Method and system for deionized water regeneration based on staged ion exchange

Abstract

The present application relates to the technical field of electronic component manufacturing auxiliary, in particular to a deionized water regeneration method and system based on phased ion exchange, which initially configures a first exchange column, a second exchange column, a third exchange column, a fourth exchange column and a fifth exchange column; water treatment is sequentially performed on each exchange column, and the conductivity of water out of the fifth exchange column is tested; when the conductivity is greater than 10 uS / cm, maintenance treatment is performed on each exchange column; after maintenance, water treatment is performed again on each exchange column, and the flushing pH value and the conductivity are tested until the conductivity is less than or equal to 10 uS / cm, and the deionized water is collected; after initial preparation, only maintenance treatment is required in the subsequent process, and there is no need for complex and expensive replacement; even if there is failed resin, the failed resin can be flushed out through the backflushing of the maintenance treatment, and a small amount of addition and supplement can be performed during the process, so that the deionized water can be recycled and used repeatedly; the chemical reagents used in the maintenance treatment are hydrochloric acid and sodium hydroxide, which are easy to purchase and inexpensive.

Description

Technical Field

[0001] This invention relates to the field of auxiliary technology for electronic component manufacturing, and in particular to a deionized water regeneration method and system based on staged ion exchange. Background Technology

[0002] If tap water, well water, or other common water sources are used for the surface treatment of electronic components, the water source contains a large number of impurity ions, which will inevitably contaminate the surface treatment solution and affect the solderability of electronic components, making their soldering and installation difficult. Therefore, the water used for surface treatment must be purified (i.e., impurities or excess impurity ions in the water are removed).

[0003] The most traditional method for producing deionized water is to use an ion-exchange membrane filtration device, which involves installing an ion-exchange membrane filter at the input end of the water source and directly outputting deionized water. Although this method is convenient and quick, the production and maintenance costs are relatively high. Once the ion-exchange membrane is saturated with anions and cations, it needs to be replaced in a timely manner, with replacement costs ranging from several thousand to tens of thousands of yuan. This makes it not cost-effective and indirectly increases the production cost of the product, making it difficult to promote its use in the context of large-scale surface treatment of electronic components. Summary of the Invention

[0004] The purpose of this invention is to provide a deionized water regeneration method and system based on staged ion exchange, which aims to solve the problem that traditional deionized water methods are costly and difficult to promote and use in large-scale electronic components that require surface treatment.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a deionized water regeneration method based on staged ion exchange, comprising the following steps: The initial configuration includes the first, second, third, fourth, and fifth switching posts. The first, second, third, fourth, and fifth exchange columns were sequentially subjected to water treatment, and the conductivity of the water effluent from the fifth exchange column was tested. When the conductivity is greater than 10 μS / cm, maintenance is performed on the first, second, third, fourth, and fifth exchange columns. The first, second, third, fourth, and fifth exchange columns were treated with water again after maintenance, and the rinsing pH value and conductivity were tested until the conductivity was ≤10uS / cm, and the deionized water was collected.

[0006] The specific method for initially configuring the first, second, third, fourth, and fifth switch posts is as follows: Pour the cleaned blue sand into the first exchange column until the blue sand is level with the bottom of the observation window; Pre-soak the cation exchange resin in hydrochloric acid solution and rinse it until the pH value is 4-5. Then pour the cation exchange resin into the second and fourth exchange columns until the cation exchange resin is flush with the bottom of the upper observation window. Pre-soak the anion resin in sodium hydroxide solution and rinse the cation resin until the pH value is 9-10. Then pour the anion resin into the third and fifth exchange columns until the anion resin is flush with the bottom of the upper observation window.

