Method for removing ammonia nitrogen from hydrazine hydrate reduced liquid

A technology of hydrazine hydrate and ammonia nitrogen, applied in chemical instruments and methods, water pollutants, water/sewage multi-stage treatment, etc., can solve problems such as harsh working environment and inability to meet industrial wastewater discharge requirements, and achieve short reaction time and high dosage The effect of small size and simple process

Pending Publication Date: 2022-07-29
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The content of metal ions such as gold, platinum, palladium, rhodium, iridium, nickel, and copper in it is less than 1ppm, and contains a large amount of harmful ions such as ammonia nitrogen. Using the existing sodium sulfide treatment method to treat wastewater will produce a large amount of hydrogen sulfide gas, resulting in a poor working environment on site and Unable to meet the discharge requirements of industrial wastewater in the Industrial Pollutant Discharge Standard (GB 25467-2010)

Method used

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  • Method for removing ammonia nitrogen from hydrazine hydrate reduced liquid
  • Method for removing ammonia nitrogen from hydrazine hydrate reduced liquid
  • Method for removing ammonia nitrogen from hydrazine hydrate reduced liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] (1) Take 3.5L of palladium refining hydrazine hydrate reduction liquid wastewater, measure the ammonia nitrogen concentration to 982g / L, adjust the pH to 9, add 400ml of hydrogen peroxide with a mass fraction of 10%, and pretreat at 85 °C for 1 h. The reaction was vigorously exothermic and a large amount of white foam was produced.

[0011] (2) After the reaction is stable, the pH of the solution is adjusted to 11 with sodium hydroxide solution. Put it on an electric hot plate at 80°C for micro-boiling evaporation. After 2-8 hours of evaporation, filter the residue to separate the liquid. The removal rate of ammonia nitrogen is measured as shown in the table below, and the filtrate is discharged to the standard.

[0012] Processing effect

[0013]

Embodiment 2

[0015] (1) Take 3.5L of palladium refining hydrazine hydrate reduction liquid wastewater, measure the ammonia nitrogen concentration to 982g / L, adjust the pH to 9, add 400ml of hydrogen peroxide with a mass fraction of 5%-15%, and pretreat at 85 °C for 1 h. The reaction was exothermic and a white foam was produced.

[0016] (2) After the reaction is stable, the pH of the solution is adjusted to 11 with sodium hydroxide solution. It was placed on an electric hot plate at 80°C for micro-boiling evaporation. After 2 hours of evaporation, the residue was separated by filtration. The removal rate of ammonia nitrogen was measured as shown in the table below, and the filtrate was discharged to the standard.

[0017] Processing effect

[0018]

Embodiment 3

[0020] (1) Take 3.5L of palladium refining hydrazine hydrate reduction liquid wastewater, measure the ammonia nitrogen concentration to 982g / L, adjust the pH to 9-11, add 400ml of hydrogen peroxide with a mass fraction of 10%, and pretreat at 85 °C for 1 h. The reaction was vigorously exothermic and a white foam developed.

[0021] (2) After the reaction is stable, the pH of the solution is adjusted to 11 with sodium hydroxide solution. It was placed on an electric hot plate at 80°C for micro-boiling evaporation. After 2 hours of evaporation, the residue was separated by filtration. The removal rate of ammonia nitrogen was measured as shown in the table below, and the filtrate was discharged to the standard.

[0022] Processing effect

[0023]

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Abstract

The invention discloses a method for removing ammonia nitrogen from hydrazine hydrate reduced liquid, which comprises the following steps: adjusting the pH value of hydrazine hydrate reduced liquid wastewater to 8-10, adding hydrogen peroxide, and pretreating at 80-85 DEG C for 1-1.5 hours; and after the reaction is stable, adjusting the pH value of the solution to 9-12 by using a sodium hydroxide solution, carrying out micro-boiling evaporation at 80-90 DEG C for 4-8 hours, filtering to separate slag from liquid, and discharging the filtrate after reaching the standard. The ammonia-nitrogen-containing wastewater in precious metal production is treated by adopting a combined process, the process flow is simple, the reaction time is short, the dosage of a treatment reagent is small, and certain economic benefits are achieved; and the treatment effect is good, the removal rate of ammonia nitrogen in the treated liquid is greater than 99.80%, and the discharge requirement is met.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method for removing ammonia nitrogen in wastewater after reduction of hydrazine hydrate. Background technique [0002] With the aggravation of water crisis and the concept of green and sustainable development, people pay more and more attention to environmental issues. Due to the precious metal production process, a large amount of mixed waste liquid containing ammonia nitrogen ions and metal ions will be generated. As we all know, the discharge of ammonia nitrogen wastewater into water bodies not only causes eutrophication of water bodies, black and odorous water bodies, but also increases the difficulty and cost of water treatment, and even has toxic effects on people and organisms. The liquid after reduction of hydrazine hydrate is in the production process of precious metals, in the later stage of platinum and palladium refining, after reduction of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F101/16
CPCC02F9/00C02F1/66C02F1/722C02F1/048C02F1/001C02F2101/16C02F2209/06C02F2209/14C02F2301/08
Inventor 邢晓钟赵彦才杨丽虹潘从明李生民赵昭郭晓辉
Owner JINCHUAN GROUP LIMITED
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