CN114849297A - Inhibitor for treating hardening of filter material in blast furnace slag flushing bottom filter, method and application - Google Patents
Inhibitor for treating hardening of filter material in blast furnace slag flushing bottom filter, method and application Download PDFInfo
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- CN114849297A CN114849297A CN202210492302.XA CN202210492302A CN114849297A CN 114849297 A CN114849297 A CN 114849297A CN 202210492302 A CN202210492302 A CN 202210492302A CN 114849297 A CN114849297 A CN 114849297A
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/46—Regenerating the filtering material in the filter
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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Abstract
The invention relates to the technical field of blast furnace ironmaking equipment, in particular to an inhibitor for treating hardening of filter materials in a blast furnace slag washing bottom filter, a method and application. The raw material components comprise: 0.2-2.0 parts of sodium lignosulfonate; 0.2-2.0 parts of EDTA-2 Na; 1.0-10.0 parts of phytic acid; 1.0 to 10.0 parts of polyepoxysuccinic acid; 0.2-2.0 parts of citric acid; 1.0-5.0 parts of polyalcohol amine; 1.0-10.0 parts of sodium hydroxide; 5.0-30.0 parts of polymaleic anhydride; 5.0-30.0 parts of acrylic acid and sulfonate copolymer; 1.0-5.0 parts of a synergist; 40.0 to 70.0 parts of water. During preparation, the raw materials are mixed and stirred until the inhibitor is clear and transparent. When in use, 50-500mg of inhibitor is added into each liter of water, and the medicine is added for 1 time in 1 week. The inhibitor can inhibit the hardening of the filter material on the premise of not changing the quality of the slag washing water.
Description
Technical Field
The invention relates to the technical field of blast furnace ironmaking, in particular to an inhibitor for treating hardening of filter materials in a blast furnace slag washing bottom filter, a method and application.
Background
Due to the increasing environmental requirements, more and more steel plants use the white-eliminating environmental-friendly slag flushing bottom filter tank process when a blast furnace is newly built or reconstructed. The difference between the bottom filter method and other methods is that the mode of water slag precipitation is different, a plurality of rows of perforated drainage filter pipes are laid at the bottom of the bottom filter, filter materials (cobblestones) with certain thickness and certain size fraction are laid above the filter pipes, slag flushing water enters the bottom filter, water in a water tank is pumped to a cooling tower or a waste heat recovery system through a hot water filter pump, and then is conveyed to a blast furnace slag flushing ditch through a cold water slag flushing pump, and the processes are recycled. The blast furnace granulated slag is filtered and retained in the bottom filter tank and is transported outside by a crane grab bucket. The advantages are that the filtered water is cleaner, the transportation process of the water slag is not dripped, and the factory is clean. The bottom filtration method requires regular backwashing of the filter tank to ensure the water slag filtration effect. The phenomenon of hardening of filter materials can occur in the recycling use process of the slag flushing water, and the water flow of the bottom filter tank can be reduced due to long-term operation, so that the normal slag flushing of a blast furnace is influenced. When the filter material is replaced during production stoppage, the problems of construction period, construction safety, solid waste storage, filter material purchasing cost and the like exist.
The slag flushing water has the characteristics of high temperature (higher than 80 ℃), high hardness (higher than 1400mg/L) and complex water quality, and has strong hardening tendency. The scale inhibition and dispersion performance of the existing water treatment inhibitor is not ideal, the due effect can not be exerted, and the actual problem on site is difficult to solve.
