氧化铝厂赤泥制备H2S吸附剂的试验与应用

介绍以广西平果铝业公司氧化铝厂赤泥为主要原料制备硫化氢气体吸附剂的工艺及吸附性能。结果表明：吸附剂最佳配方为赤泥80％～85％，助剂15％～20％，辅以赤泥附液为润滑剂；焙烧活化的最佳温度为300～350℃；吸附温度在20～60℃，吸附剂的穿透硫容最大为19．3％。利用该吸附剂净化黄磷生产尾气工业试验，取得了比较理想的结果。     

赤泥负载铈吸附剂的制备及其应用

将赤泥通过盐酸改性,得到改性赤泥,以改性赤泥为载体,氧化铈为活性组分,制备了赤泥负载铈吸附剂.在25℃和静态条件下,对赤泥负载铈吸附剂处理含磷废水进行了研究,探讨了赤泥负载铈吸附剂的制备条件、赤泥负载铈吸附剂用量、废水pH值、吸附时间及磷的浓度对除磷效果的影响.结果表明,赤泥负载铈吸附剂的制备条件为:盐酸浓度为6mol/L,赤泥负载铈的反应时间为16h,四水硫酸铈浓度为0.4g/L,焙烧温度为500℃;在废水pH值为5.0,磷浓度0～100mg/L范围内,吸附时间为90min,按磷与赤泥负载铈吸附剂质量比为1︰80投加赤泥负载铈吸附剂进行处理,磷的去除率可达97%以上.利用Langmuir吸附等温式对吸附数据进行拟合,得到25℃下的线性相关性R2=0.9919,吸附剂的饱和吸附量为44.65mg/g.磷在吸附剂表面的吸附是单分子层吸附.     

赤泥负载镧新型吸附剂的制备及其除氟性能

以盐酸活化的赤泥为载体,氧化镧为活性组分,制备了赤泥负载镧的新型吸附剂.探讨了新型吸附剂制备最佳的条件对除氟效果的影响.结果表明在盐酸浓度为6 mol/L,赤泥负载镧的反应时间为20 h,镧离子浓度为0.25 g/L,焙烧温度为500℃的条件下制备的吸附剂对氟离子具有较强的吸附能力;当吸附时间为60 min,pH值为6.0,氟的初始浓度为40 mg/L,氟与吸附剂的质量比为l:100时,氟去除率可达98%以上.在25℃下,吸附除氟过程符合Langmuir吸附等温式,线性方程为:c_e/q_e=0.015 9c_e+0.049 5,线性相关系数为:R~2=0.992 5,其饱和吸附量为62.89 mg/g.单分子层吸附氟是吸附的主要形式.     

有机改性赤泥吸附剂的制备及除磷性能

通过浸渍CTMAB法制备有机改性赤泥吸附剂,并探讨改性赤泥吸附剂对磷的吸附性能。结果表明：当浸渍液CTMAB质量浓度为8 g/L、焙烧温度为500 ℃、模拟含磷废水初始浓度为5 mg/L、废水pH=3、振荡时间为60 min时,改性吸附剂对磷的去除率达到90%以上。根据试验结果建立了改性吸附剂吸附磷的Freundlich等温线模型,通过热力学分析揭示出该吸附过程可自发进行。     

赤泥颗粒吸附剂吸附水中磷酸根离子动态研究

采用拜耳法赤泥为原料,针对传统烧结法耗能大、成本高的问题,采用非烧结的方法制备颗粒吸附剂,考察以及吸附剂投加量、初始磷酸根浓度、p H值和温度因素对吸附除磷的赤泥颗粒吸附剂对磷酸根的吸附性能影响,吸附实验结果显示对磷酸根的吸附量达到了67. 68 mg/g,优于其他文献报道的吸附剂。基于试验结果,对赤泥颗粒吸附剂对磷酸根的吸附行为进行等温吸附、动力学的数学拟合,伪二级动力学和Langmuir-Freundlich吸附等温式能较好描述赤泥颗粒吸附剂对磷酸根的吸附行为,其相关系数R2均大于0. 98,赤泥颗粒吸附剂对磷酸根的吸附过程既存在多层吸附,也存在单层吸附且符合化学吸附的特点。     

城市污泥-膨润土颗粒吸附剂的制备及其处理含铅废水的研究

通过焙烧实验和振荡吸附实验,研究了城市污泥.膨润土颗粒吸附剂的制备及其在含铅离子废水中的吸附特性.结果表明,颗粒吸附剂制备的最佳组合条件为城市污泥:膨润土=6:4(质量比),粒径为1.2mm,在550℃下焙烧2h;在温度为25℃左右,pH值为4,Pb~(2+)初始浓度为30mg/L、吸附剂用量为10g/L、吸附时间为30min条件下,吸附剂对废水中的Pb~(2+)的去除效率可达92.55%.吸附剂对Pb~(2+)的吸附符合Langmuir吸附方程.     

