| 简介 |
1. method of isolating rare-earth elements from grinding waste from production of permanent magnets, which includes dissolving grinding waste in sulfuric acid, isolation of double salts of rare-earth of Na, conversion of double salts in hydro ksidy rare-earth elements, dissolving hydro ksidov rare-earth elements in nitric acid, extraction separation by line of Nd-of Sm, production of carbonates middle and heavy group rare-earth elements, extraction separation by line of Nd-of PR, oxalate neodymium, production of ultra-pure neodymium oxide, fluoride preparation neodymium by solid phase fluorination, the metal neodymium by electrolysis fluoride - oxide melt, as well as purification of iron by liquid extraction careers, oxalate iron and production of highly pure iron oxide. of 2. Method according to Claim 1, characterized in that double sulfates RZ Na converted in hydro ksidy rare-earth elements and then is dissolved in nitric acid. 3 of. Method according to Claim 1, characterized in that is not carried out removal of lightly double sulfates RZ Na and hydro ksidov rare-earth elements. 4 of. Method according to Claim 1. differs, obtained that hydro ksidy rare-earth elements are dissolved in nitric acid and are directed to extraction separation. of 5. Method according to Claim 1, characterized in that processing of mother liquors deposition of double sulfates RZ Na is carried out by precipitation iron - cobalt cake followed by dissolving its in hydrochloric acid and extraction cleaning iron. 6 of. Method according to Claim 1, characterized in that shlifotkhody at dissolving not pass heat treatment. 7 of. Method according to Claim 1, characterized in that in extraction separation of rare-earth elements is carried out first division along line of Nd-of Sm, and then along line of Nd-of PR, the source solution for the second stage of separation is |
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