CN114849297B - Inhibitor, method and application for treating hardening of filter material of blast furnace slag flushing bottom filter tank - Google Patents
Inhibitor, method and application for treating hardening of filter material of blast furnace slag flushing bottom filter tank Download PDFInfo
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- CN114849297B CN114849297B CN202210492302.XA CN202210492302A CN114849297B CN 114849297 B CN114849297 B CN 114849297B CN 202210492302 A CN202210492302 A CN 202210492302A CN 114849297 B CN114849297 B CN 114849297B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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, a method and application for treating hardening of filter materials of a blast furnace slag flushing bottom filter tank. The raw material components comprise: 0.2-2.0 parts of sodium lignin sulfonate; 0.2-2.0 parts of EDTA-2Na;1.0-10.0 parts of phytic acid; 1.0-10.0 parts of polyepoxysuccinic acid; 0.2-2.0 parts of citric acid; 1.0-5.0 parts of a polymeric alcohol 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 synergistic agent; 40.0-70.0 parts of water. During preparation, the raw materials are mixed and stirred until the inhibitor is clear and transparent. When in use, 50-500mg inhibitor is added per liter of water, and the dosing period is 1 week and 1 time. The inhibitor can inhibit the hardening of the filter material on the premise of not changing the quality of the flushing slag.
Description
Technical Field
The invention relates to the technical field of blast furnace ironmaking, in particular to an inhibitor, a method and application for treating hardening of filter materials of a blast furnace slag flushing bottom filter tank.
Background
Due to the higher and higher environmental protection requirements, more and more iron and steel plants use the whitening environment-friendly slag bottom flushing filter process in new or reconstructed blast furnaces. The bottom filter method is different from other methods in that the water slag precipitation mode is different, a plurality of rows of perforated drainage filter pipes are laid at the bottom of the bottom filter, filter materials (cobbles) with certain thickness and certain size fraction are laid above the filter pipes, slag flushing water enters the bottom filter, water in the water tank is pumped to a cooling tower or a waste heat recovery system through a hot water filter pump, and then the water is conveyed to a blast furnace slag flushing ditch through a cold water slag flushing pump, so that the water is recycled. The blast furnace water slag is filtered and retained in the bottom filter tank, and is grabbed by the crown block grab bucket for outward transportation. The advantage is that the filtered water is cleaner, the water is not dripped in the transportation process of the water slag, and the factory is clean. The bottom filtration method needs to regularly back flush the filter tank to ensure the filtering effect of the water slag. The phenomenon of hardening of filter materials can occur in the recycling use process of slag flushing water, and long-term operation can lead to the reduction of water flow of a bottom filter tank, thereby affecting the normal slag flushing of a blast furnace. If the production is stopped and the filter material is replaced, the problems of construction period, construction safety, solid waste storage, filter material collection and buying cost and the like are also existed.
Because the water quality of the slag flushing water has the characteristics of high temperature (higher than 80 ℃), high hardness (higher than 1400 mg/L) and complex water quality, the hardening trend is very strong. At present, the scale inhibition and dispersion performance of the water treatment inhibitor are not ideal, the water treatment inhibitor cannot play a role, and the on-site practical problem is difficult to solve.
Disclosure of Invention
Aiming at the defects, the invention provides a simple, effective and economic inhibitor, a method and application for treating the hardening of the filter material of the blast furnace slag flushing bottom filter, which solve the problems of the hardening of the filter material of 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, the construction safety, the storage of the solid waste, the cost of purchasing the filter material and the like in the process of replacing the filter material.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the invention aims at disclosing an inhibitor for treating hardening of a filter material of a blast furnace slag flushing bottom filter, which comprises the following raw materials in parts by weight: 0.2-2.0 parts of sodium lignin sulfonate; 0.2-2.0 parts of EDTA-2Na;1.0-10.0 parts of phytic acid; 1.0-10.0 parts of polyepoxysuccinic acid; 0.2-2.0 parts of citric acid; 1.0-5.0 parts of a polymeric alcohol 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 synergistic agent; 40.0-70.0 parts of water.
Further, the synergistic agent is one or a mixture of sodium hydroxide, polyacrylic acid and OP-15.
The invention also aims at disclosing a preparation method of the inhibitor for treating the hardening of the filter material of the blast furnace slag flushing bottom filter tank, which comprises the following steps: mixing the above raw materials, stirring at normal temperature and normal pressure for 30-120 min, clarifying and stopping stirring, and standing.
The invention also aims at disclosing a use method of the inhibitor for treating the hardening of the filter material of the blast furnace slag flushing bottom filter tank, which comprises the following steps: when in use, the inhibitor is put into the slag bottom filter of the blast furnace according to the proportion of 50-500mg of the inhibitor per 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 of the blast furnace slag flushing bottom filter tank, namely the inhibitor is suitable for filtering and purifying water with the calcium hardness of more than 1000 mg/L.
