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

Ma, Baoguo; Jin, Zihao; Su, Ying; Lu, Wenda; Qi, Huahui; Hu, Penghui

doi:10.1016/j.conbuildmat.2019.117346

Cited by 66 publications

(10 citation statements)

References 28 publications

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“…The basalt fiber can increase the open porosity and form more interconnected pores to further improve the sound absorption property. The optimized content of basalt fiber and expanded perlite are 1 wt.% and 6 wt.%, respectively [74]. A recent study investigated the feasibility of using PG to prepare porous soundabsorbing composite.…”

Section: Sustainable Compositesmentioning

confidence: 99%

Low-Carbon Sustainable Composites from Waste Phosphogypsum and Their Environmental Impacts

et al. 2021

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Phosphogypsum (PG) is an industrial waste from the production of phosphoric acid and phosphate fertilizer. Disposal and landfill of PG pose significant environmental problems due to its hazardous components. Although many researchers have explored the possibility of PG recycling, challenges still exist before it can be high-effectively reused. In particular, a great deal of recent attention has been attracted to explore using PG as raw material to manufacture sustainable composites. The impurities movement, recycling efficiency, and environmental impacts have to be further investigated. This review article summarized the state of the art of the purification process, application areas, and the environmental impacts of PG waste. The main challenges and potential application approaches were discussed. This article is focused on reviewing the details of the PG reusing which benefits the readers on learning the knowledge from previous efforts. The main challenges of reusing PG were discussed from the chemical, physical, and materials perspectives.

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Section: Sustainable Compositesmentioning

confidence: 99%

Low-Carbon Sustainable Composites from Waste Phosphogypsum and Their Environmental Impacts

et al. 2021

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“…The production of binders at elevated temperatures and atmospheric pressure (autoclave-free technology) is also considered in the works of various researchers [17,18]. However, it should be noted that for all the simplicity and attractiveness of the technology, even through the use of various additional techniques, this method can only produce astringent β-modifications.…”

Section: Plaster Bindersmentioning

confidence: 99%

“…Studies by Ma et al [18] considered the possibility of manufacturing phosphogypsum (Hubei Yihua Fertilizer Inc., Hubei, China), a porous sound-absorbing material, based on β-hemihydrate obtained by low-temperature calcination (160 °С). It is shown that with the following ratios of the components of the raw material mixture, by weight of the binder: pore-forming agent, 1 % basalt fiber and 6 % expanded perlite, it is possible to obtain a material that meets the requirements for the noise reduction coefficient of the Chinese standard (GB/T 16731-1997).…”

Section: Building Materialsmentioning

confidence: 99%

Utilization of Gypsum-Bearing Wastes in Materials of the Construction Industry and Other Areas

Alfimova

Pirieva

Titenko

2021

Construction Materials and Products

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rational environmental management is one of the priorities of the technological development of the Russian Federation and most countries of the world. Particularly important in this area is the work undertaken with previously generated and accumulated waste, a whole group of which is gypsum-bearing wastes (GBW), which includes by-products of various industries: phosphogypsum, borogypsum, chlorogypsum, ferrogypsum, citrogypsum, vitamin gypsum, etc. GBW features are similar compositions, prevalence, perennial volumes of stored reserves with stable dynamics of annual growth. This determines the relevance of research on the development of a unified methodology for converting GBW of various types into target products particularly for construction purposes, providing maximum energy efficiency and minimal generation of secondary waste. The starting point of the research is the monitoring of approaches developed by the scientific community which are presented in the article. It is shown that researchers are exploring several main areas of GBW conversion: components of Portland cement and clinker; single and multicomponent binders; direct raw materials for the production of building materials; and road construction. The latter two directions have the greatest potential capacity for the consumption of GBW. The general level of research on the issue is not exhaustive, but has the potential to improve on existing methods of processing and application and promote the search for new and more efficient methods

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“…The storage of phosphogypsum not only encroaches on the land, but also causes significant environmental pollution [1]. Although some attempts have been made to use phosphogypsum as a wallboard and building blocks in the field of construction [2][3][4], the poor water-resistance of phosphogypsum severely restricts its widespread application [5]. Many scholars have carried out researches to solve this problem.…”

Section: Introductionmentioning

confidence: 99%

The Coupling Effect of Organosilicon Hydrophobic Agent and Cement on the Water Resistance of Phosphogypsum

Chong

Gao

et al. 2022

Materials

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The objective of this paper is to investigate the coupling effect of cement and organosilicon hydrophobic agents on the water resistance of phosphogypsum. Different weight ratios of Portland cement were added to adjust the alkalinity of this system and further improve the work efficiency of the organosilicon hydrophobic agents. Some macroscopic performances, such as the water absorption, the compressive strength, the flexural strength, and the softening coefficient, were measured to characterize the water-resistance of phosphogypsum. The microscopic characteristics were analyzed via contact angle tests, scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) to understand the mechanism of organosilicon hydrophobicity. The results indicated that both the compressive and flexural strengths of phosphogypsum first increased and then decreased with the increase of organosilicon hydrophobic agents. Meanwhile, the surface contact angle continued to increase and the softening coefficient exhibited an obvious increase. When the hydrophobic agent was combined with Portland cement, the softening coefficient of phosphogypsum further increased from 0.80 to 0.99, while the water absorption rate was significantly reduced from 16.0% to 0.8%. Microscopic tests proved that the hydrophobic organic molecules can be polymerized under the high alkalinity, and promote the formation of a hydrophobic film, thus significantly improving the water-resistance of phosphogypsum.

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

Cited by 66 publications

References 28 publications

Low-Carbon Sustainable Composites from Waste Phosphogypsum and Their Environmental Impacts

Low-Carbon Sustainable Composites from Waste Phosphogypsum and Their Environmental Impacts

Utilization of Gypsum-Bearing Wastes in Materials of the Construction Industry and Other Areas

The Coupling Effect of Organosilicon Hydrophobic Agent and Cement on the Water Resistance of Phosphogypsum

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