KMLZ-180/50°倾斜板浓密机在云南木利锑矿的应用

KMLZ - 180 / 5 0°倾斜板浓密机工艺性能先进、操作简单、单位面积处理能力大 ,满足了生产的需要 ,值得推广应用     

高效浓密机浓缩过程动态平衡控制研究

基于高效浓密机浓缩机理,分析了料浆絮凝沉降过程,将料浆的分布状态划分为5个区域。以高效浓密机出浆过程中4种不同状态为基准,描述了不同状态下各区域的动态变化情况。利用压缩层和浓缩层高度与料床高度和重量的对应关系,提出了高效浓密机浓缩过程动态平衡控制措施,并通过应用实例计算出底流浓度为70%～71%时,对应流量为93.78～105.98 m3/h,料床高度与重量分别不低于15.41%和13.45%。工程运用结果表明,在满足料床高度与重量的情况下,底流流量基本控制在93.58～103.61m3/h,底流浓度范围基本在69.7%～71.2%,理论计算结果与实际情况基本吻合,可满足生产要求。     

振动斜板盒浓密机在铜街选矿厂尾矿浓缩中的应用

云南华联锌铟股份有限公司铜街选矿厂由于产能的提升,原厂区内自主增设的普通箱式沉降槽已不能满足生产的需要。为确保厂区浓缩系统溢流水的质和量,采用新型高效浓缩设备--振动斜板盒浓密机进行了分流处理改造。调试期间-0.047 mm占53.36%、浓度为11.77%、流量不低于200 m3/h的综合尾矿浆经ZXN-300型振动斜板盒浓密机浓缩处理,所得底流浓度≥35%,溢流水含固量＜100 mg/L,回水率达70%～80%。1 a多的生产实践证明,振动斜板盒浓密机的各项生产指标均优于工艺要求,且设备无故障。与箱式沉降槽相比,振动斜板盒浓密机具有处理能力大、占地面积小、工作效率高、技术性能优越等特点,可广泛应用于微细粒尾矿的高效浓缩。     

某超细粒物料的脱水实践

某选厂粒度为-320目90%的铁精矿采用KMLZ型斜板浓密机和10m2圆盘式真空过滤机进行浓缩与过滤,最终精矿产品水份<15%,脱水效果较好,可为其他细粒物料的脱水提供有益的参考。     

某铅锌矿超细粒尾砂充填强度分析及优化措施

栖霞山铅锌矿充填站-20μm极细颗粒尾砂含量过高,尾砂最大沉降浓度由69%降至61. 98%,充填料浆制备输送浓度由72%降至64%左右,导致充填体强度大幅下降。为此,对充填系统进行优化,使得进入浓密过滤系统的全尾砂不产生溢流细泥而进入充填流程,减少了浓密机溢流细颗粒的含量,提高了充填料浆的级配,将充填料浆浓度提高至74%;并根据充填料浆的流变特性,将充填料浆输送管网管径由89 mm增加至100 mm,保证高浓度充填料浆的输送。充填料浆浓度从70%提高到74%,各龄期的充填体强度均提高20%左右,实现了矿山超细粒全尾砂充填,确保了充填质量。     

细粒物料的浓缩过滤生产实践

针对某选厂铁精矿粒度为 - 32 0目 90 %的情况 ,采用KMLZ型斜板浓密机和 10m2 圆盘式过滤机进行浓缩过滤 ,最终精矿产品水份 <15 %。生产实践表明 ,采用该种配置浓缩过滤微细粒物料 ,具有投资省、配置简单、运行效果好、维护可靠方便等优点 ,对大、中、小型选厂的设计选型具有实际借鉴意义。     

