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

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.

This invention provides a process for extracting and separating rare earth elements by using non-saponification extractant. The process comprises: utilizing rare earth sulfate solution containing two or more rare earth elements obtained by treating rare earth ore as the raw material, performing Nd/Sm multi-stage fractionation and extraction by using non-saponification extractant P507 to obtain Sm/Eu/Gd enriched product and La/Ce/Pr/Nd extraction raffinate, and further extracting and separating rare earth compounds with non-saponification extractant. The process has such advantages as no emulsification under low-acidity extraction, easy back extraction of medium-molecular-weight rare earth elements, low acid consumption, and high productivity.

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.

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 provides a method for extracting palladium from high-level liquid waste, which belongs to the technical field of radioactive waste after treatment. The high-level liquid waste adopts nitric acid system, and the method comprises the following concrete steps of: a, adequately mixing the high-level liquid waste with extract phase; b, separating extract phase containing palladium from the mixture after extraction equilibrium; c, washing the separated extract phase containing palladium; d, repeating steps b and c 1 to 5 times; e, adding stripping agent to the washed extract phase containing palladium to perform back extraction; and the method is characterized in that triisobutyl phosphine sulfide (TiBPS) is adopted as extracting agent, and thinning agent is added for preparing the extract phase. The method has the following advantages: a, the extracting ratio of palladium in the nitric acid system is high by using TiBPS as extracting agent; b, the concentration range of adaptable nitric acid is wide, Purex process can be directly linked, mixtion is not required in the extraction process, and waste minimization and processing equipment simplification can be realized; c, the selectivity is good; and d, back extraction is easy.

The invention belongs to the field of hydrometallurgy and in particular relates to a method for extracting iron and vanadium from vanadium-titanium magnetite concentrates. The method comprises the following steps of: 1) carrying out acid dissolution and leaching on vanadium-titanium magnetite concentrates and hydrochloric acid; 2) oxidizing Fe<2+> in acid leaching solution obtained in the step 1) into Fe<3+> with an oxidizing agent; 3) extracting iron from the oxidized acid leaching solution obtained in the step 2) with an extracting agent to obtain an organic phase and vanadium-containing raffinate; (4) carrying out back extraction on the organic phase obtained in the step 3) to obtain an extracting agent and an iron-containing acid solution; 5) calcining the iron-containing acid solution obtained in the step 4) to obtain hydrochloric acid and iron trioxide; and 6) treating the vanadium-containing raffinate obtained in the step 3) to obtain ammonium vanadate or vanadium pentoxide. The method has the advantages that the added values of products are high, the recovery rate of vanadium is greatly increased, and the environmental pollution can be avoided.

The invention provides a method for preparing sodium nitrate through solvent extraction. The method includes the following steps that step1, a potassium chloride saturated solution with the temperature of 50 DEG C-70 DEG C is prepared, nitric acid is added to react with the potassium chloride saturated solution at the temperature of 50 DEG C-70 DEG C, cooling crystallization and solid-liquid separation are performed, and an obtained solid phase is washed with water and dried to obtain a potassium nitrate product; step2, an extraction agent is added into a liquid phase obtained in solid-liquid separation in the step1, and a raffinate water phase is returned into a reaction vessel in the step1; 3, an organic phase obtained in extraction in the step2 is mixed with water or a second mother solution, ammonia gas is led into the mixture for reverse extraction, and a reverse extraction organic phase is returned to the step2; 4, condensation crystallization and solid-liquid separation are performed on a reverse extraction water phase in the step3 to obtain ammonium chloride and a first mother solution, potassium chloride is added into the first mother solution and reacts with the first mother solution at the temperature of 60 DEG C-80 DEG C, cooling crystallization and solid-liquid separation are performed to obtain a solid phase and the second mother solution, the obtained solid phase is washed and dried to obtain a potassium nitrate product, and the second mother solution is returned to the step3.

The invention discloses a method for separating uranium and thorium and an extraction agent used for separation. According to the method, uranium and thorium nitrate mixed aqueous solution is placed in imidazolyl ionic liquid diluent in which the reagent is dissolved or n-amyl alcohol diluent in which the reagent is dissolved, thorium is extracted, and uranium stays in an aqueous phase. The extraction agent used for separation is1-methylimidazole showed in a first formula or 2-methylimidazole showed in a second formula. The method and the reagent have the advantages that the extraction agent is cheap and can be obtained easily, an extraction system is simple, extraction efficiency is high, the number of used extraction agents is small, and specificity is strong.

