HY catching agent as well as preparation method and application thereof
By utilizing the chelation and flocculation mechanisms of HY scavenging agent, the problems of incomplete removal of heavy metals and high costs in pickling wastewater are solved, achieving efficient and low-cost acid regeneration and heavy metal precipitation, while avoiding acid root loss and equipment corrosion.
Patent Information
- Application Number
- CN202511245337.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2025-08-12
- Filing Date
- 2025-09-02
- Publication Date
- 2026-01-20
AI Technical Summary
Existing technologies for treating pickling wastewater suffer from high costs, cumbersome processes, incomplete removal of heavy metals, and significant loss of acid ions, and may also lead to equipment corrosion and secondary pollution.
Using HY scavenging agent, which includes pH buffer, adsorbent, ionic strength regulator, acid radical supplement and chelating agent, the heavy metal removal rate is ≥99% and the acid radical retention rate is ≥95% through chelation, flocculation and acid radical stabilization mechanisms, while avoiding acid radical neutralization and reducing treatment costs.
It achieves efficient removal of heavy metals, maintains constant acid concentration, reduces processing costs and equipment maintenance requirements, and improves acid regeneration efficiency and purity.
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Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of acid waste liquid regeneration and heavy metal removal, and more particularly relates to a HY capture agent and a preparation method and application thereof. BACKGROUND
[0002] Acid pickling wastewater usually contains high concentrations of acids such as hydrochloric acid, sulfuric acid, nitric acid, etc., and heavy metal ions such as iron, zinc, chromium, nickel, etc. If it is directly discharged or treated substandard, it will cause serious harm to the environment. However, from another aspect, the acid and heavy metals in the acid pickling wastewater are valuable resources that can be recycled. The existing technology usually regenerates the acid in the wastewater by neutralization, evaporation, ion exchange and other technologies, reduces the amount of new acid procurement, and reduces the cost of raw materials.
[0003] However, the neutralization method cannot effectively remove organic pollutants and needs to add subsequent biochemical treatment steps. The produced calcium salt has low solubility and is easy to form a covering layer on the surface of the filtration equipment, hindering the continuation of the reaction, producing a large amount of sludge, and the subsequent sludge treatment cost is high. Ion exchange resin may break, mechanically rupture or disintegrate during use, resulting in an increase in particulate matter in water, which in turn affects water quality. Some resins also have organic matter dissolution problems due to oxidation decomposition. The resin regeneration process is complex and time-consuming, and requires professional equipment maintenance, increasing operating costs. The crystallization method requires the use of special facilities such as evaporators and refrigeration equipment, which has a high equipment investment cost. At the same time, a large amount of heat energy is consumed in the evaporation and concentration process, significantly increasing the operating cost. After evaporation and concentration, cooling and crystallization are required, but some salts (such as ferrous sulfate) are easy to dehydrate to form insoluble substances (such as ferrous sulfate monohydrate), resulting in a decrease in the purity of the byproduct. The evaporation process needs to be neutralized and then concentrated, which is complicated and may cause equipment scaling, corrosion and other problems, further increasing maintenance costs. If the heavy metals and other pollutants are not effectively removed during the crystallization process, secondary pollution may occur. SUMMARY
[0004] The present application provides a HY capture agent and a preparation method and application thereof to overcome the above-mentioned defects of high cost, complicated process and ineffective removal of heavy metals.
[0005] To achieve the above-mentioned purposes, the present application adopts the following technical solutions:
[0006] The first aspect of the present application provides a HY trapping agent, comprising the following components in percentage of mass of the HY trapping agent: pH buffer 0.08%-2.00%, adsorbent 5.0%-12.0%, ionic strength regulator 0.01%-0.08%, acid radical supplement 0.03%-0.10%, chelating agent 0.01%-0.03%, sulfamate 0.05%-0.2%, and appropriate amount of deionized water.
