Sand has a wide range of applications. It is one of the main materials used in the production of concrete and an indispensable component of building materials. Sand is generally categorized into natural sand, artificial sand, and mixed sand. Natural sand primarily consists of rock particles with a particle size less than 4.75mm, formed by natural weathering, water transport, sorting, and accumulation, but does not include soft rock and weathered rock particles. Artificial sand is processed through a crusher, followed by washing and screening in a sand and stone separator. The resulting rock particles with a particle size less than 4.75mm do not include soft rock and weathered rock particles. Based on the fineness modulus (coarseness index and natural sand particle size grading), sand specifications are classified into coarse, medium, and fine.

As the fineness modulus increases, the sand becomes coarser. The fineness modulus of common concrete sand ranges from 3.7 to 1.6, suitable for medium sand or a mix of 4 parts coarse sand to 1 part fine sand. Sand particle gradation refers to the proportion of sand particle sizes. If the thickness of the sand is the same, the voids are larger. When two types of sand are mixed, the porosity decreases. Mixing three types of sand results in smaller voids. It can be seen that the porosity of sandy soil depends on the degree of matching between the particle sizes.

The sand and stone separator should be cleaned and maintained promptly after use. This article details the key points for cleaning and maintaining the sand separator.

After adding cleaning water to the mixer, it should be drained slowly; do not drain too quickly. If there is some concrete inside, when it is necessary to clean and separate sand and stones, more water should be added, and it should not be drained all at once into the hopper to prevent excessive discharge. Overloading the sand and stone separator can block the discharge pipe and cause damage. The mixer can be refilled with water multiple times, and the diluted material can be drained into the hopper slowly.

In addition, ensure the cleaning and anti-blocking measures for the separator of the sand and stone separator, and also pay attention to the following points:

The drainage channel is the passage for the separator slurry water to enter the sedimentation tank. It must be cleaned thoroughly, free of sediment sludge, to prevent blockages.

2. The sedimentation pond is a storage pond for sludge discharged from the sand separator, used for storing silt. Sufficient sedimentation space should be maintained and it should be cleaned regularly.

3. The water depth in the clear water pool (i.e., the third sedimentation pool) should be greater than 1.5 meters; it should be cleared promptly if it's insufficient. Additionally, maintain the cleanliness of the swimming pool by preventing weeds, fibers, and plastic bags from entering to avoid blocking the water pump.