细磨活化对白钨矿浸取行为的影响SCIEI

本文研究了细磨活化对白钨矿浸取行为的影响.实验结果表明,细磨活化后白钨矿在HCl-Na_3PO_4介质中的浸出速率显著加快,钨的浸出率由原来的约8％提高到99％以上.红外光谱和X射线分析结果表明,细磨除了使白钨矿比表面积显著增大外,还在固体的表面和内部产生缺陷结构,增加了矿物表面的反应活性,改善了白钨矿的分解,使得白钨矿的浸出能在较低的温度顺利进行。     

EFFECT OF FINE GRINDING ACTIVATION ON LEACHING BEHAVIOUR OF SCHEELITE CONCENTRATE

The influence of mechanical activation on the leaching behaviour of scheelite was studied bymeans of fine grinding in an attritor and subsequently HCl leaching in presence of PO_4~(3-).Results showed that after fine grinding in the attritor,the reaction rate of scheelitewith HCl-Na_3PO_4 solution was remarkably increased,the extraction of W increased fromabout 8 to 99%.The IR spectra and X-ray diffraction analysis indicated that in addition toan enlargement of surface area the fine grinding action had made also changes of fine struc-ture and reactivity of solid surface,hence the leaching process of scheelite can be carried outunder mild leaching conditions.     

Production of high purity APT from scheelite and complex tungsten raw material with high Mo content

More than 73% of the tungsten resources in China are scheelite and 41% are high molybdenum content ores, and their dressing becomes increasingly difficult. Such situation calls for new and advanced processes that can treat complex ores and still attain high overall recovery of tungsten. The novel NaOH digestion process and selective precipitation process was developed. The former is universal for leaching tungsten from various tungsten materials,including scheelite concentrate and keeps most of the impurity elements P, As and Si in residue; while the latter is effective for removing impurities such as Mo and Sn. Combined with the traditional ion exchange process, the new process can be used to produce APT that confirms with the Chinese National Standard GB10116-88APT-0 with crystallization ratio of 95%. When treating high molybdenum scheelite concentrate from Shizhuyuan Deposit with WO3 content of 50%-55%, recovery of the new process may reach up to about 95% which is grossly the same as that from the traditional way for treating standard wolframite concentrates.     

工艺参数对白钨矿直接炼钢的影响

通过实验研究了工艺参数对白钨矿收得率的影响规律。完全用白钨矿冶炼含钨高的合金钢(9%W)是可行的。硅铁还原白钨矿时,炉渣碱度应控制在1.5以下。碳粉还原白钨矿时,渣中最好不要添加CaF2。硅铁和碳混合还原剂还原白钨矿时,碳还原白钨矿比例控制在30%以下能取得较好的还原效果。     

从浮选尾矿中回收白钨矿试验研究

为充分利用矿产资源,提高企业效益,经过近2年的技术攻关,直接从硫化矿浮选尾矿中浮选回收白钨矿试验获得成功。通过粗选工业试验和粗精矿加温小型试验,在白钨入选品位0.25%的条件下,取得了白钨精矿65.046%、回收率50.47%的较好指标。对项目进行可行性研究论证,预计投产后能大幅提高企业效益。     

水玻璃及其在白钨矿浮选中的应用和分析

收集了国内外有关水玻璃的研究及其在白钨矿浮选中应用和分析的文献,综述了水玻璃的性质、溶液化学特性和抑制机理,详细阐述了水玻璃在白钨矿浮选中的多种应用形式,并对其进行了分析、总结和展望。     

某低品位黑白钨共生矿选矿工艺研究

某低品位复杂难选黑白钨矿矿物共生关系密切,嵌布粒度细,矿石性质差异性大,获得较好的技术指标较难。分别采用"磁-浮"黑钨白钨分类浮选选矿工艺和"浮-磁-浮"白钨优先浮选选矿工艺对该矿石进行选矿研究。"磁-浮"黑钨白钨分类浮选选矿工艺可获得品位72.59%,回收率30.15%的白钨精矿和品位55.36%,回收率47.81%的黑钨精矿,钨总回收率77.96%。"浮-磁-浮"白钨优先浮选选矿工艺获得WO3品位74.57%、回收率72.90%的白钨精矿和WO3品位28.88%、回收率8.48%的黑钨精矿,钨总回收率为81.38%。     

组合捕收剂浮选回收白钨矿选矿试验研究

江西某矽卡岩型白钨矿中钨矿物与萤石、方解石、石榴石等脉石矿物以各种产状紧密共生,嵌布粒度为以细粒为主的中-细粒不均匀嵌布,属难选白钨矿石.在对其矿石性质充分分析的基础上,重点采用731氧化石蜡皂、油酸钠及配制的组合捕收剂LGW进行对比试验,同时对工艺流程进行了加温与不加温常规精选的对比试验,结果表明,组合捕收剂LGW对该矿具有较强的选择捕收效果,经一粗二精二扫的闭路流程获得白钨粗精矿;粗精矿经过加温预处理后2次精选可获得含WO369.20%,回收率78.30%的白钨精矿,粗精矿通过磁场预处理及长时间强烈搅拌后经5次常温精选可获得含WO359.00%,回收率79.60%的白钨精矿.     

低品位白钨矿选矿技术的研究发展

系统地介绍我国低品位白钨矿选矿技术现状及发展。详细阐述了浮选、非浮选选矿工艺以及选矿联合工艺在低品位白钨矿的选矿中的作用及其进展。重点指出对于品位低、组分复杂、细粒嵌布的白钨矿,单一选矿工艺已经很难解决问题,加大力度研究重、磁、浮、化等选矿工艺之间联系,组成联合工艺,实现各个工艺之间的优劣势互相补充,协同效应最大化,是未来大力度开发利用低品位白钨矿,保持我国钨业持续发展的发展方向。     

从重选尾矿中浮选回收微细粒白钨矿试验研究

澳大利亚Watershed白钨重选尾矿含WO30.45%,其中-25μm的微细粒级金属分布率高达83.59%,且含有碳质、云母等易浮脉石,回收较为困难。针对此难选矿样进行了白钨浮选回收试验研究,最终以BK416为捕收剂,采用"预先浮选—常温浮选—加温精选"工艺,获得了WO3品位59.13%的钨精矿,选矿回收率65.72%。