复杂烟尘高效浸出铟的工艺研究

以某公司复杂含铟烟尘为原料, 分别研究了氧化酸浸和硫酸化焙烧-水浸两种浸出铟工艺。氧化酸浸工艺主要考察了初始硫酸酸度、液固比、浸出温度、反应时间、氧化剂添加量等因素对铟浸出效果的影响; 硫酸化焙烧-水浸工艺主要考察了硫酸用量、焙烧温度、焙烧时间等因素对铟浸出效果的影响。实验结果表明, 在初始硫酸浓度6.0 mol/L, 液固比6∶1, 浸出温度90 ℃, 浸出时间3 h, 氧化剂H₂O₂添加量为12%条件下进行氧化酸浸, 铟浸出率由常规酸浸的46.5%提高到70%; 在硫酸用量1.0 mL/g, 焙烧温度300 ℃, 焙烧时间2 h条件下进行硫酸化焙烧-水浸, 铟浸出率达到92%, 实现了铟的高效浸出。     

高岭土制备聚合氯化铝及处理洗煤废水的研究

利用煤系高岭土酸浸液,采用水浴加热的方法,制备了聚合氯化铝(PAC),优化工艺条件为:Al³⁺浓度为0.50 mol/L,pH值为0.50,聚合温度为70℃、聚合时间为3.0 h,室温熟化24 h。采用制备的PAC处理洗煤废水,获得了处理800 mL洗煤废水的优化条件为:pH值为7.0,质量分数1%的PAC溶液用量为5 mL(62.5 g/m³废水),沉降时间为40 min。结果表明,采用煤系高岭土酸浸液制备PAC,并将PAC用于处理洗煤废水可行,洗煤废水去浊率达98%以上。     

聚硅硫酸铁絮凝剂的制备和性能研究

无机高分子絮凝剂作为一类新型水处理剂近年来得到了快速发展。采用硅酸钠、硫酸铁等为原料,制备了聚硅硫酸铁(PFSS)絮凝剂,并以印染废水为对象对其絮凝效果进行了研究。主要考察了SiO2浓度、Fe/Si物质的量比、聚硅酸(PS)活化时间、聚硅酸(PS)与聚硫酸铁(PFS)聚合温度、聚合pH值等因素对产品絮凝性能的影响。结果表明,在SiO2浓度为1.0%、Fe/Si物质的量比为0.5、聚硅酸(PS)活化时间为3 h、聚硅酸(PS)与聚硫酸铁(PFS)聚合温度为60℃,聚合pH值为1.5条件下制备的聚硅硫酸铁对废水絮凝效果最好,浊度脱除率达到88.9%,废水的COD去除率达到80.9%。     

石煤硫酸浸出过程中含钒矿物的浸出行为

以陕西省商南县石煤钒矿为研究对象,研究了直接酸浸、氧化酸浸及活化酸浸的提钒效果,分析了酸浸过程中含钒矿物钒的浸出规律和活化浸出机理。结果表明：在硫酸浓度250 g/L、液固比5 mL/g、温度90℃条件下,浸出12 h,钒浸出率仅为48.55%;在相同条件下,加入3%氯酸钠,氧化酸浸9 h,钒浸出率增加到61.42%;再添加9%氟化钙,仅活化浸出6 h,钒浸出率可达到92.90%。工艺矿物学研究表明：在活化酸浸过程中,氟化钙与硫酸反应生成的氢氟酸,促进了硫酸对含钒矿物结构的破坏,同时参与了含钒云母的反应,促进了含钒矿物中钒的浸出;矿物中含钒云母、钒钛矿、褐铁矿、钒硫化物中钒的浸出率分别为98.47%、42.22%、98.09%、89.70%,与氧化酸浸相比,分别增加了31.77、26.90、18.01、89.70个百分点。     

酸改性粉煤灰的制备及其降解选矿废水COD研究

由于粉煤灰中含有大量的无定形相玻璃体,因此可用于选矿废水COD的降解。粉煤灰改性试验结果表明在酸改性法、碱改性法和盐改性法中,酸改性粉煤灰法效果最好。酸改性法的较佳工艺参数为:硫酸浓度1.0 mol/L、液固比3:1、酸化温度50℃、酸化时间90 min。在优化工艺下制备酸改性粉煤灰,用其降解选矿废水COD,试验条件为酸改性粉煤灰20 g/L、Fe2+1.5 mmol/L、H2O2 9.5 mmol/L、反应40 min,COD去除率可达90%以上,降解后废水符合排放标准。     

