以铝土矿浮选尾矿为研究对象,探讨了铝土矿浮选尾矿用作水泥基材料的热力活化、物理活化、化学活化技术。结果表明,铝土矿浮选尾矿活化的工艺条件为：煅烧温度800℃,煅烧时间30 m in,粉磨细度（＋180目）〈2%,添加化学激发剂Na2S iO30~3...以铝土矿浮选尾矿为研究对象,探讨了铝土矿浮选尾矿用作水泥基材料的热力活化、物理活化、化学活化技术。结果表明,铝土矿浮选尾矿活化的工艺条件为：煅烧温度800℃,煅烧时间30 m in,粉磨细度（＋180目）〈2%,添加化学激发剂Na2S iO30~3%、FeC l30.5%~1.5%、Na2SO41%~3%、KA l（SO4）20~1%。展开更多
The flotation of diaspore and three kinds of silicate minerals, including kaolinite, illite and pyrophyllite, using an organosilicon cationic surfactant (TAS101) as collector and starch as depressant was investigated....The flotation of diaspore and three kinds of silicate minerals, including kaolinite, illite and pyrophyllite, using an organosilicon cationic surfactant (TAS101) as collector and starch as depressant was investigated. The results show that both diaspore and aluminosilicate minerals float readily with organosilicon cationic collector TAS101 at pH values of 4 to 10. Starch has a strong depression effect for diaspore in the alkaline pH region but has little influence on the flotation of aluminosilicate minerals. It is possible to separate diaspore from aluminosilicate minerals using the organosilicon cationic collector and starch depressant. Further studies of bauxite ore flotation were also conducted, and the reverse flotation separation process was adopted. The concentrates with the mass ratio of Al2O3 to SiO2 of 9.58 and Al2O3 recovery of 83.34% are obtained from natural bauxite ore with the mass ratio of Al2O3 to SiO2 of 6.1 at pH value of 11 using the organosilicon cationic collector and starch depressant.展开更多
The flotation properties of single minerals such as diaspore, kaolinite and pyrophllite in bauxites were investigated using RL as collector. The effects of regulators and unavoidable ions on flotation were studied. Ba...The flotation properties of single minerals such as diaspore, kaolinite and pyrophllite in bauxites were investigated using RL as collector. The effects of regulators and unavoidable ions on flotation were studied. Based on the results of single minerals flotation, the separation experiments of mixed minerals and bauxite ore were carried out. The results of closed circuit test on the ore show that, using RL as collector, Na 2CO 3 and (NaPO 3) 6 as modifiers, the grade of Al 2O 3 and SiO 2 are respectively 70.74% and 6.37% in concentrate (Al/Si 11.11), and the recovery of Al 2O 3 can reach 90.52%.展开更多
Flotation indexes gradually decrease with the increase of cycle time of the backwater in bauxite floatation,and discharge of backwater brings environmental risk.In this study,methods such as Fenton-oxidation,adsorptio...Flotation indexes gradually decrease with the increase of cycle time of the backwater in bauxite floatation,and discharge of backwater brings environmental risk.In this study,methods such as Fenton-oxidation,adsorption and coagulation were used in the treatment of backwater,the flotation indexes were checked after backwater treatments,and Box-Behnken design(BBD)was used in the optimization of the main operating parameters.The results reveal that flotation indexes are effectively improved after coagulation treatment by polyaluminum ferric chloride(PAFC).The optimum parameters predicted by BBD are pH 7.55,1.09 g/L PAFC dosage and temperature of 25℃.Under these optimum conditions,a maximum recovery of Al2O3 of 82.83%and a minimum A/S of 1.30 of tailings are gained,while the deviations are less than 3%from the predicted values.These findings encourage the application of BBD for the optimization of critical parameters in backwater treatment.展开更多
Bauxite is the main raw material of the alumina industry.However,high-sulfur bauxite constitutes a relatively large proportion of bauxite resource in China.Excessive sulfur impurities in bauxite have significant impac...Bauxite is the main raw material of the alumina industry.However,high-sulfur bauxite constitutes a relatively large proportion of bauxite resource in China.Excessive sulfur impurities in bauxite have significant impact on the Bayer process,such as corrosion of equipment and pipelines,increased consumption of alkali,and difficulties in sedimentation of red mud particles after digestion.As the mainstreams of bauxite desulfurization technologies,the bauxite pre-desulfurization(roasting,electrochemistry,biology,flotation,etc)and Bayer process desulfurization(oxidation and precipitation)need to be fully understood for the further improvement of desulfurization performance.Here,an in-depth review on their mechanisms and advantages/disadvantages is presented.展开更多
基金Project(51304085)supported by the National Natural Science Foundation of ChinaProject(GJJ12363)supported by the Education Department of Jiangxi Province,ChinaProject(20142BAB216021)supported by the Natural Science Foundation of Jiangxi Province,China
文摘The flotation of diaspore and three kinds of silicate minerals, including kaolinite, illite and pyrophyllite, using an organosilicon cationic surfactant (TAS101) as collector and starch as depressant was investigated. The results show that both diaspore and aluminosilicate minerals float readily with organosilicon cationic collector TAS101 at pH values of 4 to 10. Starch has a strong depression effect for diaspore in the alkaline pH region but has little influence on the flotation of aluminosilicate minerals. It is possible to separate diaspore from aluminosilicate minerals using the organosilicon cationic collector and starch depressant. Further studies of bauxite ore flotation were also conducted, and the reverse flotation separation process was adopted. The concentrates with the mass ratio of Al2O3 to SiO2 of 9.58 and Al2O3 recovery of 83.34% are obtained from natural bauxite ore with the mass ratio of Al2O3 to SiO2 of 6.1 at pH value of 11 using the organosilicon cationic collector and starch depressant.
