침전법에 의한 국내산 자철광으로부터 철 회수
Recovery of Iron from Domestic Magnetite Ore using Selective-Precipitation Process
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초록
국내산 저품위 자철광 원광으로부터 염산과 황산을 침출 용매로 사용한 선택 침전법으로 철을 회수하였다. 자철광 원광을 파쇄, 분쇄 및 체가름으로 이루어진 물리적 처리 방법으로 마그네타이트, 포스테라이트, 디옵사이트를 주성분으로 한 미분체를 얻었다. 이 분말을 0.5 M ~ 2.0 M의 염산과 황산 용액에 용해한 후 암모니아수와 수산화나트륨으로 중화하여 수산화철을 침전시켰다. 염산의 농도가 2.0 M로 증가함에 따라 침전물에 함유된 Fe의 함량이 93%까지 증가하였다. 이때 Fe 이온이 침전될 때 Si 이온은 동시에 침전되었으나 Mg 이온은 침전되지 않고 용액 중에 잔류하였다. 침전물에 함유된 Al, Ca 및 Mn의 양의 합계는 1.0 wt% 이하인 것으로 측정되었다.
Abstract
Iron was recovered from domestic low grade magnetite ore by selective-precipitation process using hydrochloric and sulfuric acids as a leaching agent. Micropowders mainly containing magnetite, forsterite and diopside were obtained by physical separation processes such as crushing, grinding and screening. These powders were dissolved in 0.5 M ~ 2 M HCl or H2SO4 solution and then neutralized to precipitate iron hydroxide with NH4OH and NaOH. As the concentration of hydrochloric acid increased up to 2.0 M, Fe content in the precipitate increased to 93%. While iron ions precipitated together with Si ones, magnesium ions did not co-precipitate. And the total amount of Al, Ca and Mn in the precipitate was estimated to be below 1%.
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