The research of be mingled with of the pottery and porcelain in powder of alloy of high temperature of electrostatic and detached purify

[keyword] : Field trash of pottery and porcelain of; of powder of alloy of high temperature of electrostatic and detached; [summary] : In the powder of high temperature alloy that the mix into of Al2 O3 grain that is size range M of μ of 10 0 of 5 0 ～ with artificial method enters size range to be M of μ of 10 0 of 5 0 ～ , electrostatic to mixing powder to undertake depart (after ESS) , detect with stereomicroscope the purify effect of Al2 O3 grain. Consider to make clear, the effect of grain of ESS purify Al2 O3 is distinct, craft parameter is different, ESS purify effect is distinct also. When roller canister rotate speed is certain, as corona extremely of voltage elevatory, purify effect enhances; when corona pole tension is constant, rotate speed of the canister that follow roller reduces purify effect to also increase. Experimental result and theory analyse photograph be identical. Below this experimental condition, is the optimal craft parameter of ESS: ? ?0kV of Miao of  of entangled short for Weihe River, 5 0r/min of roller canister rotate speed. The amount of the field trash in powder of alloy of 1 introductive high temperature and dimension affect the intensity of its goods and service life directly. So, get high pure powder of clean high temperature alloy is very necessary. Plasma rotates electrode craft (PREP) the field trash in making powder of extraction high temperature alloy basically originates mother alloy club expects, namely field trash basically is mixed for field trash of pottery and porcelain slaggy. Accordingly, be about to get high pure clean PREP is pulverous, can reduce field trash content through perfecting smelt technology [1, 2] . However current smelt technical condition, wanting production to go out not to contain the good material of field trash is impossible [3] . So, still need to pass pair of powder to undertake reconditioning with the field trash in purify powder. At present metalloid field trash basically uses electrostatic separation process in powder of alloy of purify high temperature (ESS) [4] . About with alloyed powder of high temperature of ESS law purify the experimental data of field trash of metal of end Central Africa reports very little [4, 5] . The article is passed with what differ corona pole voltage and roller canister rotate speed are opposite field trash of the pottery and porcelain in powder of alloy of ESS purify high temperature A ｌ the effect of 3 undertook 2 O consider and made abecedarian theory analyse. 2 experiments method 2.

1 experiment principle is electrostatic and detached it is to use corona discharge phenomenon and metallic powder and metalloid field trash electric quality is different undertake depart. The maximum pressure that uses extensively at present is electrostatic and detached the principle sees a picture 1. Electrostatic and separate unit basically is comprised by two electrode, fine tinsel is one extremely, the canister of roller of big diameter metal that ground connection has certain rotate speed serves as another extremely. When polar when the voltage between reachs some numerical value, fine tinsel produces corona discharge phenomenon (this extremely call corona pole) , be in thereby polar a generation corona electric field. This electric field is very inhomogenous, the electric field strength near corona pole is very great, the air near its produces collision ionization, arose electron and ionic, certain electron adheres to again anion is formed on neuter element. Electron, ion and anion move to as contrary as respective polarity electrode respectively, form corona electric current then. Corona can be negative pole extremely, also can be positive electrode. When corona very when negative pole, when the electric pressure ratio that air is needed by puncture place is positive electrode get high much. Electrostatic depart is to use corona discharge appearance, because this must prevent air produce scintilla by puncture to discharge, because scintilla discharge destroys the on the rails of separate course. Be like corona very negative pole, after metallic powder falls to roller canister surface to enter the high-pressured corona electric field that corona pole place produces via feeder, metallic powder and metalloid field trash and the electron that fly to canister of positive electrode roller and anion encounter, these electrons and anion adhere to go up in metallic powder and metalloid field trash, make its take negative electric charge. Because the metal is pulverous conductivity is tall, acquisition negative electric charge is passed by the metallic roller canister of ground connection instantly (make an appointment with 1/40 ～ 1/1000 ｓ ) [6] , fall from roller canister ahead below centrifugal force and gravitational joint action, enter conductivity of field trash of metal of and rather than of; of canister of finished product pink low, lose charge not easily, fall to be by adsorption on roller canister in the action of the coulomb force of corona electric field and lens face appeal, as the roll of roller canister be taken ever since lower part, be brushed by steel below. 2.

