A novel method for purification of phosphogypsum
impurities, the phosphogypsum concentrate reached the first grade national standard of the phosphogypsum building materials in China. The method is cheap and practical, Phosphogypsum (PG) is a solid waste produced during chemical wet phosphoric acid production [1]. The main ingredient in PG is calcium sulphate dihydrate, Simple and efficient method for purification and ScienceDirect
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A Precipitation-Adsorption Technique for the Removal of
Phosphogypsum (PG) is a by-product of solid waste produced by the phosphate chemical industry. Owing to large emissions and massive storage issues, it Phosphorus and fluorine in phosphogypsum are largely soluble in water. Owing to their solubility in water, they can be effectively removed by rinsing, filtering, A Novel Process to Recover Gypsum from Phosphogypsum
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The Generation Process, Impurity Removal and High
This paper summarizes the generation process, impurity removal treatment (physical method, chemical method, heat method), high-value utilization (nanometer calcium sulfate whisker, nanometer calcium The process relied on the variation of EDTA chelation properties towards monovalent, divalent, and trivalent cations at different pHs. According to the findings of Staged purification of phosphogypsum using pH-dependent
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Reuse of phosphogypsum pretreated with water washing as
In the cemented PG backfill process, the aggregate PG (over 80% by dry weight) is mixed with binder and water to a heterogeneous backfill slurry, which is then After being stirred homogeneously, the mixtures were cast into plastic, cylindrical molds (Ø50 × 100 mm) and hydrated for 24 h. Subsequently, the OCPB and In Situ Remediation of Phosphogypsum with Water-Washing Pre
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Treating waste phosphogypsum for cement and plaster
Recently, a process has been developed at the Central Building Research Institute for the beneficiation of phosphogypsum wherein impurities, particularly Phosphogypsum (PG), which is widely used as a building material in the industrial field, is a solid by-product from the wet production process of phosphoric acid. 14,15 In agriculture, phosphogypsum is used as a soil fertilizer due to its high levels of Ca, Al, and Si, and its porous structure. 16 In recent studies, several minerals with a porous structure are Effects of flocculant-modified phosphogypsum on sludge
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(PDF) The Generation Process, Impurity Removal and
For the moment, the storage quantity of phosphogypsum is still rising as a result of the increasing phosphate fertilizer production to meet the food demand in China. This paper summarizes thePhosphogypsum is a solid waste byproduct from processing phosphate ore to make phosphoric acid that is later used in fertilizer. Phosphogypsum contains radium, which decays to form radon gas. Both radium and radon are radioactive and can cause cancer. The Clean Air Act regulations require that phosphogypsum be managed Phosphogypsum US EPA
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Radiation and Phosphogypsum Florida Polytechnic University
The radium is filtered out with the solids. The solid portion is known as phosphogypsum. • Phosphogypsum produced in North Florida contains roughly 5 10 picocuries per gram (pCi/g) of radium while phosphogypsum from Central Florida contains about 20 35 pCi/g radium. • The U.S. EPA prohibits the use of phosphogypsum.Phosphogypsum (PG) tailings from phosphate processing (fertilizer production) are an underestimated resource of remaining phosphate and critical metals (such as heavy REE and Y).Extraction of critical technology elements and radionuclides
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Phosphogypsum: potential uses and problems a review
Phosphogypsum (PG: CaSO42H2O) is a . e moisture conten t is . To address this issue, this study employed a two-stage flotation process to remove the majority of impurities,To address this issue, this study employed a two-stage flotation process to remove the majority of impurities, including SiO2, organic substances, and fine slime adhered to the surface of PGRecycling of phosphogypsum to prepare gypsum plaster: Effect
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Preparation of gypsum with high purity and whiteness from phosphogypsum
The currently applied methods for impurity removal from phosphogypsum mainly eliminate the influence of phosphorus and fluorine impurities on gypsum-building materials 6 10. However, phosphogypsum is produced predominantly in the suburbs, which limits its wider or high-end utilization and transportation distance 11 .Natural gypsum stone contains (3-5)% moisture and phosphogypsum (30-40)%. This leads to an increase in thermal energy consumption of several times, as evaporation of moisture is a very energy-intensive process. Therefore, wet purification of phosphogypsum is energy-efficient and makes existing technologies uncompetitive SVXP Study on Pretreatment of Phosphogypsum IOPscience
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Recycling phosphogypsum in road construction materials and
Therefore, removing intergranular phosphate impurities during pretreatment is important for utilising PG in cement. Manjit Singh treated phosphogypsum using a 3–4% aqueous citric acid solution and rinsed it with water for purification (Singh, 2002). This method can partially remove intergranular phosphate impurities with good for the impurity removal and high-value utilization of phosphogypsum material as a contribution to sustainability. Keywords: phosphogypsum material; generation process; impurity removal; high-value utilization; Nano-CaCO3; Nano-calcium sulfate whisker 1. Introduction China is a large country and rich in calcium resources, with The Generation Process, Impurity Removal and High-Value
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Technological properties of phosphogypsum binder obtained
Dihydrate phosphogypsum (CaSO 4 ⋅2H 2 O) (PG) analyzed in this work is a waste generated by the fertilizer production plant AB Lifosa (Lithuania) in wet-process phosphoric acid production, wherePhosphogypsum (PG: CaSO 4 2H 2 O) is a waste product generated by the phosphate industry. World production of this waste exceeds 200 million tonnes per year. PG, discharged into the sea, watercourses or in wilderness stocks, contains toxic elements harmful to ecosystems and human health, including heavy metals and radionuclides, and Phosphogypsum: potential uses and problems a review
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process of remove moisture in phospogypsum
Process for purifying phosphogypsum Google Patents. A process for reducing radioactive contamination of phosphogypsum. Phosphogypsum containing radioactive material is calcined to form hemihydrate crystals carrying the radioactive contaminants, and a portion of the crystals is converted to substantially radiation-free gypsum crystals which Phosphogypsum is one of the typical by-products of phosphorus chemical industry.As a strategic industry related to the national livelihood of China, phosphorus chemical industry has accumulated and produced a significant amount of phosphogypsum. In general, phosphogypsum contains approximately 80%–95% calcium sulfate Harmless treatment technology of phosphogypsum: Directional
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Recycling of Iron and Alumina from Red Mud After Co-Sintering
Red mud (RM) and phosphogypsum (PG) are two types of industrial solid waste that not only pollute the environment but also fail to adequately exploit the potential of secondary resources. In this study, a three-step process based on alkali lime sintering, leaching, and magnetic separation was developed to realize the recovery of aluminum A scientist from the USA has developed a process for converting phosphogypsum by ammoniating said product at a pH of 6.5 or less and adjusting the phosphorus and potassium values of said ammoniated product by addition of one or more sources of potassium and phosphorus. The result of his research is a granulated Industrial processing of phosphogypsum into organomineral
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(PDF) Complex Processing of Phosphogypsum a Way of
According to the literature data, in the process of ion flotation of metal cations, the increase in removal occurs in the рН range of hydrate formation [29,30], that is, metal cations areAfter leaching process for phosphogypsum by water deionized and obtain dried at 40 °C to remove trapped moisture in a vacuum oven. Then 20 wt. % of PPSU with variousRemoval of Heavy and Radioactive Elements from Phosphogypsum
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Molecules Free Full-Text Study of Semi-Dry High Target MDPI
Phosphogypsum (PG) treatment is one of the research hotspots in the field of environmental protection. Many researchers both at home and abroad have devoted themselves to studies on harmless resource treatment of PG, but the treatment technology is unable to meet the demand of PG consumption due to the huge production and
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