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  • Application of lime neutralised phosphogypsum

    01.11.2020· 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 the impurity in the PG and

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  • THE STUDY OF NEUTRALIZATION OF THE DIHYDRATE

    Alkalies accumulation For the phosphogypsum neutralization technology to be wasteless, the filtrate after the neutralized phosph- ogypsum pulp filtration (pH= 7) was used again and again for the preparation of lime cream. It has been noticed that the alkalies are accumulated in an often used filtrate (in phosphogypsum up to 0.4 %).

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  • Study on lime–fly ash–phosphogypsum binder -

    01.07.2007· The chemical compositions of phosphogypsum, fly-ash, quick lime, slaked lime and modified lime were given in Table 1, those materials were used as raw materials for making lime–fly ash–phsphogypsum binder.The modified lime (stabilizer) was manufactured by blending quick lime with 10% of additives and grinding together in a ∅ 500 × 500 mm 3 testing ball mill till the 0.075 mm screen

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  • Engineering Properties of Bentonite Stabilized

    06.02.2015· The content of the lime and phosphogypsum varied from 0 to 10 %. The results reveal that the dry unit weight and optimum moisture content of bentonite + 8 % lime increased with the addition of 8 % phosphogypsum. The percentage of swell increased and the free swell index decreased with the addition of 8 % phosphogypsum to the bentonite + 8 % lime mix. The unconfined compressive

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  • The problems of phosphogypsum utilization in Lithuania

    phosphogypsum but not its washing with water. The essence of the technology is as follows:. 0 phosphogypsum dehydrate in which there is no more than 1.3% of general P205 and 0.9% P205 which is water soluble is neutralized with lime cream and the pulp is filtered; l filtrate is once again used for lime cream preparation; l filtered phosphogypsum

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  • Phosphogypsum waste as additives to lime stabilization of

    Phosphogypsum waste as additives to lime stabilization of bentonite Safae Oumnih1,2, Nadia Bekkouch1,3, El Khadir Gharibi2, Nathalie Fagel1, Kamal Elhamouti3 and Meriam El Ouahabi1* Abstract Waste recycling with increasing the lifecycle of resource is a novel approach for enhancing circular economy. Within this context, this study aims to give a second life cycle to phosphogypsum (PG)

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  • THE NEUTRALIZED PHOSPHOGYPSUM AS

    Phosphogypsum is not only a valuable meliorant for saline soils, it is also a multicomponent fertilizer that improves the soil structure and physical properties. Long-term research allowed to prove agronomical and economical efficiency of phosphogypsum application, to develop regulations for its application in agriculture. As the greatest result of all research work phosphogipsum was included

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  • Customs bureau bans entry of 'phosphogypsum'

    Guerrero said that the prohibition of the importation of neutralized phosphogypsum is in line with the Department of Environment and Natural Resources Administrative Order No. 22 Series of 2013 (Revised Procedures and Standards for the Management of Hazardous Wastes. In a letter addressed to the BOC, Director Metodio U. Turbella of the Environmental Management Bureau said that neutralized

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  • Plasticity, Swell-Shrink, and Microstructure of

    The study involved utilization of an industrial waste, Phosphogypsum (PG), as an additive to lime stabilization of an expansive soil. Three lime dosages, namely, initial consumption of lime (ICL), optimum lime content (OLC), and less than ICL (LICL), were identified for the soil under study for stabilizing the soil. Along with lime, varying doses of PG were added to the soil for stabilization. The effect of

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  • neutralized with lime - Deutsch-Übersetzung – Linguee

    Viele übersetzte Beispielsätze mit "neutralized with lime" – Deutsch-Englisch Wörterbuch und Suchmaschine für Millionen von Deutsch-Übersetzungen.

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  • Effect of phosphogypsum on strength of lime stabilized

    Effect of phosphogypsum on strength of lime stabilized expansive soil The use of phosphogypsum as an additive to lime, to enhance its performance in soil stabilization, is analyzed in this paper. Phosphogypsum is a by-product of the phosphate rock processing during production of

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  • Long‐Term Effects of Lime and Phosphogypsum

    Lime and phosphogypsum applications are well‐established practices in weathered soils, and their surface application under no‐till (NT) can affect soil physical attributes and carbon (C) and nitrogen (N) fractions. This study determined the long‐term (10‐yr) effects of lime and phosphogypsum applications to the soil surface on soil C and N fractions of a tropical NT field. The experimental design was a

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  • Investigation of anhydrite cement produced from

    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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  • Modification of Lime-Fly Ash-Crushed Stone with

    The results indicate that lime-fly ash-crushed stone modified with phosphogypsum has the required strength of the road base material and favourable performances in environment (wetting-drying cycle) stability. The image processing analysis and shrinkage tests demonstrated that phosphogypsum can significantly improve the compactness and shrinkage performance of lime-fly ash-crushed stone

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  • Efficiency of the use of neutralized

    Phosphogypsum (PG), phosphorite processing waste, can be used in agriculture as a chemical ameliorant to eliminate soil degradation. But it has some disadvantages, especially acidity; therefore, the use of neutralized phosphogypsum (NPG) is proposed. The development of methods for the rational NPG use, both separately and in combination with mineral fertilizers, to improve soil fertility was

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  • Re: Lime-treated Gypsum - Page 3 of 7

    Re: Lime-treated Gypsum. Hello Norew, Your used gypsum is mineral gypsum or chemical gypsum or industrial byproduct phosphogypsum.Chemical gypsum contain impurities like free phosphoric acid,phosphates, flourides and organic matter.Lime treatment is used to neutralize the impurities to some extent to get rid of its negative effects on cement hydration and setting time.Mineral gypsum is free

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  • Journal Ceramics-Silikáty

    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 material for obtaining anhydrite binder was investigated in this paper. The effect of the calcination temperature and of following additives: dust from a cupola furnace, ground glass and clay on the

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  • Effect of modified phosphogypsum on the

    30.07.2019· Zhou Lina compared some modification methods of PG on hydration of cement and pointed out that the setting time of washed PG in cement was longer than that of original gypsum in cement and the effect of PG after neutralized with lime and gypsum are the same; while modified PG with lime and fly ash could solidify the soluble phosphorus and soluble fluorine . Taher investigated modified PG after

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  • THE NEUTRALIZED PHOSPHOGYPSUM AS

    Phosphogypsum is not only a valuable meliorant for saline soils, it is also a multicomponent fertilizer that improves the soil structure and physical properties. Long-term research allowed to prove agronomical and economical efficiency of phosphogypsum application, to develop regulations for its application in agriculture. As the greatest result of all research work phosphogipsum was included

    Read More +
  • Assessment of Phosphogypsum as a Constituent of Aggregate

    posed of phosphogypsum, lime, and fly ash, which would be suitable for road construction. Such high-volume use of 3 phospho gypsum would reduce the storage problems associated with it. Its uses with asphalt, cement, cement-kiln dust, silica, clays, and oxychlorides were also investigated.

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Lime neutralized phosphogypsum

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