微细粒赤铁矿-石英体系的选择性絮凝试验研究

通过采用常规絮凝剂和新合成絮凝剂絮凝对单矿物和人工混合矿选择性絮凝试验,得出不同选择性絮凝剂对微细粒赤铁矿-石英体系的絮凝效果优劣顺序为:淀粉丙烯酰胺接枝聚合物＞磺化聚丙烯酰胺＞苛化玉米淀粉,综合考虑品位和回收率指标,以淀粉丙烯酰胺接枝聚合物效果最佳。当淀粉丙烯酰胺接枝聚合物接枝聚合物加入量为3mg/L时,沉降物铁品位为42%,铁回收率为91.42%,当用量为1mg/l时,絮凝沉降物最高品位为45%,相比原矿提高了12个百分点,为采用常规选矿方法进一步分选絮团创造了条件。      

某多金属矿尾矿废水处理的试验研究

通过实验室小试得到处理某多金属矿尾矿废水的最佳方案。首先选用石灰作为脱稳剂进行脱稳,当调节废水pH值为11.5时,脱稳沉淀效果最好。然后选用阳离子型聚丙烯酰胺作为絮凝剂进行絮凝沉降,当阳离子型聚丙烯酰胺用量为2mg/L,pH值在8~9时,处理后废水能够达标排放。     

UV聚合法制备淀粉和丙烯酰胺接枝共聚物及其性能表征

以淀粉与丙烯酰胺 (AM)为原料 ,采用UV聚合法制备淀粉与丙烯酰胺接枝共聚物 (St-PAM)。通过实验得出较佳的工艺条件为 :淀粉糊化温度为 90℃ ;糊化时间为 1h ;AM与淀粉的最佳配比为 1:1 6 (质量比 ) ;引发剂用量是 1 2g/L ,交联剂用量 3g/L ,在此条件下得到的接枝共聚物接枝率和接枝效率最高。用IR对产物的结构进行了表征 ,并检测了接枝共聚物产品对煤泥水的絮凝效果     

淀粉接枝丙烯酰胺絮凝剂在煤泥水处理中的应用

以溶液聚合法合成了非离子型淀粉接枝共聚物St-g-AM及阳离子型淀粉接枝共聚物St-g-AM-DMC,采用红外光谱对St-g-AM和St-g-AM-DMC进行了表征,将2种接枝共聚物作为絮凝剂应用于煤泥水絮凝沉降试验,考察了2种絮凝剂对不同粒度煤样的絮凝处理效果。试验结果表明,合成的2种絮凝剂在处理细粒高灰煤泥时絮凝效果比较突出,同时考察了在处理细粒煤泥时,絮凝剂用量、过滤时间、特性粘数、pH值、温度以及时间对透光率的影响。两者之中阳离子型St-g-AM-DMC的絮凝效果更优于非离子型St-g-AM,表现在pH值适用范围广、絮凝时间短以及透光率高。     

淀粉接枝聚乙烯胺捕集剂的合成与吸附性能

本实验以木薯淀粉为主要原料,高锰酸钾为引发剂,用反相乳液法接枝丙烯酰胺,合成淀粉与丙烯酰胺的共聚物,共聚物经Hofmann降解合成淀粉接枝聚乙烯胺(St-PVAm)的共聚物.研究了合成淀粉接枝聚乙烯胺的工艺条件,得出最佳条件为:淀粉接枝丙烯酰胺2.0g,NaOH的浓度为7.05mol/L,NaClO的浓度为0.146mol/L,降解时间为3h,反应温度为-10℃.考察了St-PVAm捕集重金属离子性能,研究表明,螯合剂的用量,溶液的pH值,搅拌时间是影响去除效果的主要因素,温度因素的影响则不大.     

