH in cathode chamber (24) is converted into CN under greater than 13 strong alkaline conditions more than 99%
-Then under electro ultrafiltration, move, enter anode chamber (25) through anion-exchange membrane (26), and generate pure HCN gas at PH under less than 2 highly acid atmosphere, the HCN gas that generates enters HCN and reclaims storage tank (4) by clear water absorption generation hydrogen cyanide solution, hydrogen cyanide solution enters cathodic electricity Fenton oxidation device (13), adopts cathodic electricity Fenton device to be oxidized to NH
3And CO
2, realize (NH
4)
2CO
3Reclaim, process is: O
2+ 2H
++ 2e → H
2O
2Fe
2++ H
2O
2→ OH+OH
-+ Fe
3+HCN+OH → NH
3+ CO
2Fe
3++ e
-→ Fe
2+, the NH that oxidation generates
3And CO
2Be converted into (NH
4)
2CO
3Product enters (NH at last
4)
2CO
3Reclaiming storage tank (20) recycles; Spray liquid in the described spray liquid storage tank (6) is for containing NaCl, Na
2SO
4, Na
3PO
4, Na
2HPO
4, NaNO
3In at least a brackish water, salt content is 0.01%-10%, can carry out intermittence and continuous spray-absorption HCN; Drawn through anolyte and catholyte that electronic emission-control equipment (3) produces, enter respectively anode flow container (10), negative electrode flow container (11), anode flow container (10) passes into cathodic electricity Fenton oxidation device (13) by by-pass valve control (7) control and carries out electric Fenton oxidation reaction, liquid storage in the negative electrode flow container (11), a part enters neutralization pond (22) neutralization, neutralizer is used for replenishing the spray liquid in the spray pond (6), and another part passes into cathodic electricity Fenton oxidation device (13) by by-pass valve control (7) control and carries out electric Fenton oxidation reaction; Fe
2+Solution in the NaOH solution tank NaOH (12) passes into electric Fenton oxidation device under the control of by-pass valve control (7); Described spray head (9) is the spiral spray assembly of wing, and spray liquid tangentially disperses to form tiny cloud point, and HCN is dissolved in and forms efficient absorption efficiency in these cloud points.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210394692.3A CN102872705B (en) | 2012-10-17 | 2012-10-17 | Device and method for carrying out electro-Fenton oxidization on HCN (hydrogen cyanide) by using liquid-phase method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210394692.3A CN102872705B (en) | 2012-10-17 | 2012-10-17 | Device and method for carrying out electro-Fenton oxidization on HCN (hydrogen cyanide) by using liquid-phase method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108117232A (en) * | 2017-12-13 | 2018-06-05 | 长春黄金研究院 | Gold industry extraction of gold process biological oxidation solution handles sludge containing cyanogens detoxification method |
| CN116081781A (en) * | 2023-04-06 | 2023-05-09 | 天津市环境保护技术开发中心设计所有限责任公司 | High-voltage cathode electro-Fenton catalytic oxidation sewage treatment device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1035958A (en) * | 1988-03-22 | 1989-10-04 | 浙江大学 | Contain the deep-purifying method of hydrogen cyanide tail gas and the preparation method of decyanation agent |
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| US5968465A (en) * | 1996-04-23 | 1999-10-19 | Exxon Research And Engineering Co. | Process for removal of HCN from synthesis gas |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108117232A (en) * | 2017-12-13 | 2018-06-05 | 长春黄金研究院 | Gold industry extraction of gold process biological oxidation solution handles sludge containing cyanogens detoxification method |
| CN108117232B (en) * | 2017-12-13 | 2021-04-06 | 长春黄金研究院有限公司 | Harmless method for treating cyanide-containing tailing slurry by biological oxidation liquid in gold extraction process in gold industry |
| CN116081781A (en) * | 2023-04-06 | 2023-05-09 | 天津市环境保护技术开发中心设计所有限责任公司 | High-voltage cathode electro-Fenton catalytic oxidation sewage treatment device |
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| CN102872705B (en) | 2014-09-10 |
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