Recovery treatment method of acidic etching waste liquor

A treatment method and resource-based technology, applied in the field of advanced treatment of wastewater in the chemical industry

Active Publication Date: 2014-12-03
BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no precedent for purely using membrane separation technology to treat acidic etching waste

Method used

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  • Recovery treatment method of acidic etching waste liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A kind of acidic etching waste liquid, wherein CuCl 2 The content is 160g / L, the NaCl content is 100g / L, the HCl content is 10g / L, the solution pH=0.52, and the water inflow is 5m 3 / h.

[0043] Firstly, the acidic etching waste liquid is heated to 45°C, then filtered through the security filter and then enters from the bottom of the hollow fiber hydrophobic membrane module, and the other side of the membrane is fed with deionized water, and the hydrogen chloride gas passing through the hydrophobic membrane is absorbed by the deionized water to obtain Dilute hydrochloric acid solution and flow into the middle tank of hydrochloric acid. In this process, the hydrogen chloride removal rate of the single-stage membrane is 60%, the number of membrane stages is 5, and each stage is 10 membranes. The hydrochloric acid content in the effluent is 150mg / L, and the hydrogen chloride gas removal rate reaches 97%. % dilute hydrochloric acid solution. In addition, the pressure ...

Embodiment 2

[0046] A kind of acidic etching waste liquid, wherein CuCl 2 The content is 160g / L, the NaCl content is 100g / L, the hydrochloric acid HCl content is 10g / L, the solution pH=0.52, and the water inflow is 5m 3 / h.

[0047] Firstly, the acidic etching waste liquid is heated to 46°C, then filtered through the security filter and enters from the bottom of the hollow fiber hydrophobic membrane module, and the other side of the membrane is fed with deionized water to absorb the hydrogen chloride gas passing through the hydrophobic membrane to obtain a dilute hydrochloric acid solution and flow it into hydrochloric acid middle slot. The removal rate of the single-stage membrane selected for the hydrophobic membrane module is 60%, the number of membrane stages is set to 6, and each stage is also 10 membranes. The pressure on the etching liquid side is greater than that on the absorbing liquid side. It is 180mg / L, and at the same time, a 0.3% dilute hydrochloric acid solution is obtain...

Embodiment 3

[0050] A kind of acidic etching waste liquid, wherein CuCl 2 The content is 160g / L, the NaCl content is 100g / L, the hydrochloric acid HCl content is 10g / L, the solution pH=0.52, and the water inflow is 5m 3 / h.

[0051] Firstly, the acidic etching waste liquid is heated to 48°C, then filtered through the security filter and enters from the bottom of the hollow fiber hydrophobic membrane module, and the other side of the membrane is fed with deionized water to absorb the hydrogen chloride gas passing through the hydrophobic membrane to obtain a dilute hydrochloric acid solution and flow it into hydrochloric acid middle slot. The hydrogen chloride removal rate of the single-stage membrane used in the hydrophobic membrane module is 60%. The number of membrane stages is 7, and each stage also has 10 membranes. The pressure on the side of the etching waste liquid is greater than that of the side of the absorption liquid. MPa. The HCl content in the effluent is 210mg / L, and a 0.5...

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Abstract

The invention discloses a recovery treatment method of acidic etching waste liquor, which comprises the following steps: carrying out heating treatment on waste liquor, removing hydrogen chloride gas with a hydrophobic membrane component to obtain a pure hydrochloric acid solution and a salt solution containing heavy metal copper ions, separating the copper ion salt solution through a nanofiltration system to obtain concentrated water containing heavy metal copper ions and a sodium chloride solution, evaporating the heavy metal copper ion concentrated water to crystallize, and recovering acid and alkali from the sodium chloride solution through a bipolar membrane system. The membrane separation technique is comprehensively utilized to recover all components in the acidic etching waste liquor. The method is simple in technique and convenient to operate, does not need to add any chemical reagent in the whole treatment process, can recycle the permeation liquid, does to generate secondary pollution, can obtain CuCl2 crystals and NaCl crystals with higher purity, and has favorable market value and inestimable application prospects.

Description

Technical field: [0001] The invention relates to the field of advanced treatment of wastewater in the chemical industry, in particular to a method for resourceful treatment of acidic etching waste liquid. Background technique: [0002] In industrial production, especially in the production process of PCB boards, acid etching is a common etching method. During the etching process, when the concentration of copper ions and cuprous ions in the acid etching solution increases to a certain value, the etching solution The copper foil cannot be etched stably and quickly. At this time, the etching solution becomes an etching waste solution. Since the acidic etching waste solution contains a large amount of heavy metal copper and its strong acidity, direct discharge will not only bring great damage to the surrounding environment, And it also involves a serious waste of resources, which is related to the dual problems of the environment and the efficiency of the factory. [0003] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
Inventor 林晓刘晨明李志强
Owner BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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