Disclosure of Invention
Aiming at the defects, the invention provides the inhibitor, the method and the application for simply, effectively and economically treating the hardening of the filter material in the blast furnace slag flushing bottom filter, and solves the problems of hardening of the filter material in the blast furnace slag flushing bottom filter, prolonging the service cycle of the filter material, reducing the generation of solid waste, avoiding the construction cycle, safe construction, solid waste storage, filter material acquisition and purchase cost and the like in the filter material replacing process.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the invention aims to disclose an inhibitor for treating hardening of filter materials in a blast furnace slag washing bottom filter, which comprises the following raw material components in parts by weight: 0.2-2.0 parts of sodium lignosulfonate; 0.2-2.0 parts of EDTA-2 Na; 1.0-10.0 parts of phytic acid; 1.0 to 10.0 parts of polyepoxysuccinic acid; 0.2-2.0 parts of citric acid; 1.0-5.0 parts of polyalcohol amine; 1.0-10.0 parts of sodium hydroxide; 5.0-30.0 parts of polymaleic anhydride; 5.0-30.0 parts of acrylic acid and sulfonate copolymer; 1.0-5.0 parts of a synergist; 40.0 to 70.0 parts of water.
Further, the synergist is one or a mixture of sodium hydroxide, polyacrylic acid and OP-15.
The invention also discloses a preparation method of the inhibitor for treating hardening of the filter material in the blast furnace slag washing bottom filter, which comprises the following steps: mixing the above raw materials, stirring with a stirrer at normal temperature and normal pressure for 30-120 min, clarifying the inhibitor, stopping stirring, and standing.
The invention also discloses a use method of the inhibitor for treating hardening of the filter material in the blast furnace slag washing bottom filter, which comprises the following steps: when in use, the inhibitor is added into the blast furnace slag flushing bottom filter according to the proportion of adding 50-500mg of the inhibitor into each liter of slag flushing water, and the dosing period is 1 week and 1 time.
The invention also aims to disclose the application of the inhibitor for treating the hardening of the filter material in the blast furnace slag flushing bottom filter, namely the inhibitor is suitable for filtering and purifying water with calcium hardness of more than 1000 mg/L.
Further, the above water quality conditions include the following: the pH is 9.5; the conductivity is 15300 us/cm; the total alkalinity is 127 mg/L; cl — The concentration is 9820 mg/L; the total hardness is 2328 mg/L; ca 2+ The concentration is 2310 mg/L; turbidity 14 NTU.
The invention has the beneficial effects that:
the prior art considers that the caking dissolution of the hardened slab needs to be carried out by soaking and dissolving with an acid inhibitor, so that the slag flushing water has strong corrosivity. The inhibitor of the invention mainly utilizes emulsification to decompose filter material plate lumps, the hardened lumps are soaked in the inhibitor, and obvious emulsified floccules exist among filter material (cobblestone) gaps within 30 minutes, and the floccules are fine and smooth and can be washed away along with water flow. Meanwhile, the inhibitor is added into the slag washing water, so that the hardening of the filter material is inhibited on the premise of not changing the quality of the slag washing water.
Therefore, the invention has the following outstanding advantages:
1. the flow of the bottom filter tank can maintain the normal design flow for a long time, and the slag flushing process requirement is met;
2. when the slag flushing tank shows the hardening signs but does not influence the normal slag flushing water flow, the inhibitor is added to slowly relieve the hardening signs;
3. prolonging the service cycle of the filter material in the bottom filter tank and the overhaul cycle of the bottom filter tank;
4. the cost for replacing the filter material of the bottom filter tank is saved;
5. the service time of the bottom filter is prolonged.
In addition, the method of the invention has simple operation, low treatment cost and no environmental pollution.