[0007] Compared with the prior art, the present application adds sulfamate in the HY trapping agent, maintains the pH of the weak acid system, and inhibits Fe 2+ oxidation to Fe 3+ by the reducing property of the sulfamate (prevents excessive consumption of H + ), indirectly stabilizes the acid radical, and is supplemented by the pH buffer, adsorbent, ionic strength regulator, acid radical supplement, and chelating agent, so that the removal rate of heavy metals is greater than or equal to 99%, and the acid radical retention rate is greater than or equal to 95%, and when directly used in the pickling process, compared with the traditional neutralization method, the acid radical is avoided from being neutralized, the acid liquid supplement amount is reduced by more than 60%, and the treatment cost is reduced.
[0008] Further, the pH buffer comprises acetate; the adsorbent comprises metasilicate; the ionic strength regulator comprises halide salt; the acid radical supplement comprises sulfate; and the chelating agent comprises aminopolycarboxylate.
[0009] Compared with the prior art, the metasilicate in the regenerant is hydrolyzed to generate silicic acid colloid, adsorbs heavy metal ions to form large particle flocs, and directly generates a difficultly soluble silicate salt (such as Fe2(SiO3)3) with the heavy metal, so as to realize the precipitation of the metal ions; and in the traditional HY trapping agent, a flocculant such as polyaluminum chloride or a strong base is usually added, but the former has poor selectivity for heavy metals, and the latter easily neutralizes the acid radical excessively and consumes H + , and the innovation of the metasilicate can break through the traditional single precipitation function, and simultaneously realize the functions of heavy metal precipitation, flocculation carrier, and weak base adjustment; the generated silicate directly forms a difficultly soluble silicate salt with the heavy metal, the generated silicic acid colloid can adsorb fine particles to form large flocs, and the weak alkalinity can finely adjust the pH to the optimal range of heavy metal precipitation; the high proportion of 5.0%-12.0% strengthens the function of the metasilicate as the core functional carrier, and solves the problem of insufficient precipitation efficiency of the traditional low-dose metasilicate. The halide salt increases the ionic strength of the solution by high concentration of Cl - , reduces the solubility of heavy metal chlorides, maintains the Cl - concentration in the hydrochloric acid system, and avoids the consumption of the acid radical due to the precipitation reaction. The sulfate supplements SO4 2- to stabilize the acid radical concentration, and simultaneously with Ba 2+ , Pb 2+Sulphate is generated to precipitate, and the removal of heavy metals is enhanced. 2+ , N 2+ and other heavy metals, avoiding the formation of soluble salts with acid radicals, and then gradually releasing and precipitating in the weakly alkaline metasilicate environment.
[0010] Further, the acetate salt includes sodium acetate; the metasilicate salt includes anhydrous sodium metasilicate; the halide salt includes sodium chloride; the sulphate salt includes sodium sulphate; and the aminopolycarboxylate salt includes sodium nitrilotriacetate.
[0011] Compared with the prior art, sodium acetate is a weak acid salt, which can fine-tune the pH by buffering, and avoid excessive local alkalinity leading to neutralization of acid radicals. The silica colloid H2SiO3 generated by the hydrolysis of sodium metasilicate can adsorb heavy metal particles, and the silicate radical can directly participate in the precipitation reaction, so that the flocculation efficiency is significantly improved. Sodium chloride provides a high concentration of Cl - , which can reduce the solubility of heavy metal chlorides by salt effect, while maintaining the concentration of acid radicals in the hydrochloric acid system. Sodium sulphate supplements SO4 2- , which can be used for sulphuric acid type pickling waste liquid, stabilize the concentration of acid radicals, and promote the precipitation of PbSO4 and other substances, avoiding the decrease of SO4 2- concentration in regenerated acid. Sodium nitrilotriacetate selectively chelates Cr 3+ , Ni 2+ , Fe 2+ and other heavy metals, and the chelate dissociates in the weakly alkaline metasilicate environment, and the released metal ions combine with silicate radicals to form precipitates, effectively realizing the removal of heavy metal ions. It should be emphasized that the inventors have found that metasilicate, aminosulphonate and sulphate have a synergistic effect, and the combination of the three can effectively increase the heavy metal removal rate and the acid radical ion retention rate.
[0012] Further, the aminosulphonate includes sodium aminosulphonate.
