How to remove soil from seeds? magnecit separator

how to remove the Soil block in the seeds ?

when cleaning sesame , beans , and other grains , sustomers will face a problem . 

in the seeds , there is soil blocks from the field . it is same size with the seeds . and is is same weight with the seeds . It has become impossible to remove it through different size and weight.

However, it has a characteristic we can use. magnetic.

The iron content in the earth is 5.8%. And the soil is almost the same. This makes the soil easily attractive by magnets. As long as the magnet is strong enough, you can divide it out.

As shown in the figure,in a magnetic separator , we use belt transportation to make the seeds and soil for parabolic falling.

In the case of a strong magnetic field, the trajectory of the soil will be separated from the seeds. It is like buhler magnetic separator working

In this way, we remove the soil of the seeds.