Feasibility Study and Practical Application of Marble Sand Making

1. Raw Material Characteristics and Processing Suitability
As a carbonate mineral formed by the metamorphism of sedimentary rocks, marble's physical properties determine the feasibility of sand making. Laboratory data show that the compressive strength of high-quality marble is generally above 50 MPa, with some varieties even reaching 120 MPa, fully meeting the strength requirements for manufactured sand in "Construction Sand" (GB/T14684-2022). It is worth noting that brown marble with an iron content exceeding 0.5% requires acid washing, otherwise it will affect the durability of the concrete.

2. Process Configuration and Key Technologies
Currently, mainstream sand making production lines use a three-stage crushing process: a jaw crusher performs primary coarse crushing (feed size ≤ 60 mm), a cone crusher performs secondary crushing, and a vertical shaft impact crusher provides final fine crushing and shaping. For example, a stone processing company in Zhejiang Province uses a VSI6X1263 sand making machine to process marble into adjustable graded sand with a fineness modulus of 2.6-3.0, achieving a consistently high yield of over 85%.

3. Economic and Environmental Benefit Analysis

Compared to natural river sand, manufactured marble sand offers significant cost advantages. Raw material costs are only 1/5-1/3 of those of natural sand, and the transportation radius can be controlled within 300 kilometers. Furthermore, the use of a closed production line with a pulse dust removal system keeps dust emission concentrations below 10 mg/m³. Furthermore, waste residue can be filtered and converted into lightweight building materials, achieving near-zero waste.

4. Expanded Application Scenarios

Currently, manufactured marble sand has been successfully used in:

High-speed rail track bed filling (compressive strength ≥ 60 MPa);

Marine engineering anti-corrosion concrete (chloride ion content must be controlled);

3D printing building mortar (continuously graded particle size 0.15-4.75 mm);