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Comprehensive utilization method of ammonium chloride wastewater

An ammonium chloride and wastewater technology, applied in chemical instruments and methods, metallurgical wastewater treatment, water pollutants, etc., can solve the problems of high energy consumption and high treatment costs, and achieve the effect of reducing wastewater treatment costs and shortening wastewater treatment time.

Active Publication Date: 2020-08-25
BAOTOU RES INST OF RARE EARTHS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The evaporation crystallization method can achieve zero discharge of wastewater, but the energy consumption and treatment cost are high in the process of wastewater pretreatment and evaporation crystallization

Method used

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  • Comprehensive utilization method of ammonium chloride wastewater

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Experimental program
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Effect test

preparation example Construction

[0024]

[0025] The ammonium chloride wastewater produced in the rare earth smelting process is formed into a mixed solution of hydrochloric acid and ammonium chloride. For example, ammonium chloride wastewater, hydrochloric acid solution and optionally water are mixed to obtain a hydrochloric acid-ammonium chloride mixed solution. In the ammonium chloride wastewater generated during rare earth smelting, the concentration of ammonium chloride is generally 0.5-3.5mol / L. The concentration of the hydrochloric acid solution is not particularly limited, for example, the concentration of HCl may be 15-37wt%, including 37wt% concentrated hydrochloric acid. In some embodiments, the ammonium chloride wastewater, hydrochloric acid solution and water are uniformly mixed to obtain a hydrochloric acid-ammonium chloride mixed solution. In other embodiments, the ammonium chloride wastewater and the hydrochloric acid solution are uniformly mixed to obtain a hydrochloric acid-ammonium chlor...

Embodiment 1

[0066] Mix the 3mol / L ammonium chloride waste water produced in the rare earth smelting process with concentrated hydrochloric acid and condensed water to obtain a mixed solution I of hydrochloric acid-ammonium chloride (the concentration of HCl is 0.75mol / L, and the concentration of ammonium chloride is 1.7mol / L).

[0067] Mix 20 g of hydrochloric acid-ammonium chloride mixed solution I with 100 g of NdFeB magnet waste (particle size less than 120 μm) to obtain a solid-liquid mixture. 2 g of hydrogen peroxide was added to the solid-liquid mixture, and the reaction was carried out in an air atmosphere at 25° C. to form the first reactant. When the water content of the first reactant was 2.7 wt%, 40 g of condensed water was added to the first reactant to continue the reaction to form the second reactant. When the water content in the second reaction material was 3.2 wt%, 40 g of condensed water was added to the second reaction material to continue the reaction. By analogy, c...

Embodiment 2

[0071] Mix the 3.5mol / L ammonium chloride waste water produced in the rare earth smelting process with concentrated hydrochloric acid and condensed water to obtain a mixed solution I of hydrochloric acid-ammonium chloride (the concentration of HCl is 0.55mol / L, and the concentration of ammonium chloride is 0.5 mol / L).

[0072] 25g of hydrochloric acid-ammonium chloride mixed solution I and 100g of NdFeB magnet waste (particle size less than 120 μm) were uniformly mixed to obtain a solid-liquid mixture. 3 g of hydrogen peroxide was added to the solid-liquid mixture, and the oxidation reaction was carried out in an air atmosphere at 40° C. to form a first reactant. When the water content of the first reactant is 3.5 wt%, 50 g of condensed water is added to the first reactant material to continue the reaction to form the second reactant. When the water content in the second reactant was 2.8 wt%, 50 g of condensed water was added to the second reactant to continue the reaction. ...

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Abstract

The invention discloses a comprehensive utilization method of ammonium chloride wastewater. The comprehensive utilization method comprises the following steps: (1) forming a hydrochloric acid-ammoniumchloride mixed solution I from the ammonium chloride wastewater; (2) mixing the hydrochloric acid-ammonium chloride mixed solution I with a neodymium-iron-boron magnet waste material to obtain a solid-liquid mixture; reacting the solid-liquid mixture with hydrogen peroxide at 5-60 DEG C to obtain an oxidation product; wherein the ammonium chloride wastewater is ammonium chloride wastewater generated in a rare earth smelting process. The comprehensive utilization method provided by the invention can realize the reutilization of the ammonium chloride wastewater in recovery of the neodymium-iron-boron magnet waste material.

Description

technical field [0001] The invention relates to a comprehensive utilization method of ammonium chloride waste water, in particular to a comprehensive utilization method of ammonium chloride waste water produced in the rare earth smelting process. Background technique [0002] In the rare earth smelting process, a large amount of ammonium chloride wastewater will be generated in the process of extraction separation and rare earth carbonate precipitation. The treatment methods for ammonium chloride wastewater mainly include stripping method, ion exchange method, precipitation method and concentration crystallization method. [0003] The stripping method is to pass the gas into the water, increase the pH value to convert the ammonium ions in the wastewater into free ammonia, and then use air to blow off the free ammonia into ammonia gas for recycling, so as to achieve the purpose of removing ammonia nitrogen in the wastewater. The stripping method is suitable for the treatment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01G51/04C01F17/241C01F17/224C02F101/12C02F101/16C02F103/16
CPCC02F9/00C01G51/04C01F17/241C01F17/224C02F1/66C02F1/26C02F1/54C02F2101/12C02F2101/16C02F2103/16C01P2006/80
Inventor 赵永志马莹帅国胜候少春笪宗扬李二斗丁艳蓉张文娟宋静赵拓王晶晶
Owner BAOTOU RES INST OF RARE EARTHS
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