Fractional Precipitation of Rare-Earth Metals and Manganese from Hydrochloric Acid Solutions by Ammonium Carbonate

IF 0.4 Q4 METALLURGY & METALLURGICAL ENGINEERING
D. G. Agafonov, G. B. Sadykhov, T. V. Olyunina
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Abstract

The possibility of using the fractional precipitation of rare-earth metals (REMs) and manganese from hydrochloric acid solutions by ammonium carbonate is considered. Specific features of the behavior of elements during precipitation, which are necessary to know when preparing selective REM and manganese concentrates, have been revealed. At pH 5.25, 85% ΣTR2O3 pass to a deposit (in the oxide formula, ΣTR is the commonly accepted international designation of REMs), and the REM content is 60.5%. At pH 5.25–7.4, 92% manganese are extracted to a manganese concentrate, and the MnO content in the concentrate reaches 70.7%. The complicated chemical composition of the solution requires three-stage fractional precipitation for preparing qualitative selective concentrates: iron and thorium should be precipitated as a cake at the first stage, and REMs and manganese should be precipitated at the second and third stages, respectively. This makes it possible to form deactivated concentrates in the form of carbonates suitable for the further extraction of REMs and manganese by the well-known methods.

Abstract Image

碳酸铵从盐酸溶液中分馏沉淀稀土金属和锰
研究考虑了利用碳酸铵从盐酸溶液中分馏沉淀稀土金属(REM)和锰的可能性。研究揭示了沉淀过程中元素行为的具体特征,这些特征是制备选择性稀土金属和锰浓缩物时必须了解的。在 pH 值为 5.25 时,85% 的 ΣTR2O3 会沉淀下来(在氧化物公式中,ΣTR 是国际公认的 REM 名称),REM 含量为 60.5%。在 pH 值为 5.25-7.4 的条件下,92% 的锰被提取到锰精矿中,精矿中的氧化锰含量达到 70.7%。溶液中复杂的化学成分要求采用三级分馏沉淀法来制备高质量的选择性精矿:铁和钍应在第一级作为滤饼沉淀,REMs 和锰应分别在第二级和第三级沉淀。这样就有可能形成碳酸盐形式的失活精矿,适合于用众所周知的方法进一步提取 REMs 和锰。
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来源期刊
Russian Metallurgy (Metally)
Russian Metallurgy (Metally) METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
0.70
自引率
25.00%
发文量
140
期刊介绍: Russian Metallurgy (Metally)  publishes results of original experimental and theoretical research in the form of reviews and regular articles devoted to topical problems of metallurgy, physical metallurgy, and treatment of ferrous, nonferrous, rare, and other metals and alloys, intermetallic compounds, and metallic composite materials. The journal focuses on physicochemical properties of metallurgical materials (ores, slags, matters, and melts of metals and alloys); physicochemical processes (thermodynamics and kinetics of pyrometallurgical, hydrometallurgical, electrochemical, and other processes); theoretical metallurgy; metal forming; thermoplastic and thermochemical treatment; computation and experimental determination of phase diagrams and thermokinetic diagrams; mechanisms and kinetics of phase transitions in metallic materials; relations between the chemical composition, phase and structural states of materials and their physicochemical and service properties; interaction between metallic materials and external media; and effects of radiation on these materials.
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