Wet process for smelting nickel oxide ore
A process for smelting that can attain a high leaching ratio of nickel and cobalt and a high oxidation ratio of iron to trivalent iron, and, at the same time, can reduce energy cost by suppressing the amount of high-pressure air to be used as an oxidant and the amount of high-pressure steam to be us...
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| creator | YOSHIMOTO OZAKI OSAMU NAKAI KEISUKE SHIBAYAMA |
| description | A process for smelting that can attain a high leaching ratio of nickel and cobalt and a high oxidation ratio of iron to trivalent iron, and, at the same time, can reduce energy cost by suppressing the amount of high-pressure air to be used as an oxidant and the amount of high-pressure steam to be used for maintaining temperature. In a smelting method comprising a first step for slurrying nickel oxide ore and a second step for adding sulfuric acid to the ore slurry and leaching the ore slurry while blowing high-pressure air and high-pressure steam therein, characterized by adjusting the carbon grade in a solid content of ore slurry so as to be 0.1 to 0.5% by mass depending on the blending ratio of the nickel oxide ore that constitutes the ore slurry in the first step and controlling oxidation-reduction potential (Ag/AgCl basis) of the leachate to 400 to 600 mV by adjusting the amount of the high-pressure air to be blown so as to be 700 to 800 Nm3 per ton of carbon in a solid content of ore slurry in the second step. |
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In a smelting method comprising a first step for slurrying nickel oxide ore and a second step for adding sulfuric acid to the ore slurry and leaching the ore slurry while blowing high-pressure air and high-pressure steam therein, characterized by adjusting the carbon grade in a solid content of ore slurry so as to be 0.1 to 0.5% by mass depending on the blending ratio of the nickel oxide ore that constitutes the ore slurry in the first step and controlling oxidation-reduction potential (Ag/AgCl basis) of the leachate to 400 to 600 mV by adjusting the amount of the high-pressure air to be blown so as to be 700 to 800 Nm3 per ton of carbon in a solid content of ore slurry in the second step.</description><language>eng</language><subject>CHEMISTRY ; FERROUS OR NON-FERROUS ALLOYS ; METALLURGY ; PRETREATMENT OF RAW MATERIALS ; PRODUCTION AND REFINING OF METALS ; TREATMENT OF ALLOYS OR NON-FERROUS METALS</subject><creationdate>2009</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20090910&DB=EPODOC&CC=AU&NR=2009200714A1$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,776,881,25542,76290</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20090910&DB=EPODOC&CC=AU&NR=2009200714A1$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>YOSHIMOTO OZAKI</creatorcontrib><creatorcontrib>OSAMU NAKAI</creatorcontrib><creatorcontrib>KEISUKE SHIBAYAMA</creatorcontrib><title>Wet process for smelting nickel oxide ore</title><description>A process for smelting that can attain a high leaching ratio of nickel and cobalt and a high oxidation ratio of iron to trivalent iron, and, at the same time, can reduce energy cost by suppressing the amount of high-pressure air to be used as an oxidant and the amount of high-pressure steam to be used for maintaining temperature. 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| subjects | CHEMISTRY FERROUS OR NON-FERROUS ALLOYS METALLURGY PRETREATMENT OF RAW MATERIALS PRODUCTION AND REFINING OF METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS |
| title | Wet process for smelting nickel oxide ore |
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