料浆浓度和pH值对磷石膏制备α-半水石膏的影响

以水洗磷石膏为原料,采用半液相蒸压法制备 α-半水石膏。 从脱 水反应、晶体形貌、物相组成、强度等 角度,研究料浆浓度和 pH 值对 α-半水石膏性能的影响。 XRD 分析结果 表明,料浆浓度在 55% ~ 80%和 pH 值为 2. 0、 4. 4、6. 7 时磷石膏全部转化为半水石膏。 结晶水含量、SEM、强度测 试结果表明:当料浆浓度从 55%增至 70%,α-半水 石膏生成的诱导期从 1 h 减至 0. 5 h,晶体生长期从 5 h 增至 5. 5 h, 料浆浓度继续增至 80%,诱导期从 0. 5 h 增至 1. 5 h,晶体生长期从 5. 5 h 减至 4. 5 h;发育较好的 α-半水石膏晶体形貌 均为柱状;当料浆浓度从 55%增至 65%,长径比从 3. 0 减至 2. 8,标准稠度用水量从 44%降至 40%,绝干抗压强度从 40 MPa 增至 43. 8 MPa,料浆浓度继续增至 80%,长 径比从 2. 4 增至 3. 0,标准稠度用水量从 40%增至 42%,绝干抗压强度 从 43. 8 MPa 降至 38. 2 MPa,在料浆浓度为 65% 时,绝干抗压强度最高达到 43. 8 MPa。 pH 值从 2. 0 增至 6. 7,诱导 期均为 1 h,晶体生长期从 3 h 增至 5 h;发育较好的 α-半水石膏晶体形貌均为柱状,长径比从 3. 2 减为 2. 7 后增至 2. 9, 标准稠度用水量从 43%降至 40%,绝干抗压强度 从 37 MPa 增至 43. 4 MPa。 在料浆浓度为 65%,pH 值为 6. 7 时,α- 半水石膏晶体形貌呈柱状,长径比为 2. 9,标准稠度 用水量为 40%,2 h 抗折强度为 5. 9 MPa,绝干抗压强度为 43. 4 MPa。     

分级细尾砂充填试验研究

受尾砂细度的增加和环保政策法规要求日趋严格的影响,国内部分矿山开始采用“分级细尾砂充填、粗尾砂综合利用”这一开发模式。然而,尾砂级配的改变必然会引起尾砂浓密、充填料浆输送以及充填体强度的变化。鉴于此,针对某金矿分级细尾砂开展了充填试验研究。试验结果表明：相比于全尾砂,分级细尾砂中25μm以下颗粒含量增加了17.18%,150μm以上颗粒含量减少了7.61%;分级细尾砂浓密效率不及全尾砂,分级细尾砂相比全尾砂进料质量浓度降低了2.65个百分点,絮凝剂添加量增加了10 g/t,处理量降低了0.23 t/(m²·h);分级细尾砂充填料浆输送性能不及全尾砂充填料浆,在充填料浆流速1.47 m/s、2.06 m/s、2.45 m/s情况下,质量浓度66.15%的全尾砂充填料浆管道压力损失分别比质量浓度64.13%的分级细尾砂充填料浆管道压力损失降低了36.46%、39.37%、40.17%;分级细尾砂充填体强度低于全尾砂充填体强度,相比于全尾砂充填体,对应料浆状态及灰砂比的分级细尾砂充填体3 d强度降低了50%～80%,28 d强度降低了30%～70%。研究结果对该矿分级细...     

超细全尾砂膏体充填材料特性试验

为探索某矿山超细全尾砂作为充填材料的可行性,开展了充填材料特性试验研究。试验结果表明,全尾砂-75μm粒级占比83.14%,-20μm粒级占比56.91%,属于超细粒级全尾砂。在添加SNF625V型阴离子絮凝剂20 g/t,矿浆稀释浓度为10%时,全尾砂絮凝沉降效果最好。全尾砂自然静态沉降极限质量浓度约62%,动态沉降试验1h以后底流浓度可达到极限浓度65%,料浆流动性较好。动态沉降溢流水含固量小于80mg/L,溢流水澄清度高。当质量浓度超过68%时,料浆流动性变差,很难实现管道自流输送。当质量浓度为68%,灰砂比为1︰4时,料浆坍落度为25.2 cm,泌水率为1.62%,充填体7 d和28 d抗压强度分别大于1.0 MPa和2.5 MPa,满足矿山井下回采技术要求,达到了膏体优良状态。     

高强度调浆对微细粒磷灰石浮选效果的影响研究

为了提高微细粒磷灰石的浮选指标,需要对入浮矿浆进行高强度调浆处理。本文以承德某地的斜板浓密溢流为研究对象,展开高强度调浆工艺条件试验。以实验室30L规格的高强度调浆机和工业上2m直径的高强度调浆机为研究手段,对调浆时间、调浆转速等展开条件试验。30L调浆机结果表明最佳的浮选时间为6分钟,最佳的线速度为8.35m/s,和普通改质机叶轮和直桨叶轮相比,新型叶轮的调浆效果更好,并且能耗较低。2m高强度调浆机的工业试验表明,150rpm是最佳的转速。并且和普通调浆机相比,在相同产率（粗选产率为5%~10%）下磷灰石的回收率提高了约10%,可见高强度调浆机能显著改善细粒磷灰石的浮选环境。清水条件高速摄像和浊度测试结果表明,高强度调浆机叶轮和普通搅拌槽叶轮相比,对油滴的分散效果更显著,搅拌后形成的乳浊液体系更为稳定。     

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。