Behaviour of coal in smelting reduction installation

Usachev, A. B.; Balasanov, A. V.; Lekherzak, V. E.; Роменец, В. А.

doi:10.1179/030192300677732

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…Such restrictions do not apply for nonferrous bath-smelting processes, which makes them appealing for utilization of SRM. For nonferrous processes, in which coal is used as a reductant, it is known that coal contributes to reduction through the gasification reaction of carbon in char [9,10]. However, plastics are known to decompose by low amount of char and high amount of volatiles.…”

Section: Introductionmentioning

confidence: 99%

Alternative Reducing Agents in Metallurgical Processes: Devolatilization of Shredder Residue Materials

Lotfian

Ahmed

Samuelsson

2016

J. Sustain. Metall.

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Plastic-containing shredder residue material has the potential to be used as an alternative reducing agent in nonferrous bath smelting processes. This would lead to not only decreased dependency on primary sources such as coal or coke but also to an increase in the efficiency of utilization of secondary sources. This calls for systematic scientific investigations, wherein these secondary sources are compared with primary sources with respect to devolatilization characteristics, combustion characteristics, reactivity, etc. As a first step, in this paper, devolatilization characteristics of plastic-containing shredder residue material (SRM) are compared to those of coal using thermogravimetric analysis. Proximate analysis has shown that SRM mainly decomposes by release of volatiles, while coal shows high fixed carbon content, which is reported to contribute to reduction reactions. To study the reduction potential of the evolved materials, composition of evolved off-gas was continuously monitored using quadrupole mass spectroscopy. The composition of volatiles shows H 2 , CO, and hydrocarbons which are known to have reduction potential. Therefore, it is essential that SRM would be used in a process that could utilize the evolved volatiles for reduction. Furthermore, to understand the potentials of different plastic materials as reducing agents, the devolatilization mechanisms and volatile composition of three common plastics, namely, polyethylene, polyurethane, and polyvinylchloride and their mixtures have been studied. The results show the interaction between the plastics within the binary and ternary mixtures. Similar phenomena may occur during devolatilization of SRM, which contains different type of plastics.

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Section: Introductionmentioning

confidence: 99%

Alternative Reducing Agents in Metallurgical Processes: Devolatilization of Shredder Residue Materials

Lotfian

Ahmed

Samuelsson

2016

J. Sustain. Metall.

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“…Thermal decomposition of coal and its interaction with the melt in bath-smelting processes are studied [6]. In these processes, pulverized coal is injected alongside air into molten slag.…”

Section: Introductionmentioning

confidence: 99%

Alternative Reducing Agents in Metallurgical Processes: Gasification of Shredder Residue Material

Lotfian

Ahmed

El-Geassy

et al. 2016

J. Sustain. Metall.

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Shredder residue material (SRM) contains plastic material, which has a potential to replace metallurgical coal for reduction during bath-smelting processes. Among the important parameters affecting its implementation are the gasification and the reactivity of char. Therefore, prior to considering its application in metallurgical processes, the gasification characteristics of the produced char need to be studied. Although the char produced from SRM contains lower fixed carbon compared with coal char, it has a porous structure and high surface area, which makes it highly reactive during gasification experiments. In addition to physiochemical properties, the catalytic effect of ash content of SRM char is attributed to its higher reactivity and lower activation energy compared with coal char. Furthermore, the effect of devolatilization heating rate on the gasification characteristics of produced char is investigated. It was found that the devolatilization heating rate during char production has a considerable effect on morphological properties of the char product. Moreover, the gasification reactivity of char produced at a fast devolatilization heating rate was the highest, due to the less crystalline structure of the produced char. Keywords Shredder residue material Á Char Á Gasification Á Reducing agent Á Bath smelting List of Symbols X Char conversion w 0 Initial weight of char w ? Saturation value of the weight-loss curve w(t) Sample weight at a time t r Gasification rate of the isothermal gasification q Gasification rate of the nonisothermal gasification E a Activation energy A Preexponential factor R S Reactivity index s 50 Time (in minute) required to reach the carbon conversion of 50 % w C Weight of carbon in the sample remaining unreacted at the time t The contributing editor for this article was Veena Sahajwalla.

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Behaviour of coal in smelting reduction installation

Cited by 2 publications

References 2 publications

Alternative Reducing Agents in Metallurgical Processes: Devolatilization of Shredder Residue Materials

Alternative Reducing Agents in Metallurgical Processes: Devolatilization of Shredder Residue Materials

Alternative Reducing Agents in Metallurgical Processes: Gasification of Shredder Residue Material

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