Recycling pre-oxidized chromite fines in the oxidative sintered pellet production process
The chromium (Cr) content of stainless steel originates from recycled scrap and/or ferrochrome (FeCr), which is produced mainly by the carbothermic reduction of chromite ore. The oxidative sintered pellet production process is one of the most widely applied FeCr processes. The supplier of this techn...
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| Veröffentlicht in: | Journal of the South African Institute of Mining and Metallurgy 2019-02, Vol.119 (2), p.207 |
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| container_title | Journal of the South African Institute of Mining and Metallurgy |
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| creator | du Preez, S.P. Beukes, J.P. Paktunc, D. van Zyl, P.G. Jordaan, A. |
| description | The chromium (Cr) content of stainless steel originates from recycled scrap and/or ferrochrome (FeCr), which is produced mainly by the carbothermic reduction of chromite ore. The oxidative sintered pellet production process is one of the most widely applied FeCr processes. The supplier of this technology specifies that recycling of chromite-containing dust collected from the pellet sintering off-gas and fines screened out from the sintered pellets (collectively referred to as pre-oxidized chromite fines) should be limited to a maximum of 4 wt% of the total pellet composition. However, the results presented in this paper suggest that recycling of such fines up to a limit of 32 wt% of the total pellet composition may improve the compressive and abrasion strengths of the cured pellet. In addition, electron microprobe and quantitative X-ray diffraction (XRD) analyses demonstrate that chromite grains present in the pre-oxidized chromite fines consist, at least partially, of crystalline phases/compounds that will improve the metallurgical efficiency and specific electricity consumption (i.e. MWh/ton FeCr produced) of the smelting process. |
| doi_str_mv | 10.17159/2411-9717/2019/v119n2a13 |
| format | Article |
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The oxidative sintered pellet production process is one of the most widely applied FeCr processes. The supplier of this technology specifies that recycling of chromite-containing dust collected from the pellet sintering off-gas and fines screened out from the sintered pellets (collectively referred to as pre-oxidized chromite fines) should be limited to a maximum of 4 wt% of the total pellet composition. However, the results presented in this paper suggest that recycling of such fines up to a limit of 32 wt% of the total pellet composition may improve the compressive and abrasion strengths of the cured pellet. In addition, electron microprobe and quantitative X-ray diffraction (XRD) analyses demonstrate that chromite grains present in the pre-oxidized chromite fines consist, at least partially, of crystalline phases/compounds that will improve the metallurgical efficiency and specific electricity consumption (i.e. MWh/ton FeCr produced) of the smelting process.</description><identifier>ISSN: 2225-6253</identifier><identifier>ISSN: 0038-223X</identifier><identifier>EISSN: 2411-9717</identifier><identifier>DOI: 10.17159/2411-9717/2019/v119n2a13</identifier><language>eng</language><publisher>Johannesburg: South African Institute of Mining and Metallurgy</publisher><subject>Abrasion ; Carbothermic reactions ; Chromite ; Chromium ; Composition ; Dust control ; Electricity consumption ; Electron probes ; Metal scrap ; Metallurgy ; Recycling ; Sintering ; Smelting ; Stainless steels ; Steel scrap ; X-ray diffraction</subject><ispartof>Journal of the South African Institute of Mining and Metallurgy, 2019-02, Vol.119 (2), p.207</ispartof><rights>Copyright South African Institute of Mining and Metallurgy Feb 2019</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c416t-79b40e2ee60cf1b388535c678751cbc1a6f22270c407698c1ad332bc9351aace3</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,864,27924,27925</link.rule.ids></links><search><creatorcontrib>du Preez, S.P.</creatorcontrib><creatorcontrib>Beukes, J.P.</creatorcontrib><creatorcontrib>Paktunc, D.</creatorcontrib><creatorcontrib>van Zyl, P.G.</creatorcontrib><creatorcontrib>Jordaan, A.</creatorcontrib><title>Recycling pre-oxidized chromite fines in the oxidative sintered pellet production process</title><title>Journal of the South African Institute of Mining and Metallurgy</title><description>The chromium (Cr) content of stainless steel originates from recycled scrap and/or ferrochrome (FeCr), which is produced mainly by the carbothermic reduction of chromite ore. The oxidative sintered pellet production process is one of the most widely applied FeCr processes. The supplier of this technology specifies that recycling of chromite-containing dust collected from the pellet sintering off-gas and fines screened out from the sintered pellets (collectively referred to as pre-oxidized chromite fines) should be limited to a maximum of 4 wt% of the total pellet composition. However, the results presented in this paper suggest that recycling of such fines up to a limit of 32 wt% of the total pellet composition may improve the compressive and abrasion strengths of the cured pellet. In addition, electron microprobe and quantitative X-ray diffraction (XRD) analyses demonstrate that chromite grains present in the pre-oxidized chromite fines consist, at least partially, of crystalline phases/compounds that will improve the metallurgical efficiency and specific electricity consumption (i.e. MWh/ton FeCr produced) of the smelting process.