热球磨碱分解技术在我厂的应用

<正> 一、前言我厂在黑钨矿碱分解的过程中,由于钨精矿中钙的存在,在一般压煮工艺技术条件下,钨的分解率通常只有96%左右。为了提高金属回收率,降低生产成本,引进了中南工业大学的专利技术及设备。经过一年多的生产实践,用热球磨机分解高钙钨精矿共333批,合计重213.11吨。     

碱法热球磨分解高钙黑钨精矿

在基础理论研究与碱法热球磨分解难选钨中矿工业实践的基础上,研究了碱法热球磨分解高钙黑钨精矿的新工艺,并已成功地应用于5家钨冶炼厂。实践表明,用理论量1.8倍左右的 NaOH溶液分解含 Ca≤3.42%的黑钨精矿、粗精矿、不预磨、在150～165℃下分解2h,钨的分解率稳定于98.63%～99.33%,主要杂质平均溶出率为 Sn2.0%、As12.7%、Mo75.7%、Si12.7%,粗Na_2WO_4 溶液经离子交换工艺可使产品达到国标 GB10116-88的 APT-0 和 APT-1级质量标准。     

卡林型金精矿加压氧化—铁矾分解—非氰提金研究

某卡林型金精矿为典型难处理金精矿,绝大部分金被黄铁矿和砷黄铁矿包裹,直接浸出时金浸出率仅为7.8%。针对卡林型金精矿提金困难、氰化提金污染严重等问题,创新性提出了加压氧化—铁矾分解—非氰提金方法。卡林型金精矿经加压氧化预处理和铁矾分解处理可实现包裹金的高效解离,氧压渣和破矾渣在反应时间2 h、活性炭用量50 g/L、搅拌速度400 r/min、温度30℃、pH值1.3～1.5、空气流量2 L/min、液固比4∶1、硫脲用量4 g/L条件下,金浸出率分别为76.2%和86.1%,实现了卡林型金精矿的高效、清洁提取。     

碳酸钠焙烧盐酸浸出分解氟碳铈矿精矿工艺的研究

系统地研究了焙烧温度、焙烧时间和碳酸钠的加入量对氟碳铈矿精矿焙烧分解的影响及浸出时间、浸出温度、盐酸浓度和盐酸用量对三价稀土和铈的浸出率的影响。针对氟碳铈矿精矿的分解,提出了碳酸钠焙烧、水洗除杂、稀盐酸浸出处理氟碳铈矿精矿的简单工艺。在实验室内扩大实验的条件下,首次由焙烧、浸出两步制得了高质量的高铈抛光粉,同时也得到了制取少铈富镧氯化稀土的原料。     

包头稀土精矿添加氧化钙焙烧工艺研究

本文研究了包头稀土精矿不同状态下的分解率 ,通过对比发现在助熔剂 (Na Cl Na2 SO4)和氧化钙存在的情况下 ,包头稀土精矿可以得到有效的分解 ,采用正交试验得到分解包头稀土精矿合理的工艺条件。     

信息苑

一种白钨矿、黑钨矿碱分解的联合分解工艺本发明公开了一种白钨矿、黑钨矿碱分解的联合分解工艺。先将白钨矿、黑钨矿各自磨细后分别进行碱压煮分解,固液比1∶1.1～2.7,压煮温度140～200℃,压力0.3～1.1MPa,时间为1～6h。白钨矿碱分解,NaOH的加入量为理论量的2.7～3.7倍,控制初始碱度为500～600g/L,分解完成后稀释过滤时加入理论量2%～15%的含PO3-4添加剂,控制碱度为150～200g/L,加入理论量0.8～1.2倍的含PO3-4添加剂。本发明钨的分解率达99%左右,可利用冶炼厂现有的通用压煮设备同时处理黑钨精矿、白钨精矿、黑白钨混合矿、钨中矿和回…     

锑金精矿矿浆电解阳极区选择性氧化浸出研究

研究了锑金精矿矿浆电解过程中阳极区硫化矿物选择性氧化分解热力学基础。结果表明,黄铁矿标准氧化分解电位较辉锑矿低,从热力学角度看,黄铁矿会被优先氧化分解;当溶液中加入Cl~-以后,辉锑矿和黄铁矿氧化分解电位都呈现下降趋势,其中辉锑矿下降更为迅速;在研究条件下,当Cl~-浓度大于2.05mol/L时,辉锑矿的分解电位小于黄铁矿,在热力学上使得辉锑矿优先选择性氧化分解成为可能。矿浆电解法处理锑金精矿实验中,锑的浸出率可超过98%,而铁的浸出率在8%以下,可实现锑的选择性浸出。     

包头稀土精矿浓硫酸低温焙烧工艺技术研究

采用浓硫酸低温动态焙烧方式分解包头稀土精矿,考察了焙烧温度、矿酸比、回转窑倾角、转速等因素对稀土精矿中稀土和钍分解率的影响。结果表明,包头稀土精矿浓硫酸低温焙烧工艺可行,稀土和钍的浸出率均大于95%,水浸渣的放射性总比放达到国家非放射性渣排放标准。具有推广应用前景。     

钨钽铌粗精矿碱分解试验研究

针对难分解钨钽铌粗精矿的冶炼问题,采用了高压碱分解工艺,成功地实现了钨钽铌精矿中钨难分解的问题。研究针对江西某大型钨、钽铌矿床矿石重选矿泥,经选矿试验获得的钨钽铌粗精矿,探讨了NaOH加入量、Na3PO4·12H2O加入量、液固比、分解温度、分解压力、分解时间对钨分解率的影响。结果表明,NaOH加入量为理论量的1.70倍,Na3PO4·12H2O加入量为理论量的1.26倍,液固比为3,分解温度200℃,分解压力1.5 MPa,分解时间5 h,钨的分解率能达到99.84%,分解渣中WO3含量为0.16%。     

磷精矿中微量稀土回收的试验研究

针对磷精矿中稀土品位低、成分复杂等特征,开发了二段酸分解、PHX直接萃取稀土工艺.磷精矿经盐酸低酸一次分解和硝酸高酸二次分解,磷的分解率达到了99%以上,稀土的总浸出率超过94%;在无需除杂、无需调酸的前提下,PHX直接萃取稀土的收率不低于95%.     

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.