X-Ray diffraction pattern of the neutralized phosphogypsum …

This study investigates the possibility to neutralize phosphogypsum using zeolite ground in ball mill and to use the neutralized phosphogypsum for production of gypsum binding materials. View Get ...

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Effect of modified phosphogypsum on the hydration properties …

Some modification methods to PG have been taken, such as burnt with high temperature and neutralized with lime, ... Basic properties of non sintering cement using phosphogypsum and waste lime as activator. Constr. Build. Mater., 21 (6) (2007), pp. 1342-1350, 10.1016/j.conbuildmat.2005.12.022. View PDF View article View in Scopus Google Scholar

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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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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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Effects Comparison of Different Pretreatment Methods to Phosphogypsum …

Through comparing the most representative three pretreatment methods of phosphogypsum,including irrigation,neutralized by lime and calcination.All the phosphogypsum pretreated via these three methods can meet the intended requirements of construction materials.Neutralized by lime is the most economical and applicable way.

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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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[PDF] THE STUDY OF NEUTRALIZATION OF THE DIHYDRATE PHOSPHOGYPSUM …

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 suspension. The fastest and controlling processes of transfer water soluble impurities to insoluble compounds of calcium orthophosphates {Ca 3 (PO 4 ) 2 ·nH 2 O and Ca 5 (PO 4 ) 3 OH·mH 2 …

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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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A Novel Process to Recover Gypsum from Phosphogypsum

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 contains calcium sulfate dehydrate as the main mineral, with small amounts of brushite, quartz, muscovite, and zoisite. Harmful elements, such as silicon, …

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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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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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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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Influence of phosphogypsum purification with lime on the …

Semantic Scholar extracted view of "Influence of phosphogypsum purification with lime on the properties of cementitious matrices with and without plasticizer" by J. A. Neto et al. ... the acidic impurities in hemihydrate phosphogypsum (HPG) must be neutralized when HPG is utilized, and a little amount of calcium hydroxide (CH) is the best ...

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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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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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Role of polyacrylamide in the removal of soluble …

The treated phosphogypsum, the 0.02% soluble phosphorus and 0.03% soluble uorine met the requirements of gypsum building materials. Keywords Phosphogypsum · Lime neutralization method · Polyacrylamide · Response surface method · Phosphorus · Fluorine Introduction Phosphogypsum (PG), primarily made up of CaSO 4 ·2H 2 O,

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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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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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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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ANHYDRITE BINDER CALCINED FROM …

(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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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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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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Characteristic properties of the anhydrite binder produced …

It is possible to conclude that during the calcination of the phosphogypsum neutralized by lime to pH of 11.0-11.5 the calcium oxide [15], which presents in the system, as well as the alkaline ...

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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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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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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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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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The study of neutralization of the dihydrate 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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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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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 temperature on the properties of the obtained material was analyzed. It was determined that phosphoanhydrite calcined at 800°C temperature is characterized ...

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