Recycling of phosphogypsum for low-carbon cement: …

DOI: 10.1016/j.jobe.2024.111195 Corpus ID: 273772571; Recycling of phosphogypsum for low-carbon cement: clinker production, mechanical properties and hydration mechanism @article{Zhang2024RecyclingOP, title={Recycling of phosphogypsum for low-carbon cement: clinker production, mechanical properties and hydration mechanism}, author={Ji-xi Zhang and …

Deep removal of phosphate impurities in phosphogypsum …

Efficient removal of phosphate impurities in waste phosphogypsum for the production of cement. Sci. Total Environ., 780 (2021), Article 146600, 10.1016/j.scitotenv.2021.146600. View PDF View article View in Scopus Google Scholar [21]

Mechanical properties and modification mechanism of phosphogypsum …

Abstract The red clay is widely distributed in Guizhou province, which is characterized by high natural moisture content, difficult compaction and serious shrinkage and crackingin, and phosphogypsum is discharged for 5 million tons every year in Guizhou province. For the sake of effectively reducing the accumulation of phosphogypsum, mixtures were …

Usage of biowashing to remove impurities and heavy metals …

Raw phosphogypsum (RPG) and calcined phosphogypsum (CPG) were treated by biowashing, and the potential of treated PG used for cement paste preparation was investigated. The effects of biosolution on the stability of PG and the growth of bacteria in RPG and CPG were analyzed by zeta potential and optical density.

Effect of Phosphogypsum on the Properties of Portland Cement

The present paper deals with the experimental investigation on compressive, tensile and flexural strength characteristics of partially cement replaced phosphogypsum concrete using 0%., 10%, 20% ...

Treating waste phosphogypsum for cement and plaster manufacture

PG-based cementitious systems can achieve high compressive strength (60 -80 MPa). Calcination decreases PG impurities and increases mechanical resistance. To foster …

Treating Waste Phosphogypsum for Cement and Plaster …

In the investigation reported in this paper, treatment of phosphogypsum with aqueous citric acid solution was attempted to purify phosphogypsum and improve its quality to …

Application of phosphogypsum for the improvement of eco …

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 investigated.

Effect of Modified Phosphogypsum on Properties of Cement …

Using lime neutralization to pretreat PG, the pH value, mortar consistency and setting time, activation index, and physical properties as well as the Fourier transform infrared …

Utilization of solidified phosphogypsum as Portland 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 …

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],

Phosphogypsum – An Industrial Byproduct with Value

Phosphogypsum has been studied for use in cement, bricks, plaster, and more, often with added benefits over materials. When used as a replacement for limestone, for example, phosphogypsum has proven to offer a better roadbed.

Modification of phosphogypsum using circulating fluidized …

From 3.1 Soluble phosphorus and soluble fluorine contents of modified phosphogypsum at different aging time, 3.3 Effect of modified phosphogypsum on properties of cement, it can be seen that when the undisturbed phosphogypsum content is 90% and the ratio of carbide slag to CFB fly ash is 6:4 (GX3), the modification effect is the best, and it ...

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 …

Resource utilization and development of phosphogypsum …

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 have serious …

Effect of calcium sulfoaluminate cement on the hydration …

Although in phosphogypsum slag cement paste, the cumulative heat release of the cement paste in 3 d increases from 78.4 J g −1 to 124.8 J g −1 as the CSA cement content rises from 0% to 15%, it remains lower than the 3-day cumulative heat release of general low heat Portland cement and is significantly below the requirements for low heat ...

Use of Mixture Design Approach for the Optimization and

The present study investigated the effect of partial Portland cement replacement by mineral admixtures including silica fume, fly ash and purified phosphogypsum at different proportions on the mechanical properties of mortar such as compressive strength and flexural strength, and on the initial setting time using the mixture design approach. This research aims …

Compressive performance of non-fired phosphogypsum …

This study investigates the possible use of phosphogypsum, a substantial byproduct of phosphate fertilizers, as a green building material. With an estimated yearly output of 5 million tons, phosphogypsum poses environmental hazards when discharged as a pollutant. However, inventive ways can offset its negative consequences by reusing waste in a variety 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 tons …

Preparation and Micromechanics of Red Sandstone–Phosphogypsum–Cement

Additionally, the feasibility of producing red sandstone–phosphogypsum–cement composite materials (RS-PG-OPC) using the phosphogypsum (PG)- enhanced volcanic ash activity of RS was investigated. The products of hydration and microstructures of RS-OPC and RS-PG-OPC were analyzed by XRD, FTIR, TG-DTG, and SEM. RS enhanced the flowability of ...

Phosphogypsum recycling: New horizons for a more …

Gregory, Saylak and Ledbetter [13] observed that the use of the mix FA-PG-cement solidified material in road base could present a potential stabilization solution. The stabilizer amount, mix dry density, and phosphogypsum's pH have a major impact on strength development of the stabilized mixes.

