آخرین محصولات

Future Asian gypsum demand and supply trends: Oman

Gypsum resources are abundant in Oman, especially around the port of Salalah. With domestic demand set to grow only slowly, the potential for exports to the …

Phosphogypsum: potential uses and problems – …

Abstract. Phosphogypsum (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 …

Study on Mechanisms for Improving Quality and Whiteness …

Phosphogypsum (PG) is an industrial solid waste produced during the production of phosphoric acid through the wet process [].In 2021, the newly increased production of PG was estimated to be 80 million tons and the cumulative stacking capacity was up to 800 million tons [].The continuous dissolution of phosphorus and fluorine …

Phosphogypsum: potential uses and problems – …

Phosphogypsum (PG) is a by-product produced during the wet process of phosphoric acid (H3PO4) production from natural phosphate rocks. Approximately 4–6 tons of PG is produced per ton of ...

Effects of phosphogypsum on enzyme activity and microbial …

Phosphogypsum (PG) is a solid waste produced from decomposition of phosphate rock in sulfuric acid. It can improve the physicochemical properties of soil. However, the application of PG will ...

Omani gypsum exports rise in 2022

The Oman Daily Observer newspaper has reported that India received 4.84Mt (49%) of Omani gypsum exports during the year. This accounts for 87% of the South Asian nation's total gypsum imports, …

Sustainable Utilization of Phosphogypsum in Multi-Solid …

This study contributes to sustainable construction practices by exploring the use of phosphogypsum, a commonly discarded byproduct, in the production of recycled aggregates. Addressing both environmental and economic aspects of sustainability, we investigate the feasibility of employing phosphogypsum as a primary raw material, in …

Phosphogypsum Stacks

In 1989, stacking of phosphogypsum became a legal necessity when the U.S. Environmental Protection Agency (EPA) banned the use of phosphogypsum. In 1992, this rule was modified to allow the use of …

Properties, Purification, and Applications of Phosphogypsum: …

Phosphogypsum (PG) is a by-product produced during the wet process of phosphoric acid (H 3 PO 4) production from natural phosphate rocks. Approximately 4–6 …

Phosphogypsum: A Review of the Florida Institute of …

Phosphogypsum disposal was a very simple matter in the early days of the industry. If at all possible, you located your plant near the ocean or on a river and dumped the phosphogypsum into the sea or the river. If you were foolish enough to locate where water disposal was not possible, you suffered the economic penalty of having to stack the ...

Phosphogypsum Recycling: A Review of Environmental …

The problem of recycling and storage of phosphogypsum is topical for many countries around the world, as it is associated with environmental problems of pollution of water bodies, land, and atmosphere. Therefore, this paper analyzes the directions of phosphogypsum recycling and possible alternatives to its use. The main …

Phosphogypsum in the Circular Economy

• ^Phosphogypsum is a radioactive waste product _ • ^EPA requires that phosphogypsum be managed in above-ground stacks, which are designed to keep emissions of radon and other radionuclides in line with acceptable risk practices. •The current EPA PG rule allows very little use only in agriculture, and restricted by radium …

IAEA Analytical Quality in Nuclear Applications Series …

OMAN PAKISTAN PALAU PANAMA PARAGUAY PERU PHILIPPINES POLAND PORTUGAL QATAR REPUBLIC OF MOLDOVA ROMANIA RUSSIAN FEDERATION SAUDI ARABIA SENEGAL SERBIA SEYCHELLES SIERRA LEONE ... phosphogypsum sample number 06 the participants were asked to analyse Pb-210, Ra-226, Th-230, U …

TENORM: Fertilizer and Fertilizer Production Wastes | US EPA

Side view of phosphogypsum stack. Phosphate production generates huge amounts of phosphogypsum wastes, nearly 48 million MTs in 1988 alone. Industry estimates that 5.2 tons of phosphogypsum is produced for every ton of phosphoric acid. Phosphogypsum has little market value and is transferred as a slurry to waste piles …

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The issue has drawn attention, at least in part, because phosphogypsum includes radioactive elements. It is stored in huge stacks. Opposition to phosphogypsum in roads. Opponents raised questions …

Phosphogypsum: Properties and Potential Use in Agriculture

2.1 Phosphogypsum Generation Processes. The wet and dry process are the two main commercial processes used to produce phosphoric acid from natural phosphate. The dry process consists of a thermal reduction of rock phosphate at 2000 °C using an electrical furnace in the presence of coke or silica.

