铝硅合金化法回收利用晶体硅切割废料研究

为实现晶体硅切割废料的回收利用,以晶体硅切割废料为原料,引入冰晶石作溶剂,采用熔配法在1150℃的熔炼温度下制备出了Si含量16.06%的铝硅合金。产品的XRD、SEM/EDS、金相结构等表征结果表明合金成分单一,组织均匀,结构清晰。进一步对反应机理进行研究,发现冰晶石熔盐将切割废料均匀分散并将其表面的SiO2溶解,与后续加入的Al进行熔盐内铝热还原反应,暴露出来的Si和过量的Al液在相界面接触,Si最终进入Al液形成铝硅合金。     

金刚线切割废料制备铝硅合金的研究

在晶体硅片生产过程中会产生大量的切割废料,不仅造成资源浪费,而且带来环境污染,有效回收该废料已成为亟待解决的问题。以晶体硅金刚线切割废料为硅源制备铝硅合金,引入冰晶石作为熔剂来促进硅的溶解。研究了冰晶石分子比对合金硅含量、切割废料利用率以及铝损失率的影响,得到较优的冰晶石分子比为1.6,此时得到的合金硅含量为11.74%,切割废料利用率为64.75%,铝损失率为4.78%。合金产物的XRD分析及金相表征结果表明制得的铝硅合金组织较为均匀。此外,对熔炼过程的机理也进行了系统的研究,结果表明,熔炼过程可分为两步:第一步,切割废料表面的SiO_2被熔解,使得颗粒内部的硅暴露出来;第二步,熔盐中的Si与Al液在界面处接触,生成Al-Si进入铝液。     

微量钛硅对热浸镀锌铝合金金相组织的影响探究

通过向热浸镀锌铝合金中分别掺入微量钛、硅元素, 探究不同含量的钛、硅对锌合金金相组织的影响。结果表明, ZnAl系合金Ti含量在0~0.01%之间, 其晶粒从多向生长转为单向生长, 第三相分布均匀;Ti含量在0.01%~0.02%之间, 其晶粒从单向生长转为多向生长, 组织形态变化较大, 随着第三相增加, 出现局部集中现象。随着Al含量增加, ZnAlSi系合金中第三相Si相从分布在富铝相和富锌相向富铝相区域集中。Ti元素对合金组织细化效果优于Si元素, 对合金组织影响较为显著。     

热处理煤矸石活性评价方法的研究

用X射线光电子能谱（XPS对热处理煤矸石中Si 2p，Al 2p和O 1s的结合能进行试验研究，发现煤矸石质硅铝基胶凝材料的强度和煤矸石中硅、铝的结合能具有线性关系，煤矸石的硅、铝结合能可以用来表征煤矸石的胶凝特性和活性.热活化煤矸石Si 2p，Al 2p和O 1s的结合能之间具有很好的相关性.基于此提出硅铝质物料活性评价的新方法--用Si，Al表面结合能评价硅铝质物料活性.     

Zr含量对Er变质Al7Si0.3Mg合金组织及力学性能的影响[1]

本文在Al7Si0.3Mg合金含0.3%Er的基础上研究了不同Zr含量对合金组织及力学性能的影响。研究结果表明,在添加Zr元素之后,Zr与Er形成了第二相颗粒Al3Er和Al3Zr,这些第二相粒子在铝液凝固过程中起到双重形核和细化作用,显著细化α-Al和共晶Si的分枝,提高了合金的力学性能。当Zr含量为0.2%时,其抗拉强度达到了182MPa,延伸率为6.4%,较未添加Zr元素的合金抗拉强度和延伸率分别提高了16.7%和33.3%。     

二次铝灰工艺矿物学特性研究

二次铝灰因成分复杂且含有毒害组分,物质组成及堪布特性不明限制了二次铝灰的无害化处置和有价组分的资源化利用。本研究利用XRF、XRD、激光粒度、SEM-EDS等对山东某铝电公司的二次铝灰进行了工艺矿物学特性研究。结果表明:二次铝灰中主要含Al、Mg、F、Si、K、N等元素,Al组分含量达到约84.933%;二次铝灰中主要含铝物相有Al_2O_3、金属Al、AlN、MgAl_2O_4等。AlN、金属Al、Al_2O_3含量分别为18.13%、12.41%、25.89%,总的铝物相含量为56.43%。二次铝灰粒度细,且分布不均匀,d(0.1)为1.058μm,d(0.5)为37.544μm,d(0.9)为264.882μm;含铝组分主要为氧化铝、尖晶石和铝锰合金;铝的氧化物主要以粒状存在且粒度较小,铝镁尖晶石组分以针状存在,部分以粒状、放射状存在;铝金属组分以游离颗粒单独存在,部分与锰铁组分紧密共生,以合金的形式存在。含氟组分浸染在铝镁组分中,铁和硅等微量组分以合金态集中存在于二次铝灰中,钾组分含量较低且与铝镁组分紧密共生。     

激光重熔对高硅Si/Al复合材料组织的影响

对加压渗流铸造方法制备的高硅Si/Al复合材料进行激光重熔处理,以消除微小疏松缺陷,细化Si颗粒以及改善其与铝基体的结合.高硅Si/Al复合材料经激光重熔处理后,熔凝层Si颗粒细化均匀,疏松缺陷消失,但有气孔存在.在激光电流120A、扫描速度50mm/min的重熔规范下,气孔较少,且主要分布在熔凝区中下部.随激光电流增大、扫描速度的减小,Si颗粒逐渐变小,硬度值逐渐增大.重熔区的硬度远高于热影响区和基体,热影响区硬度略低于基体.     

Al-P中间合金变质+半连续铸造技术制备过共品Al-17Si合金铸锭

采用Al-P中间合金变质+半连续铸造技术制备了初生硅细小且分布均匀的过共晶Al-17Si合金铸锭.结果表明,Al-P中间合金变质剂主要作用是改变合金中初初生硅的形貌,使其由板片状转变为近球状,细化初生硅.使用Al-P中间合金操作简单,变质效果好且稳定,使用该中间合金无渣,无污染,提高合金的实收率.从时间上看可以完全省去变质处理过程,节约能源,降低铝耗.     

硅灰碳热还原制备硅铁合金

为了进一步提高硅灰的经济价值并减少环境污染。本文首先对硅灰回收利用制备硅铁合金过程中可能发生的反应及其热力学可行性进行了研究,分析了炉内发生的反应过程,并将冶炼温度确定为1700℃。然后向硅灰中添加Fe粉及石油焦经碳热还原反应成功冶炼出Si含量为34.85%的硅铁合金。通过对产物检测分析得出合金成分主要是Fe和Si,合金成分均匀、结构清晰。为实现硅灰固废的回收利用提供了一条新的工艺路线,并证实了该工艺的可行性。     

高硅铝土矿正浮选两段脱硅试验研究

本文以云南鲁甸高硅低铝硅比型铝土矿为研究对象,通过正浮选阶段磨矿阶段选别、两段脱硅工艺流程获得了较好的铝土矿精矿,浮选指标良好。原矿含Al2O360.78%、Si O220.84%,铝硅比(A/S)为2.92,主要脉石矿物为白云母、石英等。通过在粗磨条件下进行一段浮选脱硅,粗精矿再磨再选后进行二段浮选脱硅,产出合格精矿。粗精矿再磨后进行五次精选,闭路试验获得精矿产率为64.74%、Al2O370.83%,Si O28.40%、A/S为8.43、Al2O3回收率为75.83%的良好指标。     

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     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

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     

2014 second batch of rare earth quota released

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