Study on the Spray Granulation Process of Tin Oxide and Tantalum Oxide Mixed Spherical Powder
The quality of tin-tantalum oxide(TTO)raw powder is a key factor in determining the quality of its target material.For the TTO raw material powder,a nano slurry with concentrated particle size distribution and stable dispersion was prepared by adjusting the pH value,dispersant dosage,and ball milling dispersion process.By controlling the slurry solid content,inlet air temperature,and atomizer speed,TTO granulation powder with excellent sphericity,uniform particle size distribution,and good fluidity was obtained.Finally,characterization was performed using techniques such as TEM,SEM,UV-Vis spectrophotometry,laser particle size distribution analysis,and vibrating density measurement.The results show that the nano slurry system achieves the best stability and dispersion when the pH is 7,the PVP dispersant dosage is 10%,the ball milling speed is 2 400 r/min and the milling time is 15 minutes.The TTO granulation powder exhibits a narrow particle size distribution(approximately 10 to 12 μm),high sphericity,a smooth surface without agglomeration,and excellent flowability when the solid content is 40%,the air inlet temperature is 220℃,and the atomizer speed is 1 800 r/min.
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