重有色金属冶炼中砷的脱除与回收

介绍了铜、锡、铅、锌重有色金属冶炼过程中砷的分布和脱除情况。铜冶炼的脱砷重点在铜电解液的净化,主要采用电解法和溶剂萃取法,而铜冶炼过程中火法脱砷研究较少。锡精矿含砷0.5%~5.5%,一般在熔炼前进行焙烧脱砷,而冶炼过程中产生的高砷烟尘则采用电热回转窑焙烧法或湿法脱砷。铅锌冶炼过程脱砷的研究集中在高铅砷转炉烟尘、铅阳极泥及次氧化锌的脱砷研究。     

重有色金属冶炼中砷的脱除与回收

介绍了铜、锡、铅、锌重有色金属冶炼过程中砷的分布和脱除情况。铜冶炼的脱砷重点在铜电解液的净化，主要采用电解法和溶剂萃取法，而铜冶炼过程中火法脱砷研究较少。锡精矿含砷0．5％～5．5％，一般在熔炼前进行焙烧脱砷，而冶炼过程中产生的高砷烟尘则采用电热回转窑焙烧法或湿法脱砷。铅锌冶炼过程脱砷的研究集中在高铅砷转炉烟尘、铅阳极泥及次氧化锌的脱砷研究。     

高砷锑烟尘焙烧脱砷试验研究

高砷烟尘是铜、铅等冶金过程中产生的一种难处理副产物,回收其中有价金属之前,需要先脱砷。采用焙烧方法对高砷锑烟尘进行了脱砷预处理,考察了焙烧温度和焙烧时间对脱砷率的影响。结果表明:在焙烧温度550℃,焙烧时间120 min的条件下,采用流动空气,As、Pb的脱除率分别为41.51%和59.81%,需要进一步控制氧势以提高脱砷率。     

铜冶炼白烟尘酸化焙烧工艺研究

针对云锡铜业高砷高锡低铜白烟尘,开展酸化焙烧选择性脱砷的研究,考察活性炭配比、浓硫酸配比、焙烧温度、焙烧时间对砷、锡、铅、锌、铋、铜挥发率的影响。在焙烧温度450 ℃、焙烧时间3 h、活性炭加入量5%、硫酸加入量30%较优条件下,白烟尘砷挥发率为94.28%,锡、铅、锌、铋、铜挥发率分别为2.34%、3.71%、2.96%、1.43%、1.64%。酸化焙烧实现了砷的选择性挥发,使白烟尘中的砷形成开路,为后续有价金属的分别回收创造了有利条件。     

高砷铜烟尘中有价金属回收的试验研究

针对火法熔炼—湿法浸出工艺处理高砷铜烟尘有价金属回收率低,湿法浸出工艺处理高砷铜烟尘砷铁渣量大、会释放剧毒砷化氢气体的问题,采用低温硫化挥发的方法将砷与其他有价金属选择性地分离,实现了砷的去除和综合利用,砷以三氧化二砷产品的形式得以回收利用。挥发除砷后的焙砂采用加压硫酸浸出,铜、锌、铟大部分进入浸出液,锡、铋、铅入渣以铅冶炼原料得以回收。     

艾萨法炼铜过程中砷的分布及回收技术现状

砷是铜冶炼原料中的一种有害元素。砷的化合物存在于不同的冶炼产物中,并且砷的氧化物易挥发,对环境和人体健康危害较大。掌握铜艾萨法冶炼过程中砷的分布以及回收工艺是实现砷无害化的关键。首先,通过对艾萨法铜冶工艺中砷元素在投入和产出物料中的占比进行平衡计算。结果表明,进入到烟尘和硫酸系统中的砷分别占总投入砷量的76.86%和5.54%;然后,介绍了近些年来从含砷烟尘和污酸中处理脱出收砷的一些工艺方法,主要包括火法工艺、湿法工艺、火法-湿法联合工艺及生物法处理工艺;结合砷在艾萨法冶炼过程分布的特点和现有的处理工艺,针对未来含砷烟尘和污酸废水提出了真空还原预热脱砷、低温硫化深度脱砷,污酸废水脱砷溶液结合生物法进行进一步脱砷的技术思路。     

