A kind of preparation method of rare earth carbonate that does not produce ammonia nitrogen wastewater

A technology for rare earth carbonate and ammonia nitrogen wastewater, applied in the fields of rare earth metal compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problem of large consumption of chemicals, high cost of treatment chemicals, and the impossibility of effluent reaching the national first-level or second-level discharge standards and other problems, to achieve the effect of easy washing of impurities and improving the utilization rate of rare earth

Inactive Publication Date: 2016-08-24
GANZHOU XINLONGKANG RARE EARTH
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Problems solved by technology

Although the continuous chemical precipitation method has smaller investment and floor space than the A / O method, its consumption of chemicals is too large, the ratio of N:P:Mg is 1:1.1-1.2, the cost of treating chemicals is too high, and It is impossible for the effluent to meet the national primary or secondary discharge standards
In the prior art, not only the ammonia nitrogen wastewater cannot be effectively treated, but also there are still many problems in the production process of rare earth carbonic acid

Method used

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  • A kind of preparation method of rare earth carbonate that does not produce ammonia nitrogen wastewater

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preparation example Construction

[0019] The working principle of this implementation is very simple, a method for preparing rare earth carbonate that does not produce ammonia nitrogen wastewater, the steps are as follows:

[0020] (1) prepare rare earth solution, measure acidity by pH-3C acidity meter, if the acidity is too high, rare earth feed liquid is placed in the heating container, under the condition of ventilating, heat, the dehydration moisture of rare earth feed liquid reaches 50%, ensure Stop heating when excess acid has evaporated;

[0021] (2) Put the deacidified rare earth solution in a special stirring container, and add ammonium bicarbonate as a precipitant;

[0022] (3) Collect the discharged carbon dioxide, add calcium peroxide in the carbon dioxide container, eliminate carbon dioxide bubbles, release oxygen and generate water;

[0023] (4) Use ammonium bicarbonate as a precipitant again, keep the temperature at 25°C ± 1°C, until the pH value of the clear liquid is 7.0-8.0, go through a deh...

Embodiment 1

[0030] (1) Take 1.5 grams of pure rare earth oxide and dissolve it in acid, measure the acidity by pH-3C acidity meter, heat it to 80 degrees with 1M HO340ML, and stop deacidification after one hour.

[0031] (2) Taking the volume unit as a reference, mix and stir the rare earth solution and ammonium bicarbonate at a ratio of 10:1, and add ammonium bicarbonate dropwise to the rare earth solution every five minutes.

[0032] (3) When a large amount of carbon dioxide bubbles are generated, collect the carbon dioxide bubbles, add corresponding calcium peroxide into the carbon dioxide collection tube, and react to generate water and oxygen.

[0033] (4) Ammonium bicarbonate is used again to precipitate rare earths, and the pH value is reduced to increased. When the pH value is 7.0-8.0, the formation of crystal nuclei is fast.

[0034] (5) The precipitate is dehydrated and washed for 15 minutes to obtain rare earth carbonate.

[0035] (6) Recover the waste water left after washing...

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Abstract

The invention discloses a preparation method of rare earth carbonate free of generation of ammonia-nitrogen wastewater, and belongs to the technical field of production of rare earth carbonate. The method comprises the following steps: deacidifying by a rare-earth solution; precipitating rare earth by using ammonium bicarbonate; collecting carbon dioxide bubbles generated during rare earth participation; carrying out chemical reaction on carbon dioxide and calcium peroxide to release oxygen and water; participating rare earth by using ammonium bicarbonate again; dewatering and washing a rate block which is crystallized when the pH value is greater than 7 until the rare earth carbonate is obtained; and carrying out environmental-friendly and energy-saving treatment on the left ammonia-nitrogen wastewater, thereby achieving pollution-free production when the deamination rate and the denitrification rate reach 99.9%. The preparation method has the advantages of fully utilizing the ammonium bicarbonate to participate the rate earth, and effectively processing non-environmental-friendly processes in the production process, and therefore, cyclic utilization of resources and environmental-friendly production are achieved.

Description

technical field [0001] The invention relates to the technical field of rare earth carbonate production, in particular to a method for preparing rare earth carbonate that does not generate ammonia nitrogen wastewater. Background technique [0002] Rare earths are known as "industrial vitamins". They have excellent optical, electrical, magnetic, superconducting, catalytic and other physical properties, and can be combined with other materials to form new materials with different properties and varieties. It is an indispensable core resource for strategic industries such as new energy and new materials. Among them, rare earth in the form of rare earth carbonate is an indispensable raw material in many industries. At present, there are more and more processes for making rare earth carbonates, but usually the processes for making rare earth carbonates will produce high-concentration ammonia nitrogen wastewater. Now domestic wastewater discharge standards are becoming more and m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/00
Inventor 刘名清
Owner GANZHOU XINLONGKANG RARE EARTH
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