贵州某萤石矿选矿试验研究及工业生产实践

针对贵州某萤石选矿厂入选矿石性质变化导致选矿生产技术指标恶化的问题,进行了浮选新药剂制度研究,并在选矿工业生产中应用。工业生产获得的指标为:萤石精矿含CaF297.0%、CaCO31.0%、萤石回收率79.62%。与旧药剂制度下选矿厂的生产指标相比,新药剂制度推广后萤石精矿品位提高9个百分点,碳酸钙含量降低5.8个百分点。选矿生产获得了化工级高品质萤石精矿。     

微波预处理前后萤石浮选的动力学分析

为阐明微波对萤石浮选的影响机理,本文研究了微波预处理前后萤石浮选回收率、吸附量的变化规律,并进行不同微波预处理方式下的浮选动力学计算。浮选试验结果表明,与微波处理前相比,微波预处理纯矿物、去离子水、加捕收剂的矿浆后,萤石的浮选回收率均有所提高,而微波预处理矿浆,萤石的浮选回收率显著降低。油酸钠吸附量计算结果与萤石浮选回收率的大小顺序一致。而萤石的浮选动力学计算结果发现,微波预处理前后,萤石浮选动力学均符合一级动力学模型。微波预处理萤石纯矿物、去离子水、加捕收剂的矿浆不仅提高了萤石的浮选回收率,还加快了浮选速率,而微波处理矿浆则降低了萤石的浮选回收率和浮选速率。     

萤石矿的磨矿实验研究

针对某萤石矿选厂萤石矿易粉碎的特点,进行了实验室磨矿条件的研究,确定了较合理的磨矿介质与矿量比例、磨矿时间、钢球配比等磨矿因素,为工业实验提供了理论依据。     

某地萤石矿浮选工艺及机理研究

对河南某萤石矿的矿石进行了可选性工艺研究。在弱酸性介质精选的工艺制度下, 通过“一粗一扫五精” 的单一浮选流程,得到的萤石精矿CaF₂ 品位为98.21 %, 回收率为90.16%, 精矿中SiO₂ 含量为0.79%。萤石精矿达到国家质量标准(GB5690-85)一级品。     

萤石选矿过程中二氧化硅的快速测定

试样以过氧化钠高温熔融,再用含有硼酸的酸性水溶液浸出,将二氧化硅转化成为可溶性硅酸。在一定酸度下,硅酸与钼酸铵作用,生成可溶性的硅钼杂多酸。用草酸掩蔽磷、砷等、用硫酸亚铁铵将硅钼杂多酸还原为硅钼蓝,之后进行光度法测定。二氧化硅的质量浓度在0－6mg/L范围内范合郎伯－比耳定律。此方法快速、简便、灵敏度高、可不经分离直接测定。     

难选多金属萤石矿选别回收萤石工艺特征的研究

对两种主要类型的难选多金属萤石矿的萤石选别进行了分析研究。发现调整合理的浮选矿浆ｐ Ｈ 值对提高萤石精矿质量很重要。另外流程结构及矿浆中重金属离子含量对萤石精矿品位也影响较大。     

复吹转炉应用无氟造渣剂--铁矾土的生产实践

介绍了鞍钢第二炼钢180t复吹转炉应用铁矾土替代萤石造渣工艺可行,对钢水脱[P]、脱[S]影响甚微。每吨钢成本下降3．43元,转炉污水中F^-质量分数下降95％程度。     

Influence of composition on structural evolution of high-entropy zirconates—cationic radius ratio and atomic size difference

Ten different high-entropy rare-earth zirconates with the general formula of A₂Zr₂O₇ were synthesized using reverse coprecipitation. Thereby, five cations were mixed on the A sublattice, and their composition was varied systematically regarding cation size to vary the cationic radius ratio r_A/r_B and the atomic size difference δ_A. Phase and chemical composition as well as morphology of the synthesized materials were examined by X-ray diffraction (XRD), scanning electron microscopy, energy-dispersive X-ray spectroscopy, electron backscatter diffraction, and electron probe microanalysis. Additionally, their phase stability was investigated using high-temperature XRD and differential scanning calorimetry. Single-phase materials were obtained when δ_A was below 4.5%. This threshold value was determined and verified using additional data taken from literature. The single-phase compositions formed pyrochlore or defect fluorite structure depending on their r_A/r_B with a threshold value of 1.46 being the same as for binary zirconates. Furthermore, the single-phase compositions remained stable up to high temperatures.