Drawings
FIG. 1 shows the addition of the inhibitor to each beaker of example 3 for 0 hour, at the start of the experiment;
FIG. 2 is a graph showing the change of the filter material in each beaker after soaking for 1 hour with the addition of the inhibitor in example 3;
FIG. 3 is the change of the filter material of each beaker after soaking for 2 hours by adding the inhibitor in example 3;
FIG. 4 is a graph showing the change in filter material in each beaker after soaking for 24 hours with the addition of the inhibitor in example 3;
FIG. 5 is a graph showing the change in filter material in each beaker after 48 hours of soaking in the inhibitor of example 3;
FIG. 6 shows the condition of the filter material in each beaker after being soaked in the inhibitor for 48 hours and washed with water in example 3;
FIG. 7 shows the situation that after the inhibitor is added and soaked for 96 hours in example 3, the filter material in each beaker is washed by water, at this time, crystals between the lumps of the middle beaker plate completely disappear, and the soaking experiment of the common filter material is finished;
FIG. 8 is the situation after the inhibitor is added and soaked for 144 hours and the environment-friendly filter material and the water granulated slag are washed in example 3;
FIG. 9 shows the situation that after the environmental-friendly filter material is soaked in the inhibitor for 168 hours in example 3, the filter material is washed with water, and at this time, crystals between agglomerates of the environmental-friendly filter material completely disappear, and the soaking experiment of the environmental-friendly filter material is finished;
FIG. 10 shows the situation of example 3 in which the crystal between the lumps of the granulated slag plate completely disappears after the granulated slag is washed after the granulated slag is added with the inhibitor and soaked for 216 hours, and the experiment is ended;
FIG. 11 is a graph showing the comparative effect of the hardening block of example 4 using the inhibitor of the present invention before and after the experiment;
FIG. 12 is a graph showing the comparative effect of the hardened mass using hydrolyzed polymaleic anhydride before and after the experiment in example 4;
FIG. 13 is a comparison of the effect of hardening blocks using the acrylate sulfonate copolymer of example 4 before and after the experiment.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention relates to an inhibitor for treating hardening of filter materials in a blast furnace slag flushing bottom filter, which comprises the following raw material components in parts by weight: 0.2-2.0 parts of sodium lignosulfonate; 0.2-2.0 parts of EDTA-2 Na; 1.0-10.0 parts of phytic acid; 1.0 to 10.0 parts of polyepoxysuccinic acid; 0.2-2.0 parts of citric acid; 1.0-5.0 parts of polyalcohol amine; 1.0-10.0 parts of sodium hydroxide; 5.0-30.0 parts of polymaleic anhydride; 5.0-30.0 parts of acrylic acid and sulfonate copolymer; 1.0-5.0 parts of a synergist; 40.0 to 70.0 parts of water.
The experimental procedures in the following examples are conventional unless otherwise specified. The test materials used in the following examples were purchased from a conventional reagent store unless otherwise specified. In the quantitative tests in the following examples, three replicates were set, and the data are the mean or the mean ± standard deviation of the three replicates.
Example 1:
the embodiment provides an inhibitor for treating hardening of filter materials in a filter at the bottom of a blast furnace slag flushing bottom, which comprises the following raw material components in parts by weight: 1 part of sodium lignosulfonate; 1 part of EDTA-2 Na; 5 parts of phytic acid; 5 parts of polyepoxysuccinic acid; 1 part of citric acid; 3 parts of polyalcohol amine; 5 parts of sodium hydroxide; 15 parts of polymaleic anhydride; 20 parts of acrylic acid and sulfonate copolymer; 3 parts of a synergist such as sodium hydroxide, polyacrylic acid, OP-15, etc.; 50 parts of water. Wherein, the manufacturers of the polyepoxysuccinic acid, the polymaleic anhydride and the acrylic acid and sulfonate copolymer are Shandong Tai and water treatment science and technology Co, and the brand is Taihe brand.
Example 2
The preparation method of the inhibitor for treating the hardening of the filter material of the blast furnace slag washing bottom filter comprises the following steps: mixing the above raw materials, stirring with a stirrer at normal temperature and normal pressure for 30-120 min, clarifying the inhibitor, stopping stirring, and standing.
When in use, the inhibitor is added into the blast furnace slag flushing bottom filter according to the proportion of adding 50-500mg of the inhibitor into each liter of slag flushing water, and the dosing period is 1 week and 1 time. The method is suitable for various water qualities with calcium hardness more than 1000 mg/L.
