Reuse of Phosphogypsum Pretreated with Water Washing as …
Phosphogypsum (PG) is reused as aggregate in the cemented backfill of the mines, which effectively improves the PG reutilization efficiency. ... Liu YK, Zhang QL, Chen QS, Qi CC, Su Z, Huang ZD (2019) Utilisation of Water-Washing Pre-Treated Phosphogypsum for Cemented Paste Backfill. Minerals 9; Mao YP, Wu H, Wang WL, Jia MH, Che XC (2020 ...
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Reuse of phosphogypsum pretreated with water washing as …
Reuse of phosphogypsum pretreated with water washing as aggregate for cemented backll Yanan Zhou1, ... washing PG were determined at a stirring time of 5 min and a solid–liquid ratio of 1:0.5 ...
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[PDF] Utilisation of Water-Washing Pre-Treated Phosphogypsum …
Recycling phosphogypsum (PG) for cemented paste backfill (CPB) has been widely used at phosphate mines in China. However, the impurities in PG prolong the setting time and reduce the uniaxial compressive strength (UCS), limiting the engineering application of PG. This paper aims to investigate the feasibility of treated PG (TPG) washed repeatedly using deionised water …
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Reuse of phosphogypsum pretreated with water washing as
Phosphogypsum (PG) is reused as aggregate in the cemented backfill, which effectively improves the PG reutilization efficiency. ... Based on the most economical principle of the water demand, the optimal conditions for washing PG were determined at a stirring time of 5 min and a solid-liquid ratio of 1:0.5. Then, the original and pretreated PG ...
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Staged purification of phosphogypsum using pH-dependent …
Phosphogypsum (PG) is an industrial by-product of the transformation of phosphate rocks. For decades, PG has been a source of environmental concern due to the massive amount produced thus far, i.e., 7 billion tons, with a current production rate of 200–280 million tons per year. Phosphate minerals contain various impurities that precipitate and …
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Reuse of phosphogypsum pretreated with water washing as …
Phosphogypsum (PG) is reused as aggregate in the cemented backfill, which effectively improves the PG reutilization efficiency. However, the massive impurities contained in aggregate PG would adversely affect the hydration of binder, and therefore deteriorate the strength development of backfill. This research starts with the feasibility study on pretreating PG with the water washing …
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Comparative analysis of colloid-mechanical microenvironments …
The storage of phosphogypsum could bring huge burden to the environment, while the traditional method of washing and purifying phosphogypsum produced a large amount of waste water and colossal energy consumption. The novel colloidal-mechanical method as a new treatment technology of purifying phosphogypsum was benefit for the large-scale ...
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Review of the State of Impurity Occurrences and Impurity …
Li et al. and Peng et al. treated phosphogypsum using single impurity removal technologies (screening, washing, lime neutralization, and acid leaching) and investigated the removal of …
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Alkaline-washed phosphogypsum-based cemented paste backfill …
Phosphogypsum (PG)-based cemented paste backfill (PCPB) is an effective way to deal with the problem of PG storage, but the low strength, high cost, and serious fluoride …
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Phosphogypsum washing and drying equipment | LZZG
Phosphogypsum washing and drying equipment. March.09,2020. This set of phosphogypsum washing and drying equipment adopts the sieving, washing, and grading process flow, that is, the phosphogypsum is first sieved to remove large particles larger than 25 mm, and then added to the grinding tank to grind into a slurry with water, and the slurry is removed by trimming and …
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Reuse of phosphogypsum pretreated with water washing as
Phosphogypsum (PG) is reused as aggregate in the cemented backfill, which effectively improves the PG reutilization efficiency. However, the massive impurities contained …
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Study on the Recycling of P in Phosphogypsum Leachate
to phosp·hogypsum companies that need 200 mL/h of water washing to process 100 g. Phosphogypsum (PG) is an inevitable solid waste produced from the wet process of phosphoric acid (Chen et al ...
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In Situ Remediation of Phosphogypsum with Water-Washing Pre …
The accumulation of original phosphogypsum (OPG) has occupied considerable land resources, which have induced significant environmental problems worldwide. The OPG-based cemented paste backfill (OCPB) has been introduced as a promising solution. In this study, a water-washing pre-treatment was used …
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Calcium Hydroxide Washing Treatment of Jordanian …
Phosphogypsum samples were obtained from the Jordan Phosphate Mines Company in Amman-Jordan. Experimental investigations were carried out to study the removal or reduction of P 2 O 5 from phosphogypsum by washing with calcium hydroxide solutions. Ten samples of fresh phosphogypsum (100 g) were taken for the analysis. The
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(PDF) Phosphogypsum Recycling: A Review of Environmental …
Five clusters were formed: a red cluster-phosphogypsum recycling in the construction industry; green cluster-radiation pollution problem of phosphogypsum and phosphate fertilizers; yellow cluster ...