[0013] The second aspect of the present application provides a preparation method of the HY capture agent, which is applied to the preparation of the HY capture agent, and includes the following processes:
[0014] Each component is weighed according to the HY capture agent;
[0015] The adsorbent and the deionized water are mixed and stirred to obtain a solution;
[0016] The pH buffer, the ion strength regulator, the acid radical supplement, the chelating agent and the aminosulphonate are sequentially added to the solution, and stirring and homogenization are performed to obtain the HY capture agent.
[0017] Compared with the prior art, the metasilicate is used as the adsorbent, the metasilicate is easy to dissolve in water, thus the metasilicate is mixed with water to form a solution, then the salt of the inorganic strong acid with high solubility (sulfate, halide) is dissolved, then the organic acid salt (acetate, sulfamate) is added, and finally the amino polycarboxylate salt with a small amount is added, so that the mutual interference between components can be reduced, and the uniform distribution of the components in the system is ensured.
[0018] Further, the stirring speed of the adsorbent and the deionized water is 200 rpm to 300 rpm, and the stirring time is 10 min to 15 min.
[0019] Further, after the anion supplement, the ion strength regulator, the pH buffer, the sulfamate, and the chelating agent are sequentially added to the solution, the solution is stirred at 200 rpm to 300 rpm for 1 h to 2 h, and then the solution is homogenized at 4000 rpm to 5000 rpm for 10 min to 15 min, so that a homogeneous mixed system is obtained.
[0020] Compared with the prior art, when the above stirring speed and time are used, a homogeneous mixed system can be obtained, and the uniform mixing of the components is ensured.
[0021] The third aspect of the present application provides the application of the HY capture agent in the acid regeneration of pickling wastewater.
[0022] Further, the HY capture agent can reduce the concentration of Fe element in the pickling wastewater, and the concentration of H + remains unchanged.
[0023] Compared with the prior art, the HY capture agent of the present application is applied to the pickling wastewater to precipitate heavy metal ions, and the acid is regenerated, so that an acid regeneration method is developed, and the removal rate of heavy metals and the retention rate of acid radicals are improved.
[0024] It should be understood that the "HY capture agent" described above is essentially a heavy metal ion capture agent (also referred to as a waste liquid capture agent), which is focused on removing heavy metal ions in the pickling waste liquid, and is also helpful for the regeneration of the acid, and does not change the H + concentration of the reagent in the pickling waste liquid. DETAILED DESCRIPTION
[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.
[0026] The pickling wastewater usually contains high concentration of acid, such as hydrochloric acid, sulfuric acid, nitric acid and the like, and heavy metal ions, such as iron, zinc, chromium, nickel and the like, and is a valuable resource that can be recycled. In the prior art, the acid in the wastewater is regenerated and reused by neutralization, evaporation, ion exchange and the like, so as to reduce the amount of new acid purchased and the cost of raw materials. However, these methods have defects of complicated process, high cost, incomplete removal of heavy metal ions and large loss of acid ions.
[0027] In order to overcome the above defects, in a first aspect, the embodiments of the present application provide a HY capture agent, which comprises the following components in percentage of mass of the HY capture agent: pH buffer 0.08% to 2.00%, adsorbent 5.0% to 12.0%, ion strength regulator 0.01% to 0.08%, acid root supplement 0.03% to 0.10%, chelating agent 0.01% to 0.03%, sulfamate 0.05% to 0.2% and appropriate amount of deionized water. It should be understood that the "appropriate amount" means that the mass percentage of the deionized water and the mass percentage of the other components are 100%. It should be understood that the "HY capture agent" described above is essentially a heavy metal ion capture agent, that is, it is focused on removing heavy metal ions in the pickling wastewater, and at the same time helps to regenerate the acid, and does not change the H + concentration of the reagent.
[0028] For example, a HY capture agent comprises the following components in percentage of mass of the HY capture agent: pH buffer 0.08%, adsorbent 5.0%, ion strength regulator 0.01%, acid root supplement 0.03%, chelating agent 0.01%, sulfamate 0.05% and deionized water 94.82%.
