蛇纹石型硫化铜镍矿浮选理论与技术研究进展

含蛇纹石脉石的硫化铜镍矿是我国镍资源的主要来源。蛇纹石质软,易泥化,在硫化铜镍矿浮选常用的弱碱性pH区间,脉石矿物蛇纹石表面荷正电,而硫化矿物表面荷负电,二者之间存在较强的静电吸引作用,容易发生异相凝聚。异相凝聚导致蛇纹石矿泥罩盖在硫化矿物表面,抑制了硫化矿物的浮选。脱附硫化矿物表面罩盖的蛇纹石矿泥是提高该类型硫化铜镍矿回收率的关键。脱附罩盖矿泥的方法有化学脱附法和物理脱附法。化学脱附法是利用六偏磷酸钠、碳酸钠、羧甲基纤维素、水玻璃等化学药剂改变蛇纹石表面电性,使蛇纹石与硫化矿物之间的相互作用由吸引变为排斥,从而消除蛇纹石对硫化矿物的抑制作用。物理脱附法是利用流体力场和超声外场的作用脱附硫化矿物表面罩盖的蛇纹石矿泥,消除蛇纹石对硫化矿物的抑制作用。根据该类型硫化铜镍矿的矿石特点及相关理论研究开发的酸法浮选、脱泥浮选等浮选技术,取得了较好的选别效果。     

六偏磷酸钠在镍黄铁矿/蛇纹石浮选体系的作用研究

通过矿物浮选试验、动电位测试及Zeta电位分布、扫描电镜观测等研究手段,考察了六偏磷酸钠在蛇纹石/镍黄铁矿浮选分离体系中的作用,分析了六偏磷酸钠对矿物颗粒间的分散作用机理。结果表明,在镍黄铁矿/蛇纹石浮选体系中,蛇纹石的存在降低了镍黄铁矿的回收率,而加入六偏磷酸钠使镍黄铁矿的浮选环境得到改善,回收率上升。机理研究表明：在一定pH值范围内,蛇纹石与镍矿铁矿表面荷电相反,蛇纹石可通过静电作用与镍矿铁矿发生"异相凝聚"而罩盖在其表面,从而降低镍矿铁矿表面的疏水性能,导致其可浮性下降;六偏磷酸钠可以使蛇纹石的表面电位由正变负。此时,蛇纹石和镍矿铁矿之间的电性相同,两者之间由静电吸引变为静电排斥,从而减弱蛇纹石在镍矿铁矿表面的附着,消除蛇纹石对镍黄铁矿的抑制作用,提高镍黄铁矿的浮选回收率。     

羧化壳聚糖对镍黄铁矿/蛇纹石浮选体系的作用机理

通过矿物浮选试验、沉降试验、动电位和DLVO理论计算,考察了羧化壳聚糖在蛇纹石/镍黄铁矿浮选体系中的聚集/分散作用,研究了羧化壳聚糖对颗粒间的分散作用机理。研究结果表明：蛇纹石颗粒通过异相凝聚罩盖于镍黄铁矿表面上,降低镍黄铁矿表面疏水性能,影响其可浮性;羧化壳聚糖消除了镍黄铁矿与蛇纹石颗粒间异相凝聚,提高镍黄铁矿/蛇纹石体系中镍黄铁矿的浮选回收率。在pH为8.5时,羧化壳聚糖对镍黄铁矿/蛇纹石颗粒间的分散作用显著,并且强于羧甲基纤维素;荷正电的蛇纹石通过静电作用吸附在荷负电镍黄铁矿表面影响其浮选,羧化壳聚糖加入显著改变蛇纹石表面电性,使镍黄铁矿与蛇纹石颗粒间由静电吸引变为静电排斥,表现为异相分散,从而提高镍黄铁矿的浮选回收率。     

细粒硫化铜矿与易泥化钙镁矿物的浮选分离

承德某硫化铜矿铜品位仅为0.44%,脉石矿物主要为蛇纹石及方解石等钙镁矿物。针对黄铜矿粒度细、脉石矿物易泥化而导致黄铜矿分选效率低的特点,采用"一段脱泥-二段分级分选"的工艺流程,并使用酸化水玻璃作为脉石矿物的主要抑制剂,进行了硫化铜矿选矿试验,取得精矿品位13.97%,回收率82.98%的良好分选指标。通过对矿石的扫描电子显微镜(SEM)分析、单矿物Zeta电位及润湿接触角的测定,表明黄铜矿与蛇纹石及方解石的异相凝聚是其难选的主要原因。酸化水玻璃可以显著降低蛇纹石及方解石的表面动电位,在p H=7~9的浮选区间内使其电位由正变负,消除与黄铜矿的异相凝聚;酸化水玻璃中最具活性的硅酸胶粒可强烈吸附在蛇纹石及方解石表面,增强其亲水性,从而有利于与黄铜矿的浮选分离。     

