锡精矿氧化还原焙脱除砷硫半工业性试验

本文全面地论述了锡精矿回转窑氧化还原焙烧脱除砷、硫半工业性试验及其理论基础，介绍了该法脱除砷、硫的工业应用前景及各项技术经济指标。

某尾矿强磁选预富集产品的工艺矿物学研究及可选性分析

西南某多金属原生矿现场尾矿TFe品位13.88%,有害元素S含量为1.24%,主要脉石成分SiO2含量为40.82%,铁矿物主要以赤褐铁矿、菱铁矿及磁铁矿的形式存在,属复杂难选铁尾矿资源。为制定合理的二次资源综合回收工艺,从工艺矿物学角度出发,利用场发射扫描电镜(FESEM)、背散射电子成像(BSE)、X射线能谱分析(EDS)、矿物特征自动定量分析系统(AMICS)等多种检测手段,对现场强磁选预富集产品开展了矿物组成、铁矿物粒度分布、主要元素赋存状态、嵌布特征、解离特征以及热分解特性等系统的工艺矿物学研究。结果表明:采用预氧化—低温还原磁化焙烧—弱磁选选冶联合工艺,预富集产品经550℃预氧化7.5min后,在450℃、还原势R=0.6的条件下磁化焙烧7.5min,可获得作业产率90.84%、铁品位30.02%、磁化率95.05%的磁化焙烧产品;磁化焙烧产品再磨至-38μm占89.5%,经两段弱磁选铁,可获得作业产率28.94%、铁品位60.18%、铁作业回收率63.86%的铁精矿。研究结果可为后续开展合理的资源高效、综合回收试验提供理论支撑。

某难选含锰贫铁矿的选矿试验研究

本文针对云南某地含锰贫铁矿物嵌布粒度微细,组分复杂的特点,进行了选矿试验研究。研究结果表明:将碳粉加入原矿中进行氧化还原焙烧,再将焙烧所得矿石磨细至矿物单体解离后进行弱磁选回收铁矿物,可得到品位为49.78%、回收率为53.58%的铁精矿;弱磁选尾矿再用强磁选回收锰矿物,可得品位36.54%、回收率为81.69%的锰精矿。

硫酸铜生产工艺流程的优化设计

研究探讨硫渣隔膜电解、回转窑氧化还原焙烧、含铜焙砂硫酸浸出、浸出液冷却结晶生产硫酸铜,浸出渣再经回转窑氧化还原焙烧产出合格含锡焙砂,供给锡熔炼系统作为二次原料使用的优化工艺设计方案。

Manganese extraction from high-iron-content manganese oxide ores by selective reduction roasting-acid leaching process using black charcoal as reductant

Reduction roasting-acid leaching process was utilized to process high-iron-content manganese oxide ore using black charcoal as reductant. The results indicate that, compared with the traditional reductant of anthracite, higher manganese extraction efficiency is achieved at lower roasting temperature and shorter residence time. The effects of roasting parameters on the leaching efficiency of Mn and Fe were studied, and the optimal parameters are determined as follows: roasting temperature is 650 °C, residence time is 40 min, and black charcoal dosage is 10%(mass fraction). Under these conditions, the leaching efficiency of Mn reaches 82.37% while that of Fe is controlled below 7%. XRD results show that a majority of MnO2 and Fe2O3 in the raw ore are reduced to MnO and Fe3O4, respectively.