Gradient leaching technology of weathering crust elution-deposited rare earth ore residual ore leaching agent

Abstract

The invention discloses a gradient leaching technology of a weathering crust elution-deposited rare earth ore residual ore leaching agent and aims at a closed ore field of weathering crust elution-deposited rare earth ore. Water, a low-concentration leaching solution and a high-concentration leaching solution are sequentially injected into the closed ore field of the rare earth ore by utilizing aliquid injection pipe left in the dump leaching or in-situ leaching process for leaching, and the obtained eluent is recycled, so that the problem of regional ammonia nitrogen pollution caused by slowrelease of a residual ammonium salt leaching agent is effectively solved. According to the method, the gradient leaching technology is proposed for the first time, so that the leaching efficiency ofresidual ammonium can be remarkably improved while the usage amount of a metal salt leaching agent is effectively reduced, and the related leaching technology is simple in process, convenient to operate and short in period, has important economic and environmental benefits, and can provide a brand-new thought for efficient and rapid treatment of the residual ammonium salt ore leaching agent in theclosed ore field.

Description

technical field

[0001] The invention belongs to the utilization technical field of mining area pollution control and soil restoration, and in particular relates to a process for comprehensively utilizing high-magnesium phosphorus tailings and phosphogypsum. Background technique

[0002] Weathering crust leaching-type rare earth ores are widely distributed in seven provinces including Jiangxi, Guangdong, Fujian, Hunan, Yunnan, Guangxi and Zhejiang. Because they are rich in medium and heavy rare earths with high commercial value, they are of great economic and strategic value. High attention at home and abroad. Weathering crust leaching type rare earth ores are composed of rare earth-containing granite and volcanic rocks, which are weathered to form kaolinite, halloysite, montmorillonite and illite through biological, chemical and physical actions in a warm and humid climate. At the same time, the easily weathered rare earth minerals in the original rock are weathered and dis...