Emission reduction research and development of PCDD/Fs in the iron ore sintering

Qian, Lixin; Chun, Tiejun; Long, Hongming; Li, Jiaxin; Di, Zhanxia; Meng, Qingbang; Wang, Ping

doi:10.1016/j.psep.2018.04.014

Cited by 47 publications

(23 citation statements)

References 70 publications

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“…The inhibition mechanisms of urea have investigated in our previous reports (Long et al, 2011;Qian et al, 2018). The mechanisms can be summed up into three aspects:…”

Section: Inhibition Mechanisms Reduction Emission Mechanism Of Pcdd/fsmentioning

confidence: 99%

“…At present, there are three types of inhibitors, i.e., nitrogen (N)-containing inhibitors, S-containing inhibitors, and alkaline inhibitors. However, due to the negative effect on SO 2 emission levels in the flue gas and quality of sinter, S-containing and alkaline inhibitors were restricted in utilization during the sintering process (Qian et al, 2018). The N-containing inhibitors, especially urea, added in sintering raw mixture have no negative impact on the production process and product quality.…”

Section: Introductionmentioning

confidence: 99%

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Inhibition Behavior of PCDD/Fs Congeners by Addition of N-containing Compound in the Iron Ore Sintering

Wang

Qian

et al. 2020

Aerosol Air Qual. Res.

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PCDD/Fs are typical toxic persistent aromatic compounds that greatly reduce air quality and harm human health. In this study, urea's suppressive effect on PCDD/Fs and their congener emissions was investigated via sintering pot tests, and the inhibition mechanisms were studied. The results showed that the I-TEQ values for the total PCDD/Fs decreased from 0.50 to 0.20, 0.12 and 0.20 ng I-TEQ Nm-3 after adding solid 0.02, 0.035 and 0.05 wt.% urea particles, respectively, to the iron ore sintering mixture, but these values increased for the low-chlorinated TeCDFs (from 0.003 to 0.009, 0.006 and 0.006 ng I-TEQ Nm-3) and TeCDDs (from 0.014 to 0.020, 0.018 and 0.020 ng I-TEQ Nm-3). Moreover, the average I-TEQ values for the chlorine substituents in the PCDFs and PCDDs decreased, indicating that urea inhibited chlorination or enhanced dechlorination. The potential mechanisms by which urea suppresses the total PCDD/Fs and hydrodechlorinates the highchlorinated PCDD/Fs are discussed.

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“…The inhibition mechanisms of urea have investigated in our previous reports (Long et al, 2011;Qian et al, 2018). The mechanisms can be summed up into three aspects:…”

Section: Inhibition Mechanisms Reduction Emission Mechanism Of Pcdd/fsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Inhibition Behavior of PCDD/Fs Congeners by Addition of N-containing Compound in the Iron Ore Sintering

Wang

Qian

et al. 2020

Aerosol Air Qual. Res.

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“…It is mainly generated from a wide range of industrial processes or incineration of municipal and medical wastes. It is said that the iron ore sintering process is one of the largest emission sources [2]. Hence, the stringent environment regulations have been imposed on the emissions from the iron ore sintering process in many countries [3,4].…”

Section: Introductionmentioning

confidence: 99%

Study of Catalytic Combustion of Dioxins on Ce-V-Ti Catalysts Modified by Graphene Oxide in Simulating Iron Ore Sintering Flue Gas