[0007] The specific method for sequentially treating the water in the first, second, third, fourth, and fifth exchange columns, and testing the conductivity of the water effluent from the fifth exchange column is as follows: Open the inlet valve to maintain a certain flow rate so that the water to be treated enters the first exchange column. When the water level rises to 1 / 2 of the height of the upper observation window, open the connecting valve between the first and second exchange columns to allow the water to be treated to flow into the second exchange column. When the water level rises to half the height of the observation window on the second exchange column, open the valve connecting the second and third exchange columns to allow the water to flow into the third exchange column. When the water level rises to 1 / 2 the height of the observation window on the third exchange column, open the connecting valve between the third and fourth exchange columns to allow the water to flow into the fourth exchange column. When the water level rises to 1 / 2 the height of the observation window on the fourth exchange column, open the connecting valve between the fourth and fifth exchange columns to allow the water to flow into the fifth exchange column. When the water level rises to 1 / 2 the height of the observation window on the fifth exchange column, open the lower valve of the fifth exchange column and control the water flow to keep the water level of the fifth exchange column at 1 / 3 of the height of the upper observation window. Take out the water and test its conductivity. When the conductivity is ≤10uS / cm, close the lower valve of the fifth exchange column and open the outlet valve to collect the deionized water.

[0008] The specific method for maintaining the first, second, third, fourth, and fifth exchange columns when the conductivity is >10 μS / cm is as follows: When the conductivity is >10uS / cm, connect the lower valve port of each exchange column to deionized water or distilled water, open the lower valve and control the inlet water flow rate to backflush into the interior of each exchange column, and let the liquid level of each exchange column drop to the bottom of the upper observation window. Hydrochloric acid solution is pumped into the second and fourth exchange columns and then flows out, causing the liquid level in the second and fourth exchange columns to drop to the bottom of the upper observation window. Sodium hydroxide solution is pumped into the third and fifth exchange columns and then flows out, causing the liquid levels in the third and fifth exchange columns to drop to the bottom of the upper observation window.

[0009] Secondly, the present invention also provides a deionized water regeneration system based on staged ion exchange, which is applied to the deionized water regeneration method based on staged ion exchange as described in the first aspect above, including a first exchange column, a second exchange column, a third exchange column, a fourth exchange column and a fifth exchange column, wherein the first exchange column, the second exchange column, the third exchange column, the fourth exchange column and the fifth exchange column are connected in sequence through a valve group; The first exchange column is used to filter out mud, sand, and pipe impurities from the water; The second exchange column, based on the ion exchange principle of cation exchange resin, adsorbs impurity cations in the water and releases hydrogen ions; The third exchange column, based on the ion exchange principle of anion exchange resin, adsorbs impurity anions in the water and releases hydroxide ions. The fourth exchange column, based on the ion exchange principle of cation exchange resin, adsorbs impurities in water through cation adsorption and releases hydrogen ions. The fifth exchange column, based on the ion exchange principle of anion exchange resin, adsorbs impurity anions in the water and releases hydroxide ions.

[0010] The present invention discloses a deionized water regeneration method based on staged ion exchange. Initially, a first, second, third, fourth, and fifth exchange column are configured. The first, second, third, fourth, and fifth exchange columns are sequentially treated with water, and the conductivity of the effluent from the fifth exchange column is tested. When the conductivity is >10 μS / cm, the first, second, third, fourth, and fifth exchange columns undergo maintenance. After maintenance, the first, second, third, fourth, and fifth exchange columns are treated with water again, and the rinsing pH and conductivity are tested until the conductivity is ≤10 μS / cm. The system collects deionized water at a concentration of S / cm. After initial preparation, only maintenance is required; complex and expensive replacements are unnecessary. Even if there is dead resin, it will be flushed out during maintenance. Only small amounts need to be added during this process, allowing for continuous recycling. The chemicals used in maintenance are hydrochloric acid and sodium hydroxide, which are readily available and inexpensive. For example, a 100L exchange column requires approximately 13.5 liters of 37.5% concentrated hydrochloric acid for a cation exchange column (such as the second or fourth column) and approximately 10 kg of solid sodium hydroxide for an anion exchange column (such as the third or fifth column). Therefore, one maintenance treatment requires approximately 27 liters of concentrated hydrochloric acid and 20 kg of solid sodium hydroxide, costing approximately 1600 yuan. Based on standard tap water quality, one maintenance treatment can produce over 8 cubic meters (approximately 8 tons) of deionized water, with a treatment cost of approximately 200 yuan per cubic meter. The waste liquid generated during maintenance is mainly hydrochloric acid solution and sodium hydroxide solution. The neutralization reaction between them produces sodium chloride, which does not pollute the environment. Regarding the treatment of waste liquid, it can be completely discharged by collecting and then neutralizing it, without the need for additional costs associated with waste liquid treatment. This solves the problem that traditional methods of producing deionized water are costly and difficult to promote and use in large-scale electronic components that require surface treatment. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0012] Figure 1 This is a flowchart of the deionized water regeneration method based on staged ion exchange provided by the present invention.