Purifying phosphogypsum for cement manufacture

The results of chemical and physical tests and differential thermal analysis of the phosphogypsum with and without the ammonium hydroxide treatment confirmed the efficacy of the treatment for purifying phosphogypsum. The treated phosphogypsum was found to have comparatively smaller amounts of impurities that the untreated material.

Improving geopolymer concrete performance with …

Recycling the hazardous solid waste phosphogypsum (PG) in concrete is a popular trend. However, the inherent properties of PG used alone in concrete tend to limit the strength of the concrete. In this study, PG was used as a precursor for the production of phosphogypsum-based geopolymer concrete (PGC), which effectively improved the …

Efficient removal of phosphate impurities in waste phosphogypsum …

Phosphogypsum (PG) is an industry solid waste produced from phosphoric acid manufacture. To reduce environmental pollution of the PG, H 2 C 2 O 4 was employed to purify it, which then can be used for cement production. The optimal concentration of H 2 C 2 O 4 for PG purification was determined. In addition, differential thermal analysis (DTA), X-ray …

Investigation on Utilization of Phosphogypsum as a …

Phosphogypsum has been used with 3%, 7% and 10% percentages as partially replacement of cement. Results indicated that 10% of PG has improved the setting time, compressive …

Enhancing compressive strength of phosphogypsum-based geopolymer cement

Phosphogypsum (PG) is a bulk industrial solid waste generated during phosphoric acid manufacturing. This study investigated a novel phosphogypsum-based geopolymer (PBG) cement through L 16 (4 5) orthogonal experiments.The impact of five alkaline activators, including Portland cement clinker (PCC), sulfate alumina cement clinker (SACC), aluminate cement …

Treating Waste Phosphogypsum for Cement and Plaster Manufacture

For the sake of effectively reducing the accumulation of phosphogypsum, mixtures were prepared with cement as a curing agent and mass ratios of cement to phosphogypsum of 1:1, 1:2 and 1:3 (low ...

Effect of phosphogypsum on physiochemical and …

This was attributable to the hydration and pozzolanic reactions in the mixture of cement, phosphogypsum, soil and water, which consumed large amount of water. 18, 22 For a given phosphogypsum content, it is evident that the water content significantly decreased with the increase in cement content, which attributed to the larger extent of ...

Production of Beneficiated Phosphogypsum for …

quality of phosphogypsum for use in cement and * Author for correspondence. other applications. Based on the wet sieving of the phosphogypsum, a pilot plant of capacity It/shift has been installed at CBRI and successfully run to make beneficiated phosphogypsum'2. The quality of the phosphogypsum before and after beneficiation and its

Effect of Modified Phosphogypsum on Properties …

The Industrial Waste (phosphogypsum) is a waste product which was produced from the chemical industries. This waste material is used in concrete.

Effect of Phosphogypsum on the Properties of Portland …

The beneficiated phosphogypsum can be used as an additive in place of mineral gypsum in the manufacturing of Portland cement and Portland slag cement. Phosphogypsum …

Phosphogypsum | US EPA

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's regulations require that phosphogypsum be …

Study on the properties of an excess-sulphate phosphogypsum slag cement …

PG is widely used as a building material [12], [13], soil ameliorant [14], and cement binder [15].Excess-sulfate phosphogypsum slag cement (ESPSC) is a low-carbon cementitious material. It comprises 40–50 % PG, 30–40 % granulated blast furnace slag, and a small amount of cement as an activator [16].The ESPSC exhibits excellent later-age …

Production of beneficiated phosphogypsum for cement …

The results favour use of phosphogypsum as an additive to cement clinker in place of natural gypsum. The beneficiation of phosphogypsum procured from two sources was conducted in the pilot plant of 2 t/shift capacity installed at Central Building Research Institute (CBRI) to reduce impurities of phosphates, fluorides, organic matter, alkalies ...

Mechanical Properties and Optimal Mix Design of Phosphogypsum Cement …

The optimal mix proportions for two types of lightweight soil, namely phosphogypsum cement microsilica (PGCF) and phosphogypsum cement slag powder (PGCS), were determined based on single-factor tests. The key parameters considered for optimization were water–binder ratio, content, and phosphogypsum dosage.

Optimization of synergy between cement, slag, and phosphogypsum …

The applicability and characteristics of a cement-slag-phosphogypsum based ternary cement (TC) are investigated for solidifying soft clay to create a crust layer. The strength and load-bearing behaviors of the solidified crust are characterized using unconfined compressive strength (UCS), triaxial compression, and small-scale loading tests.

Phosphogypsum: potential uses and problems – a review

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 investigated.

Phosphogypsum, tropical soil and cement mixtures for asphalt pavements

Phosphogypsum (PG), a by-product of phosphoric acid, is sensitive to the variation in water content. Therefore, this paper aims to investigate the use of hemihydrate PG (HH) mixed with a fine lateritic soil (S) and cement (C) considering the mechanical and durability characteristics in wet and dry cycles.