Yellow sand is generally referred to as sand, sand, gravel, etc., referring to small stone particles or things shaped like sand.
Sand is generally divided into two types: natural sand and artificial sand. Rock particles with a particle size of less than 5mm formed by natural conditions (mainly rock weathering) are called natural sand. Artificial sand is made by crushing rocks, and due to its high cost, there are many flaky and powdery materials.
According to their different sources of production, natural sand can be divided into river sand, sea sand, and mountain sand. The surface of mountain sand is rough, the particles are angular, the sand content is high, the content of organic impurities is also high, and the quality is poor. Sea sand and river sand have smooth surfaces, but sea sand has a high salt content, which has a certain impact on concrete and mortar. River sand is relatively clean and widely used.