艾萨法冶铜过程杂质砷的分布及回收技术现状

摘要：砷是铜冶炼原料中的一种有害元素,砷的化合物存在于不同的冶炼产物中,并且砷的氧化物易挥发,对环境和人体健康危害较大。掌握铜艾萨法冶炼过程中砷分布以及回收工艺是实现砷无害化的关键。通过对艾萨法铜冶工艺中砷元素在投入和产出物料中的占比进行平衡计算。结果表明,其进入到烟尘和硫酸系统中的砷分别占总投入砷量的76.86%和5.54%;结合砷在艾萨法冶炼过程分布特点,介绍了近些年来从含砷烟尘和污酸中处理脱出收砷的一些工艺方法,主要包括火法工艺、湿法工艺、火法-湿法联合工艺及生物法处理工艺。在此基础上,针对未来含砷烟尘和污酸废水提出了真空还原预热脱砷、低温硫化深度脱砷,污酸废水脱砷溶液结合生物法进行进一步的脱砷的新思路。     

高砷铜烟尘中有价金属回收的实验研究

针对火法熔炼—湿法浸出工艺处理高砷铜烟尘有价金属回收率低,湿法浸出工艺处理高砷铜烟尘砷铁渣量大、会释放剧毒砷化氢气体的问题,采用低温硫化挥发的方法将砷与其他有价金属选择性地分离,实现了砷的去除和综合利用,砷以三氧化二砷产品的形式得以回收利用。挥发除砷后的焙砂采用加压硫酸浸出,浸出液中的铟采用P204萃取,反萃后利用锌粉置换得到海绵铟,萃铟后的浸出液采用锌粉置换得到海绵铜,锌通过浓缩的方式制成七水硫酸锌产品,锡铋铅入渣以铅冶炼原料得以回收。     

砷碱渣/高砷锑烟尘协同脱砷及有价金属回收

采用砷碱渣代替碳酸钠与高砷锑烟尘进行协同脱砷并回收其中的有价金属。将碳酸钠、低砷碱渣、高砷碱渣分别与高砷锑烟尘按一定比例混合,通过焙烧-浸出-过滤工艺得到含砷浸出液和有价金属富集渣。结果表明,当原料配比分别为m_碳酸钠∶m_{高砷锑烟尘}=0.8、m_低砷碱渣∶m_{高砷锑烟尘}=3.0、m_高砷碱渣∶m_{高砷锑烟尘}=1.0时,砷浸出率分别为97.5%、96.9%、99.2%; 铅、锑浸出损失少而富集于浸出渣中,渣中有价金属总含量大于68.7%,且浸出渣中砷含量小于1.0%。该工艺砷脱除率高、有价金属回收率高,证明将堆存的砷碱渣直接用作脱砷剂,可以实现以废治废、资源回收,有效降低脱砷成本。     

高砷高锡铅阳极泥脱砷与综合回收工业试验

在前期高砷高锡铅阳极泥脱砷及资源综合回收小试、扩大试验基础上,设计建造了3t/d的高砷高锡铅阳极泥综合回收中试生产线。在碱料比(碳酸钠与阳极泥质量比)0.8、焙烧温度600℃、焙烧时间2.2h、液固比(mL/g)3、浸出温度80℃、浸出时间2h条件下实现了砷锡分离。浸出渣为锡铅锑渣,浸出液在80℃下蒸发结晶得到粗砷酸盐产品。产品锡铅锑渣含锡32.66%、铅12.65%、锑14.75%,粗砷酸盐中砷酸钠的纯度达到57.3%、含12个结晶水。高砷高锡铅阳极泥综合回收中试实现了阳极泥中砷和有价金属的分离回收,对于环境保护及资源的综合利用具有重要的现实意义。     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

2014 second batch of rare earth quota released

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矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586