The main impurity in phosphogypsum is phosphorus In this experiment H 2 C 2 O 4 with various concentrations was used for pretreatment which reacts with phosphorus impurities to produce calcium oxalate precipitation CaC 2 O 4 of relatively stable and water soluble phosphorus H 3 PO 4 The chemical mechanism is as follows
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Get PriceThe 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
Get Pricethe 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 etc and organic impurities are removed by washing flotation calcination aging etc sodium and potassium alkali metal salt impurities can …
Get Priceby 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 high content and high compressive strength non burning building materials with …
Get PriceOn 28 Nov 2024 the Bureau of Ecology and Environment of Chifeng City Inner Mongolia Autonomous Region showed that Inner Mongolia Dadi Yuntian Chemical Co Ltd Dadi Yuntian planned to carry out a phosphogypsum pre treatment project
Get PricePhosphogypsum was first dried sieved and mixed proportionally with lignite at the mass Get Price; The Necessity of Phosphogypsum Pretreatment Henan The Necessity of Phosphogypsum PretreatmentIn order to achieve high efficiency and energy saving solid waste utilization the pretreatment scheme must be low cost large scale and harmless
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Get PriceThe results revealed that pretreatment of coir fibers with boiling and washing enhanced the bending modulus of rupture MOR and internal bond IB The required fibers pretreatment was found to be boiling and washing as this procedure improved some of the physical and mechanical properties of the natural fibers employed
Get PricePartial Replacement of Fine Aggregate and Cement in Concrete Pavement by Phosphogypsum Brijesh Kumar Gour Mukesh Choudhary Bharat Nagar 220 Analysis of Low Noise Amplifier using 45nm CMOS Technology Overview of Pretreatment Process in Powder Coating Priyanka Tupe Meeta Thorat Lashman K 302
Get PriceIn situ remediating phosphogypsum PG for cemented paste backfill CPB in the contaminated site is economic management for promoting sustainable developments in the phosphate industry This study concerns the combined use of NaOH pretreatment and ground granulated blast furnace slag GGBFS additi …
Get PricePretreatment is the removal reduction or alteration of pollutants in industrial wastewater prior to discharge or introduction into a domestic wastewater treatment facility WWF Metal finishing and related operations are a common source of industrial wastewater in Florida that typically requires treatment prior to discharge to a WWF
Get PriceA novel and sustainable approach for biotransformation of phosphogypsum to calcium carbonate using urease producing Lysinibacillus sphaericus strain GUMP2 Prajakta Pratap Patil Meghanath Comparison of different pretreatment methods on phosphorus release and recovery as struvite from excess sludge Dexiu Hu Cong Zhang & Yan Zhang
Get PriceModified phosphogypsum MPG was developed to improve dewaterability of sewage sludge and dewatering performance properties of treated sludge composition and morphology distribution of EPS dynamic analysis and multiple regression model on bound water release were investigated
Get Pricein order to study the effect of different pretreatment processes on the properties of phosphogypsum the chemical composition micro morphology and crystal form of phosphogypsum were characterized by x ray diffraction x ray fluorescence scanning electron microscope and thermogravimetric analysis the index of mechanical properties working …
Get PriceAs a by product from the phosphate fertilizer industry phosphogypsum PG mainly contains gypsum CaSO 4 ·2H 2 O and also notable levels of impurities originating from the source phosphate rock such as Sr Ba Si P Fe Al Ti U and Th etc as well as rare earth elements REEs
Get Priceeffects of pretreatment with oxygen and oxygen containing compounds on thecatalytic behaviour of pd ag catalyst for the selective hydrogenation ofacetylene; measurement of radon 222 emanation rate from gypsum board containing phosphogypsum a gypsum board factory case study
Get PriceThe micro mineralogical characterization illustrates that the pretreatment can accelerate the early age hydration with more hydration products observed including calcium silicate hydrates and
Get PriceIn Situ Remediation of Phosphogypsum with Water Washing Pre Treatment Using Cemented Paste Backfill Rheology Behavior and Damage Evolution The accumulation of original phosphogypsum OPG has occupied considerable land resources which have induced significant environmental problems world
Get PricePhosphogypsum 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 engineering application and cost analysis of the
Get PricePhosphogypsum is a solid industry by product generated when sulphuric acid is used to process phosphate ore into fertiliser Phosphogypsum stacks without pretreatment are often piled on the land surface or dumped in the sea causing significant environmental damage
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Get PriceBrine mud 0 Caustic soda industry 3 Copper slag 0 By product from smelting of Copper 4 Fly ash 70 Coal based thermal power Plants 5 Kiln dust 1 Cement plants 6 Lime sludge 3 Sugar paper fertilizer tanneries soda ash calcium carbide industries 7 Mica scraper waste 0 Mica mining areas 8 Phosphogypsum 4 Phosphoric acid plant Ammonium
Get Priceeffective than other pretreatment methods to eliminate fluoride and organic phosphorus gypsum in phosphogypsum after pretreatment And compared with other pretreatment methods and the content of calcium sulfate loss is smallest The content of impurity results before and after pretreatment inTable 2 Experimental The Raw Material Phosphogypsum
Get PricePotential Phosphogypsum Uses Phosphogypsum is a by product of the chemical reaction called the wet process whereby sulfuric acid is reacted with phosphate rock to produce the phosphoric acid needed for fertilizer production There are approximately five tons of phosphogypsum produced for every ton of phosphoric acid produced
Get PriceIn this study a water washing pre treatment was used to purify OPG aiming to optimize the transport performance and mechanical properties of backfills The overall results proved that in treated phosphogypsum based cemented paste backfill TCPB the altered particle size distribution can alleviate the shear thinning characteristic
Get PricePhosphorus Abstract The paper deals with a treatment for obtaining phosphorus recovery from anaerobic supernatants with low phosphate concentration 30−50 mg PO 4 P/L The study was carried out at demonstrative scale inflow up to 2 m 3 /d and operative conditions as fluidized or packed bed were investigated
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Get PriceCN 102976645 A chemical patent summary
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