CN107159257A - The preparation method of ozone Heterogeneous oxidation solid catalyst - Google Patents

The preparation method of ozone Heterogeneous oxidation solid catalyst Download PDF

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CN107159257A
CN107159257A CN201710277067.3A CN201710277067A CN107159257A CN 107159257 A CN107159257 A CN 107159257A CN 201710277067 A CN201710277067 A CN 201710277067A CN 107159257 A CN107159257 A CN 107159257A
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weight
solid catalyst
ozone heterogeneous
heterogeneous oxidation
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朱明�
江燕妮
岳馥莲
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Sichuan Normal University
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    • B01J23/8933Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with noble metals also combined with metals, or metal oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
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    • B01J20/02Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
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    • B01J37/00Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/34Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation
    • B01J37/341Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of electric or magnetic fields, wave energy or particle radiation
    • B01J37/343Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of electric or magnetic fields, wave energy or particle radiation of ultrasonic wave energy

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Abstract

The present invention relates to a kind of preparation method of ozone Heterogeneous oxidation solid catalyst, category environmental protection and technical field of chemical engineering catalysts.With medical stone, wollastonite, activated carbon, carnallite, illite and raphite make carrier, carrier is modified through lithium hypochlorite and double (acetylacetone,2,4-pentanedione) beryllium reamings, add surfactant myristyl tributyl ammonium chloride and surface activation process is carried out under ul-trasonic irradiation, then activated carrier in hydrothermal reaction kettle with composite mineralizer borax and potassium sulfate, catalytic activity auxiliary agent predecessor isopropyl scandium oxide (III), three (4, 4, (2 thiophene) 1 of 4 trifluoro 1, 3 diacetyl) europium, three (2, 2, 6, 6 tetramethyls 3, 5 heptadione acid) gadolinium, ten water holmium oxalates, catalytic active center component predecessor titanocenes ring substituted salicylic acid complex, cupric glutamate, chlordene osmium dipotassium, the ammino platinum of dichloro two, hydro-thermal reaction is carried out under the effect of emulsifying agent didodecyldimethylammbromide bromide, drying removes moisture, calcination obtains ozone Heterogeneous oxidation solid catalyst in Muffle furnace.

Description

The preparation method of ozone Heterogeneous oxidation solid catalyst
Technical field
The present invention relates to a kind of preparation method of ozone Heterogeneous oxidation solid catalyst, category environmental protection and chemical catalyst skill Art field.
Background technology
Ozonation technology using ozone oxidation ability it is strong the characteristics of, can be by many organic pollution oxidation Decompositions, extensively For wastewater treatment.Catalytic ozonation technology is divided into ozone homogeneous catalytic oxidation and ozone heterogeneous catalytic oxidation, and ozone is equal Phase catalysis oxidation has that the more difficult separation and recovery of catalyst is reused, ozone utilization rate is low causes water process operating cost higher, Organic pollutant removal rate is relatively low simultaneously and easily causing secondary pollution of water is limited to its application;Ozone heterogeneous catalysis oxygen There is change technology catalyst to be easily isolated and recycled and reusable, ozone utilization rate is high, organic pollutant removal rate is higher, drop Low water process operating cost and receive significant attention its application the advantages of do not result in secondary pollution.Ozone heterogeneous catalysis It is to reach local organic matter enrichment by catalyst surface absorption organic matter that oxidation of organic compounds, which is decomposed, while ozone molecule absorption exists The hydroxyl radical free radical that catalyst surface produces high activity under catalyst action decomposes organic matter.Ozone heterogeneous catalytic oxidation Handle in waste water technology, core technology is the preparation of ozone Heterogeneous oxidation solid catalyst.