Example 3
In order to verify the application effect of the inhibitor provided by the invention on different filter materials, the following tests are carried out:
firstly, analyzing the water quality of slag flushing water:
TABLE 1 analysis result of water quality of slag flushing water
| Item | Unit of | Slag flushing water |
| PH | 9.50 | |
| Electrical conductivity of | us/cm | 15300 |
| Total alkalinity | mg/L | 126.97 |
| CL — | mg/L | 9819.74 |
| Total hardness | mg/L | 2328.48 |
| Ca 2+ | mg/L | 2309.54 |
| Turbidity of water | NTU | 13.9 |
Secondly, soaking experiment:
2.1, test conditions:
A. experimental inhibitors: the inhibitor prepared in example 1;
B. test temperature and pressure: room temperature and room pressure;
C. an experimental instrument: 3 500mL beakers, glass rods, small iron hammers, tweezers and measuring cylinders;
D. experiment time: timing in a segmented manner;
F. experimental materials: caking of the environment-friendly filter plate; caking of a common filter plate; the water slag plate is agglomerated.
2.2, experimental phenomena:
description of the pictures: left beaker: caking of the environment-friendly filter plate;
intermediate beaker: caking of a common filter plate;
and (3) carrying out beaker on the right: the water slag plate is agglomerated.
2.3 Experimental procedures: equal amounts of the above 3 inhibitors were poured into 3 beakers, respectively, so that the 3 plate cakes were completely soaked in the inhibitors. Figures 1 to 10 record the course of the hardening blocks in each beaker over different periods of time.
The experimental results show that the inhibitor has obvious emulsification effect on-site hardened lumps, can emulsify crystals among agglomerated cobblestones on a filter plate, and enables the cobblestones to gradually recover the filtering function. The emulsified floccules are fine and smooth and can be washed away along with water flow, the water permeability of the bottom filter tank is not influenced, and the quality of the iron slag is not influenced.
Example 4
In order to verify the application effect of the inhibitor and other medicaments provided by the invention on the same hardening block, the following comparative tests are carried out:
1. the experimental process comprises the following steps: 3 500mL beakers are taken and respectively put into 53g filter material plates of a blast furnace slag flushing bottom filter for agglomeration;
2. test inhibitors: a bottom filter inhibitor, hydrolyzed polymaleic anhydride and an acrylic acid sulfonate copolymer;
3. pouring the same amount of the above 3 inhibitors into 3 beakers respectively to completely soak the hardening blocks in the inhibitors;
4. observing the change of the caking of the plate, and taking a picture for recording;
5. after 24-36 hours of soaking, the hardened blocks are decomposed to a certain degree, the residual blocks in the beaker are filtered, and solid and liquid are separated;
6. the cleaning plate is agglomerated, dried and weighed;
7. the remaining inhibitor was weighed.
Experimental data
From the above table and fig. 11 to 13, the experimental conclusion can be drawn:
the hydrolyzed polymaleic anhydride has almost no dissolving effect on the plate agglomeration; although the acrylic acid sulfonate copolymer commonly used in the market at present can dissolve the plate caking when being used alone, the inhibitor has serious erosion on the filter material and damages the smoothness of the surface of the filter material after soaking, thereby influencing the filtering effect of the filter material on slag.
The bottom filter inhibitor is added into the water body, so that the plate-opening caking can be emulsified, the filter material is not damaged, the filter material is recovered, and the effect is best. On one hand, the hardened 'seed crystals' are effectively dispersed and inhibited from growing up, so that filter material hardened blocks taking water slag (slag) as a main framework are difficult to aggregate and grow up in a short time, and gaps among filter materials (cobblestones) are prevented from being blocked. Meanwhile, the inhibitor can also continuously improve the water quality in actual operation, so that the whole slag flushing water system tends to be stable, safe, economic and operational. The main action principle is as follows:
1. emulsification chelation
The sodium lignosulfonate, EDTA-2Na, citric acid, phytic acid, etc. have emulsifying and chelating effects, so that plate-forming cations (such as Ca) are formed 2+ ，Mg 2+ Etc.) with inhibitors to form stable white emulsified chelates (complexes) or soluble compounds that prevent plate-forming cations and plate-forming anions (e.g., CO) 3 2- ，SO 4 2- ，PO 4 3- And SiO 3 2- Etc.) to greatly reduce the hardening probability of the filter material in the water body.
