Anti-scaling and anti-corrosion agent for preventing filter media caking in steel plants and its preparation method

Abstract

This invention relates to the field of scale inhibitor technology, and proposes a scale inhibitor and anti-corrosion treatment agent for preventing filter media caking in steel plants, and its preparation method. The scale inhibitor and anti-corrosion treatment agent for preventing filter media caking in steel plants comprises the following components in parts by weight: 5-10 parts of polycarboxylic acid compound, 8-12 parts of polyepoxysuccinic acid, 2-4 parts of sodium polynaphthalene sulfonate, 3-5 parts of chitosan, and 35-55 parts of solvent. This technical solution solves the problem of insufficient scale inhibition effect in related technologies for preventing filter media caking in steel plants.

Description

Technical Field

[0001] This invention relates to the field of scale inhibitor technology, specifically to a scale inhibitor and corrosion inhibitor for preventing filter media caking in steel plants and its preparation method. Background Technology

[0002] In the context of rapid industrial technological development, water treatment in metallurgical and steel plants faces numerous challenges, among which filter media caking severely impacts production. To address this issue, steel plants typically use scale and corrosion inhibitors, but currently available agents generally suffer from insufficient scale inhibition performance.

[0003] From the perspective of the actual needs of water treatment in steel plants, the water environment is complex, with diverse mineral compositions and high levels of calcium and magnesium ions. Under such water conditions, calcium and magnesium ion crystals easily form, which adhere to the surface of the filter media, gradually leading to caking. Existing scale and corrosion inhibitors are insufficient in their ability to inhibit filter media caking when dealing with such complex water conditions. Their formulations lack specificity and cannot accurately chelate and disperse the minerals in the water to prevent crystallization and precipitation. Therefore, they cannot fundamentally solve the problem of filter media caking, affecting the permeability of the filter layer and consequently impacting the normal production of the blast furnace.

[0004] Therefore, there is a need for a scale inhibitor and corrosion inhibitor with excellent scale inhibition effect for steel plants to prevent filter media from caking, so as to effectively inhibit mineral scaling in water and extend the service life of equipment. Summary of the Invention

[0005] This invention proposes a scale inhibitor and corrosion inhibitor for preventing filter media caking in steel plants and its preparation method, which solves the problem of insufficient scale inhibition effect of scale inhibitors and corrosion inhibitors for preventing filter media caking in steel plants in related technologies.

[0006] The technical solution of the present invention is as follows:

[0007] This invention proposes a scale inhibitor and corrosion inhibitor for preventing filter media caking in steel plants, comprising the following components by weight: 5-10 parts of polycarboxylic acid compound, 8-12 parts of polyepoxysuccinic acid, 2-4 parts of sodium polynaphthalene sulfonate, 3-5 parts of chitosan, and 35-55 parts of solvent.

[0008] As a further technical solution, the solvent includes water; the chitosan includes quaternized chitosan and / or carboxylated chitosan.

[0009] As a further technical solution, when the chitosan is quaternized chitosan and carboxylated chitosan, the mass ratio of the quaternized chitosan to the carboxylated chitosan is 1:3 to 3:1.

[0010] In this invention, when the chitosan is quaternized chitosan and carboxylated chitosan, and the mass ratio of quaternized chitosan to carboxylated chitosan is 1:3 to 3:1, the corrosion inhibition effect of the scale inhibitor and corrosion inhibitor is improved when combined with sodium polynaphthalene sulfonate.

[0011] In this invention, the active groups of each component in the scale inhibitor and corrosion inhibitor can form stable complexes with metal ions. These complexes can be adsorbed on the metal surface to form an organic protective film; on the other hand, they can complex with scale-forming ions such as calcium and magnesium in the water, preventing scale-forming ions from forming scale deposits on the metal surface, thus achieving a dual effect of scale inhibition and corrosion inhibition.

[0012] As a further technical solution, the polycarboxylic acid compound includes one or both of sodium polyacrylate and sodium polymethacrylate.

