Scale and corrosion inhibition treatment agent for preventing filter material hardening in steel plant and preparation method of scale and corrosion inhibition treatment agent

Abstract

The invention relates to the technical field of scale inhibitors, and provides a scale and corrosion preventing treatment agent for preventing filter material hardening in steel plants and a preparation method thereof.The scale and corrosion preventing treatment agent for preventing filter material hardening in steel plants is prepared from, by weight, 5-10 parts of polycarboxylic acid compounds, 8-12 parts of polyepoxysuccinic acid, 2-4 parts of sodium poly [(naphthaleneformaldehyde) sulfonate], 3-5 parts of chitosan and 35-55 parts of solvent. According to the technical scheme, the problem of insufficient scale inhibition effect of the scale inhibition and corrosion prevention treatment agent for preventing the filter material from hardening in the steel plant in the related technology is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of scale inhibitors, and particularly to a scale and corrosion inhibitor for preventing filter media caking in steel plants and a preparation method thereof. Background Art

[0002] Under the background of the rapid development of today's industrial technology, the water treatment work in metallurgical steel plants faces many challenges, among which the problem of filter media caking seriously affects production. To solve this problem, steel plants usually use scale and corrosion inhibitors, but such inhibitors on the market generally have insufficient scale inhibition performance.

[0003] From the actual needs of water treatment in steel plants, the water quality environment is complex, the mineral components in the water are diverse, and the contents of calcium and magnesium ions are relatively high. Under such water quality conditions, calcium and magnesium ion crystals are easily formed, and these crystals will adhere to the surface of the filter media, gradually leading to filter media caking. Existing scale and corrosion inhibitors are insufficient in inhibiting filter media caking when dealing with such complex water quality, lack pertinence in the formula, and cannot accurately chelate and disperse the minerals in the water to prevent their crystallization and precipitation, thus unable to fundamentally solve the problem of filter media caking, which affects the water permeability of the filter layer and further affects the normal production of the blast furnace.

[0004] Therefore, a scale and corrosion inhibitor for preventing filter media caking in steel plants with excellent scale inhibition effect is needed to efficiently inhibit the scaling of minerals in water and extend the service life of equipment. Summary of the Invention

[0005] The present invention provides a scale and corrosion inhibitor for preventing filter media caking in steel plants and a preparation method thereof, which solves the problem of insufficient scale inhibition effect of the scale and corrosion inhibitor for preventing filter media caking in steel plants in the related art.

[0006] The technical solution of the present invention is as follows: The present invention provides a scale and corrosion inhibitor for preventing filter media caking in steel plants, which comprises the following components in parts by weight: 5 - 10 parts of polycarboxylic acid compounds, 8 - 12 parts of polyepoxysuccinic acid, 2 - 4 parts of sodium poly(naphthalene formaldehyde sulfonate), 3 - 5 parts of chitosan, and 35 - 55 parts of solvent.

[0007] As a further technical solution, the solvent comprises water; the chitosan comprises quaternized chitosan and / or carboxylated chitosan.

[0008] 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 - 3:1.

[0009] In the present invention, when the chitosan is quaternized chitosan and carboxylated chitosan, and the mass ratio of the quaternized chitosan to the carboxylated chitosan is 1:3 to 3:1, together with sodium polynaphthalene formaldehyde sulfonate, the corrosion inhibition effect of the scale and corrosion inhibitor is improved.

[0010] In the present invention, the active groups of the components in the scale and corrosion inhibitor can form stable complexes with metal ions. On the one hand, these complexes can adsorb 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 water to prevent the scale-forming ions from forming scale and depositing on the metal surface, thereby achieving the dual functions of scale inhibition and corrosion inhibition.

[0011] As a further technical solution, the polycarboxylic acid compound includes one or two of sodium polyacrylate and sodium polymethacrylate.

[0012] As a further technical solution, it further includes the following components in parts by weight: 1 to 4 parts of aminotrimethylenephosphonic acid.

[0013] In the present invention, aminotrimethylenephosphonic acid is also added as a component of the scale and corrosion inhibitor, which synergizes with chitosan and sodium polynaphthalene formaldehyde sulfonate to further improve the corrosion inhibition effect of the scale and corrosion inhibitor.

