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Method for extracting lanthanum from coal ash

A fly ash and extraction technology, which is applied in the direction of improving process efficiency, can solve the problems that do not involve the separation and extraction of lanthanum, and do not mention the extraction technology of rare earth elements, etc., and achieve the effect of simple method and easy operation

Active Publication Date: 2016-09-28
CHINA SHENHUA ENERGY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is mainly process control, but does not mention the extraction technology of rare earth elements, let alone the separation and extraction of lanthanum

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A method for extracting lanthanum from fly ash, comprising the following steps:

[0045] (1) Fly ash is acid-dissolved with hydrochloric acid to prepare pickling solution: the fly ash and hydrochloric acid with a concentration of 25wt% are mixed according to the ratio of 1g:4ml, and reacted at 120°C for 2h, then filtered to obtain the pickling solution;

[0046] (2) Extraction and separation to obtain rare earth mixed solution: according to the ratio of sulfosalicylic acid aqueous solution and aluminum oxide in the pickling solution, it is 250mL: 1g, adding concentration is 50wt% sulfo group in the pickling solution that step (1) makes A complex reaction of salicylic acid aqueous solution, then adding P507 and kerosene to it, extracting and separating the rare earth elements from the acid leaching solution, and adding hydrochloric acid to the extract phase for back extraction and separation , to obtain rare earth mixed solution; wherein, the saponification rate of P507 ...

Embodiment 2

[0051] A method for extracting lanthanum from fly ash, comprising the following steps:

[0052] (1) Fly ash is acid-dissolved with hydrochloric acid to prepare pickling solution: the fly ash and hydrochloric acid with a concentration of 25wt% are mixed according to the ratio of 1g:4ml, and reacted at 120°C for 2h, then filtered to obtain the pickling solution; The specific steps are: a) crush the fly ash to less than 100 mesh, add water to prepare a slurry with a solid content of 20-40 wt%, and remove iron by wet magnetic separation to reduce the iron content in the fly ash to below 1.0 wt% , filter to obtain a filter cake; b) add hydrochloric acid to the filter cake obtained in step a) for reaction, and then carry out solid-liquid separation to obtain an acid dipping solution;

[0053] (2) Extraction and separation to obtain rare earth mixed solution: according to the ratio of sulfosalicylic acid aqueous solution and aluminum oxide in the pickling solution, it is 300mL: 1g, a...

Embodiment 3

[0058] A method for extracting lanthanum from fly ash, comprising the following steps:

[0059] (1) Fly ash is acid-dissolved with hydrochloric acid to prepare pickling solution: the fly ash and hydrochloric acid with a concentration of 25wt% are mixed according to the ratio of 1g:4ml, and reacted at 120°C for 2h, then filtered to obtain the pickling solution;

[0060] (2) Extraction and separation to obtain rare earth mixed solution: according to the ratio of sulfosalicylic acid aqueous solution and aluminum oxide in the pickling solution, it is 200mL: 1g, adding a concentration of 60% sulfonic acid to the pickling solution prepared in step (1) The salicylic acid aqueous solution is subjected to a complexation reaction, and then P507 and kerosene are added thereto, the rare earth elements are extracted and separated from the acid leaching solution, and concentrated hydrochloric acid is added to the extraction phase for back extraction and separation, so as to obtain a rare ear...

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PUM

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Abstract

The invention provides a method for extracting lanthanum from coal ash. The method comprises the following steps that 1, coal ash is acidified and dissolved through hydrochloric acid to be prepared into an acidic leaching solution, particularly, the coal ash and the hydrochloric acid are mixed and reacted, then, filtration is carried out, and the acidic leaching solution is obtained; 2, sulfosalicylic acid is added into the acidic leaching solution prepared in the step 1 for a complex reaction, then, an extraction agent is added for extracting and separating the rare earth element in the acidic leaching solution, and hydrochloric acid is added into the extraction phase for reextracting and separating the rare earth element in the extraction phase, and a rare earth mixed solution is obtained; and 3, resin is extracted for separation to obtain a lanthanum solution, particularly, the impregnating resin is prepared, the rare earth mixed solution obtained in the step 2 is used for extracting the resin to separate lanthanum, a leacheate is used for leaching the impregnating resin with lanthanum adsorbed, and a lanthanum solution is obtained. The method for extracting the lanthanum from the coal ash is simple and easy to operate, lanthanum can be extracted from coal ash, and the extraction rate and extraction purity are high.

Description

technical field [0001] The invention belongs to the field of extraction of rare earth elements, in particular to a method for extracting lanthanum from fly ash. Background technique [0002] my country is rich in rare earth resources. At present, rare earth elements are generally extracted from rare earth deposits. According to the output status of rare earth elements in rare earth deposits, ion exchange methods, step-by-step precipitation methods, etc. are commonly used in industry to extract rare earth elements. The extractant is used for rare earth separation. However, methods for extracting rare earth elements such as ion exchange method and step-by-step precipitation method are only applicable to existing rare earth deposits, and the method of separating rare earth elements with ammoniated extractant will produce a large amount of ammonia nitrogen wastewater, which seriously pollutes the environment. my country is a big coal-burning country, and a large amount of fly as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B59/00
CPCC22B7/007C22B7/02C22B59/00Y02P10/20
Inventor 郭昭华王丹妮池君洲魏存弟薛兵周永利李楠徐少南程妍许立军
Owner CHINA SHENHUA ENERGY CO LTD
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