Process for extracting ammonium chloride from waste etching liquid and evaporation and concentration system thereof

An evaporative concentration system and a technology for waste etching solution, which are applied in the field of technology and its evaporative concentration system, can solve the problems of low value and low purity of ammonium chloride, and achieve the effects of improving recovery rate, low energy consumption and good adsorption effect.

Pending Publication Date: 2020-12-29
温州科锐环境资源利用有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] This method has the following defects: due to the removal of ammonium ion (NH 4+ ), chloride ion (CL - ), and unextracted copper ions (Cu 2+ ) and other heavy metal impurities, although

Method used

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  • Process for extracting ammonium chloride from waste etching liquid and evaporation and concentration system thereof
  • Process for extracting ammonium chloride from waste etching liquid and evaporation and concentration system thereof
  • Process for extracting ammonium chloride from waste etching liquid and evaporation and concentration system thereof

Examples

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Example Embodiment

[0038]Example 1

[0039]In order to obtain higher purity ammonium chloride products, this application proposes a process for extracting ammonium chloride from waste etching solution, which at least includes the following steps:

[0040]S1. Filter the alkaline waste etching solution to remove suspended impurities and adjust the pH to 9 to obtain solution a;

[0041]S2, the solution a enters the packed extraction tower for extraction, and the extractant and diluent with a volume concentration ratio of 4:1 are introduced into the packed extraction tower in advance, and the extraction temperature is set to 10°C to obtain organic phase b and raffinate c;

[0042]S3, adding hydrochloric acid to the raffinate c for conditioning to obtain solution d;

[0043]S4. In the fixed bed adsorption equipment, adjust the pH to 4, and use L-glutamic acid chelating resin to adsorb heavy metal ions in solution d for 5 minutes to obtain ammonium chloride solution e and desorption solution f;

[0044]S5. Obtain ammonium ch...

Example Embodiment

[0055]Example 2

[0056]S1. Filter the alkaline waste etching solution to remove suspended impurities and adjust the pH to 9.5 to obtain solution a;

[0057]S2, the solution a enters the packing extraction tower for extraction, and the extractant and diluent with a volume concentration ratio of 4:2 are introduced into the packing extraction tower in advance, and the extraction temperature is set to 30°C to obtain organic phase b and raffinate c;

[0058]S3, adding hydrochloric acid to the raffinate c for conditioning to obtain solution d;

[0059]S4. In the fixed bed adsorption equipment, adjust the pH to 6, and use L-glutamic acid chelating resin to adsorb heavy metal ions in solution d for 6 minutes to obtain ammonium chloride solution e and desorption solution f;

[0060]S5. Obtain ammonium chloride concentrated solution g by evaporating and concentrating the ammonium chloride solution e, where the evaporative concentration time is 45 min;

[0061]S6, cooling and crystallization of the concentrate...

Example Embodiment

[0063]Example 3

[0064]S1. Filter the alkaline waste etching solution to remove suspended impurities and adjust the pH to 10 to obtain solution a;

[0065]S2, solution a enters the packing extraction tower for extraction, and only the same concentration of extractant is introduced into the packing extraction tower in advance, and the extraction temperature is set to 60°C to obtain the organic phase b and raffinate c;

[0066]S3, adding hydrochloric acid to the raffinate c for conditioning to obtain solution d;

[0067]S4. In the fixed bed adsorption equipment, adjust the pH to 8, and use L-glutamic acid chelating resin to adsorb heavy metal ions in solution d for 7 minutes to obtain ammonium chloride solution e and desorption solution f;

[0068]S5. Obtain ammonium chloride concentrated solution g by evaporating and concentrating the ammonium chloride solution e, where the evaporative concentration time is 60 min;

[0069]S6, cooling and crystallization of the concentrated ammonium chloride solution...

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Abstract

The invention discloses a process for extracting ammonium chloride from a waste etching solution and an evaporation and concentration system thereof, and the process comprises the following steps: S1,filtering an alkaline waste etching solution to remove suspended impurities to obtain a solution a, and adjusting the pH value to 9-10; S2, enabling the solution a to enter a filler extraction towerto be extracted, so as to obtain an organic phase b and raffinate c; S3, adding hydrochloric acid into the raffinate c for tempering to obtain a solution d; S4, in fixed bed adsorption equipment, adsorbing heavy metal ions in the solution d by adopting L-glutamic acid chelating resin to obtain an ammonium chloride solution e and a desorption solution f; S5, evaporating and concentrating the ammonium chloride solution e to obtain an ammonium chloride concentrated solution g; and S6, cooling and crystallizing the ammonium chloride concentrated solution g. The evaporation and concentration systemcomprises a liquid feeding device, a negative pressure evaporation device, a condensation device and a condensate water collection device which are connected through pipelines. The method can be applied to waste liquid treatment plants and has the advantage of extracting the purity of ammonium chloride.

Description

technical field [0001] The invention relates to the technical field of ammonium chloride recovery, more specifically, it relates to a process for extracting ammonium chloride from waste etching solution and an evaporation and concentration system thereof. Background technique [0002] Printed circuit board (PCB) is an important part of electronic products. In recent years, with the rapid development of the electronic industry, the demand for PCB is increasing, and the PCB industry has achieved rapid development. With the continuous development of the PCB industry, the environmental protection issues of this industry are becoming more and more important. One of the main pollution is the large amount of copper-containing etching waste produced in the etching process. This waste liquid mainly comes from the PCB etching process. The etching liquid can corrode the excess copper foil on the circuit board, so that the concentration of copper ions in the etching liquid increases con...

Claims

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Application Information

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IPC IPC(8): C01C1/16C02F9/10C02F101/16C02F101/20C02F103/34
CPCC01C1/164C02F9/00C02F1/001C02F1/66C02F1/04C02F1/285C02F1/26C02F1/046C02F2001/5218C02F1/52C02F2101/20C02F2101/16C02F2103/346Y02P10/20
Inventor 麻洪明林小胡何朋朋
Owner 温州科锐环境资源利用有限公司
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