新型酰胺基羧酸捕收剂DWD-1用于铁矿反浮选试验研究

为了解决选厂使用脂肪酸阴离子捕收剂时药剂用量大、浮选温度高等问题,东北大学浮选药剂课题组研发了一种新型改性脂肪酸类常温捕收剂DWD-1.在25 ℃温度下反浮选鞍千矿业公司现场混合磁选精矿,捕收剂DWD-1用量仪200g/t,活化剂CaC12用量仅为200g/t,经l粗1精1扫的闭路浮选脱硅,可获得精矿铁品位68.19%、回收率90.03%、尾矿铁品位12.95%的良好指标.与现场捕收剂RA-715在温度40℃、用量为530g/t、活化剂CaC12用量600 g/t、1粗1精3扫的闭路浮选指标相比,捕收剂DWD-1精矿铁品位提高了0.18%,回收率提高了 2.69%,尾矿品位降低了 3.09%.因此捕收剂DWD-1用作鞍千混合磁选精矿反浮选脱硅捕收剂能较大程度减少药剂用量,简化浮选流程,并获得更好浮选指标.     

反浮选铁尾矿正-反浮选再选研究

通过正-反浮选联合流程对取自齐大山选矿厂的反浮选尾矿进行了再选试验研究,结果表明,以2,4-二羟基苯甲酸为石英抑制剂、油酸钠为捕收剂,在不加pH值调整剂的条件下,当抑制剂用量为800 g/t、捕收剂用量为550 g/t时,正浮选5 min后,粗精矿中铁的回收率可达78.85%,品位为31.86%。正浮选粗精矿反浮选试验结果表明,当磨矿细度达到95.50%-0.045 mm 时,经过1次粗选、2次精选,1次扫选,可获得精矿铁品位66.17%,铁回收率27.64%的分选指标。     

辽宁某铁矿低温捕收剂浮选工艺试验研究

辽宁某铁矿石选矿厂的弱磁—强磁混合磁选精矿的TFe品位为53.92%,主要铁矿物以磁/赤铁矿的形式存在,主要脉石矿物为石英。该选矿厂现场采用TD-Ⅱ捕收剂进行反浮选,但浮选矿浆温度为40℃,导致资源浪费,为提高生产指标,使用东北大学自主研发的新型含多极性基低温捕收剂DZ对该选厂的混合磁选精矿进行反浮选试验研究。试验考察了捕收剂DZ用量、矿浆pH值、浮选温度、淀粉用量、CaO用量对混合磁选精矿的浮选行为的影响。针对TFe品位为53.92%的混合磁选精矿,采用新型低温捕收剂DZ在浮选温度15±2 ℃、矿浆pH值9、抑制剂淀粉用量700 g/t、捕收剂DZ用量150 g/t,不添加活化剂的条件下,经过“一粗二精三扫”的浮选闭路试验,可得到TFe品位65.24%、铁回收率93.03%的浮选精矿指标。采用捕收剂TD-Ⅱ在浮选温度40±2 ℃、矿浆pH值11,淀粉用量1000 g/t,CaO用量900 g/t,捕收剂TD-Ⅱ用量250 g/t的条件下,经过“一粗一精三扫”的浮选闭路试验,可得到TFe品位65.47%、铁回收率90.71%的浮选精矿指标。对新型低温捕收剂DZ以及现场药剂TD-Ⅱ体系所得浮选闭路的精矿进行产品检查,通过浮选结果与产品检查对比可发现,新型低温捕收剂DZ是一种高效、选择性高的低温浮选捕收剂,能有效解决选矿厂在反浮选过程中的能源浪费问题,节约选矿成本,提高资源利用效率。     

新型捕收剂DWD-3用于司家营 一期混磁精反浮选脱硅

铁矿选矿厂使用脂肪酸类阴离子捕收剂反浮选铁矿物,存在捕收剂用量大、所需浮选温度高、浮选指标差等问题。东北大学研发了一种新型酰胺基羧酸捕收剂DWD-3,并应用于司家营混磁精反浮选脱硅。实验室试验结果表明,在浮选温度为25 ℃,粗选矿浆pH=11.5、DWD-3用量为400 g/t、CaCl2用量为400 g/t、玉米淀粉用量为 1 000 g/t时,经1粗1精3扫闭路反浮选,能获得精矿铁品位66.48%、回收率80.32%,尾矿铁品位16.35%的指标。以捕收剂DWD-3代替现场捕收剂GK-68可使浮选温度由40 ℃降至25 ℃,并且精矿铁品位提高了0.39个百分点、回收率提高了2.23个百分点,尾矿铁品位降低了1.57个百分点。对浮选产品分析表明,精矿中存在20 μm以下的紧密连生体;尾矿中有大量较大颗粒连生体,且连生体中铁矿物与脉石部分相互浸染连生,是尾矿铁品位较高的原因。     

