Technical field
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The invention belongs to iron-carbon micro-electrolysis technical field of sewage, and in particular to a kind of nano iron-carbon micro-electrolytic filler Preparation method.
Background technology
What it is along with rapid economic development is embarrassed shape that water pollution has threatened the national economic development and people's health. The discharge capacity of industrial wastewater accounts for the 44% of sewage total amount, but has 70% to derive from industrial wastewater pollution in water pollution, unprocessed straight Run in put and by certain processing but still the industrial wastewater that does not reach discharge standard is the major reason for causing water pollution.It is this kind of useless Water is essentially from the waste water of the industries such as chemical industry, synthesis pharmaceutical, agricultural chemicals, grain processing, fermentation, coking, the group of organic wastewater Point complicated, concentration is high, and containing various organic acids, aldehyde, alcohol, ketone, ester, ether etc., its COD is very high, even as high as tens of thousands of or even tens Ten thousand mg/L&#;Benzene, sulphur, phenol, amine in organic wastewater&#;Nitrile&#;There is obvious toxicity Deng pollutant, it is impossible to handle hand with conventional sewage Section processing, country implements monitor closely to pollutant emission index, with the appearance of 13 planning, has been born " most strict " Environmentally friendly management system, the formulation and revision of standard is also more strict, forces chemical industry waste water treatment technology to develop.
Fe-C Micro Electrolysis Method is removed COD, is improved waste water using the effective oxidative degradation organic substance of electrochemical reaction energy Biochemical coefficient&#;BOD/COD&#;, waste water mesophytization method is difficult to the material degraded, by modification, is able to become energy biochemical degradation Material is directly removed&#;Its electric flocculation effect simultaneously, effective sedimentation organics removal content, Fe-C Micro Electrolysis Method coordinates fragrant Technique of pausing is fairly obvious to the chemical wastewater treatment effect rich in high-concentration hardly-degradable organic pollution.
It is crucial that the performance of iron-carbon micro-electrolysis filler during iron-carbon micro-electrolysis processing waste water.Publication No. CN patent of invention discloses a kind of massive micro-electrolysis stuffing and its preparation technology, and the filler is by coal for coking 20 ~40 parts, 2~15 parts of compositions of 40~70 parts of iron filings and binding agent, coal for coking, iron filings and binding agent are in proportion 80~300 It is well mixed, is press-formed under 5~15MPa pressure under the conditions of DEG C, the material after shaping is high under the conditions of ~ DEG C Warm destructive distillation 3~8 hours, obtains block filler.Publication No. CN patent of invention discloses a kind of regular iron Carbon micro-electrolysis filler and preparation method thereof, is made up of iron filings, powdered active carbon and clay, during preparation, and raw material is mixed in proportion Added water after conjunction and granulated filler is made, dried, then moved into Muffle furnace, in roasting 2~4 at 250~600 DEG C under the conditions of oxygen barrier Hour.The A of Publication No. CN patent of invention discloses a kind of degrading industrial waste water light electrolysis iron-carbon micro-electrolysis and filled out Material, is made up of 55~70 parts by weight iron powders, 30~40 parts by weight of activated carbon and 1~2 parts by weight binder.Wherein, iron powder is carbon The iron powder of content 4%&#;Binding agent is by 5~6 parts by weight sodium metasilicate, 1~3 parts by weight calcium chloride and 1~3 parts by weight hydroxy propyl cellulose Element composition, is made 250~300 DEG C of drying after 15~30mm ball.The A of Publication No. CN patent discloses one Iron-carbon micro-electrolysis filler of industrial wastewater pre-micro-electrolysis disposal and preparation method thereof is planted, the iron-carbon micro-electrolysis filler is by reproducibility iron Powder, activated carbon and attapulgite are formed, and the mass ratio of reproducibility iron powder and activated carbon is 1:1 ~ 9, the addition of attapulgite is 0.5-2.0cm Ball-type packings are made after the 10% ~ 40% of reproducibility iron powder and activated carbon gross mass, shaping and roasting.
The problem of above iron-carbon micro-electrolysis filler, is, or iron powder used is uneven, or preparation condition is harsh, and And sintering temperature is too high causes oxidation of iron powder, the activity reduction of filler, or bonding agent also to there is insufficient strength, easily in water point Solution, the using effect of influence filler and the shortcomings of cause secondary pollution, or cost high intensity and porosity are not enough etc..
The content of the invention
It is an object of the invention to&#;There is provided a kind of preparation of nano iron-carbon micro-electrolytic filler in view of the shortcomings of the prior art Method, simplifies filler preparation process, and stable, the active good, cost of performance of iron-carbon micro-electrolysis filler is low, accumulation porosity It is high, it is adaptable to the processing of high concentration hard-degraded organic waste water.
What the present invention was realized using following technical solution&#;The nano iron-carbon micro-electrolytic filler is by reduced iron powder, stone Prepared by ink, activated carbon and clay, the mass percent that each component accounts for gross weight is&#;Reduced iron powder 40% ~ 75%, graphite and activated carbon Total amount 10 ~ 30%, clay 15 ~ 30%&#;Wherein, mass content of graphite accounts for the 5 ~ 100% of graphite and Mixture of Activated Carbon.
Wherein, reduced iron powder, graphite, activated carbon, clay size are respectively less than 200 mesh.
Wherein, iron content is more than 95% in the reduced iron powder.
Wherein, the graphite is Scaly graphite or amorphous graphite, and its carbon content is more than 70%.