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Phosphogypsum washing and drying equipment | LZZG
This set of phosphogypsum washing and drying equipment adopts the sieving, washing, and grading process flow, that is, the phosphogypsum is first sieved to remove large particles …
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Preparation of gypsum with high purity and whiteness from phosphogypsum
Phosphogypsum (PG) is a hazardous industrial solid waste product from the wet phosphate industry 1,2.The widespread deposition of that fine, light- to dark-grey, powder with a slight odor and ...
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Effect of Phosphogypsum on the Properties of Portland Cement
In general, the processing of phosphogypsum by washing and drying gave better performance in all medium. Further detail investigation on the properties of phosphogypsum and reaction mechanism could provide better understanding. Fig. 6. Compressive strength of concrete with Phosphogypsum addition at (a) 7 days and (b) 28 days 0% 2% 5% 10% 15% ...
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Environmental filling materials based on phosphogypsum powder …
Experimental procedures are mainly followed three steps: MSWI fly ash washing treatment, Mixing design and production process. The detailed procedures of these three steps are listed as below.
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Comparative study of fresh phosphogypsum treatment by sulfuric …
1 INTRODUCTION. Phosphogypsum (PG) is the solid waste of DAP fertilizer plants, a byproduct of H 3 PO 4 acid production. A total of 4.5−5.5 tons of PG per ton of H 3 PO 4 is discharged in the H 3 PO 4 production process. 1-5 The gypsum content varies according to the apatite source and H 3 PO 4 production technology. The global cumulative PG has exceeded …
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Phosphogypsum circular economy considerations: A critical …
Nearly 300 million t of phosphogypsum (PG) are produced every year as a byproduct from phosphate fertilizer production worldwide. Approximately 58% of the PG are stacked, 28% are discharged in coastal waters and only 14% are further processed. This critical review provides an overview of the physical-chemical properties of PG produced from ...
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A review on the environmental impact of phosphogypsum and …
Metal (loid)s are commonly not released during sieving, crushing, and washing with water of near neutral pH (Cánovas et al., 2018). Contrary to the treatment with water processing of PG with sulfuric acid at temperatures of 70–100 °C can result in a relative metal (loid)-free PG which can be then used as a supplement for construction ...
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(PDF) Phosphogypsum Processing Method
The comparison of the developed phosphogypsum processing method with well-known national and foreign analogues showed that its cost-efficiency is 2-3 times higher; the area necessary for the plant ...
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Calcium Hydroxide Washing Treatment of Jordanian Phosphogypsum …
Phosphogypsum samples were obtained from the Jordan Phosphate Mines Company in Amman-Jordan. Experimental investigations were carried out to study the removal or reduction of P 2 O 5 from phosphogypsum by washing with calcium hydroxide solutions. Ten samples of fresh phosphogypsum (100 g) were taken for the analysis.
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Utilisation of Water-Washing Pre-Treated …
Recycling phosphogypsum (PG) for cemented paste backfill (CPB) has been widely used at phosphate mines in China. However, the impurities in PG prolong the setting time and reduce the uniaxial compressive strength …
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Recycling phosphogypsum in road construction materials and …
Environmental protection; Phosphogypsum; Recycling; Pretreatment; Highway engineering. 1. Introduction. Phosphoric acid (PA) is a common inorganic acid used in agriculture, food, pharmaceuticals, chemicals, etc. Phosphoric acid is a main raw material for producing agricultural phosphate fertilisers and a major food additive, and it is also used in manufacturing …
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Method of washing waste phosphogypsum
the amount of water for washing phosphogypsum introduced onto the filter is equivalent to the amount of water taken from the system in the form of a solution of phosphoric acid, the concentration of this acid ranging from 27 up to 40 percent of P 2 O 5, in the form of crystal water combined with calcium sulfate as CaSO 4 .2H 2 O, in the form of water physically combined …
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A Novel Process to Recover Gypsum from …
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 …
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Review of the State of Impurity Occurrences and Impurity …
Among these techniques, the washing condition involves washing phosphogypsum with three times the amount of tap water 3–4 times until the washing liquid is neutral; the condition of lime neutralization involves adding lime to phosphogypsum with a water content of about 15%, mixing well, and then aging for 24 h.
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Experimental Study on Pretreatment of Preparing …
The principle of water washing method: the main impurity affecting the phosphogypsum can dissolve in water.The organic impurities mainly for oily substances above can float on water.Therefore, the water washing method can remove most of the phosphorus gypsum soluble
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