添加剂对煤-水界面性质的影响与效能研究

将木质素磺酸钠和经化学改性后的木质素磺酸钠用于大同煤制浆。通过测定吸附量、润湿热和ξ－电位，分析了煤－水分散体系界面性质与添加剂效能的关系。从而把水煤浆成浆性与煤粒表面物化性质联系起来，对进一步探讨成浆机理，筛选、合成水煤浆添加剂具有一定的指导意义。     

改性木质素磺酸盐水煤浆添加剂的性能研究

经化学改性后的木质素磺酸钠作为水煤浆添加剂用于盘江煤制水煤浆，最高制浆浓度达到71％，浆的稳定性有明显改善。实验借助流变仪研究了浆的流变性能，并通过对吸附量和ζ电位的测定，研究了煤水分散体系界面性质对水煤浆成浆性的影响。     

木质素磺酸钠对水煤浆稳定性的影响研究

论文研究了中国矿业大学(北京)研制的萘系分散剂KY33与两种不同变质程度煤的制浆效果以及添加木质素磺酸钠对水煤浆的稳定性的影响。通过制浆试验,合理选择配比进行制浆,确定KY33的最佳用药量,并通过添加木质素磺酸钠来提高水煤浆的稳定性。利用Turbiscan Lab稳定性分析仪对复配药剂制备的水煤浆的稳定性进行评价。结果表明:不同变质程度的煤对应的KY33最佳用药量不同,但添加适量木质素磺酸钠均可有效的提高浆体的稳定性。     

造纸黑液制取水煤浆添加剂的研究

利用造纸黑液中的木质素、有机酸和聚糖类化合物，在一定条件下进行磺化、缩合、改性制取质优价廉的水煤浆添加剂，其对义马煤所制水煤浆（煤浆浓度63％）流动性好，性能稳定，性能达到或超过目前国内工业TEXACO气化装置所用的添加剂。介绍了试验情况，并对试验结果进行了探讨。     

不同分散剂及添加量对神木煤成浆性能的影响

为了比较萘磺酸甲醛缩合物(萘系)、脂肪族、聚羧酸系、木质素磺酸钠4类分散剂在水煤浆制浆过程中的作用及效果,通过成浆性试验研究了不同分散剂对神木煤成浆的最高浓度、黏度和流动性的影响规律,并分析了不同添加剂的性能差异及其分散作用机理。结果表明:在分散剂添加量为0.2%时,分别使用萘系、脂肪族、聚羧酸系、木质素磺酸钠作为分散剂,制得神木煤浆最高浓度分别为65.97%、67.74%、66.54%和67.61%。不同分散剂的分散性能从优到劣为萘系、脂肪族、聚羧酸系、木质素磺酸钠,分散剂阴离子的匹配效果为磺酸基羧基羟基。以萘系分散剂研究分散剂添加量对神木煤水煤浆黏度的影响,发现分散剂的饱和吸附量为0.6%,随着分散剂添加量增加,水煤浆黏度降低,到达饱和吸附量后黏度反而增大。     

改性木质素分散剂对褐煤水煤浆流变性的影响

以廉价可再生的改性木质素作为分散剂,研究了宝日希勒褐煤的成浆性能;利用正交试验,考察了煤的配比、浆体温度、改性木质素分散剂用量和pH值对成浆性能的影响;利用单因素试验,研究了pH值、煤的配比、分散剂用量和制浆温度等因素对水煤浆流变性的影响。结果表明,各因素对浆体流变性影响大小顺序为:煤的配比>浆体温度>分散剂用量>pH值;在25℃,煤的配比为30∶20,分散剂用量为0.3%以及pH值=4的优化条件下,该煤成浆的最大浓度达56.1%,与原料木钠相比,改性木质素成浆浓度提高了4.1个百分点。     

温度及剪切时间对水煤浆表观黏度及流变性影响

针对低阶煤难以单独制备高浓度水煤浆的问题,分别采用木质素系、萘系、脂肪族分散剂对神华煤制浆.考察了制浆温度和剪切时间对神华煤水煤浆表观黏度和流变特性的影响.结果表明,改性木质素系和脂肪族分散剂可以制备具有工业应用价值的水煤浆,在制浆的质量分数为60%左右时,其浆体具有优良的抗剪切性能.     

不同分散剂在低阶煤制水煤浆中的作用机理研究

为了解分散剂对低阶煤成浆性的作用机理,应用氨基磺酸盐、木质素磺酸钠和萘系磺酸盐3种分散剂对鄂尔多斯东胜煤田褐煤的成浆性能进行研究。通过紫外-可见分光光度计检测了不同分散剂在煤表面的吸附量,测量了不同分散剂对煤表面Zeta电位的影响,并探讨了分散剂种类和用量对水煤浆流变性能的影响。结果表明,3种分散剂中氨基磺酸盐对低阶煤制水煤浆的分散作用最好,木质素磺酸钠与氨基磺酸盐复配也表现出优良的分散性能;分散剂的分散性能与吸附量和Zeta电位具有一致性,分散剂复配后的吸附量和Zeta电位明显增加。带电的分散剂分子吸附到煤颗粒上,既增大了煤颗粒的空间位阻,也增强了煤颗粒之间的静电斥力,静电排斥和空间位阻的共同作用显著提高了水煤浆的分散性。     

分散剂改性木质素磺酸钠的制备及吸附性能研究

为提高水煤浆分散剂木质素磺酸钠的水溶性和负电性,以木质素磺酸钠(LS)、甲基丙烯磺酸钠(SMAS)和烯丙基聚氧乙烯醚(APEG)为原料,通过水溶液聚合法合成了木质素磺酸钠的接枝共聚物(LS-APEG-SMAS),通过傅里叶红外光谱(FTIR)对产物结构进行表征,并将其分散剂用于神华煤制浆。考察了吸附时间和分散剂浓度对饱和吸附量的影响,测定了分散之后煤的Zeta电位;采用傅里叶红外光谱表征了分散前后煤中官能团的变化,利用环境扫描电镜(ESEM)观察了分散前后煤的表观形貌。结果表明:当分散剂质量浓度为600 mg/L时,在25℃吸附12 h饱和吸附量达到8 mg/g,分散过程中Zeta电位由-8.54 mV降低到-31.5 mV,表明分散剂木质素磺酸钠的接枝共聚物对神华煤具有良好的分散稳定性。     

聚苯乙烯磺酸钠磺化度对水煤浆性能影响的研究

选用三种不同煤化程度的煤样和四种不同磺化度的聚苯乙烯磺酸钠制备水煤浆,主要研究自制水煤浆添加剂的磺化度对制浆性能的影响.研究表明:聚苯乙烯磺酸钠水煤浆添加剂具有良好的分散性能和稳定性;不同煤化程度煤制浆的表观粘度均随着磺化度的增大,呈现先增大后减小的趋势;当聚苯乙烯磺酸钠磺化度为59.87%时,三种煤制浆的稳定性良好.     

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.     

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