CAJ | 학술논문

为了查明铝针铁矿含量高的红土型铝土矿拜耳法溶出过程中氧化铝溶出率低的原因,研究针铁矿在溶出过程中的转化规律及其对氧化铝溶出率的影响.结果表明:在溶出温度为110~240℃时,该类型铝土矿中的铝针铁矿基本不发生转化,其中的氧化铝难以溶出;提高溶出温度到260℃或在240℃左右溶出时,添加干矿石量3%的石灰可促使铝针铁矿转化为赤铁矿,且氧化铝的溶出率随着针铁矿转化程度的增加而提高.加入非钙质添加剂也可以促使铝针铁矿在溶出过程发生结构转变,且氧化铝几乎完全参与反应,从而说明此类铝土矿中铝针铁矿在溶出过程中难以转变是红土型铝土矿中氧化铝溶出率低的重要原因.
위료사명려침철광함량고적홍토형려토광배이법용출과정중양화려용출솔저적원인,연구침철광재용출과정중적전화규률급기대양화려용출솔적영향.결과표명:재용출온도위110~240℃시,해류형려토광중적려침철광기본불발생전화,기중적양화려난이용출;제고용출온도도260℃혹재240℃좌우용출시,첨가간광석량3%적석회가촉사려침철광전화위적철광,차양화려적용출솔수착침철광전화정도적증가이제고.가입비개질첨가제야가이촉사려침철광재용출과정발생결구전변,차양화려궤호완전삼여반응,종이설명차류려토광중려침철광재용출과정중난이전변시홍토형려토광중양화려용출솔저적중요원인.
@@@@The transformation law of goethite and its effect on the alumina recovery were investigated in order to determine the reason of low alumina recovery in Bayer digestion process of gibbsitic bauxite with high alumogoethite content. The results show that the goethite present in this kind of bauxite has no obvious change in the digestion temperature range of 110℃to 240℃with low alumina recovery. And alumogoethite can be transformed to hematite by increasing digestion temperature to 260 ℃ or adding lime of 3% of dry ores added at about 240 ℃, and the alumina digestion rate increases with the increase of the goethite conversion degree. Adding non-calcareous additives in the re-digestion process of red mud containing goethite can promote the structure transformation of alumogoethite and thus alumina almost reacts completely. The transition of alumogoethite into other forms in Bayer digestion process is important for alumina recovery for lateritic bauxite.