Phosphogypsum utilization in fired bricks: Radioactivity assessment and durability

Ajam, L.; Hassen, A. Ben El Haj; Reguigui, N.

doi:10.1016/j.jobe.2019.100928

Cited by 19 publications

(4 citation statements)

References 26 publications

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“…Phosphogypsum is a main industrial by-product from wet method phosphoric acid production. [1,2] The main component is CaSO 4 . A large amount of untreated phosphogypsum is mainly stored on land and dumped into the sea, resulting in a series of environmental pollution in water, soil, and air.…”

Section: Introductionmentioning

confidence: 99%

Two‐step thermal decomposition mechanism of phosphogypsum for resource utilization

et al. 2022

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In this work, the reduction-oxidation two-step method was used for investigating the resource utilization of phosphogypsum. The influences of different decomposition conditions were investigated, including the reducing process and oxidizing process. The reductive organic sulphide in lignite reacted with CaSO 4 and improved the CaSO 4 decomposition rate. High Fe 2 (SO 4 ) 3 content and anhydrous air flow rate promoted the formation of Fe-Ca-Ox, decreasing the CaSO 4 decomposition rate. H 2 O derived from CH 4 reacted with lignite to consume the solid reducing agent. In the reducing process, CaSO 4 reacted with CH 4 and lignite to form CO, CO 2 , H 2 O, and CaS. In the oxidizing process, CaS was mainly oxidized into CaO, SO 2 , and element S. Through a two-step decomposition process (reduction with CH 4 and oxidation with air), the decomposition temperature of phosphogypsum decreases and the decomposition efficiency is improved. Meanwhile, the residual lignite was oxidized into CO and CO 2 . Therefore, it is meaningful and valuable.

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Section: Introductionmentioning

confidence: 99%

Two‐step thermal decomposition mechanism of phosphogypsum for resource utilization

et al. 2022

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“…Thus, the use of PG in road structures has been studied. But the results were not encouraging, and the attempts were quickly abandoned in France as in the USA (Florida) because of the heavy rains [7]. On the other hand, its use in regions with low rainfall, such as southern Tunisia, remains possible [8].…”

Section: Introductionmentioning

confidence: 99%

“…One of the most studied uses for PG is the manufacture of bricks, whether non-fired or fired bricks [1,[21][22][23]. Ajam et al [7,24] used PG for the manufacture of fired bricks and studied its radioactivity. Their work has shown that the radioactivity measured is acceptable and below the limits prohibited by standards.…”

Section: Introductionmentioning

confidence: 99%

Pressed non-fired bricks from phosphogypsum waste for non-load bearing wall

Kammoun

2021

CEJ

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In several countries of the world, phosphogypsum represents a large quantity of waste that poses serious problems of environmental and groundwater pollution. This study aims at recovering phosphogypsum, in its raw state without treatment, in the manufacture of non-load-bearing non-fired bricks. The study starts with the analysis of the radionuclide activity of the materials constituting the bricks, in particular phosphogypsum, in order to avoid any human health problems after the manufacture and use of the bricks. Then, several compositions are tested with several preservation methods in order to optimize the composition. The physical, chemical and mechanical resistance is determined. The results show the possibility to produce non-load-bearing bricks based on untreated phosphogypsum which comply with the standards requirements, using low energy. Indeed, among the considered mixtures, two compositions (60% of PG and of 75% of PG) perfectly verify the physical and mechanical tests. Also, storage of the mixtures for two days in the laboratory and then three days in an oven at 70°C, allows to obtain the best resistance to compression. Thus, the obtained resistance is much higher than the minimum value required for non-load-bearing bricks.

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“…PG is a source of calcium, which, in addition to being a CO 2 sequestering agent, is a construction material [14,15]. Research has demonstrated the high efficiency of portlandite precipitation by PG dissolution using an alkaline soda solution [16]; PG, reacting with ammonia, may be converted into ammonium sulphate and precipitated calcium carbonate [17], yielding reaction conversion efficiencies of >95% [18].…”

Section: Introductionmentioning

confidence: 99%

Environmental Impact of Phosphogypsum-Derived Building Materials

Romero-Hermida

Alés

Hurtado

et al. 2020

IJERPH

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The aim of the present work was to characterize the products obtained from the treatment of phosphogypsum residue by means of two recovery routes, and also to evaluate the concentrations of heavy metals and radionuclides in the materials obtained and their leachates. In this way, it is possible to determine how the most hazardous components of phosphogypsum behave during procedures until their stabilization through CO2 fixation. This study provides an initial estimate of the possibilities of reusing the resulting products from a health and safety risk standpoint and their potential polluting capacity. The phases resulting from the transformations were controlled, and the behaviour of standard mortars manufactured from the resulting paste lime was studied. In all cases, an additional control of the leachate products was performed.

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Phosphogypsum utilization in fired bricks: Radioactivity assessment and durability

Cited by 19 publications

References 26 publications

Two‐step thermal decomposition mechanism of phosphogypsum for resource utilization

Two‐step thermal decomposition mechanism of phosphogypsum for resource utilization

Pressed non-fired bricks from phosphogypsum waste for non-load bearing wall

Environmental Impact of Phosphogypsum-Derived Building Materials

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