Classification recovery system and method for spent tin stripping solution

A recovery system and recovery method technology, applied in chemical instruments and methods, metallurgical wastewater treatment, water/sludge/sewage treatment, etc., can solve the problems of low filtration efficiency, small filter hole gap, etc., and achieve simple and compact structure and work. High efficiency and cost saving effect

Inactive Publication Date: 2016-01-20
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because stannic acid precipitation or stannic acid flocs are formed by the aggregation of stannic acid colloidal particles, the filter pores are very small, and it is difficult to make the filtrate pass through the filter cake layer of ultra-small particles through a single centrifugation or press filtration, and the filtration efficiency is low.

Method used

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  • Classification recovery system and method for spent tin stripping solution

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Effect test

Embodiment 1

[0044] Such as figure 1 As shown, a classification recovery system for tin stripping waste liquid in the present invention includes a suction filtration system 400 , an aging filter 100 , a constant temperature distiller 200 and a cooling collection tank 300 .

[0045] The aging filter 100 is provided with an aging filter chamber 101, a porous centrifuge tank 102, a filter bag 103, a heater 105 and a centrifugal drive device. The centrifugal drive device is made up of a motor 106 and a centrifugal fixed shaft 104. The bottom of the centrifuge tank 102 is fixed, and the motor 106 drives the centrifugal fixed shaft 104 to rotate. The filter bag 103 is disposed in the porous centrifuge tank 102 . The main body of the aging filter 100 is the aging filter chamber 101. The motor 106 at the bottom and the centrifugal fixed shaft 104 drive the porous centrifugal tank 102 and the filter bag 103 assembled by the aging filter 101. The upper end of the aging filter chamber 101 is connec...

Embodiment 2

[0060] The main technical solution of this embodiment is basically the same as that of Embodiment 1, and the features not explained in this embodiment are explained in Embodiment 1, and will not be repeated here. A sorting recovery method of a kind of tin stripping waste liquid of the present embodiment is as follows:

[0061] Open the valve 402, and the tin stripping wastewater flows into the pipeline at a rate of 2L / min (total tin content 120.5g / L, Cu 2+ The concentration is 18.4g / L), after 3 minutes, open the valve 403 at the same time, inject the PMA dilute solution (flocculant) with a concentration of 1% at a rate of 15mL / min, after a period of time, the liquid surface covers the bottom of the aging filter to form After sealing the liquid level, turn on the heater 105 in the aging filter 100, set the constant temperature to 50°C, and let it stand for 1 hour; close the valve 405, open the valve 404, start the vacuum mode, and start the motor 106 at the same time to perform...

Embodiment 3

[0064] The main technical solutions of this embodiment are basically the same as those of Embodiment 1 or 2, and the features not explained in this embodiment are explained in Embodiment 1 or 2, and will not be repeated here. A sorting recovery method of a kind of tin stripping waste liquid of the present embodiment is as follows:

[0065] Open the valve 402, and flow into the pipeline at a speed of 5L / min to remove tin wastewater (total tin content 94.6g / L, Cu 2+ The concentration is 15.7g / L), after 5 minutes, open the valve 403 at the same time, and inject the cationic polyacrylamide dilute solution with a concentration of 5% at a rate of 5mL / min. After a period of time, the liquid surface covers the bottom of the aging filter 100 to form After sealing the liquid surface, turn on the heater 105 in the aging filter 100, set the constant temperature to 80°C, and let it stand for 1 hour; close the valve 405, open the valve 404, start the vacuum mode, and start the motor 106 at ...

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Abstract

The invention discloses a classification recovery system for a spent tin stripping solution. The classification recovery system comprises a suction filtration system, an aging filter, a constant-temperature distillator and a cooling and collecting tank, wherein stannic acid, nitrate and nitric acid are separated step by step through integrating aging and flocculation, centrifugal suction filtration, reduced-pressure distillation and separation as well as cooling and collection, and the decompressing efficiency is increased by sufficiently utilizing the decompressing effect of a decompressing device in the multistage recovering stage; and the separating efficiency of stannic acid sediments is increased by using a centrifugal and low-pressure suction filtration as well as aging and flocculation integrated device / system. Compared with the prior art, the classification recovery system has the following main advantages that (1) the spent tin stripping solution is not needed to be neutralized by using a great deal of alkali, and only a small deal of a flocculant is needed to be added, so that the cost is reduced; (2) continuous treatment is realized by using a set of system, so that the work efficiency is high; (3) stannic acid, nitrate and dilute nitric acid are recovered step by step in a classification way, so that zero discharge of waste water, waste gases and waste residues is realized, and relatively high environmental and economic values are created; and (4) the system is simple and compact in structure, artful in arrangement, good in separation effect and low in equipment price.

Description

technical field [0001] The invention relates to the technical field of recycling tin stripping waste liquid, in particular to a classification recovery system for tin stripping waste liquid and a method for recycling tin stripping waste liquid. Background technique [0002] In the PCB (Printed Circuit Board, Chinese name is printed circuit board, also known as printed circuit board) manufacturing process, the subtractive method still plays a leading role in the transfer of PCB graphics, and the circuit board needs to go through the graphics electroplating process before the outer positive film is etched. Thicken the copper thickness of the pattern and then plate a layer of 5-10μm thick tin layer. Therefore, the tin layer on the pattern needs to be removed after the positive film is etched. The existing domestic tin stripping technology is mainly based on the nitrate system potion, using strong oxidizing nitric acid and metallic Fe 3+ Catalyst bite metal tin, and add sulfona...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C23F1/46C02F103/16
Inventor 潘湛昌范红胡光辉肖楚民
Owner GUANGDONG UNIV OF TECH
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