Ozone Heterogeneous oxidation solid catalyst is generally made up of carrier, activated centre and auxiliary agent.Due to being polluted in waste water Species are various, complex chemical composition feature, can produce harmful effect to performance such as absorption, the mithridatism of catalyst. Prepare that the carrier structure that ozone Heterogeneous oxidation solid catalyst uses is more single at present, adsorptivity is relatively low;Activated centre is universal Using normal transition metal salt, mithridatism is poor;Preparation method mainly has infusion process, the precipitation method, mixing method and collosol and gel etc. Method attachment activity center and adjuvant component are easily liquated out in carrier surface, activated centre and adjuvant component, cause catalyst Easily lose catalytic activity.For exist in current ozone Heterogeneous oxidation solid catalyst preparation method Catalyst Adsorption compared with Low, mithridatism is poor and easily loses catalytic activity problem, and exploitation is strengthened using multicomponent porous carrier through reaming, surface active Catalyst Adsorption, makees catalytic activity auxiliary agent predecessor, normal transition Organometallic using rare earth organo-metallic compound and closes Thing and precious metal chemical complex are made catalytic active center predecessor and contained with multicomponent porous carrier through hydro-thermal reaction, high temperature sintering preparation The ozone Heterogeneous oxidation solid catalyst of multi-element metal has to improve the preparation method of catalyst mithridatism and catalytic activity Larger environmental benefit and higher practical value.
The content of the invention
For existing in current ozone Heterogeneous oxidation solid catalyst preparation method, Catalyst Adsorption is relatively low, mithridatism Poor to lose catalytic activity problem with easy, exploitation strengthens catalyst using multicomponent porous carrier through reaming, surface active Adsorptivity, catalytic activity auxiliary agent predecessor, normal transition metallo-organic compound and expensive are made using rare earth organo-metallic compound Metallic compound is made catalytic active center predecessor and prepared with multicomponent porous carrier through hydro-thermal reaction, high temperature sintering containing polynary gold The ozone Heterogeneous oxidation solid catalyst of category to improve the preparation method of catalyst mithridatism and catalytic activity, it is characterized in that Component A can be added in closed reactor and deionized water stirring prepares the aqueous solution, the weight concentration for control component A is 2%~6%, After the completion of prepared by solution, B component is added under agitation, 35 DEG C~50 DEG C are warming up to, continues stirring reaction 3h~6h, is filtered, instead Product is answered to obtain reaming modified support after 102 DEG C~106 DEG C dry constant weights;Reaming modified support puts into ultrasound reactor, The aqueous solution prepared by component C and deionized water is added, the weight concentration of component C is 3%~8%, is uniformly mixed, and control is super Sound power density is 0.3~0.8W/m3, frequency 20kHz~30kHz, 40 DEG C~55 DEG C, sonic oscillation 2h~5h obtains ultrasound Surface active carrier mixed liquor;Ultrasonic surface activated carrier mixed liquor is transferred in hydrothermal reaction kettle, add D components and go from The aqueous solution that sub- water is prepared, the weight concentration of D components is 40%~55%, by weight, D component deionized water solutions:Ultrasonic table Weight ratio=1 of face activated carrier mixed liquor:(1.5~2), control 120 DEG C~180 DEG C of temperature, the hydro-thermal reaction time be 8h~ 16h, then dries to obtain fine particle;Fine particle is in Muffle furnace, 600 DEG C~950 DEG C, and calcination 3h~8h obtains ozone non- Homogeneous oxidizing solid catalyst.The component A is made up of lithium hypochlorite, double (acetylacetone,2,4-pentanedione) berylliums, by weight, lithium hypochlorite: Weight ratio=1 of double (acetylacetone,2,4-pentanedione) berylliums:(1~1.6), B component is by medical stone, wollastonite, activated carbon, carnallite, illite , raphite composition, by weight, medical stone:Wollastonite:Activated carbon:Carnallite:Illite:The weight of raphite it Than=(5~15):(7~17):(9~19):(11~21):(13~23):(15~25), by weight, component A:B component Weight ratio=1:(10~20), component C is myristyl tributyl ammonium chloride, by weight, component C:Reaming modified support Weight ratio=1:(5~10), D components are by composite mineralizer borax, potassium sulfate, catalytic activity auxiliary agent predecessor isopropyl scandium oxide (III), three (4,4,4- tri- fluoro- 1- (2- thiophene) -1,3- diacetyl) europiums, three (DPM dpm,dipivalomethane acid) Gadolinium, ten water holmium oxalate Rare-earth chemicals, the cyclopentadienyl of catalytic active center predecessor normal transition metallo-organic compound two Titanacycle substituted salicylic acid complex, cupric glutamate and precious metal chemical complex chlordene osmium dipotassium, the ammino platinum of dichloro two, emulsifying agent double ten Dialkyl dimethyl ammonium bromide is constituted, by weight, borax:Potassium sulfate:Isopropyl scandium oxide (III):Three (the fluoro- 1- of 4,4,4- tri- (2- thiophene) -1,3- diacetyl) europium:Three (DPM dpm,dipivalomethane acid) gadoliniums:Ten water holmium oxalates:Titanocenes ring Substituted salicylic acid complex:Cupric glutamate:Chlordene osmium dipotassium:The ammino platinum of dichloro two:The weight of didodecyldimethylammbromide bromide The ratio between amount=(4~8):(6~10):(3~6):(4~7):(5~8):(6~9):(10~15):(12~18):(4~7):(6 ~9):(6~20).Medical stone, wollastonite, activated carbon, carnallite, illite, the raphite of B component carry out powder respectively Broken, deionized water washing, which is dried, to be removed after moisture, and -200 mesh ,+400 mesh sieves point are carried out through standard screen, controls the particle diameter to be The mm of 0.0370mm~0.0750.