Florida needs more research on phosphogypsum's use in …

Florida Gov. Ron DeSantis recently signed a bill that will allow the Florida Department of Transportation to study the use of phosphogypsum in road construction. This came after a longstanding federal-level prohibition on using phosphogypsum, which was repealed by then-President Donald Trump's Environmental Protection Agency (EPA) in October …

Phosphogypsum as a construction material

Phosphogypsum (PG) is a by-product generated from the phosphorus fertilizer industry (phosphoric acid production). PG is similar to natural gypsum, but there are some differences, of which it contains some impurities such as water-soluble phosphate (P 2 O 5), water-soluble fluoride (F −) and P 2 O 5 substituted in the gypsum crystal …

(PDF) Moroccan Phosphogypsum: Complete Physico …

Phosphogypsum (PG) is a by-product from the industry of phosphate fertilizer industry. Approximately 5 tonnes of PG are generated for per ton of phosphoric acid production. The accumulation of PG ...

Phosphogypsum as a construction material

Introduction. Phosphogypsum (PG) is a by-product generated from the phosphorus fertilizer industry (phosphoric acid production). PG is similar to natural gypsum, but there are some differences, of which it contains some impurities such as water-soluble phosphate (P 2 O 5), water-soluble fluoride (F −) and P 2 O 5 substituted in the gypsum …

Coatings | Free Full-Text | Factors Affecting the Strength …

Phosphogypsum (PG) is a kind of industrial solid waste residue that is generated during the wet production of phosphoric acid. The main mineral composition of PG is CaSO 4 ·2H 2 O, and it is currently employed mostly in the field of building materials and the chemical industry [].PG has a complex chemical makeup and contains …

The Influence of Phosphogypsum Addition on Phosphorus …

The paper is focused on the research of biochemical treatment of sewage sludge and phosphogypsum under sulphate-reducing conditions with a phosphorus release process. The theoretical foundations of the work were based on the biochemical formalization using the principles of autocatalysis of natural systems. During the …

Reference Material IAEA 434: Naturally Occurring …

2. DESCRIPTION OF THE PHOSPHOGYPSUM REFERENCE MATERIAL The IAEA-434 reference material (RM) was collected from a processing plant located in Gdansk (Poland) in 2003. The matrix composition is: CaSO4*2H2O (96%), P2O5 (1-2%), F Total (1.2%), SiO2 (1%), Al2O3 (0.2%). The bulk material of phosphogypsum was received in 60 …

Exploring the potential reuse of phosphogypsum: A waste …

Phosphogypsum (PG), the main industrial by-product of phosphate fertilizer industry, primarily consists of calcium sulfate dihydrate. However, it contains various impurities with variable quantities depending on the origin of the phosphate rock. These impurities can restrict the reuse of phosphogypsum as a secondary primary resource.

Phosphogypsum Recycling: A Review of …

The problem of recycling and storage of phosphogypsum is topical for many countries around the world, as it is associated with environmental problems of pollution of water bodies, land, and …

Effective and innovative procedures to use phosphogypsum …

Phosphogypsum (PG) waste is a by-product generated from wet-process phosphoric acid (H 3 PO 4) manufacturing during phosphate rock decomposition.Worldwide, the annual production of PG ranges between 100 and 300 million tons, with only a few quantities utilized in several application domains (about 15%), the …

Phosphogypsum: potential uses and problems – a …

Phosphogypsum (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, …

Minerals | Free Full-Text | Characterization and Leaching

The characterization and leaching mechanism of REEs from phosphogypsum (PG) in HCl was studied in-depth. REEs contained in the PG were 208 ppm, of which Y, La, Ce, and Nd were the four most abundant elements. The modes of occurrence of rare earth elements (REEs) in the PG were quantified using the sequential …

Materials | Free Full-Text | Review of the State of Impurity

A variety of co-existing impurities in phosphogypsum limit its large-scale and high-value utilization. This paper summarizes the common contents of major impurity components (silicon and phosphorus) and trace impurity components (fluorine, iron, aluminum, and carbon) in phosphogypsum and discusses the harm of impurity …

Phosphogypsum

Environmental impact and management of phosphogypsum. Hanan Tayibi, ... Aurora López-Delgado, in Journal of Environmental Management, 2009. Phosphogypsum (PG) is a waste by-product from the processing of phosphate rock by the "wet acid method" of fertiliser production, which currently accounts for over 90% of phosphoric acid …

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