旋流-静态微泡浮选柱在金精矿浮选中的半工业试验研究

为实现金属高效回收,采用旋流-静态微泡浮选柱进行金精矿浮选半工业试验。结果表明:在给矿粒度-38μm占93%,浮选矿浆浓度25%~27%,给矿量400 kg/h,粗选药剂制度同生产现场,扫选不额外添加药剂的条件下,进行一粗一精一扫的闭路试验,可以得到精矿中金回收率97.33%,银回收率96.32%,铅回收率98.03%,锌回收率86.36%,铜回收率97.27%,硫回收率95.51%的良好指标,且均优于现场生产指标。

新疆某难处理含钒石煤焙烧—酸浸提钒试验研究

新疆某难处理含钒石煤中钒以极细粒分布在绢云母中,现场采用传统焙烧系统进行空白焙烧提钒,存在氧气浓度低、温度控制难等问题,最终钒浸出率仅为20%左右。为此,在充分分析原矿性质的基础上,采用自行设计的气基焙烧系统进行石煤原矿的空白焙烧试验研究,条件试验确定适宜的焙烧温度为800℃、焙烧时间为20 min、气体流量为400 mL/min、氧浓度为20%;对此条件下获得的焙烧样进行酸浸提钒,固定硫酸浓度30%、液固比1.25∶1、浸出时间3 h、浸出温度90℃,最终钒浸出率可达46.51%。研究结果表明新装置具有焙烧温度低、焙烧时间短、对矿石的选择性小、焙烧气氛精准可调等优点,可有效降低生产成本、提高生产效率。

Suspension roasting process of vanadium-bearing stone coal:Characterization,kinetics and thermodynamics

The thermodynamics,kinetics,phase transformation,and microstructure evolution of vanadium-bearing stone coal during suspension roasting were systematically investigated.Thermodynamic calculations showed that the carbon in the stone coal burned and produced CO_(2) in sufficient oxygen during roasting.The mass loss of stone coal mainly occurred within the temperature range from 600 to 840℃,and the thermal decomposition reaction rate increased to the peak at approximately 700℃.Verified by the Flynn−Wall−Ozawa(FWO)and Kissinger−Akahira−Sunose(KAS)methods,the thermal decomposition reaction of stone coal was described by the Ginstling−Brounshtein equation.The apparent activation energy and pre-exponential factors were 136.09 kJ/mol and 12.40 s^(−1),respectively.The illite in stone coal lost hydroxyl groups and produced dehydrated illite at 650℃,and the structure of sericite was gradually destroyed.The surface of stone coal became rough and irregular as the temperature increased.Severe sintering occurred at the roasting temperature of 850℃.

某冶炼公司金精矿细磨浮选产品结构优化

通过对金精矿及浮选尾矿产品进行工艺矿物学研究,并对磨矿浮选流程和工艺参数进行优化,提高了磨矿产品细度,优化了浮选产品结构,增加了公司的经济效益。