Ultrafine pulverization technology is a new technology that has been developed rapidly in order to meet the high requirements of modern industrial, electronic, biological processing and other processes on the size of raw materials. Ultra-fine pulverization technology can superfine ordinary substances, and improve the surface and interface properties of the substance without changing its chemical composition, so that the use effect is better than ordinary powder. At present, superfine pulverization technology has been widely used in many fields including the pharmaceutical industry.

    Astragalus, as a basic traditional Chinese medicine, has the functions of invigorating Qi and solidifying surface, promoting hydration, reducing swelling, supporting toxins and purging, and promoting muscle growth. It is often used to improve the immunity of the lung and respiratory system, and can also be used to enhance the function of the spleen. However, because the traditional methods of taking the effective ingredients of Astragalus cannot fully utilize, the researchers proposed various ways of taking such as impact, tablets, oral liquid, etc. to improve the utilization of the effective ingredients in Astragalus, so how to use ultra-fine grinding Technology is of great significance to the refinement of Astragalus. Jinan Tianfang Machinery Co., Ltd., as a professional manufacturer of superfine pulverizers, today will introduce the law of the change of the particle size of astragalus membranaceus with the feeding speed of jet pulverization.

1. The initial particle size is 43 μ m

    The initial particle size of 43 μm and the variation of the particle size of the jet milling particles with the feeding speed are shown in Figure 1. It can be seen from Figure 1 and Figure 2 that with the increase of the feeding speed, the fineness of Astragalus is getting higher and higher. After the feeding speed is 172Hz, the particle size tends to be stable, D 50 and D 90 are both small, and the particle diameter becomes small when the feeding speed is 174 Hz. When the feeding speed exceeds 176Hz, the diameter of the astragalus particles increases. This is because the astragalus particles enter the jet mill cavity at one time due to the excessive air velocity in the jet mill cavity, and the jet pulverizer nozzle's jet ability is reduced. weaken.

2. The initial particle size is 150 μm

    When the initial particle size is 150 μm, the output of jet milling is greatly reduced, resulting in material accumulation. Astragalus powder is accumulated in the jet milling cavity and cannot be discharged in time, making jet milling stop. It can be seen that the jet mill has higher requirements for the feed particle size of the powder. When the jet mill is used for pulverization, the pulverization time should be prolonged and the feed size should be reduced when the powder is coarse.