[0013] As a further technical solution, the following components by weight are also included: 1 to 4 parts of aminotrimethylenephosphonic acid.

[0014] In this invention, aminotrimethylenephosphonic acid is also added as a component of the scale inhibitor and corrosion inhibitor, which works synergistically with chitosan and sodium polynaphthalene sulfonate to further improve the corrosion inhibition effect of the scale inhibitor and corrosion inhibitor.

[0015] This invention also proposes a method for preparing the scale inhibitor and corrosion inhibitor for preventing filter media caking in steel plants, comprising the following steps:

[0016] S1. The polycarboxylic acid compound, polyepoxysuccinic acid and solvent are mixed for the first time to obtain a mixture;

[0017] S2. Add sodium polynaphthalene sulfonate and chitosan to the mixture for a second mixing to obtain a scale inhibitor and corrosion inhibitor.

[0018] This invention also proposes a method for preparing the scale inhibitor and corrosion inhibitor for preventing filter media caking in steel plants, comprising the following steps:

[0019] S1. The polycarboxylic acid compound, polyepoxysuccinic acid and solvent are mixed for the first time to obtain a mixture;

[0020] S2. Add sodium polynaphthalene sulfonate, chitosan, and aminotrimethylene phosphonic acid to the mixture for a second mixing to obtain a scale inhibitor and corrosion inhibitor.

[0021] As a further technical solution, the temperature of the first mixing is 40~50℃, the rotation speed is 300~500r / min, and the time is 45~65min.

[0022] In this invention, maintaining a mixing speed of 300-500 r / min and a mixing time of 45-65 min during the first mixing stage helps ensure that the polycarboxylic acid compounds, polyepoxysuccinic acid, and solvent are more fully dispersed, avoiding situations where the local concentration is too high or too low. Too slow a mixing speed results in poor mixing and uneven distribution of components; too fast a speed may generate excessive shear force, damaging the structure of some components. Under the process parameters of this invention, a high-performance scale and corrosion inhibitor for preventing filter media caking in steel plants can be prepared, effectively preventing filter media caking and ensuring the stable operation of the steel plant's water system.

[0023] As a further technical solution, the temperature of the second mixing is 35~45℃, the rotation speed is 150~300r / min, and the time is 30~50min.

[0024] In this invention, the mixing speed and time are reduced during the second mixing stage. This avoids over-stirring and ensures further uniform mixing and reaction of the components while saving energy and improving production efficiency. The use of staged and differentiated mixing parameters ensures the high-quality preparation of the scale and corrosion inhibitor, effectively improving its performance in preventing filter media caking and inhibiting scale and corrosion.

[0025] The present invention also proposes the application of the scale inhibitor and corrosion inhibitor for preventing filter media caking in steel plants, or the scale inhibitor and corrosion inhibitor prepared by the preparation method, in preventing filter media caking in steel plants.

[0026] The working principle and beneficial effects of this invention are as follows:

[0027] In this invention, polycarboxylic acid compounds and polyepoxysuccinic acid are used as the base components, and sodium polynaphthalene sulfonate and chitosan are added to form a compound to obtain a scale inhibitor and corrosion inhibitor.

[0028] Polycarboxylic acid compounds and polyepoxysuccinic acid can chelate with scale-forming metal ions, preventing them from depositing and crystallizing on the filter media surface, thereby achieving scale inhibition.

[0029] The combination of sodium polynaphthalene sulfonate and chitosan has a strong ability to disperse and suspend impurities and dirt in water, effectively preventing dirt from adhering and accumulating on the surface of filter media. It synergistically enhances the inhibition effect on filter media caking, and at the same time, it can prevent the formation of bioscale, ultimately improving the scale inhibition effect of the scale inhibitor and corrosion inhibitor. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] In the following examples, the weight-average molecular weight of polymethacrylic acid is 50,000;

[0032] Sodium polyacrylate has a weight-average molecular weight of 1 million.

