Chemical looping combustion of sulfur paste to SO2 by phosphogypsum oxygen carrier for sulfur acid production

Ma, Jan; Xu, Jianzheng; Liu, Chenhan; Yi, Qun; Zheng, Min; Cheng, Leming; Song, Tao

doi:10.1016/j.fuel.2022.124386

Cited by 17 publications

(3 citation statements)

References 35 publications

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“…In Figure , it is apparent that the new compound, CaSO 4 , was detected at 23° in the reduced red mud . The formation of CaSO 4 could be attributed to the reaction between CaO, one of the alkaline earth metals in red mud, and SO 2 .…”

Section: Resultsmentioning

confidence: 93%

Sulfur Evolution and Capture Behavior by a Solid Waste of Red Mud during Chemical Looping Combustion of Petroleum Coke

Zhang

Liu

et al. 2022

Energy Fuels

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The sulfur evolution behavior during the chemical looping combustion (CLC) process of petroleum coke was investigated in a fluidized bed reactor with a low-cost solid waste of red mud as the oxygen carrier. Effects of temperature, oxygen carrier, and potassium catalyst addition on sulfur release were investigated, and H 2 S oxidization kinetics with the red mud and the effect of elements in the red mud on sulfur conversion were evaluated in detail. The red mud oxygen carrier had a promoting effect on H 2 S generation and thus enhanced sulfur conversion. The addition of potassium remarkably accelerated carbon conversion due to its catalytic effect. Meanwhile, it promoted H 2 generation and then enhanced the generation of H 2 S. The addition of potassium into the process could weaken the release of gaseous sulfur but had no obvious negative influence on the reactivity of the red mud oxygen carrier. The experiment H 2 S interaction with the red mud suggested that the conversion of H 2 S to SO 2 decreased with increasing temperature. The red mud has a low ability to oxidize H 2 S to SO 2 but a high reactivity to capture sulfur-containing gases. Solid sulfur-containing products such as CaSO 4 and Fe 3 S 4 as well as K 2 S 2 in the case of K addition into the process were detected.

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Section: Resultsmentioning

confidence: 93%

Sulfur Evolution and Capture Behavior by a Solid Waste of Red Mud during Chemical Looping Combustion of Petroleum Coke

Zhang

Liu

et al. 2022

Energy Fuels

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“…SO 2 flue gas and cement clinker can be acquired from the process for sulfuric acid and cement based on phosphogypsum by adding lay, bauxite, and coke to the phosphogypsum, followed by calcination in a rotary kiln. The process not only consumes plenty of phosphogypsum waste but also achieves the circulating utilization of sulfur and calcium resources, − which retains practical significance and economic benefits considering the serious sulfur shortage in China . However, this process produces liquid phases at the burning temperature of the clinker, which wraps the phosphogypsum to decrease the decomposition rate and causes ring formation in the rotary kiln .…”

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

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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.

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“…Research [ 13 ] discusses the prospects of using phosphogypsum in road surface production. In studies [ 14 , 15 , 16 , 17 ], it was proposed to use phosphogypsum in chemical ring gasification processes, including synthesis gas production. In addition, developments in the field of extraction of rare earth elements from phosphogypsum are gaining widespread use [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Studying the Process of Phosphogypsum Recycling into a Calcium Sulphide-Based Luminophor

Medennikov,

Egorova,

Shabelskaya

et al. 2024

Nanomaterials

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Currently, one of the most important problems of environmental protection is the deep and complex processing of mineral raw materials. This problem is especially relevant when processing substandard ores and production waste, one of which is phosphogypsum. This study examines the process of CaSO4/CaS composite material formation during the reduction of phosphogypsum with citric acid. The composite structure formation mechanism is proposed. The resulting materials are characterized using various methods, including X-ray diffraction (XRD), transmission electron microscopy, the Scherrer method, thermogravimetric analysis (TGA), and FT-IR spectroscopy. The reduced sample emits orange radiation in the range of 500–750 nm with a quantum yield of 0.17. Experimental results showed that the sample decomposition process in the solid state consisted of two components with a predominant contribution from the long-lived component (~46 ns). The optimal conditions for producing luminescent materials by reducing phosphogypsum with citric acid were determined: a heat treatment temperature of 1073 K, a holding time of 60 min, and a reducing agent mole fraction of 37%. It was found that an increase in temperature with a simultaneous decrease in heat treatment time, as well as a decrease in temperature with a simultaneous increase in heat treatment time, led to a decrease in the luminescent properties of the synthesized material compared to optimal values. The results can be used to develop technology for recycling large-tonnage waste from the chemical industry into luminescent materials.

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Chemical looping combustion of sulfur paste to SO2 by phosphogypsum oxygen carrier for sulfur acid production

Cited by 17 publications

References 35 publications

Sulfur Evolution and Capture Behavior by a Solid Waste of Red Mud during Chemical Looping Combustion of Petroleum Coke

Sulfur Evolution and Capture Behavior by a Solid Waste of Red Mud during Chemical Looping Combustion of Petroleum Coke

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

Studying the Process of Phosphogypsum Recycling into a Calcium Sulphide-Based Luminophor

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