Is it harmful to grind soybean milk with granite stone?

No, soybean milk made by traditional stone mill is more nutritious. Using stone mill to make soybean milk can make soybean fully contact with air, and the taste is naturally good. The stone mill contains natural minerals, and is rich in natural jute which is beneficial elements selenium and germanium to human body. It is non-radioactive, tough and wear-resistant, finely crafted, green supervised and scientifically polished, which is of great benefit to health.