[0014] The present invention also provides a preparation method of the scale and corrosion inhibitor for preventing filter caking in a steel plant, including the following steps: S1. First mix the polycarboxylic acid compound, polyepoxysuccinic acid and a solvent to obtain a mixture; S2. Add sodium polynaphthalene formaldehyde sulfonate and chitosan to the mixture for a second mixing to obtain the scale and corrosion inhibitor.

[0015] The present invention also provides a preparation method of the scale and corrosion inhibitor for preventing filter caking in a steel plant, including the following steps: S1. First mix the polycarboxylic acid compound, polyepoxysuccinic acid and a solvent to obtain a mixture; S2. Add sodium polynaphthalene formaldehyde sulfonate, chitosan and aminotrimethylenephosphonic acid to the mixture for a second mixing to obtain the scale and corrosion inhibitor.

[0016] As a further technical solution, the temperature of the first mixing is 40 to 50 °C, the rotation speed is 300 to 500 r / min, and the time is 45 to 65 min.

[0017] In the present invention, the rotation speed of the first mixing is maintained at 300 - 500 r / min, and the time is set to 45 - 65 min, which helps to ensure that the polycarboxylic acid compound, polyepoxysuccinic acid and the solvent can be more fully dispersed, avoiding the situation of too high or too low local concentration. If the rotation speed is too slow, the mixing effect is poor, and it is easy to cause uneven distribution of each component; if the rotation speed is too fast, excessive shear force may be generated, damaging the structure of some components. Under the process parameters of the present invention, a scale and corrosion inhibitor for preventing filter caking in steel plants with excellent performance can be prepared, effectively preventing filter caking and ensuring the stable operation of the water system in the steel plant.

[0018] As a further technical solution, the temperature of the second mixing is 35 - 45 °C, the rotation speed is 150 - 300 r / min, and the time is 30 - 50 min.

[0019] In the present invention, the rotation speed and time of the second mixing are reduced. On the one hand, it is to avoid overmixing. On the other hand, while ensuring the further uniform mixing and reaction of each component, it can save energy and improve production efficiency. By adopting staged and differentiated mixing parameters, the high-quality preparation of the scale and corrosion inhibitor is ensured, effectively improving the performance of preventing filter caking and scale and corrosion inhibition.

[0020] The present invention also proposes the application of the scale and corrosion inhibitor for preventing filter caking in steel plants or the scale and corrosion inhibitor prepared by the preparation method in preventing filter caking in steel plants.

[0021] The working principle and beneficial effects of the present invention are as follows: In the present invention, based on polycarboxylic acid compounds and polyepoxysuccinic acid, sodium polynaphthalene formaldehyde sulfonate and chitosan are added for compounding to obtain a scale and corrosion inhibitor.

[0022] Polycarboxylic acid compounds and polyepoxysuccinic acid can chelate with scale-forming metal ions, preventing them from depositing and crystallizing on the surface of the filter material, thereby achieving scale inhibition.

[0023] Sodium polynaphthalene formaldehyde sulfonate and chitosan are compounded, which have strong dispersion and suspension ability for impurities and dirt in water, can effectively prevent dirt from adhering and accumulating on the surface of the filter material, synergistically enhance the inhibitory effect on filter caking, and at the same time, can prevent the generation of biological scale, ultimately improving the scale inhibition effect of the scale and corrosion inhibitor. Specific Embodiments

[0024] Next, in conjunction with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0025] In the following embodiments, the weight-average molecular weight of polymethacrylic acid is 50,000; The weight-average molecular weight of sodium polyacrylate is 1,000,000; Sodium polynaphthalene formaldehyde sulfonate is purchased from Jianghongxin Dyeing Chemical Materials Co., Ltd.; The molecular weight of carboxylated chitosan is 200K, and the degree of carboxylation is 80%; The molecular weight of quaternized chitosan is 200K, and the degree of substitution is 40%.

