高硫煤电化学催化氧化脱硫机理的研究

电化学催化氧化脱硫方法是一种温和的化学脱硫方法,它比常规的物理和化学脱硫方法更具优势,对于无机硫(FeS2)和有机硫都有一定的脱除效果。但其脱硫机理至今还没有完全弄清楚。本文以石坷节高硫煤样为原料,在酸性体系下,利用电化学催化氧化方法对煤样进行了处理。并利用X射线衍射(XRD)、X射线荧光光谱(XRF)等现代测试手段研究煤中矿物成分,矿物元素含量的变化,以及电解液组分变化。研究表明,电化学催化氧化脱硫是借助电解阳极表面产生活性氧等氧化剂或高价离子氧化煤中的硫,将煤中黄铁矿硫和有机硫化物转化成水溶性的硫化合物,从而达到脱硫的目的。通过试验分析也可得出,加入的催化剂离子也参与了反应,加速了脱硫的进程。     

高硫煤电化学催化氧化脱硫试验研究

以山西石坷节煤样为原料,着重考察了酸性无隔膜体系中煤的电化学脱硫规律。讨论了电解电流,电解时间,电解质浓度,煤浆浓度,煤粉粒度以及催化剂种类等主要因素对煤脱硫率的影响,最终确定了电化学脱硫的较佳工艺条件。通过电化学催化氧化脱硫方法,有效缩短了电解反应时间,提高了脱硫效率,达到了有机硫和无机硫同步脱除的目的。试验结果表明煤中无机硫和有机硫都可获得理想的脱除效果,在有催化剂条件下获得无机硫脱除率为90%,有机硫脱除率为37.5%。硫的总脱除率达80%。     

澄合高硫煤电解法脱硫实验研究

为了降低脱硫成本和简化工艺条件,以澄合高硫煤为原料,在酸性条件下研究了煤中全硫的电解法脱硫规律。讨论了催化剂、电解质种类和浓度、电解电压、电解时间和温度,以及煤浆浓度等主要因素对煤中全硫脱硫率的影响,并确定了电解法的最佳条件为电解质硫酸浓度3.5%,催化剂硫酸锰浓度2%,电解时间4 h,电解温度70℃,电解电压1.5 V,煤浆浓度2%。     

煤的电化学脱硫研究(Ⅰ)——酸性无隔膜电解体系

以山家林洗精煤为原料,试验研究了酸性无隔膜电解体系中煤的电化学脱硫规律。试验结果表明煤中硫酸盐硫和黄铁矿硫都可获得理想的脱除效果,全硫脱除率最高可达54.8%。此外,红外光谱分析证实酸性体系中电化学脱硫对煤质影响较大,碳氢比明显增高,同时煤中有机硫也被明显脱除。     

处理高硫煤的电化学方法实验研究

随着潞安集团对下组煤开采的推进,下组高硫煤产量逐年递增,石圪节矿是潞安集团第一个开采下组煤的矿井。本文对石圪节的特高硫煤进行了电化学试验分析,分别从电解质浓度、反应温度、电流强度、电解时间、煤粒度及煤浆浓度等影响因素对脱硫效率进行试验分析,总结出最佳脱硫方法。     

煤的电化学脱硫研究(Ⅱ)——酸性有隔膜电解体系

以山家林洗精煤为原料,在酸性有隔膜电解体系中实验研究了电解工艺条件对脱硫效果及联产氢气的影响。试验结果表明隔膜体系中煤的电化学脱硫规律与无隔膜体系相似,且脱硫效果接近,全硫脱硫率最高可达52.1%。当电解电压达到2.5V后,氢气的产率与电解时间及电流密度成正比,基本不受其他条件的影响。     

煤的电化学脱硫研究（I）—酸性无隔膜电解体系

以山家林洗煤为原料，试验研究了酸性无隔膜电解体系中煤的电化学脱硫规律。试验结果表明中硫酸盐硫和黄铁硫都可获得理想的脱除效果，全硫脱除率最高可达54.8%。此外，红外光谱分析证实酸性体系中电化学脱硫对煤质影响较大，碳氢比明显增高，同时煤中有机硫也被明显脱除。     

氢氧化钠体系中煤的电化学脱硫研究

通过正交实验确定了在氢氧化钠体系中脱除煤中硫份适宜条件,研究了脱硫条件对硫脱除率影响.表明NaOH电解体系脱除硫适宜条件:电流1.0 A,温度75℃,煤浆浓度0.040 g/ml,电解质浓度2.0 mol/L,电解时间4 h.在此条件下,脱硫率最高达70%.脱硫率随电流强度、煤浆浓度、电解温度和电解时间增加先增大,达到一定程度后,其变化不再明显,甚至降低;脱硫后,煤结构基本不发生变化,降低灰份.     

