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Method for recovery processing of ammonia nitrogen from printed circuit board waste liquid

A printed circuit board, ammonia nitrogen recovery technology, applied in water/sewage treatment, chemical instruments and methods, heating water/sewage treatment, etc., can solve the problems of lack of pertinence and safety applicability, and achieve resource utilization, High efficiency and good processing effect

Active Publication Date: 2009-03-25
深圳市宝安东江环保技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Combining the above existing technologies, at present, for the treatment of high-concentration ammonia-nitrogen wastewater, there are still various disadvantages in both process and equipment, and there is no pertinence for high-concentration ammonia-nitrogen wastewater from printed circuit board waste liquid disposal enterprises. and safety applicability

Method used

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  • Method for recovery processing of ammonia nitrogen from printed circuit board waste liquid
  • Method for recovery processing of ammonia nitrogen from printed circuit board waste liquid
  • Method for recovery processing of ammonia nitrogen from printed circuit board waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] BCC, TBCC crystallization mother liquor MED-TC 5-effect evaporation and ammonium chloride recovery.

[0050] A kind of acidic etching waste liquid derived from circuit board factory A, its phase analysis is shown in Table 1, and a kind of alkaline etching waste liquid derived from circuit board factory B, its phase analysis is shown in Table 2, and neutralized and precipitated Copper is treated to obtain copper ammonia liquid; a kind of copper-containing sludge derived from circuit board factory C, its phase analysis is shown in Table 3, copper is extracted through ammonia water, and copper ammonia liquid is also obtained. Mix the two copper ammonia liquids to further produce BCC and TBCC.

[0051] Phase name HCl CuCl 2 CuCl NaCl NH 4 Cl other additives Content g / l 80 200 15 100 8 5

[0052] Table 1

[0053]

Phase name

NH 3

Cu 2+

Cl -

other additives

[0054] Content g / l 140...

Embodiment 2

[0061] BCC, TBCC crystallization mother liquor MVC+MED-TC two-stage combined process evaporation and ammonium chloride recovery.

[0062] A kind of acidic etching waste liquid derived from circuit board factory D, its phase analysis is shown in Table 4, and a kind of alkaline etching waste liquid derived from circuit board factory E, its phase analysis is shown in Table 5, and neutralized and precipitated Copper treatment to obtain cuproammonia liquid; further production of BCC and TBCC.

[0063] Phase name HCl CuCl 2 CuCl NaCl NH 4 Cl other additives Content g / l 75 198 16 98 10 5

[0064] Table 4

[0065] Phase name NH 3 Cu 2+ Cl - other additives

[0066] Content g / l 136 85 76 0～10

[0067] table 5

[0068] In the process of producing BCC and TBCC, high ammonia nitrogen wastewater containing ammonium chloride is produced, containing 40g / l of ammonia nitrogen, 25mg / l of copper, 50mg / l of nick...

Embodiment 3

[0071] Ammonia is distilled using sub-boiling technology and absorbed with sulfuric acid as the medium.

[0072] Collect the wastewater produced by the F tin stripping process of a circuit board factory, containing Sn107.00g / l, Cu45.75g / l, Pb53.00, Fe27.55g / l. The waste water is neutralized with industrial ammonia water, heavy metal elements such as Sn, Cu, Pb, Fe are precipitated, and after pressure filtration, the precipitate—tin sludge is used as the raw material for the production of sodium stannate. The waste water contains 18.6 g / l of ammonia nitrogen.

[0073] The tin stripping waste water is mixed with the ammonium nitrogen waste water produced by neutralizing the ammonia nitrogen waste water in ammonia water and reclaiming the ammonium chloride split from the BCC and TBCC crystallization mother liquid to obtain waste water with an ammonia nitrogen concentration of 28.5g / l, and use ammonia water and NH 4 Cl to prepare NH with a pH of 10.5-12.0 4 Cl—NH 3 .H 2O buffer...

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Abstract

The invention relates to a method for recycling ammonian in ammonian waste water with high concentration, in particular to a method for recycling ammonian in printed wiring board waste water; crystallization mother liquid containing ammonium chloride with high concentration which is generated from processes such as producing alkaline copper chloride, Alpha crystallization type alkaline copper, blue vitriod and the like by using wiring board etching waster water, firstly is evaporated, concentrated and crystallized by one or two combination in multiple effect evaporation technique of mechanical compression, evaporating and compression with heat so as to recycle most ammonium chloride; secondly, Ph is adjusted and ammonian is evaporated so as to recycle ammonia or ammonium sulphate; ammonian waste water generated from removing tin water from ammonia and recycling tin mud are treated by evaporating ammoniac after directly adjusting Ph; and the residual sewage is further treated in the sewage treatment system. By using the method, both of the removal rates of ammonian waste water for wiring board and the recovery rate of ammonia are more than 99.8 percent; the method has good treatment effect, high efficiency, little amount of steam usage, low running cost, and good popularization and application prospect.

Description

[0001] Technical Field The present invention relates to a method for recycling and treating ammonia nitrogen in high-concentration ammonia nitrogen wastewater, in particular to a method for recycling and treating ammonia nitrogen in printed circuit board waste liquid. technical background [0002] Ammonia nitrogen wastewater is one of the largest pollution sources of water bodies today. Excessive discharge of ammonia nitrogen into the water body will lead to eutrophication of the water body, reducing the ornamental value of the water body, and the oxidized nitrate and nitrite will affect the growth of aquatic organisms and even human health. All countries in the world strictly limit the concentration of ammonia nitrogen in wastewater. The discharge standard currently adopted in my country is the "Comprehensive Discharge Standard for Wastewater" GB8978-1996. This standard divides the discharge standard of ammonia nitrogen into two levels according to the difference of wastewater...

Claims

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Application Information

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IPC IPC(8): C01G3/05C01C1/16C01C1/02C02F9/04C02F1/58C02F1/04C02F1/28C05F7/00
CPCY02A40/20
Inventor 刘富强王治军朱兆华胡春林刁伟华陈曙生
Owner 深圳市宝安东江环保技术有限公司
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