高硫煤微波辅助脱除有机硫试验研究

以新阳高硫煤为试验用煤,采用硝酸洗涤法除去煤中无机硫,在微波与氧化剂协同作用下开展脱硫试验,采用单因子法考察了氧化剂配比、辐照时间对煤中有机硫脱除效果的影响,采用XRD和XPS方法分析试验前后含硫组分的变化情况。     

利用超声波-微波技术脱除煤中有机硫的研究

为了进一步提高煤中有机硫的脱除效果,分别研究超声波和微波的辐照时间、工作功率对脱硫率的影响,并探索二者联合作用对脱硫率的影响规律。试验结果表明:超声波、微波的脱硫效果显著,而超声波-微波的脱硫效果优于其中任意一种;在超声波辐照时间为70 min、工作功率为240 W,微波辐照时间为30 min、工作功率为600 W的条件下,煤中的有机硫脱除效果最好,脱硫率为78.60%。     

复杂高硫煤化学脱硫试验研究

为降低复杂高硫煤中的全硫含量,采用有机溶剂萃取-稀硝酸处理两步法进行脱硫试验。在常温常压下,首先采用有机溶剂萃取脱除煤中的有机硫,再对萃取脱硫后的试样进行稀硝酸处理,以进一步脱除煤中的无机硫,降低试样硫分。试验结果表明,常温常压条件下,当原煤粒度为-200目、萃取剂为对甲酚、萃取时间为3 h时,煤样中的有机硫基本被完全脱除;对萃取脱硫后的试样进行1∶10稀硝酸处理脱硫,在试样粒度为-325目、搅拌速度300 r/min、反应时间2 h的条件下,最终产品硫分可由原煤6.28%降至0.73%,属于低硫煤。     

高硫煤脱硫可行性研究

对选定的2种高硫煤进行取样、可选性分析和归纳其脱硫特性，对可选性数据进行工艺预测研究。结果表明，由于煤中含有大量有机硫及细粒分散的黄铁矿硫，利用目前的洗洗方法不可能生产符合环境要求的低硫煤产品。用可选性数据和工艺预测模型寻求脱硫的最佳方法，在采用先进的选煤工艺条件下可以脱除大部分无机硫，并为每种煤推荐了较适合的高效脱硫工艺。     

超声波和微波联合加强氧化脱除煤中有机硫

用超声波和微波辐射法在氧化体系下,对北京、王庄、兖州、临汾煤进行了氧化脱硫研究.实验结果表明,超声波和微波结合可达到较好的氧化脱硫效果,超声波作用时间和功率、微波作用时间和功率、煤样粒度、氧化剂类型以及氧化剂用量对煤中有机硫的脱除率有较大影响.在优化的工艺条件下：超声波功率为540 W,作用时间为70 min,微波功率为280 W,照射时间为30 min,煤与HAc+H₂O₂（体积比1∶1）氧化剂配比为3/60 (g/mL),煤粒度d≤0.10 mm;王庄煤有机硫的脱除率可达到65.0 %.研究表明,超声波和微波联合氧化法是脱除原煤中有机硫的一种有效方法,对不同煤样的脱硫效果不同,与煤中有机硫的存在形态有关.     

微波和硝酸处理后炼焦煤中硫形态变化的XPS研究

为分析微波和硝酸处理对山西高硫炼焦煤中各形态硫变化的影响,应用XPS(X射线光电子能谱技术)研究了该煤样在酸洗和微波辐照后其中硫赋存状态和含量的变化。研究结果表明:煤样中无机硫含量约为14.2%,主要为硫酸盐硫;有机硫含量约为85.8%,噻吩类硫含量较高。微波和酸洗处理后,全硫脱除率为38.8%,硫醚硫醇类硫脱除率为45.1%,噻吩类硫脱除率为20%,亚砜类硫脱除率为29%,无机硫基本全部被脱除。采用酸洗和微波辐照的方法可以有效降低山西高硫炼焦煤中硫的含量,全硫脱除率高达38.8%。     

炼焦煤中有机硫对微波的响应规律

在固定腔微波反应器中,分别使用不同频率的微波对3种炼焦煤开展脱硫试验,采用XPS分析方法解析微波辐照前后煤中有机硫赋存形态及相对含量的变化,利用Materials Studio模拟平台计算煤中不同有机含硫结构化学键特性在微波作用后的变化,探寻微波作用下煤中有机硫的变化和响应机理。研究表明,山西高硫炼焦煤中有机含硫组分包括硫醇(醚)、噻吩和(亚)砜,840 MHz和915 MHz频率微波辐照后,硫醇(醚)相对含量下降,噻吩相对含量升高,2 450 MH频率微波辐照后,有机含硫组分相对含量变化不明显。模拟计算显示,在外加电场作用下,煤中C—S键长增大、键级减小,有机含硫分子偶极矩增大。说明频率为840 MHz和915 MHz的微波辐照能改变煤中有机硫的化学结构参数,进而影响煤中有机硫的脱除。     

煤炭微波脱硫影响因素的试验研究

在加入浸提剂的条件下,进行了微波辐照脱除煤中硫的试验研究。本文采用单因素方法,从微波辐照时间、功率、煤炭粒度、浸提剂浓度和液固比等方面,考察了不同因素对煤炭微波脱硫效果的影响并优化出各因素最佳的取值范围。结果表明,以NaOH作为浸提剂,微波辐照能够有效地脱除煤中硫,且煤发热量损失极少,是一种有效的脱硫方式。     

平朔高硫动力煤微波脱硫试验研究

为了探索微波辐照对平朔高硫动力煤的脱硫效果,对平朔高硫动力煤进行了微波脱硫试验研究,结果表明在脱硫助剂的参与下微波辐照能够有效脱除煤中的硫。通过试验研究了助剂种类、煤样粒度、微波辐照时间以及助剂体积量对微波脱硫效果的影响。     

长广高硫煤各种形态硫分布研究

高硫煤中各形态硫的分布及其镶嵌特征是选择煤炭脱硫工艺的基础。采用浮沉密度分级和煤岩分析手段对长广高硫煤的各形态硫分布进行了详细深入的研究，表明长广煤中硫分的７０％是黄铁矿硫，且主要以单体存在，通过洗选就可以大部分脱除。     

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     

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     

2014 second batch of rare earth quota released

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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     

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.     

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.