Recovery processing device for tin stripping waste liquid

Abstract

The utility model relates to a tin stripping waste liquid recovery processing device which comprises a sedimentation tank, the sedimentation tank is connected with a new tin stripping liquid regeneration kettle through an oxidation tank, a centrifugal machine, a buffer tank, a multi-effect evaporator and a condenser in sequence, the centrifugal machine is further connected with a filter through a pyrolysis tank and washing equipment in sequence, and the filter is respectively connected with a dryer and a first post-processing tank. And the first post-treatment tank is also respectively connected with a second post-treatment tank and the multi-effect evaporator, and the second post-treatment tank is connected with an inlet of the new tin stripping liquid regeneration kettle. According to the recovery treatment device for the tin stripping waste liquid, the tin stripping waste liquid is recycled, dissolved tin elements, iron elements and copper elements are all recovered, maximum utilization of resources is achieved, no other waste is generated in the recovery process, and secondary pollution is eliminated.

Description

TECHNICAL FIELD

[0001] The utility model belongs to wastewater treatment technical field, concretely relates to a kind of recovery treatment device of tin stripping waste liquid. BACKGROUND

[0002] Tin stripping process is an important link in the production of double-sided and multilayer circuit board process, and is a process for removing tin layer on the surface of copper to obtain high-precision line width and spacing.Tin stripping water widely used at present is a kind of nitric acid type liquid with additives such as ferric nitrate, nitric acid stabilizer and copper protective agent.When the tin content in tin stripping water reaches a certain concentration, the tin stripping ability decreases, and tin stripping waste liquid is discharged from the tin stripping equipment.Every year, the amount of tin stripping waste liquid in China reaches several million tons, and if it is directly discharged into the natural environment, the pollution is very serious.At the same time, because tin stripping waste liquid contains tin (more than 100g / L), copper, iron (20~30g / L), part of residual nitric acid and a small amount of polymer surfactant, the metal resources in tin stripping waste liquid are directly lost.

[0003] At present, there are many methods for treating tin stripping waste liquid.Chinese patent CN 203229572U discloses a system for recovering tin from tin stripping waste liquid and recycling new tin stripping water, which controls the pump to pump tin stripping liquid from the tin stripping waste liquid barrel to the reaction tank through the electrical control system, the reaction tank is provided with a steam pipeline, and the steam enters the reaction tank through the steam pipeline to warm the tin stripping liquid, so that the tin compound is fully precipitated, and the volatilized nitric acid vapor is recovered into the liquid preparation barrel through the adsorption and desorption, the centrifuge centrifugation separates the tin-containing precipitate into tin dioxide and clear liquid, and the clear liquid is transported to the liquid preparation barrel, and the liquid preparation barrel is supplemented with nitric acid, infiltration accelerator additive, copper protective additive and stable precipitation inhibitor, and the prepared tin stripping regenerated liquid is transported to the storage barrel.The clear liquid separated from the centrifugation is directly transported to the liquid preparation barrel, and the clear liquid still contains copper ions, iron ions, a small amount of polymer and other impurities, which will inevitably affect the performance of the regenerated liquid, and the separated tin dioxide cannot be directly used without any treatment.

[0004] Chinese patent 201110190600.5 discloses a recovery system and recovery process for recovering sodium nitrate from tin-containing waste liquid treatment tail water, which includes a wastewater storage pool, a purification and refining device, a multi-effect evaporator, a filter, a crystallization device, a centrifuge and a dryer, and the tin-containing waste liquid is sequentially purified and refined by the purification and refining device, evaporated by the multi-effect evaporator, filtered by the filter, crystallized by the crystallization device, centrifugally separated by the centrifuge, and dried by the dryer to generate sodium nitrate semi-finished product.In this recovery system, secondary pollution is generated in the filtering process of the filter, and only the nitric acid in the tin-containing waste liquid is recovered, and the tin, copper, iron and other substances in the tin stripping waste liquid are still in the waste liquid, and the metal resources are not recovered, so the resources are not maximally utilized. SUMMARY

[0005] The utility model discloses a kind of recycling treatment devices of tin stripping waste liquid, realize tin stripping waste liquid recycling, and dissolved tin element, iron element, copper element are all recycled, maximum utilization of resources is realized, no other waste is generated in recycling process, eliminate secondary pollution.

[0006] The utility model discloses a kind of recycling treatment devices of tin stripping waste liquid, the technical scheme that the above problems are solved as follows: recycling treatment device includes sedimentation tank, the sedimentation tank is connected tin stripping new liquid regenerator in turn through oxidation tank, centrifuge, buffer tank, multiple-effect evaporator, condenser, the centrifuge is also connected filter in turn through pyrolysis tank, washing equipment, the filter is connected respectively with drier and first post-treatment tank, the first post-treatment tank is also connected respectively with second post-treatment tank, the multiple-effect evaporator, the second post-treatment tank is connected the tin stripping new liquid regenerator import.