[0013] Figure 2 This is a flowchart illustrating the specific steps of step S1 in the deionized water regeneration method based on staged ion exchange provided by the present invention.

[0014] Figure 3 This is a flowchart illustrating the specific steps of step S2 in the deionized water regeneration method based on staged ion exchange provided by the present invention.

[0015] Figure 4 This is a flowchart illustrating the specific steps of step S3 in the deionized water regeneration method based on staged ion exchange provided by the present invention.

[0016] Figure 5 This is a connection diagram of the deionized water regeneration device based on staged ion exchange provided by the present invention.

[0017] In the diagram: First exchange post, second exchange post, third exchange post, fourth exchange post, and fifth exchange post. Detailed Implementation

[0018] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0019] Please see Figures 1 to 4 This invention provides a deionized water regeneration method based on staged ion exchange, comprising the following steps: S1 is initially configured with the first, second, third, fourth, and fifth switching posts; In this embodiment of the invention, the inlet and outlet valves of the corresponding exchange columns for the cyanide and anion exchange resin are both closed, the four connecting valves are also closed, all five upper nuts are open, all five lower nuts are closed, all five upper valves are open, and all five lower valves are closed.

[0020] Specific methods: S11 pours the cleaned blue sand into the first exchange column until the blue sand is level with the bottom of the observation window; In this embodiment of the invention, the slag filled into the first exchange column is 30-100 mesh. Before filling, the slag is rinsed with deionized water or distilled water. The cleaned slag is then filled through the open upper nut port. The amount of slag filled is level with the bottom of the upper observation window of the first exchange column. After filling, the upper nut is tightened and the upper valve is closed.

[0021] S12 uses hydrochloric acid solution to pre-soak the cation resin and rinses the cation resin to pH 4-5. Then, the cation resin is poured into the second and fourth exchange columns until the cation resin is flush with the bottom of the upper observation window. In this embodiment of the invention, before the cation exchange resin is poured into the second and fourth exchange columns, it must be soaked in a 4%±1% hydrochloric acid solution for 2 hours, and then rinsed with deionized water or distilled water until the pH value is 4-5. Then it can be poured in through the open upper nut port. The amount of cation exchange resin poured in should be level with the bottom of the upper observation window of the second or fourth exchange column. After the filling is completed, tighten the upper nut and then close the upper valve.

[0022] S13 uses sodium hydroxide solution to pre-soak the anion resin and rinses the cation resin to pH 9-10. Then, the anion resin is poured into the third and fifth exchange columns until the anion resin is flush with the bottom of the upper observation window.

[0023] In this embodiment of the invention, before the anion resin is poured into the third and fifth exchange columns, it must be soaked in a 4%±1% sodium hydroxide solution for 2 hours, and then rinsed with deionized water or distilled water until the pH value is 9-10. Then it can be poured in through the open upper nut port. The amount of anion resin poured in should be flush with the bottom of the upper observation window of the third or fifth exchange column. After the filling is completed, tighten the upper nut and then close the upper valve.

[0024] S2 sequentially treats the water in the first, second, third, fourth, and fifth exchange columns, and tests the conductivity of the water effluent from the fifth exchange column. Specific methods: S21 Open the inlet valve to maintain a certain flow rate of water, allowing the water to be treated to enter the first exchange column. When the water level rises to 1 / 2 of the height of the upper observation window, open the connecting valve between the first and second exchange columns to allow the water to be treated to flow into the second exchange column. S22 When the water level rises to 1 / 2 of the height of the observation window on the second exchange column, open the connecting valve between the second and third exchange columns to allow the water to flow into the third exchange column; S23 When the water to be treated rises to 1 / 2 of the height of the observation window on the third exchange column, open the connecting valve between the third and fourth exchange columns to allow the water to be treated to flow into the fourth exchange column; S24 When the water to be treated rises to 1 / 2 of the height of the observation window on the fourth exchange column, open the connecting valve between the fourth and fifth exchange columns to allow the water to be treated to flow into the fifth exchange column; S25 When the water to be treated rises to 1 / 2 the height of the observation window on the fifth exchange column, open the lower valve of the fifth exchange column and control the water flow to keep the water level of the fifth exchange column at 1 / 3 of the upper observation window. Take out the water for conductivity testing. When the conductivity is ≤10uS / cm, close the lower valve of the fifth exchange column and open the outlet valve to collect deionized water.