再生润滑油吸附除臭的实验研究

以活性白土、分子筛、硅胶和活性炭为吸附剂,对再生润滑油进行吸附除臭处理;比较了用吸附剂直接吸附除臭和先絮凝再吸附除臭2种方法对再生润滑油的除臭效果,考察了影响絮凝、吸附的各种因素。结果表明,先絮凝再吸附,效果均较直接吸附除臭有明显的提高,活性白土、硅胶和活性炭的除臭去除率均可达96%以上,分子筛的除臭去除率也可达87%以上;最佳絮凝条件:温度80℃、150mL再生润滑油所需2种絮凝剂用量分别为3.7g和1.3g;最佳吸附条件:吸附温度为70℃,吸附时间为5min(分子筛为30min),吸附剂的用量为2g(活性白土为4g),pH值为10。     

改性硅藻土与细菌复合体对Mn(Ⅱ)的吸附特性及动力学研究

将改性硅藻土作为载体,负载抗锰细菌,制成吸附Mn(Ⅱ)的复合型吸附剂.在Mn(Ⅱ)初始浓度为60～600 mg·L-1范围内,硅藻土-细菌复合体对Mn( Ⅱ)的吸附率＞80%,最大吸附量为56 18mg·g-1,大于单一硅藻土的最大吸附量45.28mg·g-1;在pH值为3.5～10.5范围内,该复合体的吸附率均高于单一硅藻土的,最佳pH值宜为6～8;当温度从25℃上升到80℃,Mn(Ⅱ)的去除率也随之上升.吸附动力学分析显示,该复合体的20mim吸附率可达79%;其对Mn(Ⅱ)的吸附过程符合Langmuir方程(R2=0.99),吸附动力学可用准二级速度方程描述(R2=1).     

锰系和铝系吸附剂对江汉盆地卤水中锂的吸附性能研究

江汉盆地地下卤水锂资源储量丰富,具有很高的工业开发价值。 研究利用 XRD、SEM、BET 对锰系和铝 系锂吸附剂进行了表征,并通过静态吸附试验对比了两种吸附剂对江汉盆地卤水中锂的吸附性能。 锰系吸附剂最佳 吸附条件为:温度 25 ℃ 、pH = 8、液固比 200 mL / g,吸附容量为 3. 93 mg / g;铝系吸附剂最佳吸附条件为:温度 25 ℃ 、pH = 7. 1(原卤)、液固比 400 mL / g,吸附容量为 1. 76 mg / g。 经过 5 次循环试验,锰系吸附剂吸附容量是第一次的 66. 3%,铝系吸附剂吸附容量基本不变,铝系吸附剂的循环稳定性远优于锰系吸附剂。 锰系和铝系吸附剂对 Li+的吸 附符合拟二级动力学模型,是典型的化学吸附。 BET 分析表明锰系和铝系吸附剂均存在介孔结构,锰系吸附剂以大孔 为主,铝系吸附剂以介孔为主。 FTIR 分析表明,锰系吸附剂吸附过程存在 Li⁺-H⁺交换,铝系吸附剂在吸附 Li⁺的同时 会吸附 Cl^-来平衡电荷。     

赤泥复合颗粒去除Fe2+、Mn2+的最佳制备条件探究

利用赤泥、粘结剂、造孔剂,生产配比为94∶1∶5的赤泥复合颗粒,最佳预热温度为400℃,预热时间30 min,焙烧温度为700℃,焙烧时间为20 min.此条件下生产的赤泥复合颗粒散失率低,在pH值为3～4时,去除酸性矿山废水Fe2+、Mn+效果明显,去除量可达9.17 mg/g和9.85 mg/g.     

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.     

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.     

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     

Brief news

正Corun invested another 50 million yuan in power battery for HEV Hunan Corun announced on 27 June that they had signed the cooperation agreement to jointly built Corun(Shaoxing)Autos Power Battery System Co.,Ltd.in Shaoxing Binhai New City.According to the announcement,total registered     

铜熔炼中锍品位对杂质元素分配行为的影响

借助于多相、多成分系统中平衡计算的手段，开发出微量元素砷、锑、铋及伴生元素铅、锌等在铜熔炼中分配行为的计算机模型。利用该模型对铜熔炼过程进行计算机模拟，分析了冰铜品位对砷、锑、铋、铅和锌等杂质元素的分压、活度系数及它们在冰铜、炉渣和气相中分配率的影响，并讨论其热力学分析结果对生产实践的指导意义。     

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,