Copper nitrate-containing wastewater recovery method, and urea-ammonium nitrate liquid fertilizer preparation method

A recovery method and technology of ammonium nitrate solution are applied in the field of resource recovery and utilization of copper nitrate-containing wastewater, which can solve the problems of limitation, complex reaction conditions and high processing cost, and achieve low cost, high application value and simple production process. Effect

Active Publication Date: 2017-10-20
SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Physicochemical treatment of nitrate wastewater has high treatment cost and low efficiency, and also produces high-concentration nitrate wastewater. It is only a process of transferring and concentrating pollutants, and does not actually remove pollutants. Subsequent treatment is very difficult. method is limited in practice
Biological denitrification is very effective in removing nitrate nitrogen in wastewater with strong biodegradability, but it has little effect and slow removal rate when treating wastewater with high content of toxic substances and poor biodegradability
The chemical method has the disadvantages of complex reaction conditions, difficult control, high energy consumption, and expensive reducing agent.

Method used

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  • Copper nitrate-containing wastewater recovery method, and urea-ammonium nitrate liquid fertilizer preparation method
  • Copper nitrate-containing wastewater recovery method, and urea-ammonium nitrate liquid fertilizer preparation method
  • Copper nitrate-containing wastewater recovery method, and urea-ammonium nitrate liquid fertilizer preparation method

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preparation example Construction

[0028] combine figure 1 , the embodiment of the present invention provides a kind of recovery method that contains copper nitrate waste water and the preparation method of urea ammonium nitrate liquid fertilizer, comprises the following steps:

[0029] S101: Copper nitrate waste water is provided, the copper nitrate waste water is reacted with a neutralizing agent, and filtered to obtain basic copper nitrate and filtrate;

[0030] S102: Purify the filtrate to remove metal impurities, then adjust the pH value of the purified filtrate to 5.5-6.5, and filter to obtain a secondary filtrate;

[0031] S103: evaporating and concentrating the secondary filtrate to obtain an ammonium nitrate solution;

[0032] S104: Add urea to the ammonium nitrate solution, stir until dissolved, and filter to obtain a urea ammonium nitrate solution, which is a urea ammonium nitrate liquid fertilizer.

[0033] The relevant steps are described in detail below.

[0034] In step S101, before the copper...

Embodiment 1

[0040] 1L copper nitrate-containing electroplating wastewater (containing about 55g / L copper, H + =0.65g / L) Slowly add ammonia water to adjust the pH to about 2.0, filter to remove insoluble matter, and obtain the clear liquid, add the clear liquid and ammonia water to the reaction kettle to react and synthesize basic copper nitrate, after the reaction is complete Filter to obtain basic copper nitrate product and filtrate;

[0041] After the obtained filtrate is converted into ammonium-type D403 resin to purify and remove copper and other heavy metal impurities, the pH is adjusted to 6.0 with ammonia water;

[0042] The impurity-removed filtrate was evaporated and concentrated under reduced pressure at 0.06MPa and 100°C to obtain NH 4 NO 3 The mass percent is 58% ammonium nitrate solution;

[0043] Add solid urea into the ammonium nitrate solution, stir and dissolve to obtain urea ammonium nitrate solution.

[0044] Gained urea ammonium nitrate solution product specificati...

Embodiment 2

[0048] 1L copper nitrate-containing electroplating wastewater (copper containing about 80g / L, H + =0.83g / L) Slowly add ammonia water to adjust the pH to about 3.0, filter to remove insoluble matter, and obtain a clear liquid, add the clear liquid and ammonia water to the reaction kettle to react and synthesize basic copper nitrate, after the reaction is complete Filter to obtain basic copper nitrate product and filtrate;

[0049] After the obtained filtrate is converted into ammonium-type D001 resin to purify and remove copper and other heavy metal impurities, the pH is adjusted to 6.5 with ammonia water;

[0050] The impurity-removed filtrate was evaporated and concentrated under reduced pressure at 0.07MPa and 90°C to obtain NH 4 NO 3 The mass percentage is the ammonium nitrate solution of 58.5%;

[0051] Add solid urea into the ammonium nitrate solution, stir and dissolve to obtain urea ammonium nitrate solution.

[0052] Gained urea ammonium nitrate solution product sp...

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Abstract

The invention provides a copper nitrate-containing wastewater recovery method. The method comprises the following steps: providing copper nitrate wastewater, reacting the copper nitrate wastewater with a neutralizer, and filtering the neutralized wastewater to obtain copper nitrate basic and a filtrate; purifying the filtrate to remove metal impurities, adjusting the pH value of the purified filtrate to 5.5-6.5, and filtering the filtrate to obtain a secondary filtrate; carrying out evaporative concentration on the secondary filtrate to obtain an ammonium nitrate solution; and adding urea to the ammonium nitrate solution, stirring the urea and the ammonium nitrate solution until the urea is dissolved, and filtering the obtained solution to obtain a urea-ammonium nitrate solution. The recovery method has the advantages of simple production process, low cost, effective realization of complete recycling of copper and nitrate ions in the copper nitrate wastewater, and no secondary pollution. The invention also provides a preparation method of a urea-ammonium nitrate liquid fertilizer.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a resource recovery method for waste water containing copper nitrate. Background technique [0002] Copper nitrate wastewater widely exists in the field of electroplating, such as: in many processes that use copper as the substrate of the plating, nitric acid is usually used to remove the copper oxide on the surface of the copper before electroplating; when other metal objects are copper-plated, hangers A layer of copper will also be plated thereupon. Over time, there will be a thick layer of copper on the hanger, which generally needs to be cleaned with nitric acid solution, which will produce a large amount of electroplating wastewater containing copper nitrate. These electroplating wastewater containing copper nitrate often contain higher concentrations of Cu 2+ 、H + , NO 3- , and generally the content of impurities such as heavy metals is very low. If they ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05C13/00C01G3/08C01C1/18
CPCC01C1/185C01G3/08C05C1/00C05G5/23C05C9/00
Inventor 郑帅飞周兆安慎义勇米永红王卫红唐瑜钟李钧刘小文刘西茹
Owner SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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