KAg (CN) 2 wastewater deep deacidification and desalination method based on ion exchange resin

Abstract

The invention discloses a KAg (CN) 2 industrial wastewater deep deacidification and desalination method based on ion exchange resin, and belongs to the technical field of wastewater treatment. According to the method, strong acid type and strong base type ion exchange resin series bed design is adopted, K < + > in wastewater is removed through cation exchange reaction, and strong acid type resin adsorbs K < + > and releases equal amount of H < + >; nO3 <-> is removed through anion exchange reaction, the strong-base resin adsorbs NO3 <-> and releases the same amount of OH <->, synergistic removal of strong acid and extra-high salinity is achieved, deacidification is effectively achieved, and the problem that the degree of mineralization is improved due to a traditional chemical precipitation method is solved; high power consumption and secondary pollution of a traditional electrolytic method are avoided through the series bed design, FPC23-H + and FPA90-OH-model resins are connected in series, KAg (CN) 2 industrial wastewater is treated, the concentration of K + in the wastewater is reduced to 140 mg / L from 7800 mg / L, the concentration of NO3-is reduced to 252 mg / L from 26000 mg / L, the pH value is increased to 7.2 from less than 1.0, the treatment effect is remarkable, and the waste liquid treatment requirement is met.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wastewater treatment, and particularly relates to a method for deep deacidification and desalination of KAg(CN)2 industrial wastewater based on ion exchange resin. BACKGROUND

[0002] Silver extraction by cyanidation wet metallurgy has a history of more than 100 years. As the process is simple and the silver recovery rate is high, it is still the mainstream wet silver leaching process in the world at present and in the future. As a very important chemical reagent in silver plating and alloy process, KAg(CN)2 is a key intermediate for silver extraction in wet metallurgy. As a manufacturing power, China accounts for about 30% of the world's total production and demand of KAg(CN)2, with an average annual growth rate of about 4%-5%, and the annual output is expected to exceed 1200 tons. More than 200 KAg(CN)2 enterprises in China produce about 300 million tons of cyanide-containing wastewater and 100 million tons of cyanide slag per year, of which cyanide-containing wastewater from smelting plants has become the main pollution discharge source of wet smelting enterprises, causing great risk to human health and environmental safety.

[0003] In the production of KAg(CN)2, the wastewater mainly contains Ag(CN)2 - (very low concentration), Ag + (very low concentration), NO3 - (very high concentration), K + (very high concentration), and pH≤1, showing the characteristics of trace cyanide, strong acidity and high salt content. Trace cyanide-containing wastewater often contains precious metals, which are recovered and then enter the treatment facilities for strong acid and super high salt content wastewater for cyanide oxidation treatment, so that water can be recycled. Therefore, in order to meet the environmental protection requirements of "zero discharge", it is urgent to solve the problem of strong acid and super high salt content wastewater coexisting in the production process of KAg(CN)2. The adsorption method stands out with the advantages of low cost, simple process operation and environmental friendliness. Among them, resin adsorbents are endowed with high research and application value due to their good regeneration performance, excellent adsorption performance and difficulty in causing secondary pollution. Acid and alkaline ion exchange resins, as an economical and feasible adsorbent, have high universality and can separate and remove different charged ions in wastewater into two categories of positive and negative. However, the existing ion exchange resins still have the following problems in treating KAg(CN)2 industrial wastewater: 1) the selectivity of the resin to target ions is insufficient, and it is easily interfered by competitive ions; KAg(CN)2 wastewater contains various ions (such as K + , Ag + , NO3 - , CN -), the selectivity of traditional resins (such as D296, 201x7, LSD263, etc.) to target ions is low, especially in a complex ion system, which is easily affected by competitive adsorption, resulting in insufficient adsorption capacity and difficulty in realizing deep desalination; 2) the stability of the resin in a strong acidic environment is poor, and degradation or passivation easily occurs, the pH value of KAg(CN)2 wastewater is usually lower than 1.0, and the traditional resin is easily protonated, thereby losing the anion exchange capacity, resulting in a significant decrease in the removal rate of NO3 - ; low acid conditions easily swell and break, and the mechanical strength and chemical stability are insufficient, and the service life is shortened; the single resin system is difficult to simultaneously realize the synergistic effect of deacidification and desalination. SUMMARY

[0004] In view of the problems that it is difficult to simultaneously effectively remove strong acid and ultra-high salinity in the existing wastewater treatment process, and secondary pollution is easily caused in the treatment process, the present application aims to provide a KAg(CN)2 industrial wastewater deep deacidification and desalination method based on ion exchange resin method, which realizes the technical treatment of combined deacidification and desalination by skillfully converting and combining resin types, and the cyanide wastewater after double desalination can be recycled in the process to realize the "zero discharge" goal.