[0007] Preferably, the multiple-effect evaporator is a three-effect evaporator, comprising a first evaporator, a second evaporator and a third evaporator connected in series.

[0008] More preferably, the first evaporator, the second evaporator and the third evaporator are respectively provided with an air inlet, an air outlet, a liquid inlet and a liquid outlet; the air outlet of the upper-stage evaporator is in communication with the air inlet of the lower-stage evaporator, and the liquid outlet of the upper-stage evaporator is in communication with the liquid inlet of the lower-stage evaporator; the air inlet of the first evaporator is connected with a steam device.

[0009] Preferably, the oxidation tank, the tin stripping new liquid regenerator, the first post-treatment tank and the second post-treatment tank are respectively provided with a feeding port.

[0010] Preferably, the second post-treatment tank is further connected with an iron oxide preparation section.

[0011] Compared with the prior art, the utility model has the advantages that:

[0012] (1) The recycling treatment device of tin stripping waste liquid provided by the utility model enables tin stripping waste liquid to be recycled and reused, realizes the recycling of resources, and recycles all dissolved tin elements, iron elements and copper elements, thereby maximizing the use of resources.

[0013] (2) Tin stripping liquid is sequentially passed through the oxidation tank, the centrifuge, the pyrolysis tank, the filter and the drier of the utility model to recycle all elements in the tin stripping liquid into high-purity tin products (tin dioxide), and no other waste is generated during the recycling process.

[0014] (3) the utility model discloses a multi -effect evaporator, filter all with first post -treatment groove is connected, condenser, second post -treatment groove all with the tin removal new liquid regeneration kettle is connected, therefore realizes the filtrate after filtering and the concentrated solution that the discharge after the circulation evaporation of multi -effect evaporator is combined processing, and the upper clear liquid after the treatment of second post -treatment groove and the acid regenerant after the condensation of condenser are combined as raw material preparation tin removal liquid, effectively utilize the various materials generated in the tin removal waste liquid treatment process, not only eliminate secondary pollution, also realize the reuse of resources, can realize the continuous production simultaneously. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the structure schematic diagram of the recovery treatment device of tin removal waste liquid in the embodiment of the utility model.

[0016] Wherein: 1 is the sedimentation tank, 2 is the oxidation tank, 3 is the centrifuge, 4 is the buffer tank, 5 is the multi -effect evaporator, 5-1 is the first evaporator, 5-2 is the second evaporator, 5-3 is the third evaporator, 6 is the condenser, 7 is the tin removal new liquid regeneration kettle, 8 is the pyrolysis tank, 9 is the scrubber equipment, 10 is the filter, 11 is the dryer, 12 is the first post -treatment groove, 13 is the second post -treatment groove. DETAILED DESCRIPTION

[0017] The utility model is further described in detail in connection with the drawings embodiment.

[0018] As Figure 1 Shown, it is the structure schematic diagram of the recovery treatment device of tin removal waste liquid in the embodiment.

[0019] A recovery treatment device of tin removal waste liquid, the recovery treatment device includes sedimentation tank 1, the sedimentation tank 1 is connected tin removal new liquid regeneration kettle 7 in oxidation tank 2, centrifuge 3, buffer tank 4, multi -effect evaporator 5, condenser 6 in sequence;Wherein, multi -effect evaporator 5 is three -effect evaporator, including first evaporator 5-1, second evaporator 5-2 and third evaporator 5-3 in sequence connection;First evaporator 5-1 gas inlet is connected with steam device, first evaporator 5-1 gas outlet is connected with second evaporator 5-2 gas inlet, second evaporator 5-2 gas outlet is connected third evaporator 5-3 gas inlet, and third evaporator 5-3 gas outlet is connected with condenser 5;First evaporator 5-1 liquid inlet is connected with buffer tank 4, first evaporator 5-1 liquid outlet is connected with second evaporator 5-2 liquid inlet, second evaporator 5-2 liquid outlet is connected third evaporator 4-3 liquid inlet, and third evaporator 5-3 liquid outlet is connected with first post -treatment groove 12.

[0020] The centrifuge 3 is further connected with the filter 10 through the pyrolysis tank 8 and the washing device 9 in sequence, the filter 10 is connected with the dryer 11 and the first post-treatment tank 12 respectively, the first post-treatment tank 12 is further connected with the second post-treatment tank 13, the second post-treatment tank 13 is connected with the inlet of the fresh stripping solution regeneration kettle 7, and the second post-treatment tank 13 is further connected with the iron oxide preparation section.

[0021] In addition, the feeding inlets are arranged in the oxidation tank 2, the fresh stripping solution regeneration kettle 7, the first post-treatment tank 12 and the second post-treatment tank 13 respectively.

