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<p>The possibility of using marble waste (MARWAS) slurry as the raw material for synthesizing precipitated calcium carbonate (PCC) with desired shapes pertinent to its application as a filler in handmade papermaking was investigated in this study. Aiming to utilize a waste material for synthesizing a useful product, the MARWAS slurry was converted into CaCl<sub>2</sub> and subsequently carbonated in the presence of NH<sub>3</sub> in a bubble column reactor to synthesize submicron PCC particles. The synthesized PCC products were cubic-, rosette-, and spherical-shaped monodispersed particles of average size 188, 750, and 785&#xa0;nm, respectively. The physical, mechanical, and optical properties of filler-loaded papers were also determined. The maximum filler retention of 87.95% was obtained with 20% loading of the rosette particles. For the same, tear strength increased by 31%, but burst strength remained unchanged compared to unloaded papers. However, the improvements in the optical properties of the filler-loaded papers were higher with the cubic and spherical particles than with the rosette type. An economic feasibility study made at 15% filler loading, the maximum level usually applied in Indian paper products showed that the product cost gets reduced by 29.6% if PCC made from MARWAS slurry is used instead of TiO<sub>2</sub>.</p> Graphical Abstract <p></p>

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A comprehensive study for the utilization of precipitated calcium carbonate synthesized from marble waste slurry as filler in handmade papermaking: methodology and economic feasibility

  • 期刊论文

  • 发表日期：

    2025年9月15日

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  • Vinod Kumar Dhakad,
  • Susanta Kumar Jana

摘要

The possibility of using marble waste (MARWAS) slurry as the raw material for synthesizing precipitated calcium carbonate (PCC) with desired shapes pertinent to its application as a filler in handmade papermaking was investigated in this study. Aiming to utilize a waste material for synthesizing a useful product, the MARWAS slurry was converted into CaCl2 and subsequently carbonated in the presence of NH3 in a bubble column reactor to synthesize submicron PCC particles. The synthesized PCC products were cubic-, rosette-, and spherical-shaped monodispersed particles of average size 188, 750, and 785 nm, respectively. The physical, mechanical, and optical properties of filler-loaded papers were also determined. The maximum filler retention of 87.95% was obtained with 20% loading of the rosette particles. For the same, tear strength increased by 31%, but burst strength remained unchanged compared to unloaded papers. However, the improvements in the optical properties of the filler-loaded papers were higher with the cubic and spherical particles than with the rosette type. An economic feasibility study made at 15% filler loading, the maximum level usually applied in Indian paper products showed that the product cost gets reduced by 29.6% if PCC made from MARWAS slurry is used instead of TiO2.

Graphical Abstract