载铁炭分子筛中铁的存在形态

用Ｍ　ｓｓｂａｕｅｒ谱法测定了载铁炭分子筛中铁的存在形态。结果表明，经焙烧和还原后，担载在炭分子筛上的Ｆｅ（ＮＯ_３）_３有７５％～７７％转变为Ｆｅ_２Ｏ_３，ＦｅＯ，Ｆｅ（ＮＯ_３）_２和Ｆｅ_３Ｏ_４，其中有益于提高炭分子筛空分选择性的磁性Ｆｅ_３Ｏ_４的含量约２９％．     

浏阳胶磷矿贫矿浮选研究

ＮＤＦ是胶磷矿浮选的新型抑制剂,用于浏阳胶磷矿贫矿浮选,闭路试验获得精矿含Ｐ２Ｏ５ ３１．２０％,回收率７９．１８％,含Ｆｅ２Ｏ３ １．９４％,Ａｌ２Ｏ３ ２．４０％的良好指标,研究表明ＮＤＦ是一种有良好选择性的浮选抑制剂,对精矿中的铁、铝杂质赋存状态进行了较详细的研究,指出了精矿中Ｆ２Ｏ３、Ａｌ２Ｏ３难以降低的原因。     

释放螯合滴定法测定镀铬溶液中的铁含量

用ＮＨ４ＳＣＮ、（Ｃ４Ｈ９）２Ｎ＾＋Ｃｌ＾－为释放剂，选择性螯合滴定法测定镀铬溶液中的铁。ＥＤＴＡ螯合Ｆｅ＾３＋和其他阳离子，然后加入ＮＨ４ＳＣＮ和（Ｃ４Ｈ９）Ｎ＾＋Ｃｌ＾－分解Ｆｅ－ＥＤ－ＴＡ螯合物、释放出的ＥＤＴＡ，用Ｉｎ（ＮＯ３）３标准溶液返滴定。实验表明，各种常见阳离子都不干扰测定铁。该法已成功地用于测定镀铬溶液中的铁含量。     

环烷酸萃取法从氯化矿泥水浸液中分离稀土元素 1.萃取前除杂

川西稀土矿泥氯化后水浸液中,稀土含量较低,可借助环烷酸萃取法分离出稀土元素。水浸液组成复杂,导致环烷酸易乳化流失,故萃取前需除杂。着重讨论用高锰酸钾除铁的机理和实验控制条件。     

用N235从HCl—H2SO4混酸溶液中萃取铜（II）的研究

某厂生产化学品排放的含铜废酸液中，含铜８～１２ｇ／ｌ废酸的浓度高达５～６ｍｏｌ／ｄｍ＾３，我们先用Ｎ２３５萃取铜，提取铜后的废液供钢铁厂作酸洗液。本文从ＨＣｌ－Ｈ２ＳＯ４混酸溶液中对Ｎ２３５萃取铜的条件，萃取平衡反应以及萃合物组成等进行了研究。     

HNO3氧化煤系硫铁矿生产聚铁的方法及装置

设计出一套利用ＨＮＯ３ 催化氧化煤系硫铁矿（ＦｅＳ２） 生产聚合硫酸铁（ＰＦＳ） 的反应系统, 包括ＦｅＳ２ 氧化反应器、Ｆｅ２＋ 氧化反应器、循环泵和射流器等．利用该反应系统实现了ＨＮＯ３及其氧化ＦｅＳ２ 放出ＮＯｘ 和引入Ｏ２ 氧化ＦｅＳ２, 生产ＦｅＳＯ４ 和Ｈ２ＳＯ４, 同时用ＮＯｘ＋ Ｏ２ 催化氧化ＦｅＳＯ４, 生产聚合硫酸铁的目的． 该方法具有ＨＮＯ３ 用量少、系统密封、无污染、催化剂循环使用、反应速度快、经济效益和环保效益好等特点．     

化成法硫酸酸解硫铁矿渣

采用化成法对硫铁矿渣进行硫酸酸解，熟化料萃取后获得高浓度含Ｆｅ溶液（１７９．８ｇ／Ｌ），该溶液可用于氧化铁红颜料等铁系列产品的生产。     

二次氮化法制备γ′－Fe_4N超细粉末

以ＦｅＣｌ＿２·ｎＨ＿２Ｏ和ＮＨ＿３为原料，采用一步气相合成法制备了Ｆｅ／Ｎ超细粉末，并研究了二次氮化法制备氮化铁超细粉末的工艺技术。通过比较实验，证实二次氮化法能够制备单相的γ′－Ｆｅ＿４Ｎ粉末。利用ＸＲＤ、ＴＥＭ、ＸＰＳ和ＶＳＭ等实验手段对Ｆｅ／Ｎ和γ′－Ｆｅ＿４Ｎ粉末的晶态、物相、形貌、成分、粒度和磁性进行了初步表征。实验结果表明，二次氮化法制得的γ′－Ｆｅ＿４Ｎ为高纯、超细、单相的粉末，并且粉末的饱和磁化率σ＿３和矫顽力Ｈｃ值均优于田中隆夫等人的同类研究结果。     

