CN101185898B - Method for preparing ceramsite catalyst for ozone catalytic oxidation - Google Patents

Method for preparing ceramsite catalyst for ozone catalytic oxidation Download PDF

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CN101185898B
CN101185898B CN200710032553A CN200710032553A CN101185898B CN 101185898 B CN101185898 B CN 101185898B CN 200710032553 A CN200710032553 A CN 200710032553A CN 200710032553 A CN200710032553 A CN 200710032553A CN 101185898 B CN101185898 B CN 101185898B
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haydite
catalyst
ozone
nuclear
preparation
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CN101185898A (en
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汪晓军
陈思莉
颜述敏
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South China University of Technology SCUT
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Abstract

The invention discloses a preparation method of haydite catalyst for catalytic ozonation. The method comprises the preparation of the haydite raw material nuclear, and the coating and the sintering process of the catalyst on the haydite raw material nuclear. The coating of the catalyst on the haydite raw material is used for crushing one or a plurality of the composite catalyst activity component(s) of MnO, MnO2, TiO2, CoO, Co3O4, Fe2O3, Fe4O3, and FeO into particles with the diameter of 0.1-1mm and being mixed with the raw materials produced by the haydites to produce 3-4mm haydites for coating catalyst. The haydite catalyst for catalytic ozonation is made. After being mixed, the catalyst and the haydite raw material are loaded on the original haydite raw material nuclear with high adhesion strength, and meanwhile the once sintering molding guarantees the high utilization ratio of the catalyst, and the prepared haydite catalyst can be used repeatedly, thus reducing secondary pollutionand operation cost of ozonation.

