Method and device for preparing nano-powder by thermal cracking

Abstract

The invention provides a method and a device for preparing nano-powder by thermal cracking, and belongs to the technical field of nano-powder preparation. According to the preparation method, an airflow mixture formed by powder and superheated steam is sprayed into a thermal cracking reactor by supersonic thrust, and continuous thermal cracking crushing is carried out on the powder through high-temperature and high-pressure superheated steam airflow. The preparation device comprises a superheated steam generator, a Laval jet device and a thermal cracking reactor, the superheated steam generator is used for generating superheated steam. The Laval jet device communicates with the superheated steam generator and is used for mixing and colliding superheated steam and powder to form a crushed airflow mixture. The thermal cracking reactor communicates with the Laval jet device, so that the airflow mixture ejected by the Laval jet device is subjected to a continuous thermal cracking crushing reaction. The method for preparing the nano-powder by thermal cracking has the advantages of high energy utilization rate and high crushing strength, and the preparation device has the advantages of low investment, low cost, high yield and good quality.

Description

technical field [0001] The invention belongs to the technical field of nanometer powder preparation, and in particular relates to a method for preparing nanometer powder by thermal cracking. In addition, the invention also relates to a device for preparing nanometer powder by thermal cracking. Background technique [0002] With the continuous development of modern industry and the wide application of new technologies and new materials, ultra-fine powders and micro-nano-scale powders continue to achieve innovation in plastics, papermaking, coatings, rubber, building materials, medicine, new energy and other related industries. Applications, powders of various specifications play a very important role in various application fields. [0003] Traditional powder processing equipment includes: Raymond machine, ball mill, vertical mill, vibration mill, ultrafine mill, water mill, jet mill, steam mill and other traditional grinding methods. At present, the powder particles processe...

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Problems solved by technology

[0005] The water mill is an equipment that uses water as the medium to adjust the powder into a slurry for grinding. This equipment can produce nano-sized particles, but it adopts the multiple energy conversion method of "dry powder-slurry-dry powder", which makes the grinding process equipment Large investment, high energy consumption, low output, longer and more complicated process route

[0006] Jet mill is a device for grinding with compressed air as the medium. It needs to be combined with sorting and grading equipment during use. The result of jet milling can achieve finer product particle size; however, the energy utilization rate of the system is low, and the configuration required for air power The power of compressed air is large, the pressure increase is not high enough, the air at normal temperature and pressure or heated air has low enthalpy, small specific heat capacity, high energy consumption for preparing compressed air, large equipment investment, high failure rate, low production efficiency, low output, high production cost

[0007] The steam mill is a device for grinding with steam as the medium. The steam mill has the defects of slow steam production, low temperature, high energy consumption and large investment.

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