The invention discloses a technique for synthesizing 2-hydroxy-5-tert octyl acetophenone, belonging to the field of organic chemistry synthesis, characterized by using Fries rearrangement reaction of octylphenyl esters to synthesize 2-hydroxy-5-tert octyl acetophenone. The application of oximation products of the synthesized 2-hydroxy-5-tert octyl acetophenone by the technique as a copper extractant can raise the purity of copper and reduce the discharge amount of waste acid in wet copper smelting process. According to the invention, few by-product is produced in the process, there is no need for high temperature vacuum distillation and other purification steps, only acidification, washing and the like are needed, thus by the technique in 2-hydroxy-5-tert octyl acetophenone, the product has high purity and high yield, and the post-treatment is simple.

The invention discloses a preparation method of lutetium nitrate feed liquid. The preparation method comprises the following steps: mixing naphthenic acid, octanol and kerosene to obtain an organic extraction agent; then adding a sodium hydroxide solution into the organic extraction agent, and carrying out saponification reaction to obtain a saponified organic extraction agent; then carrying out rare earth saponification in a cascade reaction mode, and mixing and reacting the obtained saponification organic extraction agent and lutetium chloride feed liquid and then standing for phase splitting; then adopting a multi-stage washing mode, taking an organic phase obtained in the last-stage extraction section to be mixed with a water phase or nitric acid in a next-stage washing section for reaction, and then standing for phase splitting; and mixing the organic phase obtained in the last-stage washing section with the water phase or nitric acid in the next-stage back extraction section in amulti-stage back extraction mode, reacting, standing, and carrying out phase splitting to obtain a water phase, namely lutetium nitrate feed liquid, in the last-stage back extraction section. The method effectively solves the problems that the existing lutetium nitrate feed liquid production process is complicated, and the content of chloride ions and sodium ions in the obtained lutetium nitratefeed liquid is high.

The invention provides a preparation method of high-purity thorium nitrate. The preparation method comprises the steps that HNO3 and NaNO3 are used as salting-out agents for allocating a Th(NO3)4 solution to form a mixed solution, and a P350-sulfonated kerosene organic phase is used for extracting the mixed solution; a NaNO3 solution is adopted for washing the obtained organic phase loaded with Th; and a fluorine-containing water solution is adopted for reversely extracting the washed organic phase loaded with Th. The process has the advantages that when high-purity water is adopted for thorium reverse extraction, F<-> in an added HF or NaF solution can be easily coordinated with Th<4+> to form [ThFx]<4>-x, so that reverse extraction of a P350 system with Th<4+> loaded is promoted, and the reverse extraction rate of thorium can be improved; and the product quality can reach the standards that ThO2/Th(NO3)4.6H2O is larger than or equal to 46%, and the ThO2 purity is larger than 99.9995%.

The invention relates to a composite extractant used in a metal indium extraction process. The composite extractant is formed by mixing Bis(2-ethylhexyl)phosphate (P204), trioctylphosphine oxide and hexylphosphine oxide mixture liquid (C923) and trialkyphosphine oxides (TRPO) according to certain proportion. After being diluted with sulfonated kerosene, the composite extractant is used as an extractant used for metal indium extraction. The composite extractant has good chemical stability, good selectivity and high indium extraction efficiency which can achieve more than 90%, simultaneously canreduce the extractant emulsification, is easy for re-extraction, and the demand to extraction conditions of a system is not high.

The invention provides an extractant composition. The extractant composition comprises the following components in percentage by mass: 20-40% of a phosphate extractant as shown in a formula 1, 35-50%of C6-C10 monohydric alcohol and the balance of a diluent. The invention further provides a resource utilization method of the iron-containing wastewater, and the extractant composition is used in theresource utilization method. The extractant composition disclosed by the invention does not need to use an organic amine extractant, is simple in extraction system and relatively low in cost, and does not easily generate a third phase even under high-concentration iron, so that the extractant composition can be suitable for extraction treatment of various iron-containing wastewater. The resourceutilization method provided by the invention can effectively extract and separate iron from the iron-containing wastewater for resource utilization, is very suitable for large-scale application, and has important economic and social values;.

The invention discloses a method for separation of thorium elements from rare earth elements and an extraction agent used in the method. According to the method, a mixed aqueous solution of thorium and rare earth nitrate is subjected to extraction through an n-amyl alcohol diluent, wherein the extraction agent is dissolved in the n-amyl alcohol diluent; the thorium elements are extracted, and the rare earth elements are lest in an aqueous phase. The extraction agent used in the method is 1- methylimidazole as shown in formula 1. The method for separation of the thorium elements from the rare earth elements and the extraction agent used in the method have the advantages that the extraction agent is low in price and easy to obtain, an extraction system is relatively simple, extraction efficiency is quite high, the quantity of the used extraction agent is quite small, and the specificity is strong.

The invention discloses a pyrazine compound and application thereof. In particular, the present invention provides a compound represented by the formula (I), wherein the extractant composed of the compound has a high extraction rate for lithium ions, and the organic phase is easy to enrich lithium-7 isotopes, so as to realize the extraction and separation of lithium isotopes.