难免金属离子对白钨矿浮选的影响

通过单矿物浮选试验、溶液化学分析、表面动电位分析以及捕收剂吸附量测试等表明,在pH=8.5弱碱性矿浆中,难免金属离子Fe~(3+),Mg~(2+),Ca~(2+)均会对白钨矿的浮选产生抑制作用;Ca~(2+)和Mg~(2+)主要以阳离子的形式吸附在白钨矿表面,Fe~(3+)主要以负电性的Fe(OH)_3(s)吸附在白钨矿表面,并且Fe(OH)_3(s)胶体与水玻璃和捕收剂TA-3在白钨矿表面形成了电负性更大的化合物,影响TA-3在矿物表面的静电吸附.Fe~(3+)对白钨矿可浮性的抑制程度明显强于Ca~(2+)和Mg~(2+).     

锌离子对微细粒石英浮选活化的影响研究

通过纯矿物浮选试验、Zeta电位测试、浊度测试、红外光谱测试以及Zn~(2+)溶液水解平衡计算,系统研究了Zn~(2+)对微细粒石英可浮性的影响及其作用机理。结果表明:微细粒石英纯矿物在油酸钠体系下基本不可浮,Zn~(2+)作用后的石英在pH=9~11时的浮选性能最佳。Zn~(2+)主要是以Zn(OH)_2沉淀的形式吸附于微细粒石英表面并促进其聚团,油酸根离子可能与石英表面Zn(OH)_2发生反应生成了油酸锌,从而促进了石英的上浮。     

某铀尾矿库下游地下水中U形态特征研究

以某铀尾矿库下游地下水为研究对象,分析该地下水水化学成分的基础上,采用PHREEQC软件模拟在不同pH值、pe值条件下U赋存形式及饱和指数(SI)间的变化关系。结果表明:研究区地下水中U主要以UO_2(CO_3)_3~(4-)、UO_2(CO_3)_2~(2-)、UO_2CO_3、(UO_2)_2CO_3(OH)_3~-、UO_2(OH)_2、UO_2(OH)_3~-等形态存在,其中UO_2(CO_3)_3~(4-)所占比例最大,平均高达87.64%。pH值是影响铀存在形态的重要因素,UO_2CO_3在pH=5时含量最高,在pH>5后,UO_2CO_3、UO_2SO_4和UO_2~(2+)含量逐渐下降;UO_2(CO_3)_2~(2-)在pH=6时达到峰值后随pH值增加而递减,在pH>6后具有高络合常数的UO_2(CO_3)_3~(4-)占绝对优势。随着pe值的增加,U~(6+)摩尔浓度不变,而U~(4+)浓度增加。SI结果显示,在该研究区水文地球化学背景下,随着pH值、pe值的改变,地下水中的UO_2SO_4、UO_2CO_3、UO_2(OH)_2均处于溶解状态。     

钛铁矿与捕收剂SYB~(2#)的作用机理探究

本试验以攀枝花的选铁尾矿作为试验原矿,采用SYB~(2#)(一种羟肟酸类药剂)为捕收剂进行浮选试验。结果表明,在SYB~(2#)用量为733.33 mg/L,pH为5.0(H2SO4和NaOH为调整剂)的条件下,钛铁矿回收率达到最大值81.9%。通过SEM-EDS、XPS和Zeta电位分析等测试手段探究了捕收剂SYB~(2#)与钛铁矿之间的作用机理。EDS能谱元素半定量分析结果表明,O原子浓度由47.83%上升到56.77%,C原子浓度由27.60%下降到20.93%,说明SYB~(2#)在矿物表面产生了吸附作用;由XPS分析发现,O、Ti和Fe的化学位移分别为0.26e V、0.14eV和0.18eV,说明SYB~(2#)与这些元素均发生了作用;Zeta电位分析表明,矿浆pH值高于零电点时,羟肟酸根离子仍可吸附在矿物表面,同时钛铁矿回收率在零电点附近达到最大值(此时矿物表面因吸附Fe(OH)~+、Fe(OH)_3~-、Ti(OH)_4等离子而不显电性),说明SYB~(2#)与钛铁矿之间的作用应为化学吸附。结合相关研究及本文XPS分析,在以H_2SO_4作调整剂的情况下,可能还存在SO_4~(2-),HSO_4~-对矿物的特殊吸附。     

酸性条件下十二胺体系中Fe~(3+)对白云母可浮性的影响

通过单矿物试验、溶液化学计算、动电位测试、红外光谱分析以及XPS分析,研究了在酸性条件下十二胺体系中Fe~(3+)对白云母的抑制作用机理。结果表明,浓度为3×10-3mol/L的Fe~(3+)可使白云母的零电点从1.6增加到2.4。在pH=4时,随着Fe~(3+)浓度的增大,白云母动电位正向移动。十二胺在白云母表面的吸附状态为物理吸附。Fe~(3+)在白云母表面产生静电吸附,并以Fe(OH)_3沉淀的形式罩盖在白云母表面并减少白云母表面暴露的Si原子数目,导致十二胺在白云母表面的吸附量减小从而抑制白云母的浮选行为。当Fe~(3+)的浓度为1×10-3mol/L时,可使白云母的回收率降低12%。     

