Rate of Oxidation of Pb, Ni in Liquid Copper by Molten Slags

Shiino, Junichi; Sato, Takashi; Nakashima, Kouichi; Mori, Ken-ichiro

doi:10.2473/shigentosozai.119.564

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…Therefore, from the viewpoints of the improvement of operating condition and decrease of copper loss, the Cu 2 O-based fluxes are significant for the removal of impurities, and some correlative research [3][4][5][6] has been done. Nakamura [1] and Fujisawa et al [3] systematically summarized the effect of Cu 2 O-based flux on the removal of impurities from liquid copper and presented that the impurities such as Sb, Pb, and Ni were difficultly removed.…”

mentioning

confidence: 99%

Removal and Recycling of Antimony from Liquid Copper by Using CuCl-CaO Fluxes at 1423 K

Cui

Matsuura

Hamano

et al. 2007

Metall Mater Trans B

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confidence: 99%

Removal and Recycling of Antimony from Liquid Copper by Using CuCl-CaO Fluxes at 1423 K

Cui

Matsuura

Hamano

et al. 2007

Metall Mater Trans B

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“…In recent years, some researches [3][4][5][6] on the use of Cu 2 O-based fluxes for copper scrap refining have been conducted from the viewpoints of improving operation condition and decreasing copper loss. Nakamura 1) and Fujisawa et al 3) systematically summarized the effect of Cu 2 O-based flux on the removal of impurities from copper scrap, and presented that it is difficult for the impurities such as Sb, Pb and Ni to be removed.…”

Section: Introductionmentioning

confidence: 99%

Removal of Antimony from Liquid Copper by Using CuCl–Na2CO3 Fluxes at 1423 K

et al. 2008

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The removal rate of antimony from liquid copper by using CuCl-Na 2 CO 3 fluxes was measured at 1 423 K with argon gas atmosphere. The addition of Na 2 CO 3 to CuCl flux was relatively effective for the removal of antimony. The concentration of antimony in liquid copper largely decreased with time or with increasing Na 2 CO 3 content in flux. About 99.8 % of antimony was removed from liquid copper during 15 min. The metal weight and oxygen content of metal increased with time and with increasing Na 2 CO 3 content in flux. These behaviors were mainly due to the decomposition of Cu 2 O formed in flux. The antimony in copper was oxidized.According to the mass balance, about 60 % of the removed antimony from liquid copper vaporized from the CuCl-23.8mass%Na 2 CO 3 flux. The chlorination reaction between formed antimony oxide and CuCl might result in the vaporization of antimony from flux.According to the above-mentioned experimental results, the CuCl-Na 2 CO 3 fluxes were effective for the removal and recycling of antimony from liquid copper.KEY WORDS: copper scrap recycling; removal rate; antimony; copper chloride; sodium carbonate; chlorination, vaporization mechanism. 23© 2008 ISIJ tration of Sb in liquid copper largely decreased with time or with increasing CaO content in flux. About 99.9 % of antimony was removed from liquid copper during 15 min for CuCl-25mass%CaO flux. It was also confirmed that a part of antimony vaporized from flux to gas phase. The CuCl-CaO fluxes show high removal efficiency for Sb from liquid copper. Moreover, the mechanisms of removal and recycling of Sb from liquid copper by using CuCl-CaO fluxes were also clarified. The oxidation reaction of Sb in liquid copper controlled the removal rate, and the chlorination reaction between formed Sb 2 O 3 and CuCl resulted in the vaporization of Sb from flux as SbCl 3 and SbOCl.The purpose of this study is the measurement of removal rate of Sb from liquid copper by using CuCl-Na 2 CO 3 fluxes at 1 423 K, which is lower than the conventional copper smelting temperature. The removal rate of antimony was also observed and the vaporization mechanism was discussed. Experimental ProceduresThe Cu-1.05mass%Sb alloy was prepared by melting the high purity copper (99.99 %) and antimony (99.999 %). The CuCl-Na 2 CO 3 fluxes were prepared by mixing the reagent grade CuCl and Na 2 CO 3 . Five grams of the metal sample were used. All CuCl-Na 2 CO 3 fluxes were weighed to be five grams as CuCl-Na 2 O flux.The metal and flux samples were charged in an alumina crucible (outer diameter 21, inner diameter 17 and height 100 mm). After the total weight was measured, the crucible with samples was set in a porous magnesia protection crucible located in the hot zone of the mullite tube in an electric furnace, and this moment was defined as the experiment start time (tϭ0). All experiments were carried out at 1 423 K with dehydrated high purity argon gas (99.999 %) which flow rate was 250 cm 3 /min. After the predetermined experimental time, the sample was quickly taken out...

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“…Mori et al 8,9) examined the effect of the addition of B 2 O 3 on the partition ratio of Pb between the Cu 2 O-B 2 O 3 slag and liquid copper at 1473 K. The partition ratio of Pb increased by the addition of B 2 O 3 to the slag. The maximum value of the partition ratio was 327 when the B 2 O 3 content was 29.8 mass%.…”

Section: Introductionmentioning

confidence: 99%

Partition Equilibria of Lead and Antimony between Liquid Copper and MgO Saturated Cu2O-SiO2, Cu2O-CaO and Cu2O-CaO-SiO2 Systems

Cui

Hamano

et al. 2006

Mater. Trans.

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The partition ratios of Pb and Sb between liquid copper and MgO saturated Cu 2 O-SiO 2 , Cu 2 O-CaO and Cu 2 O-CaO-SiO 2 systems were measured from 1523 to 1673 K.For Cu 2 O-SiO 2 -MgO satd. system at 1573 K, the effect of SiO 2 content on partition ratios of Pb and Sb was small and their partition ratios were lower than 20. For Cu 2 O-CaO-MgO satd. system, the partition ratio of Pb was not affected by the CaO concentration, while the partition ratio of Sb and the activity coefficient of SbO 1:5 were dependent on the CaO concentration. When CaO concentration increased, the partition ratio of Sb increased and the activity coefficient of SbO 1:5 decreased.For Cu 2 O-CaO-SiO 2 -MgO satd. system, two liquid phases, which one was calcium silicate rich phase and another was Cu 2 O rich phase, were observed at 1573 K. The partition ratios of Pb and Sb between calcium silicate phase and liquid copper were dependent on the ratio of (mass%CaO)/(mass%SiO 2 ). When the ratio (mass%CaO)/(mass%SiO 2 ) increased, the partition ratio of Pb decreased and that of Sb increased.

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Rate of Oxidation of Pb, Ni in Liquid Copper by Molten Slags

Cited by 3 publications

References 3 publications

Removal and Recycling of Antimony from Liquid Copper by Using CuCl-CaO Fluxes at 1423 K

Removal and Recycling of Antimony from Liquid Copper by Using CuCl-CaO Fluxes at 1423 K

Removal of Antimony from Liquid Copper by Using CuCl–Na2CO3 Fluxes at 1423 K

Partition Equilibria of Lead and Antimony between Liquid Copper and MgO Saturated Cu<SUB>2</SUB>O-SiO<SUB>2</SUB>, Cu<SUB>2</SUB>O-CaO and Cu<SUB>2</SUB>O-CaO-SiO<SUB>2</SUB> Systems

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