利用油页岩渣制备氧化铝和白炭黑

以油页岩渣为原料, 分别用酸浸法和碱溶法制备了氧化铝和白炭黑。讨论了焙烧活化作用、酸浸温度、盐酸用量以及酸浸时间等对氧化铝提取率的影响。实验结果表明, 油页岩渣不需活化可以直接采用酸浸法制备氧化铝,最佳工艺条件为: 酸浸温度100 ℃、酸浸时间2.0 h、盐酸/油页岩＝40.0 mL/15.0 g; 氧化铝提取率为90.6%, 纯度为91.7%。探讨了反应温度、反应时间以及碱浓度等对白炭黑提取率的影响,最佳工艺条件为: 反应温度100 ℃、反应时间6.0 h、NaOH浓度为6 mol/L; 白炭黑提取率为80.5%, 纯度为95.9%。灰渣剩余量不到原来的5%, 达到了油页岩渣生态化利用的目的。     

河北某石英砂除杂工艺研究

对河北某石英砂进行工艺矿物学分析,按照"擦洗-煅烧水淬-磁选-酸浸"工艺流程进行除杂试验,探究擦洗时间、煅烧温度、煅烧时间、酸浸温度、酸浸时间各因素对石英砂除杂效果的影响,从而确定最佳试验参数。结果表明,采用"擦洗-煅烧水淬-磁选-酸浸"工艺,最佳试验条件为:擦洗时间15 min,煅烧温度900℃,煅烧时间2.0 h,酸浸组合"3 mol/L HCl+1 mol/L HF+1 mol/L HNO3",酸浸液固质量比3︰1,酸浸温度80℃,酸浸时间6.0 h,Si O2纯度由99.18%提高至99.90%,杂质总含量由7 723.98μg/g下降至789.59μg/g,主要杂质中Al去除率为92.2%,Fe去除率为95.9%。     

硅藻精土酸浸-煅烧增白工艺与性能表征

以经过物理选矿处理后的硅藻精土为原料,采用硫酸酸浸和煅烧进行增白工艺研究。探讨了酸浸温度、酸浸时间、硫酸浓度、液固比对硅藻土增白效果的影响,并对酸浸增白硅藻土样品的白度、化学成分、矿物成分及颗粒形貌等进行了表征。结果表明,硅藻土酸浸增白的适宜工艺条件是:酸浸温度98℃、酸浸时间4 h、硫酸浓度5 mol/L、液固比2.5∶1(m L/g)、煅烧温度600℃、煅烧时间2 h;酸浸处理能有效去除黏土类矿物和石英、长石等杂质,煅烧能有效去除有机质;经过增白处理,硅藻土白度从41.8%提高到80.6%,二氧化硅含量从82.11%提高到93.78%。     

钛铁矿制备纳米钛基材料的研究

以廉价易得的天然钛铁矿为原料,采用"机械球磨活化+碱浸"工艺制备FeTiO_3纳米花,采用"机械球磨活化+碱浸+酸浸"工艺制得TiO_2/FeTiO_3纳米微粒。首先通过机械球磨活化减小钛铁矿的物理尺寸,使其化学性质变得活泼,然后通过碱浸的方法得到呈三维花瓣状的FeTiO_3纳米花,最后纳米花进一步酸浸得到规则的TiO_2/FeTiO_3纳米微粒。通过分析FeTiO_3纳米花和TiO_2/FeTiO_3纳米微粒的形貌和物相组成,得出结论碱浸时较优的NaOH浓度为1mol/L,碱浸时间为2h,酸浸时较优的HCl浓度为2mol/L,酸浸时间为8h。较优条件下获得的FeTiO_3纳米花厚度在25nm左右,长度在200～400nm之间,TiO_2/FeTiO_3纳米微粒直径在30nm左右。通过分析碱浸和酸浸的机理,可知反应过程中都有不稳定液相中间产物的生成,运用溶解和中间体水解产生沉淀的机理进行了解释,中间体的生成和水解平衡受酸或者碱浓度的影响。     

某含铜金精矿预处理过程中铜、铁浸出研究

研究"硫酸化焙烧—酸浸—氰化"和"L-SX-EW"联合工艺处理含铜金精矿过程中,焙烧温度、酸浸酸度对铜、铁浸出率和酸浸液中Fe~(3+)浓度的影响。结果表明,在硫酸化焙烧温度为650℃、焙烧时间1 h、初始酸浸酸度40 g/L、浸出液固比3∶1、浸出温度85℃、浸出时间1 h条件下,铜、铁的浸出率分别为大于96%、21%,酸浸液中的Fe~(3+)浓度2.87 g/L。表明在不改变原有工艺的基础上通过调整焙烧温度和酸浸酸度两个关键工艺参数,可以达到提高铜浸出率的同时兼顾降低Fe~(3+)浓度的目标。     

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