Phosphogypsum fluoride content

Phosphogypsum fluoride content

Case study heavy metals and fluoride contents in the materials of

Fluoride content in PG was % The presence of PG piles showed no impact on the run off and ground and lake waters in the area However fluoride concentration was double the permissible airborne threshold in the sites to the east of the PG piles because of the prevailing wind in the region

Simultaneous and Efficient Removal of Fluoride and Phosphate in

Thus there is a need to develop feasible materials or technologies to remove both fluoride and phosphate in acidic phosphogypsum leachate In this study sulfoaluminate cement SC was used to simultaneously remove fluoride and phosphate in wastewater based on its moderate alkalinity and rich content of metal ions

Difference Between Gypsum and Phosphogypsum

The key difference between gypsum and phosphogypsum is that gypsum is a naturally occurring form of calcium sulfate whereas phosphogypsum is a synthetic f plastic like when we heat it up to 175°C This nature of Gypsum is important in producing plaster of Paris If the content of CaSO 4 ·2H 2 O in gypsum is high chiefly fluoride and

UG Mat Sulfate Wastes Recycled Materials Resource Center

Phosphogypsum is generally classified as a silt or sandy silt 12 Material that has been stacked for some time tends to develop agglomerations thus reducing its fineness or percentage passing the mm No 200 sieve Moisture Content The moisture content or amount of free moisture in phosphogypsum may range from 3 to 20 percent

The use of fluoride as a natural tracer in water and the relationship

Investigations within the Silverton caldera in southwestern Colorado used a combination of traditional geological mapping alteration assemblage mapping and aqueous geochemical sampling that showed a relationship between geological and hydrologic features that may be used to better understand the provenance and evolution of the water Veins containing fluorite huebnerite and elevated molybden

Highly efficient fluoride retention in on site solidification

Phosphogypsum PG is a massively generated hazardous by product in the phosphorus industry Large scale efficient profitable on site recycling is an emerging topic for promoting sustainable phosphorus circularity and mitigating potential human exposure In this work we integrated a green and low …

Recovery of nano calcium fluoride and ammonium bisulphate from

The obtained results confirm the efficiency of this procedure which synthesises at room temperature the calcium fluoride in the form of nano crystalline powder and the ammonium bisulphate salt from the exact stoichiometric proportions of phosphogypsum hydrofluoric acid and ammonia

Journal of Environmental Science and Health Part A

All journal articles featured in Journal of Environmental Science and Health Part A vol 35 issue 1

calciumdibasicphosphate

cyanide A plastic appliance was used for the operation Precision weigh% sodium fluoride dried at 1051C for 4 hours put it in a 100ml measuring flask add appropriate amount of water to dissolve and add buffer solution take sodium citrate 73 5G add water 250ml to dissolve that is 5 0 0 m l diluted with water to the scale shake that is the fluoride standard stock solution l/lm

Phosphogypsum Conversion into Calcium Fluoride and Sodium Sulfate

This last is recommended in detergent and glass industry while the resulting CaF2 can be utilized in metallurgical industry The optimum conversion conditions were achieved with the

EPA Approves Use of Phosphogypsum in Road Construction

Phosphogypsum is a byproduct material of phosphate fertilizer production It is regulated for the presence of radium 226 a naturally occurring radioactive substance that produces radon gas a hazardous air pollutant The Clean Air Act requires the disposal of phosphogypsum in stacks except for limited agricultural and research uses

Simulating Experimental Study of Phosphate and Fluoride on the

Abstract In this paper phosphate and fluoride were added into the gypsum respectively to simulate phosphate and fluoride in the phosphogypsum The affect of adding different impurities on setting time compressive strength and bulk density were inspected by simulation experiments

Fluoride Action Network Piney Point Citizens Petition to EPA for

February 8 2024 Administrator Environmental Protection Agency 1200 Pennsylvania Avenue NW #1101A Washington 20460

Hydrogen fluoride concentrations in ambient air of an urban PubMed

Hydrogen fluoride HF is one of the most toxic gaseous compounds in air the primary anthropogenic source of which is industrial activity specifically fertilizer and waste HF concentrations in an urban area Huelva SW Spain related to a nearby major phosphogypsum PG deposit were measured by p …

PDF Biomass Mediated Conversion of Acidic Phosphogypsum into Alkaline

expensive Phosphogypsum waste utilization can be broadened by solving its limitations like acidic pH and reducing concentration of toxic contaminants fluoride The novelty of current research work is value addition of phosphogypsum by using waste biomass and process without chemicals Potassium rich

