Phosphogypsum - Wikipedia
Phosphogypsum (PG) is the calcium sulfate hydrate formed as a by-product of the production of fertilizer, particularly phosphoric acid, from phosphate rock. It is mainly composed of gypsum (CaSO 4 ·2H 2 O).
Phosphogypsum | US EPA
5 天之前 · Phosphogypsum is a solid waste byproduct from processing phosphate ore to make phosphoric acid that is later used in fertilizer. The phosphate ore and the resulting phosphogypsum contain radium, which decays to form radon gas. Both radium and radon are radioactive and can cause cancer.
EPA Approves Use of Phosphogypsum in Road Construction
2020年10月14日 · Phosphogypsum, a byproduct material of phosphate fertilizer production, is by regulation disposed of in massive, above-ground piles, commonly called “stacks.” Each “stack” can span thousands of yards, be higher than a football field, and contain approximately 70 million tons of phosphogypsum.
Properties, Purification, and Applications of Phosphogypsum: A ...
2024年2月26日 · 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 tons of PG is produced per ton of phosphoric acid production, where worldwide PG generation exceeds 300 million tons annually.
Phosphogypsum - an overview | ScienceDirect Topics
Phosphogypsum (PG) is a bulk industrial solid waste of wet-process phosphoric acid production. Every ton of phosphoric acid production generates as many as 4–6 tons of PG, including more than 90% of CaSO 4 ·2H 2 O, a small amount of phosphorus, fluorine, organic matter, oxides, heavy metals, radioactive substances and other impurities that ...
Phosphogypsum recycling: New horizons for a more …
2020年7月1日 · Phosphogypsum (PG) is the by-product of the wet chemical attack process of phosphate ores (apatite) by sulfuric acid [1, 2]. It consists mainly of calcium sulfate dihydrate (CaSO 4 ·2H 2 O) in association with low amounts of silicon (Si), fluoride (F), phosphorus pentoxide (P 2 O 5 ), organic matter, traces of rare earth elements (REE) and ...
A review on the environmental impact of phosphogypsum and …
2022年1月1日 · Phosphogypsum (PG) is a solid by-product generated in the production of phosphoric acid (PA) using conventional synthesis methods. The raw material, about 50 times more radioactive as compared to unperturbed soils, is dissolved in diluted sulfuric acid (70%) forming PG and PA.
Phosphogypsum: potential uses and problems – a review
2017年6月19日 · 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, watercourses or in wilderness stocks, contains toxic elements harmful to ecosystems and human health, including heavy metals and radionuclides, and there is ...
Radioactive Material From Fertilizer Production | US EPA
2024年9月3日 · Phosphogypsum, a waste product from manufacturing fertilizer, emits radon, a radioactive gas. It also contains the radioactive elements uranium, thorium and radium. Phosphate rock mining is the fifth largest mining industry in the United States in terms of the amount of material mined.
Phosphogypsum: Properties and Potential Use in Agriculture
2023年2月28日 · Determine the physical, chemical, and radioactive properties of phosphogypsum. Discuss the uses of phosphogypsum in agriculture as a fertilizer, amendment to degraded soils, and as an additive fertilizer industry. Define the PG impacts on crop production, soil, water, and environment.