Gasification Performance and Mechanism of High-Silicon Phosphogypsum …
The phosphogypsum (PG) stockpile in Yunnan, China, is one of the largest accumulations of PG. Our group has focused on the application of chemical looping gasification (CLG) with a PG oxygen carrier characterized by high silicon content. FactSage 7.1 software was used for the thermodynamic simulation analysis of the reaction mechanism and reaction …
Comprehensive Utilization of Phosphogypsum and …
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, …
Harmless treatment technology of phosphogypsum: …
Phosphogypsum (PG) was taken from Yunnan Yuntianhua Co., Ltd., with a moisture content of 18.5%. Lime (L) was purchased from Hunan Baicheng Technology Co., Ltd., with CaO content ≥90%. Calcium carbide slag (CS) was taken from Kunming heat source plant in Yunnan Province, China, which is alkaline solid waste with a moisture content of 6.1%.
Role of polyacrylamide in the removal of soluble phosphorus …
Phosphogypsum, an industrial solid waste produced in wet phosphoric acid production, is difficult to be utilized due to the harmful impurities such as phosphorus and fluorine. In this study, lime neutralization process was introduced to remove soluble phosphorus and soluble fluorine from phosphogypsum in presence of polyacrylamide. The effects of …
Experimental Study on Pretreatment of Preparing …
The needs of phosphogypsum for experiments are all from Yunnan Da Huanglin company that annually product phosphogypsum about 4 ~ 5 million tons. Phosphogypsum is a by-product of phosphorus industry, containing phosphorus, fluorine and
Research on the Performance of Phosphorus Building …
the phosphogypsum "production by use" policy, represented by Guizhou Province, from the reduction of incremental and stockpile reduction, all-round phosphogypsum consumption, to accelerate the comprehensive utilization of phosphogypsum has put forward new requirements. An enterprise in Yunnan is the largest high concentration
A novel phosphogypsum based self-produced gas …
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 ...
Sustainable Utilization of Phosphogypsum in Multi …
Addressing both environmental and economic aspects of sustainability, we investigate the feasibility of employing phosphogypsum as a primary raw material, in collaboration with various solid waste components, …
Jie YANG | Specially-appointed professor
The phosphogypsum (PG) stockpile in Yunnan, China is one of the largest accumulations of PG. Our group has focused on the application of chemical looping gasification (CLG) with a PG oxygen ...
Chemical looping gasification of phosphogypsum as an …
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: …
Application of phosphogypsum in soilization: a review
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 …
A systematic review of phosphogypsum recycling industry …
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 …
Preparation and Micromechanics of Red Sandstone–Phosphogypsum …
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 …
A novel method for purification of phosphogypsum
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 ...
Properties, Purification, and Applications of Phosphogypsum…
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 …
Experimental Study on Phosphogypsum Desilication by …
Experimental Study on Phosphogypsum Desilication by Flotation[J]. Multipurpose Utilization of Mineral Resources, 2014, (6): 39-42. doi: 10.3969/j.issn.1000-6532.2014.06.010. Zhu Pengcheng, Wang Guodong, Zeng Bo. Experimental …
Review on Phosphogypsum High Value Utilization: …
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.
Preparation of high-performance lightweight materials …
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 ...
Effect of Fluorine and Phosphorus Impurities in Phosphogypsum …
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 …
On Pretreatment Experimental Study of Yunnan Phosphorus …
This paper studied effect of different pretreatment process on Yunnan phosphorus building gypsum strength and crystal morphology such as washing method, lime neutralization …
Review on high-value utilization of phosphogypsum: …
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 ...
ICL JV YPH | China
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 […]
Research on the Performance of Phosphorus Building …
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 …
Reuse of phosphogypsum pretreated with water washing as …
As a typical solid waste, phosphogypsum (PG) is the by-product generated during the exploitation of phosphate resources 1,2,3. Global production of PG is estimated to be around 100–280 Mt ...
On Pretreatment Experimental Study of High Strength Gypsum by Yunnan
This thesis mainly studies the preprocessing of making high strength gypsum powder by using phosphogypsum. And bring out the new preprocessing of phosphogypsum from the traditional methods. And the new method improved the traditional 3 kinds of processing methods. After processing of phosphogypsum, strength and crystal morphology were compared to shown …
Harmless treatment technology of phosphogypsum: …
The main harmless treatment technology of phosphogypsum is slurry solidification, but the consumption of phosphogypsum is seriously hindered by low dosage, high operation …
The Impurity Removal and Comprehensive Utilization of Phosphogypsum…
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 …
Feasibility analysis for decomposition of phosphogypsum in …
Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, People's Republic of China. Search for more papers by this author. ... In this article, combining the characteristic of precalciner in NSP technique and the thermal analysis for phosphogypsum, the adaptability of decomposition ...
Geochemical and mineralogical characterization of phosphogypsum …
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 …
The Generation Process, Impurity Removal and …
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 …