蛇纹岩(纤蛇纹石和蛇纹石)矿泥覆盖对镍黄铁矿浮选的影响

硫化镍矿石的选别,常常受脉石中所含蛇纹岩矿物的干扰。研究了蛇纹岩矿物如纤蛇纹石和蛇纹石矿泥的覆盖对未被氧化的镍黄铁矿浮选影响。此外,还曾使用在pH9时以戊基黄原酸钾为捕收剂的微型浮选试验、电泳和电子显微镜扫描。发现矿泥覆盖层的形成与矿泥和硫化矿表面电荷有直接关系。添加改变矿泥表面电荷的化学药剂,如羧基甲基纤维素、糊精、焦磷酸盐和水玻璃,可有效地减少矿泥对镍黄铁矿浮选的有害影响。     

铜镍硫化矿浮选技术难点研究进展

铜镍硫化矿的浮选技术难点主要集中在蛇纹石、滑石等含MgO脉石矿物的抑制,目的矿物与磁黄铁矿、黄铁矿等硫化矿物的分离,以及铜、镍精矿的分离。结合相关文献,对硫化铜镍矿浮选技术难点存在的原因和解决方法进行了综述分析。     

新疆某难选硫化铜镍矿选矿试验研究

根据新疆某硫化铜镍矿矿石的工艺矿物学特性,进行了详细的选矿试验研究,采用一粗一精两扫、中矿顺序返回的铜镍混合浮选流程,使用碳酸钠做pH调整剂,六偏磷酸钠做分散剂,羧甲基纤维素做抑制剂,混合黄药做捕收剂,处理该矿石,得到了混合精矿含镍10.89%、含铜4.27%,镍回收率81.61%、铜回收率85.03%的指标,氧化镁含量低于6.8%,产品质量符合冶炼要求。对六偏磷酸钠和羧甲基纤维素在硫化铜镍矿浮选中的作用机理进行了分析,结果表明六偏磷酸钠能分散蛇纹石与硫化矿物,降低蛇纹石对硫化矿物浮选的影响,而羧甲基纤维素能抑制含镁硅酸盐矿物的上浮,实现硫化矿物与含镁硅酸盐脉石的浮选分离。因此,在含有多种镁硅酸盐脉石矿物的硫化铜镍矿中同时使用六偏磷酸钠和羧甲基纤维素是该类矿石高效利用的关键。     

方解石对白铅矿硫化浮选性能影响研究

通过浮选实验、吸附量测试、Zeta电位测试等方法研究了方解石对白铅矿硫化浮选的影响。结果表明,丁基黄药作用下白铅矿的可浮性较好,而方解石基本不可浮;方解石粒度对白铅矿硫化浮选影响较大,粒度越小白铅矿硫化浮选性能越差;pH=9.5左右时,白铅矿表面荷负电,方解石表面荷正电,两种矿物由于静电吸引作用而发生异相凝聚,使微细粒方解石罩盖在白铅矿表面,从而降低硫化钠在白铅矿表面的吸附,抑制白铅矿的浮选。     

铜镍硫化矿浮选预脱泥的试验研究

喀拉通克铜镍硫化矿中的滑石及蛇纹石化橄榄石等易浮脉石矿物的存在，严重干扰了铜镍矿物的浮选，不仅增加了药剂消耗，而且影响了浮选指标。通过工艺矿物学和脱泥试验研究，采用新型MB起泡剂浮选预脱泥，减轻了矿泥对锡镍选别的影响，显降低了药剂成本。     

某铜镍硫化矿浮选脱除滑石的研究

某铜镍硫化矿中存在的滑石及蛇纹石等易浮脉石矿物严重干扰了铜镍矿物的浮选,影响了浮选指标。通过工艺矿物学研究和浮选脱泥试验研究,考察了磨矿细度、起泡剂的种类、pH值和浮选时间对浮选脱泥的影响,通过浮选确定了最佳浮选脱泥条件,并探讨了其原理。浮选脱泥减轻了矿泥对铜镍选别的影响,在保证精矿质量不变的前提下,提高了铜镍精矿的回收率。并在工业试验中得到了验证。     

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

正~~     

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