A Method for Determining the Source and Sink Items of the Ionic Rare Earth Leach Process

Abstract

The invention relates to a method for determining source and sink terms in an ionic rare earth ore leaching process, which is suitable for simulating the ionic rare earth ore leaching process and determining the concentration of an optimal leaching agent. The invention includes four steps: (1) Determine the ion exchange selection coefficient of the rare earth mineral sample; (2) Determine the rare earth grade of the rare earth mineral sample; (3) Establish a source-sink model of the leaching process; (4) Determine the source-sink model Parameters in the term model. Combined with the convection-dispersion equation, the present invention can simulate the ionic rare earth leaching process, determine the concentration of the optimal leaching agent, and provide a basis for determining the concentration of the leaching agent for in-situ leaching. When an ammonium sulfate solution with an optimal concentration of 12.0g / L was used for column leaching testing, the obtained rare earth leaching rate was as high as 96.3%.

Description

technical field [0001] The invention belongs to the field of in-situ ore leaching, and relates to a method for determining source-sink items in the ion-type rare earth leaching process. Background technique [0002] Southern ionic rare earths are rich in medium and heavy rare earth resources, and medium and heavy rare earths play a vital role in the development of high-end technology products. At this stage, ammonium sulfate is mainly used as the leaching agent, and the ionic rare earth ore is mined by the in-situ leaching process. The process of in-situ leaching is to arrange the liquid injection hole network in the mining area according to the hole spacing of 1.0m ~ 2.0m, determine the unit consumption of ammonium sulfate according to the prospecting data, inject a certain concentration of ammonium sulfate solution into the liquid injection hole, and the ammonium in the solution The root ions exchange with the rare earth ions adsorbed on the surface of the rare earth ore ...

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Problems solved by technology

[0003] There are mainly two ways to determine the concentration of ammonium sulfate solution and the amount of ammonium sulfate (see the Chinese patent "Calculation method of leaching agent concentration for ionic rare earth in-situ leaching", application number 201810130892.5), one is based on the experience of previous mining , combined with the prospecting data, determine the concentration of ammonium sulfate solution and the amount of ammonium sulfate. Due to the complexity of geological conditions, the geological conditions of various mines are significantly different. The concentration of ammonium sulfate determined through experience is often not within the reasonable concentration range. If the concentration is too high If the concentration is too high, the ammonia nitrogen in the surrounding water body will exceed the standard, causing environmental pollution. If the concentration is too low, the leaching of rare earths will be insufficient, resulting in waste of resources and increasing the leaching cycle; The results of the test provide a reference for the concentration of the actual mined ammonium sulfate solution and the amount of ammonium sulfate (see the article "Influence of the concentration of the leaching agent on the effect of rare earth leaching" in the journal "Science Technology and Engineering", 2015 No. 28), because The geological conditions of the actual mine are complex and the grade distribution of rare earth is uneven. It is difficult for the indoor column leaching test to simulate the geological conditions and grade distribution of the actual mine more accurately. Guidance on concentration and ammonium sulfate dosage is limited

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