The Germany that 2 experiments method and parameter experiment are importing high-pressured corona undertakes Hailasi on electrostatic segregator. Its are main parameter is, metallic roller canister 250 ｍ of 320 × ｍ , corona pole voltage is highest for 40 ｋ V, corona very the stainless steel silk of 1 ｍ ｍ , the included angle with vertical sectional axis is corona pole and roller canister 15 ° , with roller canister surface the distance is 80 ｍ ｍ . Is experimental parameter: ? V of ｋ of?0 of straight snipe of dog of Miao of  of entangled short for Weihe River, 40 ｋ V, roller canister rotate speed is 25 ｒ respectively / ｍ ｉ ｎ , 50 ｒ / ｍ ｉ ｎ , 80 ｒ / ｍ ｉ ｎ , clapboard and clearance of roller canister surface 5 ｍ ｍ . The experiment is 50 ～ with size range the alloyed powder of PREP high temperature of 100 μ ｍ end, in every 100 ｇ with artificial method the mix into in pure powder enters size range to be 50 ～ the pure A ｌ with the gules move of 100 μ ｍ 3 grain of 2 O 10. After ESS is handled, detect with stereomicroscope 2 O of ｌ of the A in powder 3 grain are surplus a number, computation gives purify to lead. 3 tests result and theoretical analysis can see, experimental parameter is different, electrostatic cent is different also from purify effect. When roller canister rotate speed is certain, as corona extremely of voltage elevatory, 3 grain purify leads 2 O of A ｌ elevatory; is become when corona pole tension is constant, reduce roller canister rotate speed, purify rate is elevatory. From purify effect and consideration of actual production angle, does this laboratory use high-pressured corona is the optimal craft parameter of 3 grain 2 O of ｌ of A of electrostatic segregator purify: ? V of ｋ of?0 of Miao of  of entangled short for Weihe River, roller canister rotate speed 50 ｒ / ｍ ｉ ｎ . Document [4, 6, 7] thinks, metalloid in electrostatic and separate course field trash is relatively dormant get on roller canister the action of 5 kinds of force, the author thinks to still should consider field trash and metallic roller canister the attrition power that metalloid field trash gets force face in roller canister surface. Assume metalloid field trash is globose grain, 6 kinds of force can convey for: The 2= of force 　 ｆ that electric field of even corona of blame of 1= of ｆ of human relations force causes the library of corona electric field 1 photograph compares its size and ｆ dinky, negligible not plan. The lens face appeal of electrified metalloid field trash and roller canister surface 　 ｆ 3= in addition, still have; of ｇ of ｍ of gravitational ｆ 4= 5=5 of ｆ of inertial and centrifugal force.

2 D of ｎ of ｍ of 5 × 10e-3 μ of 6= of ｆ of; attrition force (1+ ｆ of ｆ 3- ｆ 5) . In E of roller canister surface the dot lies on upend direction the resultant force that metalloid field trash gets is ｆ of 4=(of ｆ of 6- of ｆ = ｆ μ of 5) of ｆ of 1+ ｆ 3- - ｆ 4. ｆ 1, ｆ 3, ｆ 4 with ｆ 5 belts reach into ｆ the E in type of 　 ｆ = -- , the intensity of corona electric field of position of location of metalloid field trash, v / ε of ｃ ｍ ; -- , the ρ of dielectric constant; of metalloid field trash -- , the density of metalloid field trash, ｇ / ｒ of ｃ ｍ 3; -- , the radius of metalloid field trash, μ of ｃ ｍ ; -- , the ｆ of M of; of the biggest coefficient of friction between metalloid field trash and metallic roller canister (R) -- , the function of resistor of interface of metalloid field trash, adjacent at 1; D -- , roller canister diameter, ｎ of ｃ ｍ ; -- , roller canister rotate speed, ｒ / ｇ of; of ｍ ｉ ｎ -- , gravitational acceleration, its size is 980 ｃ ｍ / ｓ 2. Because be in,field trash of metal of Central Africa of electrostatic and separate course is flowed the collision of metallic powder and concussion action, the metalloid field trash with small ｆ getting power may be before E dot from roller canister apparently fall off, fall to roller canister ahead along with metallic powder, use electrostatic separation process so the metalloid field trash in powder of metal of cannot complete purify, in ｌ of the A below this experiment condition 3 grain purify leads 2 O highest for 76.

7% . Can say ｆ value is greater, metalloid field trash breaks away from surface of metallic roller canister more not easily, purify effect is better. Corona pole voltage is taller, e of intensity of corona electric field is taller also, the coulomb force ｆ of corona electric field 1 bigger also, ｆ value is greater also, namely ｎ of rotate speed of canister of roller of better also; exceeds the purify result of metalloid field trash low, the ｆ of inertial and centrifugal force of metalloid field trash 5 smaller, ｆ value is greater also, namely the purify effect of metalloid field trash is better also. But in be being produced actually, ｎ of roller canister rotate speed cannot infinite low. Its reason, it is manufacturing efficiency low; field trash of 2 dispute metal and time of roller canister contact are too long, metalloid field trash loses the share likely charge, cannot be in by adsorption roller canister apparently and pour out of together along with metallic powder, cannot finish thereby from inside metallic powder depart gives metalloid field trash this one process. 4 conclusion (1) craft parameter is different, electrostatic cent is different also from purify effect. When roller canister rotate speed is certain, as corona extremely of voltage elevatory, 3 grain purify leads 2 O of A ｌ elevatory; is become when corona pole tension is constant, reduce roller canister rotate speed, purify rate is elevatory. But, when roller canister rotate speed is too low, time of field trash discharge is lengthened, purify rate reduces; instead next, when roller canister when rotate speed is very low, manufacturing loss of efficiency. (2) falls in this experimental condition, is electrostatic cent 50 ～ from purify size range the A ｌ in the powder of high temperature alloy of 100 μ ｍ is the optimal craft parameter of field trash of 3 pottery and porcelain 2 O: ? V of ｋ of?0 of Miao of  of entangled short for Weihe River, roller canister rotate speed 50 ｒ / ｍ ｉ ｎ . (The regularity of the experimental result that 3) studies originally and theory analyse photograph be identical. CNC Milling