One-step granulation system for ultrafine powder

Abstract

The invention relates to the technical field of one-step granulation, and discloses a one-step granulation system for ultrafine powder, including a spray fluidization chamber, and an air distribution plate is arranged below the screen at the bottom of the spray fluidization chamber, and the spray The upper part of the fluidization chamber is provided with an air induction chamber, and the top of the spray fluidization chamber is provided with a through hole communicating with the air induction chamber. The through hole is connected with a titanium rod filter, and the center of the through hole is provided with a nozzle. One end is connected to the compressed air blowback device; the air distribution channel formed by the air flow distribution plate and the air flow distribution plate surface of the fluidized bed present a channel angle of 30-60°, thereby changing the direction of the air intake, increasing the wind speed, and simultaneously entering the air The whole is rotating, which is conducive to improving the uniform state of fluidization; the pore size of the titanium rod filter is 0.1-10 µm, which can effectively block ultra-fine dust and reduce leakage of materials; The dust accumulated on the titanium rod filter is dusted off to improve the granulation efficiency of the powder.

Description

Technical field [0001] The present invention relates to the technical field of one-step granulation, and more specifically, to a one-step granulation system of ultrafine powder. Background technique [0002] Fluidized bed granulation, also known as boiling granulation, refers to the use of airflow to suspend the powder material in a boiling state, and then spray the atomized binder to make the powder granulate, and finally obtain the dry granule. In this process, the material is mixed , Granulation and drying are completed at the same time, so it is also called one-step granulation. [0003] The one-step granulation system is generally composed of dust collection system, spray fluidization chamber, raw material container, control system and other parts. The working process is that the purified air enters the raw material container through the bottom after being heated. The hot air heats the material and makes it fluidized. At this time, the binder is sprayed in in the form of a mi...

AI Technical Summary

Problems solved by technology

[0006] With the rise of modern ultrafine pulverization technology, the overall particle size of raw and auxiliary materials after ultrafine pulverization is mostly less than 45µm, of which the particle size is 0.1µm-10µm accounting for more than 20%, and 10µm-30µm accounts for 60%. As mentioned above, for this kind of raw material powder after ultrafine treatment, because its particle size is too small, it is easy to produce electrostatic adsorption, so the air distribution plate with conventional planar hollow structure is used for one-step granulation of ultrafine powder In the process of powder fluidization, there will still be powder sticking and powder accumulation on one side of the cavity, and the air flow distribution plate in the prior art cannot achieve uniform fluidization of the material.

In addition, if a conventional dust collection device is used to granulate ultrafine powder, the powder is easily entrained by the airflow, and the solid powder carried by the exhaust gas will be discharged through the aperture of the dust-proof bag, resulting in large material loss. The granulation efficiency is low, which affects the performance and practical application of the final product of ultrafine powder. Therefore, it is necessary to improve the existing one-step granulation system so that it can achieve efficient granulation of ultrafine powder

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