Description

A kind of preparation method who is used for the ceramsite catalyst of catalytic ozonation
Technical field
The present invention relates to the catalytic ozonation catalyst, be specifically related to a kind of preparation method who is used for the ceramsite catalyst of catalytic ozonation.Use this ceramsite catalyst and can improve ozone, thereby handle waste water, contaminated source water efficiently, particularly contain the waste water of refractory organic organic oxidation efficiency in the waste water.
Background technology
Ozone has extremely strong oxidation susceptibility, and its oxidability is only second to fluorine, is higher than chlorine and potassium permanganate.Based on the strong oxidizing property of ozone, but and in water, decompose voluntarily in the short time, there is not secondary pollution, be desirable water treatment green oxidation medicament.
At present, obtained application aspect ozone technology many in water treatment field.Ozone not only has very strong sterilization, the little pollution organic substance in all right oxidation removal water, and these micropollutants are difficult to biodegradable often, and ozone oxidation is comparatively thorough, less generation accessory substance.And when in the traditional water treatment process, using chlorine or clorox as disinfectant and oxidant, can produce some poisonous and hazardous DBPs, as organic halogens such as chloroforms, that many research reports proof organic halogens have is carcinogenic, teratogenesis, mutagenic effect.
Adopting the fine or not key of ozonation technology effect is the oxidability of ozone and the use amount of ozone.Traditional ozonation technology is lower to the utilization rate of ozone, thereby lower to the hardly degraded organic substance clearance.Therefore, ozone is carried out catalysis, improve the oxidation utilization rate of ozone, it is the focus of studying at present that its oxidability is improved.At present the ozone catalytic agent of reported in literature is based on homogeneous phase, and promptly the catalyst wiring solution-forming adds in the waste water, feeds ozone then and carries out catalytic reaction, and catalyst is that the form with ionic state exists.Though this liquid catalyst can improve the oxidability of ozone, exist catalyst to reuse, easily cause secondary pollution, increase the shortcomings such as difficulty of subsequent treatment.And can manufacture a kind of catalyst of solid, make its oxidation that catalytic action preferably be arranged to the ozone in the waste water, in the process of water treatment, these solid catalysts are retained in always and play catalysed oxidn in the ozone catalytic reactor, do not need follow-up separating measure, its actual application value will be arranged.
The preparation of at present heterogeneous ozone catalytic agent, the method that is adopted is, one or more are compound by a certain percentage soluble in water will to have the metal nitrate of catalytic activity or sulfate, add carrier then, add alkaline matter, make these metallic salts form precipitation of hydroxide.Mix then, the washing and filtering carrier, baking is at last fired and is equipped with, because such preparation method is attached to carrier surface with catalyst, there is a large amount of byproducts of reaction in the preparation process, can't need removes by washing attached to the catalyst of carrier surface in a large number simultaneously, cause bigger waste.In addition and since catalyst be by baking attached to carrier surface, so its adhesive strength is relatively poor, repeatedly uses the turnover rate of rear catalyst bigger, and because such production method complex steps, difficultly realizes large-scale industrial production.
Summary of the invention
The objective of the invention is to overcome the shortcoming of prior art, has the solid constituent of catalytic activity as its raw materials for production by in the haydite production process, adding, the ceramsite catalyst that the preparation catalytic ozonation is used, to improve the ozone oxidation ability, and improve the hardly degraded organic substance ability in the water of removing, reduce the operating cost of ozone oxidation water treatment.
Purpose of the present invention is achieved through the following technical solutions:
A kind of preparation method who is used for the ceramsite catalyst of catalytic ozonation comprises the steps and process conditions:
(1) gets the raw materials ready and the preparation of haydite materials nuclear: flyash, kaolin and swelling agent is standby as the haydite raw materials for production, and part haydite raw materials for production are prepared the haydite materials nuclear that particle diameter is 1-1.5mm by the sugar-coat draft machine, described swelling agent is an Almasilate;
(2) catalyst is to the coating of haydite materials nuclear: with MnO, MnO 2, TiO 2, CoO, Co 3O 4, Fe 2O 3Being ground into particle diameter with one or more compound catalyst activity compositions among the FeO is 0.1-1mm, mixes with the haydite raw materials for production of step (1), and mixture is loaded on the haydite materials nuclear, generates the haydite of the coated catalysts of 3-4mm; The weight that described catalyst activity composition accounts for total production haydite materials is 5%-30%;
(3) sintering: the haydite of step (2) coated catalysts at 1000-1200 ℃ of sintering, is made the ceramsite catalyst that is used for catalytic ozonation.
For further realizing purpose of the present invention, the particle diameter of described haydite raw materials for production is 1-3mm.Described catalyst activity composition is MnO, MnO 2, TiO 2, CoO or Co 3O 4In one or more.Described sintering temperature is 1100-1200 ℃.By weight percentage, described flyash, kaolin and swelling agent respectively account for the ratio of haydite raw materials for production and are: 45~60%, 25~40%, 15~20%.
Flyash, kaolin, swelling agent are the haydite raw materials for production of using always.
The catalyst active component that is used for catalytic ozonation is MnO, MnO 2, TiO 2, CoO, Co 3O 4, Fe 2O 3, one or more are compound among the FeO, the carrier of catalyst is a haydite.MnO, MnO 2, TiO 2, CoO, Co 3O 4, Fe 2O 3, one or more kinds raw material (flyash, kaolin, swelling agent) compound and that produce haydite mixes among the FeO, loads on securely on the little haydite nuclear of not baking again, finally baking molding together prepares ozone oxidation catalyst.This catalyst had both played the effect that improves the ozone oxidation ability when carrying out catalytic reaction, be difficult for again running off and cause secondary pollution to waste water.
Have following advantage and beneficial effect with respect to prior art the present invention:
The present invention utilizes conventional production method to make haydite nuclear earlier, can improve its intensity, has saved the consumption of producing the catalyst raw material simultaneously, has reduced production cost.The solid-state ceramsite catalyst of the present invention's preparation, because catalyst and haydite materials mixing back loading are on original haydite materials nuclear, because its material is close, so its adhesive strength height, by once sintered moulding, guaranteed the high usage of this catalyst simultaneously, the ceramsite catalyst of preparation can be reused, thereby the minimizing secondary pollution reduces ozone oxidation operating cost.Simultaneously catalyst has been saved the production stage and the production cost of general ozone heterogeneous catalysis as one of raw material of haydite preparation, can realize large-scale industrial production.
This invention can be handled water separately, also can with the additive method coupling.Ozone can more effectively be removed organic pollution in the water through after the catalyst, and its oxidability is significantly improved, thereby has reduced the dosage of ozone, has saved operating cost; By catalyst is contained the haydite of catalyst activity component as the feedstock production top layer of carrier haydite, can greatly improve catalyst utilization, reduce catalyst production cost, reduce the catalyst loss rate, prevent secondary pollution.
The specific embodiment
In order to understand technical characterstic of the present invention better,, need to prove that embodiment is not a limiting the scope of the invention below in conjunction with the present invention being further described by embodiment.
Embodiment 1
The raw material that utilizes flyash, kaolin, swelling agent to produce as haydite earlier, swelling agent is an Almasilate, prepares the haydite materials nuclear that particle diameter is 1-1.5mm by the sugar-coat draft machine.By weight percentage, the ratio that flyash, kaolin and swelling agent respectively account for is: 50%, 35%, 15%.In the raw material of preparation haydite, add the MnO that accounts for its raw materials mixed weight 10% again 2With 10%Fe 2O 3, it is 0.1-1mm that these two kinds of metal oxides are crushed to particle diameter, mixes.Re-using model is YK60-160 sugar-coat draft machine, mixture is wrapped in not securely on the little haydite nuclear of baking, generates the not haydite of barbecue of 3-4mm, final baking molding together, and the condition that baking is burnt is 1000 degree, prepares ozone oxidation catalyst.Utilize the daily wastewater from chemical industry of ozone oxidation advanced treating, the ozone dosage is O 3: COD=0.5: 1, COD is reduced to 90mg/L by original 120mg/L, adds ozone catalytic agent catalysis, and under same ozone dosage, COD drops to 60mg/L, and treatment effeciency improves 25%.
Embodiment 2
The raw material that utilizes flyash, kaolin, swelling agent to produce earlier as haydite, swelling agent is an Almasilate, by model is that YK60-160 sugar-coat draft machine prepares the haydite materials nuclear that particle diameter is 1.5-2mm, by weight percentage, the ratio that flyash, kaolin and swelling agent respectively account for is: 60%, 25%, 15%.At raw material nuclear before baking is burnt, in the raw material of preparation haydite, add to account for and be respectively 5% MnO, MnO with its raw materials mixed 2, TiO 2, CoO, Co 3O 4, these four kinds of metal oxides are ground into Powdered, mix.Re-use the sugar-coat draft machine, mixture is wrapped in not securely on the little haydite nuclear of baking, generate the not haydite of barbecue of 4-5mm, final baking molding together, the condition that baking is burnt is 1100 degree, prepares ozone oxidation catalyst.Utilize ozone Oxidation Treatment chemical plant phenol wastewater, the ozone dosage is O 3: phenol=1, COD is reduced to 340mg/L by original 540mg/L, adds ozone catalytic agent catalysis, and under same ozone dosage, COD drops to 160mg/L, and treatment effeciency improves 35%.
Embodiment 3
The raw material that utilizes flyash, kaolin, swelling agent to produce earlier as haydite, swelling agent is that Almasilate is that YK60-160 sugar-coat draft machine prepares the haydite materials nuclear that particle diameter is 2-2.5mm by model, by weight percentage, the ratio that flyash, kaolin and swelling agent respectively account for is: 45%, 40%, 20%.At raw material nuclear before baking is burnt, in the raw material of preparation haydite, add to account for and be respectively 15% MnO with its raw materials mixed 2, Co 3O 4, Fe 2O 3These three kinds of metal oxides are pulverized, mixed.Re-use the sugar-coat draft machine, it is wrapped on little haydite nuclear of end baking securely, generate the not haydite of barbecue of 5-8mm, final baking molding together, the condition that baking is burnt is 1200 degree, prepares ozone oxidation catalyst.Utilize ozone Oxidation Treatment harbour washing of tanks waste water, the ozone dosage is O3: COD=1, and COD is reduced to 1200mg/L by original 1600mg/L, add ozone catalytic agent catalysis, under same ozone dosage, COD drops to 900mg/L, and treatment effeciency improves 19%.
Ozone oxidation catalyst in the foregoing description carries out organic pollution in the O3 catalytic oxidation water by joining in the ozone catalytic reaction unit.The ozone catalytic reaction unit is by water distribution system, catalytic reaction layer, outlet system, tail gas absorber is formed, wherein water distribution system is realized by water-locator is set above the filter plate, be full of solid-phase catalyst above the filter plate and form catalytic reaction layer, outlet system loads filter screen and makes that the carrier of band catalyst is not taken out of, and tail gas absorber is collected reaction back residual ozone.The ozone of collecting can be used in other oxidation operation, if ozone is not recycled, then by the ozone tail gas destructor ozone is handled, and pollutes to prevent that ozone from overflowing.Its technological process is that ozone makes air water mix via gas absorber earlier, enter the ozone catalytic reaction unit then, through water distribution system, make water fully contact with ozone, catalyst, catalyst ozone oxidation water pollutant then, improve the removal ability of ozone, thereby save the ozone dosage, reduce water treatment operating cost pollutant.
The ozone catalytic reactor can be divided into two kinds of up flow type (water from the bottom up flow) and downflow systems (water is mobile from top to bottom) according to water (flow) direction, can adjust according to actual engineering.
The technological parameter of this catalytic reactor is as follows: catalyst is full of catalyst reaction device, reserves the protection height of 0.2-1m above, is beneficial to the expansion of up flow type reaction time catalizer layer; Waste water and ozone enter catalytic reactor rapidly after mixing, with time of contact of catalyst be 5~60min.
The material of reactor is made with the material of anti-ozone corrosion, as stainless steel, glass, polytetrafluoroethylene (PTFE) etc.
As mentioned above, can realize the present invention preferably.

