碱融—水浸法从高温合金废料中回收铼

研究用碱融—水浸法分离高温合金废料中铼的过程及工艺参数,考察碱融坩埚、碱融时间、碱融温度、水浸温度以及NaOH和钠盐加入量等因素对铼在碱融—水浸后回收率的影响。结果表明,选用致密的Al2O3坩埚,合金粉料与所加入NaOH和钠盐总和的质量比为1∶2时,在900℃下碱融60min,水浸温度70⁹0℃,浸出液中铼的回收率能够达到93.78%。其中所加入的钠盐为Na2CO3和Na2SO4,质量比为w(NaOH)∶w(Na2CO3)∶w(Na2SO4)=6∶1∶3。     

钾长石的绿色化综合利用工艺

针对辽宁某地钾长石的特点,设计了一条绿色化综合利用工艺流程。采用Na2CO3中温焙烧,在较低温度下破坏钾长石的结构。碱溶焙烧熟料得到Na2SiO3溶液和K、Na、Al的富集渣。碳分Na2SiO3溶液制取白炭黑。酸化K、Na、Al的富集渣,经水浸、过滤得到白炭黑和含K、Na、Al的溶液。Na2CO3沉铝得到Al(OH)3与K、Na分离。Na2SO4、K2SO4循环至一定浓度后分步结晶得到Na2SO4和K2SO4晶体。可采用CO还原Na2SO4制得Na2S。整个工艺流程实现了Si、K、Na、Al的综合利用,无废弃物排放。     

硫代硫酸盐法回收某金矿废水池污泥中金的研究

在NaOH、Na2SO3的协同作用下，探索了硫代硫酸盐法回收某金矿废水池污泥中金的条件。通过单因素和正交试验得出：在反应温度50-55℃，反应时间3h,试剂与干污泥的最佳质量比为：Na2S2O3·5H2O 72．1％，NaOH 11.3％，Na2SO3 11.3％，此时浸金率可达90．1％以上。     

从废催化剂中回收钒和钼的实验研究

针对一种含钒、钼的废催化剂,进行了碱式焙烧-水浸的实验研究。研究结果表明,碱式焙烧-水浸的最优条件为：焙烧温度700°C、碳酸钠添加量40%、焙烧时间120 min、浸出温度90°C、固液比0.20 g.mL_-1、浸出时间90 min和搅拌速度400 r.min_-1。进行三种不同方法的对比实验研究：碱式焙烧-水浸工艺;氧化焙烧-碱浸工艺;常压碱浸工艺。处理含钒、钼的废催化剂,最佳的工艺为碱式焙烧-水浸工艺,此时,钒和钼的浸出率分别可以达到97.61%和97.33%。     

从某高温合金酸浸渣中回收钨的研究

以某高温合金酸浸渣为原料, 利用碱焙烧-水浸-离子交换-结晶工艺回收钨制备仲钨酸铵。考察了焙烧温度、焙烧时间、碱用量、水浸温度及水浸时间等因素对钨回收率的影响。实验得出最佳碱焙烧-水浸工艺条件为: 焙烧温度700 ℃、焙烧时间60 min、碱用量为酸浸渣质量的80%、水浸温度85 ℃、水浸时间60 min, 在此条件下, 富钨渣中钨回收率可达99%以上。将焙烧-水浸液稀释后, 采用201×7树脂在流速为5 cm/min的条件下进行吸附, 吸附完毕后使用5 mol/L NH₄Cl+2 mol/L NH₃·H₂O进行解吸, 解吸流速为吸附流速的1/2, 取解吸高峰液进行结晶, 当结晶率80%时仍可得到合格的仲钨酸铵产品。     

