CAJ | 학술논문

研究了在高温高压条件下用高浓度N aO H溶液从大洋多金属结核中浸出硅 ,考察了反应温度、浸出时间、NaO H初始质量浓度、液固体积质量比对SiO2 浸出率的影响 ,探究了碱浸脱硅动力学.试验结果表明 :大洋多金属结核碱浸脱硅反应的表观活化能为44 .31 kJ/mol ,浸出反应遵循化学反应控制的粒径缩小收缩核模型 ;在170 ℃ 、NaO H初始质量浓度480 g/L、液固体积质量比4:1条件下反应180 min ,SiO2 浸出率达81 .5% .该方法可避免物理选矿环节且无废渣产生,为大洋多金属结核清洁生产提供了一条可供选择的新途径.
연구료재고온고압조건하용고농도N aO H용액종대양다금속결핵중침출규 ,고찰료반응온도、침출시간、NaO H초시질량농도、액고체적질량비대SiO2 침출솔적영향 ,탐구료감침탈규동역학.시험결과표명 :대양다금속결핵감침탈규반응적표관활화능위44 .31 kJ/mol ,침출반응준순화학반응공제적립경축소수축핵모형 ;재170 ℃ 、NaO H초시질량농도480 g/L、액고체적질량비4:1조건하반응180 min ,SiO2 침출솔체81 .5% .해방법가피면물리선광배절차무폐사산생,위대양다금속결핵청길생산제공료일조가공선택적신도경.
Pre-desiliconization of ocean polymetallic nodules by NaO H solution under and temperature high pressure was investigated .The effects of initial NaOH concentration ,leaching temperature ,mass ratio of liquid-to-solid ,leaching time on leaching of silicon and the leaching kinetic were examined .The results show that under the conditions of reaction temperature of 170 ℃ ,the NaO H mass concentration of 480 g/L ,the ratio of liquid-to-solid of 4:1 and reaction time of 180 min ,the leaching of SiO2 can up to 81 .5% .T he reaction apparent activation energy is 44 .31 kJ/mol .By the process ,the majority of SiO2 can be removed from the ocean polymetallic nodules ,no physical processing and no tailings .The process accords with cleaning production request ,and may provide a new alternative way for ocean polymetallic nodules .