Standard Test Methods for Analysis of Calcium Chloride ASTM International

These test methods cover the analysis of calcium chloride and solutions Procedures are given for the determination of calcium chloride magnesium chloride potassium chloride sodium chloride and calcium hydroxide The test methods appear in the following order The values stated in SI units are to be regarded as standard The

Potential Phosphogypsum Use Florida Poly

Potential 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

Simultaneous and efficient removal of fluoride and phosphate in

The high concentration of fluoride and phosphate in phosphogypsum leachate is harmful to the environment and ecosystem Thus there is a need to develop feasible materials or technologies to remove both fluoride and phosphate in acidic phosphogypsum leachate

Potential Phosphogypsum Use Florida Poly

An exception is made for phosphogypsum with an average concentration of less than 10 pCi/g radium which can be used as an agricultural amendment but for no other use Phosphogypsum in north Florida has 10 pCi/g radium Central Florida phosphogypsum averages 26 pCi/g radium For more information on the EPA ban see Phosphogypsum and the EPA Ban

The effect of phosphogypsum as the mineral feed additive on fluorine

DOI / Corpus ID 95766136 The effect of phosphogypsum as the mineral feed additive on fluorine content in eggs and tissues of laying hens article{Grecki2006TheEO title={The effect of phosphogypsum as the mineral feed additive on fluorine content in eggs and tissues of laying hens} author={Henryk G{ o}recki and Katarzyna J Chojnacka and Zbigniew Dobrzański

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Method for recovering rare earth elements from phosphogypsum

Depending on the REE content in the starting material and the conditions of sulfuric acid phosphogypsum the solution contains g / l REE It was found that to increase the degree

Applied Sciences Free Full Text Phosphogypsum Recycling A Review

During dry storage without pre neutralization an average of % fluorine is released into the gas phase in terms of dry matter contained in phosphogypsum Dust rising above the dumps contains an average of up to 10 g of fluorine per 1 ton of phosphogypsum dust distribution radius is up to km [ 17 ]

Recovery of nano calcium fluoride and ammonium bisulphate from

The total conversion of phosphogypsum is achieved after reaction time equal to one hour and a half Generally this novel procedure offers not only a solution for reducing phosphogypsum waste and fluorine gas emission but also gives rise to valuable products useful to industry and agriculture KEYWORDS

Fluoride Action Network Phosphogypsum Regulations Are Appropriate

The radium 226 and 228 primarily go with the phosphogypsum waste The phosphogypsum waste that results from treating Central Florida phosphate rock with sulfuric acid contains an average of 21 to 27 picocuries per gram of radium 226 plus various heavy metals such as arsenic barium cadmium and lead

Development of a process for the removal of natural radionuclides and

Request PDF Development of a process for the removal of natural radionuclides and other stable pollutants from acid phosphogypsum stacks leachates In Huelva there are phosphogypsum PG

A Novel Process to Recover Gypsum from Phosphogypsum

In this study we investigated a coarse phosphogypsum containing % SO 3 % CaO % % SiO 2 % P 2 O 5 % F CaSO 4 ·2H 2 O purity of % and whiteness of Phosphogypsum contains calcium sulfate dehydrate as the main mineral with small amounts of brushite quartz muscovite and zoisite

Simultaneous and Efficient Removal of Fluoride and Phosphate in

The main products of fluoride removal were CaF₂ AlF₃ and FeF₂ and the main products of phosphate removal were CaHPO₄·2H₂O H₃O ·AlP₂O₆ OH ₂ Ca₂SiO₄·Ca₃ PO₄ ₂ and Fe₃ H₂PO₄ ₃

Conversion of Moroccan phosphogypsum waste into nano calcium fluoride

The recrystallized salt is characterized by high contents of sulfur wt% sodium wt% and H 2 O wt% The major impurities existing in this salt are F and Ca The presence of fluoride % in NaHSO 4 ·H 2 O is due to the CaF 2 fine particles which moved to salt through the filtration

A Precipitation Adsorption Technique for the Removal of Fluoride and

When ACP FA HBM and Ur were added to PG at a dosage of 3% % % and % respectively the residual phosphate and fluoride contents was mg/L and mg/L respectively in the PG leaching solution Compared to state of the art approaches this method exhibited higher efficiency in removing phosphate and fluoride

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