硫精矿中铜钴同步浸出试验研究

以湖北大冶含铜钴硫精矿为原料,分别研究了硫精矿、硫精矿氧化焙烧渣和硫精矿氧化-还原焙烧渣中铜、钴的同步浸出行为,考察了浸出温度、浸出时间、固液比等工艺参数对铜、钴浸出的影响。结果表明,硫精矿氧化-还原焙烧渣中的铜、钴最易被浸出,浸出条件为:浸出温度70 ℃、浸出时间4 h、固液比1∶5,此时铜和钴浸出率分别为91.46%和65.84%; 采用氧化-还原焙烧-浸出-磁选联合流程处理硫精矿时,可获得铁品位62.31%、回收率68.26%的铁精矿,该工艺实现了硫精矿及焙烧渣中铜、钴、铁资源的综合回收。     

铜冶炼渣直接还原焙烧—磁选回收铜、铁试验研究

铜冶炼渣中含有铜、铁等有价金属，其中铜金属可通过直接浮选回收，但铁的矿物组成复杂，很难直接通过磁选回收。以含铁38.76%、含铜2.26%的铜冶炼渣为研究对象，在矿石性质研究基础上，以烟煤为还原剂，通过直接还原焙烧—磁选工艺回收铜渣中的铜、铁。结果表明，铜冶炼渣、烟煤和还原助剂氧化钙以100∶25∶20的质量比混合，在焙烧温度1 200 ℃，焙烧时间80 min的条件下直接还原焙烧铜渣；焙砂在磨矿细度为-0.045 mm含量占80%，磁场强度为111 kA/m的条件下进行磁选试验，最终可获得铁品位为91.54%，铁回收率为90.54%，铜品位为6.06%、铜回收率为89.04%的含铜铁精矿，研究结果可为铜冶炼渣的回收利用提供依据。     

复杂含铜金精矿铜回收工艺研究

针对某含铜金精矿,研究了焙烧—酸浸—萃取回收铜工艺。结果表明,在焙烧温度650℃,焙砂在初酸浓度为35 g/L、液固比1.5∶1,浸出温度90℃,浸出时间1.5 h的条件下,铜浸出率高达96.30%,酸浸渣铜品位可降至0.2%以下;萃取剂浓度为20%,相比O/A=2∶1,混合时间为4 min,pH值1.5,铜萃取率可达96%以上,实现了铜的高效回收。     

经改性的电炉贫化铜渣的酸浸—弱磁选试验

某铜冶炼厂的电炉贫化渣铜、铁含量分别为1.24%和31.80%,主要可见铁橄榄石相和磁铁矿相。为了确定该电炉贫化渣的开发利用工艺,进行了工艺条件研究。结果表明,铜渣在磨矿细度为D90=52.6μm,硫酸的浓度为150 g/L,过氧化氢添加量为150 m L/kg,液固比为5 m L/g,浸出温度为60℃,浸出时间为60 min,弱磁选磁场强度为160 k A/m情况下,可获得铜浸出率为67.15%,铁精矿铁品位为56.01%、铁回收率为62.38%的试验指标,可较好地实现该资源中铜、铁的回收。     

铜钴渣氧压酸浸提取铜钴试验研究

硫化铜钴精矿经硫酸化焙烧—酸浸后得到的浸出渣仍含有较多的铜和钴,需进一步回收。采用加压浸出技术浸出该浸出渣提取残余的铜和钴。研究了浸出液固比、初始硫酸浓度、浸出温度等工艺参数对铜钴渣浸出的影响。结果表明,在铜钴渣150g、液固比6∶1、初始硫酸浓度100g/L、常温调浆时间0.5h、加压浸出温度180℃、加压浸出时间3h、氧气分压0.1MPa的最佳浸出条件下,铜和钴的浸出率可分别达到96.5%和98.1%,铁浸出率约8.3%,大部分的铁抑制在渣中,加压浸出效果好。     

铜冶炼渣硫酸浸出回收铜试验研究

以硫酸溶液为浸出剂,采用常压氧化浸出法处理铜冶炼渣以回收渣中有价金属铜。考察了浸出温度,浸出时间,硫酸浓度,浸出液固比,氧化剂(双氧水)添加量对铜浸出率的影响。试验结果表明:在未加入氧化剂时,主要发生的是铜氧化物的简单酸溶反应,硫化铜几乎不溶于浸出液,因此铜浸出率很低;而随着氧化剂添加量的增加硫化铜被氧化浸出,因此铜浸出率增加很明显。此外,铜浸出率随着浸出温度,浸出时间和浸出液固比的增大而增大。浸出过程最佳的条件为:浸出温度70℃,时间180 min,硫酸浓度2 mol/L,液固比8∶1,氧化剂(双氧水)添加量400 m L/kg。铜浸出率可达到91.2%。通过对浸出渣XRD和SEM-EDS分析可得浸出渣中主要的矿物为磁铁矿。在磁场为2T的条件下,浸出渣磁选可以得到品位53.15%的铁精矿。     

含铜难处理铁矿的硫酸浸出试验研究

研究了国外某含铜铁矿的酸法浸出,考察了硫酸用量、浸出时间、液固比、转速、浸出温度等因素对浸出率的影响.试验结果表明:在硫酸用量140kg/t,浸出时间60min,液固比为3:1,转速300r/min,温度80℃的条件下,铜的浸出率达73%,浸渣含铜0.24%.浸渣通过适当配矿后,同时还得到了含铜0.2%左右的铁精矿,实现了铜铁资源的高效利用.      

铜尾渣直接还原焙烧——磁选 回收铁的试验

某铜冶炼渣浮选尾渣中含铁36.80%,铁主要铁橄榄石和磁铁矿的形式赋存,根据其矿石性质特点,以烟煤为还原剂,应用直接还原焙烧—磁选工艺回收铜尾渣中铁。试验结果表明:将铜尾渣与烟煤和作为助还原剂的CaO按100∶30∶20的质量比混合,在焙烧温度1 200℃,焙烧时间为60 min,磨矿细度为-0.045 mm含量占80%,磁场强度为127.32 kA/m的条件下,可获得铁品位为91.68%、铁回收率为82.24%的铁精矿。     

硫酸渣磁化焙烧过程中铁的转化规律及分离试验研究

采用磁化焙烧-磁选工艺回收硫酸渣中的铁,考察了焙烧温度、焙烧时间、煤粉用量以及磨矿细度等因素对铁精矿质量的影响,最终确定了焙烧温度750 ℃、焙烧时间50 min、还原剂煤粉用量8%为最佳焙烧条件。物相分析结果表明,磁化焙烧后硫酸渣中的铁主要以磁铁矿形式存在。焙烧矿磨矿细度为-0.045 mm粒级占87.31%时,采用一粗一扫闭路磁选工艺可获得铁品位65.58%、回收率96.99%的铁精矿,且精矿中的铁99%为磁性铁。     

赞比亚某复杂铜矿预处理—酸浸提铜试验

赞比亚某复杂难选氧化铜矿石矿物组成复杂,属结合相占比较高的氧化铜矿石,铜品位为2.10%。为开发利用该铜矿石资源,采用预处理—硫酸酸浸工艺进行了浸铜工艺参数研究。结果表明,在磨矿细度为-200目占58%,预处理剂K1浓度为9%、液固比为1∶1、预处理温度为85℃、预处理时间为1 h,酸浸的硫酸浓度为5%、液固比为1.5∶1、浸出温度为50℃、浸出时间为3h的情况下,可取得88.83%的铜浸出率。较好地解决了矿石的铜浸出问题,为开发利用该铜矿资源提供了技术依据。     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

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