Low-emission nickel-containing waste liquid treatment system

Abstract

The utility model belongs to the technical field of waste liquid treatment, and relates to a low-emission nickel-containing waste liquid treatment system which comprises a nickel melting tank, a liquid conveying pump, a transfer barrel, an evaporation kettle, a condenser and a condensation tank which are sequentially and circularly connected through pipelines, the liquid conveying pump pumps nickel-containing waste liquid to the evaporation kettle from the bottom of the nickel melting tank, and the condenser is higher than the evaporation kettle and the condensation tank. The nickel melting tank is lower than the evaporation kettle, a blow-off pipe is arranged at the bottom of the evaporation kettle, the top of the condensation tank is connected with a vacuum generator, an inlet valve is arranged at an inlet of the evaporation kettle, and an outlet valve is arranged at an outlet of the condensation tank. According to the system, other treatment solvents are not used, but a solid part is integrally converted into sludge to be separated from the solution, so that the amount of the integrally treated wastewater is very low, most nickel and phosphorus are left in the sludge and can be conveniently collected and treated, and the treatment cost is lower.

Description

Technical Field

[0001] The utility model relates to the technical field of waste liquid treatment, in particular to a low-emission nickel-containing waste liquid treatment system. Background Art

[0002] Electroless Nickel / Immersion Gold, abbreviated as ENIG, also known as electroless nickel gold, immersion nickel gold or electroless nickel gold, is a process that replaces palladium on the surface of copper through chemical reaction, then chemically plates a nickel-phosphorus alloy layer on the palladium core, and then plates a layer of gold on the surface of nickel through replacement reaction. Its purpose is to prevent the copper on the surface of the circuit board from being oxidized or corroded. Nickel is a heavy metal, and the concentration of nickel in waste liquid is generally required to be within 0.1 mg / L, so nickel needs to be collected and recycled.

[0003] Chinese patent CN104086022A discloses a method for treating nickel-containing wastewater, in which an alkaline substance is used to convert nickel into nickel hydroxide precipitation. Nickel and phosphorus coexist in the solution. Although nickel can be removed by precipitation, it is not easy to stably reach a nickel content below the limit of 0.1 mg / L. In addition, a large amount of phosphorus will also exist in the waste liquid in the form of ions (greater than 10,000 mg / L), and the phosphorus discharge concentration is required to be within 3 mg / L. Therefore, this treatment method cannot make the waste liquid meet the discharge requirements immediately, and it must be discharged to the wastewater station for mixing treatment, resulting in an increase in the overall phosphorus content of the wastewater station and an increase in the risk of excessive phosphorus discharge.

[0004] Therefore, it is necessary to design a new treatment system to complete the recycling with low emissions. Summary of the invention

[0005] The main purpose of the utility model is to provide a low-emission nickel-containing waste liquid treatment system, which can avoid damage to the thin plate during the electroplating process, while providing a new conduction position and ensuring the electroplating quality.

[0006] The utility model achieves the above-mentioned purpose through the following technical scheme: a low-emission nickel-containing waste liquid treatment system, comprising a nickel-containing tank, an infusion pump, a transfer barrel, an evaporating kettle, a condenser and a condensing tank which are sequentially connected through pipelines, the infusion pump pumps the nickel-containing waste liquid from the bottom of the nickel-containing tank to the evaporating kettle, the condenser is higher than the evaporating kettle, the nickel-containing tank is lower than the evaporating kettle and the condensing tank, the lower outlet of the condensing tank is connected to the nickel-containing tank, the bottom of the evaporating kettle is provided with a sewage pipe, the top of the condensing tank is connected to a vacuum generator, the inlet of the evaporating kettle is provided with an inlet valve, and the outlet of the condensing tank is provided with an outlet valve.

[0007] Specifically, the nickel-plating tank includes a reaction tank and a cleaning tank arranged front and back along the conveying direction of the production line, the outlet of the condensing tank is connected to the inlet of the cleaning tank, and the condensing tank is higher than the cleaning tank.

[0008] Furthermore, the outlet valve is a three-way valve, the inlet of which is connected to the bottom of the condensation tank, one outlet is emptied, and the other outlet is connected to the inlet of the cleaning tank.

[0009] Specifically, a meandering steam pipe is provided in the evaporating kettle, and the meandering steam pipe is isolated from the inner cavity of the evaporating kettle.

