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采用碳酸钠焙烧—氢氧化钠浸出的方法,从含钨 1.4 %的碱浸钨渣中回收钨,试验研究了浸出温度、反应时间、碱浓度与液固比对钨浸出率的影响.结果表明,在浸出温度 80 ℃,碱浓度 130 g/L, 反应时间 45 min,液固比(指碱液与钨渣的质量比,下同)4:1 的试验条件下,钨的浸出率可达到 90.5 %, 达到了高效浸出钨的目的.该工艺方法流程简单,操作条件温和,回收率高,具有良好的应用前景. 相似文献
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某钼钨矿石钼、钨品位较低,其中钼含量0.36%、钨含量0.88%,-38μm占90%,矿石中矿物物相复杂、有用矿物粒度小且较为分散,矿物颗粒连生情况极其复杂。采用焙烧—化学浸出的方式回收钨、钼,开展了液固比、药剂用量、浸出温度和浸出时间的研究。研究表明:在液固比6 mg/g、氧化剂A用量10 kg/t、碱性浸出剂B和C用量分别为80 kg/t和9 kg/t、浸出时间4 h、浸出温度80℃的条件下,钼的浸出率为83.79%,钨的浸出率为39%。通过细磨强化,-20.043μm占90%,在同样条件下钼浸出率达到94.11%,钨浸出率为60.74%,取得了较好的浸出效果。 相似文献
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在分析SnO2和Cu2FeSnS4碱浸出热力学行为差异的基础上,研究了钨精矿焙烧预处理对锡浸出率的影响。研究表明,苛性钠浸出钨精矿时,SnO2极难浸出,浸出率接近为零,而Cu2FeSnS4的浸出率则高得多,在一般浸出条件下可高达40%~50%。钨精矿经过氧化焙烧后,可明显降低锡的浸出率,在焙烧温度为700~800℃、焙烧时间为2 h工艺条件下,Cu2FeSnS4所含硫化状态的锡就可完全转化为SnO2。锡的浸出率由5.96%下降至1.05%。 相似文献
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研究了采用高压碱浸法从高锡钨精矿中分离锡、钨,考察了浸出温度、碱浓度、浸出时间、液固体积质量比及添加剂用量等对锡、钨浸出率的影响。结果表明:将750℃下焙烧2h的高锡钨精矿进行高压碱浸,在添加剂用量为矿石质量的1.0%、温度150℃、氢氧化钠用量为理论量的3倍、浸出时间2.5h、液固体积质量比1∶1条件下,钨浸出率达98.57%,浸出渣中锡质量分数为3.34%;锡富集于浸出渣中,钨进入溶液,钨、锡得到有效分离。 相似文献
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含钨萤石中矿采用常压碱浸、苏打焙烧等工艺时,钨、铷及萤石回收率均不高.对该矿样进行了高压烧碱浸出工艺及盐酸预处理+高压碱浸工艺方案的探索试验,并进行了关键影响因素——碱加入量条件试验.经验证,当矿样用100%盐酸预处理,将预处理渣用水洗至pH值约为7后,加入1.5倍理论量烧碱+0.5倍理论量纯碱进行高压浸出试验,钨浸出率可达99%,铷可达84%,萤石分解率为50%.采用高压循环浸出后,碱耗可降低50%左右.该工艺指标好,三废可达标排放,经济效益明显. 相似文献
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G.G. Tulskij L.V. Liashok M.P. Osmanova I.N. Kolupaev 《Powder Metallurgy and Metal Ceramics》2020,58(9):499-502
Hardmetals intended to perform in harsh operating conditions are developed with the use of metallic powders, in particular, tungsten powders. The growing consumption of tungsten in industry necessitates the improvement of techniques employed to produce it from industrial waste. The objective of this research effort was to reduce metallic tungsten (as a powder) from chloride and chloride–fluoride melts and determine the factors influencing its particle size. The starting material was tungsten oxide (WO3) produced electrochemically from processed raw material (VK-6 tungsten carbide pseudoalloy). The melts were KCl–NaCl–CsBr and NaCl–KCl–CsBr–Na3WO3F3 eutectic mixtures. When the melt with a high WO2F42− content was subjected to electrolysis, tungsten precipitated as a superfine powder. The precipitate morphology showed that the tungsten particle size was dependent on electrolysis conditions. A relatively inexpensive and effective method of producing tungsten powders was developed upon the research. 相似文献
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国外高纯钨粉和钨材制备 总被引:1,自引:0,他引:1
赵秦生 《稀有金属与硬质合金》2003,31(4):56-57
简要介绍了国外高纯钨粉及钨材的某些制备工艺,并给出了某超纯钨粉及硅化钨粉(WSix)的分析结果。 相似文献
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The production of tungsten by direct current reduction has been investigated. Experimental studies involved the electrochemical
reduction of the solid tungsten compounds tungsten trioxide (WO3) and calcium tungstate (CaWO4) in the form of an assembled cathode of porous pellets attached to a current collector. Molten calcium chloride and a molten
solution of calcium chloride and sodium chloride at eutectic composition, 48 pct mol NaCl, were used as the electrolytes.
Reduced samples were characterized by means of X-ray diffraction analyses and scanning electron microscopy. The results of
X-ray analyses, supported with thermodynamic computations, showed that WO3 cannot be used without loss in processes that involve the use of CaCl2 at high temperatures because it reacts with CaCl2 by releasing volatile tungsten oxychloride. In the electrochemical reduction of CaWO4, X-ray diffraction results indicated the presence of tungsten with significant concentrations of calcium compounds. Metallic
tungsten was obtained after treating the reduced samples with dilute hydrochloric acid solutions. 相似文献
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钨精矿铝热还原法生产碳化钨--介绍一种新的碳化钨生产技术 总被引:1,自引:0,他引:1
赵秦生 《稀有金属与硬质合金》2003,31(3):49-50
介绍了国外以黑钨精矿或白钨精矿为原料,用“炉外”铝热还原生产高质量碳化钨的生产技术。采用该技术生产的碳化钨产品符合俄罗斯的技术标准要求.可用于钻探工具和硬质合金的生产。 相似文献
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广西某钨矿原矿含WO36.2%,原矿中的钨主要是以黑钨矿的形式存在,还有少量的钨华和白钨矿,采用磁-重联合流程,即采用一粗一精一扫湿式强磁选—钨粗精矿再摇床精选流程,可以达到钨回收率为92.19%的选矿指标,获得钨品位为71.74%,品质达国家二类一级品标准的优质钨精矿。 相似文献