THE STUDY OF NEUTRALIZATION OF THE DIHYDRATE …
tal production neutralized phosphogypsum was dried in the drum-type 5 t/h efficiency dryer SB-1.6-81 and boiled in 4.5 m3 capacity gypsum boiler or in 63 l capa-city autoclave. RESULTS AND DISCUSSION Impurities of phosphogypsum Most impurities in phosphogypsum consists from a phosphate impurities remaining when orthophosphoric acid is washed out.
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ANHYDRITE BINDER CALCINED FROM PHOSPHOGYPSUM
The phosphogypsum – dihydrate calcium sulphate is waste material of phosphoric acid production from the Kola apatites. The possibility of applying lime neutralized phosphogypsum as a raw …
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Effects of impurities in phosphogypsum and pre …
Neutral and alkaline environment is conductive to the formation and growth of α hemihydrates when using lime to neutralized phosphogypsum. Discover the world's research. 20+ million members;
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Investigation of Phosphogypsum-Based Cementitious …
The possibility of applying lime neutralized phosphogypsum as a raw material for obtaining anhydrite binder was investigated in this paper. The effect of the calcination temperature and of ...
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Efficiency of the use of neutralized phosphogypsum, …
DOI: 10.1002/tqem.21707 Corpus ID: 225159492; Efficiency of the use of neutralized phosphogypsum, phosphorite processing waste, in agriculture @article{Efremova2020EfficiencyOT, title={Efficiency of the use of neutralized phosphogypsum, phosphorite processing waste, in agriculture}, author={Saniya Y. Efremova and Natal'y …
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Properties, Purification, and Applications of Phosphogypsum…
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 phosphoric acid production, where worldwide PG generation exceeds 300 million tons annually. The vast majority of produced PG is discarded irresponsibly, leading to …
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Phosphogypsum waste lime as a promising substitute of …
The study aims to compare a special lime putty prepared from phosphogypsum with a commercial lime powder and an aged lime putty. The results obtained in terms of chemical composition, ... (SO 4) 3, the acidity of PG can be neutralized and …
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Application of lime neutralised phosphogypsum in …
The inevitably incorporation of P 2 O 5 impurity results in the poor quality of phosphogypsum (PG), which further hinders the utilisation of PG in manufacturing the supersulfated cement (SSC), an environment-friendly and energy-saving cement made almost entirely from industrial waste. Lime neutralisation provides a sustainable approach to remove …
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Application of Lime Neutralised Phosphogypsum in …
Liu et al. (2020) observed that a minimum of 2% of Ca (OH) 2 is sufficient for removing phosphate impurity and improving the pH value of PG. Additionally, for SSC …
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Agroecological efficiency of periodic use of neutralized phosphogypsum
Phosphogypsum (PG) is a by-product of the phosphate fertilizer industry. In Brazil, three main phosphate industries are responsible for the production of 5.5 × 106 metric tons of PG per year ...
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Journal Ceramics-Silikáty
The paper presents the characterization of dihydrate phosphogypsum impurities, both in laboratory and in industrial scale, and chemical process of their neutralization in the lime …
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Long‐Term Effects of Lime and Phosphogypsum on Soil
The main plot was subject to three lime treatments: (i) control (no lime); (ii) incorporated lime (IL):incorporation of 4.5 Mg lime ha À1 to a depth of 0–20 cm by; and (iii) surface lime (SL ...
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Investigation of anhydrite cement produced from phosphogypsum
Phosphogypsum, neutralized with lime, with addition of 5% of clay and 5% of ground glass was burned at 900 C. This method was assuring the production of anhydrite cement of high quality with ...
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Neutralization of Phosphogypsum for Use in Base …
phosphogypsum neutralized with 3% lime Property3 Value Compaction characteristics (i) Optimum moisture content (%) (ii) Maximum dry unit weight(g/cc) 23.6 1.33 Permeability(m/s) 1.49x10-6 As the phosphogypsum neutralized with 3% lime does not satisfy the permeability requirement specified by CPCB (k ≤ 10-6 m/s), it
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Neutralization of Phosphogypsum for Use in Base Lining …
lime, fly ash, and pond ash and to assess the suitability of neutralized phosphogypsum for use in the upper part of the composite liner system of phosphogypsum ponds. The study indicated …
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Study on the Mechanical Properties of Cast-In-Situ Phosphogypsum …
The acidity of phosphogypsum is neutralized by hydrated lime, the anhydrite is consumed by cement, the water reducer is used to reduce the water consumption, and the retarder is used to delay the setting time after being cast-in-situ. Open in a …
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Enhancement of phosphogypsum's water stability in
Similarly, the increase in pH during the dry-wet cycling process indicated that free phosphate in PG was neutralized (Fig. 10). ... Application of lime neutralised phosphogypsum in supersulfated cement. J. Clean. Prod., 272 (2020), Article 122660, 10.1016/j.jclepro.2020.122660.
