METHOD OF EXTRACTING RARE-EARTH ELEMENTS FROM HYDRATE-PHOSPHATE RESIDUES FROM APATITE PROCESSING Russian patent published in 2014 - IPC C01F17/00 C22B3/26 C22B59/00 

Abstract RU 2524966 C2

FIELD: chemistry.

SUBSTANCE: invention relates to a method of extracting rare-earth elements from nitrate-phosphate solutions from apatite processing. The method comprises dissolving apatite in nitric acid, freezing out calcium (strontium) nitrate, precipitating hydrate-phosphates of rare-earth elements and calcium (strontium), dissolving the precipitate in nitric acid, adding calcium (strontium) nitrate obtained from the freezing out step with concentration of 800-1000 g/l and heated to 40-50°C to the solution, wherein content of rare-earth elements (in terms of oxides) is kept at 40-60 g/l, and excess nitric acid 1-2 mol/l, followed by extraction of rare-earth elements with tributyl phosphate in the presence of calcium nitrate, washing and re-extraction, wherein the extract is washed with evaporated re-extraction product to rare-earth element concentration of 250-300 g/l. 70-90% of the obtained solution is removed in form of a finished product and the remaining solution is taken for washing, wherein the raffinate, which contains calcium nitrates and iron and aluminium impurities, is taken for recovering calcium (strontium) nitrate by freezing out or precipitating impurities with calcium oxide.

EFFECT: invention enables to avoid use of concentrated and explosive ammonium nitrate solutions, reduces consumption of nitric acid and improves efficiency of using apatite processing by-products.

2 cl, 6 tbl, 4 ex

Similar patents RU2524966C2

Title Year Author Number
METHOD OF PROCESSING RARE-EARTH ELEMENTS CONCENTRATE 2015
  • Osmak Andrej Valerevich
  • Nikolaeva Irina Ivanovna
  • Gorshkova Nadezhda Vasilevna
RU2595672C1
METHOD FOR APATITE ORE AND CONCENTRATE PROCESSING 2015
  • Bujnovskij Aleksandr Sergeevich
  • Zhiganov Aleksandr Nikolaevich
  • Sachkov Viktor Ivanovich
  • Molokov Petr Borisovich
  • Anufrieva Aleksandra Valerevna
  • Stepanova Oyuna Borisovna
  • Nefedov Roman Andreevich
  • Obkhodskaya Elena Vladimirovna
  • Kosova Natalya Ivanovna
  • Andropov Mikhail Olegovich
  • Sachkova Anna Sergeevna
  • Marakina Elena Ivanovna
RU2614962C1
METHOD FOR EXTRACTION SEPARATION OF RARE-EARTH ELEMENTS 2015
  • Valkov Aleksandr Vasilevich
  • Bujnovskij Aleksandr Sergeevich
  • Rusakov Igor Yurevich
  • Sachkov Viktor Ivanovich
  • Anufrieva Aleksandra Valerevna
RU2596245C1
METHOD OF SEPARATING GADOLINIUM BY EXTRACTION WITH PHOSPHOROORGANIC COMPOUNDS 2012
  • Val'Kov Aleksandr Vasil'Evich
RU2518619C2
METHOD OF SEPARATING TERBIUM AND DYSPROSIUM 2023
  • Valkov Aleksandr Vasilevich
RU2830550C1
METHOD OF PROCESSING PHOSPHOGYPSUM 2012
  • Val'Kov Aleksandr Vasil'Evich
RU2525877C2
METHOD OF RARE-EARTH ELEMENTS EXTRACTION 1997
  • Val'Kov Aleksandr Vasil'Evich
  • Sergievskij Valerij Vladimirovich
RU2118613C1
METHOD OF RECOVERING RARE-EARTH ELEMENTS FROM EUDIALYTE CONCENTRATE SOLUTION SUBJECTED TO HYDROCHLORIC ACID DECOMPOSITION 2005
  • Lebedev Valerij Nikolaevich
RU2288171C1
METHOD OF SEPARATING SAMARIUM, EUROPIUM AND GADOLINIUM 2024
  • Valkov Aleksandr Vasilevich
RU2830549C1
METHOD FOR SOLVENT REFINING OF NITRATE SOLUTIONS CONTAINING RARE-EARTH METALS 2013
  • Anufrieva Aleksandra Valer'Evna
  • Bujnovskij Aleksandr Sergeevich
  • Sofronov Vladimir Leonidovich
  • Rusakov Igor' Jur'Evich
  • Makaseev Jurij Nikolaevich
  • Kruglov Sergej Nikolaevich
  • Rjabov Aleksandr Sergeevich
  • Tinin Vasilij Vladimirovich
RU2517651C1

RU 2 524 966 C2

Authors

Val'Kov Aleksandr Vasil'Evich

Dates

2014-08-10Published

2012-06-05Filed