钼钴废催化剂回收利用的研究

进行了从钼钴废催化剂中回收提取Mo、Co、Bi、Ni的试验研究。采用先碱浸回收Mo,再酸浸分离Co、Bi、Ni,可有效回收钼钴废催化剂中的有价金属。     

从废钴钼催化剂中分离回收钴、钼的方法

一种从废钴钼催化剂中分离回收钴、钼的方法,其主要包括酸溶、萃取钼和萃取钴等工艺,将经过焙烧粉碎的废钴、钼催化剂粉料用浓盐酸酸溶制成酸溶清料液,将酸溶清料液用磷酸三丁酯和煤油的混合液萃取钼,萃余液在用三辛胺溶剂油萃取钴。利用本发明工艺方法从废钴钼催化剂中分离钴、钼的收率高,钴的实际收率在99．5％以上,钼的实际收率在99．2％以上,各元素相互之间分离完全,最终产品质量好,整个过程无工艺废水废气排放,仅在酸溶工序有少量废渣排出,排出的废渣量仅为处理废料量的2％,排出的废渣中含氧化钴〈0．1％,含氧化钼〈1．5％,消除了废钻、钼催化剂的毒性对环境的威胁。     

钼钴废催化剂回收利用的研究

进行了从钼钴废催化剂中回收提取Mo、Co、Bi、Ni的试验研究。采用先碱浸回收Mo，再酸浸分离Co、Bi、Ni，可有效回收钼钴废催化剂中的有价金属。     

加压浸出-萃取法从钼钴废催化剂中回收钼

采用加压浸出从钼钴废催化剂中分离钼，在原料摩尔比Na2CO3／Mo=1．3，浸出温度150℃的条件下，钼的浸出率达90％。浸出液经酸化处理后采用N搿萃取回收，在有机相为20％N225-10％异辛醇-煤油的条件下，经4级萃取钼的萃取率可达到99．6％。反萃液经酸沉回收钼，产品钼酸铵质量较好。本工艺流程简单、有价金属回收率高、对环境友好。     

含钼催化剂综合回收工艺研究

主要研究废催化剂中钼、钴、镍的酸浸、萃取和碱浸提钼两种工艺。通过实验比较，提出从废催化剂中综合回收有价金属的工艺路径。     

从含钼废触媒中提取贵金属的研究

本文叙述了含钴、钼、镍、钒废催化剂中有价金属的综合回收新方法和工艺过程。     

一种从废催化剂中提取钴的新方法

石油化工和石油炼制工业中需要使用大量的钴钼系列催化剂,如加氢脱硫催化剂、耐硫变换钴钼催化剂等。合成氨工业中,钴钼系列催化荆以其优良的耐硫性能及低温活性收到广泛青睐,全国氮肥行业使用的一氧化碳变换催化剂有相当一部分是钴钼系列催化剂。我国以煤和渣油为原料的大、中、小型合成氨厂几乎全都使用钴钼耐硫变换催化剂。     

钼系催化剂的生产技术(续2)

阐述了新型高活性、低成本Fe-Mo-Cr/Al2O3耐硫变换催化剂和Fe-Mo系无铬(中)高温变换催化剂的生产方法和应用效果,介绍了C1化学中几类重要的含钼催化剂的开发及应用情况,详述了从废催化剂中回收钴、钼的新工艺.     

从废钼合金催化剂中提取钼等有价元素方法的研究

ＭｏＣｏＮｉ合金料首先氧化焙烧碱浸出，滤饼再加纯碱焙烧水浸出使钼与钴镍分离，最后用萃取法分离钴镍的工艺流程，对废钼合金催化剂进行了综合回收。采用该工艺流程和生产线分别生产出合格的工业级钼酸钠、氧化钴和氧化镍。     

从失效催化剂分离和回收金属

从失效催化剂分离和回收金属日本佐贺大学应用化学系研究了从失效的加氢脱硫催化剂中分离和回收稀有金属的方法。他们用硫酸浸出失效的加氢脱硫催化剂，产出一种富含钼、钒、钴、镍及大量铝的酸性溶液。为了从这种溶液中分离和回收稀有金属，以普通的酸性有机磷试剂和ＴＲ...     

Effect of rare earth and other cationic promoters on properties of CoMoN_x/CNTs catalysts for ammonia decomposition

Carbon nanotubes(CNTs)supported Co-Mo nitride catalysts were prepared by incipient-wetness impregnation method and temperature-programmed reaction in N2-H2 mixed gases.The effects of cationic promoters(K,Ba,La,Ce and Zr)on the catalytic performance and surface properties were investigated.All samples were characterized by N2 physical adsorption,X-ray diffraction,and temperature-programmed reduction of H2.The results showed that the addition of promoters reduced the crystallite size of Mo2N and Co3Mo3N species and increased their surface area and dispersion.Among the catalysts,the La promoted CoMoNx/CNTs catalyst had the highest ammonia conversion which could reach 97.63% at 600 oC.     

