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화학처리공정에 의한 휘수연삼선정광의 실수율 향상에 관하여
이상내 한국화학공학회 1967 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.5 No.4
The flotation product of Bi-Semi-Concentrate containing 15% of Bi(sulfide form) and 40% of Mo(mostly as sulfide) was roasted in a Herreshoff roaster. Under the maximum temperature of 1,000℉, the concentrate was roasted without sintering phenomena. The charge of 3 ㎏ required 6-8 hrs of roasting. Practically all the molybdenite was converted to MoO₃. Roasted are was treated by the 1.5N-NaOH solution for 3-4 hrs, at 60-80℃. Na₂MoO₄ soln. contg. Mo^(+6) was filtered from the insol. residue contg. SiO₂, CuO, Bi₂O₃, Fe₂O₃. The ppt. was treated in smelter at 1,200℃ and crude Bi (97% Bi) was produced and then refined by S treatment, zincing, chlorination and aeration. Final Bi metal was 99.99% pure and over-all recovery of Bi was 90%. Na₂MoO₄ soln. was acidified by HCl to pH 2.5 and in this soln., Mo is pptd., as ammonium-sodium-polymolybdate with NH₄Cl. It was refined with 7%o NH₄Cl soln., and calcined to MoO₃. The purity of final product was 99.97% MoO₃ and the recovery of it was 85%.
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李相來 忠州大學校 1978 한국교통대학교 논문집 Vol.11 No.2
The rise time response of a pulse transfcrmer is important in the power control system This paper note that in order for the output to rise rapidly, the leakage inductance and the shunt Capacitance must be kept small. The rise time may al so be reduced by reducing a small ualve of will result in a highly at tenuated cutput uoltage.
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