光氧化降解农用地膜的研究

研究了添加光敏剂二丁基二硫代氨基甲酸铁（ＦｅＤＢＣ）、乙酰丙酮铁（ＦｅＡｃＡｃ）、苯并蒽酮（ＢＡＮ）的光氧化农用地膜的降解行为。结果表明，在双组分光敏剂的协同作用下，农用地膜的光氧化降解程度显著增加。     

二次氮化法制备γ‘—Fe4N超细粉末

以ＦｅＣｌ２．ｎＨ２Ｏ和ＮＨ３为原料，采用一步气相合成法制备了Ｆｅ／Ｎ超细粉末，并研究了二次氮化法制备化铁超细粉末的工艺技术，通过比较实验，证实二次氮化法能够制备单相的γ－Ｆｅ４Ｎ粉末。利用ＸＲＤ、ＴＥＭ、ＸＰＳ和ＶＳＭ实验手段对Ｆｅ／Ｎ和γ’－Ｆｅ４Ｎ粉末的晶态、物相、形貌、成分、粒度和磁性进行了初步表征。     

环烷酸萃取法从氯化矿泥水浸液中分离稀土元素 2.萃取工艺研究

川西稀土矿泥氯化物水浸液经除杂处理后,用环烷酸萃取。研究了皂化度、平衡水相ｐＨ值、萃取剂浓度等影响因素。用４级逆流串级萃取、２级反萃,可得到纯度９９．８％、含量约５６ｇ·ｄｍ－３的氯化稀土溶液,稀土收率达９６％。整个萃取工艺闭路循环,无废液污染产生。     

Synergistic Extraction of Rare Earth Elements from Phosphoric Acid Medium using a Mixture of Surfactant AOT and DEHCNPB

We describe here the formulation of a new synergistic extractant system for the extraction of rare earth elements from aqueous phosphoric acid solution containing large quantities of impurities currently found in urban mines and secondary deposits. This new synergistic system is original in its concept as it contains the association of the bifunctional extractant amido-phosphonate, known for its high efficiency in the recovery of uranium from phosphate rocks, with the(Bis(2-ethylhexyl) sulfosuccinate sodium) (AOT) surfactant molecule known to form reverse micelles in aliphatic diluents. The mixture was found to extract synergistically rare earth elements with high distribution coefficients (D), and exhibits a high separation factor (S.F.) toward iron (III) from phosphoric acid solution. A complete thermodynamic study of its extraction properties is also presented, showing this system has the ability to extract Rare Earth Elements (REEs) from a wide range of phosphoric acid concentrations, which is often the case in industrial processes.     

Studies on the Solvent Extraction of Rare Earth Metals from Fluorescent Lamp Waste Using Cyanex 923

The growing need for materials such as rare earth metals (REMs) has focused attention towards their recovery from various end-of-life products. Fluorescent lamps are considered a viable target, and can be a source of up to six REMs: lanthanum, cerium, europium, gadolinium, terbium, and yttrium. In this study a commercial mix of trialkylphosphine oxides (Cyanex 923) was investigated for the extraction of REMs from fluorescent lamp waste leachates. The kinetics of the extraction is addressed, together with the co-extraction of undesired elements (iron and mercury), the influence of temperature, nitric acid concentration in the aqueous phase and ligand concentration in the organic phase. The extraction of REMs was found to be enthalpically driven, with good separation factors between the light and heavier elements. Selective stripping of REMs was possible in a single step using 4 M hydrochloric acid solution. Further recovery of iron and mercury was carried out using nitric and oxalic acid solutions.     

