6060铝合金阳极氧化膜受热开裂行为影响因素的分析

研究了硫酸浓度、电流密度、氧化温度、氧化后存放时间、封孔时间以及加热温度和加热时间等因素,对6060铝合金阳极氧化膜受热开裂行为的影响.结果表明:在H2SO4浓度为200 g/L左右,氧化温度为19℃左右,电流密度为1.3～1.6 A/dm2的阳极氧化工艺参数下,所得到的氧化膜热裂性能较好,氧化膜的抗热裂点温度为62℃...     

硫化钠溶液电解氧化产生多硫化物的研究

报道了直接电解硫化钠水溶液水产生多硫化物溶液的研究,电解槽采用阳离子隔膜分为阳极与阴极室,阳极液为Ｎａ２Ｓ水溶液,阴极液为ＮａＯＨ水溶液（１ｍｏｌ／ｄｍ＾３）分析了影响电解槽槽电压各成分的分布情况,结果表明,电解温度在６１℃时,槽电压可控制在０．９～１．２Ｖ之间,电流密度２０～３０ｍＡ／ｃｍ＾２之间,阳极过电位在０．４Ｖ以下,研究了电解温度,电解时间,硫化钠溶液浓度及电流密度对多硫化物生成效率的影     

用硫酸氧化预处理从难处理金矿中提金的无害化工艺研究

探讨了硫酸作为氧化剂分解含砷难处理金矿的技术可行性,实验结果表明硫酸可以有效地氧化砷黄铁矿而实现金的单体解离,适宜的分解条件为：硫酸与矿粉重比为３,采用机械搅拌反应温度２４０－２６０℃,分解时间２－３ｈ,分解渣采用硫脲浸出时浸金率高于９５％,浸金条件为：硫脲浓度１％,三价铁作氧体剂,氧化剂与络合剂幽会为０．０４－０．０６,浸出时间６ｈ。     

硫酸介质中毒砂氧化作用速率和砷的释放

与硫化物有关的黄金矿山开发往往引起酸性矿水和砷的释放。用Ｆｅ２（ＳＯ４）３和ｐＨ＝１．８作反应介质，模拟毒砂的氧化与温度及氧化剂浓度的关系。结果显示毒砂氧化时释放的砷随Ｆｅ２（ＳＯ４）３浓度升高而以指数关系递增和高浓度的Ｆｅ２（ＳＯ４）３氧化剂和较低的反应温度可以降低水体中Ａｓ（Ⅲ）的浓度。     

建筑铝型材宽温快速阳极氧化节能工艺及应用

为解决建筑铝型材传统阳极氧化工艺能耗过大的问题,进行了宽温阳极氧化工艺试验,研究了添加剂GYK-1含量对阳极氧化温度上限、阳极氧化电压及成膜速度的影响,同时探索了Al³⁺浓度对阳极氧化温度上限的影响,得到最佳宽温阳极氧化工艺条件为:H₂SO₄浓度160～180 g/L,添加剂GYK-1用量50 g/L,Al³⁺浓度20～25 g/L,氧化温度35±2℃,电流密度150 A/m²,氧化时间17 min。该节能工艺成功应用于生产,在保证氧化膜达到国家标准情况下,阳极氧化工艺温度上限从22℃提高到33℃,成膜速度提高20%,电压降低10%,大幅度降低能耗的同时提高了生产效率,为铝型材厂节能生产提供了有效途径。     

氧化铅锌矿石浮选新药剂的应用研究

氧化铅锌矿石浮选新药剂的研究关系到大量复杂的氧化铅锌矿资源的开发利用。本文报导从氧化铅锌矿石中浮选硫化铅矿物的新捕收剂ＰＮ及相应的抑制剂ＢＤ_１。使用ＢＤ_１（５０ｇ／ｔ）和硫酸锌（０～４０ｇ／ｔ）配合作抑制剂，显著提高了硫化铅矿物浮选效率，从５５．５２％提高到６４．０３％，氧化铅浮选时，使用ＢＤ_２（０～１００ｇ／ｔ）和六偏磷酸钠（１００ｇ／ｔ）作抑制剂，碳酸铅矿物浮选效率从５３．１８％提高到５４．６５％；而氧化锌浮选时，使用ＢＤ_２（０～１００ｇ／ｔ）和六偏磷酸钠（５０ｇ／ｔ）作抑制剂取得了更明显的效果，碳酸锌矿物的浮选效率从６４．８１％提高到７２．２９％，锌粗选作业回收率８４．８１％，粗精矿中锌品位３０．５０％。可见，所研制的ＰＮ捕收剂和ＢＤ_１、ＢＤ_２抑制剂，对提高氧化铅锌矿石浮选指标起了重要作用。     

预混合对阿马斯拉氧化煤浮选的影响

在实验室条件下,考察了无机物含量料高的阿马斯拉氧化煤浮选的影响因素。将煤术在空气中长时间地放置使其氧化。预混合是将６０％的煤与４０％的水制成煤浆以除去煤表面的氧化层。混合过程中, 通过混合体颗粒间的摩擦而除去。预混合时间分为１、２、３、４、５、１０、１５和２０（ｍｉｎ）,预混合后进行浮选试验,得到了起泡时间与发热量、可燃物回收率及灰分间的关系。另外,研究了预混合与浮选效率的关系,及将氧化煤在惰性介     

热处理对6013铝合金显微组织、力学性能和氧化膜质量的影响

采用不同的固溶时效热处理方案处理6013铝合金,利用金相显微镜、扫描电镜、维氏硬度计及拉伸实验机等分析仪器,研究固溶和时效热处理对6013铝合金显微组织、力学性能和氧化膜质量的影响.结果表明:固溶温度越高,或者固溶时间和时效时间越长,铝合金中Mg_2Si析出强化相的尺寸越细小,分布越均匀,铝合金的拉伸性能越高,阳极氧化膜越透亮;在550℃固溶30 min及170℃时效30 h的条件下,6013铝合金可以获得最优的力学性能,其维氏硬度值为131、抗拉强度为388.1 MPa、屈服强度为368.5 MPa、伸长率为10.5%,同时铝合金还具有优异的氧化效果,阳极氧化膜通透清亮,满足3C产品对铝合金外壳力学性能和阳极氧化膜质量的双重要求.     

温度和炉料含铅量对锑白质量的影响

本文在６００～７５０℃温度下，实验研究了含铅为３％～１０％的高铅锑合金的氧化挥发过程。原料含砷小于０．０５％，熔池最后残料（底水）含铅２０％～３０％。所得产品锑白达到０～１级锑白的质量要求。文中讨论了实验中容易出现的故障及所采取的克服措施。     

火焰原子吸收法测定低含量氧化铜矿物

以无水亚硫酸钠作为抑制剂，用硫酸溶液浸出矿样，浸出液用原子吸收法的测定铜，准确测定矿样中低含量的氧化铜矿物。无水亚硫酸钠浓度1％，硫酸浓度3％，浸出时间45min，测定结果的标准偏差为0．002－0．004，相对标准偏差4．3％－4．5％。     

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