[0026] Example 1 The scale and corrosion inhibitor for preventing filter material caking in steel plants includes the following components in parts by weight: 5 parts of sodium polymethacrylate, 8 parts of polyepoxysuccinic acid, 2 parts of sodium polynaphthalene formaldehyde sulfonate, 3 parts of carboxylated chitosan, and 35 parts of water; The preparation method of the scale and corrosion inhibitor for preventing filter material caking in steel plants includes the following steps: S1. Mix sodium polymethacrylate, polyepoxysuccinic acid and a solvent at 40 °C and a rotation speed of 500 r / min for 45 min to obtain a mixture; S2. Add sodium polynaphthalene formaldehyde sulfonate and carboxylated chitosan to the mixture and mix at 35 °C and a rotation speed of 300 r / min for 30 min to obtain the scale and corrosion inhibitor.

[0027] Example 2 The scale and corrosion inhibitor for preventing filter material caking in steel plants includes the following components in parts by weight: 10 parts of sodium polyacrylate, 12 parts of polyepoxysuccinic acid, 4 parts of sodium polynaphthalene formaldehyde sulfonate, 5 parts of carboxylated chitosan, and 55 parts of water; The preparation method of the scale and corrosion inhibitor for preventing filter material caking in steel plants includes the following steps: S1. Mix sodium polyacrylate, polyepoxysuccinic acid and a solvent at 50 °C and a rotation speed of 300 r / min for 45 min to obtain a mixture; S2. Add sodium polynaphthalene formaldehyde sulfonate and carboxylated chitosan to the mixture and mix at 45 °C and a rotation speed of 150 r / min for 50 min to obtain the scale and corrosion inhibitor.

[0028] Example 3 Scale and corrosion inhibitor for preventing filter material caking in steel mills, comprising the following components in parts by weight: 8 parts of sodium polyacrylate, 10 parts of polyepoxysuccinic acid, 3 parts of sodium polynaphthalene formaldehyde sulfonate, 4 parts of carboxymethyl chitosan, and 50 parts of water; Preparation method of scale and corrosion inhibitor for preventing filter material caking in steel mills, comprising the following steps: S1. Mix sodium polyacrylate, polyepoxysuccinic acid and a solvent at 55°C and a rotation speed of 400 r / min for 60 min to obtain a mixture; S2. Add sodium polynaphthalene formaldehyde sulfonate and carboxymethyl chitosan to the mixture, and mix at 40°C and a rotation speed of 200 r / min for 40 min to obtain the scale and corrosion inhibitor.

[0029] Example 4 The difference between this example and Example 3 is only that carboxymethyl chitosan is replaced by quaternized chitosan.

[0030] Example 5 Scale and corrosion inhibitor for preventing filter material caking in steel mills, comprising the following components in parts by weight: 8 parts of sodium polyacrylate, 10 parts of polyepoxysuccinic acid, 3 parts of sodium polynaphthalene formaldehyde sulfonate, 3.2 parts of carboxymethyl chitosan, 0.8 part of quaternized chitosan, and 50 parts of water; Preparation method of scale and corrosion inhibitor for preventing filter material caking in steel mills, comprising the following steps: S1. Mix sodium polyacrylate, polyepoxysuccinic acid and a solvent at 55°C and a rotation speed of 400 r / min for 60 min to obtain a mixture; S2. Add sodium polynaphthalene formaldehyde sulfonate, carboxymethyl chitosan and quaternized chitosan to the mixture, and mix at 40°C and a rotation speed of 200 r / min for 40 min to obtain the scale and corrosion inhibitor.

[0031] Example 6 The difference between this example and Example 5 is only that the scale and corrosion inhibitor for preventing filter material caking in steel mills comprises the following components in parts by weight: 8 parts of sodium polyacrylate, 10 parts of polyepoxysuccinic acid, 3 parts of sodium polynaphthalene formaldehyde sulfonate, 0.8 part of carboxymethyl chitosan, 3.2 parts of quaternized chitosan, and 50 parts of water.

[0032] Example 7 The difference between this example and Example 5 is only that the scale and corrosion inhibitor for preventing filter material caking in steel mills comprises the following components in parts by weight: 8 parts of sodium polyacrylate, 10 parts of polyepoxysuccinic acid, 3 parts of sodium polynaphthalene formaldehyde sulfonate, 3 parts of carboxymethyl chitosan, 1 part of quaternized chitosan, and 50 parts of water.

