How is the difference between quartz sand and silica?

Silica can be exported, but the export of quartz sand is prohibited, so I want to know in detail, how does the customs distinguish it? Specific points, image points, such as composition, form, processing technology, etc.

Quartz sand is a kind of quartz particles made by crushing quartz stone. Quartz stone is a kind of non-metallic mineral. It is a hard, wear-resistant and chemically stable silicate mineral. Its main mineral component is SiO2, quartz sand The color is milky white, or colorless and translucent, with a Mohs hardness of 7. Quartz sand is an important industrial mineral raw material, non-chemical dangerous goods, widely used in glass, casting, ceramics and refractory materials, smelting ferrosilicon, metallurgical flux, Metallurgy, construction, chemicals, plastics, rubber, abrasives, filter materials and other industries.

Silica sand, also known as silica or quartz sand. It is based on quartz as the main mineral component, and the particle size is

The refractory particles of 0.020mm-3.350mm are classified into artificial silica sand, water-washed sand, scrubbing sand, and selected (flotation) sand according to different mining and processing methods. Silica sand is a hard, wear-resistant, chemically stable silicate mineral, and its main mineral component is SiO2

, The color of silica sand is milky white or colorless and translucent.

The main components of quartz sand and silica sand are sio2, which are distinguished according to the content of sio2. Those with sio2 content above 98.5% are called quartz sand, and those with sio2 content below 98.5% are called silica sand.

Quartz sand has a high hardness, about 7, and the hardness of silica sand is 0.5 grade lower than that of quartz sand. The color of quartz sand is crystal clear, and the color of silica sand is pure white, but it is not shiny and does not have a crystal clear feeling.