某铅锌矿高铅高PH值尾矿废水处理

针对某铅锌矿尾矿废水高Pb和高PH值的特点，研究添加硫钠沉淀－斜板沉淀箱澄清－砂滤池过滤－硫酸中和外排的废水处理工艺。尾矿水PH在12左右，含铅300－400mg/L，治理后的外排水PH在6－9，含铅＜1mg/L，均符合国家排放标准。     

降低湖南某多金属矿选矿废水COD试验研究

以两种途径研究了混凝沉淀法对湖南某多金属矿选矿废水COD去除的可行性。用聚合硫酸铁(PFS)、七水硫酸亚铁为水处理剂,分别在总尾矿矿浆和尾矿库出水中考察初始pH值,混凝剂种类及药剂用量等因素对选矿废水COD去除的影响。结果表明,在总尾矿矿浆中加入聚合硫酸铁1 g/L,COD由186降至121 mg/L,或在尾矿库出水中控制初始pH值为7～9,加入七水硫酸亚铁500 mg/L,COD由135降至88 mg/L。以第一种方案进行工业试验,取得了良好指标,排水pH值为6～9,COD 100 mg/L,达到污水综合排放标准(GB8978-1996)一级标准的要求。     

石灰-铁盐法处理硫酸厂高砷废水的研究与应用

采用石灰-硫酸亚铁两段净化工艺,对以硫铁矿为原料的硫酸厂含砷废水进行处理研究。介绍了pH值、Fe/As比以及充气量等条件对砷的去除率的影响。结果表明:控制一段pH=10 5、Fe/As=1∶1,二段pH=8 5、Fe/As=10∶1,充气20min,沉淀1h,处理后外排废水中砷浓度小于0 5mg/L,达到国家排放标准。该方法处理费用低、工艺简单可行、操作方便,已在工业生产中应用。     

高浊度矿井水处理技术研究

为实现矿井水资源化,解决高浊度矿井水回用处理,分析了高浊度矿井水的水化学特性,通过混凝沉淀烧杯搅拌试验,研究了混凝剂种类、投加量、pH值、搅拌速度及时间对混凝效果的影响,结果表明:PAC为5mg/L,PAM为0.4mg/L,pH值为7,混合转速为120r/min,混合时间为0.5min,反应转速为50r/min,反应时间为25min,对应的混合G值为28.9s-1、GT值为867,反应G值为7.3s-1、GT值为10950时,混凝沉淀效果最好。     

提高某铅锌矿尾矿浆浓缩脱水效果的研究

某铅锌矿因受尾矿输送设备能力的限制,需对选矿尾矿进行浓浆输送。生产上添加聚丙烯酰胺（PAM）或石灰可解决浓缩问题,但PAM使尾矿浆在尾矿库内难以形成千滩而对尾矿坝的稳定性产生不利影响,石灰则使尾矿库外排水pH值严重超标。为此,通过沉降试验对PAM、石灰、聚合硫酸铁（PFS）、明矾、聚合氯化铝（PAC）等沉降剂进行了比较,发现PFS与石灰组合可获得较好的尾矿沉降效果。在此基础上进行了实验室动态浓缩试验,结果表明,采用混合沉降剂PFS＋石灰,可获得底流浓度40％以上、溢流水中固体悬浮物含量低于200mg／L的沉降指标,并可解决尾矿库外排水pH值超标的问题。因此,以PFS＋石灰作为混合沉降剂是解决该矿尾矿浓缩问题的适宜方案。     

某铀矿尾矿堆场受污染地下水的渗透反应墙修复初探

渗透反应墙是一种原地修复受污染地下水的新型技术,具有发展前景。在某矿铀尾矿堆场退役治理过程中采用了该技术进行受污地下水的工程应用。综述了该尾矿堆场污染地下水渗透反应墙的修复机理、设计施工及实际应用效果。在尾矿堆场下游末端安装渗透反应墙后,尾矿渗出水的pH由2.71上升至6.85,ρ(U)由12.21 mg/L降至0.003 mg/L;在受纳尾矿堆场渗漏水受纳河的入口下游50 m处,河水pH由渗透反应墙安装前的3.65上升到安装后的7.50,ρ(U)由渗透反应墙安装前的0.46 mg/L下降到安装后的0.001 mg/L。     

