从钼精矿焙烧烟尘中分离回收烯有金属铼

通过采用伯胺Ｎ１９２３与中性膦ＴＢＰ组成的协同萃取体系,分离回收钼精矿焙烧烟尘中微量铼的工艺流程,比较了此体系在不同条件下对铼（ＶＩＩ）、钼（ＶＩ）等离子的萃取效率和分离效果。铼在萃取过程中浓缩了２０倍以上,整个回收工艺流程简单、分离效果较好。     

从辉钼精矿中提取钼,铼的研究

本文阐述全湿法(氧气压煮法)从辉钼精矿中制取仲钼酸铵和高铼酸铵的新工艺流程,具有收率高(钼95.08％、铼96.28％)、原材料单耗低、产品质量好、技术经济指标先进的优点。     

活性炭吸附法分离铼钼的研究

活性炭吸附法分离铼钼的研究表明,调整吸附液的pH值,使铼钼能有效分离,且当pH>8.2时,分离系数SRe/Mo>3042,铼的吸附符合Freundlich等温式,即lga=0.69+0.81lgc。     

D301树脂分离钼与铼条件的确定

稀有金属铼是当代新技术领域的重要生产材料,它常与钼精矿伴生共存,其性质与钼极其相似。目前,我国常采用有机溶剂萃取法从焙烧钼矿烟气中回收钼和铼,虽然回收率较高,但工艺流程长,液体有机相易燃烧,储存不便,易造成环境污染。由于离子交换树脂吸附量大、吸附速度快、可以循环使用、不危害人体和环境,工业化成本低,受到广泛关注。通过查找文献了解到,目前国内应用离子交换树脂对含有钼和铼的溶液进行工业分离的研究较少。因此,本实验研究D301树脂对含钼和铼的溶液的吸附性能,并确定了D301树脂分离钼和铼的最佳条件。     

辉钼矿中钼和铼分离过程研究

采用D201树脂对辉钼矿氯酸钠浸出体系所得反萃液中的钼、铼吸附分离性能进行考察。试验结果表明,树脂对溶液中的铼具有良好的吸附选择性,在吸附温度为30℃,pH=8的条件下吸附1 h,钼、铼吸附率分别为3.26%、93.18%,分离因子为197.68,能够满足钼、铼分离提纯的需要。吸附过程符合Boyd液膜扩散方程,树脂对钼、铼的吸附过程受液膜扩散控制。     

D301树脂对钼矿烧培烟气吸收液中钼和铼的分离工艺的研究

本文模拟了钼矿烧培烟气吸收液,通过四次试验对分离工艺进行了研究和探讨,得出了用该方法分离两种贵金属的结论,并对采用类似方法分离钼和铼的实验人员给出建议。     

以辉钼精矿为原料制取钼酸铵和铼酸铵新工艺

本文介绍了全湿法(氧气压煮法)从辉钼精矿中采用硝酸催化氧气压煮;运用聚醚沉硅预防乳化;采取同一萃取剂——N235(混合三烷基胺)萃取分离和提取相铼;再用氨水反萃取;最后经净化、结晶分别制取仲钼酸铵和高铼酸铵的新生产工艺。新工艺钼铼收率高(钼96.08%,铼96.28%),原料和辅助材料单耗低,产品质量好,技术经济指标达到并超过了国内和世界先进水平。     

从废催化剂中回收钼

从废催化剂中回收钼是利国利民的重要研究课题，针对当前回收工作中存在的技术问题进行了认真的探索，成功地解决了回收中分离、沉淀等技术难题，设计出了较为有效的回收工艺，对焙烧条件、钼酸制备等问题进行了全面阐述。     

从钴—钼废催化剂中回收钼

改进了以前从临氢脱硫废催化剂经焙烧和浸取制备钼酸铵的方法。将以往的调酸过滤再氨溶改为加有机溶剂直接沉淀分离     

酮类试剂萃取分离铼的研究

简述了碱性体系中酮类试剂对铼的萃取分离研究，研究了萃取率与萃取剂用量、体系碱性浓度以及金属离子浓度等之间的关键，并比较了含氧萃取剂及酮类试剂间对铼的萃分离的能力。丙酮对铼的萃取分离已用于岩石中痕量铼的实际分析测定。     

