Accumulation of marble waste increases pressure on the environment and human healthcare. In this work, it is focused that square-shaped nano calcium carbonate was prepared from marble polishing waste by nitric acid treatment and the effects of various preparation parameters, such as the concentration of nitric acid, reaction time and temperature on the morphology and size of nano calcium carbonate were investigated. Meanwhile, hardening accelerator was synthesized using Ca(NO₃)₂ liquid waste generated the process of preparing nano calcium carbonate as the source of calcium and Na₂SiO₃ as the source of silicon. Entire technological process is free of pollutants and will not cause secondary pollution to environment and it is eco-friendly and sustainable. Nano calcium carbonate can be achieved with an average particle size of approximately 70 nm and homogeneous under nitric acid concentration of 1.6 mol/l, reaction temperature at 55 °C, reaction time for 4 h and sodium dodecyl benzene sulfonate(SDBS) as the dispersant. Additionally, when the prepared hardening accelerator is applied to C30 concrete with content of 3%, improvement value of compressive strength of concrete are 89.3%, 21.5% and 17.3% curing 1d, 3d and 28d, respectively, and it will not cause the decline of compressive strength in the later stage.

大理石废料的积累增加了对环境和人类保健的压力。在这项工作中，重点研究是通过硝酸处理从大理石抛光废料中制备出方形纳米碳酸钙，以及硝酸的浓度，反应时间和温度等各种制备参数对形态和尺寸的影响。研究了纳米碳酸钙。同时，利用Ca（NO ₃）₂废液合成了硬化促进剂，产生了制备纳米碳酸钙为钙源和Na ₂ SiO _{3的过程。}作为硅的来源。整个工艺过程均不含污染物，不会对环境造成二次污染，具有生态友好性和可持续性。纳米碳酸钙的平均粒径约为70 nm，在硝酸浓度为1.6 mol / l，反应温度为55°C，反应时间为4 h和十二烷基苯磺酸钠（SDBS）作为分散剂的情况下均质。另外，将配制的硬化促进剂应用于含量为3％的C30混凝土时，固化1d，3d和28d的混凝土抗压强度的改善值分别为89.3％，21.5％和17.3％，不会引起下降。在后期的抗压强度。