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Process of producing ammonium chloride with waste circuit board etching solution

A technology for etching waste liquid and circuit boards, which is applied in the direction of ammonium halide, flocculation/precipitation water/sewage treatment, neutralization water/sewage treatment, etc., can solve the problems of increasing the processing cost of circuit board etching waste liquid, and achieve simple production methods , high efficiency, realize the effect of recycling

Active Publication Date: 2007-03-21
阮玉根
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] In the above two disposal methods, the ammonium ions and chloride ions in the circuit board etching waste liquid are treated by biochemical and physical chemical methods and generate sludge, which forms two pollutions and increases the processing cost of the circuit board etching waste liquid

Method used

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Effect test

Embodiment 1

[0030] Sodium sulfite was added to acidic and alkaline two kinds of circuit board etching waste liquids to form insoluble substances, and they were stirred and mixed respectively; The concentration of ions is 250g / L, and the insoluble substances are removed to obtain two kinds of clear solutions, acidic and basic. These two kinds of acidic and basic clear solutions are respectively added to the reactor at the same time with a flow controller for neutralization reaction. And the flow rate of the acidic solution is 200L / h, and the flow rate of the alkaline solution is 400L / h, so as to ensure that the pH value of the reaction solution is stable between 4.5 and 5.5 during injection, react at a constant temperature of 80°C, and stir the reaction solution until the copper oxychloride Until the crystals are completely precipitated from the reaction solution; filter to obtain copper oxychloride crystals and A solution, rinse the copper oxychloride crystals with pure water, and dry at a...

Embodiment 2

[0032] Sodium sulfite was added to acidic and alkaline two kinds of circuit board etching waste liquids to form insoluble substances, and they were stirred and mixed respectively; The concentration of ions is 250g / L, and the insoluble substances are removed to obtain two kinds of clear solutions, acidic and basic. These two kinds of acidic and basic clear solutions are respectively added to the reactor at the same time with a flow controller for neutralization reaction. And the flow rate of the acidic solution is 200L / h, and the flow rate of the alkaline solution is 400L / h, so as to ensure that the pH value of the reaction solution is stable between 4.5 and 5.5 during injection, react at a constant temperature of 80°C, and stir the reaction solution until the copper oxychloride Until the crystals are completely precipitated from the reaction solution; filter to obtain copper oxychloride crystals and A solution, rinse the copper oxychloride crystals with pure water, and dry at a...

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Abstract

The process of producing ammonium chloride with waste circuit board etching solution includes the following steps: adding agglomerating reductant into both acid and alkaline waste solution and filtering to obtain clear acid and alkaline solutions; neutralizing the acid and alkaline solutions to obtain copper oxychloride crystal; filtering to obtain separated copper oxychloride crystal and solution A; adding ammonium sulfate solution into solution A to sulfurize to obtain copper sulfide and solution B; regulating the pH value of solution B, negative pressure concentrating, and heating to obtain solution C of Baume degree 40-41; and crystallizing solution C, filtering, dewatering and stoving to obtain ammonium chloride. The process of the present invention has the ammonia resource, acid resource and copper resource utilized in producing ammonium and copper oxychloride.

Description

technical field [0001] The invention relates to a treatment method for circuit board etching waste liquid, in particular to a method for producing ammonium chloride with circuit board etching waste liquid. Background technique [0002] After the existing circuit board etching waste liquid is disposed of and utilizes copper ions, there are two ways to dispose of the remaining mother liquid. [0003] The first is to use the acid and alkali solutions of the circuit board etching waste liquid for neutralization reaction and add liquid caustic soda to generate copper hydroxide mud, and the remaining 0.2 to 0.5% copper ions in the mother liquor are reacted with sodium sulfide to produce copper sulfide precipitation. Then the mother liquor is biochemically treated and discharged up to standard. [0004] The second is to use the acidic etching waste liquid of circuit board etching waste liquid to remove copper ions through iron replacement reaction, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/16C02F1/52C02F1/66C02F1/70
Inventor 阮玉根
Owner 阮玉根
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