磷石膏基挤压异形砖(PG-ESB)力学性能及孔隙三参数分布特性

doi:10.16552/j.cnki.issn1001-1625.2024.1436

摘要/Abstract

摘要： 充填挡墙的架设是磷矿充填法采矿面临的必要工艺环节之一,采用磷石膏基砌块砌筑充填挡墙是绿色开采支撑技术及磷石膏资源利用的重要途径,但常用矿场附近就地取材制备磷石膏基砌块的抗压强度、渗透性能、耐水性能等难以保障。本文提出一种由高温煅烧磷石膏、钙粉、水泥等为基本原料,挤压工艺成型的异形砖结构,通过室内制作磷石膏基挤压异形砖(PG-ESB)试块,其抗压强度满足砖体强度要求。为明确PG-ESB内部结构特征,通过低温液氮吸附试验、高压压汞试验、扫描电子显微镜(SEM)、X射线计算机断层扫描等方法研究PG-ESB的内部孔隙分布特征。PG-ESB成本低且强度满足砌筑挡墙的标准;低温液氮吸附试验、高压压汞试验、SEM等结果表明,PG-ESB存在大量尺寸为0.5~2.0 μm的孔隙;X射线计算机断层扫描结果进一步印证,PG-ESB内部存在大量不规则微孔隙,其中11.02%的微孔呈圆形,85.23%的微孔近圆形或椭圆形,3.75%的微孔呈不规则形态。为修正测试结果的不足,本文提出采用三参数分布方法完整地描述PG-ESB内部结构微孔隙分布特征。研究成果为进一步丰富和完善磷石膏基胶凝材料伤损理论提供参考。

关键词: 磷石膏, 挤压异形砖, 孔隙特性, 三参数正态分布

Abstract: The construction of filling retaining walls is one of the necessary process links in phosphate mining using the filling method. Using phosphogypsum-based blocks to build filling retaining walls is an important way to support green mining technology and the utilization of phosphogypsum resources. However, the compressive strength, permeability, and water resistance of phosphogypsum-based blocks prepared on-site near common mining sites are difficult to ensure. This paper proposed a type of special-shaped brick structure formed by extrusion process using high-temperature calcined phosphogypsum, calcium powder, cement, etc. as basic raw materials. Through indoor test block production and testing, the compressive strength of phosphogypsum-based extruded special-shaped brick (PG-ESB) meets the brick strength requirements. To clarify the internal structural characteristics of PG-ESB, the internal pore distribution characteristics of PG-ESB were studied by low-temperature liquid nitrogen adsorption test, high-pressure mercury intrusion test, scanning electron microscope (SEM), X-ray computed tomography and other methods. PG-ESB has a lower cost and its strength meets the standard for building retaining walls. The results of low-temperature liquid nitrogen adsorption test, high-pressure mercury intrusion test, and SEM show that PG-ESB has a large number of pores with a size of 0.5~2.0 μm. X-ray computed tomography results further confirm that there are a large number of irregular micropores inside PG-ESB, 11.02% of the micropores are distributed in a circular shape, 85.23% of the micropores are distributed in a nearly circular or elliptical shape, and 3.75% of the micropores are in an irregular shape. To correct the shortcomings of test results, this paper proposes to use a three-parameter distribution method to completely describe the internal structural micropore distribution characteristics of PG-ESB. The research results provide references for further enriching and perfecting the damage theory of phosphogypsum-based cementitious materials.

Key words: phosphogypsum, extruded special-shaped brick, pore characteristic, three-parameter normal distribution

中图分类号:

TU502

邓兴辉, 徐桂弘, 包立新, 徐韦洪, 陈孜伟, 杨步雷. 磷石膏基挤压异形砖(PG-ESB)力学性能及孔隙三参数分布特性[J]. 硅酸盐通报, 2025, 44(6): 2240-2249.

DENG Xinghui, XU Guihong, BAO Lixin, XU Weihong, CHEN Ziwei, YANG Bulei. Mechanical Properties and Pores Three-Parameter Distribution of Phosphogypsum-Based Extruded Special-Shaped Brick (PG-ESB)[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(6): 2240-2249.

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