稀土和钼对铁系中温变换催化剂反应性能及表面性质的影响

以稀土和钼为助剂用浸渍法和混碾法制备出一系列无铬铁系催化剂，同时运用ＸＲＤ、ＴＰＲ和ＴＰＤ对催化剂的表面性质和ＣｅＯ２、ＭｏＯ３的作用进行了研究。实验结果表明，ＣｅＯ２、ＭｏＯ３能较大幅度地增加铁系催化剂的活性。ＣｅＯ２与ＦｅＯ３－ＭｏＯ３催化剂之间发生了相互作用，ＭｏＯ３能改善催化剂的氧化步骤，水的配位吸附是中温变换反应的低温活性中心，解离吸附是中变反应的高温活性中心。     

钼矿石中钼的化学物相分析

建立了钼矿石中钼的物相分析方法，实验数据证明用浓氨水浸取钼华，２％Ｈ２ＳＯ４－１０％柠檬酸浸取钼白钨矿，２０％ＫＯＨ溶液浸取钼铅矿的深剂条件是成功的。本文法已用于生产实践，结果令人满意。     

溶剂萃取法从加压浸出液中提取钼

硫化钼精矿的处理方法通常采用氧化焙烧法,但在中国,该方法存在的最大问题是低浓度SO2污染。近年来,一些可行的工艺被研究,如加压浸出(POX)-萃取(SX)工艺。北京矿冶研究总院(BGRIMM)采用该工艺进行了一系列的试验研究,研究结果表明,采用该工艺钼总回收率大于97%。加压浸出过程中有15%～20%的钼进入溶液,该部分钼可采用溶剂萃取的方法进行提取,在有机相组成N235+煤油,O/A=3/1,混合时间3min的条件下,钼的萃取率可达到98%以上,负载有机相采用25%的氨水反萃,O/A=1/3,在两级逆流萃取的条件下钼反萃率超过98%。今后在中国,POX-SX工艺在钼提取方面是一个非常具有竞争优势的工艺。     

钒钼矿中钼的测定

对钒钼矿中的钼的测定进行了探讨。采用苯羟乙酸-氯酸钾-EDTA-酒石酸体系,加入抗坏血酸-ED-TA消除钒及锡的影响,用催化极谱法测定钼的含量。试验了浸出条件、酸度及主要试剂对本方法的影响。方法简单,灵敏度高。测定范围：0．0005％-5％。     

EDTA差减滴定法测定钼精矿和钼焙砂中钼含量

用盐酸羟胺还原钼(Ⅵ)至钼(Ⅴ),EDTA络合钼(Ⅴ)及共存离子,锌盐滴定过量EDTA求得合量。于等量试液中不加盐酸羟胺,EDTA络合共存离子,滴定至近终点用酒石酸钾钠掩蔽钼(Ⅵ),锌盐滴定过量EDTA求得分量。二者之差即为钼量。2%～5%钨(Ⅵ)、铬(Ⅵ)或钒(Ⅴ)等共存离子不干扰测定。测定10.00～15.00 mg钼,相对误差-0.20%～+0.20%,测定37%～57%的钼含量,相对标准偏差0.10%～0.15%,样品加标准回收率99.60%～100.80%。方法结果准确度与钼酸铅重量法的一致,但本法选择性好、分析快速。     

Influence of copper content on structural features and performance of pre-reduced LaMn_(1-x)Cu_xO_3 (0≤x<1) catalysts for methanol synthesis from CO_2/H_2

A series of pre-reduced LaMn1-xCuxO3 (0≤x<1) catalysts for methanol synthesis from CO2 hydrogenation were prepared by a sol-gel method. The catalytic performances were strongly dependent on the copper content. XRD investigation revealed that the single perovskite structure could be preserved after being reduced, when the substitution for Mn by Cu was less than 50%. The Cu-doped (x=0.5) LaMnO3 was much more active than the other catalysts for reaction, showing CO2 conversion up to 11.33% and methanol selecti...     

低品位含铜钼精矿综合回收新工艺研究

采用焙烧—二段氨浸—萃取—反萃—铜电积—硝酸沉钼工艺流程处理低品位含铜钼精矿,最终产品为电解铜和钼酸铵。结果表明,铜回收率达到95%以上,钼回收率达到93%以上,产品均达到国标一等品标准。     

Catalytic performance for methane combustion of supported Mn-Ce mixed oxides

A series of supported Mn-Ce mixed oxide catalysts were prepared by the impregnation method and used for the oxidation of methane. The catalysts were characterized by N2 adsorption （BET）, X-ray diffraction （XRD）, laser Raman spectrum （LRS）, and temperature programmed reduction （TPR） techniques. The XRD and LRS results confirmed the high dispersion of active components or formation of solid solution between manganese and cerium oxides in the bulk and on the surface of mixed oxide catalysts. The reducibility was remarkably promoted by the stronger synergistic interaction between the two oxides from H2-TPR measurements. As expected, all the experimental mixed oxide catalysts showed excellent activity for methane combustion at low temperature. Especially, for the catalyst with Mn-Ce ratio 3：7, methane conversion reached 92% at a temperature as low as 470 ℃.     

Magnetic Properties and Activity of Pt-Er/γ-Al2O3 Catalysts

A series of Pt-Er/γ-Al2O3 catalysts containing 0.5%(mass fraction) platinum and 0.05%-1.5% Er were prepared by impregnation of γ-Al2O3 supported with different concentrations of erbium chloride solution. The surface properties of the catalysts were studied by methods of temperature programmed reduction and temperature programmed desorption. The magnetic behavior of Pt-Er-γ-Al2O3 catalysts were studied with a Faraday magnetic balance and the results show that the addition of Er can affect the surface properties, the catalytic activities, and magnetic behavior of the reforming catalysts. It is found that there is a corresponding relationship between the susceptibility and selectivity of Pt-Er-γ-Al2O3 catalysts. The experimental results show that Er plays the role of electron promoter.