How is Shuangfei powder produced? The more detailed, the better. Thank you.

Shuangfei powder, also known as "old powder", is mainly composed of heavy calcium carbonate, also referred to as "heavy calcium carbonate", and calcite powder (Shuangfei powder) is also called heavy calcium carbonate. It is made of high-quality calcite by mechanical crushing and screening, with calcium carbonate content above 98%, whiteness of 95 degrees and fineness of 325 meshes. Shuangfei powder is non-toxic, and it does no harm to human body except avoiding inhalation into respiratory tract. White or yellowish powder, insoluble in water, soluble in acid. This ore is made by mechanical crushing. There are two kinds of Shuangfei powder: natural and artificial. Shuangfei powder is made of stone as the main component by mechanical crushing, grinding and sieving. The purity and whiteness are very high, and they are generally made of scraps of pure white marble after crushing and grinding. Stable quality and good effect. It has leveling, wear resistance and certain hiding power, and is also one of the important fillers in architectural coatings.