张朋娟, 宋学锋. 煅烧工艺与钙硅比对水硬性石灰组成及性能的影响[J]. 矿业科学学报, 2023, 8(5): 725-732. DOI: 10.19606/j.cnki.jmst.2023.05.014
引用本文: 张朋娟, 宋学锋. 煅烧工艺与钙硅比对水硬性石灰组成及性能的影响[J]. 矿业科学学报, 2023, 8(5): 725-732. DOI: 10.19606/j.cnki.jmst.2023.05.014
Zhang Pengjuan, Song Xuefeng. Effect of calcination process and calcium-silica ratio on the composition and properties of hydraulic lime[J]. Journal of Mining Science and Technology, 2023, 8(5): 725-732. DOI: 10.19606/j.cnki.jmst.2023.05.014
Citation: Zhang Pengjuan, Song Xuefeng. Effect of calcination process and calcium-silica ratio on the composition and properties of hydraulic lime[J]. Journal of Mining Science and Technology, 2023, 8(5): 725-732. DOI: 10.19606/j.cnki.jmst.2023.05.014

煅烧工艺与钙硅比对水硬性石灰组成及性能的影响

Effect of calcination process and calcium-silica ratio on the composition and properties of hydraulic lime

  • 摘要: 煅烧工艺、原料钙硅比是影响天然水硬性石灰(NHL)矿物组成及性能的关键因素。本文以不同化学组成泥质石灰石尾矿为原料,采用不同煅烧工艺制备了NHL。采用正交试验与单因素试验相结合的方式对所制备NHL的矿物组成及抗压强度进行研究,分析了煅烧工艺与钙硅比对其性能的影响规律。研究结果表明:随着煅烧温度升高,NHL中气硬性矿物CaO含量减少,水硬性矿物硅酸二钙(Ca2SiO4,C2S)含量增加;煅烧温度对NHL的矿物组成及抗压强度影响最为显著,保温时间与升温速率次之;在煅烧温度1 000~1 100 ℃范围内,利用给定的泥质石灰石尾矿制备的天然水硬性石灰满足NHL2、NHL3.5强度等级要求;当钙硅比在3.55~6.76范围内,NHL抗压强度随钙硅比的增大先降低后升高,而CaO含量呈增大趋势。

     

    Abstract: The calcination process and the ratio of to calcium to silicon in raw materials are the key factors affecting the mineral composition and properties of natural water hard lime(NHL). This study prepared NHL was by different calcination processes using argillaceous limestone tailings with different chemical compositions as raw materials. This paper studied the mineral composition and compressive strength of the prepared NHL by a combination of orthogonal and single-factor tests, and analyzed the effect of calcination process and calcium-silica ratio on its performance. Results showed that: ① With the increase of calcination temperature, the content of CaO in NHL decreased, and the content of dicalcium silicate(Ca2SiO4, C2S)increased in NHL. ② Calcination temperature had the most significant effect on the mineral composition and compressive strength of NHL, followed by holding time and heating rate. ③ In the calcination temperature range of 1 000~1 100 ℃, the natural hydrostatic lime prepared by the given argillaceous limestone tailings meets the requirements of NHL2 and NHL3.5 strength grades. ④ When the calcium-silicon ratio is in the range of 3.55~6.76, the compressive strength of NHL decreases and then increases with the increase of calcium-silicon ratio, while the CaO content shows continuous increases.

     

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