[0005] In order to achieve the above purpose, the following technical scheme is adopted: The present application provides a KAg(CN)2 industrial wastewater deep deacidification and desalination method based on ion exchange resin, comprising: Step 1, ion exchange resin pretreatment and transformation / regeneration, transferring the ion exchange resin after pretreatment and transformation / regeneration to a chromatographic column, and making the KAg(CN)2 industrial wastewater to be treated pass through each chromatographic column in series; The ion exchange resin comprises strong acid type ion exchange resin and strong base type ion exchange resin; Step 2, ion exchange treatment of the KAg(CN)2 industrial wastewater to be treated with the strong acid type ion exchange resin, to remove high-concentration K + and trace Ag + , to obtain a leakage liquid 1; Step 3, ion exchange treatment of the leakage liquid 1 with the strong base type ion exchange resin, to remove ultra-high salt component NO3 - from the leakage liquid 1, and to neutralize the ultra-high component H - in the leakage liquid 1 with OH + exchanged from the step, to realize further deacidification, to obtain a leakage liquid 2, i.e. a qualified circulating water.

[0006] The strong acid type ion exchange resin is selected from any one of FPC11, FPC23 and FPC252, and the strong base type ion exchange resin is selected from any one of FPA40, FPA53, FPA90, FPA98, IRS67, IRA458, DOWEX66, FPA98 and HPR9700.

[0007] The pH of the KAg(CN)2industrial wastewater to be treated is <1.0, the concentration of K + is ≥7800 mg / L, and the concentration of NO3 - is ≥26000 mg / L.

[0008] In step 1, the pretreatment of the strong acid type and strong base type ion exchange resins specifically includes swelling with ethanol for 3-4 hours, washing with distilled water, and completing the pretreatment of the strong acid type and strong base type ion exchange resins after transformation / regeneration.

[0009] The amount of ethanol used is 2-4 BV, and the amount of distilled water used is 4-6 BV.

[0010] The transformation / regeneration of the strong acid type ion exchange resin includes elution with a hydrochloric acid solution with a concentration of 1-3 wt% for 3-4 BV until the pH of the effluent water is <4, and then washing with deionized water until the effluent water is neutral.

[0011] The transformation / regeneration of the strong base type ion exchange resin includes elution with a potassium hydroxide solution with a concentration of 1-3 wt% for 3-4 BV until the pH of the effluent water is >10, and then washing with deionized water until the effluent water is neutral.

[0012] In step 2, the amount of strong acid type ion exchange resin used is with a diameter-height ratio of 1:5-7, and the flow rate of the KAg(CN)2industrial wastewater to be treated is 1.0-3.0 BV / h.

[0013] In step 3, the amount of strong base type ion exchange resin used is with a diameter-height ratio of 1:2-4, and the flow rate of the effluent 1 is 1.0-3.0 BV / h.

[0014] The method for deep deacidification and desalination of KAg(CN)2industrial wastewater based on ion exchange resin further includes a post-treatment effect detection step, specifically detecting the H + concentration, K + concentration and NO3 - concentration of the effluent 2.

[0015] The pH of the effluent 2 is 7.0-7.2, the concentration of K + is 160-140 mg / L, and the concentration of NO3 - is 280-252 mg / L.

[0016] Compared with the prior art, the application has the following technical effects: The application provides a KAg(CN)2 industrial wastewater deep deacidification and desalination method based on an ion exchange resin method. + , K + and NO3 - , and the strong acid and the super-high salinity in the wastewater are removed cooperatively, and the defects that the strong acid and the super-high salinity cannot be effectively removed simultaneously in the traditional treatment method are overcome. + The K + is adsorbed to the resin, and an equal amount of H + is released simultaneously. - The NO3 - is adsorbed to the resin, and an equal amount of OH - is released simultaneously. + The NO3 - and the acid in the wastewater are effectively removed, and the problem that the mineralization degree is increased due to the addition of reagents in the wastewater in the traditional chemical precipitation method is avoided. + The K - , NO3 + and H + in the wastewater can be effectively removed, the problems of high power consumption and secondary pollution in the traditional electrolysis method are avoided, and the harmless treatment of the wastewater is realized.

