重庆中低品位铝土矿选矿精矿溶出性能工艺研究

针对重庆南川地区A/S 7.5以上选矿精矿进行溶出实验,研究了相关的工艺参数对溶出过程的影响。结果表明:在配料αk为1.45、溶出温度260℃、溶出时间80 min、CaO添加量为矿石量的6%、溶出碱浓度为220 g/L的最优条件下进行溶出实验,氧化铝的平均溶出率达到86%以上,相对溶出率达到99%以上。

锰矿选矿精矿烧结试验研究

针对国外某锰矿选矿精矿开展烧结试验研究,论证低品位锰矿富集后的产品制备锰系产品的可行性,烧结正交试验结果表明:在燃料配比10.0%、混合料水分14.0%、熔剂配比6.5%、烧结负压5900 Pa的条件下,获得的烧结矿成品率79.7%,利用系数0.64 t/(m2·h),固体燃耗193.9 kg/t,转鼓强度62.3%,高温冶金性能良好,符合后续冶炼工序的要求。

铁精矿选矿自动化控制系统的应用

在铁精矿的选矿过程当中,自动化控制系统的使用明显增强了生产的效率与最终产品的品质。文章对自动化控制系统在铁精矿的选矿过程中的核心理论、关键技术和未来的应用前景进行了综述。然后探索了自动化控制系统在传感技巧、控制策略、实时监控以及系统整合等多个领域中的创新进展。经过深度分析,证实了自动化控制系统能够显著优化生产流程、降低作业风险,并带来显著的经济收益。未来,随着科技持续向前发展,自动化控制系统在铁路选矿技术中的角色将显得尤为关键。

钒钛铁多金属矿选矿粗精矿冶金富集试验研究

采用直接还原工艺处理TFe、TiO2、V2O5含量分别为48.57%、15.69%、0.76%的钒钛铁多金属矿选矿粗精矿。在添加剂为15%硫酸钠+1.5%硼砂,还原剂为HY-烟煤,还原温度1150℃,还原时间90 min,磨矿细度为粒径小于0.074 mm的矿粒含量占77.5%,磁场强度120 mT的条件下,可获得TFe含量92.13%、Fe回收率95.45%的金属铁粉及TiO2、V2O5含量分别为44.07%和2.01%的富钒钛料,Ti、V回收率分别为87.77%和82.79%。富钒钛料可冶金提取回收V和Ti,为这类资源的综合利用提供了可行的技术路线。

Efficient enrichment of nickel and iron in laterite nickel ore by deep reduction and magnetic separation

The process of deep reduction and magnetic separation was proposed to enrich nickel and iron from laterite nickel ores.Results show that nickel-iron concentrates with nickel grade of 6.96%,nickel recovery of 94.06%,iron grade of 34.74%,and iron recovery of 80.44% could be obtained after magnetic separation under the conditions of reduction temperature of 1275℃,reduction time of 50 min,slag basicity of 1.0,carbon-containing coefficient of 2.5,and magnetic field strength of 72 kA/m.Reduction temperature and time affected the possibility of deep reduction and reaction progress.Slag basicity affected the composition of slag in burden and the spilling and enriching rate of nickel-iron from a matrix to form nickel-iron particles.Nickel-iron particles were generated,aggregated,and grew gradually in the reduction process.Nickel-iron particles can be effectively separated from gangue minerals by magnetic separation.

Two-step flotation recovery of iron concentrate from Donganshan carbonaceous iron ore

The flotation of pure and natural carbonaceous iron ore samples in the oleate flotation system was investigated.Starch can depress hematite effectively in a wide pH range,but cannot depress siderite efficiently in neutral conditions.The flotation recovery of pure hematite,siderite,and quartz in the oleate-starch-CaCl2 system is significantly different when the slurry pH varies from 4 to 12.A novel two-step flotation process was developed for the separation of iron concentrate from Donganshan carbonaceous iron ore through which the siderite concentrate is first recovered and the high quality hematite concentrates with relative high iron recovery can be obtained in the second step flotation.The siderite concentrate may be utilized directly or undergo further concentration steps to increase iron grade.

Study on the sedimentation capability of bauxite flotation concentrate

The sedimentation behaviors of bauxite flotation concentrates were investigated at different pH values and floceulant dosages. The effects of three types of flocculants （ cationic, anionic and non-ionic polyacrylamide floceulants） as well as the molecular weight of anionic flocculants on the sedimentation of concentrate were studied. It is shown from the experimental results that at the pH 7.0, best sedimentation capability is reached when anionic polyacrylamide flocculant （molecular weight 14 million） is added and the optimal dosage is 30 g/t.

Beneficiation of a low grade limestone sample

Pilot scale column flotation studies were conducted on a low grade siliceous limestone ore. Silica content was reduced to less than 13g in the concentrate so that it became satisfactory for use in the paper or rubber industries. The limestone sample was crystalline and constituted primarily of calcite that contained quartz, feldspar, pyroxene, and biotite as gangue minerals. Quartz is the major silicate gangue whereas feldspar, pyroxene, and biotite exist in minor to trace quantities. Traces of pyrite were also observed within the sample. A reverse flotation process was adopted where the silicate gangue minerals were floated using two different commercial cationic collectors： Chem-750 F or Floatamine-D. The studies clearly suggest it is possible to produce a limestone concentrate assaying around 96-97% CaCO3 containing less than 1 % Si02. The effect of feed flow rate, percent solids, froth depth, and wash water on the grade and recovery of the CaC03 concentrate is discussed.