In recent years, due to the shortage of natural sand and the development of infrastructure construction, artificial sand is faced with good development opportunities, and artificial sand production requires a lot of sand making machine. Along with the increase of market demand, the sandstone is an important material of building industry, demand is quite big,…

The root causes of minerals generate a magnetic substance is the result of an internal molecular or atomic electrons running. The formation of molecular motion of electrons circulation, thus generating a magnetic field. Electronic sports side stretch is orbiting around the nucleus; the second is the electronic spin of their own movement. Weak magnetic moment…