[0033] Sodium polynaphthalene sulfonate was purchased from Jiang Hongxin Dyeing and Chemical Materials Co., Ltd.

[0034] The molecular weight of carboxylated chitosan is 200K, and the degree of carboxylation is 80%.

[0035] The molecular weight of quaternized chitosan is 200K, and the degree of substitution is 40%.

[0036] Example 1

[0037] A scale and corrosion inhibitor for preventing filter media caking in steel plants, comprising the following components by weight: 5 parts sodium polymethacrylate, 8 parts polyepoxysuccinic acid, 2 parts sodium polynaphthalene sulfonate, 3 parts carboxylated chitosan, and 35 parts water.

[0038] A method for preparing a scale inhibitor and corrosion inhibitor for preventing filter media caking in steel plants includes the following steps:

[0039] S1. Sodium polymethacrylate, polyepoxysuccinic acid and solvent are mixed at 40°C and 500 r / min for 45 min to obtain a mixture;

[0040] S2. Add sodium polynaphthalene sulfonate and carboxylated chitosan to the mixture and mix at 35°C and 300 r / min for 30 min to obtain a scale inhibitor and corrosion inhibitor.

[0041] Example 2

[0042] A scale and corrosion inhibitor for preventing filter media caking in steel plants, comprising the following components by weight: 10 parts sodium polyacrylate, 12 parts polyepoxysuccinic acid, 4 parts sodium polynaphthalene sulfonate, 5 parts carboxylated chitosan, and 55 parts water.

[0043] A method for preparing a scale inhibitor and corrosion inhibitor for preventing filter media caking in steel plants includes the following steps:

[0044] S1. Sodium polyacrylate, polyepoxysuccinic acid and solvent are mixed at 50°C and 300 r / min for 45 min to obtain a mixture;

[0045] S2. Add sodium polynaphthalene sulfonate and carboxylated chitosan to the mixture and mix at 45°C and 150 r / min for 50 min to obtain a scale inhibitor and corrosion inhibitor.

[0046] Example 3

[0047] A scale and corrosion inhibitor for preventing filter media caking in steel plants, comprising the following components by weight: 8 parts sodium polyacrylate, 10 parts polyepoxysuccinic acid, 3 parts sodium polynaphthalene sulfonate, 4 parts carboxylated chitosan, and 50 parts water.

[0048] A method for preparing a scale inhibitor and corrosion inhibitor for preventing filter media caking in steel plants includes the following steps:

[0049] S1. Sodium polyacrylate, polyepoxysuccinic acid and solvent are mixed at 55°C and 400 r / min for 60 min to obtain a mixture;

[0050] S2. Add sodium polynaphthalene sulfonate and carboxylated chitosan to the mixture and mix at 40°C and 200 r / min for 40 min to obtain a scale inhibitor and corrosion inhibitor.

[0051] Example 4

[0052] The only difference between this embodiment and Embodiment 3 is that carboxylated chitosan is replaced with quaternized chitosan.

[0053] Example 5

[0054] A scale and corrosion inhibitor for preventing filter media caking in steel plants, comprising the following components by weight: 8 parts sodium polyacrylate, 10 parts polyepoxysuccinic acid, 3 parts sodium polynaphthalene sulfonate, 3.2 parts carboxylated chitosan, 0.8 parts quaternized chitosan, and 50 parts water.

[0055] A method for preparing a scale inhibitor and corrosion inhibitor for preventing filter media caking in steel plants includes the following steps:

[0056] S1. Sodium polyacrylate, polyepoxysuccinic acid and solvent are mixed at 55°C and 400 r / min for 60 min to obtain a mixture;

[0057] S2. Add sodium polynaphthalene sulfonate, carboxylated chitosan, and quaternized chitosan to the mixture and mix at 40°C and 200 r / min for 40 min to obtain a scale inhibitor and corrosion inhibitor.

