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김성완,김태동,김종련,김종래 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.10
In order to utilize the limestone sludge of limestone calcination plant as a by-product, present study had been performed to estimate the usability of limestone sludge as a raw material of sinter mixture in iron ore sintering process and the influence of addition of limestone slurry and dried limestone sludge on the sintering properties. The results of sintering pot tests showed that limestone sludges might be used in iron ore sintering process in the phase of slurry and dried powder without the deterioration of sinter quality. The optimum density of limestone slurry and ratio of sludge to sinter mixture were 20% and 1.2%, respectively. In the respect of sinter quality, strength(TI) and reduction index(RI) was decreased with the increase of limestone sludge containing dolomite particles due to the decrease of calcium ferrite and the increase of low reducible magnetite of sinter.
인산염 피막 처리에 대한 고분자 첨가제의 영향에 관한 연구
류영철,이근대,이회근,김종래 釜山工業大學校 1995 論文集 Vol.37 No.-
The effect of additive on phosphate coating was investigated. It was shown that the optimum concentration of accelerator is 2g/ℓ. The lower concentration resulted in coarse crystalline coating, whereas higher concentration of accelerator suppressed the reaction. In the case of Ca addition, the Zn/Ca ratio of 6.67 in phosphating solution revealed the highest efficiency in coating process. When polyaniline(PANI) is introduced into phosphating solution, it reduced both coating weight and weight of substrate dissolved during phosphating. The incorporation of PANI in the bath also affected composition and surface tension of phosphate coating. High concentration of PANI resulted in decrease in surface tension and increase in content of Fe in phosphating coating. The electrocoated paint film on PANI-modified phosphated coating showed marked improvement in distensibility compared to that on unmodified phosphated coating.