2. Dispersing action
The raw materials such as polyalcohol amine, polyepoxysuccinic acid, polymaleic acid, acrylic sulfonate copolymer and the like play a role of dispersing, so that mutual contact and agglomeration among plate-forming particles are prevented, and further growth of hardened conditions can be prevented. The hardened particles may be calcium and magnesium ions, or thousands of CaCO 3 And MgC0 3 The plate-forming small microparticles composed of molecules can also be dust, silt or other water-insoluble substances. (experiments show that 1mg of inhibitor can enable 10-100 mg of plate-forming particles to stably exist in the slag flushing water.) if a sufficient amount of inhibitor exists, the plate-forming particles (hundreds of CaCO) exist 3 Molecular composition) is adsorbed and surrounded by the dispersant, and the plate-forming particles are prevented from being arranged on a regular lattice array, so that the generated plate-forming objects are soft and infirm and are easily taken away by flushing of slag flushing water flow.
3. The sodium hydroxide, polyacrylic acid, OP-15 and other synergists mainly play roles in strengthening penetration and stabilizing the inhibitor, and improve the application effect of the inhibitor.
Therefore, the invention has the following outstanding advantages:
1. the flow of the bottom filter tank can maintain the normal design flow for a long time, and the slag flushing process requirement is met;
2. when the slag flushing tank shows the hardening signs but does not influence the normal slag flushing water flow, the inhibitor is added to slowly relieve the hardening signs;
3. prolonging the service cycle of the filter material in the bottom filter tank and the overhaul cycle of the bottom filter tank;
4. the cost for replacing the filter material of the bottom filter tank is saved;
5. the service time of the bottom filter is prolonged.
In addition, the method of the invention has simple operation, low treatment cost and no environmental pollution.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (6)
1. An inhibitor for treating hardening of filter materials in a filter pool at the bottom of slag flushing of a blast furnace is characterized in that: the raw material components comprise the following components in parts by weight: 0.2-2.0 parts of sodium lignosulfonate; 0.2-2.0 parts of EDTA-2 Na; 1.0-10.0 parts of phytic acid; 1.0 to 10.0 parts of polyepoxysuccinic acid; 0.2-2.0 parts of citric acid; 1.0-5.0 parts of polyalcohol amine; 1.0-10.0 parts of sodium hydroxide; 5.0-30.0 parts of polymaleic anhydride; 5.0-30.0 parts of acrylic acid and sulfonate copolymer; 1.0-5.0 parts of a synergist; 40.0 to 70.0 parts of water.
2. The inhibitor for treating hardening of filter material in a blast furnace slag washing bottom filter according to claim 1, which is characterized in that: the synergist is one or more of sodium hydroxide, polyacrylic acid and OP-15.
3. The preparation method of the inhibitor for treating the hardening of the filter material in the blast furnace slag washing bottom filter according to claim 1, which is characterized by comprising the following steps: mixing the raw material components, stirring for 30-120 minutes by a stirrer at normal temperature and normal pressure, stopping stirring after the inhibitor is clear and transparent, and standing for later use.
4. The use method of the inhibitor for treating the hardening of the filter material in the blast furnace slag flushing bottom filter according to claim 1, wherein the inhibitor is added into the blast furnace slag flushing bottom filter according to the proportion of 50-500mg of the inhibitor added into each liter of slag flushing water, and the dosing period is 1 week and 1 time.
5. The application of the inhibitor for treating the hardening of the filter material in the blast furnace slag flushing bottom filter as claimed in claim 1, wherein the inhibitor is suitable for filtering and purifying water with calcium hardness of more than 1000 mg/L.
6. The application of the inhibitor for treating the hardening of the filter material in the blast furnace slag washing bottom filter according to claim 5, wherein the water quality condition comprises the following aspects: the pH is 9.5; the conductivity is 15300 us/cm; the total alkalinity is 127 mg/L; cl — The concentration is 9820 mg/L; the total hardness is 2328 mg/L; ca 2+ The concentration is 2310 mg/L; turbidity 14 NTU.
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