Technical Discussion about Dry Powder Mixing (II)
Time 2024-04-03 Browsing times 次
Ideal methods to mix dry powder quickly and evenly
1, try to make the three major indexes involved in the various powder mixed (liquidity that particle
diameter, bulk density, relative close)
When the three major indexes are close, mixed work will be of high quality and high speed; when
they index the greater the difference between the hybrid will be more difficult; the latter situation can
be solved by two methods:
Through the pretreatment method of indicators will adjust their to the relatively close, and then mixed;
If unable to carry on the pretreatment, you can also use double motion mixer with forced mixing function
to direct solution!
2, in the mixing process, the ideal model of powder movement
We have a slogan: to do large mixed homogeneous, small fine fully!
First, the design of a moving vessel, it can make the powder flow do scroll up and down, left and right
convection hedge movement and folding motion, let the powder around the upper and lower overall is
uniform, and no material dead. This is not enough, but also to design a pair of powder internal subtle
shear, stirring device, fully displacement, swap in micro make between the particles and the particle
powder, achieve the fine detail of the uniform, ideal mixing motion model and this is what we want to
achieve.
The macro to achieve overall consistent uniform, but also in the micro level to fully refined uniform! This
is also the mixing process of the guiding principle of the work.
So we have to do is mixed process and selection of mixing equipment should be carried out at the guid-
ing principle in the next.
3, the classical mixing process as much as possible to maintain the original appearance of the powder
In order to ensure the post production process of product quality, the powder before and after mixing to
try to ensure that its bulk density and particle diameter of the same or less variable (this requirement
is particularly important in the field of powder metallurgy in). This requirement cannot exercise mixing
equipment device too fast or too intense, thus undermining the powder of the original, try to avoid
following the way of the movement:
In order to deal with the liquidity is not good or to destroy the false particles, will add the ball movement
in the container, the original morphology but ball rolling impact would seriously undermine the powder;
Using high speed rotating blade (blade tip line speeds above 200 m / min) to hit the powder, will damage
the original powder;
In the mixing process happens too violently thrown, shock motion, will damage the original powder;
And because the mixing equipment selection error, in the mixed to aim to achieve uniform, excessive
prolong mixing time, will wear and damage powder.
Therefore, the powder mixing process environment should be the ideal:
The mixing equipment movement device moderate speed, continuous, steady motion;
The powder movement speed moderate, changeable direction, powder group was shunt, refinement,
combined, split and refinement, repeated; shunt refinement more small is better.
The mixed evenly as inspection target, mixed time as short as possible.