What the technical method of the present invention was realized in:Lithium hypochlorite LiClO, double (second can be being added in closed reactor Acyl acetone) beryllium C10H14BeO4The aqueous solution is prepared with deionized water stirring, it is 0.0370mm~0.0750mm to add particle diameter after screening Medical stone, wollastonite, activated carbon, carnallite, illite and raphite porous material carrier, in certain temperature and stirring bar Under part, the small Be of aqueous solution Ionic Radius2+(0.31Å)、Li+(0.60Å)Displace part ion radius in porous material big Ca2+(0.99Å)、K+(1.33Å)、Ba2+(1.35Å)Plasma, the aperture of porous material carrier becomes big, surface roughness increasing Plus, filtering dries the reaming modified support input ultrasound reactor after constant weight, adds myristyl tributyl ammonium chloride C14H29N+(C4H9)3Cl- The aqueous solution, control ultrasonic power density, ultrasonic frequency, temperature and sonic oscillation time, in ultrasound Under ripple cavitation, myristyl tributyl ammonium chloride C14H29N+(C4H9)3Cl- It is easy to escape into reaming modification from the aqueous solution Carrier duct is attached to reaming modified support surface, is beneficial to being interconnected and carrier surface activation for carrier duct, enhancing Adsorptivity;After the completion of ultrasonic activation, ultrasonic surface activated carrier mixed liquor is transferred in hydrothermal reaction kettle, with borax Na2B4O7·10H2O, potassium sulfate K2SO4Composite mineralizer, catalytic activity auxiliary agent predecessor isopropyl scandium oxide (III) C9H21O3Sc、 Three (4,4,4- tri- fluoro- 1- (2- thiophene) -1,3- diacetyl) europium C24H18EuF9O6S3, three (2,2,6,6- tetramethyls -3,5- heptan two Ketone acid) gadolinium C33H57GdO6, ten water holmium oxalate C6Ho2O12Rare-earth chemicals, the common mistake of catalytic active center predecessor Cross metallo-organic compound titanocenes ring substituted salicylic acid complex (C10H10)Ti(C7H4O3), cupric glutamate C5H7NO4Cu and six Chlorine osmium dipotassium K2OsCl6, the ammino platinum Pt (NH of dichloro two3)2Cl2Precious metal chemical complex, in the double dodecyl dimethyl bromines of emulsifying agent Change ammonium [(C12H25)2N(CH3)2]+Br-Effect is lower to carry out hydro-thermal reaction, and mineralizer accelerates diffusion, reactant lattice is lived Change, promote the progress of solid phase reaction, ultrasonic surface activated carrier and Rare-earth chemicals, normal transition organic metal Compound, precious metal chemical complex Uniform Doped, it is quasi-stationary that emulsifying agent didodecyldimethylammbromide bromide forms reaction solution Emulsion prevents separation of solid and liquid, sedimentation, while to the further surface active of porous carrier, passing through the water in certain temperature, time Thermal response, drying obtains the fine silt thing of Uniform Doped;The fine silt thing of Uniform Doped is in Muffle furnace, through high temperature sintering, its In organic matter carbonization further enhance the microcellular structure of porous carrier, obtain the oxidation of porous carrier supported rare earth metal The ozone Heterogeneous oxidation solid catalyst of the catalytic active center of thing, transition metal oxide and noble metal formation, is improved The mithridatism and catalytic activity of catalyst.
