油页岩制备白炭黑与分散剂应用的研究

以油页岩为原料,采用碱溶-沉淀法制备了白炭黑。具体工艺条件为:NaOH/SiO2(摩尔比)=4,水/油页岩(质量)=1,100℃,6 h,粒径≥0.15 mm。分别研究了NH4Cl、正丁醇、PEG三种分散剂对制备白炭黑的影响。FT-IR和XRD分析表明,三种分散剂对白炭黑的化学结构和无定型状态没有改变;TEM分析表明,三种分散剂对白炭黑的粒度和分散效果都有明显的作用,其中PEG对白炭黑的粒度和分散性能具有很好的效果。     

用硅藻土制备超细白炭黑工艺中氨基硅烷的作用研究

以硅藻土为原料,用沉淀法制备白炭黑的工艺中,就氨基硅烷KH-550的用量对白炭黑吸油率和比表面积的影响进行了研究,结果表明:改性白炭黑产品粒度分布均匀,可达纳米级,用W4的氨基硅烷改性后的产品具有最大的比表面积,其值为250.184m2/g,改性剂分子与白炭黑颗粒表面发生了化学吸附.     

用硅藻土制备白炭黑工艺中乙烯基硅烷的作用研究

研究了以硅藻土为原料,用沉淀法制备白炭黑的工艺中,乙烯基硅烷A-151的用量对白炭黑吸油率和比表面积的影响,结果表明:改性白炭黑产品粒度分布均匀,可达纳米级,用w4的乙烯基硅烷改性所得产品具有最大的比表面积,其值为232.908m2/g,改性剂分子与白炭黑颗粒表面发生了化学吸附。     

机械研磨制备硅灰石-SiO2复合颗粒及其表征

采用机械研磨法,通过白炭黑湿法研磨解聚和硅灰石-白炭黑共混研磨手段制备硅灰石-无定形SiO2复合颗粒,对复合过程各因素进行了优化,对硅灰石-SiO2复合颗粒的结构进行了表征。结果表明,硅灰石-SiO2复合颗粒以硅灰石表面均匀包覆无定形SiO2为特征所形成,在球料比5∶1条件下,浆体质量分数15%、硅灰石与SiO2复合比例5∶5、复合研磨时间40 min为优化条件。     

新疆哈密钾长石制备白炭黑的工艺研究及其结构表征

以新疆哈密钾长石和碳酸氢铵为原料采用沉淀法制备了白炭黑.根据单因素及正交实验,确定出最佳工艺条件为:反应温度70℃,钾长石煅烧熟料溶液A质量分数8％,反应时间3h,陈化时间2h,钾长石与分散剂正丁醇用量比为1∶1.875(g∶mL).按HG/T 3061-2009标准对白炭黑进行分析,白发黑中SiO2含量为93.55％,其DBP为2.95 mL/g,比表面积为137.645 m2/g.采用XRD、SEM和TEM对白炭黑进行了微观结构表征.XRD分析表明,白炭黑具有无定型结构.SEM分析表明白炭黑颗粒表面呈现蜂窝状微孔,表面较为疏松.TEM显示白炭黑为球状粒子,平均粒径为16nm,并且其分布较为均匀.     

石棉尾矿盐浸渣制备超细白炭黑的工艺条件研究

以石棉尾矿盐浸渣为原料,通过碱浸制成偏硅酸钠溶液。向反应容器底液中同时注入偏硅酸钠和硫酸溶液,控制底液pH值稳定在7.5左右沉淀超细白炭黑。考查了超细白炭黑制备过程中偏硅酸钠浓度、反应温度、表面活性剂和电解质用量以及干燥方式对白炭黑样品性能的影响;采用扫描电子显微镜、X射线衍射仪、红外光谱仪及激光粒度分析仪等对所制备白炭黑样品的形貌、物相和粒径等进行了表征。结果表明,偏硅酸钠浓度和温度对白炭黑的生成率有较大影响,醇洗能够有效控制和减少白炭黑样品的团聚现象,在最佳实验条件下制得的白炭黑样品化学结构为无定形水合二氧化硅,比表面积(BET)为102.43m2/g,白炭黑生成率达75%以上。     

高铝粉煤灰酸法提铝尾渣制备超细白炭黑及应用研究

以高铝粉煤灰酸法提铝为原料,在常压下通过碱溶使原料中的Si O2转化为硅酸钠,再利用化学沉淀法,制备了超细白炭黑;采用粒度仪、白度仪、SEM、XRD等方法对制备的白炭黑进行了表征。结果表明:该白炭黑纯度高,粒度细,比表面积大,对高分子聚合物的补强效果明显。该方法工艺简单,成本低廉,既解决了尾矿堆积问题,又大大降低了白灰黑的生产成本,对白炭黑的生产具在重要指导意义。     

用搅拌磨制备超细粉体的试验研究

使用介质搅拌磨并以0 8～1 4mm氧化锆陶瓷微珠为研磨介质对水镁石、电气石、云母(包括白云母、金云母、绢云母)进行了超细粉碎试验。选择适宜的助磨剂、分散剂、料浆浓度、研磨时间等试验条件,得到了d50=0 78μm、d97=1 85μm的水镁石和d50=0 75μm、d97=1 07μm的电气石,以及d50=0 75μm、d97=1 93μm的云母超细粉体;而且物料的原有晶形在超细粉碎过程中得到了保护。     

用搅拌磨制备超细粉体的试验研究

使用介质搅拌磨并以φ0．8～1．4mm氧化锆陶瓷微珠为研磨介质对水镁石、电气石、云母(包括白云母、金云母、绢云母)进行了超细粉碎试验。选择适宜的助磨剂、分散剂、料浆浓度、研磨时间等试验条件，得到了d50=0．78μm、d97=1．85μm的水镁石和d50=0．75μm、d97=1．07μm的电气石，以及d50=0．75μm、d97=1．93μm的云母超细粉体；而且物料的原有晶形在超细粉碎过程中得到了保护。     

膨润土制备白炭黑的工艺研究

黑山膨润土中二氧化硅含量可达71.39%,是制备白炭黑的理想原料。其中主要矿石成分是蒙脱石,蒙脱石是由Si-O四面体和Al-O八面体交替堆积而成,其层间结构非常紧密,Si不易被碱溶出,所以使蒙脱石的结构彻底瓦解是提高白炭黑回收率的关键。本文以黑山膨润土为原料,经硫酸活化,盐酸二次脱杂,碱溶,加酸中和等过程,制得纳米级非晶态二氧化硅。试验着重考察了硫酸浓度及酸溶时间、Na F用量、碱用量及碱溶时间对白炭黑回收率的影响,并利用X射线衍射仪,扫描电子显微镜等对产品的晶体结构及形貌进行表征。最终确定了用膨润土制备白炭黑的较佳工艺条件。     

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。