Extraction and separation of molybdenum(VI) from acidic media by fatty hydrazides

BACKGROUND: The increasing demand for molybdenum has encouraged the development of low‐cost and environmentally friendly extractants to recycle and recover this metal. In the present study, solvent extraction of Mo(VI) from acidic media using a mixture of fatty hydrazides synthesised from palm olein as the extractant was carried out. The effects of various parameters such as acid, diluent, contact time, extractant concentration, metal ion concentration and stripping agent and the separation of Mo(VI) from other metal ions such as Co(II), Ni(II), Al(III) and Mn(II) were investigated. RESULTS: It was found that the extraction of Mo(VI) into the organic phase involved the formation of 1:3 complexes. Mo(VI) was successfully separated from commonly associated metal ions such as Ni(II), Co(II), Al(III) and Mn(II). Mo(VI) stripping from the loaded organic phase was studied using different acidic and alkaline solutions and was found to be optimal with ammonium hydroxide solution. CONCLUSION: These results are useful for the development of a method to recover Mo(VI) from acidic media utilising fatty hydrazides as the extractant. Copyright © 2008 Society of Chemical Industry     

不锈钢电炉烟尘的环境浸出行为研究

对不锈钢电炉烟尘的基本特性和环境浸出行为进行了研究.结果表明,该烟尘中Fe,cr,Ni和Zn含量较高,主要物相是铁铬尖晶石和石英,具有潜在回收价值;烟尘略显酸性,具有较好的流动性,其中Cd含量超过了国家标准,是一种有毒固体废弃物;烟尘应尽量避免堆放或填埋在低pH场所,以防止其中的重金属离子浸出;不同的浸出液对烟尘中Cr(Ⅵ)浸出能力的影响不同,其中以1 mol/L硝酸为浸出液,Cr(Ⅵ)浸出量最大,0.1 mol/L冰醋酸溶液最小.随浸出时间的延长、浸出液温度升高和固液比增大,Cr(Ⅵ)浸出量增加.     

采用N235从含Mo,Mn酸浸液中萃取回收Mo

基于软锰矿的强氧化性和辉钼矿的还原性及资源的综合利用,开发出软锰矿与辉钼矿共同焙烧新工艺,焙砂的处理及Mo, Mn分离是该新工艺的关键. 采用N235(20%)+仲辛醇(10%)+磺化煤油(70%)作为萃取剂,从含Mn, Mo焙砂酸浸液中萃取回收Mo,实验得出优化工艺条件为：萃取温度室温(25℃),相比O/W 1:2,错流萃取级数3级,水相中硫酸浓度CH2SO4≤100 g/L;反萃时先用70 g/L的硫酸溶液对萃取有机相进行洗涤,反萃剂采用17%的氨水,反萃温度为室温,相比O/W为1:2,萃取级数为3,此条件下Mo的萃取率及反萃率分别达到99.9%和99.4%.     

从电炉炼锌烟尘及其酸浸出渣中综合回收有价金属的工艺研究

系统地研究了从电炉炼锌烟尘及其酸浸出渣中综合回收铟、锡、铅、锌等有价金属的新工艺,考察了硫酸浸取锌、铟,盐酸浸取铅、锡的最佳工艺控制条件。该工艺方法能够有效地回收电炉炼锌烟尘中的铟、锡、铅、锌等有价金属,工艺简单实用,原料综合利用率高,无环境污染等特点。铟、锡、铅、锌的回收率分别可达82%、98%、97%和95%。     

Separation of Simulated Mixed Mo(VI) and V(V) From HNO3 and HCl Solutions by Selective Extraction and Stripping with Tri-N-Butyl Phosphate as Extractant

