Ion uptake properties of low-cost inorganic sorption materials in the CaO–Al2O3–SiO2 system prepared from phosphogypsum and kaolin

Kadirova, Zukhra C.; Hojamberdiev, Mirabbos; Bo, Longli; Hojiyev, Rustam; Okada, Kiyoshi

doi:10.1016/j.jclepro.2014.06.084

Cited by 44 publications

(5 citation statements)

References 36 publications

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“…Therefore, the rate of phosphogypsum utilization is improved dramatically to solve the environmental pollution problem of phosphogypsum (El Zrelli R et al 2018; Z.C. Kadirova et al 2014;Yan Shen et al 2014). In the phosphorus-sulfur two-step process, there is a certain amount of insolubles solid material in the phosphoric acid acidolysis of PR, called phosphate rock acid-insoluble residue (PAIR).…”

Section: Introductionmentioning

confidence: 99%

Existing form and distribution of fluorine and phosphorus in phosphate rock acid-insoluble residue

Duan

et al. 2021

Environ Sci Pollut Res

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The phosphorus-sulfur two-step production process was developed in the wet-process phosphoric acid industry to solve phosphogypsum pollution. However, phosphate rock acid-insoluble residue is produced during this process as a new type of solid waste, which had a high potential for recycling. For process reasons, this type of residue still contains a certain amount of uorine and phosphorus, which has a massive impact on the potential uses of phosphate rock acid-insoluble residue. Therefore, X-ray photoelectron spectroscopy, Raman, electron probe spectroscopy and scanning electron microscopy were used to examine the existing form and distribution of uorine and phosphorus in phosphate rock acidinsoluble residue. The mass fraction of F and P 2 O 5 were 9.407% and 11.862%, respectively. Fluorine existed mainly in the form of uorite, uorapatite and metal uoride. Phosphorus existed mainly in the form of uoroapatite, phosphate, hydrogen phosphate and dihydrogen phosphate. The total phosphate, hydrogen phosphate and dihydrogen phosphate contents were much higher than that of uoroapatite, whereas the uoroapatite content was higher than that of uorite and metal uoride. Fluorine and phosphorus were distributed in the form of agglomerates in the phosphate rock acid-insoluble residue. Fluorine and phosphorus were partially correlated, showing a weak relationship in the high phosphorus area.

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Section: Introductionmentioning

confidence: 99%

Existing form and distribution of fluorine and phosphorus in phosphate rock acid-insoluble residue

Duan

et al. 2021

Environ Sci Pollut Res

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“…The kinetics parameters and correlation regression using the pseudo-second-order kinetics model for each ionic species at pH 7 are shown in , in accordance with the adsorbent prepared from phosphogypsum and kaolin , PO 4 3¹ and heavy metal ion, Ni 2+ . 35) It is noted that the removal rates of NH 4 + , PO 4 3¹ and Pb 2+ using the adsorbent is faster than other adsorbents. 3436) The removal amounts of PO 4 3¹ and Pb 2+ are higher than that of NH 4 + .…”

Section: ¹mentioning

confidence: 92%

Preparation of Mixed Metal Hydroxide Ash-Derived Adsorbent from Coal Fly Ash and Quicklime for Removal of Pb2+, NH4+, and PO43− from Aqueous Solution

Wajima

2022

Mater. Trans.