[0033] Example 8 The difference between this example and Example 5 is only in the scale inhibitor and corrosion inhibitor for preventing filter material caking in the steel mill, which includes the following components in parts by weight: 8 parts of sodium polyacrylate, 10 parts of polyepoxysuccinic acid, 3 parts of sodium polynaphthalene formaldehyde sulfonate, 1 part of carboxymethyl chitosan, 3 parts of quaternized chitosan, and 50 parts of water.

[0034] Example 9 The scale inhibitor and corrosion inhibitor for preventing filter material caking in the steel mill includes the following components in parts by weight: 8 parts of sodium polyacrylate, 10 parts of polyepoxysuccinic acid, 3 parts of sodium polynaphthalene formaldehyde sulfonate, 1 part of carboxymethyl chitosan, 3 parts of quaternized chitosan, 1 part of aminotrimethylenephosphonic acid, and 50 parts of water; The preparation method of the scale inhibitor and corrosion inhibitor for preventing filter material caking in the steel mill includes the following steps: S1. Mix sodium polyacrylate, polyepoxysuccinic acid and the solvent at 55 °C and a rotation speed of 400 r / min for 60 min to obtain a mixture; S2. Add sodium polynaphthalene formaldehyde sulfonate, carboxymethyl chitosan, quaternized chitosan, and aminotrimethylenephosphonic acid to the mixture and mix at 40 °C and a rotation speed of 200 r / min for 40 min to obtain the scale inhibitor and corrosion inhibitor.

[0035] Example 10 The difference between this example and Example 9 is only in the scale inhibitor and corrosion inhibitor for preventing filter material caking in the steel mill, which includes the following components in parts by weight: 8 parts of sodium polyacrylate, 10 parts of polyepoxysuccinic acid, 3 parts of sodium polynaphthalene formaldehyde sulfonate, 1 part of carboxymethyl chitosan, 3 parts of quaternized chitosan, 4 parts of aminotrimethylenephosphonic acid, and 50 parts of water.

[0036] Comparative Example 1 The difference between this comparative example and Example 3 is only that sodium polynaphthalene formaldehyde sulfonate is replaced by carboxymethyl chitosan.

[0037] Comparative Example 2 The difference between this comparative example and Example 3 is only that carboxymethyl chitosan is replaced by sodium polynaphthalene formaldehyde sulfonate.

[0038] Comparative Example 3 The scale inhibitor and corrosion inhibitor for preventing filter material caking in the steel mill includes the following components in parts by weight: 8 parts of sodium polyacrylate, 10 parts of polyepoxysuccinic acid, 1 part of aminotrimethylenephosphonic acid, and 50 parts of water; The preparation method of the scale inhibitor and corrosion inhibitor for preventing filter material caking in the steel mill includes the following steps: S1. Mix sodium polyacrylate, polyepoxysuccinic acid and the solvent at 55 °C and a rotation speed of 400 r / min for 60 min to obtain a mixture; S2. Add aminotrimethylenephosphonic acid to the mixture and mix at 40 °C and a rotation speed of 200 r / min for 40 min to obtain the scale and corrosion inhibitor treatment agent.

[0039] Experimental Example 1 Perform a rotating coupon test on the Q255 steel sheets with the scale and corrosion inhibitor treatment agents prepared in Examples 1-4 and Comparative Examples 1-2 respectively: The experimental conditions are Ca 2＋ concentration of 4000 mg / L, Mg 2＋ concentration of 8000 mg / L, SO4 2- concentration of 6000 mg / L, pH value of 9, the addition concentration of the scale and corrosion inhibitor treatment agent is 8 mg / L, the temperature is 70 °C, and after constant temperature for 120 h, measure the scale inhibition rate of the scale and corrosion inhibitor treatment agent. The results are shown in Table 1 below.

[0040] Table 1 Scale Inhibition Rate Test Results

[0041] Experimental Example 2 Perform a corrosion inhibition rate test on the scale and corrosion inhibitor treatment agents prepared in Examples 3-10 and Comparative Example 3 respectively (the test method is the same as that in Experimental Example 1). The results are shown in Table 2 below.

