1, formation process
Machine-made sand is mainly sand processed by auxiliary equipment such as sand making machine; Washed sand is the raw sand for casting after natural silica sand is washed and graded. Natural sand is formed by natural conditions (mainly rock weathering).
2. Particle shape
Machine-made sand products are relatively regular, and can be processed into sand with different rules and sizes according to different technological requirements, which can better meet daily needs; Scouring sand is mainly floodplain sedimentary sand with grayish white-grayish yellow color, which consists of medium fine sand, medium coarse sand, coarse sand, gravel layer and gravel layer. Its occurrence takes the river bed as the strike, and the surface layer inclines from the river bank to the river bed, and inclines from upstream to downstream; Rock particles with natural sand particle size below 5 mm.
Step 3 clean
Machine-made sand is clean and free of dirt, and both washed sand and natural sand have a certain silt content, which is not clean enough.
Extended data:
Compared with natural sand, artificial sand has the following differences and advantages:
The artificial sand washing material is excellent and stable. Manual sand washing is a manually selected raw material, which is uniform and stable. The mineral composition and chemical composition are consistent with the raw material, which is not as complicated as natural sand. The sand is clean, free of mud and other harmful impurities, and its performance is stable. Good particle size classification. A kind of artificial sand washing, one fineness modulus, only corresponding to one gradation. Its fineness modulus has a linear relationship with the screen allowance of a single screen. As long as the linear relationship is established and the screen allowance of a single screen is measured, the fineness modulus can be calculated accurately and quickly.
However, the fineness modulus of ordinary natural sand can be graded in many ways. The fineness modulus can be artificially controlled through the production process, and the production can be organized according to the requirements of users, which is impossible for natural sand.
References:
Baidu Encyclopedia-Mechanism Sand?
Baidu encyclopedia-natural sand
Baidu encyclopedia-washing sand