Equilibrium study was carried out to determine the optimum conditions required for Mo(VI) extraction from HNO₃ solutions and subsequently, simulated mixed Mo(VI), and V(V) were extracted from HNO₃ (pH = 1.0) and 6.0 mol L^?1 HCl solutions with TBP dissolved in n-hexane. The variation of pH (selective extraction) and selective stripping were investigated as methods of separation of Mo(VI) and V(V). The latter method was found inefficient for separations from HNO₃ solutions (pH = 1.0) except supplemented with selective stripping (back-extraction with 2.0 mol L^?1 H₂SO₄/14.5 mol L^?1 NH₄OH). While from 6.0 mol L^?1 HCl, selective stripping was adequate to quantitatively strip in turns the Mo(VI) and V(V) co-extracted into the TBP phase. About 100% of the co-extracted V(V) from the HCl medium was stripped in a two-stage process, in contrast to a single-stage required for Mo(VI) of the same result. The selective stripping method was found to be better because an initial appreciable co-extraction had occurred prior to stripping separation. Based on analytical and spectra data, the extracted complexes from HNO₃ and HCl media were formulated as ((MoO₂)_7–8n(VO₂)_2n · (NO₃)₁₆) ^(16–18)n- · m TBP (where n>m) and (MoO₂Cl₂ · VO₂ Cl) · xTBP, respectively.     

Comparison of Two Solvent Extraction Systems for the Separation of V(V) and Cr(VI) from an Industrial Leaching Solution

Two solvent extraction systems for V (V) and Cr (VI) separation in leaching solution were investigated in order to select the suitable separation method for the disposing of chromium-bearing vanadium slag. The best/suitable system was determined by extraction yield (E_V,%) and the separation factor of V(V) and Cr(VI) (β_V/Cr). On the condition of 1:1 molar ratio of H⁺ to vanadium (V), the E_V values were 99.8% and 95.1%, while the β_V/Cr values were 546.58 and 29.53 using the two different systems, respectively. The extraction reactions for system 1 were determined by the slope method, and the chemical equilibrium constants were obtained.     

烟道气中回收CO2

本文讨论从烟道气中回收ＣＯ２的方法，着重介绍了自贡鸿鹤公司采用改良ＭＥＡ法的经验，该厂自行试验并筛选确定复合型缓蚀剂，并改进了有关流程，取得了良好的效果。     

电炉粉尘资源化与固硫剂的开发研究

本文探讨了利用电炉炼钢粉尘进行型煤燃烧固硫和烟道气脱硫的可能性,实验测定和理论计算了典型的电炉粉尘的硫容量约为5．5mmol／g;当其作为型煤固硫添加剂时,固硫效果显著;当其作为烟道气脱硫剂时,脱硫率可达95％以上,反应活性很高。进一步加工,有望发展为固定床用脱硫剂,达到以废治废的目的。     

电炉粉尘资源化与固硫剂的开发研究①

本文探讨了利用电炉炼钢粉尘进行型煤燃烧固硫和烟道气脱硫的可能性,实验测定和理论计算了典型的电炉粉尘的硫容量约为5．5mmol／g;当其作为型煤固硫添加剂时,固硫效果显著;当其作为烟道气脱硫剂时,脱硫率可达95％以上,反应活性很高。进一步加工,有望发展为固定床用脱硫剂,达到以废治废的目的。     

高砷烟道灰预处理水浸液中锌砷分离

对经热水浸出的高砷烟道灰水浸液进行锌砷分离,基于单独使用Fe2(SO4)3和CaO除砷的实验结果,提出了Fe2(SO4)3-CaO耦合分离锌砷工艺. 结果表明,在溶液pH=2、摩尔比H2O2/As3+ 1.3:1, Fe3+/As5+ 1:1.5, Ca2+/As5+ 1.5:1及反应温度70℃、反应时间1.5 h的条件下,砷脱除率超过80%,锌没有损失,实现了锌砷高效分离.