[0029] For example, a HY capture agent comprises the following components in percentage of mass of the HY capture agent: pH buffer 2.00%, adsorbent 12.0%, ion strength regulator 0.08%, acid root supplement 0.10%, chelating agent 0.03%, sulfamate 0.2% and deionized water 85.59%.
[0030] For example, a HY capture agent comprises the following components in percentage of mass of the HY capture agent: pH buffer 1.00%, adsorbent 8.0%, ion strength regulator 0.05%, acid root supplement 0.07%, chelating agent 0.02%, sulfamate 0.1% and deionized water 90.76%.
[0031] For example, a HY capture agent, the mass percentage of each component can be selected as any point value within the above range.
[0032] When the technical scheme is adopted, the heavy metal removal rate is greater than or equal to 99%, and the acid radical retention rate is greater than or equal to 95% through the stable four-mechanism of "pH adjustment-chelation-flocculation-acid radical", compared with the traditional neutralization method, the acid radical is avoided from being neutralized, the acid liquid supplement amount is reduced by more than 60%, and the treatment cost is reduced.
[0033] In some embodiments, the pH buffer includes acetate; the adsorbent includes metasilicate; the ionic strength regulator includes halide salt; the acid radical supplement includes sulfate; and the chelator includes aminopolycarboxylate.
[0034] Compared with the prior art, the metasilicate in the regenerant is hydrolyzed to generate silicic acid colloid, adsorbs heavy metal ions to form large particle flocs, and the silicate radical directly generates a difficult-to-dissolve silicate salt precipitate (such as Fe2(SiO3)3) with the heavy metal, solving the problem of poor selectivity of the traditional adsorbent; and in the traditional HY capture agent, the adsorbent is mostly a single-function adsorbent such as polyaluminum chloride or a strong base, but the former has poor selectivity for heavy metals, and the latter is easy to excessively neutralize the acid radical, consume H + , and the innovation of the metasilicate can break through the traditional single precipitation function, and simultaneously realize the functions of heavy metal precipitation, flocculation carrier, and weak base adjustment; the silicate radical generated by the hydrolysis directly forms a difficult-to-dissolve silicate salt precipitate with the heavy metal, the generated silicic acid colloid can adsorb small particles to form large flocs, and the weak alkalinity can finely adjust the pH to the optimal range of heavy metal precipitation; the high proportion of 5.0% to 12.0% strengthens the function of the metasilicate as the core functional carrier, and solves the problem of insufficient precipitation efficiency of the traditional low-dose metasilicate. - The halide salt increases the ionic strength of the solution, reduces the solubility of the heavy metal chloride, and at the same time maintains the Cl - concentration in the hydrochloric acid system, avoiding the consumption of the acid radical due to the precipitation reaction. The sulfate supplements SO4 2- , and stabilizes the acid radical concentration, and at the same time generates a sulfate precipitate with Ba 2+ , Pb 2+ , etc., to strengthen the heavy metal removal. The aminopolycarboxylate selectively chelates Cu 2+ , N 2+ , etc., avoids the formation of soluble salts with the acid radical, and is gradually released and precipitated in the metasilicate alkaline environment.
[0035] In some embodiments, the acetate includes sodium acetate; the metasilicate includes anhydrous sodium metasilicate; the halide salt includes sodium chloride; the sulfate includes sodium sulfate; and the aminopolycarboxylate includes sodium nitrilotriacetate.
[0036] When the technical scheme is adopted, sodium acetate is a weak acid salt, and the pH is fine-tuned by buffering to avoid excessive local alkalinity leading to neutralization of acid radicals. The silica colloid H2SiO3 generated by the hydrolysis of sodium metasilicate adsorbs heavy metal particles, and the silicate directly participates in the precipitation reaction, so that the flocculation efficiency is significantly improved. Sodium chloride provides a high concentration of Cl - , and reduces the solubility of heavy metal chlorides through the salt effect, while maintaining the acid radical concentration in the hydrochloric acid system. Sodium sulfate supplements SO4 2- , which can be used for sulfuric acid type pickling waste liquid, to stabilize the acid radical concentration and promote the precipitation of PbSO4 and other precipitates, avoiding the decrease of SO4 2- concentration in the regenerated acid. Sodium nitrilotriacetate selectively chelates Cr 3+ , Ni 2+ , Fe 2+ and other heavy metals, and the chelate dissociates in the slightly alkaline environment of the metasilicate, and the released metal ions combine with silicate to form a precipitate, effectively removing the heavy metal ions.
