아연제련공정 침전물 중 미반응 아연의 자력선별 회수를 위한 니켈 세멘테이션
Ni Cementation Followed by Magnetic Separation for Recovery of Unreacted Zn from by-products of Zn Smelting Process
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초록
아연제련공정 중 코발트 제거를 위해 세멘테이션을 이용한 정액공정을 실시하는데, 이 과정에서 발생하는 침전물은 코발트뿐만 아니라 안티몬, 구리 그리고 아연을 포함한다. 아연은 코발트의 안정적인 제거를 위해 과량 투입 하기 때문에 침전물 중 미반응 상태로 많이 남게 된다. 그러므로 본 연구에서는 미반응 아연을 회수하기 위한 자력선별 연구를 수행하였다. 이를 위해 아연정광 침출 모사액([Zn]=150 g/L, [Sb]=[Co]=10 mg/L, [Cu]=200 mg/L)에 강자성체 인 니켈 성분을 포함시킨 후 아연 분말을 투입하는 세멘테이션을 실시하여 니켈 성분을 포함하는 침전물을 생성시켰 다. 니켈의 초기 농도가 120 mg/L일 경우 자력선별이 불가능하였지만 초기 농도를 240 mg/L로 증가시키고 pH를 3.3-3.7, 온도를 85°C로 유지하며 30분간 세멘테이션을 실시하고 침전물을 자력선별한 경우, 자착물로 53.4% 니켈, 56.7% 구리, 48.2% 코발트, 57.0% 안티몬과 11.9%의 아연을 회수하고 비자착물로 88.1%의 아연을 농축시킬 수 있었다.
Abstract
A purification process using cementation to remove Co ions in the course of Zn metallurgy process generated precipitate containing Cu, Sb, Zn as well as Co. Because an excess amount of Zn is generally added to the cementation process to guarantee the Co removal, this study used a magnetic separation process to recover unreacted Zn powder. Nickel was added to simulated Zn leach solution ([Zn]=150 g/L, [Co]=[Sb]=10 mg/L, [Cu]=200 mg/L) and the precipitate with Ni component was generated by adding Zn powder to the solution. When the concentration of Ni was 120 mg/L, no magnetic separation of the precipitates was observed. In contrast, after the concentration of Ni increased to 240 mg/L, when the cementation test was performed for 30 minutes at 85°C and pH 3.3-3.7, and then precipitates were separated with a magnet, 53.4% Ni, 56.7% Cu, 48.2% Co, 57.0% Sb, and 11.9% Zn were recovered in the magnetic fraction, whereas 88.1% Zn was concentrated in the non-magnetic fraction.
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