Method for treating acidic copper-containing waste liquid

A treatment method and waste liquid technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as severe corrosion of equipment, health hazards of staff, serious problems, etc., to achieve The method is simple and easy, the process and quality are high, and the effect of long cycle life

Inactive Publication Date: 2013-02-27
长沙铂鲨环保设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, technical personnel familiar with the PCB industry know that the copper etching solution has high technical requirements when working, and the quality index of the etching process of the etching solution recycling technology based on the recovery of copper and copper oxide cannot be guaranteed, because during the electrolysis process In the regenerative etching solution, new substances that have a negative impact on the etching quality (such as side etching factor) will be produced and accumulated continuously, and the cracking and dissolution of the resist layer (such as dry film, film formed after drying the wet film, etc.) substances can also pollute the copper etching solution, so the number of rec

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The acidic etching waste liquid of a circuit board factory in Hunan was determined to contain 130 g / L copper, including 30 g / L cuprous and 182 g / L chloride ions. Get 1 liter of this waste liquid, add 100 milliliters of hydrogen peroxides and record cuprous less than 0.3 gram / liter, it is concentrated, cooled and leave standstill operation to separate out a kind of crystallization after separating out this crystal, weigh its weight as 76 grams, the measured copper content of this crystal is 37.54%, and the chlorine content is 41.65%, which is copper chloride dihydrate. After the separation of copper chloride dihydrate crystals, the separation liquid is added with concentrated hydrochloric acid, ammonium chloride and sodium chlorate to become a kind of liquid with a specific gravity between 1.280 and 1.295 and a divalent copper content between 120 and 150 g / L. between 520-550MV (millivolts) and 4-6N acid equivalent, the acidic etching regeneration solution was etched in t...

Embodiment 2

[0030] The acidic etching waste liquid of a circuit board factory in Guangdong contained 145 g / L of copper, including 32 g / L of cuprous and 195 g / L of chloride ions. Get 1 liter of this waste liquid, add 40 grams of sodium chlorate and record that cuprous is lower than 0.1 gram per liter, it is concentrated, cooled and leave standstill operation and separate out after a kind of crystallization, weigh out after separating out this crystallization Its weight is 71 grams, and the copper content of this crystalline substance is determined to be 37.51%, and the chlorine content is 41.59%, which is cupric chloride dihydrate. 30 grams of crystals, the measured copper content of the crystals is 17.83%, and the chlorine content is 55.03%, which is Na containing two crystal waters. 2 CuCl 4 .2H 2 O. After the separation of the above-mentioned copper compound crystals, the separation liquid is added with concentrated hydrochloric acid, ammonium chloride and sodium chlorate to form a s...

Embodiment 3

[0032]The acidic etching waste liquid of a circuit board factory in Zhejiang Province contained 151 g / L of copper, including 43 g / L of cuprous and 198 g / L of chloride ions. Get 1 liter of the waste liquid, add 59 grams of sodium chlorite and measure cuprous lower than 0.1 g / liter, concentrate, cool and stand still to separate out a kind of crystal, after separating the crystal, it is called It weighed 71 grams, and the copper content of the crystal was determined to be 37.54%, and the chlorine content was 41.53%, which was copper chloride dihydrate. After the separation of the above-mentioned copper chloride dihydrate crystals, the separation liquid is measured and added with concentrated hydrochloric acid, ammonium chloride and sodium chlorite to become a kind of liquid with a specific gravity between 1.280-1.295 and a divalent copper content of 120-150g / Acidic etching regeneration solution between L, oxidation-reduction potential (ORP) between 525-555MV (millivolts), acid e...

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PUM

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Abstract

The invention relates to the field of acidic copper-containing waste liquid treatment and provides a method for treating an acidic copper-containing waste liquid. The method includes the steps that an oxidizing agent is added into the acidic copper-containing waste liquid to enable cupric ions to be converted to bivalence, so that a mother liquid is obtained, and the concentration of cuprous ions in the mother liquid is smaller than or equal to 0.5g/L; a part of copper in the solution is separated from the mother liquid in a mode of a cupric compound crystal substance to obtain a separating medium, and the soluble copper volume of the separating medium is released; and the separating medium is subjected to component adjusting and purifying treatment to enable the separating medium to recover to the condition after a copper acidic etching solution is prepared and before the copper acidic etching solution is used, an acidic etching regenerated solution is obtained to be used in a recycling mode.

Description

technical field [0001] The invention belongs to the field of treatment of acidic copper-containing waste liquid, and in particular relates to a treatment method for copper etching waste liquid produced in the production of printed circuit boards with high copper content. Background technique [0002] Printed circuit board (PCB) manufacturing, metal cleaning and surface treatment, inorganic salt production, electroplating, sign making, copper hydrometallurgy and other industries will use copper-containing solutions and / or produce copper-containing waste liquids. The specific copper content is between 0.2-200 g / L, which can be divided into two types: alkaline system and acidic system, as shown in USP3999564 and USP4130454. The former is a copper solution containing ammonia, ammonium salt and chloride ions, which is commonly known as copper Ammonia solution, also known as alkaline etching solution; the latter, such as copper solution containing chloride ions and hydrochloric ac...

Claims

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Application Information

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IPC IPC(8): C02F9/08C23F1/46
Inventor 李德良张闯李乐张云亮
Owner 长沙铂鲨环保设备有限公司
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