Revolutionizing Construction: Harnessing Phosphorus Tailings for Lightweight, High-Strength Wall Materials

IF 1.5 4区 材料科学 Q3 Chemistry
Haiyang Wang, Hao Zhang, Hong Cao, Jun Xue,  Arramel, Jing Zou, Jizhou Jiang
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Abstract

The beneficiation of low-grade phosphate ore leads to the production of a substantial quantity of phosphate tailings, thereby not only occupying land but also endangering the environment and potentially posing safety concerns. In this work, extrusion molding, steam-curing, and calcined phosphate tailings are employed to fabricate lightweight wall materials with superior strength. It is found that the wall material has a special structure of interwoven needle-like crystals as a way to provide high flexural strength. The main composition of 34.94% phosphate tailings, 36.75% calcined phosphate tailings, 16.64% silica fume, 6.67% anhydrous magnesium sulfate is required to achieve an optimal maintenance process for 4 h of heat preservation at 120 °C saturated vapor pressure environment. The prepared wall materials yield a flexural strength of 24.9 MPa, compressive strength of 18.9 MPa, softening coefficient of 0.81, apparent density of 1.594 g cm−3, and thermal conductivity of 0.269 w/(m K), which meet the requirements of the Chinese standard “Lightweight strip board for building partition walls”. Moreover, the calculation revealed that phosphate tailings have a comprehensive utilization rate of 77.23%, effectively mitigating the issues arising from their accumulation and serving as an efficient means of utilizing solid waste derived from phosphate tailings.

Abstract Image

建筑业的变革:利用磷尾矿制造轻质高强度墙体材料
低品位磷酸盐矿的选矿过程会产生大量磷酸盐尾矿,不仅占用土地,还会危及环境并带来潜在的安全问题。在这项工作中,采用挤压成型、蒸汽固化和煅烧磷酸盐尾矿来制造具有优异强度的轻质墙体材料。研究发现,墙体材料具有针状晶体交织的特殊结构,可提供较高的抗弯强度。主要成分为 34.94% 的磷酸盐尾矿、36.75% 的煅烧磷酸盐尾矿、16.64% 的硅灰、6.67% 的无水硫酸镁,需要在 120 °C 饱和蒸汽压环境下保温 4 小时才能达到最佳养护工艺。制备的墙体材料抗折强度为 24.9 MPa,抗压强度为 18.9 MPa,软化系数为 0.81,表观密度为 1.594 g cm-3,导热系数为 0.269 w/(m K),符合中国标准《建筑隔墙用轻质条板》的要求。此外,计算显示,磷矿尾矿的综合利用率为 77.23%,有效缓解了磷矿尾矿堆积带来的问题,是磷矿尾矿固体废弃物的有效利用方式。
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来源期刊
CiteScore
2.50
自引率
6.70%
发文量
121
审稿时长
1.9 months
期刊介绍: The journal Crystal Research and Technology is a pure online Journal (since 2012). Crystal Research and Technology is an international journal examining all aspects of research within experimental, industrial, and theoretical crystallography. The journal covers the relevant aspects of -crystal growth techniques and phenomena (including bulk growth, thin films) -modern crystalline materials (e.g. smart materials, nanocrystals, quasicrystals, liquid crystals) -industrial crystallisation -application of crystals in materials science, electronics, data storage, and optics -experimental, simulation and theoretical studies of the structural properties of crystals -crystallographic computing
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