Preparation method and equipment of zirconia metering nozzle
A technology of sizing nozzle and zirconia, which is applied in the field of functional refractory materials, can solve the problems of poor particle shape and fluidity of blanks, difficult pressing and forming, and high porosity.
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Embodiment 1
[0037] combine figure 1 and 2 , the suspended state circulating granulation equipment of this embodiment includes a pressure pump 1, a feed port 2, a nozzle 3, a cyclone 4, a collector 5, a fan 6 and a mixing cylinder 7, wherein:
[0038] The cyclone 4 includes a core tube 401, an inlet 402, a cylinder 403 and a discharge port 404, the inlet 402 is located on the side of the cylinder 403, the core tube 401 communicates with the end of the cylinder 403, and the discharge port 404 is located on the side of the cylinder 403. the bottom of the body 403;
[0039] The pressure pump 1 communicates with the nozzle 3 to provide power for the material to be atomized to pass through the nozzle 3; the mixing cylinder 7 communicates with the inlet 402 of the cyclone 4, the nozzle 3 goes deep from the upper end of the mixing cylinder 7, and the feeding port 2 is set at the mixing At the bottom of the barrel 7, the screw feeder transports the raw materials from the feed port 2 to the mixin...
Embodiment 2
[0042] Step 1, preparation of mixture: raw materials include partially stabilized zirconia and monoclinic zirconia, and the chemical composition of partially stabilized zirconia is (wt%): ZrO 2 =95.02, HfO 2 =2.04, MgO=2.61, CaO=0.03, Al 2 o 3 =0.03, loss on ignition is 0.27, particle size d of partially stabilized zirconia 95 =4.95 μm; the chemical composition of the monoclinic zirconia micropowder is (wt%): ZrO 2 +HfO 2 >98 and SiO 2 50 =1.0~2.0μm, d 95 <3.75μm; the two raw materials are mixed according to the mass ratio of partially stabilized zirconia: monoclinic zirconia powder = 60:40. Put the above materials into a polyurethane ball mill tank, use zirconia ceramic balls, and grind for 24 hours to ensure that the raw materials are fully mixed;
[0043] Step 2, the preparation of magnesia gel binding agent: preparation concentration is the MgCl of 1.6mol / L 2 Mother liquor, adding the mass percentage of total material weight in step 1 to the mother liquor is 1.2% d...
Embodiment 3
[0048] The difference between this embodiment and embodiment 1 is: the feeder in the step 3 is changed to 750r / min, and the feeding rate is 3.3kg / min; the pressure of the spray equipment pressure pump is calibrated to 0.8Mpa; the flow rate is 0.18l / min; At this time, the dust collection efficiency reaches 74.3%, the granulation efficiency reaches 67.2%, and the particle size composition is biased towards the direction of small particles. The bulk density of the prepared ceramic zirconia sizing nozzle is 5.46g / cm 3 , the porosity of the finished product is 1.21%, the cold compressive strength is 1040Mpa, and the service life is 38 hours.
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Abstract
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