Characterization and purification of waste phosphogypsum to make it suitable for use in the plaster and the cement industry

Ennaciri, Yassine; Zdah, Ilham; Alaoui-Belghiti, Hanan El; Bettach, Mohammed

doi:10.1080/00986445.2019.1599865

Cited by 81 publications

(25 citation statements)

References 25 publications

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“…PG and obtained products were also examined by FTIR absorption. For the PG, similar bands with pure gypsum are clearly observed (Figure 2(a)) [2,14].…”

Section: Resultssupporting

confidence: 55%

“…The results of the X-ray diffraction analyze carried out by Sebbahi et al [25] and Ennaciri et al [2] demonstrated the presence of a single phase: the dihydrate CaSO4. 2H2O in Moroccan PG (Jorf Lasfar) with the existence of a minority inert phase which is silica.…”

Section: Resultsmentioning

confidence: 97%

“…The experimental protocol consists firstly to wash PG to eliminate some of the soluble impurities and suspension materials [2]. After that, about 103.3 g of this PG was dissolved in 1 liter of aqueous solution contained 0.6 M/l of NaF.…”

Section: Methodsmentioning

confidence: 99%

“…Although, PG is mainly formed by calcium sulfate (effectively dihydrate) beside numerous impurities such as: phosphates, fluorides, heavy metals, and radioelements. Hence, the presence of these impurities at higher than natural levels, can cause a severe environmental problem in long term [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

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Phosphogypsum Conversion into Calcium Fluoride and Sodium Sulfate

Ennaciri¹,

Bettach²,

Alaoui-Belghiti³

2020

ACSM

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The phosphoric acid production in the world generates a large amount of phosphogypsum beside the emission of toxic acid fluorine gas into the atmosphere, which can cause a several environmental problems. To remedying these problems, an environmental procedure permit recycling phosphogypsum waste by NaF into valuable products, was presented in this work. According the obtained results, the proposed process is feasible and leads preparing a relatively pure CaF2 and Na2SO4. This last is recommended in detergent and glass industry, while the resulting CaF2 can be utilized in metallurgical industry. The optimum conversion conditions were achieved with the exact stoichiometric phosphogypsum and NaF at reaction duration of 90 minutes under room temperature.

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“…PG and obtained products were also examined by FTIR absorption. For the PG, similar bands with pure gypsum are clearly observed (Figure 2(a)) [2,14].…”

Section: Resultssupporting

confidence: 55%

Section: Resultsmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Phosphogypsum Conversion into Calcium Fluoride and Sodium Sulfate

Ennaciri¹,

Bettach²,

Alaoui-Belghiti³

2020

ACSM

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“…Phosphogypsum (PG) is a solid waste produced during the wet production of phosphoric acid in the phosphate fertilizer industry, and its main component is CaSO 4 ·2H 2 O or CaSO 4 ·0.5H 2 O [ 1 , 2 , 3 ]. In the wet phosphoric acid production process, about 5–6 tons of phosphogypsum are discharged for every ton of phosphoric acid produced [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Optimization of Phosphogypsum Suspension Decomposition Conditions under Double Catalysis

Chen

2021

Materials

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Phosphogypsum (PG) is not only a solid waste discharged from the phosphate fertilizer industry, but also a valuable resource. After high-temperature heat treatment, it can be decomposed into SO2 and CaO; the former can be used to produce sulfuric acid, and the latter can be used as building materials. In this paper, the catalytic thermal decomposition conditions of phosphogypsum were optimized, and the effects of the reaction temperature, reaction atmosphere, reaction time and carbon powder content on the decomposition of phosphogypsum were studied. The research shows that the synergistic effect of carbon powder and CO reducing atmosphere can effectively reduce the decomposition temperature of phosphogypsum. According to the results of the orthogonal test under simulated suspended laboratory conditions, the factors affecting the decomposition rate of phosphogypsum are temperature, time, atmosphere and carbon powder content in turn, and the factors affecting the desulfurization rate are time, temperature, atmosphere and carbon powder content in turn. Under laboratory conditions, the highest decomposition rate and desulfurization rate of phosphogypsum are 97.73% and 97.2%, and the corresponding reaction conditions are as follows: calcination temperature is 1180 °C, calcination time is 15 min, carbon powder content is 4%, and CO concentration is 6%. The results of thermal analysis of phosphogypsum at different temperature rising rates show that the higher the temperature rising rate, the higher the initial temperature of decomposition reaction and the temperature of maximum thermal decomposition rate, but the increase in the temperature rising rate will not reduce the decomposition rate of phosphogypsum.

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