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Preparation of a novel adsorbent, mainly composed of Si(Al, Fe)Ca mixed hydrous oxides, from a mixture of coal fly ash and quicklime (CaO) was attempted. Coal fly ash was mixed with NaOH powder and heated to 600°C for 6 h in an electric furnace, and after cooling to room temperature, the produced fused coal ash was mixed with quicklime. The mixture was then stirred in distilled water at room temperature for one day to prepare the adsorbent. With increase in CaO addition to the fused fly ash, the adsorbent changed from an amorphous material to a mixture of calcite [CaCO 3 ] and amorphous phases, then a mixture of calcite and hydrocalumite [Ca 4 Al 2 O 8 (CO 3 )•11H 2 O], and finally that of calcite, hydrocalumite, and portlandite [Ca(OH) 2 ]. The removal ability of the adsorbent for NH 4 + is almost the same and that for Pb 2+ and PO 4 3¹ increases with increasing CaO addition. The removal of NH 4 + , PO 4 3¹ , and Pb 2+ depends on the pH of the solution. The adsorbent containing hydrocalumite without portlandite indicates good ability for multifunctional removal in neutral solution and fixation. Fly ash contents, Si and Al, in the adsorbent contribute to NH 4 + removal by ion exchange of SiAl amorphous gels, PO 4 3¹ removal by synthesis of hydrocalumite to form hydroxyapatite, and Pb 2+ removal by formation of PbSi 2 O 5 •1.6H 2 O. The kinetics of the removal of NH 4 + , PO 4 3¹ , and Pb 2+ using this adsorbent follows the pseudo-second-order kinetics model rather than the pseudo-first-order kinetics model, and the removal of Pb 2+ is faster than that of NH 4 + and PO 4 3¹ . These results indicate that a novel adsorbent with removal abilities for NH 4 + , Pb 2+ , and PO 4 3¹ can be prepared from coal fly ash and quicklime, and suggests a new recycling method for industrial wastes.

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“…Moreover, the concentration of most heavy metals in mixtures P1 to P6 is lower than that in OS. is may be attributed to the detention capacity of PG in the mixtures' microstructure; PG blocks the pores and limits the metal leaching process [29]. In addition, increasing the cement percentage in binders with a constant ratio of PG in the mix did not necessarily reduce heavy metal concentration leaching from the samples.…”

Section: Leaching Testsmentioning

confidence: 98%

Recycling of Oily Sludge as a Roadbed Material Utilizing Phosphogypsum‐Based Cementitious Materials

Xiao

Zhang

2019

Advances in Civil Engineering

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Oily sludge is a hazardous waste containing emulsified petroleum hydrocarbons, water, heavy metals, and solid particles. The objective of this work is to employ solidification/stabilization (S/S) techniques to utilize oily sludge as a roadbed material with ordinary Portland cement (OPC), fly ash (FA), and silica fume (SF) as binders and phosphogypsum (PG) as a stabilizer. The efficacy of the S/S process is assessed mainly through an unconfined compressive strength (UCS) test and a toxicity leaching test. Road performance, including water stability, freeze-thaw resistance, and volume stability, is also tested on the solidified samples. The mineralogical compositions, microstructures, and pore structure are characterized through X-ray diffractometry (XRD), scanning electron microscopy (SEM), and mercury intrusion porosimetry (MIP). The results show that the addition of 20% binders (OPC : FA : SF = 1 : 0.7 : 0.8) in combination with phosphogypsum to the oily sludge not only increases the 28-day compressive strength of the solidified samples and remarkably decreases the release of heavy metals but also refines the pore structure and compacts the microstructure. The solidified body had sufficient strength and good water stability performance, freeze-thaw resistance, and volumetric stability. This solidification/stabilization (S/S) process, which combines oily sludge treatment and phosphogypsum resource utilization, significantly enhances environmental protection and renders the solidified product economically profitable.

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Ion uptake properties of low-cost inorganic sorption materials in the CaO–Al2O3–SiO2 system prepared from phosphogypsum and kaolin

Cited by 44 publications

References 36 publications

Existing form and distribution of fluorine and phosphorus in phosphate rock acid-insoluble residue

Existing form and distribution of fluorine and phosphorus in phosphate rock acid-insoluble residue

Preparation of Mixed Metal Hydroxide Ash-Derived Adsorbent from Coal Fly Ash and Quicklime for Removal of Pb<sup>2+</sup>, NH<sub>4</sub><sup>+</sup>, and PO<sub>4</sub><sup>3−</sup> from Aqueous Solution

Recycling of Oily Sludge as a Roadbed Material Utilizing Phosphogypsum‐Based Cementitious Materials

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