آخرین محصولات
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 …
PURIFICATION OF PHOSPHOGYPSUM FOR USE AS CEMENT RETARDER …
The cement test proved that treated PG could partially replace natural gypsum as a retarder.Keywords: phosphogypsum treatment, phosphorus pentoxide removal, calcium sulfate transition phase ...
A plant investigation into the use of treated phosphogypsum …
Once the phosphogypsum was introduced into the cement mill, samples of this material, clinker milled with it and the Plant investigation into use of treated phosphogypsum as set-retarder in OPC and OPC/fly ash blend 793 resulting cement produced were collected every hour for a period of at least 8 hours.
Investigation of cement retarder made of chemically …
Phosphogypsum was chemically pretreated by using lime solution,ammonium hydroxide,and aqueous citric acid solution,respectively.The content of impurities of purified phosphogypsum was examined and its DTA was performed.The setting time and strength of the cement produced with purified phosphogypsum were tested.Results showed …
Deep removal of phosphate impurities in phosphogypsum …
AH is difficult to use as a cement retarder because the hydration rate ofis very slow, resulting in secondary formation of ettringite, which expands and ruptures the cement-hardened body ... Treating waste phosphogypsum for cement and plaster manufacture. Cement Concr. Res., 32 (7) (2002), pp. 1033-1038, 10.1016/S0008 …
Retardation mechanism of phosphogypsum in …
Using phosphogypsum-based excess-sulfate cement (PESC) for the preparation of super retarding materials. PESC can achieve initial setting for 86 hours …
Research Progress on Resource Utilization of Phosphogypsum …
Phosphogypsum is a by-product originated from wet-process phosphoric acid, which contains some impurities such as soluble phosphorus, soluble fluorine, some salts, heavy metals and organic compounds, which lead to difficulty to be used. ... cement retarder / plasterboard / ammonium sulphate / rare-earth element; FullText(HTML) …
Utilization of solidified phosphogypsum as Portland cement retarder
The utilization of the phosphogypsum (PG) as cement retarder is both an economical and an ecological approach to treat this solid waste. Cement using raw PG as retarder has two problems pressing ...
(573f) Valorizing Phosphogypsum As a Set Retarder in …
Phosphogypsum is a by-product in phosphate fertilizers and phosphoric acid industries. It is valorized as a set retarder in Portland cement replacing the gypsum rocks. In this …
Modification of phosphogypsum using circulating fluidized …
The results show that adding 6% carbide slag and 4% CFB fly ash can effectively reduce the content of soluble phosphorus and soluble fluorine in …
EFFECT OF CALCINED PHOSPHOGYPSUM IN PORTLAND POZZOLANA CEMENT …
The utilization of the phosphogypsum (PG) as cement retarder is both an economical and an ecological approach to treat this solid waste. Cement using raw PG as retarder has two problems pressing for … Expand. 92. Save. UTILISATION OF PHOSPHOGYPSUM IN CEMENT MORTAR AND CONCRETE.
Valorization of phosphogypsum in cement-based materials: …
This work provides a literature review of the most relevant advances on cement-based phosphogypsum. The data are analysed following these steps: (i) …
Valorization of phosphogypsum in cement-based materials…
Phosphogypsum-based cement is prone to undergo moisture, due to the ease of solubilization in the presence of water. Therefore, its use is restricted to indoor environments. Some studies have been developed to improve resistance [150,151,153,[255], [256], ... Utilization of weathered phosphogypsum as set retarder …
Retardation mechanism of phosphogypsum in phosphogypsum …
Using phosphogypsum-based excess-sulfate cement (PESC) for the preparation of super retarding materials. • PESC can achieve initial setting for 86 hours and final setting for 134 hours without additional retarders, and its 28d-compressive strength is 24.9 MPa. • The retardation mechanisms of phosphogypsum in PESC has been …
Properties, Purification, and Applications of Phosphogypsum: …
Using CA as a retarder with a content of 0.5% increased the retardation time and increased the compressive strength by 90%. The addition of 16% GGBS and …
Treated phosphogypsum as an alternative set regulator and mineral
Utilisation of Phosphogypsum in Cement Mortar and Concrete, 31st Conference on Our World in Concrete & Structures (2006), pp. 16-17. Google Scholar. ... the effect of various chemical and physical treatments of a South African phosphogypsum to render it suitable as a set retarder for cement. Cement Concr. Res., 33 (8) (2003), …
(573f) Valorizing Phosphogypsum As a Set Retarder in Portland Cement
In this industry, influence of phosphogypsum contents on concrete and Portland cement properties was investigated. Phosphogypsum was mixed with Portland cement at different mass contents extended from 1% to 20% wt/wt. Setting time, specific area of Portland cement and response to compression strength were followed.
