Jet mill working principle and application

Is the use of the material in a jet mill under the action of high-speed airflow , made ​​great momentum , the material in the grinding chamber is formed between the particles in

high-speed collision , violent friction , and high-speed airflow shearing action on the material , so as to achieve the purpose of crushing , it will be processed into raw

materials

A fine powder (<10μm). The almost universal use of techniques all fine processing industries , such as chemical, pharmaceutical, food, plastics, mining, metals information,

etc. , in many specific areas occupy a special position of the powder .

Currently on the use of jet mill industrial importance are the following types: flat jet mill , jet fluidized bed jet mill , jet mill circulating tube for jet jet mill , target

type jet mill . Which flat jet mill , jet fluidized bed jet mill , jet mill circulating pipe transport

With the more common , now it works to make a simple elaborated

1, the flat jet mill

As the grinding pressure of kinetic energy into the crushing chamber airflow outside airflow deployment package as a gas regulator station , the airflow through the Laval nozzle

into a supersonic jet deceleration after smashing into the grinding chamber , while the material imported scriptures Venturi nozzle reducer mill grinding chamber synchronize

crushed. Because Lava

Seoul nozzle and the grinding chamber installed at an acute angle , so that the high-speed flow in the grinding chamber with radioactive material to make recycling plant

stationary , fixed between the particles and the particles and the target plate wall of mutual shock, impact , friction and grinding . Fine particles in the air flow to the

heart center , driven by import grinder

Outlet pipe into the cyclone to collect , meal thrown in the action of centripetal force to crush looping stationary peripheral wall cavity and inherit crushed.

2 , jet fluidized bed jet mill

Material through the screw apron feeder into the crushing cavity, the absolute number of spray nozzles is set to export high-speed airflow impact energy, and the rapid expansion of

air flow was generated by boiling fluidized suspension collision , friction of the material for grinding . Thickness of the mixed powder in the negative pressure driven flow

through the top design

Turbine installation position classification , powder forced through graded installation by cyclone collector and baghouse collector , meal by gravity and high-speed rotation of

the centripetal force generated graded installation Shuaixiang return grinding chamber walls and settling inheritance crushed. i4A China feeder breaker Industry Information Network -

based

Feed, livestock serve

3, circular tube jet mill

Raw materials by the venturi nozzle participate grinding chamber , by a group of low- flow spray nozzle into different diameters varying curvature racetrack-shaped loop tube

grinding chamber , so that each particle deceleration shock, impact , friction and grinding . Meanwhile cyclone also brought along the pipe was crushed particles up into the

grading area, in the sub-

Field -level district under the action of centripetal dense material flow diversion, fine particles in the inner inertia classifier by louvered discharged after grading . Coarse

particles in the outer loop along the downstream pipe return inherited crushed .

However, currently the most widely used within the industry jet fluidized bed jet mill , since the crush model designed nozzles in parallel along the inner wall of the grinding

chamber , arranged symmetrically formed only in the range of three-dimensional on the radio , so the material can only be crushed within the approximate size of a pulverized

solid , which

Will lead to the following shortcomings:

( 1 ) Once the material falling into the grinding chamber at the bottom of coarse material collecting vessel , enters the crushing blind , unable to inherit crushed ;

( 2 ) limited by the nozzle at the bottom of the grinding chamber coarse material in a fluidized state collector blind , material non- fluidized state , you can not inherit

crushed ;

( 3 ) crushing chamber crushing zone restrictions incurred by small size , making the jet mill reduced probability .

Above the needle on the many problems , many research institutes, production companies make a lot of improvements , but also for a large number of patents. Wherein the three-

dimensional arrangement of the nozzle effects the most ideal method , which expand the crushing area , increases the friction material probability of collisions between

particles . Be

Joint flat with fluidized bed made ​​of a new equipment , according to the performance test data , to the extent of similar products in the same product and the size of the

premise, yield was significantly higher than similar products.