壳聚糖包覆微生物絮凝剂絮凝特性的研究

使用壳聚糖包覆微生物絮凝剂是一种新的废水处理方法。采用正交实验法确定壳聚糖包覆微生物絮凝剂的最佳絮凝条件为:高岭土悬浊液絮凝pH值为8~12,壳聚糖包覆微生物絮凝剂投加量为90 mL/L,絮凝时间为10 min,絮凝温度为25℃。在最佳絮凝条件下,高岭土悬浊液的絮凝率可高达97.3%。壳聚糖包覆微生物絮凝剂絮凝效果好,处理成本低,在实际应用中的前景广阔。     

絮凝法处理煤炭地下气化废水试验研究

为解决气化污水在向气化炉回注过程中油及灰尘对管道的堵塞和腐蚀问题,利用河北大城煤炭地下气化冷凝水进行絮凝试验研究。以聚合氯化铝(PAC)和聚丙烯酰胺(PAM)作为絮凝剂和助凝剂,研究了不同pH值及在相应pH值下加入100mg/L的PAC后污水Zeta电位的变化规律。研究结果表明:絮凝剂PAC使用的最佳pH值在7左右;对比不同PAC和PAM的投加量,研究其除尘除油的能力,当絮凝剂的投加量为100mg/L、助凝剂的投加量为3mg/L时,废水中的含油量由2060mg/L降至1174mg/L,除油率达43%,含尘量由600mg/L降至96mg/L,除尘率达84%,此时PAC和PAM为最佳用量组合。     

絮凝剂对尾矿沉降的影响

在尾矿浓缩池中添加不同种类的高分子絮凝剂、无机絮凝剂及有机絮凝剂,用实验室模拟的方法,通过几种絮凝剂的沉降试验,选择合适的絮凝剂及用量,并研究pH值及温度的影响,旨在提高尾矿的回水利用率。试验结果表明,在pH7和15℃条件下添加聚丙烯酰胺(PAM)24g/t时,絮凝效果最佳,回水利用率提高14.66%。     

鲕状赤铁矿选择性絮凝试验研究

文章以贵州某难选鲕状赤铁矿为研究对象,探索PAM、阳离子醚化淀粉、玉米淀粉、油酸钠絮凝剂的絮凝效果以及这些絮凝剂的药剂用量和相互作用的效果。试验结果表明,在磨矿细度-0.045 mm占100%,p H值为12.50,硅酸钠与六偏磷酸钠协同用药作为分散剂,用量为100 g/t(1:3),阳离子淀粉作为絮凝剂,用量为275 g/t,进行选择性絮凝试验,最终得到絮凝精矿品位为46.07%,回收率为76.99%,絮凝尾矿品位为36.20%。     

生物絮凝剂处理高浓度细粒煤泥水的优化条件研究

通过对白腐真菌的生物学培养特性研究,获得最佳培养条件为转速160r/min,温度30℃,稻壳浸出液90mL,葡萄糖质量浓度35g/L,pH值3.5;同时分析了煤水中煤泥颗粒组成,发现其粒度小于0.045mm的含量占55.93%,而大于0.25mm的含量仅占3.75%,说明煤泥水中细粒含量较多,靠自身重力难以沉降;探讨了pH值、生物絮凝剂用量、搅拌方式和金属离子等单因素对煤泥水絮凝效果的影响,通过正交试验进一步优化了该菌所产絮凝剂对煤泥水絮凝效果的条件,结果表明:当煤泥水质量浓度27.42g/L、助凝剂(CaCl2)质量浓度5.0g/L、采用二段式搅拌(第一段搅拌速度60r/min,搅拌时间180s;第二段搅拌速度180r/min,搅拌时间60s)、pH值11和絮凝剂体积浓度15mL/L时,其絮凝活性最佳,可达98.71%;进一步实验表明,絮凝活性物质绝大部分存在于细胞外,是微生物在发酵过程中菌体细胞产生的胞外分泌物。该絮凝剂具有较强的热稳定性,多种阳离子对该絮凝剂都有助凝作用,并且二价阳离子Ca2+对白腐真菌产生的絮凝剂助凝效果显著,具有良好的应用前景。     

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。