Phosphogypsum | US EPA
Phosphogypsum 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 in …
Effect of Phosphogypsum on the Properties of …
Properties of phosphogypsum were evaluated and then the effect of various level phosphogypsum addition (2, 5, 10 and 15 percent by weight of cement) with Portland cement clinker was …
PHOSPHOGYPSUM AS SET RETARDER IN PORTLAND CEMENT …
Phosphogypsum as set retarder in Portland cement - Synopsis - The possibility of using phosphogypsum containing maximaai 0^5% Pfi; set retarder in Portland cement was investigated. Test results showed that the phosphogypsum performed as an effective set i effect on strength development.
Phosphogypsum production and utilization in China
Phosphogypsum (PG) is a radioactive industrial by-product produced in large quantities when processing phosphate ores into fertilizers. With rapid growth of high concentration phosphate and compound fertilizers production in China, PG production is increasing every year. ... Eco - concrete made with phosphogypsum-based super …
Valorizing Phosphogypsum as a Set Retarder in …
The specific surface area (c m2/g) of grinded mixtures of cement and phosphogypsum was measured using Blaine test (relation of Arcy-Kozeny). The setting regulator parameter was determined for cement-phosphogypsum mixtures. An amount of 650 g of cement or cement-PG mixture was mixed with 156 mL of
Utilization of solidified phosphogypsum as …
The utilization of the phosphogypsum (PG) as cement retarder is both an economical and an ecological approach to treat this …
Utilization of phosphogypsum in portland cement industry
However, the compressive strengths were similar at early ages but somewhat higher at later ages. When added to the cement plant rawmix, the phosphogypsum acted both as a mineralizer for clinker and a set retarder for cement made from this clinker. Vol. 7, No. 5 543 PHOSPHOGYPSUM, CLINKER, STRENGTH, RETARDATION Due …
Modification of phosphogypsum using circulating fluidized …
This study uses carbide slag, circulating fluidized bed (CFB) fly ash, and other solid wastes to comprehensively modify phosphogypsum required for preparing the …
Modification of phosphogypsum using circulating fluidized …
The utilization of the phosphogypsum (PG) as cement retarder is both an economical and an ecological approach to treat this solid waste. Cement using raw PG as retarder has two problems pressing ...
Effect of different retarders on setting time and mechanical …
1. Introduction. Phosphogypsum (PG) is a typical industrial waste from the production of phosphoric acid [1], [2], [3]. 5 tons of PG will be generated for every ton of phosphoric acid.With a typical proportion of up to 90%, calcium sulfate dihydrate (CaSO 4 ·2 H 2 O) makes up the majority of the chemical composition of PG [4], [5].However, due …
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 …
Application of lime neutralised phosphogypsum in supersulfated cement
The inevitably incorporation of P 2 O 5 impurity results in the poor quality of phosphogypsum (PG), which further hinders the utilisation of PG in manufacturing the supersulfated cement (SSC), an environment-friendly and energy-saving cement made almost entirely from industrial waste. Lime neutralisation provides a sustainable …
Valorization of phosphogypsum in cement-based materials…
China is a significant producer of phosphogypsum production; the annual growth rate of phosphogypsum is about 70 million metric tons, of which the comprehensive utilization rate is only 15 percent.
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