99 results about "Neodymium chloride" patented technology

The invention relates to a method for preparing large-particle and flaky praseodymium neodymium oxide, and belongs to a material preparation technology. The method comprises the following steps of: preparing praseodymium neodymium carbonate by using a praseodymium neodymium chloride solution as a raw material and using ammonium hydrogen carbonate as a precipitating agent, washing, filtering, centrifugally drying and firing the praseodymium neodymium carbonate sediment, and thus obtaining the flaky praseodymium neodymium oxide product with the central particle size of 25 to 45 microns. The precipitation temperature and the concentration of the praseodymium neodymium carbonate are the key, the precipitation temperature is controlled to be 60 DEG C, and the concentration of the praseodymium neodymium chloride solution is controlled to be 0.15-0.5mol / L; the large-particle praseodymium neodymium oxide product of which the central particle size is 25 to 45 microns, is produced by using a conventional praseodymium neodymium carbonate precipitating procedure in a factory; and the product is uniform in particle distribution, good in dispersibility and flaky.

The invention discloses a preparation method of absolute neodymium chloride. The method comprises the following steps: S1) performing primary fluidization and dehydration on neodymium chloride hexahydrate at the temperature of 60-100 DEG C to obtain a neodymium chloride monohydrate crude product; and S2) performing secondary fluidization and dehydration on the neodymium chloride monohydrate crudeproduct at the temperature of 140-160 DEG C to obtain absolute neodymium chloride; wherein, the step of secondary fluidization and dehydration is carried out under hydrogen chloride gas atmosphere. According to the preparation method of absolute neodymium chloride, the neodymium chloride hexahydrate is subjected to segment fluidization and dehydration, hydrogen chloride protective gas atmosphere is provided, the hydrolysis of an intermediate product neodymium chloride monohydrate in a dehydration process to absolute neodymium chloride is effectively inhibited, product purity is greatly increased, the dehydration temperature in the preparation method of the absolute neodymium chloride is low, the preparation cost is low, and the dehydration effect is good.

The invention relates to a method for preparing large granular praseodymium neodymium oxide by precipitating ammonium hydrogen carbonate at normal temperature. The method is characterized by comprising the following steps: adding a praseodymium neodymium chloride solution with a concentration of 0.2-0.8 mol / L into a reactor, and directly adding an ammonium hydrogen carbonate solution with a concentration of 1-3 mol / L into the praseodymium neodymium chloride solution at normal temperature, wherein the molar ratio of praseodymium neodymium chloride to ammonium hydrogen carbonate is 1: (3.2-4); adding the ammonium hydrogen carbonate solution in two steps, firstly adding a part of ammonium hydrogen carbonate solution in the first step, stewing and aging for 10-15 hours, adding the rest ammonium hydrogen carbonate solution until complete precipitation, wherein the pH is 6.2-6.5; aging for 10-15 hours at normal temperature, filtering, washing with hot water, and naturally drying to obtain praseodymium neodymium carbonate precipitate with 8 crystal water, roasting the praseodymium neodymium carbonate precipitate to obtain a large granular praseodymium neodymium oxide product with a median particle diameter of 30-40 microns. The method has the advantages that the stepped aging manner is adopted to increase the median particle diameter of the praseodymium neodymium oxide from 1-2 microns to 30-40 microns, so as to greatly improve the granularity of the praseodymium neodymium oxide, and meanwhile, no heating treatment is needed in the precipitating process, so that the production cost is reduced.

A kind of P204 extraction and separation method for preparing 5N neodymium of the present invention, with P204 as extraction agent, neodymium chloride as feed liquid, comprises 7 steps, wherein 3 separation steps and 4 auxiliary steps; 3 separation steps are respectively PrNd / NdSm full-load fractionation extraction and separation section, Pr / Nd quasi-fractionation extraction and separation section, Nd / Sm fractionation extraction and separation section, and four auxiliary process steps are concentration section, acid extraction section, stripping section and rare earth saponification section. Finally, 5N neodymium products, praseodymium-rich products and samarium-rich products are obtained, among which the relative purity of the neodymium product phase is as high as 99.999%-99.9995%, and the yield is as high as 91.64%-94.40%. Compared with the preparation of high-purity neodymium products by non-solvent extraction methods such as resin column chromatography and ion exchange, the present invention has the advantages of high purity of neodymium products, high yield of neodymium products, large production scale, low consumption of chemical reagents, and easy automation , easy to operate, low production cost, conducive to industrial production and other advantages.