What is casting sand?

In the 17th century AD, China used silica sand as a molding material for making castings such as clocks, mirrors, pots, and artillery. However, the early use was mostly natural silica sand containing clay, namely mountain sand and river sand, which had good plasticity and could be directly used for manufacturing molds and cores, suitable for the conditions of manual production at that time. After the large-scale industrial production of castings, especially after the mechanization of molding, the uniformity of the properties of natural silica sand containing clay was poor, and the quality of the sand was difficult to control, which could not meet the process requirements. Therefore, sand factories were established to wash, scrub, and select natural silica sand to obtain various high-quality silica sand. Cast sand or artificial silica sand made by crushing silica. At the same time, the use of various non siliceous sands has also been expanded. The application and development of resin sand molding and core making technology have put forward higher requirements for the quality of casting sand, such as less fine powder, small specific surface area, and low acid consumption. In addition, there are new requirements for the size, shape, and distribution of sand particles.