Phosphorus chemical companies in China are primarily clustered within phosphorus-rich provinces like Sichuan, Hubei, Guizhou, and Yunnan, with an annual production of 75 × 10 6 t of PG in 2020 (Cui et al., 2022b).Under the combined pressures of ecological environmental preservation and rising economic costs, the structure of PG recycling industry in …
Firstly, the pH value of phosphogypsum in a phosphogypsum yard in Yunnan was tested. Phosphogypsum with a pH range of around 2 ∼ 3 was selected. After the test was completed, a grinder was used to grind the phosphogypsum to a particle size of 20–30 μm. Subsequently, phosphogypsum, sodium bicarbonate, cement, fly ash, and polyacrylamide ...
When phosphorous chemical enterprises adopt wet process to produce phosphoric acid, a large amount of solid waste phosphogypsum (PG) will be produced (Wu et al. 2022a;Mishra et al. 2010;Silva et ...
Phosphogypsum (PG) is a typical byproduct of the phosphate fertilizer industry's sulfuric acid-process phosphoric acid production. ... Phosphogypsum(PG) was obtained from Yunnan Yuntianhua Co., Ltd, China, with a particle size range of 20–280 μm and a moisture rate of 18.7%. The PG used throughout the experiment was first aged naturally for ...
The phosphogypsum is a chemical waste with enormous emission. The controlled and sustained compound fertilizer is mainly manufactured by processing the phosphogypsum and carbamide or urea resin, and other traditional fertilizer components can be added according to requirements. ... Yunnan Province is on the low side, impose phosphogypsum after ...
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 phosphoric acid production, where worldwide PG generation exceeds 300 million tons annually. The vast majority of produced PG is discarded irresponsibly, leading to …
ICL's subsidiary in China, YPH, holds two phosphate mining licenses from the Division of Land and Resources of China's Yunnan District. In 2022, YPH was awarded a Green Mine certification from Chinese authorities (ranked AAAAA) for excellence in mine planning, operations and mine remediation. PRODUCTS & RAW MATERIALS kt = THOUSANDS OF TONNES RAW ORE […]
Phosphoric acid manufacturing generates large amounts of phosphogypsum (PG); a by-product generally disposed in the surface or evacuated in the seawater without any pretreatment. Phosphogypsum may host non-negligible amounts of valuable elements such as rare earth elements (REEs), which are critical elements on the global market. Surface disposal …
Phosphogypsum 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.
Phosphogypsum (PG) is a by-product of solid waste produced by the phosphate chemical industry. Owing to large emissions and massive storage issues, it causes a potential …
Under a modified phosphogypsum (MPG) treatment, the effective removal of bound water and risky heavy metals from sludge has been achieved. In this paper, the effects of the operating parameters on sludge treatment, variations …
In this study, phosphogypsum (PG) is simulated by doping fluorine and phosphorus ions in an analytically pure reagent of gypsum dihydrate. The influence of fluorine and phosphorus impurity and content on the dehydration reaction process of phosphogypsum and its crystalline micromorphology is assessed during the preparation of α-type gypsum hemihydrate …
As the world's largest producer of phosphate fertilizer and the largest producer of phosphogypsum byproducts, in particular, places like Yunnan, Guizhou, Sichuan, and Hubei have more concentrated deposits. …
Ball milling can significantly reduce the standard consistency water requirement of phosphogypsum, resulting in a shorter setting time and higher strength of phosphogypsum. In …
China also has significant production of phosphogypsum, and the five largest provinces in terms of production are Hubei, Yunnan, Guizhou, Sichuan, and Anhui [5]; hence, they these also have large ...
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 ...
Kunming Yunnan China Kunming China. Senlin Dong. Kunming University of Science and Technology ( email) Bo Hu. Kunming University of Science and Technology ( email) ... At present, due to the large production of phosphogypsum (PG), it is imperative to seek a new PG resourcing pathway. This work provides an overview of the state.
Based on the physical and chemical properties of red sandstone (RS), RS is used to produce composite cementitious materials. The flowability, mechanical strength, and micromechanics of a red sandstone–cement binary cementitious material (RS-OPC) were investigated as functions of the amount of RS replacing the cement (OPC). Additionally, the …
This paper summarizes the generation process, impurity removal treatment (physical method, chemical method, heat method), high-value utilization (nanometer calcium sulfate whisker, nanometer calcium carbonate) of …
Chemical looping gasification of phosphogypsum as an oxygen carrier: The Ca and S migration mechanism using the DFT method Sci Total Environ. ... Kunming, Yunnan 650093, China. 2 Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China. Electronic address: …
An enterprise in Yunnan is the largest high concentration phosphate compound fertiliser producer in China, with an annual production of about 2.3 million tonnes of phosphoric acid ( P 2 O 5) and 13 million tonnes of phosphogypsum (dry basis), and a comprehensive utilisation rate of about 26% in 2022, which is still far from the national ...
Phosphogypsum is a by-product of phosphoric acid industrial production, and its stacking volume is increasing year by year, which brings a great threat to the environment and agricultural safety. The way of comprehensive utilization of phosphogypsum was described, and the mechanism of phosphogypsum producing cement, preparing ammonium sulfate, …
phosphogypsum by direct extraction. which would guide the resource utilization of high-silica phosphogypsum. 2.1. Materials The PG sample was obtained from Phosphorus Chemical Industry Co., Ltd., Yunnan Province, China. The chemical composition analysis results of the PG sample are presented in Table 1. The results
Phosphogypsum (PG), a byproduct during the phosphoric acid production process, also known as the wet process, contains complex and diverse impurities, resulting in low utilization and considerable accumulation. This leads to a massive waste of land resources and a series of environmental pollution problems. Given the current urgent ecological and …
Phosphogypsum is the most significant industrial solid waste in the world. Phosphogypsum has a complex composition and its traditional storage methods occupy large areas of land and also damage the environment. Currently, phosphogypsum is mainly used for the direct preparation of construction materials and chemical auxiliary materials, but the …
Review on high-value utilization of phosphogypsum: Utilization of calcium and oxygen resources present in phosphogypusm. Author links open overlay panel Jie Yang a, Senlin Dong a b, ... (No. 52300160, No. 21176108, No. 21666016 and No. 21868014), Sichuan Science and Technology Program (No. 2022 JDRC0101), Yunnan Fundamental Research Projects ...
Phosphogypsum of Yunnan Yuntianhua limited liability company. Original whiteness 32.8 %, analysis of the main chemical components shown in Table 1. Table 1 Phosphogypsum component
This paper studied effect of different pretreatment process on Yunnan phosphorus building gypsum strength and crystal morphology such as washing method, lime neutralization …
Phosphogypsum is a solid powder that was taken from Kunming City in Yunnan Province. It has a water content of 15–20% and a pH of 4.2. The phosphogypsum was dried to constant weight in an oven at 50 °C before the experiment. The specific surface area was determined to be 180 m 2 /kg by the Blaine method .