Thermal Study of Tunisian Phosphogypsum for Use in Reinforced Plaster

Mechi, Nabawia; Ammar, Mohamed; Loungou, Mouna; Elaloui, Elimame

doi:10.9734/bjast/2016/25728

Cited by 10 publications

(5 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The presence of these elements could be attributed to the ore of the phosphate used in the industrial process. This composition was similar to that cited by Mechi et al [ 26 ]. The treatment of PGF did not significantly affect the chemical composition but it increased the CaO/SO 3 ratio from 0.83 to 0.95.…”

Section: Resultssupporting

confidence: 91%

“…The FTIR spectra of the PG in the different states ( Figure 4 ) confirmed two results (one qualitative and the other quantitative) shown by the X-ray diffractograms, namely, that the PG was mainly composed of gypsum. This was represented by the peaks of SO 4 2− lying at 594 cm −1 , 1099 cm −1 and 2132 cm −1 [ 26 , 27 , 28 ], as shown in Figure 5 and Figure 6 . The second result consisted of the quantitative variation in the peaks of the water at 1620 cm −1 , which was attributed to the vibrations of the OH groups of the water.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

The Development of a New Phosphogypsum-Based Construction Material: A Study of the Physicochemical, Mechanical and Thermal Characteristics

et al. 2021

Self Cite

View full text Add to dashboard Cite

Phosphogypsum (PG) is a waste (or by-product) of the production of phosphoric acid, a basic constituent in the manufacturing of modern fertilizers. The annual production of phosphogypsum in Tunisia is currently estimated to be 10 million tons. Its storage in slag in close proximity to production plants generates pollution problems; however, valorization may be a solution. The present paper proposes a simple process for the valorization of this by-product into a construction material. Several physicochemical characterizations are used to prove the characteristics of samples. The chemical composition shows that PG is a gypsum compound with several impurities. The morphological analyses show that the powder materials are mesoporous with a lower specific area. The structural characterizations show that these solids play the role of a water pump as the degree of hydration changes from 2 to 0 and vice versa, depending on the temperature. Mechanical and thermal analyses show that the prepared formulation is brittle and insulating, which presents opportunities for it to be used as a decoration material.

show abstract

Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

The Development of a New Phosphogypsum-Based Construction Material: A Study of the Physicochemical, Mechanical and Thermal Characteristics

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…Thus, world production of PG, mainly composed of calcium sulphate dehydrate (CaSO4.2H2O), is enormous. It exceeds 280 million tonnes per year [2] of which 22 million tonnes in China [3], 10 million tonnes per year in Tunisia [4] and more than 6 million tonnes in India [5].…”

Section: Introductionmentioning

confidence: 99%

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

Kammoun

2021

CEJ

View full text Add to dashboard Cite

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.

show abstract

“…Pollution problems resulting from (PG) which is a synthetic by-product created during the commercial manufacture of phosphoric acid by wet process [1]. For every ton of phosphoric acid produced, about 4-5 tons of phosphogypsum are generated [2]. The (PG) is composed of hydrated calcium sulfate mixed with some impurities such as P 2 O 5 , fluorine, organic matter, heavy metals and radioactive elements [3,4].…”

Section: Introductionmentioning

confidence: 99%

Treatment and Purification of Phosphogypsum

Rafie¹,

Ghetany²,

Aila

et al. 2019

Egypt. J. Chem.

View full text Add to dashboard Cite

P RODUCTION of phosphoric acid and phosphate fertilizers are still generating pollution problem. The (PG) wasted phosphogypsum by product created through the manufacture consists of many valuable materials to be recovered. For each ton phosphoric acid produced, about 4 -5 tons (PG) waste was generated. The (PG) waste is generally dumped near the production plants causing contamination of ground water, soil and large extensions of land were occupied by (PG) piles. The present work proposed recovery of (PG) waste after purification, while XRF was used to present its main constituents. Valuable materials such as calcium carbonate can be recovered for soil conditioning by sea water treatment. Sodium sulphate was prepared form (PG) purified too and detected by XRD. SEM and EDAX were used to compare between purified and (PG) waste. Solar thermal energy was used to calcine (PG) waste rocks and minimize electrical energy use successfully.

show abstract

Thermal Study of Tunisian Phosphogypsum for Use in Reinforced Plaster

Cited by 10 publications

References 17 publications

The Development of a New Phosphogypsum-Based Construction Material: A Study of the Physicochemical, Mechanical and Thermal Characteristics

The Development of a New Phosphogypsum-Based Construction Material: A Study of the Physicochemical, Mechanical and Thermal Characteristics

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

Treatment and Purification of Phosphogypsum

Contact Info

Product

Resources

About