[0017] Further, by preferably using specific types of ion exchange resins such as FPC23-H + and FPA90-OH - , the chemical stability of the resins is ensured, the operation stability and service life of the treatment system are improved, the concentration of K + in the wastewater is reduced from 7800 mg / L to 140 mg / L, the concentration of NO3 - is reduced from 26000 mg / L to 252 mg / L, and the pH value is significantly improved from <1.0 to 7.2, the treatment effect is remarkable, and various requirements of the wastewater treatment are met. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1A flowchart of the KAg(CN)2 industrial wastewater deep deacidification and desalination method based on ion exchange resin method of the present application; Figure 2 K + NO3 - and H + removal effect, wherein A is the ultra-high salinity NO3 - K + removal effect before and after treatment, B is the H + removal effect before and after treatment. DETAILED DESCRIPTION

[0019] In order to enable personnel in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0020] The specific experimental steps or conditions not mentioned in the embodiments can be performed according to the conventional experimental steps or conditions described in the literature in the art. The reagents or instruments used are not marked with the manufacturer, and are all conventional reagent products that can be obtained by purchase. In the present application, if not specially stated, the experimental raw materials used are all commercially available goods well known to those skilled in the art.

[0021] The present application uses strong acid type ion exchange resin FPC23 and strong base type ion exchange resin FPA90 as specific resin adsorbents (purchased from Rohm & Haas); KAg(CN)2 industrial cyanidation wastewater containing strong acid and ultra-high salinity K + NO3 - is provided by Henan Sanmenxia Chaoyang Technology Co., Ltd., and the specific composition of the waste liquid is Ag(CN)2 - (≦2.31 mg / L), Ag + (≦1.45 mg / L), NO3 - (≧2.6×10 4 mg / L), K + (≧7.8×10 3 mg / L), and pH value ≤ 1; the chemical reagents used are all commercially available analytical grade goods. I. Specific embodiments Embodiment 1 The present embodiment provides a KAg(CN)2 industrial wastewater deep deacidification and desalination method based on ion exchange resin, specifically comprising the following steps: (1) Pretreatment of strong acid type ion exchange resin FPC23 and strong base type ion exchange resin FPC23 / FPA90 Take 100 mL FPC23-H + type and 50 mL FPA90-Cl - resin, add 3 times the volume of ethanol to the container containing the resin, swell for 3-4 h, then rinse with 5 times the volume of distilled water, and reserve for use.

[0023] (2) Transformation of strong base type ion exchange resin FPA90-Cl - type resin Take the pretreated FPA90-Cl - type resin with a diameter-height ratio of 1:3, and use the wet column loading method to slowly and uniformly load the resin into a glass column with an inner diameter of 3.2 cm; prepare a KOH transformation solution with a molar concentration of 1 mol / L, pass the transformation solution through the resin bed at a flow rate of 1 BV / h, and the OH - in the transformation solution will undergo ion exchange reaction with Cl - on the resin to transform the resin into FPA90-OH - type; after the transformation is complete, rinse the resin bed with 5 BV of distilled water at a flow rate of 3-5 BV / h until the pH of the effluent water is neutral, and obtain FPA90-OH - type resin, which is reserved for use.

[0024] (3) Removal of high salt component K + Take the pretreated FPC23-H + type resin with a diameter-height ratio of 1:6, and use the wet column loading method to load the resin into a glass column with an inner diameter of 3.2 cm; take 620 mL of industrial wastewater containing strong acid (pH <1) and super-high salt K + , NO3 - Ag(CN)2, and pass it through the FPC23-H + type ion exchange resin bed at a speed of 1.0 BV / h until it is completely leaked out, and collect the leakage 1.

[0025] (4) Removal of acid and super-high salt component NO3 - Take 620 mL of leakage 1, and pass it through the FPA90-OH - type resin bed with a diameter-height ratio of 1:3 at a speed of 1.0 BV / h until it is completely leaked out, and collect the leakage 2 for testing.

[0026] ​​The method for deep deacidification and desalination of KAg(CN)2 industrial wastewater based on ion exchange resin exhibited by the embodiment realizes the synergistic removal of strong acid and super high salt (K + / NO3 - ) in KAg(CN)2 industrial wastewater, and the specific process flow is shown in Figure 1 . By skillfully connecting two kinds of strong acid and strong base ion resins in series, and optimizing the resin bed layers with different bed heights, an efficient desalination and deacidification method is built. By using anion and cation exchange method, the super high concentration of H + , K + , NO3 - in the cyanide wastewater in the smelting process of KAg(CN)2 is synergistically removed.