[0058] Example 6

[0059] The difference between this embodiment and embodiment 5 lies only in the scale and corrosion inhibitor used to prevent filter media from caking in steel plants, which includes the following components by weight: 8 parts sodium polyacrylate, 10 parts polyepoxysuccinic acid, 3 parts sodium polynaphthalene sulfonate, 0.8 parts carboxylated chitosan, 3.2 parts quaternized chitosan, and 50 parts water.

[0060] Example 7

[0061] The difference between this embodiment and embodiment 5 lies only in the scale and corrosion inhibitor used to prevent filter media from caking in steel plants, which includes the following components by weight: 8 parts sodium polyacrylate, 10 parts polyepoxysuccinic acid, 3 parts sodium polynaphthalene sulfonate, 3 parts carboxylated chitosan, 1 part quaternized chitosan, and 50 parts water.

[0062] Example 8

[0063] The difference between this embodiment and embodiment 5 lies only in the scale and corrosion inhibitor used to prevent filter media from caking in steel plants, which includes the following components by weight: 8 parts sodium polyacrylate, 10 parts polyepoxysuccinic acid, 3 parts sodium polynaphthalene sulfonate, 1 part carboxylated chitosan, 3 parts quaternized chitosan, and 50 parts water.

[0064] Example 9

[0065] A scale and corrosion inhibitor for preventing filter media caking in steel plants, comprising the following components by weight: 8 parts sodium polyacrylate, 10 parts polyepoxysuccinic acid, 3 parts sodium polynaphthalene sulfonate, 1 part carboxylated chitosan, 3 parts quaternized chitosan, 1 part aminotrimethylene phosphonic acid, and 50 parts water.

[0066] A method for preparing a scale inhibitor and corrosion inhibitor for preventing filter media caking in steel plants includes the following steps:

[0067] S1. Sodium polyacrylate, polyepoxysuccinic acid and solvent are mixed at 55°C and 400 r / min for 60 min to obtain a mixture;

[0068] S2. Add sodium polynaphthalene sulfonate, carboxylated chitosan, quaternized chitosan, and aminotrimethylene phosphonic acid to the mixture and mix for 40 min at 40°C and 200 r / min to obtain a scale inhibitor and corrosion inhibitor.

[0069] Example 10

[0070] The difference between this embodiment and embodiment 9 lies only in the scale and corrosion inhibitor used to prevent filter media from caking in steel plants, which includes the following components by weight: 8 parts sodium polyacrylate, 10 parts polyepoxysuccinic acid, 3 parts sodium polynaphthalene sulfonate, 1 part carboxylated chitosan, 3 parts quaternized chitosan, 4 parts aminotrimethylene phosphonic acid, and 50 parts water.

[0071] Comparative Example 1

[0072] The only difference between this comparative example and Example 3 is that sodium polynaphthalene sulfonate is replaced with carboxylated chitosan.

[0073] Comparative Example 2

[0074] The only difference between this comparative example and Example 3 is that carboxylated chitosan is replaced with sodium polynaphthalene sulfonate.

[0075] Comparative Example 3

[0076] A scale and corrosion inhibitor for preventing filter media caking in steel plants, comprising the following components by weight: 8 parts sodium polyacrylate, 10 parts polyepoxysuccinic acid, 1 part aminotrimethylenephosphonic acid, and 50 parts water.

[0077] A method for preparing a scale inhibitor and corrosion inhibitor for preventing filter media caking in steel plants includes the following steps:

[0078] S1. Sodium polyacrylate, polyepoxysuccinic acid and solvent are mixed at 55°C and 400 r / min for 60 min to obtain a mixture;

[0079] S2. Add aminotrimethylene phosphonic acid to the mixture and mix at 40°C and 200 r / min for 40 min to obtain a scale inhibitor and corrosion inhibitor.

