Rare earth compound recycling method utilizing waste rare earth polishing powder

A rare earth polishing powder and rare earth compound technology, applied in the direction of improving process efficiency, can solve the problems of unacceptable large-scale production, difficult industrial production, and low quality, and achieve the level of comprehensive utilization of secondary resources and equipment manufacturing Low cost and improved separation efficiency

Active Publication Date: 2015-09-30
LUODIYA RARE EARTH BAOTOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can only be tried in the laboratory and cannot be applied in large-scale industrial production
The reason is that it is difficult to achieve industrial production by mixing and dispersing under the high-speed operation of 3000-5000 revolutions per minute.

Method used

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  • Rare earth compound recycling method utilizing waste rare earth polishing powder

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Embodiment 1

[0028] Embodiment 1: A method for recycling rare earth compounds using waste rare earth polishing powder, which includes the following steps: (1) enriching waste rare earth polishing powder to prepare enriched materials for rare earth elements;

[0029] a. Preparation of slurry: add the waste rare earth polishing powder mixture with total amount of rare earth TREO=35wt%, add water and soak for 5 minutes to make slurry, the slurry mass concentration is 20%, then add industrial hydrochloric acid and industrial hydrochloric acid to the slurry If the concentration is greater than 36wt%, adjust the pH value of the slurry to 3 and control the pH value. If the acidity is too strong, the dissolution rate will be too high, which will cause the material to be mushy and difficult to filter and precipitate. Then the slurry is stirred in the mixing agitator for 20 minutes and then enters the spiral classifier by the conduit, and the rotating speed of the mixing agitator is 30 revs / min; It ...

Embodiment 2

[0040] Embodiment 2: A method for recycling rare earth compounds using waste rare earth polishing powder, which includes the following steps: (1) enriching waste rare earth polishing powder to prepare enriched materials for rare earth elements;

[0041] a. Preparation of slurry: add the waste rare earth polishing powder mixture with the total amount of rare earth TREO=35wt%, add water and soak for 10 minutes to make slurry, the slurry mass concentration is 20%, then add industrial hydrochloric acid and industrial hydrochloric acid to the slurry If the concentration is greater than 36wt%, the pH value of the slurry is adjusted to 4, and the pH value is well controlled. The acidity is too strong and the dissolution rate is too high, which will cause the material to be mushy and difficult to filter and precipitate. Then the slurry is stirred in the mixing agitator for 25 minutes and then enters the spiral classifier by the conduit, and the rotating speed of the mixing agitator is ...

Embodiment 3

[0052] Embodiment 3: A method for recycling rare earth compounds by using waste rare earth polishing powder, which includes the following steps: (1) enriching waste rare earth polishing powder to prepare enriched materials for rare earth elements;

[0053] a. Preparation of slurry: add the waste rare earth polishing powder mixture with the total amount of rare earth TREO=35wt%, add water and soak for 8 minutes to make slurry, the slurry mass concentration is 20%, then add industrial hydrochloric acid, industrial hydrochloric acid to the slurry If the concentration is greater than 36wt%, the pH value of the slurry is adjusted to 3, and the pH value is well controlled. If the acidity is too strong, the dissolution rate is too high, which will cause the material to be mushy and difficult to filter and precipitate. Then the slurry is stirred in the mixing agitator for 22 minutes and then enters the spiral classifier by the conduit, and the rotating speed of the mixing agitator is 4...

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Abstract

The invention discloses a rare earth compound recycling method utilizing waste rare earth polishing powder, which comprises the following steps: (1) the waste rare earth polishing powder is subjected to enrichment to prepare an enrichment material of a rare earth element; (2) the enrichment material of the rare earth element is roasted with concentrated sulfuric acid under a low temperature and is subjected to water leaching, and ammonium bicarbonate is used to realize double decomposition for neutralization and filtration cleaning, so that crude carbonic acid rare earth is prepared, and a high-purity rare earth compound is prepared by extraction separation. The invention has the advantages that (1) the separation efficiency is greatly improved, and the total rare earth oxide (TREO) is above 95%; (2) the novel technology is capable of realizing the aim of recycling the rare earth compound from the waste rare earth polishing powder in low cost and high efficiency;(3) the method is simple in operation, the manufacturing costs of required apparatuses are low, the product quality can be guaranteed, and industrial production can be realized; and (4) a lot of waste rare earth polishing powder is recycled so as to solve the problems of environment pollution and resource shortage.

Description

technical field [0001] The invention relates to a method for recycling rare earth compounds, in particular to a method for recycling rare earth compounds using waste rare earth polishing powder. Background technique [0002] With the development of worldwide electronic technology and glass industry, the demand for polishing materials based on rare earth elements is increasing day by day. According to the statistics of international authoritative organizations, in 2013, the rare earth used in the polishing industry accounted for more than 20% of the total amount of rare earth application in the world. In my country, the annual consumption of rare earth polishing materials is 25,000 tons. Especially with the rapid development of my country's mobile phone and liquid crystal display industries, the demand for rare earth polishing materials is growing at an annual rate of 15%. It has become an important application field of my country's rare earth industry. At the same time, du...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B59/00
CPCY02P10/20
Inventor 任峰杨启山
Owner LUODIYA RARE EARTH BAOTOU
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