[0027] Cation exchange stage: KAg(CN)2 industrial wastewater first flows through the strong acid cation exchange resin bed FPC23-H + , based on the principle of cation exchange, the high concentration of K + in the waste liquid preferentially undergoes cation exchange with H + on the resin bed FPC23-H + , so that K + is adsorbed onto the resin to form FPC23-K + , and an equal amount of H + is released into the effluent 1. The effluent 1 in this stage contains a large amount of H + , NO3 - and a small amount of unabsorbed K + , Ag + , Ag(CN) - .

[0028] Anion exchange and neutralization reaction stage: after the effluent 1 further flows through the strong base anion exchange resin bed FPA90-OH - with a bed height halved, the super high concentration of NO3 - in the waste liquid preferentially undergoes anion exchange with OH - on the resin bed FPA90-OH - , NO3 - is adsorbed onto the resin to form FPA90-NO3 - , and an equal amount of OH - is released, the released OH - undergoes neutralization reaction with a large amount of H + in the effluent 1 to generate neutral H2O, realizing the synergistic removal of strong acid and super high concentration of NO3 - . The effluent 2 in this stage contains a large amount of neutral H2O and a small amount of unabsorbed K + , NO3 - , Ag +and Ag(CN) - It is obvious that through two-stage series adsorption, the strong acid and super high salt are removed simultaneously, which can meet the requirements of circulating water and finally achieve the goal of "zero discharge" of environmental protection.

[0029] Example 2 The embodiment provides a method for deep deacidification and desalination of KAg(CN)2 industrial wastewater based on ion exchange resin, and specifically comprises the following steps: (1) Pretreatment of strong acid type ion exchange resin FPC252 and strong alkali type ion exchange resin FPA40 Take 100 mL FPC252-H + type and 50 mL FPA40-Cl - type resin, respectively, add 3 times the volume of ethanol to swell the resin in the container for 3-4 h, then rinse with 5 times the volume of distilled water, and reserve for use.

[0030] (2) Transformation of strong alkali type ion exchange resin FPA40-Cl - type resin Take the pretreated FPA40-Cl - type resin with a diameter-height ratio of 1:3.5, and slowly and uniformly load the resin into a glass column with an inner diameter of 3.2 cm by using a wet column loading method; prepare a KOH transformation solution with a molar concentration of 1 mol / L, pass the transformation solution through the resin bed layer at a flow rate of 1 BV / h, and the OH - in the transformation solution will exchange ions with Cl - on the resin to transform the resin into FPA40-OH - type; after the transformation is completed, rinse the resin bed layer with 5 BV of distilled water at a flow rate of 3-5 BV / h until the pH value of the effluent water is neutral, to obtain FPA40-OH - type resin, which is reserved for use.

[0031] (3) Removal of high salt component K + Take the pretreated FPC252-H + type resin with a diameter-height ratio of 1:7, and load the resin into a glass column with an inner diameter of 3.2 cm by using a wet column loading method; take 620 mL of silver potassium cyanide industrial wastewater containing strong acid (pH<1) and super high salt K + , NO3 - , and pass the wastewater through the FPC252-H + type resin bed layer at a speed of 1.0 BV / h until the wastewater completely leaks out, and collect the leakage 1.

[0032] (4) Acid and super high salt component NO3​- removal Take 620 mL of leak 1 and flow it through FPA 40-OH at a rate of 1.0 BV / h with a diameter-to-height ratio of 1:3.5. - The resin bed was completely leaked out, and the leaked liquid was collected for testing.

[0033] Example 3 This embodiment provides a method for deep deacidification and desalination of industrial wastewater containing potassium silver cyanide based on ion exchange resin, specifically including the following steps: (1) Pretreatment of strong acid type ion exchange resin FPC11 and strong base type ion exchange resin FPA53 Take 100 mL of FPC11-H respectively + Type and 50 mL FPA53-Cl - For the resin, add 3 times its volume of ethanol to the container containing the resin to swell it for 3-4 hours, then rinse it thoroughly with 5 times its volume of distilled water and set aside.