[0010] Specifically, the vacuum generator is a water ring vacuum generator, including a circulating water tank, a vacuum pump and a vacuum pipe located at the outlet of the vacuum pump, the outlet of the vacuum pipe returns to the top of the circulating water tank, and the branch on the vacuum pipe is connected to the upper part of the condensation tank.

[0011] The beneficial effects of the technical solution of the utility model are:

[0012] This system can pump nickel-containing waste liquid into the transfer barrel, and under the low pressure of the vacuum generator, the nickel-containing waste liquid is sucked into the evaporator for heating and concentration, and is divided into sludge and evaporation. The sludge is separated, and the evaporation is condensed into liquid through the condenser and falls into the condensation tank, and then reused as the solvent of the nickel tank. This system does not use other processing solvents, but converts the solid part into sludge as a whole and separates it from the solution. After evaporation and condensation, the solution returns to a state of low impurity concentration and directly meets the emission standards. Part of it is discharged, and the other part can be reused as a solvent. Therefore, the amount of wastewater treated is very low, and most of the nickel and phosphorus remain in the sludge, which can be easily collected and treated. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the piping diagram of the nickel-containing waste liquid treatment system.

[0014] The markings in the figure are:

[0015] 1-nickelization tank, 11-reaction tank, 12-cleaning tank;

[0016] 2- Infusion pump;

[0017] 3- Transfer barrel;

[0018] 4-evaporation kettle, 41-drain pipe;

[0019] 5-Condenser;

[0020] 6- condensation tank;

[0021] 7- Vacuum generator;

[0022] 8a - inlet valve, 8b - outlet valve. DETAILED DESCRIPTION

[0023] The utility model is further described in detail below in conjunction with specific embodiments.

[0024] Example:

[0025] like Figure 1 As shown, a low-emission nickel-containing waste liquid treatment system of the utility model comprises a nickel-containing tank 1, an infusion pump 2, a transfer barrel 3, an evaporating kettle 4, a condenser 5 and a condensing tank 6 which are sequentially connected by pipelines, the infusion pump 2 pumps the nickel-containing waste liquid from the bottom of the nickel-containing tank 1 to the transfer barrel 3, the condenser 5 is higher than the evaporating kettle 4 and the condensing tank 6, the nickel-containing tank 1 is lower than the evaporating kettle 4, the lower outlet of the condensing tank 6 is connected to the nickel-containing tank 1, the bottom of the evaporating kettle 4 is provided with a sewage pipe 41, the top of the condensing tank 6 is connected to the vacuum generator 7, the inlet of the evaporating kettle 4 is provided with an inlet valve 8a, and the outlet of the condensing tank 6 is provided with an outlet valve 8b.

[0026] The nickel-containing waste liquid produced by the reaction in the nickel-containing tank 1 is first pumped into the transfer barrel 3 by the infusion pump 2 for processing. At this time, nickel and phosphorus exist in the waste liquid in a large amount in an ionic state. When the inlet valve 8a and the outlet valve 8b are closed, a closed environment is formed in the system. Under the action of the vacuum generator 7, the outlet from the transfer barrel 3 to the upper mouth of the condenser 6 is in the same vacuum state (pressure is controlled at 0.02MPa). At this time, the boiling temperature of the nickel-containing waste liquid is reduced to 60°C, so when the water vapor temperature is higher, the solvent of the nickel-containing waste liquid will boil, and the solid part is converted into sludge as a whole and separated from the solution. The solvent returns to a state of low impurity concentration after evaporation and condensation, and directly reaches the emission standard, so the wastewater volume of the entire treatment is very low, and most of the nickel and phosphorus are left in the sludge, which can be easily collected and processed, and the processing cost is lower.

[0027] like Figure 1 As shown, the nickel-plating tank 1 includes a reaction tank 11 and a cleaning tank 12 arranged front and back along the conveying direction of the production line. The outlet of the condensation tank 6 is connected to the inlet of the cleaning tank 12, and the condensation tank 6 is higher than the cleaning tank 12.

