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A kind of recycling method of copper-containing industrial waste liquid

A technology for industrial waste liquid and waste liquid, applied in chemical instruments and methods, multi-stage water/sewage treatment, water pollutants, etc., can solve the problems of heavy metal ions and fluorine elements that are difficult to meet the standards stably, expensive equipment, waste of resources, etc. Achieve effective organic matter removal effect, good purification treatment effect, and reduce treatment cost

Active Publication Date: 2016-12-07
WENZHOU JINYUAN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If such a high-concentration copper ion waste liquid is not treated, it is bound to cause very serious harm to the ecological environment, especially water resources.
[0004] Not only that, the waste liquid with a high content of heavy metals in the production process of printed circuit boards originally has a strong recycling value. Elements, etc. are difficult to meet the standards stably, and it is difficult to play the role of recovering valuable metals, and the treatment methods and equipment that can effectively recover valuable imports and exports are extremely expensive
Therefore, enterprises often use the traditional chemical coagulation and sedimentation method to react the heavy metals in the waste liquid to form sludge and then implement waste landfill. Some unscrupulous manufacturers even directly discharge the heavy metal waste liquid into the river regardless of the life and death of the surrounding people. As a result, it not only causes serious pollution to the environment, but also causes the heavy metals in the waste liquid to not be effectively recovered, resulting in a waste of resources and an increase in the cost of printed circuit boards.
[0005] In addition, these copper or other heavy metal waste liquids of printed circuit boards usually have high COD (chemical oxygen demand) and BOD (biochemical oxygen demand), which requires a very complicated waste liquid treatment system and high treatment costs. Moreover, even if a large amount of water is used for dilution after treatment, COD, etc. are still difficult to reach the standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Select the alkaline waste liquid and acidic copper-containing waste liquid produced in the printed circuit board preparation process as the original liquid for treatment and recovery, mix the two, adjust the pH value of the mixed waste liquid to 8.0, and then add flocculant for organic matter and Preliminary sedimentation treatment of copper precipitates; the flocculant is polyaluminum chloride and dimethyl diallyl ammonium chloride, the weight ratio of the two is about 2:1, relative to 1L of the waste liquid, it is added The amount is 0.08g; the primary sedimentation treatment is carried out under the condition of stirring at a temperature of 40°C;

[0028] 2) The waste liquid after the preliminary sedimentation treatment is left to stand and cooled to below 20° C., and then filtered through a filter with a mesh diameter of 50 μm to obtain a filtrate.

[0029] 3) adopting the acidic solution containing 45% sulfuric acid and 10% ferrous sulfate to continue to adjust ...

Embodiment 7

[0034] The particle size of activated carbon in step 3) in Example 7 was 150 μm, and activated carbon was not used in step 3) in Example 8.

Embodiment 9

[0035] In Example 9, the polyaluminum chloride in step 3) was replaced with dimethyl diallyl ammonium chloride.

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Abstract

The invention provides a copper-containing industrial waste liquid recycling method; an alkaline waste liquid and an acidic copper-containing waste liquid in printed circuit boards are selected as raw liquids, and a two-step pH value adjustment process having pre-sedimentation is adopted, so that high-concentration organic matters can be more effectively removed, so as to achieve a better purifying treatment effect. Moreover, in the process of two times of sedimentation treatments, a treatment temperature is gradually increased, so that re-aggregation of decomposed organic matter particles can be effectively avoided so as to avoid an adsorbing effect from being affected. At different stages of sedimentation, flocculation sedimentation materials with different properties and parameters are targetedly selected and used, and thus the more effective organic matter removal effect is obtained. The pH value of sedimentation is reasonably set, so as to be more beneficial to decomposition of the organic matters. A special acidic solution is used for adjusting the pH value so as to obtain a better organic matter decomposition adsorption effect. The organic matters are further decomposed by adding an appropriate amount of hydrogen peroxide, so as to better make the organic matters adsorbed and settled.

Description

technical field [0001] The invention relates to a treatment process for industrial waste liquid, in particular to a recycling method for copper-containing industrial waste liquid. Background technique [0002] In recent years, with the rapid development of my country's electronics industry, the manufacturing consumption of circuit board products as the basis of the electronics industry has also increased sharply. As of 2005, my country has become the world's largest production base of printed circuit boards, and there are a large number of The printed circuit boards of electronic products will be produced and assembled in my country, and the annual output of PCBs exceeds 200 million m 3 . [0003] Among them, in the preparation process of printed circuit boards, the etching process is a very important process, which is widely used in processes such as black / brown oxidation, PTH plated through holes, full-board copper plating, and line copper plating. will produce a large am...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/20
Inventor 黄日新
Owner WENZHOU JINYUAN CHEM CO LTD
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