在较低温度下采用硫酸低温熟化—水浸工艺处理褐铁型红土镍矿,对熟化—水浸渣进行矿物学表征,并对熟化过程动力学进行了研究。结果表明,红土镍矿经过熟化—水浸处理,矿物的矿相发生转变:铁由针铁矿相转变为赤铁矿等铁的氧化物,大部分镍...在较低温度下采用硫酸低温熟化—水浸工艺处理褐铁型红土镍矿,对熟化—水浸渣进行矿物学表征,并对熟化过程动力学进行了研究。结果表明,红土镍矿经过熟化—水浸处理,矿物的矿相发生转变:铁由针铁矿相转变为赤铁矿等铁的氧化物,大部分镍钴矿物转变为硫酸镍和硫酸钴,小部分转变为难溶的铁酸镍和铁酸钴造成镍和钴的损失。硫酸熟化过程动力学研究表明,镍钴硫酸化动力学过程符合典型的多相液固区域反应动力学模型,镍钴硫酸熟化反应表观活化能分别为12.4 k J/mol和3.2 k J/mol,这一过程受内扩散控制。展开更多
An innovative technology,nitric acid pressure leaching of limonitic laterite ores,was proposed by our research team.The HNO3 regeneration is considerable significance for the improvement of the proposed technology and...An innovative technology,nitric acid pressure leaching of limonitic laterite ores,was proposed by our research team.The HNO3 regeneration is considerable significance for the improvement of the proposed technology and its commercial application,but it has not been systematically investigated.Herein,regenerating HNO3 from Ca(NO3)2 solution with low-cost H2SO4,and simultaneous synthesis of fibrous CaSO4·2H2O by-products were studied.As a theoretical basis,the solubility of CaSO4·2H2O in HNO3 medium is studied.It is concluded that the solubility of CaSO4·2H2O increases with increasing temperature or increasing HNO3 concentration,which has considerable guiding significance for the subsequent experimental research and analysis.Then,the effects of various factors on the residual Ca^2+ concentration of filtrate,the regenerated HNO3 concentration and the morphology of synthesized products are investigated using ICP-AES and SEM.And the effect mechanism is also analyzed.The results indicate the regenerated HNO3 concentration reaches 116 g/L with the residual Ca^2+ concentration being 9.7 g/L at the optimum conditions.Moreover,fibrous CaSO4·2H2O by-products with high aspect ratios(length,406.32μm;diameter,14.71μm;aspect ratio,27.62)can be simultaneously synthesized.展开更多
文摘在较低温度下采用硫酸低温熟化—水浸工艺处理褐铁型红土镍矿,对熟化—水浸渣进行矿物学表征,并对熟化过程动力学进行了研究。结果表明,红土镍矿经过熟化—水浸处理,矿物的矿相发生转变:铁由针铁矿相转变为赤铁矿等铁的氧化物,大部分镍钴矿物转变为硫酸镍和硫酸钴,小部分转变为难溶的铁酸镍和铁酸钴造成镍和钴的损失。硫酸熟化过程动力学研究表明,镍钴硫酸化动力学过程符合典型的多相液固区域反应动力学模型,镍钴硫酸熟化反应表观活化能分别为12.4 k J/mol和3.2 k J/mol,这一过程受内扩散控制。
基金Project(2182040)supported by the Beijing Natural Science Foundation,ChinaProjects(51674026,51974025,U1802253)supported by the National Natural Science Foundation of ChinaProject(FRF-TT-19-001)supported by the Fundamental Research Funds for the Central Universities,China。
文摘An innovative technology,nitric acid pressure leaching of limonitic laterite ores,was proposed by our research team.The HNO3 regeneration is considerable significance for the improvement of the proposed technology and its commercial application,but it has not been systematically investigated.Herein,regenerating HNO3 from Ca(NO3)2 solution with low-cost H2SO4,and simultaneous synthesis of fibrous CaSO4·2H2O by-products were studied.As a theoretical basis,the solubility of CaSO4·2H2O in HNO3 medium is studied.It is concluded that the solubility of CaSO4·2H2O increases with increasing temperature or increasing HNO3 concentration,which has considerable guiding significance for the subsequent experimental research and analysis.Then,the effects of various factors on the residual Ca^2+ concentration of filtrate,the regenerated HNO3 concentration and the morphology of synthesized products are investigated using ICP-AES and SEM.And the effect mechanism is also analyzed.The results indicate the regenerated HNO3 concentration reaches 116 g/L with the residual Ca^2+ concentration being 9.7 g/L at the optimum conditions.Moreover,fibrous CaSO4·2H2O by-products with high aspect ratios(length,406.32μm;diameter,14.71μm;aspect ratio,27.62)can be simultaneously synthesized.
