Effect of potassium feldspar on the decomposition rate of phosphogypsum

Lu, Dinghui; Chen, Qianlin; Li, Cuiqin; Gong, Shang

doi:10.1002/jctb.6549

Cited by 18 publications

(5 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This result is explained as follows: as the particle size of PG increases, the gap rate between the particles also increases, and a part of the gas escapes from the gaps among the particles or overflows in advance, weakening the contact efficiency of the effective reducing gas produced by coal pyrolysis and gasification with PG. Meanwhile, the formation of Ca 2 (SiO 4 ) eutectic reduces the PG decomposition rate and the target product yields (CaO and SO 2 ). , Therefore, the optimal PG particle size range in this study is 0.27–0.55 mm; the undecomposed CaSO 4 and Ca 2 (SiO 4 ) eutectic contents are the least for this range.…”

Section: Resultsmentioning

confidence: 76%

See 1 more Smart Citation

Reaction Characteristics of Calcination and Decomposition of Phosphogypsum in a Bubbling Fluidized Bed

Yuan,

Li,

et al. 2024

ACS Omega

View full text Add to dashboard Cite

A bubbling fluidized bed reactor is designed to investigate the high-temperature calcination and decomposition characteristics of phosphogypsum (PG). The reactor employs electric heating, and a lifting discharge tube is installed in the middle of the air distributor to allow flexible switching between batch and continuous feeding modes. The batch test results show that the solid-phase bed materials with a PG particle size of 0.27− 0.55 mm and a coal particle size of 0.55−0.83 mm are found to have uniformly mixed at a PG/coal mass ratio of 5:1 and calcined at a high temperature of 1100 °C for 30 min. PG completely decomposes to yield mainly CaS and a small amount of Ca 2 (SiO 4 ) as the solid-phase products. For the above-mentioned optimal process parameters, a 120 min thermal-state continuous test is conducted. Feeding and discharging are performed at intervals of 30 min to maintain the stability of the static bed height inside the reactor. The results indicate that the PG decomposition rate is higher than 92% in the batch and continuous tests. However, the continuous decomposition of PG has significant process advantages, such as a higher CaS yield (71.20%) compared to that in the batch mode (64.49%). Furthermore, PG undergoes agglomeration and bonding within the particles when heated, intensifying the formation of a Ca 2 (SiO 4 ) eutectic.

show abstract

Section: Resultsmentioning

confidence: 76%

“…Meanwhile, the formation of Ca 2 (SiO 4 ) eutectic reduces the PG decomposition rate and the target product yields (CaO and SO 2 ). 4,25 Therefore, the optimal PG particle size range in this study is 0.27−0.55 mm; the undecomposed CaSO 4 and Ca 2 (SiO 4 ) eutectic contents are the least for this range.…”

Section: Bubbling Fluidized Bed Reaction Unitmentioning

confidence: 87%

Reaction Characteristics of Calcination and Decomposition of Phosphogypsum in a Bubbling Fluidized Bed

Yuan,

Li,

et al. 2024

ACS Omega

View full text Add to dashboard Cite

show abstract

“…As a result, the decomposition rate of S1 is higher than that of S2. As illustrated in Figure 4b, the diffraction peaks of CaSO 4 gradually weaken and the diffraction peaks of CaS and Ca 2 SiO 4 22,28 gradually increase with the increase in n C /n CaSO 4 . When the molar ratio of n C / n CaSO 4 is 2.0, a large amount of CaS and a small amount of CaO are present in the solid product due to the formation of the strongly reducing atmosphere.…”

Section: Resultsmentioning

confidence: 92%

Study on the Effect of the Activity of Anthracite on the Decomposition of Phosphogypsum

Liang

Yang

et al. 2022

Ind. Eng. Chem. Res.

Self Cite

View full text Add to dashboard Cite

In this paper, a thermogravimetric analyzer with Fourier transform infrared spectroscopy (TG-FTIR), pyrolysis device and gas chromatography (Py-GC), and kinetic models were used to study the effect of anthracite with different activities on the decomposition of phosphogypsum (PG) and the reaction mechanism was analyzed. The results show that the decomposition rate of PG is affected by the CO partial pressure and the thickness of the decomposition product layer, and the high-activity anthracite has a high decomposition rate of PG. It mainly contains CO, CO 2 , and SO 2 in the decomposition process, while the solid products are mainly CaS, CaO, and Ca 2 SiO 4 . According to the kinetic calculation results at 800−1100 °C, it can be divided into three stages, namely, the one-dimensional diffusion model based on the solid−solid reaction, the two-dimensional diffusion based on the gas−solid reaction model, and the nucleation and growth model of CaO.

show abstract

“…Additives were added to increase the melting characteristics of the material to avoid kiln ringing during the firing of the cement clinker. Kaolin and potassium feldspar increase the molten temperature during the reduction of phosphogypsum to avoid sintering . However, eradicating the liquid phase completely is difficult owing to the material complexity at the cement clinker firing temperature during actual production.…”

Section: Introductionmentioning

confidence: 99%

“…Kaolin and potassium feldspar increase the molten temperature during the reduction of phosphogypsum to avoid sintering. 28 However, eradicating the liquid phase completely is difficult owing to the material complexity at the cement clinker firing temperature during actual production.…”

Section: Introductionmentioning

confidence: 99%

Process Optimization and Mechanism Study for Sulfur Recovery from High-Silica Phosphogypsum via Carbothermal Reduction Smelting

Wang,

Hou,

et al. 2024

ACS Omega

View full text Add to dashboard Cite

Phosphogypsum produced from wet-processed phosphoric acid mainly consists of calcium sulfate dihydrate, which is an important sulfur resource. The traditional sulfuric acid and cement process based on phosphogypsum suffers from unstable cement quality owing to impurities such as phosphorus and fluorine and kiln ringing caused by the low-melting phase. This study investigated sulfur recovery and value-added utilization of liquid slag from high-silica phosphogypsum via carbothermal reduction smelting. A phosphogypsum ingredient (PGI) system was constructed by adding appropriate amounts of silica, alumina, magnesium oxides, and iron oxides to meet the production requirements of slag wool. Carbothermal reduction smelting experiments suggested that the temperature and C/S molar ratio significantly affected the desulfurization rate and phase structure of the slag. More than 97.44 wt % of sulfur could be recovered with a C/S molar ratio of 0.5−0.8 at 1300 °C or above in the molten state, and the molten slag was an amorphous magnesium−calcium−aluminosilicate. The PGI desulfurization mechanism is discussed based on the phase transformation and slag microstructure evolution.

show abstract

Effect of potassium feldspar on the decomposition rate of phosphogypsum

Cited by 18 publications

References 36 publications

Reaction Characteristics of Calcination and Decomposition of Phosphogypsum in a Bubbling Fluidized Bed

Reaction Characteristics of Calcination and Decomposition of Phosphogypsum in a Bubbling Fluidized Bed

Study on the Effect of the Activity of Anthracite on the Decomposition of Phosphogypsum

Process Optimization and Mechanism Study for Sulfur Recovery from High-Silica Phosphogypsum via Carbothermal Reduction Smelting

Contact Info

Product

Resources

About