新型耐低温捕收剂BK427在赤铁矿反浮选脱硅中的应用

采用自制的耐低温型阴离子脂肪酸类捕收剂BK427,对齐大山磁选精矿进行了反浮选试验研究,研究结果表明：碱用量3.0kg/t,淀粉用量1.0 kg/t,氧化钙用量500g/t,捕收剂BK427用量400g/t,矿浆温度10~15℃时,采用一步粗选,可获得铁精矿Fe品位65.2%,回收率＞86.6%的良好指标。试验证实所制备的捕收剂具有良好的低温适应性(10-20℃)。     

某低品位难浸金矿石选矿试验研究

在实验室条件下对某低品位难浸金矿石进行了选矿试验研究。结果表明,采用一粗三精三扫的浮选闭路流程,可获得品位118.5g/t、回收率80.34%的浮选金精矿。浮选金精矿在600℃下焙烧1h后再氰化浸出,可获得金浸出率90.94%、综合回收率73.06%的分选指标。     

东鞍山铁矿强化细粒铁矿物回收新技术研究

针对东鞍山烧结厂强磁选作业尾矿铁品位偏高,现有的强磁设备不能有效回收细粒铁矿物的问题,在强磁给矿样品工艺矿物学研究基础上,基于聚团分选理论,通过聚团强磁选试验详细考察了分散剂及淀 粉用量、强磁分选参数等因素对微细粒铁矿强磁分选效果的影响,通过混磁精矿反浮选试验考察了选择性聚团预处理对反浮选分选指标的影响。聚团强磁选试验结果表明：在水玻璃用量为500 g/t、DLA用量为250 g/t ,搅拌转速为900 r/min、搅拌时间为5 min、矿浆pH值为10.0、冲次为170次/min、矿浆流速为120 mL/s、磁选背景磁感应强度为1.0 T的条件下,可获得铁品位为47.65%、铁回收率为71.54%的磁选指标,与不添加药 剂调浆相比,磁选作业铁回收率提高了4.58个百分点,选矿效率提高了2.42个百分点。混磁精矿反浮选试验结果表明：与常规高梯度强磁选—反浮选工艺相比,采用选择性聚团—高梯度强磁选—反浮选工艺最终获得 的精矿品位变化不大,而混磁精矿铁回收率提高了2.05个百分点,最终浮选精矿铁回收率提高了4.37个百分点。     

辽宁某磁铁矿尾矿磁浮联合再选工艺研究

为了实现辽宁某磁铁矿磁选铁尾矿的高效回收利用,试验采用一段磁选—再磨—二段磁选—反浮选流程开展了系统的试验研究。试验结果表明：在一段磁选磁感应强度400 mT、磨矿细度-45μm90%、二段磁感应强度250 mT的条件下,可获得全铁品位52.82%的二段磁选精矿;将二段磁选精矿在矿浆温度35℃、矿浆pH值11.5、淀粉用量800 g/t、CaO用量800 g/t、粗选捕收剂DN用量700 g/t、精选1捕收剂DN用量350 g/t的条件下进行反浮选,得到了全铁品位65.43%、全铁回收率87.17%的浮选铁精矿。     

HYIC捕收剂强化鞍千混合磁选精矿反浮选效果试验

鞍千选矿厂为了优化选别工艺中的反浮选效果,取浮选入选的混合磁选精矿进行浮选试验,进行了抑制剂、活化剂、捕收剂用量及常规捕收剂TD-Ⅱ与新型捕收剂HYIC浮选效果对比试验。试验结果表明：固定矿浆pH值为11.5、抑制剂淀粉用量1 200 g/t、活化剂CaO用量500 g/t、粗选捕收剂用量800 g/t、精选捕收剂用量300 g/t,采用常规捕收剂TD-Ⅱ时,闭路试验获得了精矿铁品位68.20%、铁回收率88.73%的选别指标;采用新型捕收剂HYIC时,闭路试验获得了精矿铁品位68.25%、铁回收率90.04%的选别指标;使用捕收剂HYIC比采用捕收剂TD-Ⅱ所获得的浮选精矿产率、铁品位、铁回收率分别高0.91,0.05,1.31个百分点,捕收剂HYIC可以强化反浮选效果,提高选厂的经济效益。     

某锌铁多金属矿石选矿工艺研究

对某锌铁多金属矿石进行了系统的工艺参数优化试验研究。分选指标表明.新型捕收剂ZC对闪锌矿具有较好的选择性和很强的捕收能力。在优化操作条件下.采用浮选—磁选工艺流程,闭路试验获得了较好的锌铁分选指标:锌精矿品位和回收率分别为59.19%和98.06%;银和铟富集于锌精矿中,品位分别为339g/t和122g/t.回收率分别为96.28%和71.32%;铁精矿品位和回收率分别为65.30%和66.62%。     

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     

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     

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     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。