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Research Article

Tin recovery from a low-grade tin middling with high Si content and low Fe content by reduction-sulfurization roasting with anthracite coal

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  • Received: 27 October 2019Revised: 5 March 2020Accepted: 6 March 2020Available online: 9 March 2020
  • A new method for separating and recovering tin from a low-grade tin middling with high Si content and low Fe content by roasting with anthracite coal was researched by investigating the reaction mechanism and conducting an industrial test, in which the Sn was sulfurized into SnS (g) and then collected using a dust collector. The Fe-Sn alloy can be formed at roasting temperatures over 950°C, and the Sn content and “Sn” activity in this Fe-Sn alloy decrease as the roasting temperature increases. Moreover, more FeS can be formed at higher temperatures and then the formation of FeO-FeS with low melting point is promoted, as a result of which this low-grade tin middling is sintered more seriously. Thus from the viewpoint of thermodynamics and kinetics, the Sn volatilization decreases at excessively high roasting temperatures. The results of the industrial test, which was carried out in a coal-fired rotary kiln, show that the Sn volatilization rate reaches 89.7wt% and the Sn is concentrated at a high level in the collected dust, indicating that the tin can be separated and recovered effectively from the low-grade tin middling with high Si content and low Fe content through a reduction-sulfurization roasting process.
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Tin recovery from a low-grade tin middling with high Si content and low Fe content by reduction-sulfurization roasting with anthracite coal

  • 1. State Key Laboratory of Complex Non-ferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China
  • 2. Engineering Research Center of Metallurgical Energy Conservation and Emission Reduction of Ministry of Education, Kunming University of Science and Technology, Kunming 650093, China
  • 3. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China

Abstract: A new method for separating and recovering tin from a low-grade tin middling with high Si content and low Fe content by roasting with anthracite coal was researched by investigating the reaction mechanism and conducting an industrial test, in which the Sn was sulfurized into SnS (g) and then collected using a dust collector. The Fe-Sn alloy can be formed at roasting temperatures over 950°C, and the Sn content and “Sn” activity in this Fe-Sn alloy decrease as the roasting temperature increases. Moreover, more FeS can be formed at higher temperatures and then the formation of FeO-FeS with low melting point is promoted, as a result of which this low-grade tin middling is sintered more seriously. Thus from the viewpoint of thermodynamics and kinetics, the Sn volatilization decreases at excessively high roasting temperatures. The results of the industrial test, which was carried out in a coal-fired rotary kiln, show that the Sn volatilization rate reaches 89.7wt% and the Sn is concentrated at a high level in the collected dust, indicating that the tin can be separated and recovered effectively from the low-grade tin middling with high Si content and low Fe content through a reduction-sulfurization roasting process.

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