[0025] S3 When the conductivity is >10uS / cm, perform maintenance on the first exchange column, the second exchange column, the third exchange column, the fourth exchange column, and the fifth exchange column; In this embodiment of the invention, before maintenance, both the inlet and outlet valves are closed, as are the four connecting valves. All five upper nuts are open, all five lower nuts are closed, all five upper valves are open, and all five lower valves are closed.

[0026] Specific methods: S31 When the conductivity is >10uS / cm, connect the lower valve port of each exchange column to deionized water or distilled water, open the lower valve and control the inlet water flow rate to backflush into the interior of each exchange column, and let the liquid level of each exchange column drop to the bottom of the upper observation window. In this embodiment of the invention, the lower valve ports of each exchange column are connected to deionized water or distilled water. The lower valves are opened and the inlet flow rate is controlled to backwash into the interior of each column. The first exchange column is backwashed to remove filtered and precipitated contaminants. The second to fifth exchange columns are backwashed to loosen the hardened resin and flush out any expired resin. After backwashing of the second to fifth exchange columns, all four lower valves are closed. After backwashing of the first exchange column, the pipe connections to the lower valve ports are disconnected, allowing the liquid level in each exchange column to slowly drop to the bottom of the upper observation window before closing the lower valves. Finally, the upper nut is tightened and the upper valve is closed.

[0027] S32 uses a water pump to pump hydrochloric acid solution into the second and fourth exchange columns, and then out, causing the liquid level in the second and fourth exchange columns to drop to the bottom of the upper observation window; In this embodiment of the invention, a 4%±1% hydrochloric acid solution is prepared. The hydrochloric acid solution is connected to the lower valve ports of the second and fourth exchange columns, and the lower valves are opened. The hydrochloric acid solution is pumped into the second and fourth exchange columns using a water pump (the water flow rate should be controlled), and then flows out through the opened upper nut port. The treatment process lasts for 2.0 to 2.5 hours. After the treatment is completed, the pipe connection to the lower valve port is disconnected, and the liquid level in the second and fourth exchange columns is allowed to slowly drop to the bottom of the upper observation window before the lower valve is closed. Finally, the upper nut is tightened and the upper valve is closed.

[0028] S33 uses a water pump to pump sodium hydroxide solution into the third and fifth exchange columns, and then out, causing the liquid levels in the third and fifth exchange columns to drop to the bottom of the upper observation window.

[0029] In this embodiment of the invention, a 4%±1% sodium hydroxide solution is prepared. The sodium hydroxide solution is connected to the lower valve ports of the third and fifth exchange columns, and the lower valves are opened. The sodium hydroxide solution is pumped into the third and fifth exchange columns using a water pump (the water flow rate should be controlled), and then flows out through the opened upper nut port. The treatment process lasts for 2.0 to 2.5 hours. After the treatment is completed, the pipe connection to the lower valve port is disconnected, and the liquid level in the third and fifth exchange columns is allowed to slowly drop to the bottom of the upper observation window before the lower valve is closed. Finally, the upper nut is tightened and the upper valve is closed.

[0030] S4 performs water treatment again on the first, second, third, fourth, and fifth exchange columns after maintenance, and tests the rinsing pH value and conductivity until the conductivity is ≤10uS / cm, and collects the deionized water.

[0031] In this embodiment of the invention, the inlet valve is slowly opened to maintain a certain flow rate, allowing the water to be treated to enter the first exchange column. When the water level rises to half the height of the observation window on the first exchange column, the connecting valve between the first and second exchange columns is opened, allowing the water to be treated to flow from the first exchange column into the second exchange column.