Further, the conditions of the water quality include the following aspects: PH 9.5; conductivity is 15300us/cm; the total alkalinity is 127mg/L; cl — The concentration is 9820mg/L; the total hardness is 2328mg/L; ca (Ca) 2+ Concentration 2310mg/L; turbidity 14NTU.
The beneficial effects of the invention are as follows:
the prior art considers that the hardening and blocking solution needs to be soaked and dissolved by an acid inhibitor, so that the slag flushing water has strong corrosiveness. The degradation of the filter material plate caking by the inhibitor of the invention mainly utilizes the emulsification effect, the caking blocks are soaked by the inhibitor, obvious emulsified floccules exist among gaps of the filter material (cobbles) for 30 minutes, and the floccules are finer and can be washed away along with water flow. Meanwhile, the inhibitor is added into the slag flushing water to inhibit hardening of the filter material on the premise of not changing the quality of the slag flushing water.
Thus, the present invention has the following outstanding advantages:
1. the flow of the bottom filter tank can maintain normal design flow for a long time, so as to meet the slag flushing process requirement;
2. when the slag flushing tank has hardening signs but does not influence normal slag flushing water flow, the inhibitor is added to slowly relieve the hardening signs;
3. the service cycle of the filter material of the bottom filter tank is prolonged, and the maintenance cycle of the bottom filter tank is prolonged;
4. saving the cost of replacing the filter material of the bottom filter;
5. the service time of the bottom filter tank is prolonged.
In addition, the method of the invention has simple operation, low treatment cost and no environmental pollution.
Drawings
FIG. 1 shows the start of the experiment for 0 hours with inhibitor added to each beaker in example 3;
FIG. 2 shows the change in filter material of each beaker after 1 hour of soaking with inhibitor in example 3;
FIG. 3 shows the change in filter material of each beaker after 2 hours of soaking with inhibitor in example 3;
FIG. 4 shows the change in filter material of each beaker after 24 hours of soaking with inhibitor in example 3;
FIG. 5 shows the change in filter material of each beaker after 48 hours of soaking with inhibitor in example 3;
FIG. 6 shows the beaker filters after 48 hours of soaking with inhibitor in example 3;
FIG. 7 shows the condition of each beaker filter material after the inhibitor is added and soaked for 96 hours in the embodiment 3, and the crystals between the caking of the middle beaker plate completely disappear at the moment, and the common filter material soaking experiment is finished;
FIG. 8 shows the environment-friendly filter material and the water residue after the inhibitor is added and soaked for 144 hours in the embodiment 3;
FIG. 9 shows the environment-friendly filter material in example 3 after adding the inhibitor and soaking for 168 hours, and after washing the filter material with water, the crystals between the caking of the environment-friendly filter material plate completely disappear, and the environment-friendly filter material soaking experiment is ended;
FIG. 10 shows the water granulated slag after being soaked in the inhibitor for 216 hours in the water granulated slag in the embodiment 3, and the crystals between the caking of the water granulated slag are completely disappeared, and the experiment is ended;
FIG. 11 shows the comparative effect of the inventive inhibitor of example 4 on the block before and after the experiment;
FIG. 12 is a graph showing the comparative effects of the hydrolyzed polymaleic anhydride-containing block used in example 4 before and after the experiment;
FIG. 13 shows the effect of the acrylic sulfonate copolymer of example 4 on the comparison of the block before and after the experiment.
Detailed Description
In order to better understand the technical solutions of the present invention, the following description will clearly and completely describe the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
The invention relates to an inhibitor for treating hardening of a filter material of a blast furnace slag flushing bottom filter, which comprises the following raw materials in parts by weight: 0.2-2.0 parts of sodium lignin sulfonate; 0.2-2.0 parts of EDTA-2Na;1.0-10.0 parts of phytic acid; 1.0-10.0 parts of polyepoxysuccinic acid; 0.2-2.0 parts of citric acid; 1.0-5.0 parts of a polymeric alcohol 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 synergistic agent; 40.0-70.0 parts of water.
The experimental methods in the following examples are conventional methods unless otherwise specified. The test materials used in the examples described below, unless otherwise specified, were purchased from conventional reagent stores. The quantitative tests in the following examples were all set up with three replicates, and the data are the mean or mean ± standard deviation of the three replicates.
