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Solvent extraction mechanism and precipitation stripping of bismuth(Ⅲ) in hydrochloric acid medium by tributyl phosphate

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Journal of Central South University 2016年第12期23卷 3085-3091页

作者：王志坚丁风华湛菁张传福 School of Metallurgy and Environment Central South University

Tributyl phosphate(TBP) was employed for the Bi(Ⅲ) extraction from hydrochloric acid *** effects of extraction time and material concentration were *** replacement mechanism between the anion(Cl^-) and TBP was proposed for *** results show the species extracted into the organic phase were found to be mainly BiCl_3·x TBP(x=2 or 3).Thermodynamic parameters of the extraction reaction were obtained from the thermodynamics analysis,which illustrates that higher temperatures show a negative effect on the *** isotherm was obtained with 2.16 mol/L TBP for a typical solution containing 0.1 mol/L of bismuth and 1.0 mol/L of hydrochloric *** 98.5 % of bismuth has been extracted from the leaching solution under the optimum ***,oxalate was explored as a precipitation stripping agent for BiCl_3·x TBP(x=2 or 3) complexes,by which Bi(Ⅲ) was stripped in the form of Bi_2(C_2O_4)_3·7H_2O.A stripping efficiency of 99.3% was obtained in only one stage at the phase ratio of 1 and TBP also could be ***,the method is an efficient,effective and highly selective approach to extract Bi(Ⅲ) and to recover metal bismuth.

关键词： solvent extraction bismuth (Bi) tributyl phosphate (TBP) precipitation stripping extraction mechanism

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Preparation of Sm2O3 and Co3O4 from SmCo magnet swarf by hydrometallurgical processing in chloride media

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Journal of Rare Earths 2018年第7期36卷 725-732页

作者： K.Sahoo A.K.Nayak M.K.Ghosh K.Sarangi CSIR-Institute of Minerals and Materials Technology Bhubaneswar-751013OdishaIndia

The recycling of rare earth elements（REE） from end-of-life REE based products is an environment friendly proposition. Waste Sm-Co based permanent magnet generated during machining is a good source for both Sm and Co. In the present study a simpler process of acid leaching at 80 ℃ followed by solvent extraction, oxalate precipitation and calcination is described for producing pure Sm2 O3 and Co3 O4. With either 10 vol% H2SO4 or 15 vol% HCI at 80 ℃ more than 95% Sm and Co are leached in 1 *** of Sm from sulphate leach liquor with TBP or Aliquat 336 was poor. Although extraction with TOPS-99 is quantitative but Sm from sulphate leach liquor precipitated as Sm2（SO4）3·8 H2O. The chloride leach liquor at an initial pH of 2.5 and with 1.2 mol/L TOPS-99 shows requirement of 4-stages at A：O = 3：2. stripping with oxalic acid precipitates Sm-oxalate which is calcined at 800 ℃ to produce Sm2 O3. Co3 O4 is recovered from the raffinate through oxalate precipitation followed by calcination at450℃.

关键词： SmCo magnet Samarium Cobalt TOPS-99 Solvent extraction precipitation stripping

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A Simple Two-Phase System Involving the Commercial Organophosphorous Extractant Cyanex 471x for the Preparation of Silver Sulphide Nanoparticles

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Materials Sciences and Applications 2012年第12期3卷 843-850页

作者： Rosa Lina Tovar-Tovar Octavio Domínguez-Espinós Adriana Gaona-Couto Azdrubal Lobo-Guerrero Salvador Palomares-Sánchez María Guadalupe Sánchez-Loredo Instituto de Metalurgia San Luis PotosíMéxico Facultad de Ciencias San Luis PotosíMéxico Facultad de Ingeniería Univer-sidad Autónoma de San Luis PotosíSan Luis PotosíMéxico

The facile chemical synthesis of silver sulphide nanocrystals from metal-loaded organic media, containing a silver-selective organophosphorous ligand as extractant, is reported. The method involves the phase-transfer of silver species from aqueous nitrate media to organic solution using the commercial extractant Cyanex? 471x (tri-isobutylphosphine sulphide, Cytec Co.) as extractant, followed by precipitation stripping using ammonium sulphide as strip reagent. The nanoparticles were structurally characterized, and some aspects of the synthetical process, are briefly discussed. Under the conditions studied, the extractant Cyanex? 471x was able to act as stabilizer adsorbing on the particles surface, maintaining the size of the particles nanometrical.

关键词： Silver Sulphide Solvent Extraction precipitation stripping Cyanex 471x Tri-Isobutylphosphine Sulphide

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