某氧化金矿氰化浸出工艺研究-增刊

某金矿为氧化性金矿,金品位3g/t,含砷0.86%,采用全泥氰化工艺处理得到金回收率为72.53%;采用加入常规氧化剂预处理-氰化浸出工艺得到金回收率最高为74.89%;采用碱浸-氰化浸出工艺最佳条件下,金浸出为81.97%。碱浸-氰化浸出工艺可作为该氧化金矿提金处理工艺。     

含砷锑金精矿的生物预氧化-氰化浸金研究

采用嗜酸性氧化亚铁硫杆菌对含砷锑金精矿的生物预氧化-氰化浸金进行了研究。预氧化结果表明最佳生物氧化工艺参数为: 初始pH值范围为1.8～2.0, 矿石粒径-0.074 mm, 氧化温度为25～30 ℃, 摇床转速为140 r/min, 细菌接种量为20%, 液固比100∶2, 矿浆浓度1%～2%, 氧化时间12 d。浸出结果表明, 含砷、锑分别为10.37%和36.81%的金精矿如不经生物预氧化处理, 金浸出率仅41%左右;而经过12 d的生物氧化预处理, 金浸出率可达76.55%左右, 提高了35.62个百分点。生物预氧化可以脱除金精矿中的砷, 金的浸出率与砷的氧化率成正相关关系。研究结果能为生物预氧化含砷难处理金矿氰化浸金提供理论和技术指导。     

难浸金矿石加石灰焙烧预处理的经验数学模型

加石灰焙烧是难浸金矿的一种新型预处理工艺。本文考察了这种预处理工艺在处理湖南某难浸金矿时的各种主要影响因素，提出了固硫、固砷及金浸出率与各影响因素之间的经验数学模型。     

低温低氧势焙烧预处理难浸金矿

在低温低氧势下焙烧难浸金精矿,利用金包裹体的内部缺陷,沿晶粒边界诱发粒间裂纹和裂隙的生成、扩展和破裂,以及沿晶间和相界的氧化,在较低的硫氧化率下形成浸出剂与金接触的通道。试验结果表明;硫的焙烧氧化率9.85%-10.9%,烟气SO2含量为0.285%;金的氰化浸出率从直接氰化的62.3%提高到97.5%-98.5%,NaOH加入量9.9kg/t,NaCn耗量2.7kg/t。对于某些难处理金矿,低温低氧势焙烧是有效的预处理方法。     

超声波强化ML浸金探索性研究

分别在浸出开始、浸出0.5h后和浸出2h后启动超声波装置,研究超声波对ML从含砷难处理金矿浸金的强化作用.结果表明,超声波对含砷难处理金矿的ML浸出具有强化作用,金的表观浸金速率提高3～4倍,金的浸出率提高5%～6%.     

超声波强化ML浸金探索性研究

分别在浸出开始、浸出0．5h后和浸出2h后启动超声波装置，研究超声波对ML从含砷难处理金矿浸金的强化作用。结果表明，超声波对含砷难处理金矿的ML浸出具有强化作用，金的表观浸金速率提高3－4倍，金的浸出率提高5％－6％。     

陕西某难浸金精矿细菌预氧化提金工艺研究

通过对陕西省某金矿产出难浸金精矿工艺矿物特性的研究,说明了该金精矿为低砷低硫微细粒包裹型难浸金精矿.金精矿中金的直接氰化浸出率为35.3%.经过5d细菌预氧化后,金的浸出率达到92.5%.该金精矿适合采用生物预氧化技术提金.     

含高砷金矿浸金工艺研究现状

针对含高砷金矿中砷的伴生类型、高砷金矿浸出金的工艺特点,介绍了浮选 细菌预氧化法、氧化焙烧法、加压氧化法等主要浸金方法。同时,也对其他一些工艺方法的最新发展动态进行了研究,以便根据具体情况选择适用的工艺方法,使含高砷金矿浸金率得到提高,从而达到最佳经济指标。     

生物预氧化—酸性硫脲浸金联合工艺

详细介绍了生物预氧化技术的原理、硫脲浸金法的反应机理和研究进展,以及生物预氧化—酸性硫脲浸金联合工艺的研究现状及其应用前景。采用生物预氧化—酸性硫脲浸金联合工艺处理新疆某低品位难处理金矿,对影响硫脲浸金的因素进行了实验探索,得到了该体系下较优的硫脲浸出条件为:温度25℃、pH值1.5、液固比5∶1、硫脲浓度25kg/t、浸出时间5h、搅拌速度350r/min,金浸出率最高可达97.84%。     

云南某金矿的湿法预氧化工艺研究

摘要:云南某金矿浮选精矿属于包裹金的难浸金矿.金精矿中的可见金绝大部分是包裹金,金精矿中的单体金不多,仅占可见金的4.17%,绝大部分以连生体存在,被脉石矿物包裹的可见金占可见金的87.5%,被黄铁矿包裹的可见金占可见金的8.33%。针对此特性,采用碱性常温常压强化预氧化工艺技术,充分利用机械活化和选择性氧化原理,利用超细磨塔式磨浸机的机械活化作用以及强化预氧化槽的强化搅拌作用,在常温常压下引发金精矿中的砷、硫矿物在高温高压下发生的氧化反应,使砷、硫矿物中包裹金解离和暴露,金精矿由难浸转变成易浸,达到预氧化目的,然后接氰化作业,高效浸出回收金,金浸出率由不足40%提高到88.56%。      

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。