Ion type rare-earth ore leaching mother solution impurity-removal system and method

Abstract

The invention discloses an ion type rare-earth ore leaching mother solution impurity-removal system and method. The system comprises a multi-stage series impurity-removal stirring module, an impurity-removal thickener, a multi-stage series precipitating stirring module, a product thickener and a filter press. An impurity-removal product and a precipitation product are treated by a transmission-free deep cone thickening tank with dual overflow weirs, so that the solid-solution separation problem of low-gravity flocky precipitates is solved; a dynamic aging method is adopted for returning the impurity-removal product and the precipitation product into an impurity-removal reaction process and a precipitation reaction process, so that a crystal form is improved, rare-earth loss is reduced and product quality is improved; less efficient flocculating agent with good effect is preferably used to increase settling speed of the impurity-removal product and the precipitation product, so that treatment ability of unit capacity equipment is improved; and functional continuous production equipment is to used to replace an intermittent manual operation facility, so that dust-impurity efficiency and product quality are prevented from being affected by passive errors.

Description

technical field [0001] The invention relates to the technical field of positioning methods, in particular to an ion-type rare earth ore leaching mother liquor impurity removal system and method. Background technique [0002] Since the leaching mother liquor of ionic rare earth ore contains impurity components such as Al, Fe, Mg, Ca and Si, etc., it needs to be separated to obtain qualified rare earth products. At present, the precipitation method and extraction method are mostly studied, and the precipitation method is mostly used in industrial applications. Mainly. [0003] At present, the recovery of rare earth from the leaching mother liquor of ionic rare earth ore is still dominated by precipitation method in industry. The precipitants used mainly include oxalic acid organic precipitant, carbonate inorganic precipitant and magnesium salt inorganic precipitant, etc. There are also researches on humic acid As a precipitant, but no application. In the early days, oxalic a...

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Problems solved by technology

[0006] (1) Impurity removal and precipitation are carried out intermittently in the pool, the standing operation period is long, the processing capacity of the sedimentation tank per unit volume is small, and the mother liquor treatment workshop occupies a large area;

[0007] (2) Both the impurities-removing sediment and the product sediment settle under natural conditions, the sedimentation speed is slow, and the fine-grained crystals settle incompletely, which will easily cause the slag head to be brought into the product to affect the product quality and the product to be brought into the dosing tank to affect the recovery rate ;

[0009] (4) The research on flocculation and sedimentation is not deep. Some ionic rare earth mining enterprises tried to use flocculants to improve the solid-liquid separation effect, but failed to achieve satisfactory results. Negative impact on quality and supernatant return to leaching;

[0010] (5) The aging of the product is carried out under static conditions. Although it is conducive to the growth of crystal reunion and the improvement of filtration performance, the crystal form is poor, and impurities are easily entrained, and the aging time is long and the aging efficiency is low;

[0011] (6) The existing technical solutions are difficult to realize factoryization and automation, and cannot be mass-produced

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