[0034] (2) Strong base type ion exchange resin FPA53-Cl - Transformation of type resin Weigh out the pretreated FPA53-Cl at a diameter-to-height ratio of 1:4. - The resin was packed slowly and uniformly into a glass column with an inner diameter of 3.2 cm using a wet packing method. A KOH conversion solution with a molar concentration of 1 mol / L was prepared and passed through the resin bed at a flow rate of 1 BV / h at a volume of 3 BV. The OH groups in the conversion solution... - It will react with Cl on the resin - An ion exchange reaction occurs, transforming the resin into FPA 40-OH. - After the conversion is complete, the resin bed is flushed with 5 BV distilled water at a flow rate of 3-5 BV / h until the pH of the effluent is neutral, yielding FPA53-OH. - Type of resin, for later use.

[0035] (3) High salt component K + removal Weigh out the pretreated FPC11-H with a diameter-to-height ratio of 1:8. + The resin was packed using a wet packing method, with the resin placed into a glass column with an inner diameter of 3.2 cm. 620 mL of a solution containing a strong acid (pH < 1) and extremely high salinity K was then prepared. + NO3 - Industrial wastewater containing potassium silver cyanide flows through FPC11-H at a rate of 1.0 BV / h. + The ion exchange resin bed is bleeded until it is completely drained, and the leaked liquid is collected.

[0036] (4) Acid and extremely high salt content NO3 - removal Take 620 mL of leak 1 and flow it through FPA53-OH at a rate of 1.0 BV / h with a diameter-to-height ratio of 1:4. - The resin bed was completely leaked out, and the leaked liquid was collected for testing.

[0037] II. Performance Testing (i) Acid detection: Using a pH meter S-220, and with KH2PO4 / K2HPO4 mixed standard buffer (pH 6.86) as the calibration solution, FPC23-H was measured. + &FPA90-OH - The H2 in the original waste liquid and the leaked liquid 2 before and after the adsorption of the type-type resin in series + concentration.

[0038] (ii) High salt component K + Detection: The FPC23-H was determined using a graphite furnace atomic absorption spectrophotometer AA-7020 according to GB11904-89 flame atomic absorption spectrophotometry. + Type 2 resin collects K from the original waste liquid and leaked liquid before and after adsorption. + concentration.

[0039] (iii) Extremely high salt content NO3 - Detection: FPC23-H was determined using a PIC-10 ion chromatograph according to the HJ 84-2016 ion chromatography method. + &FPA90-OH - Type II resin series adsorption of NO3 in the original waste liquid and leaked liquid 2 before and after adsorption - concentration.

[0040] According to the above design scheme, the results of Embodiment 1 of the present invention are as follows: Figure 2 As shown. Extremely high concentrations of NO3 in KAg(CN)2 industrial wastewater. - High concentrations of potassium (K) can reach up to 26,000 mg / L. + The concentration of NO3 was 7800 mg / L, and the pH value of the KAg(CN)2 industrial wastewater was <1.0. After treatment using the method provided in Example 1, NO3... - The concentration decreased to 252 mg / L, K + When the concentration drops to 140 mg / L, calculate the removal rate of NO3. - The removal rate was 99.03%, K + The removal rate was 98.21%, and the pH value of the treated KAg(CN)2 industrial wastewater reached 7.2, close to neutral. Other examples yielded similar results. These results indicate that this method is effective against NO3. -and K + The removal effect of the two kinds of super-high salt ions in wastewater is extremely significant, and the concentration of the two kinds of super-high salt ions in wastewater can be effectively reduced; especially the FPA90-OH - The OH - released by the FPA90-OH + type resin reacts with H + in the waste liquid, successfully adjusts the acidity of the wastewater, and makes the wastewater reach a relatively ideal acid-base state, completely meets the needs of synergistic desalination and deacidification of the waste liquid, and demonstrates that the above method is simple, ingenious, efficient and feasible.

[0041] In summary, the present application aims at the scientific problems of cyanide-containing wastewater, acidic wastewater and high salt content in the production of KAg(CN)2 in the hydrometallurgy industry, combines the complexity of industrial waste liquid and the green environmental protection demand of "zero discharge", and respectively selects the strong acid type ion exchange resin containing-SO3 - functional group for effectively removing high K - from wastewater, and the strong base type ion exchange resin containing-N + (CH3)3 functional group for removing strong acid and super-high NO3 -; on this basis, according to the acidity of the waste liquid and the content of anions and cations, the dosage ratio and ionic type of the two kinds of resins are further optimized; ingeniously adopting the way of series resin bed, on the basis of synergistically removing strong acid and super-high salt in wastewater, the recovery concept of cyanide and heavy metal is put forward, the water recycling is maximized, and the harmless and resource utilization of cyanide-containing wastewater are ensured. In actual industrial operation, according to the wastewater quality, size, economic requirements, "zero discharge" treatment target, the practical treatment scheme can be formulated by referring to the method involved in the present application.

