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| Application Practice of Producing High Quality Aggregate with Thin-layer Limestone |
1 Hubei Jian feng new building Materials Co., Ltd. , Daye Hubei 435115, China;
2 Tianjin Cement Industry Design & Research Institute Co., Ltd. , Tianjin 300400, China
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Abstract This study analyzed the issues existing in traditional manufactured aggregate production lines, such as suboptimal particle morphology of the products, cumbersome processes, high investment costs, and significant losses of fine sand and mud powder in the wet sand-making process. Taking a project of thin-bedded limestone and dolomite mine as an example, a dry-process aggregate production line with an annual output of 5 million tons was constructed using low-grade limestone and high-magnesium dolomite, achieving efficient utilization of mineral resources. The dry process is introduced, which acquires different particle sizes of soil-containing stone chips, crushed stones for sand-making, and 10~20mm high-quality aggregates through two-stage crushing and multi-level screening. Among them, the 0~15mm crushed stones for sand-making are further processed by a vertical roller mill grinding system to yield high-quality manufactured sand, while the 0~5 mm soil-containing stone chips are processed by a dry washing and column crushing sand-making system to produce ordinary manufactured sand. The comparison reveals that the vertical roller mill grinding products outperform the column crushing making products in terms of quality stability, particle size distribution, and morphology. The performance of concrete is comparable to that of natural sand, with lower costs, meeting the green development requirements of the sand and gravel industry and having broad application prospects.
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Published: 25 January 2025
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