Intensive large-scale ion-type rare earth ore leaching mother liquor continuous treatment system and method

Abstract

The invention relates to an intensive large-scale ionic rare earth ore leaching mother liquor continuous processing system and method. The system includes an ammonium bicarbonate supply module, a flocculant supply module, a multi-stage series-connected impurity removal / precipitation stirring module, and an impurity removal / product thickener. , leaching agent preparation module, etc. Automatic operation, automatic adjustment and control of process parameters, and more accurate control; good impurity removal effect, better and more stable product quality, saving reagents and reducing production costs; highly intensive equipment and facilities, and a water metallurgy workshop with the same production capacity covers an area Compared with the existing technology, it is greatly reduced; large-scale production is realized, and the hydrometallurgical workshop with the same floor area, with highly integrated equipment and facilities, can obtain mother liquor processing capacity and product output production capacity far greater than the existing technology. Connect the in-situ leaching mine with the mother liquor treatment workshop, rationally plan the mining area, realize the orderly mining of the mine, rationally utilize the process solution, and regulate the water balance, which is conducive to the environmental protection management of the mine and realizes a green mine.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to an intensive large-scale ion-type rare earth ore leaching mother liquor continuous treatment system and method. Background technique [0002] At present, the ammonium bicarbonate precipitation method is mostly used for the removal of impurities and precipitation in the leaching mother liquor of ionic rare earth ores, or oxalic acid was used as a precipitant in the early stage of mixing, but it has not been gradually eliminated. In the process of carbonate impurity removal, the primary factor that determines the effect of impurity removal is the pH control of the end point of impurity removal. Since the impurity components of the leachate are mainly Al, Fe, Mg, Ca, Si, etc., the hydrogen generated during the impurity removal process The oxide precipitates are mostly flocs, which are suspended due to their light weight, slow settling speed, and long clarification time, whic...

AI Technical Summary

Problems solved by technology

In the process of carbonate impurity removal, the primary factor that determines the effect of impurity removal is the pH control of the end point of impurity removal. Since the impurity components of the leachate are mainly Al, Fe, Mg, Ca, Si, etc., the hydrogen generated during the impurity removal process The oxide precipitates are mostly flocs, which are suspended due to their light weight, slow settling speed, and long clarification time, which brings difficulties to solid-liquid separation, and the fine precipitates (slag heads) are easily carried into the product by the supernatant Precipitation process, affecting product quality

Precipitation also needs to control the pH of the end point, and the rare earth carbonate product obtained by rare earth product precipitation is also a floc, which is difficult to separate from solid and liquid, and because the fine product precipitate is easily taken away by the supernatant, it enters the leaching solution preparation system to reduce the rare earth Recovery rate

[0003] Intermittent manual operations are mostly used in the ionic rare earth leaching mother liquor removal and product precipitation process. The main problems are: (1) a large number of impurity removal tanks, sedimentation tanks, and aging tanks are required; (2) the operation is complicated, and the supernatant is judged by human eyes. , parameter control is unstable; (3) The operation cycle is long, and a single operation of impurity removal and precipitation takes 12h

[0011] (1) The configuration of equipment and facilities is too simple, the operation is extensive, and the control of process parameters is random, which inevitably leads to excessive consumption of reagents, low efficiency of impurity removal and poor product quality;

[0012] (2) The slag head and products are all flocculent sediments with slow settling speed. The visual error of the clarity of the supernatant and the control of the discharge of the supernatant vary from person to person, which may easily lead to incomplete removal of impurities and low recovery;

[0013] (3) Impurity removal and sedimentation are all carried out in the pool, and air stirring is used, and the working environment of workers is poor;

[0014] (4) The solid-liquid separation cycle is long, the processing capacity of the pool per unit volume is small, many pools are required, and the floor area is large;

[0015] (5) The impurity removal and precipitation are all manually operated, which cannot realize factory operation and is difficult to realize automatic operation

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