优化分子筛焙烧条件,提高分子筛质量合格率

焙烧强度对分子筛超稳化反应至关重要,探讨如何优化分子筛焙烧条件,提高焙烧强度,通过不断摸索,最终找到炉温控制和改善转筒黏料的方法,达到超稳化温度要求,分子筛质量合格率有了较大幅度的提高。     

关于阜康铜渣冶炼工艺的研究和选择

我国独立开发的镍精炼新工艺已在新疆实际应用。经阜康冶炼厂选择性浸出提取后,金属化高冰镍原料中大量铜及贵金属进入了铜渣。在完成了阜康铜渣吹炼粗铜的试验研究任务之后,北京矿冶研究总院又制订了铜渣"焙烧—浸出—电解"方案,并进行了验证试验。证实了该工艺具有铜回收率高、浸出液较为纯净可直接电解、镍能综合回收、浸出渣率低和贵金属富集比高等特点。结合公司和阜康实际,最终推荐了焙烧、浸出方案。该方案已被新疆有关部门采纳,于1999年建成了国内能力最大的采用溶液电积工艺生产电解铜的车间(5000t电解铜/a),投产后经济效益显著。     

石煤提钒的工艺评价

钒是一种重要的战略物资，具有广泛的用途。石煤是我国独特的一种矶矿资源，储量极为丰富。从石煤中提取V2O5是获得钒的重要途径。文中旨在对传统提钒工艺流程进行评价的基础上，总结了石煤提钒中的一些新工艺，并对石煤提钒工艺前景进行了展望。     

Thermodynamic analysis of the carbothermic reduction roasting of a nickeliferous limonitic laterite ore

As the sulfide ore deposits become less economically viable as a source of nickel, increasing attention is being paid to the nickeliferous laterite ores. However, in contrast to the sulfide ores, these oxide ores cannot be as easily concentrated by current technologies. Consequently, considerable research effort is being directed at developing new techniques for beneficiating the nickeliferous laterites. The pyrometallurgical production of a high-grade ferronickel alloy using a low cost carbonaceous reductant at relatively low temperatures is particularly attractive. In the current research, a thermodynamic model has been developed to aid in the understanding of the carbothermic reduction roasting process as a potential upgrading method for the nickeliferous limonitic laterite ores. The effects of process parameters such as temperature and reductant to ore ratio on the grade of the ferronickel alloy produced and the nickel recovery in the alloy have been studied. The thermodynamic predictions are shown to be in general agreement with the experimental results currently available in the literature.     

Demonstration of the conditions conducive to agglomeration of zinc calcine in fluidized bed roasters

Agglomeration in the fluidized bed roasting of zinc sulphide concentrate was investigated in a continuous pilot-scale fluidized bed roaster. Alone or together, low stoichiometric excess oxygen (<10%) and high temperature (>940 °C) contributed most significantly to agglomeration of zinc calcine particles. Only one test – with 0% excess oxygen at 940 °C – led to severe agglomeration and subsequent defluidisation. Neither large initial particle size nor low gas superficial velocity promoted agglomeration as much as the combination of low stoichiometric excess oxygen and high temperature.Lead sulphide, a common impurity in zinc sulphide concentrate, also appeared to have played a key role in agglomeration. Both low excess oxygen and high temperature favoured a high partial pressure of sublimated lead sulphide. Upon contact with oxygen, lead sulphide oxidised to lead oxide, which then precipitated as a liquid onto the rather inert bed particles. As a liquid, lead oxide formed coatings that caused small particles to adhere to larger ones, as well as liquid bridges that bound particles together.     

废弃稀土抛光粉回收再利用研究进展

这是一篇冶金工程领域的论文。以稀土抛光粉废料为原料,通过正交实验设计,首先进行废料与硫酸铵和硫酸氢铵混合物的焙烧实验,使稀土氧化物转化为硫酸盐。实验考查3个因素,每个因素取3个水平,选用正交表L₉(3⁴),安排了9个实验,统计分析实验结果：焙烧温度取480 ℃,焙烧时间取3 h,质量比取1.8∶1。然后在酸浸液中加入0.2%的硫脲作还原剂,研究用稀硫酸从焙烧固相中浸出稀土的工艺条件。实验考查4个因素,每个因素取4个水平,选用正交表L₁₆(4⁵),安排了16个实验,统计分析实验结果：酸浸温度取90 ℃,硫酸浓度取0.5 mol/L,浸出时间取4 h,稀硫酸与焙烧固相的液固比（质量）取4:1,稀土的浸出率可达97.8%～98.0%。     

酒钢选矿厂焙烧磁选系统改造实践

介绍了酒钢选矿厂焙烧磁选系统实施竖炉高效节能风机改造、特种水力旋流器与格子型球磨机组合应用于一段闭路磨矿、用BX型磁选机改造传统弱磁选机以及使用矩环式磁选机回收尾矿中铁矿物的实践,通过改造,主要技术经济指标得到进一步提高。     

钼镍矿提钼强化浸出试验研究

针对钼镍矿氧化焙烧过程中生成的MoO3、MoO2、Mo、Mo2S3等低价钼化合物很难被碱浸出的缺点,提出了一种"焙烧脱硫一次氯酸钠强化浸出"的技术方案,并通过对比试验确定了最佳工艺条件:氢氧化钠30%,次氯酸钠20%,浸出液固比3∶1,温度90~95℃,反应时间3h。试验结果表明,在最佳工艺条件下,钼的浸出率可达98%以上,浸出效果明显优于传统的提取方法。     

新疆某褐铁矿的选矿工艺研究

新疆某铁矿主要含褐铁矿，脉石为含铁硅酸盐矿物，采用浮选、重选、磁选和焙烧磁选等选矿方法进行了试验研究，试验研究表明，在原矿品位46.5%的情况下，焙烧磁选工艺可获得铁精矿品位59.2%、回收率92.9%的技术指标，从经济方面考虑，建议采用弱磁选－强磁选－正浮选工艺或分极－重选－细粒级浮选工艺联合流程比较适宜。     

某高磷鲕状赤褐铁矿的焙烧-磁选试验研究

介绍了四川某铁矿原矿铁品位38%左右,并且主要以鲕状赤褐铁矿形式存在,同时含磷高达0.65%左右,重点对此矿石进行了还原焙烧-磁选选矿试验,得到了含铁品位60%以上,铁的回收率在70%以上的铁精矿,同时铁精矿含磷也降到0.3%.解决了该铁矿含磷高,不能利用的关键问题.