粉煤灰和C3N4复合材料对含铬废水的处理

粉煤灰是中国主要的工业废弃物之一,粉煤灰是一种多孔性、具有较大比较面积的固体颗粒,具有一定的吸附能力,可用于重金属的处理,起到以废制废的效果。C_3N_4作为一种非金属可见光响应新型的光催化剂,在光催化研究方面广泛用于降解重金属废水。本文通过研磨混匀处理制成粉煤灰和C_3N_4的复合材料。单因素试验使用粉煤灰和C_3N_4复合材料处理含铬废水,并对操作条件进行选择和优化,单因素试验结果表明,当粉煤灰和C_3N_4投加量40g/L,pH值2,吸附时间40 min,吸附剂配比为C_3N_4含量为5%的条件下,Cr6+去除率可达89.2%。对比试验发现粉煤灰和C_3N_4复合材料的去除效果优于纯粉煤灰。碱改性粉煤灰的去除率能达到92%以上,而粉煤灰和C_3N_4复合材料的去除率略低于90%,进一步研究考虑使用其他方式制备复合材料。     

改性粉煤灰吸附处理含铜废水研究

采用高分子絮凝剂聚二甲基二烯丙基氯化铵(PDMDAAC)对粉煤灰进行改性,通过正交试验研究改性粉煤灰处理含铜废水。实验结果表明:改性粉煤灰用量为3.0g,吸附平衡时间90 min,pH=10时,铜去除率可达97%。该工艺简单,以废治废,成本低廉,具有良好的应用前景。     

响应曲面法优化CaS_x-合成沸石联用处理电镀废水

为提高多硫化钙-粉煤灰合成沸石联合处理高浓度混合酸性电镀废水的处理效果,利用响应曲面法对处理条件进行优化。在单因素试验基础上,根据Box-Behnken试验设计原理,建立二次多项式响应曲面模型。结果显示模型合理可靠,模型优化结果预测pH值为4、Ca S5投加量为理论值的1.75倍、合成沸石投加量为0.075 g/m L时,处理效果最佳。实测该条件下6价铬去除率为99.98%,总铬去除率为99.94%,与模型预测值相吻合。     

聚氯硫酸铝铁的结构及初步应用研究

粉煤灰是电力工业和燃煤锅炉产生的一种工业固体废物，利用粉煤灰为主要原料制备出了聚氯硫酸铝铁（PAFCS）新型无机高分子絮凝剂。比较了该絮凝剂和聚合氯化铝（PAC）絮凝剂对模拟水样的净水效果，结果表明，该絮凝剂的除浊效果和沉降效果要优于聚合氯化铝（PAC）。     

粉煤灰作为土壤改良剂的试验研究

本文阐述了用粉煤灰作为土地复垦、土壤改良剂的试验，初步提出粉煤灰与一定量的农家肥、化肥配制成“复合肥料”，粉煤灰起了重要作用。以废治废，既节约粉煤灰的处理费用，又加快了土地复垦的进程。     

粉煤灰作为土壤改良剂的试验研究

本文阐述了用粉煤灰作为土地复垦、土壤改良剂的试验，初步提出粉煤灰与一定量的农家肥、化肥配制成“复合肥料”，粉煤灰起了重要作用。以废治废，既节约粉煤灰的处理费用，又加快了土地复垦的进程。     

煤基复合絮凝剂对高浊度高矿化度矿井水的絮凝效果研究

煤矿分布式地下水库在神东地区应用取得显著成果，宁东地区已开始论证其可行性，但宁东地区矿井水多为高浊度高矿化度矿井水，需要对水库入水进行预处理。本文采用以粉煤灰为原料，通过与聚丙烯酰胺（PAM）、聚合氯化铝（PAC）、壳聚糖混合得到处理高浊度高矿化度矿井水的絮凝剂，试验对比了粉煤灰基复合絮凝剂和未加粉煤灰絮凝剂的絮凝效果，并探究了粉煤灰基絮凝剂的影响因素，确定了最佳投加量和试验条件。实验结果表明:① 5个处理组中对矿井水的处理效果依次是:PAM+PAC+壳聚糖+粉煤灰>PAM+PAC+壳聚糖>PAM+PAC>PAM>PAC；② 粉煤灰基复合絮凝剂的最佳絮凝条件为温度25℃、pH值7、搅拌强度220 r/min、搅拌时间20 min；③ 在最佳条件下，复合絮凝剂对矿化度、悬浮物、钙离子、总硬度和硫酸根的去除率分别为1216%、9804%、8057%、7786%和9544%；④ 粉煤灰基复合絮凝剂作为地下水库处理高浊度高矿化度矿井水预处理絮凝剂是可行的。本研究为地下水库进水的絮凝等预处理提供理论依据和技术支撑。     

粉煤灰处理含铅废水的试验研究

在对粉煤灰的吸附性能进行分析的基础上,对粉煤灰处理含铅废水进行了试验研究,并对其影响因素进行了探讨,得到了最佳处理条件。试验表明,粉煤灰吸附铅的最佳条件为:时间为12h,灰水比为1∶10,pH值为7.5,温度为30℃。在此处理条件下,粉煤灰对铅的去除率达到94.3%。     

TBAB改性粉煤灰处理印染废水的实验研究

用TBAB(四丁基溴化铵)对粉煤灰进行改性后对印染废水进行脱色处理。以印染废水中存在的活性艳红为处理目标,通过一系列试验,确定较优的改性条件和脱色处理条件。试验结果表明,在TBAB浓度为2.0 g/L,粉煤灰浓度为3.5 g/L,溶液pH为2,吸附时间为1 h时,脱色率可达到最高,为91.3%。     

TBAB改性粉煤灰处理印染废水的试验研究

用TBAB(四丁基溴化铵)对粉煤灰进行改性后对印染废水进行脱色处理。以印染废水中存在的活性艳红为处理目标,通过一系列试验,确定较优的改性条件和脱色处理条件。试验结果表明,在TBAB浓度为2.0 g/L,粉煤灰浓度为3.5 g/L,溶液pH为2,吸附时间为1 h时,脱色率可达到最高,为91.3%。     

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,     

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     

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.     

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