[0028] In the production line, the circuit board first passes through the reaction tank 11 and then passes through the cleaning tank 12. The nickel-gold reaction occurs in the reaction tank 11. The liquid in the condenser 6 on the surface of the circuit board in the cleaning tank 12 is water with fewer impurities obtained after evaporation, so it can be used directly for cleaning. A small part of the water in the nickel-containing waste liquid will be discharged from the sewage pipe 41 along with the sludge, a major part will be converted into liquid that meets the discharge standards, and the other part will be reused as cleaning liquid. The water in the first and second parts will leave the system, and only the water in the third part circulates in the system, and the water in the third part is originally the water contained in the nickel-containing waste liquid, so it will not cause unnecessary increase in the amount of wastewater.

[0029] like Figure 1 As shown, the outlet valve 8 b is a three-way valve, the inlet of which is connected to the bottom of the condensation tank 6 , one outlet is emptied, and the other outlet is connected to the inlet of the cleaning tank 12 .

[0030] The three-way valve can be switched between closed, empty, and partial reflux states to meet the needs of different states.

[0031] like Figure 1 As shown, a meandering steam pipe 42 is provided in the evaporating kettle 4 , and the meandering steam pipe 42 is isolated from the inner cavity of the evaporating kettle 4 .

[0032] The water vapor (temperature of about 100° C. under atmospheric pressure) only exchanges heat with the nickel-containing waste liquid in the evaporator 4, but not materials, so that the vacuum environment in the system will not be destroyed.

[0033] like Figure 1 As shown, the vacuum generator 7 is a water ring vacuum generator, including a circulating water tank 71, a vacuum pump 72 and a vacuum pipe 73 located at the outlet of the vacuum pump 72, the outlet of the vacuum pipe 73 returns to the top of the circulating water tank 71, and the branch on the vacuum pipe 73 is connected to the upper part of the condensation tank 6.

[0034] Because there is water vapor heating in the system, the condensed gas will have a certain amount of waste heat. If the vacuum pump directly sucks, it is easy to overheat and be damaged. When a water ring vacuum generator is used, the vacuum pump 72 will cause the cooling water to circulate outside the circulating water tank 71. According to the Bernoulli principle, low pressure will be generated at the outlet of the vacuum pump 72, thereby generating suction on the evaporated gas in the system through the branch. The evaporated gas will be mixed with the circulating cooling water and the heat will be absorbed, but when it is ejected from the vacuum pipe 73, the heat will be released to a certain extent, so the water temperature flowing through the vacuum pump 72 again will not be very high, which can better ensure the normal operation of the vacuum pump 72.

[0035] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A low-emission nickel-containing waste liquid treatment system, characterized in that: The invention comprises a nickel-plating tank, an infusion pump, a transfer barrel, an evaporating kettle, a condenser and a condensing tank which are sequentially connected by pipelines. The infusion pump pumps nickel-containing waste liquid from the bottom of the nickel-plating tank to the transfer barrel. The condenser is higher than the evaporating kettle, and the nickel-plating tank is lower than the evaporating kettle. A sewage pipe is provided at the bottom of the evaporating kettle. The top of the condensing tank is connected to a vacuum generator. The inlet of the evaporating kettle is provided with an inlet valve, and the outlet of the condensing tank is provided with an outlet valve.

2. The low-emission nickel-containing waste liquid treatment system according to claim 1, characterized in that: The nickel-plating tank includes a reaction tank and a cleaning tank arranged front and back along the conveying direction of the production line. The outlet of the condensing tank is connected to the inlet of the cleaning tank, and the condensing tank is higher than the cleaning tank.

3. The low-emission nickel-containing waste liquid treatment system according to claim 2, characterized in that: The outlet valve is a three-way valve, the inlet of which is connected to the bottom of the condensation tank, one outlet is emptied, and the other outlet is connected to the inlet of the cleaning tank.

4. The low-emission nickel-containing waste liquid treatment system according to claim 1, characterized in that: A meander-shaped steam pipe is arranged in the evaporating kettle, and the meander-shaped steam pipe is isolated from the inner cavity of the evaporating kettle.

5. The low-emission nickel-containing waste liquid treatment system according to claim 1, characterized in that: The vacuum generator is a water ring vacuum generator, comprising a circulating water tank, a vacuum pump and a vacuum pipe located at the outlet of the vacuum pump, the outlet of the vacuum pipe returns to the top of the circulating water tank, and the branch on the vacuum pipe is connected to the upper part of the condensation tank.

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