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Method for preparing iron oxide yellow from rare earth waste acid leaching residues

A technology of waste acid and iron yellow, applied in the directions of ferrous oxide, ferric oxide/ferric hydroxide, etc., can solve the problems of storage pollution, occupied space for stacking, large amount of acid leaching waste residue, etc., and achieves simple process and low production cost. , the effect of stable quality

Pending Publication Date: 2021-07-13
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And if the acid leaching residue is not further treated, it contains a small amount of sulfuric acid, which is extremely corrosive and oxidizing, causing pollution to the environment
And due to the large amount of acid leaching waste residue, stacking takes up space and pollutes the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing iron yellow from rare earth waste acid leaching slag, comprising the steps of:

[0029] (1) Take 7.5 g of rare earth waste acid leaching residue, add 30 mL of sulfuric acid solution with a concentration of 11.0 mol / L, react for 40 min at a temperature of 95 ° C, and stir at a speed of 40 r / min, filter, and wash (wash with distilled water). At this time, the dissolution rate of the acid leaching waste residue was 68.7%, the total volume of the filtrate was 500 mL, and the total iron content in the filtrate was measured to be 6.91 g / L.

[0030] (2) Add excess iron filings to the filtrate obtained in the previous step, keep the temperature at 80° C. for 24 hours, and then filter to obtain ferrous sulfate solution. The filter residue is excess iron filings and can be reused.

[0031] (3) with the ferrous sulfate solution obtained in the previous step, the pH of the solution is adjusted to be 4.0 with saturated sodium carbonate solution, and flocculen...

Embodiment 2

[0034] A method for preparing iron yellow from rare earth waste acid leaching slag, comprising the steps of:

[0035] (1) Take 10.0 g of rare earth waste acid leaching residue, add 50 mL of sulfuric acid solution with a concentration of 8.0 mol / L, react for 60 min at a temperature of 80 ° C, and stir at a speed of 40 r / min, filter and wash (wash with distilled water). At this time, the dissolution rate of the acid leaching waste residue was 72.6%, the total volume was 500 mL, and the total iron content in the filtrate was measured to be 9.72 g / L.

[0036] (2) Add excess iron filings to the filtrate obtained in the previous step, keep the temperature at 80° C. for 24 hours, and then filter to obtain ferrous sulfate solution. The filter residue is excess iron filings and can be reused.

[0037] (3) Regulating the pH of ferrous sulfate solution with saturated potassium carbonate solution is 4.0, and flocculent precipitation occurs, which is aluminum and other impurities, and is ...

Embodiment 3

[0040] A method for preparing iron yellow from rare earth waste acid leaching slag, comprising the steps of:

[0041] (1) Take 20.0 g of acid leaching waste residue, add 120 mL of 6.0 mol / L sulfuric acid solution, react for 90 min at a temperature of 80 ° C, and stir at a speed of 40 r / min, filter and wash (wash with distilled water). So repeated leaching 2 times with sulfuric acid solution, the dissolution rate of the acid leaching waste residue was 80.2%, the total volume was 1000mL, and the total iron content in the filtrate was 10.7g / L.

[0042] (2) Add excess iron filings to the filtrate obtained in the previous step, keep the temperature at 80° C. for 24 hours, and then filter to obtain ferrous sulfate solution. The filter residue is excess iron filings and can be reused.

[0043] (3) the ferrous sulfate solution obtained in the previous step is adjusted to a pH of 4.0 with a saturated sodium bicarbonate solution, and flocculent precipitation occurs, which is aluminum a...

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Abstract

The invention provides a method for preparing iron oxide yellow from rare earth waste acid leaching residues. The method comprises the following steps: (1) adding a sulfuric acid solution into the rare earth waste acid leaching residues, leaching and filtering to obtain a leachate; (2) adding a reducing agent into the leachate to obtain a ferrous sulfate solution; (3) adjusting the pH value of the ferrous sulfate solution in the step (2) to 3-4 by using a carbonate solution, removing impurities, and filtering to obtain a pure ferrous sulfate solution; and (4) introducing oxygen into the pure ferrous sulfate solution obtained in the step (3). The innovation point of the method is that sulfuric acid generated in the reaction can be consumed by scrap iron, so that sulfuric acid is not wasted, and new ferrous sulfate can be formed. The method is a low-cost, green and sustainable method.

Description

technical field [0001] The invention relates to the technical field of resource utilization of solid waste, in particular to a method for preparing iron yellow from acid leaching slag of rare earth waste. Background technique [0002] Rare earth waste acid leaching slag is the waste slag produced after acid leaching and rare earth extraction from NdFeB waste, mainly containing iron and other small amounts of metal elements. And if the acid leaching residue is not further treated, it will contain a small amount of sulfuric acid, which is extremely corrosive and oxidizing, causing pollution to the environment. And because the amount of acid leaching waste residue is large, it takes up space for stacking and pollutes the environment. Although it can be used as a raw material for ironmaking, the content of valuable metals in the acid leaching waste residue is still very high, especially the content of iron is very high, and the price is quite cheap. So it has a very good recyc...

Claims

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Application Information

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IPC IPC(8): C01G49/04
CPCC01G49/04Y02P10/20
Inventor 熊道陵李檬邱萍卢雄雄张灿文文明福欧阳少波邹来禧
Owner JIANGXI UNIV OF SCI & TECH
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