Method for recovering hydrochloric acid and copper sulfate from acidic etching liquid

A technology of acid etching liquid and acid etching waste liquid, which is applied in the field of recycling useful resources, can solve problems such as poor economic benefits and environmental protection, and achieve the effects of extensive practical value, quick results, and simple process equipment

Inactive Publication Date: 2006-08-30
苏州天地环境科技有限公司
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Problems solved by technology

[0005] The invention provides a method for recovering hydrochloric acid and copper sulfate from acidic etching solutio

Method used

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  • Method for recovering hydrochloric acid and copper sulfate from acidic etching liquid
  • Method for recovering hydrochloric acid and copper sulfate from acidic etching liquid

Examples

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Comparison scheme
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Embodiment 1

[0051] Embodiment one: a kind of method (laboratory small test) of reclaiming hydrochloric acid and copper sulfate from acid etching solution

[0052] 1. Main reagents and instruments

[0053] 1. Concentrated sulfuric acid 98% AR grade

[0054] 2. 500ml full glass still (500ml distillation bottle, 20cm long serpentine condenser)

[0055] 3. 600W or 800W adjustable electric furnace

[0056] 4. 100ml measuring cylinder

[0057] 5. WFX-130 atomic absorption spectrophotometer, used to measure iron, lead, chloride ion and other impurities

[0058] 6. The distillation device is shown in the figure:

[0059] 2. Recycling operation

[0060] 1. Distillation. Take 100ml of acidic etching solution containing 139g / L copper and about 10% hydrochloric acid and pour it into a full glass retort, then add 14ml concentrated sulfuric acid and a few glass beads to prevent the liquid from bumping. according to figure 2 As shown, install the distillation device and start heating and distilla...

Embodiment 2

[0067] Embodiment two: a kind of method (suitable for industrialized production) of reclaiming hydrochloric acid and copper sulfate from acid etching solution

[0068] 1. Distillation kettle

[0069] Enameled or rigid polyvinyl chloride stills are available. The pipe can be made of graphite pipe. For the convenience of operation, three pipes can be inserted into the distillation kettle, which are respectively used for passing steam, adding concentrated sulfuric acid and adding distilled water.

[0070] 2. Recovery of hydrochloric acid

[0071] Put the acidic etching waste liquid in an acid-resistant distillation pot, then add concentrated sulfuric acid, heat to a slight boiling state, turn on the stirrer to stir, and distill and recover hydrochloric acid at the same time.

[0072] The concentration of concentrated sulfuric acid is 98%. After adding concentrated sulfuric acid to the acidic etching waste liquid, the temperature of the reactor can reach more than 40 degrees in...

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Abstract

This invention is a method of recovering chlorhydric acid and copper sulfate from acid etching solution. The procedures are that (1) recovering chlorhydric acid. The acid etching waste solution is filled in acid resistant distillation plant, then concentrated sulfuric acid is added, then they are heated to boiling state and the chlorhydric acid is recovered through distillation, the concentration of the concentrated sulfuric acid is 98% or more than 98%. The adding on is more than 5-15% than that based on the theoretical value of copper ion fully reacted with sulfuric acid in the distillation. (2) Recovering copper sulfate. First, the residue in chlorhydric acid recovery is watering dissolved to thoroughly decompose the copper sulfate in the residue; the adding quantity of the water is 30-70% volume of acid etching waste solution. Secondly, copper sulfate is seed out through the changing of high temperature to low temperature; the temperature change is controlled between 40 to 60 degrees centigrade. Thirdly, copper sulfate is got after the copper sulfate crystalline is filtrated and washed. The simplest method is used to recover the useful resource in etching waste liquor in this invention. The technique equipment is simple, operation is convenient, and there is no environment pollution, so it has wide using value.

Description

technical field [0001] The invention relates to a method for recovering useful resources from industrial waste liquid, in particular to a method for recovering hydrochloric acid and copper sulfate from acidic etching waste liquid. Background technique [0002] In the past ten years, with the steady growth of the world's electronics industry, China's printed circuit boards have developed rapidly with a growth rate of more than 20%. A large amount of acidic etching waste liquid is produced every year, its main components are copper chloride and hydrochloric acid, the copper content is 130-180g / L, and the hydrochloric acid concentration is about 10%. The treatment of waste liquid not only solves the pollution problem of waste liquid from the perspective of environmental protection, but more importantly, recycles and utilizes limited resources, which has obvious social and economic benefits. [0003] In the past, there have been many methods for the recovery and utilization of ...

Claims

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Application Information

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IPC IPC(8): C23F1/46
Inventor 李金荣陈土根章文华郁宏
Owner 苏州天地环境科技有限公司
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