液膜对不同酸度磷矿浸出液中稀土的提取

用浓盐酸溶解富含镧、铈等稀土离子的织金磷矿,得到含稀土离子的磷矿浸出液,以P204为载体、Span80或T154作表面活性剂、磺化煤油作溶剂、盐酸作内水相解析剂制成的乳状液膜对酸解液中镧、铈等稀土离子进行提取,考察了流动载体浓度、表面活性剂种类及浓度对稀土提取率的影响及磷矿浸出液中不同浓度稀土离子在不同酸度下的分离提取情况. 结果表明,液膜中最佳载体浓度为12%(j),最佳表面活性剂浓度为4%(j),随外水相pH值增大,液膜对稀土离子的提取率提高,外水相稀土离子浓度为100 mg/L,pH=1时,其提取率可达79.93%.     

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%.     

包钢选矿厂尾矿中稀土与铁共提取

研究了包钢选矿厂尾矿经稀硫酸-稀盐酸溶解、溶解液在乙醇作用下结晶共提取稀土与铁的新工艺. 实验考察了稀硫酸溶解稀土尾矿时,溶解温度、硫酸浓度等对稀土和铁溶解率的影响. 最佳条件下稀硫酸溶解液中稀土溶解率低于8%,铁的溶解率大于94%. Fe3+经工业铁屑还原为Fe2+,在室温下用乙醇提取FeSO4,FeSO4纯度为98.21%,尾矿中铁回收率达89.51%. 稀盐酸不溶物中稀土氧化物(REO)品位为43.60%,稀土回收率达78.82%,新工艺实现了稀土和铁资源的提取分离.     

Solvent extraction of lanthanum and cerium ions from hydrochloric acidic aqueous solutions using partly saponified 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester

In order to clarify the extraction process with saponified extractant, the solvent extraction experiments of rare earth elements(REEs), lanthanum and cerium, by using partly saponified 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester(EHEHPA, HL) from hydrochloric acidic solutions have been performed. The concentration of initial aqueous rare earth ion was in a range of 0.0010–0.1000 mol·L~(-1); EHEHPA in a range of 0.2877–0.8631 mol·L~(-1) with saponification rate of 0.3(mole fraction), and the initial aqueous p H in a range of 1.00–4.00. Firstly, the extracted species were determined by the saturation extraction capacity method. Secondly, according to the equilibrium aqueous pH values, the extraction processes were divided into three different categories: extraction with saponified EHEHPA, extraction with un-saponified EHEHPA, and hydrolysis process. Finally, for the first two processes, in order to predict the distribution ratio, two semi-empirical calculation models were developed with.The calculation results are in good agreement well with the experimental data.     

粉煤灰酸浸溶液中铁铝离子的萃取分离

采用N503和TBP、正辛醇、煤油组成的复合萃取体系,对粉煤灰酸浸溶液中的铝与铁进行萃取分离,考察盐酸浓度、氯离子浓度、萃取剂比例对Fe3+萃取率的影响,以低浓度HCl溶液反萃负载铁有机相,并通过逆流实验确定最佳工艺条件. 结果表明,采用N503:TBP:正辛醇:煤油=3:1:1:5(j)的萃取体系,在初始铁浓度为0.96 mol/L、铝浓度为0.22 mol/L、萃取相比O/A=2:1条件下,经5级逆流萃取,Fe3+的萃取率大于99.8%,铝几乎没有损失. 用0.01 mol/L HCl溶液作反萃剂,反萃相比O/A=2.5:1,经6级逆流反萃,反萃液中铁浓度达1.8 mol/L. 分析了有机相负载铁前后官能团的红外光谱图.     

EXTRACTION OF NIOBIUM AND TANTALUM WITH BIS-2-ETHYLHEXYL ACETAMIDE

ABSTRACT The extraction of Nb and Ta from acid solutions with bis-2-ethylhexyl acetamide and the stripping of these metals with sulphuric acid solutions were investigated. The organic phase was a binary solution of bis-2-ethylhexyl acetamide and xylene, while the aqueous phase was composed of hydrofluoric acid solution or hydrofluoric-sulphuric acid solution containing 3.5-13 Kg/m³ Nb and 5-10 Kg/m³ Ta. Sulphuric acid, hydrofluoric acid and nitric acid were used as salting out agents to understand the effect on the extraction.

Niobium and tantalum were not sufficiently extracted from hydrofluoric acid solutions, whereas the extraction of both metals remarkably increased with an addition of sulphuric acid to the aqueous phase. Both metals were completely co-extracted under the aqueous condition of 6N hydrofluoric acid and 8N sulphuric acid. The stripping occurred for both metals with high efficiency when water or dilute sulphuric acid was used as a stripping agent. The increase in sulphuric acid concentrations caused less stripping of Ta, while the stripping of Nb was maintained at 80% up to 7N sulphuric acid.