[0037] In some embodiments, the sulfamate salt comprises sodium sulfamate.
[0038] In a second aspect, an embodiment of the present application provides a preparation method of a HY trapping agent, which is applied to the preparation of the HY trapping agent and comprises the following processes:
[0039] Each component is weighed according to the HY trapping agent;
[0040] The adsorbent and deionized water are mixed and stirred to obtain a solution;
[0041] The pH buffer, ion strength regulator, acid radical supplement, chelating agent and sulfamate salt are sequentially added to the solution, and stirring and homogenization are performed to obtain the HY trapping agent.
[0042] Metasilicate is used as the adsorbent. Since metasilicate is easily soluble in water, it is first mixed with water to form a solution, then the salt of inorganic strong acid with high solubility (sulfate salt, halide salt) is dissolved, then the organic acid salt (acetate salt, sulfamate salt) is added, and finally the amino polycarboxylate salt with a small amount is added. This can reduce the mutual interference between components and ensure uniform dispersion. Homogenization treatment ensures uniform distribution of each component in the system. It should be understood that if there is a small amount of insoluble substance (such as impurities brought in by raw materials) in the solution, a 0.45 μm filter membrane can be used to filter out mechanical impurities and improve the purity of the regenerant.
[0043] In some embodiments, the stirring speed when the adsorbent and the deionized water are mixed and stirred is 200 rpm to 300 rpm, and the stirring time is 10 min to 15 min.
[0044] For example, the stirring speed can be selected from 200 rpm, 250 rpm, 300 rpm or any point value consisting of a range value, preferably 250 rpm to 300 rpm.
[0045] For example, the stirring time can be selected from 10 min, 12 min, 15 min or any point value consisting of a range value, preferably 12 min to 15 min.
[0046] In some embodiments, the pH buffer, the ionic strength regulator, the acid radical supplement, the chelating agent and the sulfamate are sequentially added to the solution, stirred at 200 rpm to 300 rpm for 1 h to 2 h, and then homogenized at 4000 rpm to 5000 rpm for 10 min to 15 min to obtain the HY capture agent.
[0047] For example, the stirring speed can be selected from 200 rpm, 250 rpm, 300 rpm or any point value consisting of a range value, preferably 250 rpm to 300 rpm.
[0048] For example, the stirring time can be selected from 1 h, 1.5 h, 2 h or any point value consisting of a range value, preferably 1.5 h to 2 h.
[0049] For example, the stirring speed can be selected from 200 rpm, 250 rpm, 300 rpm or any point value consisting of a range value, preferably 250 rpm to 300 rpm.
[0050] For example, the stirring time can be selected from 10 min, 12 min, 15 min or any point value consisting of a range value, preferably 12 min to 15 min.
[0051] When the above speed and time are used, a uniform mixing system can be obtained, and the components can be uniformly mixed.
[0052] In a third aspect, the embodiments of the present application provide an application of the HY capture agent in acid regeneration of pickling wastewater.
[0053] Further, the HY capture agent can reduce the concentration of Fe element in the pickling wastewater, and the concentration of H + The concentration remains unchanged.
[0054] The HY capture agent of the present application is applied to the pickling wastewater to precipitate heavy metal ions, and the acid is regenerated, a regeneration method of the acid is developed, and the removal rate of heavy metals and the retention rate of acid radical ions are improved.
[0055] In order to better illustrate the technical solutions of the present application, the following embodiments are provided. It should be understood that, unless specifically stated, the raw materials used in the embodiments are commercially available.
[0056] Example 1
[0057] An HY capture agent, comprising the following components in terms of mass percentage of the HY capture agent: sodium acetate 0.08%, anhydrous sodium metasilicate 5.0%, sodium chloride 0.01%, sodium sulfate 0.03%, sodium nitrilotriacetate 0.01%, sodium sulfamate 0.05%, and deionized water 94.82%.