Example 1:
the embodiment provides an inhibitor for treating hardening of filter materials of a blast furnace slag flushing bottom filter, which comprises the following raw materials in parts by weight: 1 part of sodium lignin sulfonate; 1 part of EDTA-2Na;5 parts of phytic acid; 5 parts of polyepoxysuccinic acid; 1 part of citric acid; 3 parts of a polymeric alcohol amine; 5 parts of sodium hydroxide; 15 parts of polymaleic anhydride; 20 parts of an acrylic acid and sulfonate copolymer; 3 parts of synergistic agents such as sodium hydroxide, polyacrylic acid, OP-15 and the like; 50 parts of water. Wherein, the manufacturers of polyepoxysuccinic acid, polymaleic anhydride and acrylic acid and sulfonate copolymer are Shandong Tai and water treatment technology Co., ltd, 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 flushing bottom filter tank comprises the following steps: mixing the above raw materials, stirring at normal temperature and normal pressure for 30-120 min, clarifying and stopping stirring, and standing.
When in use, the inhibitor is put into the slag bottom filter of the blast furnace according to the proportion of 50-500mg of the inhibitor per liter of slag flushing water, and the dosing period is 1 week and 1 time. The method is applicable to various water qualities with calcium hardness of 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:
1. and (3) analyzing the water quality of slag flushing water:
TABLE 1 results of Water quality analysis of slag flushing Water
| Project | Unit (B) | Slag flushing water |
| PH | 9.50 | |
| Conductivity of | us/cm | 15300 |
| Total alkalinity | mg/L | 126.97 |
| CL — | mg/L | 9819.74 |
| Total hardness of | mg/L | 2328.48 |
| Ca 2+ | mg/L | 2309.54 |
| Turbidity degree | NTU | 13.9 |
2. Soaking experiment:
2.1, test conditions:
A. experimental inhibitors: the inhibitor prepared in example 1;
B. test temperature, pressure: room temperature and pressure;
C. experimental instrument: 3 500mL beakers, a glass rod, a small hammer, tweezers and a measuring cylinder;
D. experimental time: step (3) of sectionally timing;
F. experimental materials: agglomeration of the environment-friendly filter material plate; agglomeration of a common filter material plate; the water slag plate is agglomerated.
2.2, experimental phenomena:
picture description: left beaker: agglomeration of the environment-friendly filter material plate;
intermediate beaker: agglomeration of a common filter material plate;
right beaker: the water slag plate is agglomerated.
2.3 experimental procedure: equal amounts of the above 3 inhibitors were poured into 3 beakers, respectively, to allow 3 plate cakes to be fully immersed in the inhibitors. Figures 1 to 10 record the course of the plate caking in each beaker over different time periods.
The experimental result shows that the inhibitor has obvious emulsifying effect on site hardening blocks, and can emulsify crystals among filter material plate hardening blocks (cobbles) so that the cobbles gradually recover the filtering function. The emulsified floccule is finer and finer, can be flushed away along with water flow, does not influence the water permeability of the bottom filter tank and does not influence the quality of iron slag.
Example 4
In order to verify the application effect of the inhibitor and other medicaments provided by the invention on the same kind of hardening blocks, the following comparative test is carried out:
1. the experimental process comprises the following steps: taking 3 500mL beakers, and respectively putting 53g of filter material plates of a blast furnace slag flushing bottom filter tank into the beakers for agglomeration;
2. test inhibitor: a bottom filter inhibitor, hydrolyzed polymaleic anhydride, and an acrylic acid sulfonate copolymer;
3. pouring the 3 inhibitors with equal amount into 3 beakers respectively to enable the hardening blocks to be completely soaked in the inhibitors;
4. observing the caking change of the plate, and photographing and recording;
5. after 24-36 hours of soaking, the plate blocks are decomposed to a certain extent, the rest plate blocks in the beaker are agglomerated and filtered, and solid and liquid are separated;
6. cleaning plate caking, airing and weighing;
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 little dissolution effect on plate caking; the acrylic acid sulfonate copolymer commonly used in the market at present can be singly used, but the inhibitor can seriously erode the filter material although the soluble plate is agglomerated, and the smoothness of the surface of the filter material is damaged after soaking, so that the filtering effect of the filter material on slag is affected.
The bottom filter inhibitor of the invention is added into water body, which not only can emulsify the hardened block, but also does not hurt the filter material, so that the filter material is recovered to be original shape, and the effect is best. On one hand, the hardening seed crystals are effectively dispersed and inhibited from growing, so that the filter material plates taking water slag (slag) as a main framework are difficult to agglomerate and grow in a short time, and gaps among filter materials (cobbles) are prevented from being blocked. Meanwhile, the inhibitor can continuously improve the water quality in actual operation, so that the whole slag flushing water system tends to be stable, safe, economical and operational. The main action principle is as follows:
1. emulsion chelation
The sodium lignin sulfonate, EDTA-2Na, citric acid, phytic acid, etc. have emulsifying effect, and can be used for forming plate-forming cation (such as Ca 2+ ，Mg 2+ Etc.) with inhibitors to form stable white emulsified chelates (coordination compounds) or soluble compounds, thereby preventing the hardening cations from forming anions (e.g. CO 3 2- ，SO 4 2- ，PO 4 3- And SiO 3 2- Etc.) to cause the filter material to be in the middle plate of the water bodyThe probability of junction is greatly reduced.
