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·The leaf sulfur contents in all vinasse rates and leaf potassium contents in the highest vinasse rate showed maximum accumulation at near 9 Mg ha 1 of phosphogypsum View Show abstract
·This work shows the possibility of obtaining potassium sulfate by converting phosphogypsum and potassium carbotane by the reaction CaSO 4 K 2 CO 3 → ↓ CaCO 3 K 2 SO 4 The optimal
Potassium sulfate is a chemical compound with the molecular formula K2SO4 It is soluble in water and has a molecular weight of g/mol Less direct methods of production include transformation reaction of other minerals such as phosphogypsum and K2CO3 Ennaciri et al 2013 gypsum and KCl Lozano and Wint 1982; Fernández Lozano
·In this present work the transformation of the Moroccan phosphogypsum PG waste considered a potential source of sulfate into potassium sulfate compound could help reduce environmental impact and create a new value chain for the phosphate industry Generally solid liquid equilibria are frequently applied in chemical industries
It is also possible to produce potassium sulfate by double decomposition of potassium chloride and phosphogypsum in aqueous ammonia solution at room temperature The reaction is proposed by Fernandez and al [9] CaSO4 2H2 O 2 KCl → K2 SO4 CaCl2 2H2 O
·Phosphogypsum PG is a large scale industrial by product generated during the production of phosphoric acid typically being deposited in landfills worldwide The leaching of fluoride F − phosphate PO 4 3− and sulfate SO 4 2− anions from PG into water bodies through rainfall results in significant environmental pollution Herein
·PA is produced by processing rock phosphate with sulfuric acid Silva et al 2010 The wet process generates several by products and phosphogypsum PG is the largest and the most interesting because it is rich in compounds with notable economic value such as sulfur rare earth elements REEs and fluoride Chernysh et al 2021; Tayibi et al 2009
·Biochars showed relatively higher potassium % and sulfur % contents than phosphogypsum potassium − % and sulfur − % In addition leachable fraction of
·The manufacturing of fertilizers ammonium sulphate potassium sulphate urea Phosphogypsum PG is a calcium sulphate dihydrate and a by product of the phosphate fertilizer industry It is
The production of potassium sulfate from phosphogypsum and potassium chloride in the presence of ammonia and isopropanol has been investigated The solubility of phosphogypsum in aqueous solutions
·Phosphogypsum PG waste causes several environmental problems The present work proposes an attractive process to recycle this industrial waste via the wet conversion and contributes to solve this problem In our previous work we tried to convert the PG by KOH at ambient temperature but its total conversion was limited at the concentration of M which
·In this present work the transformation of the Moroccan phosphogypsum PG waste considered a potential source of sulfate into potassium sulfate compound could help reduce environmental impact
·Calcium sulfate dihydrate CaSO 4 ·2H 2 O is the main content of phosphogypsum PG during the industrial wet process of manufacturing phosphoric acid PG also contains various soluble and insoluble impurities which present in the natural phosphate rock used in the H 3 PO 4 manufacturing process However some of these impurities could be
·Phosphogypsum PG is a byproduct of the wet phosphoric acid process with calcium sulfate as its primary component Approximately t of PG are generated per ton of phosphoric acid produced Li & Gu 2016 Globally the cumulative stockpiles of PG have reached 6 billion t with an annual increase of 200 million t Ou et al 2021 By the end of 2020 PG
·DOI / Corpus ID 272178206; From Grave to Cradle Treatment Resource Recycling and Valorization of Phosphogypsum Wastes article{Lou2024FromGT title={From Grave to Cradle Treatment Resource Recycling and Valorization of Phosphogypsum Wastes} author={Xiangyang Lou and Jiaxin Liang and Shan
Therefore the global reaction leading to the formation of potassium sulfate from phosphogypsum can be represented through the following equation 2NaOH 2KCl K2SO4 2NaCl Ca OH 2 2H2O In general all of these reaction processes are taking place at a constant temperature 25°C Below we outline the three steps process for
·Phosphogypsum PG emerges as by product during the wet preparation of phosphoric acid[1] potassium sulfate as well as some sulfur based products[13] Additionally PG has remarkable effects on promoting crop growth and increasing agricultural yields making it a valuable fertilizer or soil conditioner[14] Furthermore PG showcases the
·Solubility of calcium sulfate in concentrated aqueous chloride solutions is of particular significance in chloride hydrometallurgy and various crystallization processes such as the production of potassium sulfate from phosphogypsum and potassium chloride This paper examines an example of the second type of application in which gypsum and potassium
·Phosphogypsum PG waste is a by product generated from wet process phosphoric acid H3PO4 manufacturing during phosphate rock decomposition Worldwide the annual production of PG ranges between 100 and 300 million tons with only a few quantities utilized in several application domains about 15% the unused PG is usually discharged into
·The main composition of PG is calcium sulfate dihydrate DH but it contains SO 4 6 ·H 2 O [19] when using pure salt solution containing sodium or potassium The superiority of glycerol as reaction medium does not introduce impurity ions and without corrosive nature but the ability to transform DH into α HH is much lower than that of
·Phosphogypsum PG commonly known as calcium sulfate is a waste by product generated during the production of phosphoric acid by the wet phosphoric acid process WPA It is well known that every year the phosphate industries produce a large quantity of PG around the world Currently global production of this waste is estimated at 300 Mt/ year
·Abstract—The possibility of obtaining potassium sulfate by converting calcium sulfate phosphogypsum and potassium chloride in an ammonia solution was investigated The optimal conditions for the process at various concentrations of
·The way of comprehensive utilization of phosphogypsum was described and the mechanism of phosphogypsum producing cement preparing ammonium sulfate potassium sulfate and alkaline soil conditioner was analyzed
·The impurities in phosphogypsum and its harm to the environment were introduced and the advantages and disadvantages of the widely used pretreatment methods were analyzed in this paper The application of phosphogypsum in the fields of cement retarder building materials agriculture the production of sulfuric acid co production cement soil