Wherein, the clay viscosity is more than 190mpa.s&#;30rpm, No. 2 rotors, NDJ-5S digital display viscosimeters&#;.
Wherein, the preparation method comprises the following steps&#;
1. batch mixing&#;Iron powder, graphite, activated carbon, clay powders are well mixed in batch mixer by weight adding&#;
2. one-step forming at the beginning of&#;Wettability is progressively added water into step 1. mixed material, and to reach that hand is pinched plastic&#;
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3. extrusion forming&#;The compound of step 2. is squeezed into φ 2cmx1cm ~ φ 6cmx3cm with coal briquette extruder oblate&#;
4. it is calcined&#;By step, 3. the oblate of gained expects 300 ~ 500 DEG C of 1 ~ 3h of roasting in sintering furnace, obtains the nano iron-carbon Micro-electrolysis stuffing.
Advantages of the present invention is as follows&#;
1&#;The nano iron-carbon micro-electrolytic filler of the present invention is without hardened, passivation phenomenon&#;
2&#;The present invention is without using Chemical Felter, using clay, stable when using, and does not hydrolyze and has suction-operated, does not produce two Secondary pollution, sintering temperature is low, and iron powder is difficult to be oxidized at this temperature, and nitrogen protection is not needed in preparation process or behaviour is vacuumized Make easy&#;
3&#;Graphite strengthens electric conductivity, is favorably improved treatment effect, prevents galvanic cell short circuit
4&#;Obtained filler is in oblateness, and intensity is big, and porosity is high, and the contact area with waste water is big, high treating effect&#;
5&#;Average pore size is less than 30nm, and absorption property is good, and treatment effeciency is high.
Embodiment
Technical scheme is described in detail with reference to specific embodiment, but they are not constituted to this hair Bright restriction, is only for example.
Embodiment 1&#;By the reduced iron powder of 200 mesh&#;Iron content &#; 95%&#;40kg, Scaly graphite&#;Carbon content &#; 70%&#; 1.5kg, activated carbon 28.5kg and clay&#;Viscosity is 195mpa.s/30rpm, No. 2 rotors, NDJ-5S digital display viscosimeters&#;30kg exists Mixed in batch mixer&#;Progressively adding water to wettability into compound again, to reach that hand is pinched plastic&#;Then coal briquette extruder pressure is sent into It is oblate into φ 6cmx3cm&#;Finally 500 DEG C of roasting 3h in sintering furnace, obtain nano iron-carbon micro-electrolytic filler.
Embodiment 2&#;By the reduced iron powder of 200 mesh&#;Iron content &#; 95%&#;75kg, soil property graphite&#;Carbon content 80%&#;0.5kg&#; Activated carbon 9.5kg and clay&#;Viscosity is 500mpa.s/30rpm, No. 2 rotors, NDJ-5S digital display viscosimeters&#;15kg is in batch mixer It is middle to mix&#;Progressively adding water to wettability into compound again, to reach that hand is pinched plastic&#;Then feeding coal briquette extruder is pressed into φ 2cmx1cm is oblate&#;Finally 500 DEG C of roasting 3h in sintering furnace, obtain nano iron-carbon micro-electrolytic filler.
Embodiment 3&#;By the reduced iron powder of 325 mesh&#;Iron content &#; 95%&#;60kg, Scaly graphite&#;Carbon content 90%&#;10kg, work Property charcoal 10kg and clay&#;Viscosity is 195mpa.s/30rpm, No. 2 rotors, NDJ-5S digital display viscosimeters&#;20kg is mixed in batch mixer It is even&#;Progressively adding water to wettability into compound again, to reach that hand is pinched plastic&#;Then feeding coal briquette extruder is pressed into φ 6cmx3cm It is oblate&#;Finally 300 DEG C of roasting 2h in sintering furnace, obtain nano iron-carbon micro-electrolytic filler.
Embodiment 4&#;By the reduced iron powder of 200 mesh&#;Iron content &#; 95%&#;60kg, soil property graphite&#;Carbon content 80%&#;It is 15kg, viscous Soil&#;Viscosity is 195mpa.s/30rpm, No. 2 rotors, NDJ-5S digital display viscosimeters&#;15kg is mixed in batch mixer&#;Again to mixing Wettability is progressively added water in material, and to reach that hand is pinched plastic&#;Then feeding coal briquette extruder is pressed into φ 2cmx1cm oblatenesses&#;Finally 400 DEG C of roasting 2h, obtain nano iron-carbon micro-electrolytic filler in sintering furnace.
Test example 1&#;Waste water&#;COD&#;COD&#;For mg/L, pH is 9.8, colourity 500&#;During processing&#;Waste water According to mass ratio it is 2 with the nano iron-carbon fillers of Examples 1 and 2:1, pH is 3.2, reaction time 60-120 min&#;Coordinate Fenton anti- Should, the COD of waste water&#;COD&#;It is reduced to mg/L or so, 160 times of colourity.
Test example 2&#;Turpentine oil waste water&#;CODmg/L, pH1.0&#;During processing&#;Waste water and the Nanoscale Iron of embodiment 3 and 4 Carbon filler mass ratio is 2:1, reaction time 60-120 min&#;The COD of waste water&#;COD&#;Directly it is reduced to mg/ L or so, it is continuous to run ten days without hardened, treatment effect holding stabilization.
Technical scheme is not limited to above-described embodiment, the other embodiments that technique according to the invention scheme is obtained It all should fall within the scope of protection of the present invention.
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