A method for extracting tungsten and molybdenum from high molybdenum scheelite by Electrooxidation is described. High molybdenum scheelite was electrooxidized in sulfuric acid system. Tungsten and molybdenum coordinated with reactive oxygen species generated by anode to form soluble peroxytungstic acid and peroxymolybdic acid. After decomposition, solid-liquid separation was carried out. Ammonium paramolybdate was obtained from filtrate by extraction, stripping and impurity removal. Powdered tungstic acid was obtained from the residual liquid by high temperature decomposition or SO2 reduction. Hydrogen peroxide and sulfuric acid were added to mother liquor until the beginning. After concentration, ammonium paratungstate can be obtained by ammonia dissolution and impurity removal of tungstic acid. The invention realizes high-efficiency atmospheric pressure leaching of High-Molybdenum scheelite, without introducing any impurities in the leaching process, saves energy and reduces the subsequent purification burden, and the leaching rate of tungsten and molybdenum in the leaching process can reach more than 98%; the separation process of tungsten and molybdenum can realize the extraction of molybdenum without additional reagents, and the separation efficiency is high; the output of tungstic acid impurities is low, and the leaching agent can be recycled and reduced. The cost of leaching and the discharge of wastewater are simple.
【技术实现步骤摘要】
一种电氧化法分解高钼白钨矿提取钨、钼的方法
本专利技术属有色冶金领域,涉及一种电氧化法分解高钼白钨矿提取钨、钼的新方法。技术背景我国是世界最大的产钨国家,在钨的储量、产品产量、出口量和消费量上均居世界首位,掌握着世界钨市场的支配权。尽管我国钨资源丰富,但长期以来依赖于易选冶的优质黑钨资源,导致其储量所剩不多,目前已形成了白钨矿占绝对优势的局面。而我国白钨矿品位低、富矿少、矿床成分复杂,其共伴生组份就高达30多种,主要有锡、钼、铋、铅、锌、稀土、萤石等。其中钼和钨因离子半径相近,化学性质相似,呈类质同相存在于白钨矿中,常规的选矿法无法实现钨钼的分离,致使产出的钨矿中含有相当的钼。如占我国第三大钨矿床-柿竹园矿,其产出的钨精矿中Mo/WO3(质量比)达2%左右;河南栾川钨矿储量占全国工业储量的16%以上,其产出的钨中矿中Mo/WO3达5%以上。目前,高钼钨资源总储量已达全国工业储量的45%以上。众所周知,钨湿法冶金产出的产品中对钼的含量要求非常严格,如我国国家标准GB/T10116-2007规定仲钨酸铵0级产品中Mo/WO3不超过20×10-6,因此钨钼分离一直是钨提取冶金中最为重要的工序之一。目前,处理高钼白钨矿的主要途径是先进行矿物分解,再采用不同的除钼方法于后续工序中进行钨钼分离。分解高钼白钨矿的主要方法有NaOH分解法、Na2CO3压煮法和盐酸分解法。由于动力学和热力学上的原因,NaOH分解法和Na2CO3压煮法都需要在高温高压及高碱用量的条件下进行,浸出液中含有大量过剩碱。由于后续钨钼分离工艺要求,需要对酸碱度进行调节,最终产出大量可溶性钠盐溶液 ...
【技术保护点】
1.一种电氧化法分解高钼白钨矿提取钨、钼的方法,其特征在于:将高钼白钨矿在硫酸介质中进行电氧化浸出,钨、钼与阳极形成的活性氧配位后形成可溶性的过氧钨酸和过氧钼酸,钙则与硫酸根结合形成难溶的硫酸钙进入渣中,控制电解浸出过程的条件为:电解液中硫酸浓度为10%~60%,反应温度为30~80℃,矿浆液固比3:1~10:1mL/g,阳极电流密度为150~400A/m
【技术特征摘要】
1.一种电氧化法分解高钼白钨矿提取钨、钼的方法,其特征在于:将高钼白钨矿在硫酸介质中进行电氧化浸出,钨、钼与阳极形成的活性氧配位后形成可溶性的过氧钨酸和过氧钼酸,钙则与硫酸根结合形成难溶的硫酸钙进入渣中,控制电解浸出过程的条件为:电解液中硫酸浓度为10%~60%,反应温度为30~80℃,矿浆液固比3:1~10:1mL/g,阳极电流密度为150~400A/m2,浸出时间1~6h,浸出完全后进行固液分离,滤液经萃钼-反萃-除杂...
【专利技术属性】
技术研发人员:张文娟,王成彦,马保中,
申请(专利权)人:北京科技大学,
类型:发明
国别省市:北京,11
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