Is it easy to learn to pull monocrystalline silicon?

Single crystal silicon is not easy to learn. According to relevant data, in the process of purification, a key technology of "trichlorosilane reduction method (Siemens method)" has not been mastered in China. Without this technology, more than 70% of polysilicon in China's refining process is discharged through chlorine, which leads to high refining cost and serious environmental pollution.