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Utilization of hemihydrate phosphogypsum for the preparation of porous sound absorbing material

机译：利用半水合磷石膏制备多孔吸声材料

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摘要

Phosphogypsum (PG) as an industrial by-product of phosphoric acid production causes severe environmental pollution. Beta-hemihydrate phosphogyspum (beta-HPG) obtained by low temperature calcination of PG can be used for the preparation of functional building materials to achieve its utilization. This work aims to utilize beta-HPG as raw material for the preparation of porous sound absorbing material (PSAM). The effects of pore-forming agent, basalt fiber and expanded perlite on the properties of PSAM were investigated systematically by the analyses of sound absorption coefficient, mechanical strength, bulk density, open porosity and microstructure. In addition, the sound absorption properties of PSAM were evaluated by noise reduction coefficient in accordance with the corresponding Chinese standard. The results show that pore-forming agent and basalt fiber can form a large number of interconnected pores in the PSAM, and expanded perlite can further increase the sound absorption properties of PSAM by the combination of interconnected pore structure and cavity resonance sound absorption structure. High efficiency sound absorbing material can be prepared with 0.6 wt% pore-forming agent, 1 wt% basalt fiber and 6 wt% expanded perlite by the weight of p-HPG. This work provides an effective and high value-added way for the utilization of PG. (C) 2019 Elsevier Ltd. All rights reserved.
机译：磷石膏（PG）作为磷酸生产的工业副产品会严重污染环境。通过PG的低温煅烧获得的β-半水合磷酸石膏（β-HPG）可用于制备功能性建筑材料以实现其利用。这项工作旨在利用β-HPG作为原料来制备多孔吸声材料（PSAM）。通过吸声系数，机械强度，堆积密度，开孔率和微观结构的分析，系统地研究了成孔剂，玄武岩纤维和膨胀珍珠岩对PSAM性能的影响。此外，根据相应的中国标准，通过降噪系数评估了PSAM的吸声性能。结果表明，成孔剂与玄武岩纤维可在PSAM中形成大量的连通孔，而膨胀珍珠岩可通过连通孔结构和空腔共振吸声结构的结合，进一步提高PSAM的吸声性能。高效吸声材料可以用0.6 wt％的成孔剂，1 wt％的玄武岩纤维和6 wt％的膨胀珍珠岩（按p-HPG的重量）制备。这项工作为PG的利用提供了有效且高附加值的方法。 （C）2019 Elsevier Ltd.保留所有权利。

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