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Regeneration system and method of solder stripping waste water

A waste liquid and tin stripping technology, which is applied in the direction of improving process efficiency, can solve the problems of high copper-containing impurities and low added value of tin, and achieve the effects of reducing impurity content, simplifying recovery and treatment, and improving recovery purity

Active Publication Date: 2020-07-17
遂宁市瑞思科环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chinese patent CN108383278B is a treatment method for tin stripping waste liquid, adding precipitant, flocculant and sedimentation aid to the tin stripping waste liquid, so that the tin in the tin stripping waste liquid reacts with the precipitant to form a precipitate, and obtains a solid-liquid mixture ; The solid-liquid mixture is subjected to solid-liquid separation to obtain the first filtrate and the first filter residue, and the first filter residue is recovered to obtain tin salt; the patent adds precipitant, flocculant and sedimentation aid to the waste liquid at the same time to make tin and copper At the same time, it precipitates to obtain tin slag with a relatively high amount of copper impurities, which makes the added value of tin lower

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  • Regeneration system and method of solder stripping waste water
  • Regeneration system and method of solder stripping waste water
  • Regeneration system and method of solder stripping waste water

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Embodiment 1

[0043] This embodiment provides a high-efficiency filter assembly. The high-efficiency filter assembly includes a plurality of filter devices 3, and the plurality of filter devices 3 are connected in series or in parallel through pipelines, which can be increased or decreased according to the amount of waste liquid. The filtration capacity is greatly improved; the filter layer 4 in the filter device 3 has a filter aperture of 1-200nm, which can filter ultrafine particles such as β-stannic acid; the turbid liquid filtered by the filter device 3 can be circulated and filtered again, so that The liquid is clearer and not cloudy. When the present invention filters the pretreated β stannic acid in the waste liquid, the waste liquid in the waste liquid tank 1 passes through the feed high-pressure pump 2, and after filtering through the filter device 3, turbid liquid and clear liquid are respectively obtained; turbid The liquid returns to the waste liquid tank 1 through the original ...

Embodiment 2

[0045] The content / concentration of each component of the tin stripping waste liquid used in this embodiment is as follows: the content of tin is 100g / L, the content of copper ions is 6g / L, the content of iron ions is 16g / L, and the residual nitric acid is 25%.

[0046] A method for regenerating tin stripping waste liquid, comprising the following steps: adding nitric acid to the tin stripping waste liquid, simultaneously aerating for 1 hour and standing for heat preservation at 30°C, so that the alpha stannic acid in the waste liquid is completely converted into beta stannic acid; Then add hydrochloric acid and sulfonate to the waste liquid, heat it to 30-40°C, keep it warm, and let it stand for 8 hours; make the β-stannic acid in the waste liquid coagulate; use high-efficiency filter components to filter the precipitated β-stannic acid , the recovery rate of tin is 95.9%, and the impurity content is 1.4%; Then add oxalic acid, make the precipitation of a small amount of coppe...

Embodiment 3

[0050] The content / concentration of each component of the tin stripping waste liquid used in this embodiment is as follows: the tin content reaches more than 110g / L, the copper ion content is 8g / L, the iron ion content is 17g / L, and the residual nitric acid content is 24%.

[0051] A regeneration method for tin stripping waste liquid, comprising the following steps: introducing ozone into the tin stripping waste liquid, simultaneously aerating for 1.5 hours and standing for heat preservation at 35°C, so that the α-stannic acid in the waste liquid is completely converted into β-tin acid; then add sulfuric acid and fatty acid salt to the waste liquid, heat to 35°C at the same time, keep it warm, and let it stand for 9 hours to make the β-stannic acid in the waste liquid coagulate; use high-efficiency filter components to filter the β-stannic acid precipitate , the recovery rate of tin is 96.3%, and the impurity content is 1.2%; Then add oxalic acid, make the precipitation of a sm...

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Abstract

The invention relates to the field of production waste treatment in printed circuit manufacturing, and discloses a regeneration method of solder stripping waste water. The regeneration method comprises the following steps of completely converting alpha stannic acid into beta stannic acid; coagulating the beta stannic acid; filtering the beta stannic acid; precipitating copper from the filtrate; carrying out solid-liquid separation; and regenerating clarified liquid; wherein the regeneration system comprises a waste liquid storage tank, a first reaction tank, a precipitation tank, an efficientfiltering assembly, a second reaction tank, a filtering device and a regeneration liquid storage tank which are sequentially connected. According to the method, firstly, the solder stripping waste water is innovatively pretreated to convert alpha stannic acid into beta stannic acid, then the beta stannic acid is subjected to coagulation, filtration, filtrate re-copper deposition, filtration and sub-liquid regeneration, and copper and tin are separated step by step, so that the use amount of a copper deposition agent is reduced, the treatment cost is reduced, meanwhile, an alkaline solution isnot required to be used in the treatment process, the raw material cost of the regeneration treatment process of the solder stripping waste water is greatly reduced, the treatment process is simplified, meanwhile, the recovery purity of copper and tin products is improved, and the profit of the recovered products is improved.

Description

technical field [0001] The invention relates to the technical field of production waste treatment in the manufacture of printed circuits, in particular to a regeneration system and method for tin stripping waste liquid. Background technique [0002] Tin stripping waste liquid is one of the typical wastes in the PCB industry. There are two main sources of it: one is the tin stripping waste liquid produced in the printed circuit board stripping process, and the other is the wet treatment of waste circuit boards for components. The tin stripping waste liquid produced by stripping tin when it is separated from the substrate. Tin stripping refers to the use of tin stripping solution to dissolve and remove the tin coating on the workpiece. During the tin stripping process, when the tin content of the solution reaches a certain concentration (usually higher than 100g / L), the tin stripping ability decreases. It is discharged into the tin stripping waste liquid. Tin stripping waste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/46C22B7/00C22B15/00C22B25/06
CPCC23F1/46C22B7/006C22B15/0091C22B25/06C22B25/04Y02P10/20
Inventor 邹毅芳宋传京陈海平叶自洁高阔汪国容王文平汪强
Owner 遂宁市瑞思科环保科技有限公司
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