低浓度和低用量盐酸分解白钨精度的研究

对低浓度、低用量盐酸分解白钨精矿进行了研究。结果表明：采用分角温度９５－１０５℃，分解时间１．５ｈ，盐酸用量理论量的１．５倍，浓度为１０％的盐酸分解白钨精矿，其平均分解率可达９７．３５％，与传统酸分解工艺相比，本工艺大量减少了盐酸用量和降低了协酸浓度，因而显著降低了废酸处理费用和基本上避免了在酸分解过程中ＨＣｌ气体挥发。这既改善了工作环境条件，又减少了治理ＨＣｌ气体环境环保投入费用。其不足之处是酸     

酸法工艺处理白钨精矿的最新进展

综述酸法工艺处理白钨精矿近年来的最新进展，将其与碱法工艺处理白钨精矿进行了分析比较，指出酸法工艺处理白钨精矿仍具有极强的生命力，并提出了最新的酸法工艺流程。     

白钨精矿中微量铅锌的示波极谱测定

特级白钨精矿是目前钨精矿生产的一个新品种,含铅锌分别在0.03％以下。方法以酸分解试样,双硫腙苯萃取分离富集,在盐酸、醋酸铵底液中示波极谱连续测定铅、锌。     

一种新的强化浸出法

研究了一种新的强化浸出方法——机械活化浸出法处理白钨精矿、平果铝土矿和锌酸浸渣。结果表明,在160℃、碱用量为理论量的2.20～2.40倍、70～90min条件下,可实现白钨精矿的NaOH溶液浸出,工业规模下,钨浸出率达98％以上。一水硬铝石及铁酸锌的浸出行为均可得到改善,其浸出率可明显提高。     

二级淋洗处理湿法冶金尾气中的HCl气

本文介绍了一种用二级淋洗处理白钨精矿湿法冶金尾气中的HCl气的方法。实践证明，该方法的应用，既能从根本上治理HCl气体污染，又能最大限度地降低处理成本。     

NaHSO4焙烧-HCl浸出从白钨矿中提取钨的工艺研究

国内普遍采用碱分解-离子交换法处理白钨矿，但存在危废量大、废水量大、生产成本高的问题，严重制约了中国钨冶炼行业的可持续发展。在大量白钨焙烧分解工艺研究的基础上，结合硫酸氢钠焙烧分解白钨的发现，提出白钨矿硫酸氢钠一步焙烧转型的冶炼新思路。结果表明，白钨矿经硫酸氢钠焙烧分解后，产物主要为WO₃,Na₂SO₄和CaSO₄；在NaHSO₄·H₂O用量为理论用量的2.5倍，焙烧时间为2.5 h，焙烧温度为650℃的条件下，白钨矿中99.5%的CaWO₄转型为WO₃；焙烧产物采用盐酸浸出法，在盐酸浓度为3 mol·L^-1，浸出时间为60 min，盐酸溶液与焙烧产物液固比15∶1，转速为300 r·min^-1，浸出温度为90℃的条件下，焙烧产物中的CaSO₄脱除率达到98.04%，产物中的WO₃由28.95%富集到95.23%，酸浸产物杂质...     

某矿黑钨与白钨分离试验研究

针对黑钨与白钨共生矿床选厂黑钨、白钨互含影响彼此精矿质量的问题，进行黑钨与白钨分离研究。通过纯矿物研究试验，论证了先磁选黑钨后浮选白钨的方案为目前较佳分离工艺。对某钨矿堆存的黑钨与白钨混合精矿进行的试验研究表明：先磁后浮方案优于其它方案，可得到特级黑钨、白钨精矿。当原矿品位含WO367.02％（黑钨8．47％，白钨58．55％）时，回收率为96.34％。     

WO3–CaSO4在HCl–Na2SO4溶液中的平衡溶解

目前钨冶炼的碱分解工艺,存在用水量大、废水量大、加工成本高等问题,使钨冶炼企业面临着经济与环保的双重压力,不能继续满足行业发展需求。对此,在大量白钨焙烧分解工艺研究的基础上,提出了酸法焙烧思路,开发出了硫酸盐焙烧分解白钨工艺,一步转型生成WO₃。由于白钨矿焙烧产物的主要杂质为Na₂SO₄与难溶CaSO₄,可采用盐酸浸出方式进行钨钙分离,本文采用等温平衡法,考察对比了WO₃、CaSO₄与WO₃–CaSO₄在HCl–Na₂SO₄溶液中的溶解行为,结果表明:WO₃与CaSO₄在盐酸中的溶解度相差较大,CaSO₄在盐酸中溶解度随温度、盐酸浓度的升高而增大,在温度80 ℃、盐酸浓度3 mol·L–1的条件下,硫酸钙在盐酸中的溶解度达到峰值55 g·L–1,而Na₂SO₄可显著降低CaSO₄在盐酸中的溶解度,缩小CaSO₄与WO₃在盐酸中的溶解差,WO₃溶解度则维持在0.3～3 g·L–1范围内,结合目前成熟的低钨回收工艺,能将该部分溶解钨有效地回收,即控制一定的溶解条件有利于钨钙高效分离。      

盐酸-络合浸取白钨精矿的动力学研究

<正> 一、前言 工业上处理钨精矿广泛采用经典的酸法或碱法生产仲钨酸铵。在酸法工艺中,用盐酸分解白钨精矿的浸取反应是多相化学反应。在20～80℃下,测得反应的平衡常数约为10~4。从化学平衡的观点来看,反应应该进行得很完全,但实际上在相当长的时间内都     

白钨精矿浮选除磷

本文论述白钨台浮工序生产的白钨精矿含磷超标，原先现场使用盐酸的办法，时间长、劳动强度大、金属损失大。通过单槽浮选脱磷的试验证明，水玻璃是该矿石中磷灰石的良好抑制剂，使白钨精矿中含磷由０．１８％降到０．０２％～０．０３４％，得到较满意的结果。     

熔炼次数对M17返回料合金成分、组织和性能的影响

实验结果表明,M17铸造高温合金(%:0.16C、8.79Cr、5.79A1、4.93Ti、3.29Mo、15.20Co、0.78V、0.015B、0.073Zr、0.002S、0.001P、0.001 1O、0.001 0N)经25 kg真空感应炉返回重熔后,Si含量随重熔次数的增加而略有增加,合金中主要元素和其它杂质元素S、P、H的含量变化不大,而氧、氮略有增加;合金中初生碳化物由新合金中的草书体逐渐向返回合金块状转变,初生碳化物的遗传性堵塞合金凝固时的补缩通道,使返回料合金的疏松倾向增大,高温塑性下降较大。     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.