Method of producing metal technetium
(57) Abstract:The invention relates to a method for production of metallic technetium from industrial concentrates pertechnitat potassium, including the dissolution of hanging pertechnitat potassium in water, ion exchange cleaning solution on the cation exchanger in the hydrogen form with obtaining a filtrate-technecally acid neutralization technecally acid ammonia solution, evaporation of the solution, deposition pertechnitat ammonium and restore it to the metal. When this process is carried out cyclically and each second hinge pertechnitat potassium dissolved in the filtrate - technecally acid from the previous cycle. table 1. The invention relates to chemical technology and can be used to obtain pure metallic technetium-99 from industrial concentrates pertechnitat potassium.A method of obtaining metallic technetium by direct reduction pertechnitat potassium hydrogen flow .However, to obtain pure metallic technetium it's not good, because almost no clearance from potassium, TRANS-uranium elements, ruthenium.Closest to the present invention is a method of obtaining met the thief on the cation exchanger in the hydrogen form, the neutralization of the filtrate - technecally acid ammonia solution, evaporation of the solution, deposition pertechnitat ammonium and restore salt to metal. The method allows deep cleansing of potassium, ruthenium, alpha-emitters. The disadvantage of this method is the duration of the process, and the limiting stage is evaporation of the filtrate, and the volume parivesh solutions is determined by the solubility pertechnitat potassium in the water, reaching at 20oC of 9.51 g/l for technetium.The aim of the invention is the reduction of time of the process by reducing the volume parivesh solutions.The aim is achieved in that each second hinge pertechnitat potassium dissolved in the filtrate from the previous cycle-technecally acid.Comparative analysis of the prototype allows us to conclude that the portion of the source pertechnitat potassium dissolved in the filtrate previous cycles. Thus, the claimed method meets the criteria of the invention of "novelty."At the same time, the fact that education for sustainable over the technetium solution in the dissolution pertechnitat potassium technecally acid and arising in connection with this possibility is asego time is not described in the scientific literature. Thus, the claimed technical solution meets the criterion of "inventive step".The technology of the method is as follows.A portion pertechnitat potassium dissolved in water so as to obtain a practically saturated solution. The maximum possible content of technetium at 20oC in a solution of 9.51 g/l Solution is passed through a cation exchanger in hydrogen form, receiving the filtrate tehnicianul acid, with the same content of technetium (9,51 g/l). The column is washed with water, washing, containing the remains of technetium, collect. The second hinge pertechnitat potassium dissolved in the resulting technecally acid, arriving at 20oC concentration of 20.9 g/l for technetium. Even more to increase the concentration of ceteris paribus is not possible. The solution is again passed through pre-regenerated cation exchange resin. The filtrate is neutralized with a concentrated solution of ammonia, evaporated, highlighting pertechnetate ammonium, and restore the latter to the metal. Column after purification of the concentrated solution of technetium washed collected promodj from the first cycle, and then dissolved in the last third portion pertechnitat potassium to obtain a saturated solution. Then all processes are time dependence of the evaporation of the leachate from the mass of processed concentrate (see table).Thus, each second hinge pertechnitat potassium dissolved in technecally acid, which is the filtrate from the previous cycle. And if the prototype on evaporation and precipitation were sent the filtrate after each cycle of the ion-exchange treatment, the inventive method after each second. The volume of solutions to be oparka, reduced by more than half, resulting in reduced and time of the process. Method of producing metal technetium from industrial concentrates pertechnitat potassium, including the dissolution of hanging pertechnitat potassium in water, ion exchange cleaning solution on the cation exchanger in the hydrogen form with obtaining filtrate technecally acid neutralization technecally acid ammonia solution, evaporation of the solution, deposition pertechnitat ammonium and restore it to the metal, wherein the process is conducted in cycles in each second cycle, a portion pertechnitat potassium dissolved in the filtrate
technecally acid from the previous cycle.
FIELD: processes for making powders of molybdenum, tungsten and rhenium by reduction of ammonium salts for further using them for producing hexafluorides of respective metals and in gas-fluoride technique.
SUBSTANCE: method is realized by reducing ammonium salts of refractory metals by hydrogen. Method comprises steps of reducing ammonium salts at temperature 350 - 550 C while using hydrogen of hydrogen-containing gas generated in cathode space of electrolyzer for producing fluorine and containing, vol. %: hydrogen, 92 - 94; hydrogen fluoride 5 - 6; inert impurities, the balance.
EFFECT: simplified lowered-cost manufacturing process.
1 dwg, 1 tbl, 3 ex