[0042] Table 2 Corrosion Inhibition Rate Test Results

[0043] Compared with Comparative Example 3 and Examples 3-4, the corrosion inhibition rate of the scale and corrosion inhibitor treatment agent prepared in Examples 5-10 is higher, reaching more than 98%, indicating that the compounding of chitosan and sodium polynaphthalene sulfonate formaldehyde condensate, where chitosan is quaternized chitosan and carboxylated chitosan with a mass ratio of 1:3 to 3:1, and further adding aminotrimethylenephosphonic acid as a component of the scale and corrosion inhibitor treatment agent improves the corrosion inhibition effect of the scale and corrosion inhibitor treatment agent.

[0044] Experimental Example 3 Take the water sample from a steel plant. The main water quality indicators are chloride ion 50 mg / L, hardness 7 mmol / L, and alkalinity 4 mmol / L. The corrosion inhibition performance test method is carried out in accordance with GB / T 18175-2014 "Determination of Corrosion Inhibition Performance of Water Treatment Agents - Rotating Coupon Method". Among them, the dosage of the scale and corrosion inhibitor treatment agent is 10 ppm. The results are shown in Table 3.

[0045] Table 3 Corrosion Inhibition Rate Test Results

[0046] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. Scale and corrosion inhibitor for preventing filter material caking in steel mills, characterized in that, It 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 formaldehyde sulfonate, 3 - 5 parts of chitosan, and 35 - 55 parts of solvent.

2. The scale and corrosion inhibitor for preventing filter material caking in a steel plant according to claim 1, wherein The chitosan comprises quaternized chitosan and / or carboxylated chitosan.

3. The scale and corrosion inhibitor for preventing filter material caking in a steel plant according to claim 2, characterized in that When the chitosan is quaternized chitosan and carboxylated chitosan, the mass ratio of the quaternized chitosan to the carboxylated chitosan is 1:3 - 3:

1.

4. The scale and corrosion inhibitor for preventing filter material caking in a steel plant according to claim 1, characterized in that, The polycarboxylic acid compound comprises one or two of sodium polyacrylate and sodium polymethacrylate.

5. The scale and corrosion inhibitor for preventing filter material caking in a steel plant according to claim 1, characterized in that, It further comprises the following component in parts by weight: 1 - 4 parts of aminotrimethylene phosphonic acid.

6. The preparation method of the scale and corrosion inhibitor for preventing filter media caking in a steel plant according to any one of claims 1 to 4, characterized in that, It comprises the following steps: S1. First mix the polycarboxylic acid compound, polyepoxysuccinic acid and solvent to obtain a mixture. S2. Add sodium polynaphthalene formaldehyde sulfonate and chitosan to the mixture for a second mixing to obtain the scale and corrosion inhibitor.

7. The preparation method of the scale and corrosion inhibitor for preventing filter material caking in a steel plant according to claim 5, characterized in that, It comprises the following steps: S1. First mix the polycarboxylic acid compound, polyepoxysuccinic acid and solvent to obtain a mixture. S2. Add sodium polynaphthalene formaldehyde sulfonate, chitosan and aminotrimethylene phosphonic acid to the mixture for a second mixing to obtain the scale and corrosion inhibitor.

8. The preparation method of the scale and corrosion inhibitor for preventing filter material caking in a steel mill according to claim 6 or 7, characterized in that, The temperature of the first mixing is 40 - 50 °C, the rotation speed is 300 - 500 r / min, and the time is 45 - 65 min.

9. The preparation method of the scale and corrosion inhibitor for preventing filter material caking in a steel plant according to claim 6 or 7, characterized in that, The temperature of the second mixing is 35 - 45 °C, the rotation speed is 150 - 300 r / min, and the time is 30 - 50 min.

10. Application of the scale and corrosion inhibitor for preventing filter clogging in steel mills according to any one of claims 1 - 5 or the scale and corrosion inhibitor prepared by the preparation method according to any one of claims 6 - 7 in preventing filter clogging in steel mills.

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