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METHOD OF EXTRACTING RARE-EARTH CONCENTRATE FROM APATITE 发明授权

2023-07-16 3800 268K 0

专利信息

申请日期 2025-08-09 申请号 RU2011105109
公开(公告)号 RU2458863C1 公开(公告)日 2012-08-20
公开国别 RU 申请人省市代码 全国
申请人 Otkrytoe aktsionernoe obshchestvo "Akron"
简介 FIELD : chemistry. SUBSTANCE : invention relates to complex processing of phosphate material, particularly methods of extracting rare-earth elements from apatites. The method involves decomposition of apatite with nitric acid, freezing, separating calcium nitrate tetrahydrate crystals, deposition and separation of fluorine from the nitrate-phosphate solution, neutralisation of the purified solution with ammonia gas in two steps, separating the residue of phosphate concentrate of rare-earth elements and washing with water. Neutralisation of the nitrate-phosphate solution is carried out at temperature 85-95°C to final pH of 1.8-2.2. Before neutralisation, 55-92% ammonium nitrate solution is added in amount of 2-5% of the weight of the solution per 100% ammonium nitrate. Before separation from the suspension, the residue ages in 1-4 hours at temperature 60-80 °C. After separation from the mother solution, the residue is washed with acidified water using a repulping technique. EFFECT : high content of rare-earth elements in the concentrate with high degree of extraction thereof from apatite. 1 tbl, 21 ex


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