The high long diameter of the fluidized bed gas flow is used to pay attention to the silicone
Innovative food development, such as nano-selenium and zinc food, functional health food, entertainment and leisure food, life-saving and military food, nano-bio-conserved agent, etc. have an independent, novelty and other innovative food research and development, Ultrafine pulverization and nanotechnology in the air flow.Silicon gray stone products can be divided into high long diameter than silica graystone and abrasive grayish gray stone, high long diameter ultrafine silica graypicular pink has extremely high application value, such as As a plastic filler, the strength and size stability of the article can be improved; the silica graypicular powder for papermaking fillers also requires the fineness of the L-micron; the wollastite needle powder filled in paint, paint The more obvious performance improvement. Therefore, the processing of ultra-fine silicone gray pulp puzzle powder is prepared to become a research hotspot in various silica graystone processing companies in the world.
The crystalline structure of the silica grayite determines that even the fine particles are also fibrous or needle properties. The а crystal type of the silica grain is 5: 1, the β crystal form is 20: 1, up to 30: 1, and its long diameter is much different than the pulverization method. Improve the long diameter ratio of the silica grayite product, the key is to maintain the original crystallization structure of the mineral in the pulverization process. At present, the equipment used for wafer-like puzzle powder ultrafine pulverization is mainly mechanical impact pulverizer, airflow pulverizer (flat, cycle, impact, fluidized bed, spray), stirring, thunder Meng, vibration mill, etc. Practice shows that shear and friction have always had a tendency to make the particles along the crystalline decision facing surface parallel to force action, which determines the fluidized bed airflow pulverizer is the best to prepare a high long diameter than silicone. equipment. 1 Among them, the fluidized bed gas flow pulverizer is the most advanced multi-nozzle technology, fluidized bed technology and turbine grading technology, realizing the diversification of flow field, material layer fluidization, grading horizontalization. The fluidized bed gas flow pulverizer is pulverized with fluid-compressed air as a working medium, and the fluid speed is as high as 300-500 m / s.
The working principle is that the compressed air is emitted into the pulverizing region after the radiometric airflow is accelerated into a supersonic gas flow. In the pulverization zone, the accelerated material is integrated at the intersection of each nozzle. Here, the particles are in pairsHit the crush. The crushing material is delivered to the grading area by a negative pressure rising airflow, and the fine powder reaching the particle size required by the inner classifier, and the coarse powder that does not satisfy the particle size continues to be pulverized. The qualified fine powder is collected by the cyclonic separator with the airflow, and the dust contains the dust-filled dust collector filter into the atmosphere.
2, the process characteristics of fluidized bed airflow pulverization machine
The process characteristics of fluidized bed airflow pulverizer: The high-speed particles do not collide with the inner wall during pulverization, and the object material does not pass the nozzle. Therefore, the wear is extremely light, the product is not polluted. The upper part of the host is equipped with a horizontal grading wheel, which prevents coarse particles from entering the finished product. Due to the use of fluidized bed principle (airflow expansion, cracking, rubbing, friction) and the horizontal turbine grading device, compared with other types of gas flow, energy saving, energy saving 30-40%. The particle size distribution of the product is narrow and has no large particles, the degree of automation is high, the noise is small, and the structure is compact.
3 The speed of the grading wheel has a significant effect on the long diameter of the silica grayite product, and Liu Haixin et al, the effect of different graded rotary speed on the ratio ratio of the silica gray stone product, its research results show that with the continuous race speed Increased, the long diameter of the silica grayite is gradually increased, and after a peak, it will decrease rapidly.
(2) The influence of the gas flow pulverization pressure on the long diameter ratio of the silica gray
When the grading wheel speed is constant, with the increase of the gas flow, the average length of the product is significantly short, but average There is no obvious fluctuation in the diameter, so the overall perspective, with the increase of the gas flow, the silica graystone is reduced.
(3) Influence of the raw material heating time, the temperature on the long diameter ratio of the silica grayite
In order to increase the pulverization efficiency, heat treatment is used to heat treatment, induce the grain boundary, reduce the material strength, improve the wear resistance . The crystal structure of the silica grayite makes it cleaves along the Ca-O bond at the time of calcination, free Ca2 + ions and O2 + ions, filled into the lattice gap, which is required to crush the silica graystone during the gas flow collination. Small energy, so the particles are easily broken, the time required for crushing, such a qualified grade silicone ashStone products leave the pulverized cavity in a timely manner, protect the long diameter ratio of the silica grayite product in time. Therefore, the silica grayite is heated, and then the airflow pulverizer is used to pulverize, it will find that the suitable heating temperature is 600-800 ° C, and as the heating time is extended, the change in the long diameter of the silica graystone product is After an increase, it is reduced, that is, to get a high long diameter of the silica grayite product, there is an optimal heating temperature and heating time.
(4) The grading processing of the raw material is the impact of the silica grayite long diameter ratio.
First grade the silica gray stone, then the fluidized bed gas flow pulverizer is used, which can protect the silicon ash well. The long diameter ratio of the stone product is relatively uniform, and the silica grain product obtained under different grains is relatively uniform. The material is given to the gas flow under grade, which is an effective step of producing a high long diameter than silicone. Take advantageous use of silica gravine solid, obtain a high long diameter of silica ash ultrafine powder, improve its added value, and is the premise of the deep processing and utilization of silica gray. The ability to force the silica gray stone pulverization is different, and the morphology of the pulverized product is different. The force applied to the silica grain particles during the pulverization process is the shear force to obtain an ideal high long diameter than silicone. The gas flow pulverizer pulverized with compressed air can form a high-speed airflow trajectory in a pulverizing chamber, which is mainly due to the shear effect. It is characterized by colliding with each other, rubbing each other, rubbing and protects the silica granite crystal shape. appearance.
If the product has quality problems, the repair, replacement, and retreats "three-package terms". From the date of the equipment warranty, the customer will enjoy the whole machine with the invoice and warranty certificate. "Warranty Service" of the year. In the normal use of equipment, the cost of maintenance produced by the unit itself is subjected to the ALPA, except for the except of the ALPA.