[0058] The preparation process of the HY capture agent is as follows:
[0059] Each component is weighed according to the HY capture agent;
[0060] Sodium silicate and deionized water are mixed at 200 rpm for 10 min to obtain a solution;
[0061] Sodium acetate, sodium sulfate, sodium chloride, sodium nitrilotriacetate, and sodium sulfamate are sequentially added to the solution, which is stirred at 200 rpm for 1 h, and then homogenized at 4000 rpm for 10 min to obtain the HY capture agent.
[0062] Example 2
[0063] An HY capture agent, comprising the following components in terms of mass percentage of the HY capture agent: sodium acetate 2.00%, anhydrous sodium metasilicate 12.0%, sodium chloride 0.08%, sodium sulfate 0.10%, sodium nitrilotriacetate 0.03%, sodium sulfamate 0.2%, and deionized water 85.59%.
[0064] The preparation process of the HY capture agent is as follows:
[0065] Each component is weighed according to the HY capture agent;
[0066] Anhydrous sodium metasilicate and deionized water are mixed at 300 rpm for 15 min to obtain a solution;
[0067] Sodium acetate, sodium sulfate, sodium chloride, sodium nitrilotriacetate, and sodium sulfamate are sequentially added to the solution, which is stirred at 300 rpm for 2 h, and then homogenized at 5000 rpm for 15 min to obtain the HY capture agent.
[0068] Example 3
[0069] An HY capture agent, comprising the following components in terms of mass percentage of the HY capture agent: sodium acetate 1.00%, anhydrous sodium metasilicate 8.0%, sodium chloride 0.05%, sodium sulfate 0.07%, sodium nitrilotriacetate 0.02%, sodium sulfamate 0.1%, and deionized water 90.76%.
[0070] The preparation process of the HY capture agent is as follows:
[0071] Each component is weighed according to the HY capture agent;
[0072] Anhydrous sodium metasilicate and deionized water are mixed under 250 rpm stirring for 12 min to obtain a solution;
[0073] Sodium acetate, sodium sulfate, sodium chloride, sodium nitrilotriacetate, and sodium sulfamate are sequentially added to the solution, stirred at 250 rpm for 1.5 h, and then homogenized at 4500 rpm for 12 min to obtain the HY capture agent.
[0074] Comparative Example 1
[0075] Comparative Example 3 is compared with Example 3, and the difference is that an equal amount of polyaluminum chloride is used to replace sodium metasilicate, and the rest of the components and the preparation process remain unchanged.
[0076] Comparative Example 2
[0077] Comparative Example 3 is compared with Example 3, and the difference is that sodium sulfate is removed, and the mass fraction of anhydrous sodium metasilicate is increased to 8.07%, and the rest of the components and the preparation process remain unchanged.
[0078] Comparative Example 3
[0079] Comparative Example 3 is compared with Example 3, and the difference is that sodium sulfamate is removed, and the mass fraction of sodium sulfate is increased to 0.17%, and the rest of the components and the preparation process remain unchanged.
[0080] Comparative Example 4
[0081] Comparative Example 3 is compared with Example 3, and the difference is that sodium sulfate is removed, and the mass fraction of sodium sulfamate is increased to 0.17%, and the rest of the components and the preparation process remain unchanged.
[0082] Comparative Example 5
[0083] Comparative Example 3 is compared with Example 3, and the difference is that the amount of anhydrous sodium metasilicate is reduced to 2%, and the amount of deionized water is increased to 96.76%, and the rest of the components and the preparation process remain unchanged.
[0084] Performance test
[0085] 800 ml of steel pickling wastewater is used to determine the H + concentration and Fe 2+The concentration of the acid pickling waste liquid was then determined, and the acid pickling waste liquid was then evenly divided into 8 groups, and each group was added with the regenerant of Example 1 to Example 3 and Comparative Example 1 to Comparative Example 5, and the amount of addition was 1% of the total mass of the steel pickling waste liquid. Then the waste liquid added with the regenerant was passed through the recrystallized silicon carbide honeycomb ceramic membrane.
