华南理工大学学报(自然科学版) ›› 2023, Vol. 51 ›› Issue (11): 74-81.doi: 10.12141/j.issn.1000-565X.230194

所属专题: 2023年材料科学与技术

• 材料科学与技术 • 上一篇    下一篇

硫铁尾矿矿化剂对水泥熟料煅烧及性能的影响

殷素红1 李燕梅1 丁伟敏2 段百涛3 李双喜4   

  1. 1.华南理工大学 材料科学与工程学院, 广东 广州 510640
    2.华润水泥(封开)有限公司, 广东 肇庆 526500
    3.广州市珠江水泥有限公司, 广东 广州 510460
    4.广州市越堡水泥有限公司, 广东 广州 510800
  • 收稿日期:2023-04-06 出版日期:2023-11-25 发布日期:2023-05-12
  • 作者简介:殷素红(1971-),女,博士,教授,主要从事水泥基材料、绿色低碳建筑材料、碱激发胶凝材料和固体废弃物 资源化利用研究。E-mail:imshyin@scut. edu. cn
  • 基金资助:
    住房和城乡建设部科技计划项目(2021-K-064);广东省科技创新计划项目(2021-K20-512247)

Effect of Pyrite Tailings Mineralizer on Calcination and Properties of Cement Clinker

YIN Suhong1 LI Yanmei1 DING Weimin2 DUAN Baitao3 LI Shuangxi4   

  1. 1.School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
    2.China Resources Cement (Fengkai) Co. , Ltd. , Zhaoqing 526500, Guangdong, China
    3.Guangzhou Zhujiang Cement Co. , Ltd. , Guangzhou 510460, Guangdong, China
    4.Guangzhou Yuebao Cement Co. , Ltd. , Guangzhou 510800, Guangdong, China
  • Received:2023-04-06 Online:2023-11-25 Published:2023-05-12
  • About author:殷素红(1971-),女,博士,教授,主要从事水泥基材料、绿色低碳建筑材料、碱激发胶凝材料和固体废弃物 资源化利用研究。E-mail:imshyin@scut. edu. cn
  • Supported by:
    the Science and Technology Planning Program of Ministry of Housing and Urban-Rural Development(2021-K-064);the Science and Technology Innovation Planning Program of Guangdong Province(2021-K20-512247)

摘要:

水泥工业是高耗能产业,在水泥熟料烧成过程中使用矿化剂是一种有效的节能方法。而以固体废弃物作为矿化剂还可变废为宝,实现其资源化利用。文中以硫铁尾矿作为矿化剂,研究了1 350、1 400和1 450 ℃煅烧温度下,以SO3计掺量为0、1.5%、2.0%和2.5%的硫铁尾矿烧制硅酸盐水泥熟料,并采用热分析、X射线衍射(XRD)、偏光显微镜等分析了其对水泥熟料煅烧过程、矿物组成、岩相结构和物理性能的影响。研究结果表明:以SO3计掺量为2.0%时效果最好,在此掺量下,水泥熟料中f-CaO含量由1.84%降至1.18%,可以显著改善生料的易烧性;掺入硫铁尾矿能降低生料中CaCO3分解的起始温度和峰值温度,并在低温下形成含硫硅酸二钙(2C2S·CaSO4)和硫铝酸钙(4CaO·3Al2O3·SO3)两种过渡相,使液相出现温度降低了35 ℃,可以促进熟料矿物的形成和发育,具有明显的矿化作用;掺入硫铁尾矿煅烧所得的水泥熟料性能良好,其养护3 d、28 d的抗压强度分别为33.1和61.8 MPa。

关键词: 硫铁尾矿, 矿化剂, 易烧性, 矿物组成, 微观结构, 性能

Abstract:

The cement industry is a high energy consuming industry, and the use of mineralizers in the calcination process of cement clinker is an effective energy-saving method. Using solid waste as a mineralizer can also turn waste into treasure and achieve its resource utilization. With pyrite tailings as mineralizer, this study prepared Portland cement clinker with 0, 1.5%, 2.0% and 2.5% SO3 at calcination temperature of 1 350 ℃, 1 400 ℃ and 1 450 ℃. Thermal analysis, X-ray diffraction (XRD), polarizing microscope, and other methods were used to analyze the effects of SO3 addition on the calcination process, mineral composition, petrographic structure, and physical properties of the clinker. The results show that the best effect is achieved when the content of SO3 is 2.0%. Under this proportion, the content of f-CaO in cement clinker decreases from 1.84% to 1.18%, which can significantly improve the burnability of raw meal. The addition of pyrite tailings can reduce the initial and peak temperatures of CaCO3 decomposition in raw meal, and form two transition phases of calcium sulphosilicate (2C2S·CaSO4) and calcium sulphoaluminate (4CaO·3Al2O3·SO3) at low temperature. This reduces the temperature of liquid phase by 35 ℃, promoting the formation and development of clinker minerals, and has a significant mineralization effect. The cement clinker obtained by calcination with pyrite tailings has good performance, and its compressive strength after curing for 3 days and 28 days is 33.1 and 61.8 MPa, respectively.

Key words: pyrite tailing, mineralizer, burnability, mineral composition, microstructure, performance

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