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Stone powder, an ancillary byproduct of sand-making, is regarded as a recoverable resource.

Release date:

2021-09-15

Stone powder, an ancillary byproduct of sand-making processes, is regarded as a valuable resource. Its fineness typically exceeds 200 mesh, with the particle-size threshold generally set at 75 µm–45 µm–10 µm. Different fineness levels correspond to varying degrees of reactivity and specific surface areas. Depending on the lithological characteristics of the parent rock, it is broadly classified into two main types: igneous and sedimentary.

Stone powder, an ancillary byproduct of sand-making, is regarded as a recoverable resource.

Stone powder, an ancillary byproduct of sand‑making and shaping processes, is regarded as a valuable resource. Its fineness typically exceeds 200 mesh, with the particle-size threshold generally set at 75 µm–45 µm–10 µm; different fineness levels correspond to varying reactivities and specific surface areas. Depending on the lithological characteristics of the parent rock, it is broadly classified into two main types: igneous and sedimentary. Igneous rocks, such as granite, are medium‑hard, have high silica content, and tend to be relatively inert (slightly acidic). Sedimentary rocks, predominantly limestone, exhibit slightly higher reactivity (slightly alkaline). Consequently, these distinct parent materials impart differing properties to the resulting stone powder. It is commonly employed as a concrete filler, admixture for composite mortars, and in the production of bricks, curb stones, precast concrete products, imitation‑stone tiles, asphalt mixtures, mortars, and subgrade mixes. Further grinding can yield applications as a raw‑material additive in cement production, a desulfurization agent in power plants (using limestone), filtration media, coating ingredients, a flocculant (also derived from limestone), animal feed additives, ceramic whiteners, and in plastics, chemical manufacturing, and electrical engineering. As such, it holds significant potential for development and utilization. Additionally, it can be processed into foamed stone powder for use in building materials and as an additive to modify construction materials.