高品位氧化铜矿熔炼渣型优化实验研究

针对非洲某高品位氧化铜矿开展渣型优化实验研究,主要开展了氧化钙加入量、氧化亚铁加入量、焦率和精矿含水等实验研究.结果表明,矿石中的铜赋存在孔雀石中,在焦比5％、熔炼温度1400℃、还原熔炼时间2 h、CaO:SiO2=0.4:1、FeO:SiO2=0.1时,铜和钴回收率分别为99％ 和98％,熔渣含铜和钴分别为0.3％...     

刚果(金)某氧化铜精矿还原熔炼渣型优化实验

刚果（金）某地区经浮选得到的氧化铜精矿,含铜28.39 %,矿石中的铜主要赋存在孔雀石中。在实际生产中,采用鼓风炉还原熔炼处理该类氧化铜精矿,存在熔炼温度较高、氧化钙添加量大、熔炼渣含铜偏高的问题,为此,进行渣型优化实验研究,考察了还原焦比、CaO:SiO2比和氧化亚铁加入量对氧化铜精矿还原熔炼的影响。结果表明,在还原熔炼时,焦比主要影响粗铜产率和铜回收率,CaO:SiO2主要影响渣中铜含量,熔炼温度是影响渣黏度的主要因素。在还原焦比为5 %,选择酸性熔炼渣型,渣中CaO:SiO2为0.4-0.55,FeO:SiO2为0.13条件下,渣含铜可降至0.4 %以下,铜回收率在98 %以上。     

大洋锰结核和富钴结壳混合熔炼合金的锈蚀浸出研究

采用锈蚀浸出工艺处理大洋锰结核和富钴结壳混合熔炼合金粉末,研究了氯离子浓度、盐酸加入量、添加剂铜离子浓度以及空气和氧气等对合金中钴镍铜等有价金属浸出的影响。在最佳锈蚀浸出条件下铜钴镍浸出率分别为96.39%,93.51%和95.20%,合金中大部分铁进入渣中。     

硫化铜精矿氧化焙砂还原熔炼研究

对高品位硫化铜精矿氧化沸腾焙砂进行了还原熔炼实验研究, 首先将硫化铜精矿在沸腾炉中进行氧化焙烧, 然后将焙砂在添加炭质还原剂及石英、氧化钙等条件下进行还原熔炼。实验结果表明, 该硫化铜精矿在850 ℃, 氧化焙烧2 h得到的氧化焙砂, 在1 350 ℃下还原熔炼20 min可得到熔炼产品粗铜, 自熔渣熔炼时, 粗铜品位为88%~95%, 铜直收率为96%~98%; 加石英熔炼时, 粗铜品位为95%左右, 铜直收率为97%左右; 加CaO熔炼时, CaO 4%~9%, 粗铜品位为95%~97%, 铜直收率为93%~96%。     

刚果(金)某铜钴尾矿还原浸出钴

采用硫酸作浸出剂,对刚果(金)某尾矿库中的铜钴尾矿加入还原剂进行柱浸试验。研究还原剂种类、还原剂加入量、造球直径、反应温度、浸出时间等对钴、铜、铁、镁和锰等金属浸出率的影响,确定浸出最佳条件。在优化条件下,还原剂Na2SO3加入量为钴还原理论量的3.0倍,造球直径为8 mm,常温条件下浸出60 d,钴、铜、铁、镁和锰的浸出率分别为85.94%,92.93%,30.42%,21.84%和96.96%。优化条件下,钴浸出平均硫酸消耗为30 t/t-钴。     

含铁铜钴硫酸渣浸出液水解沉淀法除铁试验研究

为了从含铁及铜钴等有价金属的硫酸渣浸出液中回收铜钴,针对高浓度铁离子浸出液,提出水解沉淀法除铁,系统研究了氧化剂H₂O₂用量、氧化时间、滴定温度、滴定终点p H值、搅拌时间等对铁去除率以及铜钴损失率的影响。结果表明,最佳沉铁条件为H₂O₂用量5 m L、氧化时间2 h、滴定温度70℃、滴定终点p H=3.0、搅拌时间1.0h,此时浸出液中铁的去除率为91.97%,铜和钴的损失率分别为12.20%和12.04%。SEM-EDS和XRD分析结果表明,碳酸钙沉铁渣渣相单一,产物表面光滑,呈棒状和不规则的片状;产物主要物质为二水硫酸钙和针铁矿。在除铁过程中,少量的Cu和Co被沉淀物吸附,从而导致了Cu和Co的损失。     