Relative to art methods, outstanding feature of the present invention is that medical stone, wollastonite, activity are used in technology of preparing Charcoal, carnallite, illite, raphite porous material make carrier, due to lithium hypochlorite LiClO and double (acetylacetone,2,4-pentanedione) berylliums C10H14BeO4Reaming effect, myristyl tributyl ammonium chloride C14H29N+(C4H9)3Cl-, didodecyldimethylammbromide bromide [(C12H25)2N(CH3)2]+Br- To being interconnected and surface activation for duct;Rare earth organic metal is made by hydro-thermal reaction Compound, normal transition metallo-organic compound and precious metal chemical complex reach Uniform Doped and are attached to carrier surface and duct Interior, high temperature sintering makes organic matter carbonization strengthen and form multi-level microcellular structure, porous carrier supported rare earth metal The multi-element metal catalytic active center of oxide, transition metal oxide and noble metal formation is combined more firm with porous carrier Gu, the ozone Heterogeneous oxidation solid catalyst of preparation has a stronger adsorptivity, the cooperative effect of multi-element metal, particularly mixes Stability and high activity that miscellaneous noble metal has, can suppress liquating out for metal catalytic activity component, improve catalyst Mithridatism and catalytic activity, with good environmental benefit and economic benefit.
Embodiment
Embodiment 1:1.35g lithium hypochlorites, double (acetylacetone,2,4-pentanedione) berylliums of 1.65g, 140ml deionized waters are added to volume for 500ml Can be uniformly mixed in closed reactor, the weight concentration of the aqueous solution is 2.1%, lithium hypochlorite:Double (acetylacetone,2,4-pentanedione) berylliums Weight ratio=1:1.2;Add deionized water wash to it is neutral, 103 DEG C dry and remove the mesh of -200 mesh of sieving after moisture~+400 2.75g medical stones, 3.75g wollastonites, 4.75g activated carbons, 5.75g carnallites, 6.75g illites, the 7.75g sodium boron of standard screen The weight of Xie Shi, lithium hypochlorite and double (acetylacetone,2,4-pentanedione) berylliums(3g):The weight of porous material(31.5g)=1:10.5, it is warming up to 36 DEG C, obtain reaming modified support 31g after continuing stirring reaction 3.2h, filtering, 103 DEG C of dry constant weights;In 500ml ultrasonic responses In device, reaming modified support 31g is put into, the water that 3.25g myristyl tributyl ammonium chlorides are dissolved in 100ml deionized waters is added Solution, the weight concentration of the aqueous solution is 3.1%, is uniformly mixed, myristyl tributyl ammonium chloride(3.25g):Reaming Modified support(31g )=1:9.5;It is 0.4 W/m to control ultrasonic power density3, ultrasonic frequency 21kHz, 41 DEG C of temperature, ultrasound Vibrate 2.2h;After the completion of ultrasonic activation, the ultrasonic surface activated carrier mixed liquor in ultrasound reactor is transferred to 500ml water In thermal response kettle, add by 2.1g boraxs, 3.05g potassium sulfates, 1.6g isopropyls scandium oxide (III), 2.05g tri- (4,4,4- tri- Fluoro- 1- (2- thiophene) -1,3- diacetyl) europium, 2.6g tri- (DPM dpm,dipivalomethane acid) gadolinium, the water of 3.05g ten Holmium oxalate, 5.05g titanocenes ring substituted salicylic acids complex, 6.1g cupric glutamates, 2.05g chlordene osmiums dipotassium, 3.1g dichloros two The aqueous solution that ammino platinum, 3.05g didodecyldimethylammbromide bromides and 50ml deionized waters are prepared, the weight of the aqueous solution Concentration is 40.3%, the weight of the aqueous solution:Weight=83.8g of ultrasonic surface activated carrier mixed liquor:134.25g =1:1.6, 125 DEG C of temperature is controlled, the hydro-thermal reaction time is 8.3h, then dries to obtain fine silt thing for 105 DEG C;Fine silt thing in Muffle furnace, 620 DEG C, calcination 3.2h after cooling down, can obtain the ozone Heterogeneous oxidation solid catalyst of fine particle shape.
