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摘要
The ion-adsorption type rare earths ore contains natural U, Th-232 and Ra-226. The production of this kind of rare earth concentrate will produce a lot of waste residue and wastewater. It may cause the radioactive pollution and the wastage of radioactive resources. In this paper, a quantitative analysis on the migration and enrichment of natural radionuclides in the extraction process of the ion-adsorption type rare earths ore was developed. The column leaching, impurity removal, precipitation and roasting process were carried out according to the actual extraction process conditions. The related results about RE and Al did accord with the actual production index. For natural radionuclides, most of the radionuclides in the raw ore were retained in the tailings, and only 3.31% natural U, 0.08% Th-232 and 0.62% Ra-226 migrated into leaching liquor because the partial release of the exchangeable phase and carbonates phase. The radionuclides in the leaching liquor were finally distributed in the impurity slay (about 0.30% natural U, 0.057% Th-232 and 0.016% Ra-226), the precipitated liquor (about 1.89% natural U, 0.012% Th-232 and 0.59% Ra-226) and the rare earth concertrate (about 1.03% natural U, 0.009% Th-232 and 0.019% Ra-226). Moreover, the radionuclides contents in impurities slag and rare earth concentrate were greatly improved than it in the raw ore, being 79.18 mgkg(-1) natural U, 122.59 mgkg(-1) Th-232, 1.83 x 10(-6) mgkg(-1 226)Ra in impurities slag and 284.07 mgkg(-1) natural U, 19.95 mgkg(-1) Th-232, 2.31 x 10(-6) mgkg(-1) Ra-226 in rare earth concentrate. These part of the radionuclides might could be further enriched by optimum solubilizing, and then recycled by extraction in an economic way. What's more, the radioactive specific activities in the different types of samples were much lower than the specific activities threshold of radioactive waste, and would have little harm to the human body. The research of the migration and enrichment of natural radionuclides in the extraction process had provided accurate and reliable data support for the radioactive pollution prevention and the recovery of radionuclides.
- 出版日期2017-8
- 单位江西理工大学