大洋富钴结壳熔炼合金的锈蚀浸出及除铁研究

采用锈蚀浸出工艺处理DY95-9 航次大洋富钴结壳熔炼合金粉末, 研究了浸出酸量、浸出时间及催化剂对合金中钴镍铜等有价金属浸出率的影响。在最佳锈蚀浸出条件及经除去浸出液中的少量铁后钴镍铜锰的浸出直收率分别为93.68%、94.55%、91 .73%和95 .62%, 而几乎全部的铁、磷、碳和钼等进入浸出渣中, 锈蚀浸出过程中铁基本不耗酸。     

影响缓冷钴冰铜磁选分离的矿物学研究

为了确定影响缓冷钴冰铜钴铜磁选分离效果的因素，以便改善磁选分离效果，采用光学显微镜、电子显微镜、电子探针以及化学物相分析等方法研究了缓冷钴冰铜包顶壳、上部（侧壁）、中部及底壳等部位的物相组成，钴、铁、铜的赋存状态，钴铁合金的产出特征等。结果表明：①钴冰铜中部硫含量明显高于壳部，壳部钴主要以强磁性钴铁合金形式存在，中部钴主要以弱磁性钴铁硫化相形式存在，上部（侧壁）钴处于钴铁合金及硫化相的过渡相。钴冰铜包中部钴的金属转化率仅为16.35%，这是影响钴铜磁选分离效果的主要因素。②钴冰铜中氧化亚铁均不同程度被氧化为磁铁矿，从壳部到中部，氧化亚铁颗粒的氧化程度越来越深，氧化亚铁粒度一般以小于0.020 mm的微细粒分布于斑铜矿基底相中，磨矿时难以单体解离是影响钴铜磁选分离的另一主要因素。③要想提高缓冷钴冰铜包中部钴的金属转化率及磁选分离效果，需要调控高温钴冰铜包中部的缓冷温度，防止熔点不同的物质发生偏析，尤其是低熔点硫化物向中部聚集；另外需要保持缓冷过程中冰铜的还原环境，防止弥散于基底硫化相中的氧化亚铁颗粒被局部氧化为磁铁矿。     

基于共存理论的废线路板火法熔炼渣-铜平衡研究

基于炉渣结构离子分子共存理论,结合高温熔炼实验,研究了废线路板熔炼过程中铜、锡及铅在渣-铜平衡中的分配规律。以石灰为添加剂的废线路板混合料火法熔炼,其熔渣为CaO-SiO₂-Al₂O₃-FeO四元渣系。结果表明,使用熔渣结构离子分子共存理论,能较好表征该渣系组元的活度; 渣中FeO活度随着CaO含量增加先减小后增大,随着FeO含量增加而增大。渣中铜、锡及铅含量与渣中FeO活度成正比; 渣中铜、锡及铅含量随着碱度增加先降低后增加,随着FeO含量增加而增加。通过控制熔渣碱度(CaO/SiO₂)0.6~1.2、FeO含量15%~24%,可有效提高熔炼效果,使渣中铜含量低于0.7%、锡含量低于0.2%、铅含量低于0.2%。     

硫化铅精矿低温熔盐一步炼铅实验研究

采用还原造锍熔炼法从硫化铅精矿中低温、一步回收铅,考察了黄铁矿烧渣加入量、熔盐组成及用量对铅直收率及铁、铜分配行为的影响,证实了该技术路线的可行性。合理控制熔炼条件,铅直收率最高可达94.32%,粗铅纯度98.32%。铜和银主要分布在铁锍及粗铅中,铁及其它伴生元素主要分布在铁锍及炉渣中。     

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     

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     

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     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。