Embodiment 2:0.24g lithium hypochlorites, double (acetylacetone,2,4-pentanedione) berylliums of 0.36g, 10ml deionized waters, being added to volume is 100ml's can be uniformly mixed in closed reactor, and the weight concentration of the aqueous solution is 5.7%, lithium hypochlorite:Double (levulinics Ketone) beryllium weight ratio=1:1.5;Add deionized water wash to it is neutral, 103 DEG C dry remove -200 mesh of sieving after moisture~+ The 1.45g medical stones of 400 mesh standard sieves, 1.65g wollastonites, 1.85g activated carbons, 2.05g carnallites, 2.25g illites, The weight of 2.45g raphites, lithium hypochlorite and double (acetylacetone,2,4-pentanedione) berylliums(0.6g):The weight of porous material(11.7g)=1: 19.5,48 DEG C are warming up to, reaming modified support 11.5g is obtained after continuing stirring reaction 5.8h, filtering, 105 DEG C of dry constant weights; In 100ml ultrasound reactors, reaming modified support 11.5g is put into, 2.2g myristyl tributyl ammonium chlorides is added and is dissolved in The aqueous solution of 26ml deionized waters, the weight concentration of the aqueous solution is 7.8%, is uniformly mixed, myristyl tributyl chlorination Ammonium(2.2g):Reaming modified support(11.5g )=1:5.2;It is 0.7 W/m to control ultrasonic power density3, ultrasonic frequency 54 DEG C of 29kHz, temperature, sonic oscillation 4.7h;After the completion of ultrasonic activation, the ultrasonic surface activated carrier in ultrasound reactor Mixed liquor is transferred in 100ml hydrothermal reaction kettles, is added by 0.78g boraxs, 0.97g potassium sulfates, 0.58g isopropyl scandium oxides (III), 0.67g tri- (4,4,4- tri- fluoro- 1- (2- thiophene) -1,3- diacetyl) europium, (2,2,6,6- tetramethyls -3,5- of 0.78g tri- Heptadione acid) gadolinium, the water holmium oxalates of 0.87g ten, 1.48g titanocenes ring substituted salicylic acids complex, 1.77g cupric glutamates, 0.68g chlordene osmiums dipotassium, the ammino platinum of 0.87g dichloros two, 1.98g didodecyldimethylammbromide bromides and 10ml deionized waters The aqueous solution of preparation, the weight concentration of the aqueous solution is 53.3%, the weight of the aqueous solution:Ultrasonic surface activated carrier mixed liquor Weight=21.43g:39.7g =1:1.9,175 DEG C of temperature is controlled, the hydro-thermal reaction time is 15.5h, is then dried for 105 DEG C Fine silt thing;Fine silt thing is in Muffle furnace, 930 DEG C, calcination 7.5h, after cooling down, can obtain the ozone of fine particle shape Heterogeneous oxidation solid catalyst.
Comparative example 1:Preparation process is not added with lithium hypochlorite, double (acetylacetone,2,4-pentanedione) berylliums, myristyl tributyl ammonium chloride, double Outside Dodecydimethylammonium bronides, borax and potassium sulfate, whole preparation process, preparation condition are identical with embodiment 1.
The parameter of ozone Heterogeneous oxidation solid catalyst prepared by embodiment 1, embodiment 2 and comparative example 1 is included in table 1.
Application Example 1:Ozone Heterogeneous oxidation solid catalyst point prepared by embodiment 1, embodiment 2 and comparative example 1 The waste water progress ozone for being used for ethylenediamine, 4,4 '-diaminourea acardite and the preparation of para hydroxybenzene propionic acid under the same conditions is non- Homogeneous oxidizing processing.Treatment conditions are:Rate of charge=1000L of organic wastewater and catalyst:1g, organic wastewater CODCrValue 976.0mg/L, ozone dosage 80mg/L, processing time 1hr, ozone tail gas KI solution absorption detecting ozone utilization rates.Examination Test data and be included in table 2.