et al. 2019

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Ce-V-Ti and Ce-V-Ti/GO catalysts synthesized by the sol-gel method were used for the catalytic combustion of dioxins at a low temperature under simulating sintering flue gas in this paper. The catalytic mechanism of Ce-V-Ti catalysts modified with graphene oxides (GO) at a low temperature was revealed through X-ray diffractometer (XRD), Brunauer–Emmett–Teller (BET), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), H2-temperature-programmed reduction (H2-TPR) and Fourier transform infrared (FTIR). During the tests, chlorobenzene (CB) was used as a model reagent since the dioxins are poisonous. The results showed that introducing GO to Ce-V-Ti catalysts can improve the specific surface area and promote the CB adsorption on the surface of catalysts. Simultaneously, the Ce-V-Ti with 0.7 wt % GO support showed the high activity with the conversion of 60% at 100 °C and 80% at 150 °C. The adsorb ability of catalysts is strengthened by the electron interaction between GO and CB through π-π bond. In the case of Ce-V-Ti catalysts, Ce played a major catalytic role and V acted as a co-catalytic composition. After GO modification, the concentration of Ce3+ and V4+ were enlarged. The synergy between Ce3+ and V3+ played the critical role on the low-temperature performance of catalysts under sintering flue gas.

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“…The position and number of chlorine atoms surrounding the two benzene rings depict the physical, chemical and toxicological properties of these persistent organic compounds [2]. 2,3,7,8- Tetrachlorodibenzo- p -dioxin (TCDD), is the most toxic congener known to cause extreme toxicological impacts, such as carcinogenicity, teratogenicity, modulation of the immune system and tumour promotion [2, 4, 5]. TCDD is classified as group 1 carcinogen by the International Agency for Research on Cancer (IARC)[6].…”

Section: Introductionmentioning

confidence: 99%

“…Qian et al, (2018) provided an overview of the production mechanism of dioxins and also discussed various measures to reduce dioxin formation during the iron ore sintering process. Three approaches for source control were discussed, including process control and end treatment, that can be adopted to reduce dioxin emissions from iron ore sintering plants [4].…”

Section: Introductionmentioning

confidence: 99%

Application of national pollutant inventories for monitoring trends on dioxin emissions from stationary industrial sources in Australia, Canada and European Union

et al. 2019

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Industrial sources, including iron ore sintering, municipal waste incineration and non-ferrous metal processing have been prominent emitters of dioxins to the environment. With the expanding industrial sectors, many international conventions were established in order to reduce the emission of dioxins in the past two decades. The Stockholm convention, a global monitoring treaty, entered into force in 2004 with the aim to promote development of strategies to reduce or eliminate dioxin emissions. According to the convention, parties are required to develop national inventory databases to report emission levels and develop a national implementation plan (NIP) to reduce further dioxin emissions. In order to understand the trend of dioxin emissions since 1990s this study provides a comparative assessment of dioxin emissions from different industrial sources by deriving emission data from the national inventory databases of Australia, Canada and the 28 European countries (EU-28). According to the data collected, iron and steel production and electricity generation were the highest emitters of dioxins in 2017 for Europe, Canada and Australia, when compared to other stationary industrial sources. The change in the trend of dioxin emissions from the iron and steel industry and the public electricity sector was also assessed. The emission of dioxins during 1990–2017 from both iron and steel production and electricity generation revealed a relative decreasing trend, except for Spain and Italy who showed higher level of emissions from iron and steel production in 2017. Furthermore, comparing emission data for metal production revealed that the blast furnace process was the prominent emitter of dioxins comparing to electric arc furnace process. Further investigation was performed to compare the amount of dioxin emitted from three different fuel types, black coal, brown coal and natural gas, used for electricity generation in Australia. The study showed that dioxin emissions from brown coal were higher than black coal for the last two years, while power production from natural gas emits the lowest amounts of dioxins to the environment.

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Emission reduction research and development of PCDD/Fs in the iron ore sintering

Cited by 47 publications

References 70 publications

Inhibition Behavior of PCDD/Fs Congeners by Addition of N-containing Compound in the Iron Ore Sintering

Inhibition Behavior of PCDD/Fs Congeners by Addition of N-containing Compound in the Iron Ore Sintering

Study of Catalytic Combustion of Dioxins on Ce-V-Ti Catalysts Modified by Graphene Oxide in Simulating Iron Ore Sintering Flue Gas

Application of national pollutant inventories for monitoring trends on dioxin emissions from stationary industrial sources in Australia, Canada and European Union

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