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蔡泳培 건국대학교 1986 論文集 Vol.23 No.1
An experimental investigation of the heat transfer from mechanically agitated gas-liquid dispersions to a helical heating coil has been carry out. Experiments were performed in a flat bottom cylindrical tank (Dt=30cm) with a six-flat blade turbine Impeller (Di=10cm) and loop type nozzle sparger (do=0.1cm, Dn=8, loop height =4Hi/5). Heat transfer coefficients in aerated stirred tank were measured over range of superficial gas velocity (4.7×10-3≤Vs≤1.89) and impeller speed (100≤rpm≤900). An analysis of the experimental results observed that heat transfer coefficients were increased as well as decreased with the impller speeds and superficial gas velocities. But, above the critical impeller speed, air sparging decreased the heat transfer coefficients.
채영배,정수복,윤평란 한국자원리싸이클링학회 1999 資源 리싸이클링 Vol.8 No.3
오래전에 가행되었던 일부 금 광산에서 폐기된 광미엔는 미회수돈 금 및 시리카 등의 유가광물을 함유하고 있는 것으로 알려져 있으므로, 이들의 유가자원을 회수하기 위한 분리특성을 검토하였다. 처리공정은 가능한 경제성 확보를 위하여, 분급, 자력선별 및 비중선별 등 단순한 분리 공정을 적용하였으며, 본 공정에 으히ㅏ여 부리 회수된 유가지원으로는 금 농축 정광 0.87wt%[금 함유량 307.7 g/ton(0.6.wt%), 97.7 g/ton(0.27wt%)와 Sio$_2$ 품위가 96.40wt% 인 고품위 실리카를 60.65 Wt% 회수 할 수 있었다. 본 연구의 경과는 광산 폐기물 중에서 유가자원을 회수하거나 광산폐기물의 무해화 및 감량화를 목적으로 하는 공정수립에 참고자료가 될 수 있을 것이다. Ths sludy was canied out to recover gold and sllics from abandoned gold mine talings with about 4.5 ghonAu and 84.88 wt% SOz. Tl~bee nef~cialiop~ro~c esses including crushing, screening, magnelic and gravity (humprey sp~rals,h aking table) separation \ulcornervex employed. Results were Feasible to rccovn h e gold concentrates (307.1 gltoilon .4u . 0.60 wr%, 97.7 giton Au : 0.27 wl%, 15.3 &/ton Au . 5.23 wt%, 21.2 g/ton Au : 2.42 wl%) and silica (96.40 wi% SiO\ulcorner yield 60 65 ~ 1 % )
채영배 건국대학교 1984 論文集 Vol.19 No.1
A study on heat transfer in a cylindrical tank as a function of aeration numbers during aeration and stirring was carried out. Experiments were performed in a flat bottom cylindrical tank (Dt = 30cm) with a six blade flat blade turbine impeller (Di = 10cm) and loop type nozzle (DL = 8 cm, loop height=4 Hi/, Nn = 8, nozzle diameter = 0.1 cm). Heat transfer coefficients in aerated stirred tank were measured over range of aeration number between 2×10-3 and 5×10-1 in order to examine the effect of aeration. In the experiment, Reynolds number was a range between 8.5 × 103 and 5.6 × 105. Heat transfer correlation obtained in these conditions can be expressed as follows ; NNU = 22.8(NRe)0.659(NPr)1/3(Vis)0.14(Pa/Ph)-0.79(NA)0.28