The embodiment of table 1 and comparative example prepare ozone Heterogeneous oxidation solid catalysis agent parameter
The ozone Heterogeneous oxidation solid catalyst Application Example of table 2

Claims (2)

1. a kind of preparation method of ozone Heterogeneous oxidation solid catalyst, it is characterized in that A groups can added in closed reactor Divide and deionized water stirring prepares the aqueous solution, the weight concentration for controlling component A is 2%~6%, after the completion of prepared by solution, in stirring Lower addition B component, is warming up to 35 DEG C~50 DEG C, continues stirring reaction 3h~6h, and filtering, reaction product is dry at 102 DEG C~106 DEG C Reaming modified support is obtained after dry constant weight, reaming modified support input ultrasound reactor, addition is matched somebody with somebody by component C and deionized water The aqueous solution of system, the weight concentration of component C is 3%~8%, is uniformly mixed, and it is 0.3~0.8W/ to control ultrasonic power density m3, frequency 20kHz~30kHz, 40 DEG C~55 DEG C, sonic oscillation 2h~5h obtains ultrasonic surface activated carrier mixed liquor, transfer Into hydrothermal reaction kettle, the aqueous solution that D components and deionized water are prepared is added, the weight concentration of D components is 40%~55%, is pressed Weight meter, D component deionized water solutions:Weight ratio=1 of ultrasonic surface activated carrier mixed liquor:(1.5~2), control temperature 120 DEG C~180 DEG C, the hydro-thermal reaction time is 8h~16h, then dries to obtain fine silt thing, fine silt thing is in Muffle furnace, 600 DEG C~950 DEG C, calcination 3h~8h obtains ozone Heterogeneous oxidation solid catalyst;The component A is by lithium hypochlorite, double (acetyl Acetone) beryllium composition, by weight, lithium hypochlorite:Weight ratio=1 of double (acetylacetone,2,4-pentanedione) berylliums:(1~1.6), B component is by wheat meal Stone, wollastonite, activated carbon, carnallite, illite, raphite composition, by weight, medical stone:Wollastonite:Activated carbon:Light Halogen stone:Illite:The weight ratio of raphite=(5~15):(7~17):(9~19):(11~21):(13~23):(15 ~25), by weight, component A:Weight ratio=1 of B component:(10~20), component C is myristyl tributyl ammonium chloride, By weight, component C:Weight ratio=1 of reaming modified support:(5~10), D components by composite mineralizer borax, potassium sulfate, Catalytic activity auxiliary agent predecessor isopropyl scandium oxide (III), three (4,4,4- tri- fluoro- 1- (2- thiophene) -1,3- diacetyl) europiums, three (2,2,6,6- tetramethyl -3,5- heptadione acid) gadolinium, ten water holmium oxalate Rare-earth chemicals, catalytic active center forerunner Thing normal transition metallo-organic compound titanocenes ring substituted salicylic acid complex, cupric glutamate and precious metal chemical complex chlordene osmium Dipotassium, the ammino platinum of dichloro two, emulsifying agent didodecyldimethylammbromide bromide composition, by weight, borax:Potassium sulfate:Isopropyl Scandium oxide (III):Three (4,4,4- tri- fluoro- 1- (2- thiophene) -1,3- diacetyl) europiums:Three (2,2,6,6- tetramethyls -3,5- heptan Two ketone acids) gadolinium:Ten water holmium oxalates:Titanocenes ring substituted salicylic acid complex:Cupric glutamate:Chlordene osmium dipotassium:The ammino of dichloro two Platinum:The weight ratio of didodecyldimethylammbromide bromide=(4~8):(6~10):(3~6):(4~7):(5~8):(6~ 9):(10~15):(12~18):(4~7):(6~9):(6~20).
2. B component is by medical stone, wollastonite, activated carbon, carnallite, illite, raphite group according to claim 1 Into medical stone, wollastonite, activated carbon, carnallite, illite, raphite are crushed respectively, and deionized water washing drying is removed Go after moisture, sieved through standard screen, it is 0.0370mm~0.0750mm to control particle diameter.
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