Claims (3)

1. preparation method who is used for the ceramsite catalyst of catalytic ozonation is characterized in that comprising the steps and process conditions:
(1) get the raw materials ready and the preparation of haydite materials nuclear: flyash, kaolin and swelling agent is standby as the haydite raw materials for production, and part haydite raw materials for production are prepared the haydite materials nuclear that particle diameter is 1-1.5mm by the sugar-coat draft machine; Described swelling agent is an Almasilate;
(2) catalyst is to the coating of haydite materials nuclear: with MnO, MnO 2, TiO 2, CoO, Co 3O 4, Fe 2O 3Being ground into particle diameter with one or more compound catalyst activity compositions among the FeO is 0.1-1mm, mixes with the haydite raw materials for production of step (1), and mixture is loaded on the haydite materials nuclear, generates the haydite of the coated catalysts of 3-4mm; The weight that described catalyst activity composition accounts for total production haydite materials is 5%-30%;
(3) sintering: the haydite of step (2) coated catalysts at 1000-1200 ℃ of sintering, is made the ceramsite catalyst that is used for catalytic ozonation.
2. the preparation method who is used for the ceramsite catalyst of catalytic ozonation according to claim 1 is characterized in that described catalyst activity composition is MnO, MnO 2, TiO 2, CoO or Co 3O 4In one or more.
3. the preparation method who is used for the ceramsite catalyst of catalytic ozonation according to claim 1, it is characterized in that by weight percentage, the ratio that described flyash, kaolin and swelling agent respectively account for the haydite raw materials for production is: 45~60%, 25~40%, 15~20%.
CN200710032553A 2007-12-14 2007-12-14 Method for preparing ceramsite catalyst for ozone catalytic oxidation Expired - Fee Related CN101185898B (en)

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