石棉尾矿加碱焙烧去非金属氧化物作用研究

以石棉尾矿为原料,将其与氢氧化钠经混合焙烧、水浸得到焙烧水浸产物。考察主要工艺条件NaOH与SiO2摩尔比、焙烧反应温度和焙烧反应时间等对焙烧产物及焙烧水浸产物的影响,结合物相、结构变化等探讨去非金属氧化物作用过程和作用机制。结果表明,加碱焙烧的优化工艺条件为:n(NaOH)∶n(SiO₂)摩尔比为4.0,反应温度为600℃,反应时间为2 h,此条件下加碱焙烧去非金属氧化物作用明显,水浸渣中主晶相均为氧化镁。当焙烧温度大于255℃时,随焙烧温度的升高,镁氧八面体片发生脱水,硅氧四面体结构破坏,形成可溶的硅酸镁钠;当焙烧温度为830℃时,硅酸镁钠由可溶物质转变为难溶物质。     

采用添加剂预焙烧活化-熟化工艺从石煤中提钒工艺研究

针对新疆某地沉积泥质岩型钒矿,以其重选精矿为试验原料,分别以K2SO4、Na2SO4和CaSO4三种硫酸盐作为预焙烧活化添加剂,在添加剂预焙烧活化处理后进行浓酸熟化工艺,并优化了添加剂预焙烧活化处理浓酸熟化的工艺技术条件。研究结果表明：采用添加剂预焙烧-浓酸熟化工艺可有效降低酸用量,提高钒浸出率。采用K2SO4和Na2SO4作为添加剂进行预焙烧活化具有相同的工艺参数,在添加剂用量为4%,预焙烧温度为750℃,预焙烧时间为30 min,熟化时水用量为矿样质量的20%,酸用量为矿样质量的20%,熟化温度120℃,熟化时间3 h,采用K2SO4作为添加剂的钒浸出率为90.99%,采用Na2SO4作为添加剂的钒浸出率为90.36%。采用CaSO4作为添加剂适宜的工艺参数为：添加剂用量10%,预焙烧温度800℃,预焙烧时间30 min,熟化时水用量为矿样质量的20%,酸用量为矿样质量的20%,熟化温度120℃,熟化时间3 h,此时钒浸出率为84.01%。     

从HDS废催化剂中提取钒和钼的研究

用加碱焙烧—水浸取法从加氢脱硫 (HDS)废催化剂中提取钒和钼。实验结果表明 :当废催化剂平均粒径小于 0 .0 6 0 80 mm,原料摩尔比为 Na2 CO3 / (V+ Mo) =2 .0 ,在温度 112 3K下焙烧2 4 0 min,钒和钼的焙烧浸取收率都可达 90 %以上     

含铂族金属铁合金碱焙烧脱硅预处理研究

针对含铂族金属铁合金结构复杂、难以溶解的问题，开展碱焙烧脱硅预处理研究以破坏稳定致密的合金结构。经试验验证，适宜的焙烧条件为：碱料质量比1.4、焙烧温度600℃、焙烧时间2 h，此条件下合金相完全分解，转化为NaFeO2和Na4SiO4，Na4SiO4经水浸脱除，所得水浸渣中硅含量降至0.84%。脱硅预处理后物料结构疏松、活性较高，易于酸溶除铁，有利于铂族金属精炼回收。     

碱酸法提纯某微晶石墨

碱酸工艺是当前提纯微晶石墨的主流工艺。为确定固定碳含量为85%、粒度为0.048~0 mm、主要杂质为SiO2、Al2O3、Fe2O3等的湖南某微晶石墨提纯的合适碱酸工艺参数,对NaOH的用量、焙烧温度、焙烧时间以及HCl的用量进行了试验。结果表明,适当提高NaOH的用量、焙烧温度、焙烧时间以及HCl的用量均有利于提高微晶石墨提纯产品的固定碳含量,在NaOH与试样的质量比为0.6,焙烧温度为600℃,焙烧时间为60 min,HCl与试样体积质量比为0.4 mL/g的情况下,可获得固定碳含量为98.79%的提纯产物。     

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     

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.     

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     

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     

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.