2. Dispersing action
The raw materials such as polyalcohol amine, polyepoxysuccinic acid, polymaleic acid, acrylic acid sulfonate copolymer and the like play a role in dispersing, and as a result, mutual contact and agglomeration among the plate-forming particles are prevented, so that further growth of the plate-forming condition can be prevented. The plate-forming particles can be calcium ions, magnesium ions or hundreds of CaCO 3 And MgC0 3 The plate-like micro-particles composed of equimolecular can also be dust, sediment or other water insoluble substances. (experiments show that 1mg of inhibitor can stabilize 10-100 mg of agglomerated particles in the slag water.) if sufficient inhibitor is present, the agglomerated particles (consisting of hundreds to thousands of CaCO's) are present 3 Molecular composition) is adsorbed and surrounded by the dispersing agent, and the plate-forming particles are prevented from being arranged on the regular lattice, so that the generated plate-forming material is soft and unstable and is easy to be taken away by flushing of slag flushing water flow.
3. The synergists such as sodium hydroxide, polyacrylic acid, OP-15 and the like mainly play roles in strengthening permeation and stabilizing the inhibitor, and improve the application effect of the inhibitor.
Thus, the present invention has the following outstanding advantages:
1. the flow of the bottom filter tank can maintain normal design flow for a long time, so as to meet the slag flushing process requirement;
2. when the slag flushing tank has hardening signs but does not influence normal slag flushing water flow, the inhibitor is added to slowly relieve the hardening signs;
3. the service cycle of the filter material of the bottom filter tank is prolonged, and the maintenance cycle of the bottom filter tank is prolonged;
4. saving the cost of replacing the filter material of the bottom filter;
5. the service time of the bottom filter tank 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 with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present invention.
Claims (6)
1. An inhibitor for treating hardening of filter materials of a blast furnace slag flushing bottom filter tank is characterized in that: the filter material is cobblestone; the raw material components comprise the following components in parts by weight: 0.2-2.0 parts of sodium lignin sulfonate; 0.2-2.0 parts of EDTA-2Na;1.0-10.0 parts of phytic acid; 1.0-10.0 parts of polyepoxysuccinic acid; 0.2-2.0 parts of citric acid; 1.0-5.0 parts of a polymeric alcohol 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 synergistic agent; 40.0-70.0 parts of water.
2. An inhibitor for treating hardening of filter material in a blast furnace slag bottom filter as set forth in claim 1, wherein: the synergistic agent is one or a mixture of sodium hydroxide, polyacrylic acid and OP-15.
3. The method for preparing the inhibitor for treating the hardening of the filter material of the blast furnace slag-washing bottom filter tank according to claim 1, which is characterized by comprising the following steps: mixing the raw materials, stirring at normal temperature and normal pressure for 30-120 min, clarifying and stopping stirring, and standing for use.
4. The method of using the inhibitor for treating hardening of filter materials of a blast furnace slag-down filter tank according to claim 1, wherein the inhibitor is added into the blast furnace slag-down filter tank according to the proportion of 50-500mg of inhibitor added into each liter of slag-down water, and the dosing period is 1 week and 1 time.
5. The use of an inhibitor for treating hardening of filter materials in a blast furnace slag bottom filter according to claim 1, wherein the inhibitor is suitable for water quality filtration purification with a calcium hardness of more than 1000 mg/L.
6. The process blast furnace according to claim 5The application of the inhibitor for hardening the filter material of the slag bottom filter tank is characterized in that the water quality conditions comprise the following aspects: the pH was 9.5; conductivity is 15300us/cm; the total alkalinity is 127mg/L; cl — The concentration is 9820mg/L; the total hardness is 2328mg/L; ca (Ca) 2+ Concentration 2310mg/L; turbidity 14NTU.
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| EP2737109B1 (en) * | 2011-07-29 | 2022-11-30 | Kemira OYJ | Scale-inhibiting polymers and methods for preventing scale formation |
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| CN105152365A (en) * | 2015-07-31 | 2015-12-16 | 潍坊友容实业有限公司 | Scale inhibitor for environment friendly seawater desalination membrane and usage method thereof |
| CN106745852A (en) * | 2016-12-15 | 2017-05-31 | 钦州市钦南区科学技术情报研究所 | A kind of phosphate-free corrosion inhibition antisludging agent and preparation method thereof |
| CN107051213A (en) * | 2017-06-08 | 2017-08-18 | 北京可林维尔化工有限公司 | Coked waste water reuse reverse osmosis membrane antisludging agent and preparation method thereof |
| CN113185008A (en) * | 2021-05-19 | 2021-07-30 | 上绍同烯达(绍兴)新材料科技有限公司 | Corrosion and scale inhibitor composition and application thereof |
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