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Neutralization-flocculation method for removing impurity aluminum in rare earth solution

A rare earth solution and flocculation technology, applied in the direction of improving process efficiency, can solve the problems of large area, high production cost per unit of material, discontinuity, etc., and achieve the effect of small investment, large processing capacity and simple process.

Inactive Publication Date: 2014-10-01
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, many enterprises use the method of multiple pressure filtration + multi-stage precipitation to reduce the aluminum content in the feed liquid from 6g / L to 1g / L, but the operation of multiple pressure filtration + multi-stage precipitation not only occupies a large area and is intermittent The production cost of operation and unit material is high, and more importantly, the aluminum content in the rare earth liquid has not yet reached below 0.5g / L

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Concentrated hydrochloric acid is used to dissolve the rare earth concentrate, the pH value of the dissolved rare earth solution is adjusted to 4.0, the temperature is 95°C, hydrogen peroxide is added to oxidize, and then concentrated by a high-efficiency thickener, the concentrated solid is returned to the acid-dissolving operation; the concentrated solution is adjusted by adding NaOH The pH value is 5.30, the temperature is 35°C, and the pH value is adjusted to 5.43 by adding ammonia water, using a mixing bucket at 800 rpm, and adding a coagulant aid (poly iron, the dosage is 0.08kg / m 3 Feed liquid) for 5 minutes, using a 200 rpm mixing tank, adding flocculant (cationic polyacrylamide, cationic degree 50~60, molecular weight 300~8 million, dosage 0.08kg / m 3 material liquid) for 5 minutes, then stirred with a mixing bucket at 200 rpm for 3 minutes, stood still for 24 hours, and used the supernatant directly; the sediment was vacuum filtered, and the filter residue was s...

Embodiment 2

[0013] Concentrated hydrochloric acid is used to dissolve the rare earth concentrate, the pH value of the dissolved rare earth solution is adjusted to 3.5, the temperature is 60°C, hydrogen peroxide is added to oxidize, and then concentrated by a high-efficiency thickener, the concentrated solid is returned to the acid-dissolving operation; the concentrated solution is adjusted by adding NaOH The pH value is 5.20, the temperature is 15°C, and the pH value is adjusted to 5.43 by adding ammonia water, using a mixing bucket at 400 rpm, and adding a coagulant aid (poly iron, the dosage is 0.02kg / m 3 Feed liquid) for 2 minutes, using a mixing tank of 80 rpm, adding flocculant (cationic polyacrylamide, cationic degree 50~60, molecular weight 300~8 million, dosage 0.01kg / m 3 material liquid) for 1 min, then use a mixing tank with a rotating speed of 80 rpm to stir for 1 min, stand still for 10 h, and use the supernatant directly; the sediment is vacuum filtered, and the filter residue...

Embodiment 3

[0016] Concentrated hydrochloric acid is used to dissolve the rare earth concentrate, the pH value of the dissolved rare earth solution is adjusted to 3.65, the temperature is 80°C, hydrogen peroxide is added to oxidize, and then concentrated by a high-efficiency thickener, the concentrated solid is returned to the acid-dissolving operation; the concentrated solution is adjusted by adding NaOH The pH value is 5.27, the temperature is 25°C, the pH value is adjusted by adding ammonia water to 5.43, the stirring tank is used at 600 rpm, and the coagulation aid (poly iron, the dosage is 0.04kg / m 3 Feed liquid) for 3 minutes, using a mixing tank at 120 rpm, adding flocculant (cationic polyacrylamide, cationic degree 50-60, molecular weight 3-8 million, dosage 0.02kg / m 3 material liquid) for 3 minutes, and then stirred for 2 minutes with a mixing tank with a rotation speed of 120 rpm, and stood still for 14 hours, and the supernatant was used directly; the sediment was vacuum filtere...

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PUM

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Abstract

The invention discloses a method for removing impurity aluminum in a rare earth solution by a neutralization-flocculation method, which comprises the following steps: acid dissolution, oxidation, concentration, neutralization, flocculation, static sedimentation, vacuum filtration and washing. The invention can reduce the concentration of aluminum ions in the rare earth acid solution from >1g / L to 200mg / L at one time; the investment is small, the process is simple, the processing capacity is large, and the problems of leakage and permeation caused by the hydrolysis method are avoided. Applied to rare earth concentrates with high aluminum content, it can simultaneously solve the two major problems of difficult solid-liquid separation of feed and liquid and excessive aluminum.

Description

technical field [0001] The invention belongs to the field of separation and purification of rare earth metals, and in particular relates to a method for removing impurity aluminum in a rare earth solution by using a neutralization-flocculation method. Background technique [0002] At present, the "acid dissolution-precipitation" process is generally used to treat rare earth concentrates before the separation and purification of rare earth metals. The impurity aluminum in the rare earth concentrates enters the rare earth acid solution and becomes the main source of aluminum in the rare earth metals. Rare earth concentrates with high aluminum content will inevitably cause the concentration of aluminum ions in the acid solution solution to be too high, which will affect the rare earth separation operation and even the quality of the final rare earth product. Therefore, to obtain qualified rare earth products, the problem of high aluminum content in rare earth concentrates shoul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/44C22B59/00
CPCY02P10/20
Inventor 库建刚
Owner FUZHOU UNIV