[0086] Heavy metal ion concentration test:
[0087] The Fe2+concentration before and after treatment was determined by inductively coupled plasma optical emission spectrometry (ICP-OES). 2+
[0088] Heavy metal ion removal rate: [(initial heavy metal ion concentration - treated heavy metal ion concentration) / initial acid ion concentration] x 100%.
[0089] Method for determining acid ion retention rate
[0090] Test object: acid ions H + in the pickling waste liquid.
[0091] The detection process is as follows:
[0092] Accurately transfer 25 mL of the waste liquid into a conical flask, and add 2 drops of methyl orange.
[0093] Titrate with a 15% NaOH standard solution (c 碱 ) until the indicator changes color and does not fade within half a minute, and record the volume of alkali consumed V 碱 .
[0094] Calculation: [H + ] = (c 碱 x V 碱 ) / V 废液
[0095] Retention rate calculation:
[0096] Retention rate = [(treated acid ion concentration / initial acid ion concentration)] x 100% (the acid ions contributed by the regenerant itself need to be deducted).
[0097] The determination results before treatment are shown in Table 1; Table 1
[0098] The determination results after treatment are shown in Table 2; Table 2
[0099] The various embodiments described in this specification are intended to be illustrative of the invention and do not limit the scope of the invention. Although specific embodiments have been described herein, they are not to be taken as the only embodiments of the invention. Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. For example, the scope of the invention includes various combinations of the features described herein. It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application cover modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.
Claims
1. A HY trapping agent, characterized in that, The HY trapping agent comprises the following components in percentage of the mass of the HY trapping agent: pH buffer 0.08%-2.00%, adsorbent 5.0%-12.0%, ionic strength regulator 0.01%-0.08%, acid radical supplement 0.03%-0.10%, chelating agent 0.01%-0.03%, sulfamate 0.05%-0.2%, and deionized water in an appropriate amount.
2. The HY trapping agent of claim 1, wherein, The pH buffer comprises acetate; and / or, The adsorbent comprises metasilicate; and / or, The ionic strength regulator comprises halide salt; and / or, The acid radical supplement comprises sulfate; and / or, The chelating agent comprises aminopolycarboxylate.
3. The HY trapping agent of claim 2, wherein, The acetate comprises at least one of sodium acetate, ammonium acetate, potassium acetate; and / or, The metasilicate comprises anhydrous sodium metasilicate; and / or, The halide salt comprises sodium chloride; and / or, The sulfate comprises sodium sulfate; and / or, The aminopolycarboxylate comprises sodium nitrilotriacetate.
4. The HY trapping agent according to any one of claims 1 to 3, characterized in that, The sulfamate comprises sodium sulfamate.
5. A method for preparing a HY trapping agent, which is applied to the preparation of the HY trapping agent according to any one of claims 1 to 4, characterized by, The process comprises the following steps: The HY trapping agent according to any one of claims 1-4 is weighed for each component; The adsorbent and the deionized water are mixed and stirred to obtain a solution; The pH buffer, the ionic strength regulator, the acid radical supplement, the chelating agent, and the sulfamate are sequentially added to the solution, and stirred and homogenized to obtain the HY trapping agent.
6. The method of claim 5, wherein the HY trapping agent is prepared by the steps of: The adsorbent and the deionized water are mixed and stirred at a speed of 200 rpm-300 rpm for 10 min-15 min.
7. The method for preparing a HY scavenging agent according to claim 5, characterized in that, After the acid radical supplement, the ionic strength regulator, the pH buffer, the sulfamate, and the chelating agent are sequentially added to the solution, the solution is stirred at 200 rpm-300 rpm for 1 h-2 h, and then homogenized at 4000 rpm-5000 rpm for 10 min-15 min to obtain a homogeneous mixed system.
8. Use of the HY trapping agent according to any one of claims 1-4 or prepared by the method according to any one of claims 5-7 in acid regeneration of pickling wastewater.
9. Use according to claim 8, characterized in that, The HY capture agent can reduce the concentration of Fe elements in the acid washing wastewater, H + The concentration remains unchanged.