Magnesium carbonate was prepared by carbonization leaching from desiliconization slag of laterite nickel ore,and the content of NiO in the residue reached 2.96%.The results showed that extraction ratio of MgO increase...Magnesium carbonate was prepared by carbonization leaching from desiliconization slag of laterite nickel ore,and the content of NiO in the residue reached 2.96%.The results showed that extraction ratio of MgO increased with increasing stirring speed,reaction time and liquid-to-solid ratio,however,the extraction ratio increased firstly and then decreased with increasing reaction temperature.When stirring speed was 600 r·min-1,reaction temperature was 15℃,reaction time was 36 h and liquid-to-solid ratio was 40∶1,the extraction ratio of MgO could reach as high as 91.57%.XRD analysis indicated that the product was magnesium carbonate,and its physical and chemical properties conformed to the state standards of chemical industry.展开更多
基金supported by the National Natural Science Foundation of China (Nos. 52074069, 52174314)the Natural Science Foundation of Hebei Province,China (Nos. E2020501022, E2022501030)+2 种基金the Fundamental Research Funds for the Central Universities,China (Nos. N2223027, N2223009)the Science and Technology Project of Hebei Education Department,China (Nos. ZD2021331)Performance Subsidy Fund for Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province,China (No. 22567627H)。
基金Projects(51204036,51234009)supported by the National Natural Science Foundation of ChinaProject(2014CB643405)supported by the National Basic Research Program of China
文摘Magnesium carbonate was prepared by carbonization leaching from desiliconization slag of laterite nickel ore,and the content of NiO in the residue reached 2.96%.The results showed that extraction ratio of MgO increased with increasing stirring speed,reaction time and liquid-to-solid ratio,however,the extraction ratio increased firstly and then decreased with increasing reaction temperature.When stirring speed was 600 r·min-1,reaction temperature was 15℃,reaction time was 36 h and liquid-to-solid ratio was 40∶1,the extraction ratio of MgO could reach as high as 91.57%.XRD analysis indicated that the product was magnesium carbonate,and its physical and chemical properties conformed to the state standards of chemical industry.
基金Projects(51204036,51234009)supported by the National Natural Science Foundation of ChinaProject(20110042120014)supported by the Research Fund for the Doctoral Program of Higher Education,China
基金Projects (52074069,52174314) supported by the National Natural Science Foundation of ChinaProjects (E2020501022,E2021501029,E2022501030) supported by the Natural Science Foundation of Hebei Province+2 种基金Projects (N2223027,N2223009) supported by the Fundamental Research Funds for the Central Universities,ChinaProject (ZD2021331) supported by the Science and Technology Project of Hebei Education Department,ChinaProject (22567627H) supported by Performance Subsidy Fund for Key Laboratory of Dielectric and Electrolyte Functional Material of Hebei Province,China。
基金Project(2014CB643405) supported by the National Basic Research Program of ChinaProjects(51204036,51234009) supported by the National Natural Science Foundation of ChinaProject(BJ201604) supported by the Program for Top Young Talents of Higher Education Institutions of Hebei Province,China
文摘研究低品位红土镍矿预焙烧过程矿相的转化和碱浸过程硅的提取。结果表明,红土镍矿经650°C预焙烧2 h,由于利蛇纹石转化为镁橄榄石和原顽辉石使得矿物的活性显著提高,当磨细矿样(44~61μm)经预焙烧后,与氢氧化钠溶液(60 g/L)按照1:5的固液比混合在140°C浸出120 min,硅的提取率可达到89.89%,镁、铁、镍等有价元素在固体渣中得到富集。红土镍矿的浸出动力学可由扩散通过产物层控制模型来描述,计算得到过程的活化能为11.63 k J/mol,动力学方程为1-3(1-x)^(2/3)+2(1-x)=13.53×10^(-2)exp[-11.63/(RT)]t。
