"Gene" Information Of Ionic Rare Earth Deposits And Its Determination Method

Ion-adsorbed rare earth deposits are a unique and invaluable mineral resource.However,in the current ion-adsorption rare earth in-situ leaching process,due to insufficient geological exploration data of the deposit,the rare earth reserves are inaccurate,resulting in excessive leaching agent dosage,low resource recovery rate,environmental pollution and landslide.To this end,this paper defines the basic characteristics of mineral deposit formation history and rare earth leaching performance as the "gene" information of ion-adsorbed rare earth deposits,and determines their determination methods.Through these genetic information,it is possible to discuss and formulate scientific and rational development plans for ion-adsorbed rare earths,improve rare earth extraction efficiency and reduce environmental impact.Taking a weathered crust leaching type rare earth deposit in Guanxi Town,Longnan County,Ganzhou City,Jiangxi Province as the research object,through sampling and chemical and instrumental analysis methods,various types of information of ore samples taken from different spatial locations in the ore were determined.Abrasion pH,exchange pH,leaching pH,particle size distribution,water content,zeta potential,permeability,content of each rare earth element,and total amount of rare earth.The results show that the minerals in the deposit have higher abrasion pH,and the distribution of rare earth content and distribution in the vertical direction is not uniform.The abrasive pH,exchange pH,leaching pH,rare earth content and spatial distribution of rare earth elements are combined with the ore sample.The genetic information attributes of the above indicators and their application value in mineralization mechanism,leaching agent selection and method optimization,leaching method and condition optimization were discussed,and the corresponding determination methods were improved.The ICP-MS measurement of the rare earth leaching solution in the ionic rare earth deposit shows that the aluminum ion content in the leaching solution is high,and the exchange pH and leaching pH are low.The variation of rare earth content and distribution with depth is different from that of other reported ion-adsorbed rare earths.The rare earth is mainly concentrated in the upper part,and the heavy rare earth component does not increase with increasing depth.This special variation is directly related to its high aluminum content and low exchange leaching pH.Different from the migration and enrichment of rare earth ions on the surface of ordinary clay minerals,the presence of a large amount of aluminum and high abrasion pH lead to a decrease in the migration ability of rare earths,especially the migration of heavy rare earth elements with greater hydrolysis ability,and is bound by hydroxyaluminum colloidal particles.It stays in the upper part of the mine.For such rare earth ore samples with high aluminum content,high abrasion pH and low exchange leaching pH,a large amount of aluminum ions exist in the leaching solution,and the rare earth leaching rate is also high.It is difficult to meet the production requirements with traditional ammonium sulphate leaching and ammonium bicarbonate precipitation,but it is possible to suppress the leaching of aluminum by adding a small amount of ammonium citrate or hexamethylenetetramine to the ammonium sulphate leaching agent.The pH of the leachate reduces the aluminum ion content of the leachate,but reduces the yield of rare earth.To ensure the rare earth yield,a weak acid leaching plus extraction separation method can be used to produce low aluminum rare earth products.