·Using phosphogypsum PG as the aggregate of cemented backfill is an economical and effective method of PG utilization However the stability and performance of cemented backfill are challenged by the rich fluoride content in PG In this study the effects of citric acid pretreatment on PG defluorination backfill performance and environmental behavior
·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
·Impurities present in phosphogypsum PG limited its use as an aggregate in underground mining construction materials This study pretreated PG with varying Ca OH 2 contents and investigated the effect of pretreated PG on the strength development of cemented PG backfill from the perspective of hydration characteristics and structural features The results
·Phosphogypsum pretreatment with CaCO<inf>3</inf> to improve the backfill performance 2023 Case Studies in Construction Materials Citation Excerpt The Ca2 and OH produced by ionization of Ca OH 2 can effectively adjust the pH of PG and immobilize the soluble phosphate fluoride and other impurities [42] However it should be noted that
·In situ remediation of phosphogypsum in a cement free pathway Utilization of ground granulated blast furnace slag and NaOH pretreatment
·The method is cheap and practical and can be used as an important method for pretreatment of phosphogypsum View Show abstract Application of Lime Neutralised Phosphogypsum in Supersulfated Cement
·Phosphogypsum PG industrial solid waste is generated from phosphoric acid production [1] [2] In China approximately 75 Mts of PG were discharged in 2019 and the stockpile is estimated to exceed 400 Mts [3] Simultaneously the worldwide PG generation was up to 280 Mts every year with a stockpile of more than 6000 Mts [4] The main component of PG
·Six pretreatment processes in total were conducted on phosphogypsum using autoclaving and calcination Three parameters of the CBPG mortars were comparatively studied to evaluate their water resistance the ratio of the compressive strength in the wet saturated state to that in the dry state W/D ; weight loss after static water attack WLSW ; and weight loss after
·The above pretreatment eliminates impurities that hinder hydration in different ways Nevertheless the methods of penetrating PG have different highlights and challenges but all methods are intended to remove the impurities efficiently Although the mechanical property is optimized water washing is more efficaciously in removing water
·The massive accumulation of phosphogypsum will not only bring economic burden to the enterprise but also pollute the environment The types of impurities in phosphogypsum and their pretreatment methods were expounded phosphorus and fluorine impurities can be removed by water washing acid base neutralization sieving calcination
·Although lime neutralization is widely recommended for raw phosphogypsum pretreatment the influence mechanism of alkaline environment on hydration of hemihydrate phosphogypsum HPG is not clear
·This paper studied effect of different pretreatment process on Yunnan phosphorus building gypsum strength and crystal morphology such as washing method lime neutralization method flotation method and Hans method A lots experiment result indicated that basic properties of phosphorus building gypsum of different pretreatment methods could satisfy
·The stacking of phosphogypsum has caused considerable phosphorus pollution in water bodies near phosphogypsum yards through surface runoff and underground infiltration The phosphate oxygen isotope δ 18 O p tracing method has served as a valuable tool for tracing phosphorus pollution in the existing δ 18 O p enrichment and purification
DOI / Corpus ID 225020486; Research on the pretreatment and mechanical performance of undisturbed phosphogypsum article{Zhang2020ResearchOT title={Research on the pretreatment and mechanical performance of undisturbed phosphogypsum} author={Lin chun Zhang and Ai lian Zhang and Ke Li and Qian Wang and
·In this study the effects of citric acid pretreatment on PG defluorination backfill performance and environmental behavior were investigated by washing PG with different concentrations of citric
·The method is cheap and practical and can be used as an important method for pretreatment of phosphogypsum Discover the world s research 25 million members; 160 million publication pages;
·Phosphogypsum PG is a hazardous industrial solid waste product from the wet phosphate industry 1 widespread deposition of that fine light to dark grey powder with a slight odor and
·The calcination treatment for recycling phosphogypsum PG is very promising which can transform PG into a binder material and remove harmful impurities To effectively recycle and reutilize PG the influence of calcination temperatures on the properties of calcined and hydrated PG with and without pretreatment should be investigated
Phosphogypsum has poor cementitious activity which hinders its large consumption in the field of building materials By studying the phase and microstructure of phosphogypsum pretreated by alkali activation and the compressive strength and microstructure of the non sintering building materials prepared with the high content phosphogypsum the process parameters of preparing
ICS CCS Z05 T/CSPSTC XXX—2021 Technical specification for phosphogypsum pretreatment （） • 2021 XX XX 2021 XX XX
The economic and effective pretreatment is a key to its recycling into useful building materials The pretreatment such as washing neutralizing with quick lime grinding floating screening calcination etc have been studied The effectiveness problems and feasibility of pretreatment are analyzed This paper presents the pretreatment principle of phosphogypsum utilization
·In this study five different pretreatment methods were proposed for comparative analysis to examine the pretreatment effect on the mechanical and environmental behaviors of ternary phosphogypsum
·In landfills for phosphogypsum disposal a large volume of leachate wastewater generated by the residual process water and by the rainfall percolation through the solid material must be managed The leachate shall be properly treated before its discharge to surface water or its reuse; it has a very low pH and high concentrations of hazardous contaminants such as
