It is important to note that the process of refining metallurgical silicon to polycrystalline silicon is complex and requires specialized equipment and expertise. It is recommended that you work with experienced professionals in the field to ensure the best possible outcome.

To overcome the higher segregation index element in metallurgical silicon and refine it into polycrystalline silicon, you will need to use a process called zone refining or fractional crystallization. This involves melting the silicon and then slowly solidifying it, allowing impurities such as phosphorus and boron to move towards one end of the ingot.

The impurities can then be removed from that end, leaving a more purified silicon material behind.

In addition to zone refining, you may also need to use other purification techniques such as chemical purification or distillation to further remove impurities from the silicon.