[0042] The above content is only for illustrating the technical idea of the present application, and cannot limit the protection scope of the present application, and any modification made according to the technical idea of the present application on the basis of the technical scheme falls within the protection scope of the claims of the present application.

Claims

1. A method for deep deacidification and desalination of KAg(CN)2 industrial wastewater based on ion exchange resins, characterized by, The method comprises the following steps: Step 1, ion exchange resin pretreatment and transformation / regeneration, transferring the pretreated and transformed / regenerated ion exchange resin to a chromatographic column, and passing the KAg(CN)2 industrial wastewater to be treated through each chromatographic column in series; The ion exchange resin comprises strong acid type ion exchange resin and strong base type ion exchange resin; Step 2, the KAg(CN)2industrial wastewater to be treated is ion exchanged with a strong acid type ion exchange resin to remove high concentration K + and trace Ag + from the wastewater, obtaining the liquid leakage 1; Step 3, ion exchange treatment of the leakage 1 with strong base type ion exchange resin to remove the NO3 - and use the ion-exchanged OH - to neutralize the H + in the leakage 1, achieve further deacidification, and obtain the leakage 2, i.e. the qualified circulating water.

2. The method for deep deacidification and desalination of KAg(CN)2 industrial wastewater based on ion exchange resin according to claim 1, characterized in that, The strong acid type ion exchange resin is selected from any one of FPC 11, FPC 23 and FPC 252, and the strong base type ion exchange resin is selected from any one of FPA 40, FPA 53, FPA 90, FPA 98, IRS 67, IRA 458, DOWEX 66, FPA 98 and HPR 9700.

3. The method for deep deacidification and desalination of KAg(CN)2 industrial wastewater based on ion exchange resin according to claim 1, characterized in that, The pH of the KAg(CN)2industrial wastewater to be treated is < 1.0, the concentration of K + is ≥ 7800 mg / L, and the concentration of NO3 - is ≥ 26000 mg / L.

4. The method for deep deacidification and desalination of KAg(CN)2 industrial wastewater based on ion exchange resin according to claim 1, characterized in that, In step 1, the pretreatment of the strong acid type and strong base type ion exchange resin is specifically swelling with ethanol for 3-4 h, and then washing with distilled water, and the pretreatment of the strong acid type and strong base type ion exchange resin is completed after transformation / regeneration.

5. The method for deep deacidification and desalination of KAg(CN)2 industrial wastewater based on ion exchange resin according to claim 4, characterized in that, The amount of the ethanol is 2-4 BV, and the amount of the distilled water is 4-6 BV.

6. A method for deep deacidification and desalination of KAg(CN)2 industrial wastewater based on ion exchange resin according to claim 4, characterized by, The transformation / regeneration of the strong acid type ion exchange resin is elution with a hydrochloric acid solution with a concentration of 1-3 wt% for 3-4 BV until the pH of the effluent water is less than 4, and then washing with deionized water until the effluent water is neutral; and the transformation / regeneration of the strong base type ion exchange resin is elution with a potassium hydroxide solution with a concentration of 1-3 wt% until the pH of the effluent water is greater than 10, and then washing with deionized water until the effluent water is neutral.

7. The method for deep deacidification and desalination of KAg(CN)2 industrial wastewater based on ion exchange resin according to claim 1, characterized in that, In step 2, the amount of the strong acid type ion exchange resin is a diameter-height ratio of 1:5-7, and the flow rate of the KAg(CN)2 industrial wastewater to be treated is 1.0-3.0 BV / h.

8. The method for deep deacidification and desalination of KAg(CN)2 industrial wastewater based on ion exchange resin according to claim 1, characterized in that, In step 3, the amount of the strong base type ion exchange resin is a diameter-height ratio of 1:2-4, and the flow rate of the liquid leakage 1 is 1.0-3.0 BV / h.

9. The method for deep deacidification and desalination of KAg(CN)2 industrial wastewater based on ion exchange resin according to any one of claims 1-8, characterized in that, Also included is a post-treatment effect detection step, specifically detecting H + concentration, K + concentration and NO3 - concentration.

10. The method for deep deacidification and desalination of KAg(CN)2 industrial wastewater based on ion exchange resin according to claim 9, characterized in that, The pH of the leakage 2 is 7.0-7.2, the concentration of K + is 160-140 mg / L, and the concentration of NO3 - is 280-252 mg / L.

Images