Louisiana State University LSU Digital Commons LSU Master's Theses Graduate School 2003 The determination of appropriate phosphogypsum: Class C fly ash : Portland Type II cement compositions for use in marine applications Pradyot Sudhakar Deshpande Louisiana State University and Agricultural and Mechanical College, [email protected] …
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Phosphogypsum (PG) is a by-product produced during the wet process of phosphoric acid (H3PO4) production from natural phosphate rocks. Approximately 4–6 tons of PG is produced per ton of ...
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The increasing demand for rare earth elements (REEs), especially from new and innovative technology, has strained their supply, which makes the exploration of new REE sources necessary, for example, the recovery of REEs from phsophogypsum (PG). PG is a byproduct during the wet production of phosphoric acid, which is an attractive …
The P 2 O 5 and F are found in three forms: (i) on the surface of phosphogypsum crystals with water-soluble compounds (H 3 PO 4, Ca(H 2 PO 4) 2 ·H 2 O, NaF); (ii) substituted in the lattice of phosphogypsum crystal (effectively solid solutions of CaHPO4·2H 2 O or Na 2 SiF 6) in PG; and (iii) as insoluble compounds (Ca 3 (PO 4) …
Reaction Mechanism of Suspended Decomposition of Phosphogypsum. In order to analyze the role of solid–gas reactions and solid–solid reactions in the thermal decomposition of phosphogypsum, an experimental study was carried out in an air-blown suspension furnace at a fixed temperature (1180 °C) and a fixed carbon powder content …
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Phosphogypsum (PG), a byproduct during the phosphoric acid production process, also known as the wet process, contains complex and diverse impurities, resulting in low utilization and considerable accumulation. This leads to a massive waste of land resources and a series of environmental pollution problems. Given the current urgent …
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O'Brien (1997) assumed a 226 Ra activity concentration of 400 Bq/kg in phosphogypsum and calculated the annual effective dose from gamma radiation for a person continually occupying the room of dimensions up to 5 m × 5 m × 3 m lined from all the walls and ceiling by 10-mm wallboard, and found that it does not exceed 0.13 mSv.
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When PG are used for e.g., agriculture or construction purposes, nanoparticles (NPs) can be re-suspended by Aeolian and fluvial processes. Here we …
The failure of suspended ceiling systems is one of the most widely reported types of nonstructural damage in large-span spatial structures after an earthquake. In an effort to mitigate this damage in future events, this study evaluates the seismic performance of suspended ceilings attached to rigid and flexible supporting structures subjected ...
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In this study, we investigated a coarse phosphogypsum containing 49.63% SO3, 41.41% CaO, 10.68%, 4.47% SiO2, 1.28% P2O5, 0.11% F, CaSO4·2H2O purity of 80.65%, and whiteness of 27.68. Phosphogypsum contains calcium sulfate dehydrate as the main mineral, with small amounts of brushite, quartz, muscovite, and zoisite. Harmful …
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2.1 Phosphogypsum Generation Processes. The wet and dry process are the two main commercial processes used to produce phosphoric acid from natural phosphate. The dry process consists of a thermal reduction of rock phosphate at 2000 °C using an electrical furnace in the presence of coke or silica.
The discharge of lead and cadmium wastewater, along with the pollution caused by phosphogypsum, represents a particularly urgent environmental issue. This study employed a straightforward hydrothermal method to convert phosphogypsum into porous calcium silicate hydrate (P-CSH), which was then used to remove and recover …
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