Method and system for reclaiming valuable resource in acidic etching waste liquid

Abstract

Provided are system of value resource in acidic corrosion waste fluid and a recycling method. The recycling method of the invention includes the following steps that adding oxidation agent and concentrated sulfuric acid into the corrosion waste fluid, pre-heating and heating the corrosion waste fluid, evaporating out water vapor and hydrogen chloride under negative pressure and recycling hydrochloric acid, the residue separates hydric sulphate from blue copperas crystal via centrifugal filtration and recycle hydric sulphate, washing blue copperas crystal by blue copperas crystal solution and absolute ethyl alcohol and recycling blue copperas. The recycling system comprises an oxidation ditch, a dosage bunker, a pre-heater, a heat booster, an evaporation tank, a filter, a cooler, a spraying and absorbing device and the like. The recycling method of the invention increases the recovery rate of metal copper and hydrogen chloride, with both recovery rates more than 99%. The method can employ scheme of batch operation or continuous recycling, which is adapted for industry utilization.

Description

technical field [0001] The invention relates to a recovery method and recovery system for valuable resources in acidic industrial waste water, in particular to a recovery method and recovery system for valuable resources in acidic etching waste liquid. Background technique [0002] Acidic etching waste liquid is a kind of industrial waste water produced in the process of making the inner layer circuit pattern of multilayer printed board, the main component is Cu 2+ 、H + , CuCl, [CuCl 3 ] 2- and [CuCl 4 ] 2- , the copper content is 120-160g / L, and the density is 1.2-1.4g / mL. my country is a big producer of printed boards second only to Japan, and the copper in the form of copper clad laminates consumed has accounted for 30% of the country's total. During the etching process of printed boards, more than 60% to 70% of the copper in the copper-clad laminates is etched and enters the etching solution, thus producing a large amount of high-concentration copper-containing aci...

AI Technical Summary

Problems solved by technology

This method cannot release cuprous ions in the form of complexes, and the recovery rate of copper is low

In addition, the amount of concentrated sulfuric acid added is based on copper ions, and the excess is 5% to 15%. The excess of sulfuric acid is small, and it is difficult to completely replace the hydrogen chloride in the distillation and etching waste liquid.

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