Results 181 to 190 of about 7,633 (210)

Free water in phosphogypsum

Fertilizer Research, 1990
Phosphogypsum, which is a by-product in the manufacture of phosphoric acid from phosphate rock, exhibits a partial loss of water of hydration at temperatures above 60°C as the calcium sulfate converts from the dihydrate to the hemihydrate and ultimately to the anhydrate.
D. W. Averitt, J. E. Gliksman
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Tunisian Phosphogypsum Challenges

2020
The Geotechnical Engineering Journal of the SEAGS & AGSSEA, 51, 4, pp 185 ...
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Valorization of phosphogypsum as hydraulic binder

Journal of Hazardous Materials, 2008
Phosphogypsum (calcium sulfate) is a naturally occurring part of the process of creating phosphoric acid (H(3)PO(4)), an essential component of many modern fertilizers. For every tonne of phosphoric acid made, from the reaction of phosphate rock with acid, commonly sulfuric acid, about 3t of phosphogypsum are created.
T, Kuryatnyk, C, Angulski da Luz, J, Ambroise, J, Pera   +3 more
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Potential utilization of phosphogypsum

Mining, Metallurgy & Exploration, 1993
The waste phosphogypsum produced by Paradeep Phosphate Limited (PPL) at Paradeep (Cuttack, Orissa, India) consists primarily of calcium sulfate with small amounts of phosphoric acid, calcium fluoride and other harmful components. Presently these are dumped as waste.
B. Mohanty, D. Panda, A. S. Rao, P. K. Sahoo   +3 more
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Radiochemistry of Florida phosphogypsum

Journal of Environmental Radioactivity, 1996
Abstract Phosphogypsum is the by-product of producing phosphoric acid by reacting phosphate rock with sulfuric acid. The phosphoric acid industry in Florida is the largest in the world and it is estimated that 1 × 10 9 tonnes of phosphogypsum will soon be stored in 18 subaerial sites, the so-called Florida “gyp-stacks”.
C.D. Hull, W.C. Burnett
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PHOSPHOGYPSUM USES IN AGRICULTURE

1994
Phosphogypsum (CaS04), a by -product of phosphoric acid production from rock phosphate is a potential source of calcium and sulfur for plants, as well as an ameliorant for alkaline and sodic soils. Phosphogypsum production worldwide exceeds 150 million Mg annually, with only about 4 percent being used in agriculture and industry and the rest being ...
Rechcigl, J.E., Alcordo, I.S., Rechcigl, J.E., Alcordo, I.S.   +3 more
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An effective treatment method for phosphogypsum

Environmental Science and Pollution Research, 2019
Phosphogypsum (PG) accumulation occupies huge amounts of land resources and results in serious environmental risks. A new recycling product, the phosphogypsum embedded filler (PGEF) made with calcination-modified phosphogypsum, was developed. The preparation process, hydration mechanism of PG, basic physical performances, environmental safety ...
Dong-Sheng, Liu, Chao-Qiang, Wang, Xu-Dong, Mei, Chun, Zhang   +3 more
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Flotation purification of waste high-silica phosphogypsum

Journal of Environmental Management, 2022
High-silica phosphogypsum (PG) is a kind of industrial by-product with great utilization potential. However, it is difficult to reuse PG directly due to the related gangue minerals (e.g., SiO2), and thus efficient purification is required to allow its further applications. Herein, a typical high-silica phosphogypsum waste was purified by a new "reverse-
Ji Fang, Yingyong Ge, Zhijie Chen, Baolin Xing, Shenxu Bao, Qing Yong, Ruan Chi, Siyuan Yang, Bing-Jie Ni   +8 more
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Phosphogypsum Pelletization Tests

1993
The main raw material for the production of artificial fertilizers Is phosphoric acid. It Is obtained from a polycomponent phospate ore. A by-product is phosphogypsum which contains harmful and dangerous components. Therefore it cannot be used as a secondary raw material. Also, If dumped into waterways, lakes or the sea or if deposited in special areas,
Gazarek, Mato, Premur, Vitomir
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Dissolution characteristics of 226Ra from phosphogypsum

Journal of Environmental Radioactivity, 2002
The paper presents the results of the dissolution characteristics of 226Ra from phosphogypsum, a by-product from phosphate fertilizer industries. Leachability of 226Ra in distilled water and rainwater have been examined under different leaching conditions such as contact time, solid:liquid ratio and simulating natural conditions.
P P, Haridasan, C G, Maniyan, P M B, Pillai, A H, Khan   +3 more
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