Device and method for producing high-purity ultrafine spherical silica powder through countercurrent electric heating

Abstract

The invention discloses a device and method for producing high-purity ultrafine spherical silica powder through countercurrent electric heating. The device comprises a micro-powder material bin, an electric heating furnace, a spheroidization furnace, a finished product bin and a screening system; the bottom of the spheroidization furnace is connected with the electric heating furnace; the lower end of the electric heating furnace is connected with a compressed air channel, and the side part of the compressed air channel is connected with the micro-powder material bin; the bottom of the spheroidization furnace further communicates with the finished product bin through a cooling pipe; and the upper part of the spheroidization furnace is connected with the screening system. The invention further discloses the method for producing spherical quartz and spherical quartz powder through the device. The device and method have the beneficial effects that spheroidization and grading of the silicapowder are achieved through combination of the spheroidization furnace and a grading system, and by controlling the air volume of an induced draft fan, the air flow of compressed air and the feedingamount, the particle size of spherical particles of a cyclone separator is adjusted in real time.

Description

technical field [0001] The invention belongs to the technical field of deep processing of non-metallic ores, and in particular relates to a production device and method of spherical micro-silicon powder. Background technique [0002] In recent years, with the rapid development of microelectronics technology, people have higher and higher quality requirements for microelectronic components, which makes the quality requirements of silicon micropowder higher and higher. 97% of global integrated circuit (IC) packaging materials use epoxy molding compound (EMC), and in the composition of EMC, in addition to the main material novolac epoxy resin, silicon micropowder is the most used filler. The microsilica filler accounts for 70%-90% by weight of the epoxy molding compound. Therefore, for high-quality plastic packaging materials, in addition to ultrafine, high-purity, and low-radioactive elements, microsilica powder is also required to be spheroidized. This is because: (1) the s...

AI Technical Summary

Problems solved by technology

[0007]The disadvantage of this method is: industrial gas -- acetylene gas and natural gas will also bring certain pollution to product quality during the combustion process

[0012] The disadvantage is that the method is only in the laboratory stage and cannot be mass-produced well

[0014] Disadvantages of this method: At present, this method is only in the laboratory stage and cannot be mass-produced well

[0017]Disadvantage of this method: The technology is currently experimental

The disadvantages are: the raw materials are more expensive, the sintering of the particles is poor, the shrinkage is large during drying, and the problem of agglomeration is easy to occur

Disadvantages of this method: At present, this method is only in the laboratory stage, and it cannot be mass-produced well.

Disadvantages of this method: high energy consumption, severe agglomeration of the dried powder, and inconvenient use

[0028] searched Chinese patent literature, and found no direct use of high-purity ultra-fine silicon powder directly atomized into a high-temperature spheroidizing furnace heated by electric heating at 2000-2300 ° C to prepare high-purity ultra-fine spherical silicon powder Reports on the industrial application and use of industrial equipment

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