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Zinc ferrite 의 수소 환원에 관한 연구 (1)
박평주 대한금속재료학회(대한금속학회) 1972 대한금속·재료학회지 Vol.10 No.1
Zinc ferrite의 還元 過程을 究明하기 爲하여 zinc ferrite를 水素로 還元시키고, 이때 還元되는 量은 thermal balance로 測定하였다. zinc ferrite는 700∼900℃ 수소압력 30∼55×10^(-3)mmHg 일 때 처음에는 다음과 같이 Fe₃O₄와 Zn(g)로 還元된다. 3ZnFe₂O₄+4H₂=2Fe₃O₄+3Zn+4H₂O. 이 還元反應에 要하는 活性化 energy는 17.4㎉/㏖이다. zinc ferrite를 眞空中에서(10^(-4)mmHg) 700∼950℃로 維持하며 熱分解시키면 Fe₃O₄와 Zn(g)로 分解된다. 이 分解反應이 zinc ferrite還元時의 律速反應이라고 生覺된다. Synthetic zinc ferrite was reduced with hydrogen by the use of thermal balance, in order to understand the course of the reduction. At the initiation of the reaction, zinc ferrite is reduced to Fe₃O₄ and Zn(g) as following equation at 700-900℃ and under 30∼55×10^(-3)mmHg of hydrogen pressure. 3ZnFe₂O₄+4H₂=2Fe₃O₄+3Zn+4H₂O. Activation energy associated with the reaction was determined to be 17.4㎉/㏖. Zinc ferrite decomposes to Fe₃O₄ and Zn(g) at 700∼950℃ under the pressure of 10^(-4)mmHg. And this decomposition process is considered to be a predominant factor in the reduction of zinc ferrite.
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박평주,이응조 대한금속재료학회(대한금속학회) 1966 대한금속·재료학회지 Vol.4 No.2
The reduction of synthetic zinc-ferrite and pure zinc oxide pellets in a stream of 20% H₂and 80% N₂were studied at temperature from 900℃ to 1100℃. The result of the study leads to the conclusion that the reduction rate of ZnO in the zinc-ferrite is slower in the first stage and faster in the second stage than that of pure ZnO. The lagging of the reduction rate of ZnO in the zinc-ferrite in the first stage is caused by the result that almost no reduction of ZnO takes place until iron oxide has been completely reduced to Fe. At temperature of 1100℃, the reduction rate of ZnO in the zinc-ferrite was nearly as high as that of pure ZnO. In this experiment, the activation energy for reduction of pure zinc oxide by H₂gas was 26.8 kcal.
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유동배소로상의 소결융착에 미치는 아연정광중의 Pb, Cu 의 영향에 관한 연구
박평주,백귀종 대한금속재료학회(대한금속학회) 1984 대한금속·재료학회지 Vol.22 No.11
A study on the effect of Pb and Cu in zinc ore is executed for a preventive measures of the fluidized bed agglomeration during the roasting of zinc concentrate. The more the contents of Pb and Cu in zinc concentrate increase, the more the amount of agglomeration increases. Especially, when the contents of Cu in zinc concentrate is over 2.5wt%, the roasting process is very hard. The more the roasting temperature increase, the more the amount cf agglomeration increases during the roasting of the concentrate (Pb 1.5%, Cu 0.7%), and the sorts of compound in agglomerating calcine get to be different. Namely, at 850-950℃, the agglomerating calcine contains ZnO, ZnO·Fe₂O₃,CuSO₄, 2PbO·PbSO₄4PbO·PbSO₄and 2PbO·SiO₂, etc.. At 800℃, 4PbO·PbSO₄is not contained, but at 750℃, ZnO, ZnO·Fe₂O₃, CuSO₄and PbSO₄are contained. When air blowing increases, the agglomeration decreases. In the effect for the change of particle size, when the size decreases, wt.% of bed agglomerating calcine decreases. In these experimental results for the preventive measures of the fluidized bed agglomeration, Pb and Cu in zinc concentrate must decrease less than 0.5%, 0.2% respectively, and air blowing must occasionally increase.
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황산용액중에서 zinc-ferrite 의 용해에 관한 속도론적 고찰
박평주,진영술 대한금속재료학회(대한금속학회) 1976 대한금속·재료학회지 Vol.14 No.4
전해 아연 공장의 침출 잔사와 형성 조건 및 입자 크기가 유사한 zinc-ferrite에 대한 용해 속도를 황산용액 중에서 조사하였다. 사용된 황산의 농도 및 반응 온도의 범위는 각각 1N∼8N과 50℃∼90℃였다. zinc-ferrite의 용해 속도는 계면 화학 반응에 의하여 율속되며, 반응의 초기에 대하여 다음과 같은 반응 속도식을 적용할 수 있다. 1-(1-R)^⅓=kt 용해 반응에 대한 activation energy는 14㎉/㏖이며, zinc-ferrite 외에 다른 성분들을 함유한 아연 공장의 침출 잔사의 용해 속도를 증가시키는 요인은 표면적의 차이, 잔사에서의 표면적의 증대 및 Galvanic effect로 설명된다. A kinetic study on dissolution reaction of zinc-ferrite which has similar conditions to zinc-plant residue, has been made with aqueous sulfuric acid in the concentration range of 1N to 8N and over a temperature range of 50℃ to 90℃. The dissolution reaction is believed to be controlled by interface chemical reaction, and the rate is expressed by the following relation for the initial stage of the reaction in aqueous solution. 1-(1-R)^⅓=kt The activation energy for the dissolution reaction is found to be 14 ㎉/㏖. Studies with zinc-plant residue containing some other components besides zinc-ferrite slow increasing dissolution rate and its important factors were interpreted in terms of the difference of surface area, the increase of reactive site in zinc-plant residue and the Galvanic effect.
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