基于《水处理工程》的酸性高铁矿井水综合实验设计

菱镁矿尾矿煅烧后产生的轻烧镁粉对于酸性矿井水的处理具有效果好、操作条件良好、沉渣少等优点。通过对轻烧镁粉的成分分析可知,主要成分氧化镁占比高于90%。以山西某煤矿酸性矿井水为研究对象,对其进行常规水质分析可知,总铁浓度为230.01mg/L、亚铁离子浓度为66.98mg/L、pH值为3.24。采用轻烧镁粉进行酸性矿井水处理,设计正交实验,分析初始pH值、药剂投加量、曝气量、曝气时间等对处理效果的影响。实验结果表明,在投加轻烧镁粉量为0.50～1.00g/L时,酸性矿井水初始pH值可由3.15～3.31提高到6～9左右,缓冲性能较好,较容易控制投加量使pH值控制在6～9;轻烧镁粉处理酸性矿井水时三个主要因素的影响程度大小为:投加量搅拌时间搅拌速度,当轻烧镁粉投加量为0.85g/L、搅拌速度为400r/min、搅拌时间为12min时,实验效果较好;利用轻烧镁粉提高酸性矿井水的pH值到7.48时,曝气5min,曝气量为0.5m3/h,聚合氯化铝(PAC)投加量为10mg/L时,经处理矿井水中亚铁离子和总铁浓度可分别降至0.07mg/L和0.17mg/L,满足排放或回用水对总铁的要求,且改善了沉渣的沉降性能,大大缩短了沉降时间。     

含镍料液中硝酸铵和硝酸镍的分离研究

以分离并回收含镍料液中的硝酸铵和硝酸镍为目的,验证了纳滤和硫化铵沉淀联用技术的可行性,并通过考察纳滤浓水侧压力、纳滤级数、硫化铵沉淀pH值等的影响,获得适宜的工艺路线为：两级纳滤+KLNi-01离子交换除镍+硫化铵沉镍+硝酸溶解回收硝酸镍。操作参数如下：纳滤进水pH=6、浓水侧压力0.8 MPa,经两级纳滤后,产水镍含量降至0.181 g/L,再经KLNi-01树脂吸附后,镍含量降至0.002 mg/L;纳滤浓水在初始pH=6、硫化铵溶液加入量36 mL/L条件下沉镍,此时出水镍含量4.7 mg/L,无硫化物检出;使用硝酸溶解硫化镍沉淀,可获得浓度为258.40 g/L的硝酸镍溶液。物料衡算可得：处理1 m³含镍料液,获得产水0.3 m³,消耗20%～26%的硫化铵溶液25.20 L,消耗浓硝酸37.22 L,消耗水体积109.05 L,可获得258.40 g/L的硝酸镍溶液192.93 L。     

脱稳和混凝法处理某多金属矿尾矿废水试验研究

以某多金属矿尾矿废水为试验对象, 根据废水特征进行了脱稳效果比较, 分别选用不同的絮凝剂进行了混凝试验。实验结果表明, 选用石灰作为脱稳剂, 加入石灰量使废水pH值达到11.5时, 脱稳沉淀效果最好。选用阳离子型聚丙烯酰胺絮凝剂, 在pH值为8～9时, 投加量为2 mg/L, 经处理的废水达到国家排放标准。     

NH4HCO3沉淀法制备优质铀浓缩物的研究

描述了以碳酸氢铵为沉淀剂从酸性硝酸铵淋洗合格液中沉淀铀的反应机理,探索了温度、pH值、加料速度、搅拌强度、浆体返回次数对沉淀产品的影响。在温度60℃、pH5 6～5 8时,ρ(NH4HCO3)为150g/L。恒pH连续沉淀,在100℃下维持10min驱除CO2,沉淀母液中ρ(U)<10mg/L,产品中w(U)在70%左右,w(SO42-)为0 65%,w(H2O)为25 2%,优于1998年颁布的一级品标准。     

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