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Sulfide에 의한 액상반응에서 Cu(II)의 침전 특성
Characteristics of Cu(II) Precipitation by the Liquid Phase Reaction with Sulfide
HWAHAK KONGHAK, December 1991, 29(6), 639-645(7), NONE
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Abstract
Sulfide에 의한 액상침전반응에서 Cu(II)분리에 대한 침전 특성을 조사하였다. CuS 입도분석은 Coulter Coun-ter를 사용하였으며 초기 농도 및 pH를 변수로 하여 핵생성과 결정성장 특성에 대하여 실험을 행하였다. 핵생성 속도와 결정성장 속도에 대한 용해도 영향을 검토하였으며 성장기간에서 mixing time에 따른 평균 입경성장속도식을 도출하여 실험결과와 비교하였다. 핵생성 및 결정성장은 각각 고전핵생성 이론 및 two-step 모델로 해석하였으며 핵생성 과정은 반응물 이온농도에 대하여 5차 반응이었고 결정성장 과정은 0.746차 반응이었다. 핵생성에 대한 실험결과로부터 얻은 계면장력은 2.62×10-5J/cm2이었다. CuS 용해도 증가에 따라 핵생성 속도는 감소하고 결정성장 속도는 증가하였으며 CuS 결정의 성장 속도에 관하여 다음과 같은 상관식을 얻었다._x000D_
dr/dt=8.13×10-3(r∞3-r-3)0.746
The characteristics of CuS precipitation, which will be adapted to Cu(II) elimination from waste water, were investigated. A Coulter Counter was used in CuS particle size analysis. The rates of nucleation and growth of CuS were represented by classical nucleation theory and two step model, respectively. The rate of nucleation of copper sulfide from its ions is a fifth-order reaction and the order of the overall growth process is 0.746. The interfacial tension between the CuS particles and the surrounding solution, which has been calculated by uncleation theory and experimental data, is determined to be 2.62×10-5J/cm2. The growth rate of CuS particles can be predicted by the following equation succesfully.
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