Water-soluble fluorine detoxification mechanisms of spent potlining incineration in response to calcium compounds

Zhang, Gang; Sun, Guodao; Chen, Zihong; Evrendilek, Fatih; Liu, Jingyong

doi:10.1016/j.envpol.2020.115420

Cited by 17 publications

(5 citation statements)

References 27 publications

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“…Zhang et al, in their work [ 229 ], characterized the mechanisms of the detoxification of water-soluble fluoride in bottom ash and the decomposition of fluorine during the combustion of spent potting material (SPL) in response to four calcium compounds CaSiO 3 , CaO, Ca(OH) 2 , and CaCO 3 , which converted NaF into low toxicity compounds, with a conversion range at the level of 54.24–99.45%.…”

Section: Industrial Waste By-product and Biomass As Fluoride Adsorbentsmentioning

confidence: 99%

Management of Solid Waste Containing Fluoride—A Review

2022

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Technological and economic development have influenced the amount of post-production waste. Post-industrial waste, generated in the most considerable amount, includes, among others, waste related to the mining, metallurgical, and energy industries. Various non-hazardous or hazardous wastes can be used to produce new construction materials after the “solidification/stabilization” processes. They can be used as admixtures or raw materials. However, the production of construction materials from various non-hazardous or hazardous waste materials is still very limited. In our opinion, special attention should be paid to waste containing fluoride, and the reuse of solid waste containing fluoride is a high priority today. Fluoride is one of the few trace elements that has received much attention due to its harmful effects on the environment and human and animal health. In addition to natural sources, industry, which discharges wastewater containing F− ions into surface waters, also increases fluoride concentration in waters and pollutes the environment. Therefore, developing effective and robust technologies to remove fluoride excess from the aquatic environment is becoming extremely important. This review aims to cover a wide variety of procedures that have been used to remove fluoride from drinking water and industrial wastewater. In addition, the ability to absorb fluoride, among others, by industrial by-products, agricultural waste, and biomass materials were reviewed.

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Section: Industrial Waste By-product and Biomass As Fluoride Adsorbentsmentioning

confidence: 99%

Management of Solid Waste Containing Fluoride—A Review

2022

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“…Therefore, no CN – was detected in the leach solution in all the experimental cases. For F – , it also met the environment requirement as the F – content in the leach solution was less than 100 mg·L –1 . Therefore, the byproduct of the reduction–sulfurization smelting process, cleaned slag, is easy to be safely treated and directly landfilled.…”

Section: Resultsmentioning

confidence: 99%

“…For F − , it also met the environment requirement as the F − content in the leach solution was less than 100 mg•L −1 . 42 Therefore, the byproduct of the reduction−sulfurization smelting process, cleaned slag, is easy to be safely treated and directly landfilled. Although, both the leach solutions of the cleaned slag with and without CaO could meet the environmental requirement, the reasons are different.…”

Section: Copper and Cobaltmentioning

confidence: 99%

Recovery of Copper and Cobalt from Converter Slags via Reduction–Sulfurization Smelting Using Spent Pot Lining as the Reductant

Zhao

Hong

et al. 2021

ACS Sustainable Chem. Eng.

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Large amounts of solid wastes are produced in copper and aluminum smelting processes, which not only cause losses of valuable resources but also threaten the ecology and environment. In this study, a reduction−sulfurization smelting method was used for recovering Cu and Co from converter slags by using spent pot lining (SPL) as the reductant. CaO was added to fix the fluorine from SPL into the cleaned slag. Thermodynamic analysis and experiments were performed to verify the feasibility and determine the optimal conditions of this smelting process. The optimum reductant addition of spent cathode carbon block (SCCB) and spent SiC side block (SSCB) was 8−12 wt %, and the copper and cobalt recovery reached more than 98 and 96%, respectively. The addition of 10 wt % CaO for SCCB improved slag viscosity and promoted the separation between slag and matte/alloy and fixed fluorine in the cleaned slag in the form of insoluble calcium fluoride. The metallized Cu−Co matte was obtained, in which Cu mainly existed in the form of sulfide and Co mainly existed in the form of an iron cobalt alloy.

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“…Second, the Ca compounds exerted a significant effect on fluorine retention and the reduction in fluorine emissions [55]. Al 2 O 3 and SiO 2 also played an important role in the fluorine transformations during combustion [56]. As the ash chemical composition shows in Table 2, there is more calcium, silicon, and aluminum than fluorine in the fuels, which could generate fluoride-bearing mineral matters or complex compounds with fluorine, such as CaF 2 •CaO, CaF 2 •CaO•Al 2 O 3 , and CaF 2 •CaO•SiO 2 , and their decomposition temperatures are higher than 1300 • C [54].…”

Section: Hcl and Hf Emissionmentioning

confidence: 99%

Pollutant Emissions and Heavy Metal Migration in Co-Combustion of Sewage Sludge and Coal

Liu,

Yue,

2024

Energies

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The treatment of sewage sludge has become a global concern. Large amounts of sewage sludge can be disposed of by burning coal-mixed sludge. Thermogravimetric analysis and lab-scale combustion experiments in a drop tube furnace were utilized to study the combustion characteristics, pollutant emissions, and heavy metal migration during the co-combustion of coal and sewage sludge. The results showed that the blended fuels with a sewage sludge content less than 10 weight percent exhibited coal-like combustion characteristics. Additionally, the additional sewage sludge favored the ignition performance of blended fuels. When sewage sludge was added, the SO2 emissions rose to 76 mg/Nm3 under the 10% sludge condition—nearly three times higher than that of coal alone. While NOx emissions stayed mostly unchanged, HCl and HF emissions were very low. Meanwhile, Cr, Cu, and Ni migrated to the bottom ash, and their concentrations were all reduced with an increase in sewage sludge. Pb, Cd, Cr, Cu, Ni, and Hg migrated to the flue gas, mostly in the form of gaseous components. The results provide crucial information in the co-combustion of sewage sludge and coal, with implications in the development and improvement of large-scale, harmless, and resource-recovering techniques for waste sludge.

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Water-soluble fluorine detoxification mechanisms of spent potlining incineration in response to calcium compounds

Cited by 17 publications

References 27 publications

Management of Solid Waste Containing Fluoride—A Review

Management of Solid Waste Containing Fluoride—A Review

Recovery of Copper and Cobalt from Converter Slags via Reduction–Sulfurization Smelting Using Spent Pot Lining as the Reductant

Pollutant Emissions and Heavy Metal Migration in Co-Combustion of Sewage Sludge and Coal

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