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복염에 (複鹽) 의한 청도주물의 (靑銅鑄物) 탈린에 (脫燐) 관한 연구
이성용,황용길,최창옥 ( Sung Yong Lee,Yong Kil Whang,Chang Ok Choi ) 한국주조공학회 1984 한국주조공학회지 Vol.4 No.3
This study has been carried out to investigate into the dephosphorization by using fluxes containing Na₂CO₃-CaF₂-Na₂B₄O_7., l0H₂O and CaO-CaF₂-Na₂B₄O_7. 10H₂O system in molten bronze alloy. The dephosphorization degree of about 80% and 70% were obtained by Na₂CO₃-CaF₂-Na₂B₄O_7. 10H₂O and CaO-CaF₂-Na₂B₄O_7. 10H₂O system, respectively. When the contents of phosphorous in the molten bronze alloy were kept constant, although the amounts of fluxes exceed a given amount, it showed to give little effect in the degree of dephosphorization. The effects of dephosphorization in the molten bronze alloy was increased proportionally with increasing the contents of both phosphorous and amounts of fluxes. The slag formed from the Na₂CO₃-CaF₂-Na₂B₄O_7. 10H₂O system was found to be NaCaPO₄, Na₄P₂O_7 and NaF. The slag of CaO-CaF₂-Na₂B₄O_7. 10H₂O system was composed of Ca_5F (PO₄)3, CaO and CaF₂.
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陸承柱,李相和,崔昌鈺,黃龍吉 동아대학교 공과대학 부설 한국자원개발연구소 1982 硏究報告 Vol.6 No.2
This study is to find out the complex compounds formed when bismuth oxide(Bi₂O₃) and molybdenum trioxide (MoO₃) are mixed at theoretical mole ratios and the condition of the selective reduction of the complex compounds reacted at various temperatures with the active carbon as a reducing element. The results obtained from the alkali leaching conducted under the condition of selective reduction are summarized as follows; 1. The reaction products obtained by mixing Bi₂O₃ and MoO₃ with a mole ratio of 2 to 1 and heating the mixture at 500℃ have found to be Bi₂MoO_(6), Bi₄MoO_(6) and α-Bi₂O₃ whereas at the temperature between 670℃ and 950℃ the main product has been identified to be Bi₄MoO_(9) according to the following reaction: Bi₂O_(6)+α-Bi₂O₃→Bi₄MoO_(9) 2. When the complex compound Bi₄MoO_(9) is reduced for alkali leaching, the optimum amount of carbon and the optimum temperature have been shown to be 4 moles and 800℃, respectively, due to the fact that the maximum reduction rate can be obtained under these optimum conditions. 3. The previous experimental result showed that the alkali leaching ratio of Bi₄MoO_(9) was decreased under atmospheric pressure. However, the alkali leaching of MoO₃ has been found to occur due to the selective reduction of Bi that takes place with more than 4 moles of carbon used as a reducing element at a temperature be tween 600℃ and 900℃ by the following reactions: Bi₄MoO_(9)+6C→4Bi+MoO₃+6CO 2Bi₄MoO_(9)+7C→8Bi+2MoO₂+7CO₂ 4. The comparison analysis for the leaching effect of NaoH and Na₂CO₃ has shown that in the case of using over 4 moles of carbon as a reducing element the leaching rate of NaOH is much higher than that of Na₂CO₃.
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