[0032] When the water level rises to half the height of the observation window on the second exchange column, open the lower valve of the second exchange column and control the flow rate to ensure the water level in the second exchange column remains at one-third of the height of the upper observation window. Use pH test paper to check the pH value at the lower valve opening of the second exchange column. When the pH value reaches 4-5, close the lower valve of the second exchange column, and then open the connecting valve between the second and third exchange columns, allowing the water to flow from the second exchange column into the third exchange column.

[0033] When the water level rises to half the height of the observation window on the third exchange column, open the lower valve of the third exchange column and control the flow rate to ensure the water level in the third exchange column remains at one-third of the height of the upper observation window. Use pH test paper to check the pH value at the lower valve opening of the third exchange column. When the pH value reaches 9-10, close the lower valve of the third exchange column, and then open the connecting valve between the third and fourth exchange columns, allowing the water to flow from the third exchange column into the fourth exchange column.

[0034] When the water level rises to half the height of the observation window on the fourth exchange column, open the lower valve of the fourth exchange column and control the flow rate to ensure the water level in the fourth exchange column remains at one-third of the height of the upper observation window. Use pH test paper to check the pH value at the lower valve opening of the fourth exchange column. When the pH value reaches 4-5, close the lower valve of the fourth exchange column, and then open the connecting valve between the fourth and fifth exchange columns, allowing the water to flow from the fourth exchange column into the fifth exchange column.

[0035] When the water level rises to half the height of the observation window on the fifth exchange column, open the lower valve of the fifth exchange column and control the flow rate to ensure the water level in the fifth exchange column remains at one-third of the height of the upper observation window. Use pH test paper to check the pH value at the lower valve of the fourth exchange column. When the pH value reaches 7-8, take a sample of the water coming out of the lower valve of the fifth exchange column and test its conductivity. When the conductivity is ≤10 μS / cm, close the lower valve of the fifth exchange column. Finally, open the outlet valve to collect the deionized water.

[0036] Please see Figure 5 Secondly, the present invention also provides a deionized water regeneration system based on staged ion exchange, which is applied to the deionized water regeneration method based on staged ion exchange as described in the first aspect above, including a first exchange column, a second exchange column, a third exchange column, a fourth exchange column and a fifth exchange column, wherein the first exchange column, the second exchange column, the third exchange column, the fourth exchange column and the fifth exchange column are connected in sequence through a valve group; The first exchange column is used to filter out mud, sand, and pipe impurities from the water; The second exchange column, based on the ion exchange principle of cation exchange resin, adsorbs impurity cations in the water and releases hydrogen ions; The third exchange column, based on the ion exchange principle of anion exchange resin, adsorbs impurity anions in the water and releases hydroxide ions. The fourth exchange column, based on the ion exchange principle of cation exchange resin, adsorbs impurities in water through cation adsorption and releases hydrogen ions. The fifth exchange column, based on the ion exchange principle of anion exchange resin, adsorbs impurity anions in the water and releases hydroxide ions.

[0037] In this embodiment, the first exchange column is used to filter out easily precipitated substances such as mud, sand, and pipe impurities in the water to prevent the precipitates from contaminating the resin of the second exchange column; the second and fourth exchange columns are based on the ion exchange principle of cation exchange resin, adsorbing impurity cations in the water and releasing hydrogen ions to complete the exchange; the third and fifth exchange columns are based on the ion exchange principle of anion exchange resin, adsorbing impurity anions in the water and releasing hydroxide ions to complete the exchange.

[0038] The above-disclosed embodiments are merely preferred embodiments of the deionized water regeneration method and system based on staged ion exchange of this application, and should not be construed as limiting the scope of this application. Those skilled in the art can understand that implementing all or part of the above embodiments and making equivalent changes in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A deionized water regeneration method based on staged ion exchange, characterized in that, Includes the following steps: The initial configuration includes the first, second, third, fourth, and fifth switching posts. The first, second, third, fourth, and fifth exchange columns were sequentially subjected to water treatment, and the conductivity of the water effluent from the fifth exchange column was tested. When the conductivity is greater than 10 μS / cm, maintenance is performed on the first, second, third, fourth, and fifth exchange columns. The first, second, third, fourth, and fifth exchange columns were treated with water again after maintenance, and the rinsing pH value and conductivity were tested until the conductivity was ≤10uS / cm, and the deionized water was collected.