</description><subject>Abrasion</subject><subject>Carbothermic reactions</subject><subject>Chromite</subject><subject>Chromium</subject><subject>Composition</subject><subject>Dust control</subject><subject>Electricity consumption</subject><subject>Electron probes</subject><subject>Metal scrap</subject><subject>Metallurgy</subject><subject>Recycling</subject><subject>Sintering</subject><subject>Smelting</subject><subject>Stainless steels</subject><subject>Steel scrap</subject><subject>X-ray diffraction</subject><issn>2225-6253</issn><issn>0038-223X</issn><issn>2411-9717</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNo9kE9LAzEQxYMoWGq_Q8Tz2kyym2yOUvwHBUH04CnsZmdtyna3JmmxfnqzVnqax8ybecOPkGtgt6Cg0HOeA2RagZpzBnq-B9A9r0CckclpdJ4050UmeSEuySyENWOM81zmSk3Ixyvag-1c_0m3HrPh2zXuBxtqV37YuIi0dT0G6noaV0jHcRXdHmlwfUSfjFvsOoxpeWh2NrqhH6XFEK7IRVt1AWf_dUreH-7fFk_Z8uXxeXG3zGwOMmZK1zlDjiiZbaEWZVmIwkpVqgJsbaGSbXpfMZszJXWZGo0QvLZaFFBVFsWU3BzvptyvHYZo1sPO9ynScM640lwLmVz66LJ-CMFja7bebSp_MMDMH0wzEjMjMTPCNCeY4hfa32l6</recordid><startdate>20190201</startdate><enddate>20190201</enddate><creator>du Preez, S.P.</creator><creator>Beukes, J.P.</creator><creator>Paktunc, D.</creator><creator>van Zyl, P.G.</creator><creator>Jordaan, A.</creator><general>South African Institute of Mining and Metallurgy</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8BQ</scope><scope>8FD</scope><scope>FR3</scope><scope>JG9</scope><scope>KR7</scope></search><sort><creationdate>20190201</creationdate><title>Recycling pre-oxidized chromite fines in the oxidative sintered pellet production process</title><author>du Preez, S.P. ; Beukes, J.P. ; Paktunc, D. ; van Zyl, P.G. ; Jordaan, A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c416t-79b40e2ee60cf1b388535c678751cbc1a6f22270c407698c1ad332bc9351aace3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Abrasion</topic><topic>Carbothermic reactions</topic><topic>Chromite</topic><topic>Chromium</topic><topic>Composition</topic><topic>Dust control</topic><topic>Electricity consumption</topic><topic>Electron probes</topic><topic>Metal scrap</topic><topic>Metallurgy</topic><topic>Recycling</topic><topic>Sintering</topic><topic>Smelting</topic><topic>Stainless steels</topic><topic>Steel scrap</topic><topic>X-ray diffraction</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>du Preez, S.P.</creatorcontrib><creatorcontrib>Beukes, J.P.</creatorcontrib><creatorcontrib>Paktunc, D.</creatorcontrib><creatorcontrib>van Zyl, P.G.</creatorcontrib><creatorcontrib>Jordaan, A.</creatorcontrib><collection>CrossRef</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Materials Research Database</collection><collection>Civil Engineering Abstracts</collection><jtitle>Journal of the South African Institute of Mining and Metallurgy</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>du Preez, S.P.</au><au>Beukes, J.P.</au><au>Paktunc, D.</au><au>van Zyl, P.G.</au><au>Jordaan, A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Recycling pre-oxidized chromite fines in the oxidative sintered pellet production process</atitle><jtitle>Journal of the South African Institute of Mining and Metallurgy</jtitle><date>2019-02-01</date><risdate>2019</risdate><volume>119</volume><issue>2</issue><spage>207</spage><pages>207-</pages><issn>2225-6253</issn><issn>0038-223X</issn><eissn>2411-9717</eissn><abstract>The chromium (Cr) content of stainless steel originates from recycled scrap and/or ferrochrome (FeCr), which is produced mainly by the carbothermic reduction of chromite ore. The oxidative sintered pellet production process is one of the most widely applied FeCr processes. The supplier of this technology specifies that recycling of chromite-containing dust collected from the pellet sintering off-gas and fines screened out from the sintered pellets (collectively referred to as pre-oxidized chromite fines) should be limited to a maximum of 4 wt% of the total pellet composition. However, the results presented in this paper suggest that recycling of such fines up to a limit of 32 wt% of the total pellet composition may improve the compressive and abrasion strengths of the cured pellet. In addition, electron microprobe and quantitative X-ray diffraction (XRD) analyses demonstrate that chromite grains present in the pre-oxidized chromite fines consist, at least partially, of crystalline phases/compounds that will improve the metallurgical efficiency and specific electricity consumption (i.e. MWh/ton FeCr produced) of the smelting process.</abstract><cop>Johannesburg</cop><pub>South African Institute of Mining and Metallurgy</pub><doi>10.17159/2411-9717/2019/v119n2a13</doi><oa>free_for_read</oa></addata></record> |
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| source | DOAJ Directory of Open Access Journals; EZB-FREE-00999 freely available EZB journals |
| subjects | Abrasion Carbothermic reactions Chromite Chromium Composition Dust control Electricity consumption Electron probes Metal scrap Metallurgy Recycling Sintering Smelting Stainless steels Steel scrap X-ray diffraction |
| title | Recycling pre-oxidized chromite fines in the oxidative sintered pellet production process |
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