Device and method for synthesizing spherical quartz powder

Abstract

The invention relates to the field of preparation of spherical quartz powder, and in particular, relates to a device and method for synthesizing spherical quartz powder, wherein the device for synthesizing the spherical quartz powder comprises a smelting furnace, a spraying chamber and an atomizing chamber; an outlet of the smelting furnace is communicated with the spraying chamber, the bottom of the spraying chamber is communicated with the atomizing chamber through a spraying hole, and the diameter of the spraying hole is 0.1 mm-10 mm; and an upper air supply outlet and a lower air supply outlet are formed in the side wall of the atomizing chamber, and the air supply temperature and the air supply speed of the upper air supply outlet are higher than those of the lower air supply outlet. According to the quartz powder prepared by the device and the method, the surface is smooth, the spheroidization rate and the non-crystallization rate can reach 100%, the particle size is easy to control, the preparation process is simple, secondary pollution is reduced, and large-scale production is easy to realize.

Description

technical field [0001] The invention relates to the field of preparation of spherical quartz powder, in particular to a device and method for synthesizing spherical quartz powder. Background technique [0002] Spherical quartz powder refers to the amorphous powder whose particles are spherical and the main component is silicon dioxide. As an important basic material, spherical quartz powder has been widely used in high-tech fields such as large-scale integrated circuits, aerospace, and chemical engineering. In my country, spherical quartz powder mainly relies on imports, and the preparation technology of spherical quartz powder is relatively backward. Therefore, it is very urgent to study the preparation technology of high-quality spherical quartz powder and solve the bottleneck problem that restricts the development of high-tech in my country. [0003] At present, the preparation technologies of spherical quartz powder mainly include flame sphere forming method, plasma met...

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Problems solved by technology

Among them, the flame balling method uses hydrogen, acetylene, etc. as fuel, and forms a high-temperature flame by burning to heat and melt the high-purity quartz powder. The flame temperature is above 2000°C. Transform into spherical droplets, and finally obtain spherical quartz powder by cooling into balls. The main disadvantage of this method is that the flame stability is extremely difficult to control, resulting in extremely unstable temperature field. At the same time, silicon dioxide is easy to react with combustion products, resulting in product Secondary pollution; the plasma method is similar to the flame balling method, except that the heating source of the plasma method comes from a plasma torch, and the temperature is much higher than that of hydrogen and acetylene flames, reaching more than 5000 ° C. Such a high temperature can Quickly melt quartz powder, and under the action of surface tension, it is cooled to form a spherical powder. The temperature of this method is stable and controllable, so the ball forming rate is high and the pollution is small, but the cost is extremely high and it is difficult to scale up; gas phase method, hydrothermal method Synthetic method and sol-gel method belong to chemical methods. The gas phase method uses silicon tetrachloride as raw material and hydrolyzes silicon dioxide particles in a high-temperature flame. The particle size of the prepared particles is too small to be dispersed in organic matter; hydrothermal The synthesis method is to combine organic and inorganic compounds with water below 400°C, ions and molecules form particles through crystallization, and obtain the required quartz powder after washing, filtering, drying and other processes. This method is limited by the size of the reactor. Difficult to scale production

The sol-gel method is to solidify metal-organic or inorganic substances through solutions, sols, and gels, and then sinter to form particles. This method can produce good uniformity, high purity, and small particles, but the process is complicated and the price of raw materials is high. , the particles are easy to agglomerate

[0004] In summary, the existing spherical quartz powder preparation technology has the disadvantages of low particle spherification and amorphization rate, complicated process, high price, and difficulty in large-scale production.

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