基于电场与软锰矿联合技术对高硫煤脱硫行为的强化

中高硫煤利用过程中产生大量的SO_x排放到空气中,对环境造成严重的污染,这导致其利用困难。为实现中高硫煤清洁高效利用,基于软锰矿中二氧化锰的强氧化性,采用电场与软锰矿联合的技术促进高硫煤脱硫,重点考察不同反应条件对高硫煤脱硫率及软锰矿中锰的浸出率的影响,利用XRD,FTIR,XPS等分析测试方法,研究脱硫反应前后煤元素组成、硫含量等主要性质变化,探究其脱硫机理。结果表明,当软锰矿与高硫煤质量比为1/7,煤浆质量浓度为0.05 g/mL,反应时间5 h,反应温度80℃,初始硫酸浓度为1.2 mol/L,电流密度为600 A/m²时,与预处理煤相比,高硫煤脱硫率可达40.56%,锰的浸出率为95.23%。在相同反应条件下,与无电场浸出相比,电场的引入可使高硫煤脱硫率提高19.93%,软锰矿中锰的浸出率提高16.77%。经电场与软锰矿联合脱硫后的煤中的固定碳及热值略微降低,而挥发分和灰分略微增加,小分子增多,另外,煤中的分子结构基本未改变。在电场的作用下,软锰矿中二氧化锰的强氧化作用会促进煤粒表面有机分子键断裂,使高硫煤粒内部无机硫及有机硫充分暴露,...     

脆硫锑铅矿矿浆电解过程硫的形成机理

通过脆硫锑铅矿矿浆电解渣工艺矿物学研究和有关热力学和电化学的分析，探讨元素硫形成及氧化机理，结果表明，元素硫是脆硫锑铅矿与Fe^3 接触氧化的反应产物，脆硫锑铅矿分解生成H2S再被Fe^3 氧化的反应是次要的。矿浆电解时，元素硫在阳极上基本不被氧化。     

New energy vehicle:an opportunity for rare earth magnets

<正>Extracted from Securities Guide 1.Popularity of new energy vehicles—an irresistible market trend1.1 Progress of new energy vehicles Chinese Premier Li Keqiang said recently on a visit to Xi'an BYD Autos that new energy vehicles,especially new energy bus,can lessen environment and noise pollution.He encouraged the use of new     

China rare earth market review

正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent     

China rare earth market review

正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of     

China rare earth market review

正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,     

注浆加固技术在十三矿-685 m进风大巷中的应用

针对煤矿开采深度不断向深部延伸,掘进巷道受深部高应力的影响越来越大,巷道围岩整体稳定性差,矿山压力显现越剧烈现象,一般锚网喷加锚索支护无法从根本上控制巷道的变形。总结了平煤股份十三矿-685 m进风大巷注浆加固技术,依据对巷道掘进之后变形监测数据的采集,对巷道变形机理进行分析研究,并对注浆时段进行了合理选择,在对巷道的注浆工艺进行了充分论证的基础上,对巷道进行了注浆。注浆后效果表明:巷道滞后注浆时间段的选择非常重要,巷道在恰当的时间内进行注浆加固施工,能有效控制巷道的变形,巷道注浆后变形量明显减小,岩体的稳定性明显增强,减少了巷道日常维修工作,降低了矿井的生产成本,保障了矿井的安全生产。     

Brief news

正China Minmetals Rare Earth Construction of Jianghua Separation Plant is set to complete at the yearend Civil works of Jianghua Separation Plant have been finished and the company is installing and debugging equipments now.It is estimated that construction of Jianghua Separation Plant will be     

Brief news

正Total transactions of rare earth in Rare Earth Ex-change Center of Hunan South Rare and Precious Metal Exchange neared 40 billion yuan from January to October From the opening in January of this year to the end of October,the total transaction of rare earth products in Rare Earth Exchange Center of Hunan South Rare and Precious Metal Exchange neared40 billion yuan.There are 16 varieties including dysprosium oxide and terbium oxide traded on the exchange center,one of the largest trading platforms for rare earth oxides in China.     

Theoretical basis for optimal collector concentrations and pulp pH values during flotation of sulfide-free minerals

A hypothesis that associates optimal conditions of mineral flotation with a zero charge of their surface is put forward. This hypothesis serves as a basis for a methodology to obtain and verify quantitative physical-chemical models for a minimal necessary concentration of a collector during flotation of sulfide-free minerals. These models may be of use for upgrading engineering processes of flotation and as a job for the concentration plant automation systems. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 89–99, March–April, 2006.     

基于LPWAN技术的采煤沉陷区杆塔倾斜监测系统

随着地下采煤活动不断加大，越来越多的输电杆塔不可避免地被建设在煤矿沉陷区。目前，现有手段采用靠人力去进行定期检查一定会浪费大量的人力和物力，因而需开展对位于煤矿沉陷区的杆塔进行实时在线检测。基于NB-IoT和LoRa提出了一种新的算法——低功耗广域网（LPWAN）技术，提出了一种新型的输电杆塔倾斜监测系统，其中包含1个主节点和多个子节点，以适应地域广和远距离的需求信息监控。该系统通过LoRa多节点网络的数据传输，将杆塔的倾斜参数通过NB-IoT上传至在线实时监控系统。管理人员可以从后台得出监测数据并分析结果，及时对处于煤矿沉陷区的有故障的输电杆塔进行针对性的维护。     

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