42results about How to "Stripping is easy" patented technology

The invention relates to a technology for separating rare earth element by extraction system added with modifier, which comprises using potassium dihydrogen phosphate and its sulfo-derivative as the extractant, wherein the potassium dihydrogen phosphate or its sulfo-derivative is bis-(2-ethylhexyl)phosphate (P204), 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (P507), bis(2, 4, 4-trimethylpentyl)phosphinic acid (Cyanex272), bis(2, 4, 4-trimethylpentyl) dithiophosphinic acid (cyanex301), bis(2, 4, 4-trimethylpentyl) monothiophosphinic acid (Cyanex302), using ROH as addition agent, R is C4-C10 alkyl, using alkane or aromatic hydrocarbon as thinning agent, forming 1.0-1.5M potassium dihydrogen phosphate - 5-30% ROH - alkane or aromatic hydrocarbon extraction architecture, using chlorinated or nitrated rare earth solution as feed liquid, using hydrochloric acid or nitric acid as inverse acid, determining single rare earth in raffinate or strip liquor through EDTA titration, and determining mixed rare earth through plasma atom emission spectrometric method.

The invention provides a process method for separating and purifying rare earth elements by solvent extraction. The method takes a mixed rare earth sulfate solution obtained from a rare earth ore treated by sulphuric acid as a raw material, directly adopts a nonsaponifiable P507 extraction agent or a synergistic extraction agent containing the P507 to completely extract rare earth in a material liquid into an organic phase, and then takes the organic phase as a rare earth material liquid to extract, separate and purify the rare earth or directly backextract to produce mixed chlorinated rare earth or rare earth nitrate. The process method is simple and flexible, does not saponify the organic phase during the extraction and separation process, does not produce ammonia nitrogen waste water, is easy to backextract middle and heavy rare earths, and has less consumption of acid and base and low production cost.

The invention relates to a technological method for extracting and separating quadrivalent cerium, thorium, and less-cerium trivalent rare-earth from rare earth sulfate solution. The rare earth sulfate solution, which is obtained through processing the rare-earth ores and contains the thorium and high-valence cerium, is used as raw material; synergistic extraction agent basing on P507 and P204 is adopted for extracting and separating; the cerium (4) and the thorium are extracted into an organic phase, then selective washing and back extraction are performed step by step to obtain the products including pure cerium and pure thorium, the trivalent rare-earth is left in a water phase, and then unsaponifiable P507 or the synergistic extraction agent basing on P507 is adopted to perform multistage fractional extraction to separate single rare earth elements after impurity removal. The technological methodn has the characteristics that the synergistic extraction agent basing on P507 and P204 is adopted, the thorium is easy to perform the back extraction, and extraction capacity is large, and the emulsification is not generated during the extraction process; the cerium (4), the thorium and trivalent rare-earth are extracted and separated in the same extraction system; both extraction and the separation adopt unsaponifiable extraction agent, and ammonia-nitrogen wastewater is not generated; in addition, the thorium is recovered as products, and the pollutions caused by thorium-containing waste residue and the ammonia-nitrogen containing wastewater are eliminated from headstream. Therefore, the technological method has the advantages of simple procedures, green environmental protection, and low manufacturing cost.

The invention discloses a heavy rare earth and light rare earth separation method and a heavy rare earth and light rare earth separation extraction agent. The method includes the step of conducting extraction on a rare earth element and nitrate mixed aqueous solution through imidazolyl ionic liquid where the extraction agent is dissolved or chloroform where the extraction agent is dissolved or a 1-pentanol diluent where the extraction agent is dissolved so that heavy rare earth elements can be extracted and yttrium and light rare earth elements can be kept in the aqueous phase, wherein the extraction agent which is used is 1-methylimidazole shown in the chemical formula 1 or 2-methylimidazole shown in the chemical formula 2 when the diluent is the imidazolyl ionic liquid or the chloroform, and the extraction agent which is used is 2-methylimidazole shown in the chemical formula 2 when the diluent is the 1-pentanol diluent. The heavy rare earth and light rare earth separation method and the heavy rare earth and light rare earth separation extraction agent have the advantages that the extraction agent is low in price and can be easily obtained, the extraction system is simple, the extraction efficiency is high, the amount of the extraction agent which is used is small, and the specificity is strong.

The extraction and separation method for rare-earth element comprises: with rare-earth solution contained a plurality of rare-earth elements as material, preparing mixed extractant with the non-saponifiable P204 and one or two from P507, P229, P350, TBP, C272, C301, C302 and HEOPPA; in the mixed solution with rare-earth sulfate solution, or rare-earth sulfate and rare-earth chloride solution and rare-earth nitrate solution, extracting and separating rare-earth elements. This invention eliminates saponification to overcome pollution, reduces acidity to improve rare-earth concentration, and decreases the main material consumption more than 30% compared with the technique with NH4HCO3 and P507.