黑钨矿浮选金属阳离子活化机理研究

采用ζ-电位测定、吸附测定和浮选试验研究了黑钨矿的浮选性质。研究证明,所研究的黑钨矿在纯水中表面电位为-10毫伏;在用盐酸或氢氧化钠调整的pH值范围(2.9～11.5)其表面均荷负电,表面荷负电的原因可能是由黑钨矿结晶构造特征所决定的。多价金属阳离子Fe~(3 )、Pb~(2 )、Cu~(2 )、Mn~(2 )离子可以活化黑钨矿浮选,它们对黑钨矿的活化机理可能是由于在水中能水解生成氢氧络离子,其中Fe(OH)~(2 )、Pb(OH)~ 、Cu(OH)~ 和Mn(OH)~ 等是黑钨矿的活化成分;它们通过与黑钨矿表面作用分离出水而吸附于矿物表面。吸附于矿物表面的金属阳离子较难解吸,从而表明这种吸附可能是以化学吸附占优势。     

文摘与简讯

硫酸根在氢氧化铁(Ⅲ)浮选中的作用在 Fe(OH)_3浮选时,200毫升溶液中,存在20毫克 SO~(2-)_4,于 pH 为4～7的条件下,对 Fe(OH)_3沉淀物(相当5毫克铁)形成絮凝是有效的。在该溶液中有痕量的 Se(Ⅳ)、Sn(Ⅱ)、Su(Ⅳ)、Sb(Ⅲ)Sb(v)以及Bi(Ⅲ)能被定量地捕收。使用1毫克阴离子表面活性剂(十二烷基硫酸钠),在乙醇存在下,通氮气泡流(气泡直径0.5毫米)10分钟。不存在 SO_4~(2-)的情况下,在 pH 4～7范围内形成的 Fe(OH)_3胶体,将不能大量浮游。     

含镍废液制备硫酸镍并深度除Fe、Cu、Zn

本文以镀镍行业产生的含Fe、Cu、Zn等杂质的硫酸镍废液为原料,通过采用氧化、化学沉淀、P204多级萃取等低成本的方法,实现了Fe、Cu、Zn等主要杂质的深度去除,制备出符合HG/T 2824-2009中Ⅰ类一等品的硫酸镍产品。试验重点考察了双氧水用量用量对除铁的影响,以及中和pH值、萃取pH值、萃取相比等技术参数对Fe、Cu、Zn、Ni除杂率的影响,并按照最佳条件处理了一批10 L废液得到2300 g硫酸镍产品,一次结晶率达60%。试验结果表明:用双氧水氧化后石灰中和至pH值5.0,Fe离子沉淀完全;在中和终点pH值4.5~5.7范围内,Fe、Cu、Ni的沉淀率随pH值的增大而增大,Zn的变化不大;pH值达5.7,Cu的沉淀率达98.4%;P204对金属离子的萃取顺序为:Fe3+Zn~(2+)Cu~(2+)Fe~(2+)Ni~(2+);P204可有效萃取分离Fe、Cu、Zn等杂质;经萃取分离后硫酸镍溶液中Fe、Cu、Zn的含量全部达到10-3g/L以下。     

铁离子和铅离子对白钨矿与石英浮选的影响及机理研究

通过浮选试验和浮选溶液化学计算研究了铁离子和铅离子对白钨矿与石英浮选的影响。结果表明,油酸钠捕收剂时,在pH=6~10范围内铅离子对白钨矿与石英浮选的影响较小,而铁离子对石英的活化能力明显强于白钨矿,不利于白钨矿与石英的分离;当pH=10~11.0时,铅离子和铁离子对白钨矿与石英可浮性的影响逐渐减弱;当pH=11.0时铅离子对白钨矿有抑制剂作用,不利于白钨矿与石英分离,而铁离子基本不影响白钨矿与石英的浮选分离。浮选溶液化学计算表明,Fe(OH)_3(S)与油酸钠反应所对应的pH范围决定了白钨矿与石英被活化的pH区间,而Pb~(2+)离子、Pb(OH)~+离子以及Pb(OH)_2(S)则是铅离子活化白钨矿和石英的主要原因。     

萃取法测定六氟乙酰丙酮与Tm~(3+)的配合常数及水解常数

本文采用萃取法测定了螯合萃取剂六氟乙酰丙酮(HHFAa)在1mol/LNaClO_4介质及甲苯中的分配常数logK_d=-1.80。并采用图解法求得HHFAa与Tm~(3+)萃取反应的累积配合常数:logβ_(110)=2.19、logβ_(120)=3.74、logβ_(130)=4.99。且得到加合物Tm(HFAa)_3(HHFAa)的配合常数logK_(add)=2.20。Tm~(3+)水解形成水合物Tm(OH)~(2+)、Tm(OH)_2~+、Tm(OH)_3和Tm(OH)_4~-的累积常数分别为logβ_(101)=8.23、logβ_(102)=13.97、logβ_(103)=18.05和logβ_(104)=21.73。其混合配合物Tm(HFAa)_2(OH)和Tm(HFAa)(OH)_2的累积常数logβ_(121)=7.68和logβ_(112)=11.93。     

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     

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