2. The deionized water regeneration method based on staged ion exchange as described in claim 1, characterized in that, The specific method for initially configuring the first, second, third, fourth, and fifth switch posts is as follows: Pour the cleaned blue sand into the first exchange column until the blue sand is level with the bottom of the observation window; Pre-soak the cation exchange resin in hydrochloric acid solution and rinse it until the pH value is 4-5. Then pour the cation exchange resin into the second and fourth exchange columns until the cation exchange resin is flush with the bottom of the upper observation window. Pre-soak the anion resin in sodium hydroxide solution and rinse the cation resin until the pH value is 9-10. Then pour the anion resin into the third and fifth exchange columns until the anion resin is flush with the bottom of the upper observation window.

3. The deionized water regeneration method based on staged ion exchange as described in claim 1, characterized in that, The specific method for sequentially treating water using the first, second, third, fourth, and fifth exchange columns, and testing the conductivity of the water effluent from the fifth exchange column is as follows: Open the inlet valve to maintain a certain flow rate so that the water to be treated enters the first exchange column. When the water level rises to 1 / 2 of the height of the upper observation window, open the connecting valve between the first and second exchange columns to allow the water to be treated to flow into the second exchange column. When the water level rises to half the height of the observation window on the second exchange column, open the valve connecting the second and third exchange columns to allow the water to flow into the third exchange column. When the water level rises to 1 / 2 the height of the observation window on the third exchange column, open the connecting valve between the third and fourth exchange columns to allow the water to flow into the fourth exchange column. When the water level rises to 1 / 2 the height of the observation window on the fourth exchange column, open the connecting valve between the fourth and fifth exchange columns to allow the water to flow into the fifth exchange column. When the water level rises to 1 / 2 the height of the observation window on the fifth exchange column, open the lower valve of the fifth exchange column and control the water flow to keep the water level of the fifth exchange column at 1 / 3 of the height of the upper observation window. Take out the water and test its conductivity. When the conductivity is ≤10uS / cm, close the lower valve of the fifth exchange column and open the outlet valve to collect the deionized water.

4. The deionized water regeneration method based on staged ion exchange as described in claim 1, characterized in that, The specific method for maintaining the first, second, third, fourth, and fifth exchange columns when the conductivity is >10 μS / cm is as follows: When the conductivity is >10uS / cm, connect the lower valve port of each exchange column to deionized water or distilled water, open the lower valve and control the inlet water flow rate to backflush into the interior of each exchange column, and let the liquid level of each exchange column drop to the bottom of the upper observation window. Hydrochloric acid solution is pumped into the second and fourth exchange columns and then flows out, causing the liquid level in the second and fourth exchange columns to drop to the bottom of the upper observation window. Sodium hydroxide solution is pumped into the third and fifth exchange columns and then flows out, causing the liquid levels in the third and fifth exchange columns to drop to the bottom of the upper observation window.

5. A deionized water regeneration system based on staged ion exchange, applied to the deionized water regeneration method based on staged ion exchange as described in any one of claims 1-4, characterized in that, It includes a first exchange column, a second exchange column, a third exchange column, a fourth exchange column, and a fifth exchange column, which are connected in sequence through a valve group; The first exchange column is used to filter out mud, sand, and pipe impurities from the water; The second exchange column, based on the ion exchange principle of cation exchange resin, adsorbs impurity cations in the water and releases hydrogen ions; The third exchange column, based on the ion exchange principle of anion exchange resin, adsorbs impurity anions in the water and releases hydroxide ions. The fourth exchange column, based on the ion exchange principle of cation exchange resin, adsorbs impurities in water through cation adsorption and releases hydrogen ions. The fifth exchange column, based on the ion exchange principle of anion exchange resin, adsorbs impurity anions in the water and releases hydroxide ions.

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