Production method of ultra granule yttria

Abstract

The present invention provides a preparation method of superfine yttrium oxide. The yttrium oxide solution and oxalic acid solution are subjected to homogeneous precipitation in a co-precipitation manner with an error of 4~6% and a reaction time of 10~20 minutes; wherein the yttrium oxide solution has a concentration of 40~100 g / l, a pH value of 2 and a temperature of 15~25 DEG C; the oxalic acid solution has a concentration of 8~10% and a temperature of 15~25 DEG C. Then, polybutanol serving as dispersant is added into the homogeneous precipitation solution, wherein the dosage of polybutano is 0.1~0.3% by volume of the total amount of the precipitation solution, and the obtained precipitation solution is filtered for 10~20 minutes to separate the mother liquor and the precipitate, then the precipitate is scrubbed for 3~5 times, filtered, and roasted at 850~900 DEG C for 3~3.5 hours, thereby, the superfine yttrium oxide (D50 less than 1 um)is obtained. The present invention has the advantages of simple manufacturing technique, high product quality, excellent size distribution, uniform particle displayed under ultramicroscope, smooth and shining surface, no hardened layer, excellent physical property; besides, when the superfine yttrium oxide is used for fluorescent powder, the light colour is good, the light wane and the color temperature are excellent.

Description

technical field [0001] The invention belongs to the field of new materials and relates to a production method of ultrafine yttrium oxide. Background technique [0002] The particle size and other physical properties of yttrium oxide directly affect the quality and application of downstream products. Ultrafine yttrium oxide has attracted much attention because of its excellent performance in the fields of light, electricity, and physical and chemical reactions. At present, the production of superfine particle center particle size D 50 = 0.1 ~ 1μm yttrium oxide methods, mainly physical and chemical methods. The physical methods mainly include: 1. Physical crushing method, through mechanical crushing, electric spark explosion, ultrasonic fragmentation, etc. to obtain superfine yttrium oxide, which is characterized by simple operation and low cost, but the product has low purity and uneven particle size distribution. The surface is rough, especially after crushing, the physica...

AI Technical Summary

Problems solved by technology

The physical methods mainly include: 1. Physical crushing method, through mechanical crushing, electric spark explosion, ultrasonic fragmentation, etc. to obtain superfine yttrium oxide, which is characterized by simple operation and low cost, but the product has low purity and uneven particle size distribution. The surface is rough, especially after being crushed, the physical properties of the grains deteriorate and the performance index decreases

2. The mechanical wet ball milling method, under the condition of adding water, ball-mills large particles of yttrium oxide, dehydrates, dries, and roasts. It is characterized by simple operation, but the product has low purity, uneven particle size distribution, and complicated procedures. High equipment requirements and large investment

The chemical methods mainly include: 1. Microemulsion method. Two kinds of immiscible solvents form an emulsion under the action of a surfactant, and form nuclei in microbubbles, coalesce, agglomerate, and heat treat to obtain ultrafine particles. It is characterized by good monodispersity and interfacial properties of particles, and uniform particle size distribution, but its solvent cost is high, the process is complicated, and it is not easy to control

2. Precipitation method, control certain conditions, add precipitant to yttrium solution and react, then filter and burn the precipitate to obtain superfine yttrium oxide, which is characterized by simple operation, low production cost, low equipment requirements, and low investment Small, but the particle size is large and difficult to control, and the particle size distribution is not ideal