[0022] The working process of the embodiment will be described in detail below with reference to the drawings:

[0023] Firstly, the collected stripping waste solution is transported to the sedimentation tank 1 to remove the solid impurities such as mud, solid particles and the like in the stripping waste solution by precipitation, and then transported to the oxidation tank 2, hydrogen peroxide is added through the feeding inlet, and under the action of air, the dimethyl tin in the stripping waste solution is oxidized into tetravalent tin to form metatungstic acid precipitate (Sn(H2O)2•(OH)4), and then enters the centrifuge 3 for separation, the obtained clear liquid enters the buffer tank 4, and the obtained precipitate enters the pyrolysis tank 8.

[0024] The clear liquid in the buffer tank 4 enters the multi-effect evaporator 5, the clear liquid of the buffer tank 4 enters the multi-effect evaporator through the liquid inlet of the first evaporator 5-1, the steam in the steam device enters through the gas inlet of the first evaporator 5-1, and after circulating evaporation through the multi-effect evaporator 5, the concentrated solution containing copper ions and iron ions is discharged through the liquid outlet of the multi-effect evaporator 5 (i.e. the liquid outlet of the third evaporator 5-3) and enters the first post-treatment tank 12, the volatilized nitric acid and water vapor enter the condenser 6 from the multi-effect evaporator 5 (i.e. the gas outlet of the third evaporator 5-3) to obtain the acid regeneration solution, and the acid regeneration solution is transported to the fresh stripping solution regeneration kettle 7 to prepare the stripping solution.

[0025] The precipitate entering the pyrolysis tank 8 is prepared into tin dioxide crude product by hydrothermal method in the pyrolysis tank 8, and the tin dioxide crude product is washed by the washing device 9, filtered by the filter 10, dried by the dryer 11 to obtain tin dioxide finished product, which can be used as a sales product. The filtrate filtered by the filter 10 is transported to the first post-treatment tank 12, so that the filtrate and the concentrated solution discharged after circulating evaporation through the multi-effect evaporator 5 are combined and treated, iron filings are added through the feeding inlet of the first post-treatment tank 12 to obtain a solution containing copper and iron ions (divalent), the solution containing iron ions (divalent) enters the second post-treatment tank 13, and the alkali solution is added through the feeding inlet of the second post-treatment tank 13 to obtain a precipitate, which is then sent to the iron oxide preparation section to prepare iron oxide. In addition, the upper clear liquid of the second post-treatment tank 13 can also be sent to the fresh stripping solution regeneration kettle 7 to be combined with the acid regeneration solution, and additives such as ferric nitrate and precipitation inhibitor are added to prepare the regenerated stripping solution.

[0026] In addition to the above embodiments, the utility model also includes other implementation manners, and the technical scheme formed by using equivalent transformation or equivalent replacement should fall within the protection scope of the utility model claims.

Claims

1. A device for the recovery treatment of spent tin stripping solutions, characterized in that it comprises: The recovery treatment device comprises a sedimentation tank (1) connected with a tin stripping new solution regeneration kettle (7) in sequence through an oxidation tank (2), a centrifuge (3), a buffer tank (4), a multi-effect evaporator (5), and a condenser (6); the centrifuge (3) is further connected with a filter (10) in sequence through a pyrolysis tank (8) and a washing device (9); the filter (10) is connected with a dryer (11) and a first post-treatment tank (12) respectively; the first post-treatment tank (12) is further connected with a second post-treatment tank (13) and the multi-effect evaporator (5) respectively; and the second post-treatment tank (13) is connected with the inlet of the tin stripping new solution regeneration kettle (7).

2. The apparatus for recovery treatment of stiπng waste solution according to claim 1, characterized by: The multi-effect evaporator (5) is a three-effect evaporator comprising a first evaporator (5-1), a second evaporator (5-2), and a third evaporator (5-3) connected in sequence.

3. The apparatus for recovery treatment of tin stripping waste liquid according to claim 2, characterized in that: The first evaporator (5-1), the second evaporator (5-2), and the third evaporator (5-3) are respectively provided with an air inlet, an air outlet, a liquid inlet, and a liquid outlet; the air outlet of an upper-stage evaporator is communicated with the air inlet of a lower-stage evaporator, and the liquid outlet of the upper-stage evaporator is communicated with the liquid inlet of the lower-stage evaporator; and the air inlet of the first evaporator (5-1) is connected with a steam device.

4. The apparatus for recovery treatment of stiπng waste solution according to claim 1, characterized by: The oxidation tank (2), the tin stripping new solution regeneration kettle (7), the first post-treatment tank (12), and the second post-treatment tank (13) are respectively provided with a feeding inlet.

5. The apparatus for recovery treatment of stiπng waste solution according to claim 1, characterized by: The second post-treatment tank (13) is further connected with an iron oxide preparation section.

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