A comparative assessment of the suitability of phosphogypsum from different origins to be utilised as the binding material of construction products

Fornés, Ignacio Villalón; Vaičiukynienė, Danutė; Nizevičienė, Dalia; Doroševas, Viktoras; Michalik, B.

doi:10.1016/j.jobe.2021.102995

Cited by 13 publications

(4 citation statements)

References 36 publications

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“…Given this, harmless, reduced disposal, and cyclic utilization of phosphogypsum is urgently needed in the phosphorus chemical industry . Currently, phosphogypsum derived from phosphoric acid plant is extensively explored and utilized in construction materials, − chemical industry, − and agriculture. , …”

Section: Introductionmentioning

confidence: 99%

Process Optimization and Mechanism Study for Sulfur Recovery from High-Silica Phosphogypsum via Carbothermal Reduction Smelting

Wang,

Hou,

et al. 2024

ACS Omega

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Phosphogypsum produced from wet-processed phosphoric acid mainly consists of calcium sulfate dihydrate, which is an important sulfur resource. The traditional sulfuric acid and cement process based on phosphogypsum suffers from unstable cement quality owing to impurities such as phosphorus and fluorine and kiln ringing caused by the low-melting phase. This study investigated sulfur recovery and value-added utilization of liquid slag from high-silica phosphogypsum via carbothermal reduction smelting. A phosphogypsum ingredient (PGI) system was constructed by adding appropriate amounts of silica, alumina, magnesium oxides, and iron oxides to meet the production requirements of slag wool. Carbothermal reduction smelting experiments suggested that the temperature and C/S molar ratio significantly affected the desulfurization rate and phase structure of the slag. More than 97.44 wt % of sulfur could be recovered with a C/S molar ratio of 0.5−0.8 at 1300 °C or above in the molten state, and the molten slag was an amorphous magnesium−calcium−aluminosilicate. The PGI desulfurization mechanism is discussed based on the phase transformation and slag microstructure evolution.

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Section: Introductionmentioning

confidence: 99%

Process Optimization and Mechanism Study for Sulfur Recovery from High-Silica Phosphogypsum via Carbothermal Reduction Smelting

Wang,

Hou,

et al. 2024

ACS Omega

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“…There are several long-range directions for its further use in various sectors of the economy. It stands to mention the effectiveness of using phosphogypsum as an ameliorant in agriculture [4][5][6] to improve the condition of the soil cover and as a bonding agent in the construction industry [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Utilization of phosphogypsum from industrial dumps as an element of environmentally safe energy- and resource-conserving technologies

Pikarenia,

Orlinska,

Hapich

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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The paper discusses the problem of disposal and processing of phosphogypsum dumps as an element of environmentally safe energy- and resource-conserving technologies. The process of impact and possibility of phosphogypsum pre-treatment with weak electric fields to improve its physical and mechanical properties was studied. Two samples of different origin phosphogypsum, which are located in dumps on the territory of the Kamianske City (Ukraine), were used as research material. The research was conducted on samples of the following fractions: 1.0–2.0, 0.4–1.0, 0.1–0.4 mm. Further, balls were formed from the treated phosphogypsum and raw materials to study their compressive strength. The experiment was performed on a pellet strength meter, which operates in the range of 0–2.5 kgf/grain. Phosphogypsum balls, treated with electric current, did not collapse with the maximum values of the device. According to the research results, it was established that preliminary treatment with a low electric current leads to a decrease in the dehydration temperature of phosphogypsum, and the subsequent hydration allows to obtain a material with higher compressive strength properties. This substantiates the potential possibility of involving research results to obtain a cheaper product and will allow to liquidate multi-ton deposits of phosphogypsum.

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“…A brief survey of the literature reveals that little research has been devoted to the process mineralogy of PG in the academic community [31,32]. This study intends to employ the research method of process mineralogy to explore the mineral phase composition, the dissociation degree of essential minerals and the occurrence characteristics of the colorcausing mineral phase in PG.…”

Section: Introductionmentioning

confidence: 99%

Study on Mechanisms for Improving Quality and Whiteness of Phosphogypsum Based on Process Mineralogy Analysis

Dong,

Chi,

Guo

et al. 2024

Minerals

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Because of its low whiteness, complex composition, radioactivity and high impurity percentage, the usage of phosphogypsum (PG) resources is limited. A theoretical foundation for upgrading and bleaching PG can be obtained by researching the presence and status of impurities in the material and its symbiotic connection with gypsum. This paper makes use of an automatic mineral phase analyzer, optical microscope, XRF, XRD and SEM-EDS. After analyzing the chemical makeup of PG, phase composition and particle size composition, the distribution law and symbiotic interaction between impurities and gypsum in various particle sizes were discovered. Using a flotation test, the process mineralogy analysis results were confirmed. According to the XRF and XRD study results, the primary impurity elements in PG are Si, P and F. Si is more abundant in PG that is between +850 μm and −37.5 μm in size. The concentrations of gypsum and quartz in PG are 82.59% and 8.73%, respectively, according to the results of XRD and process mineralogy. The monomer dissociation degree of the gypsum mineral phase is as high as 90.47%. Gibbsite and pyrite are the primary causes of the low whiteness of PG and are clearly related to the quartz mineral phase. The coupling process of “flotation + pickling” produced purified PG with a purity of 95.35%, whiteness of 70.76% and SiO2 content of 2.73%. The quality met the first-class index standards of PG in GB/T23456-2018.

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A comparative assessment of the suitability of phosphogypsum from different origins to be utilised as the binding material of construction products

Cited by 13 publications

References 36 publications

Process Optimization and Mechanism Study for Sulfur Recovery from High-Silica Phosphogypsum via Carbothermal Reduction Smelting

Process Optimization and Mechanism Study for Sulfur Recovery from High-Silica Phosphogypsum via Carbothermal Reduction Smelting

Utilization of phosphogypsum from industrial dumps as an element of environmentally safe energy- and resource-conserving technologies

Study on Mechanisms for Improving Quality and Whiteness of Phosphogypsum Based on Process Mineralogy Analysis

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