文摘The flotation properties of single minerals such as diaspore, kaolinite and pyrophllite in bauxites were investigated using RL as collector. The effects of regulators and unavoidable ions on flotation were studied. Based on the results of single minerals flotation, the separation experiments of mixed minerals and bauxite ore were carried out. The results of closed circuit test on the ore show that, using RL as collector, Na 2CO 3 and (NaPO 3) 6 as modifiers, the grade of Al 2O 3 and SiO 2 are respectively 70.74% and 6.37% in concentrate (Al/Si 11.11), and the recovery of Al 2O 3 can reach 90.52%.
基金Project(1053320170205)supported by the Research and Innovation Project of Graduate Students of Central South University,ChinaProject(502211704)supported by the Fundamental Research Funds for the Central Universities,China+3 种基金Project(SKL-SPM-201809)supported by the State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals,ChinaProject(SKLAM005-2016)supported by the State Key Laboratory of Applied Microbiology Southern ChinaProjects(51320105006,51504106,51871250)supported by the National Natural Science Foundation of ChinaProject(2015FB204)supported by the Science and Technology Project of Yunnan Province,China
文摘Flotation indexes gradually decrease with the increase of cycle time of the backwater in bauxite floatation,and discharge of backwater brings environmental risk.In this study,methods such as Fenton-oxidation,adsorption and coagulation were used in the treatment of backwater,the flotation indexes were checked after backwater treatments,and Box-Behnken design(BBD)was used in the optimization of the main operating parameters.The results reveal that flotation indexes are effectively improved after coagulation treatment by polyaluminum ferric chloride(PAFC).The optimum parameters predicted by BBD are pH 7.55,1.09 g/L PAFC dosage and temperature of 25℃.Under these optimum conditions,a maximum recovery of Al2O3 of 82.83%and a minimum A/S of 1.30 of tailings are gained,while the deviations are less than 3%from the predicted values.These findings encourage the application of BBD for the optimization of critical parameters in backwater treatment.
基金supported by the Henan Polytechnic University Science Fund for Distinguished Young Scholars,China (No. J2021-1)Foundation for University Key Teacher by Henan Province,China (No. 2020GGJS051)+2 种基金Key Project of Science and Technology Research of Education Department of Henan Province,China (No. 20A440004)Foundation for University Key Teacher by Henan Polytechnic University,China (No. 2017XQG-12)Henan Key Laboratory of Coal Green Conversion,Henan Polytechnic University,China (No. CGCF202009)
文摘Bauxite is the main raw material of the alumina industry.However,high-sulfur bauxite constitutes a relatively large proportion of bauxite resource in China.Excessive sulfur impurities in bauxite have significant impact on the Bayer process,such as corrosion of equipment and pipelines,increased consumption of alkali,and difficulties in sedimentation of red mud particles after digestion.As the mainstreams of bauxite desulfurization technologies,the bauxite pre-desulfurization(roasting,electrochemistry,biology,flotation,etc)and Bayer process desulfurization(oxidation and precipitation)need to be fully understood for the further improvement of desulfurization performance.Here,an in-depth review on their mechanisms and advantages/disadvantages is presented.