[0080] Experimental Example 1

[0081] The scale inhibitors and corrosion inhibitors prepared in Examples 1-4 and Comparative Examples 1-2 were subjected to a rotating plate test on Q255 steel sheets. The experimental conditions were: Ca 2＋ Concentration 4000 mg / L, Mg 2＋ Concentration 8000 mg / L, SO4 2- The scale inhibition rate of the scale inhibitor was measured after the concentration was 6000 mg / L, the pH value was 9, the concentration of the scale inhibitor and corrosion inhibitor was 8 mg / L, the temperature was 70℃, and the temperature was constant for 120 h. The results are shown in Table 1 below.

[0082] Table 1 Scale Inhibition Rate Test Results

[0083]

[0084] Experimental Example 2

[0085] The scale inhibitors and corrosion inhibitors prepared in Examples 3-10 and Comparative Example 3 were tested for corrosion inhibition rate (test method is the same as in Experiment 1), and the results are shown in Table 2 below.

[0086] Table 2 Corrosion Inhibition Rate Test Results

[0087]

[0088] Compared with Comparative Example 3 and Examples 3-4, the scale inhibitors and corrosion inhibitors prepared in Examples 7-10 had a higher corrosion inhibition rate, reaching over 98%. This indicates that the combination of chitosan and sodium polynaphthalene sulfonate, with chitosan being quaternized chitosan and carboxylated chitosan in a mass ratio of 1:3 to 3:1, and the further addition of aminotrimethylene phosphonic acid as a component of the scale inhibitor and corrosion inhibitor, improved the corrosion inhibition effect of the scale inhibitor and corrosion inhibitor.

[0089] Experimental Example 3

[0090] A water sample was taken from a steel plant. The main water quality indicators were chloride ion 50 mg / L, hardness 7 mmol / L, and alkalinity 4 mmol / L. The corrosion inhibition performance was tested according to GB / T18175-2014 "Determination of Corrosion Inhibition Performance of Water Treatment Agents - Rotary Coating Method". The dosage of scale inhibitor and corrosion inhibitor was 10 ppm. The results are shown in Table 3.

[0091] Table 3 Corrosion Inhibition Rate Test Results

[0092]

[0093] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A scale inhibitor and corrosion inhibitor for preventing filter media caking in steel plants, characterized in that, The product comprises the following components in parts by weight: 5-10 parts of polycarboxylic acid compound, 8-12 parts of polyepoxysuccinic acid, 2-4 parts of sodium polynaphthalene sulfonate, 3-5 parts of chitosan, 35-55 parts of solvent, and 1-4 parts of aminotrimethylenephosphonic acid. The chitosan is quaternized chitosan and carboxylated chitosan, and the mass ratio of quaternized chitosan to carboxylated chitosan is 1:3 to 3:

1.

2. The scale inhibitor and corrosion inhibitor for preventing filter media caking in steel plants according to claim 1, characterized in that, The polycarboxylic acid compounds include one or both of sodium polyacrylate and sodium polymethacrylate.

3. The method for preparing the scale inhibitor and corrosion inhibitor for preventing filter media caking in steel plants according to claim 1, characterized in that, Includes the following steps: S1. The polycarboxylic acid compound, polyepoxysuccinic acid and solvent are mixed for the first time to obtain a mixture; S2. Add sodium polynaphthalene sulfonate, chitosan, and aminotrimethylene phosphonic acid to the mixture for a second mixing to obtain a scale inhibitor and corrosion inhibitor.

4. The method for preparing the scale inhibitor and corrosion inhibitor for preventing filter media caking in steel plants according to claim 3, characterized in that, The temperature of the first mixing is 40~50℃, the rotation speed is 300~500r / min, and the time is 45~65min.

5. The preparation method of the scale inhibitor and corrosion inhibitor for preventing filter media caking in steel plants according to claim 3, characterized in that, The second mixing temperature is 35~45℃, the rotation speed is 150~300r / min, and the time is 30~50min.

6. The scale inhibitor and corrosion inhibitor for preventing filter media caking in steel plants according to any one of claims 1 to 2, or the scale inhibitor and corrosion inhibitor prepared by the preparation method according to any one of claims 3 to 5, is used in preventing filter media caking in steel plants.

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