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Treatment of phosphogypsum and mechanical …
study aims to determine the percentages of materials (crushed sand, tuf, cement, lime) that neutralized phosphogypsum and to specify the blocks having the best properties in terms of ultrasonic velocity and compressive strength. The obtained results showed that the treatment of phosphogypsum by cement or lime and
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INFLUENCE OF PHOSPHATIC IMPURITIES ON THE …
A possibility to use an unwashed, lime neutralized waste phosphogypsum - dihydrate calcium sulphate was analyzed in order to obtain an anhydrite binding material. Influence of calcination …
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Role of polyacrylamide in the removal of soluble phosphorus …
Phosphogypsum, an industrial solid waste produced in wet phosphoric acid production, is difficult to be utilized due to the harmful impurities such as phosphorus and fluorine. In this study, lime neutralization process was introduced to remove soluble phosphorus and soluble fluorine from phosphogypsum in presence of polyacrylamide. The effects of …
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Neutralization of Phosphogypsum for Use in Base Lining …
Hence, the present work is intended to neutralize phosphogypsum with lime, fly ash, and pond ash and to assess the suitability of neutralized phosphogypsum for use in the …
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anhydrite binder calcined
The possibility of applying lime neutralized phosphogypsum as a raw material for obtaining anhydrite binder was investigated in this paper. The effect of the calcination. Consulta · Phosphogypsum (PG), as a bulk industrial solid waste with high and complicated impurities content, makes it difficult to be utilized. In this paper, raw PG by ...
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Application of lime neutralised phosphogypsum in …
The possibility of applying lime neutralized phosphogypsum as a raw material for… The effect of phosphogypsum (PG) modified on mechanical properties of super sulphate …
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Neutralization of Phosphogypsum for Use in Base Lining …
Hence, the present work is intended to neutralize phosphogypsum with lime, fly ash, and pond ash and to assess the suitability of neutralized phosphogypsum for use in the upper part of the composite liner system of phosphogypsum ponds. The study indicated effective neutralization of phosphogypsum with 1.6% lime and 50% fly ash.
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Investigation on Engineering Characteristics of Lime …
In this study, phosphogypsum was stabilized by lime to improve the mechanical properties [California bearing ratio (CBR), resilience modulus, unconfined compressive strength, and shear strength], water stability, and harmful substances dissolubility. Combined with scanning electron microscopy, the strength formation and water stability ...
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Effect of modified phosphogypsum on the dimensional …
Research findings demonstrated that high-temperature calcination at 200°C and 800°C effectively decreased impurity levels in PG, and lime neutralization was employed to immobilize soluble …
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Treatment of phosphogypsum and mechanical …
study aims to determine the percentages of materials (crushed sand, tuf, cement, lime) that neutralized phosphogypsum and to specify the blocks having the best properties in terms of …
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Experimental study on the mechanical properties of modified
According to existing literature 26,27,28,29, the hemihydrate phosphogypsum was neutralized using quicklime, and the specimens were mixed and poured using hemihydrate phosphogypsum, quicklime ...
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Effects of impurities in phosphogypsum and pre-treatment …
Experimental results showed that α hemihydrates prepared from phosphogypsum cannot be applied to actual production due to negative impacts on mechanical strength and setting time ;the α hemihydrates prepared from lime neutralized phosphogypsum has better strength;the effect of H3PO4,which is dissolve phosphorus impurity, on performance of α ...
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ANHYDRITE BINDER CALCINED FROM PHOSPHOGYPSUM
(SC) Lifosa. Dihydrate phosphogypsum was neutralized in lime suspension (water/lime ratio - 0.004) according to methodology [8, 9] to pulp pH 11.0-11.5 of phos-phogypsum with ratio of water and gypsum (W/G = 1). The neutralized phosphogypsum has been filtrated and dried at the temperature 100 ± 2°C. The pure CaO was used for the neutralization of
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