CN107324512B - Scale cleaning agent and cleaning method for slag flushing water system of iron works - Google Patents
Scale cleaning agent and cleaning method for slag flushing water system of iron works Download PDFInfo
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- CN107324512B CN107324512B CN201710540179.3A CN201710540179A CN107324512B CN 107324512 B CN107324512 B CN 107324512B CN 201710540179 A CN201710540179 A CN 201710540179A CN 107324512 B CN107324512 B CN 107324512B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/14—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing phosphorus
- C02F5/145—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing phosphorus combined with inorganic substances
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
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Abstract
The invention relates to a scale cleaning agent for a slag flushing water system of an iron works, which comprises the following components in percentage by mass: 5 to 45 percent of S-carboxyethyl thiosuccinic acid, 1 to 45 percent of polyether polyamino methylene phosphonate N-oxide, 6 to 40 percent of acrylic acid-hydroxypropyl acrylate copolymer, 20 to 35 percent of hydrochloric acid, 1 to 25 percent of diethylenetriamine pentamethylene phosphoric acid and 0.1 to 3 percent of maleic acid diisooctyl sulfonate; the mass concentration of the hydrochloric acid is 30-36%. The invention also relates to a cleaning method of the slag flushing water system of the iron works. The scale cleaning agent can effectively remove scales on equipment and pipelines in a slag flushing water system of an iron works, and has the advantages of strong pertinence, green and environment-friendly formula, low cost and simple preparation.
Description
Technical Field
The invention relates to the technical field of cleaning of chemical systems, in particular to a scale cleaning agent and a cleaning method for a slag flushing water system of an iron works.
Background
Blast furnace slag is a solid waste formed from gangue in the ore, ash in the fuel and non-volatile components in the flux during the blast furnace iron making process, and mainly contains oxides and small amounts of sulfides of calcium, silicon, aluminum, magnesium, iron.
The water quenching process of blast furnace slag is the main method for treating blast furnace slag in iron works in China at present, and circulating water is used for water quenching blast furnace slag through a slag flushing water system. Please refer to fig. 1, which is a schematic diagram of a slag flushing water system in a conventional iron works, wherein arrows indicate the flow direction of circulating water. The slag flushing water system generally comprises a blast furnace slag flushing port, a slag flushing ditch, a sedimentation system, a filtering system, a water tank, a circulating water suction well and a pump room, wherein the blast furnace slag flushing port, the slag flushing ditch, the sedimentation system, the filtering system, the water tank, the circulating water suction well and the pump room are connected through a pipeline or a ditch to form a circulating loop. The pump room is provided with a circulating water pump, the pump room is connected with the slag flushing port of the blast furnace through a pipeline, the pump room is also connected with a circulating water suction well through a pipeline, and a sedimentation tank is arranged in the sedimentation system.
The operation process of the slag flushing water system of the iron works is as follows: high-pressure circulating water from a circulating water pump of a pump room enters a blast furnace slag flushing port, high-temperature liquid slag is rapidly cooled, the slag is crushed and water-quenched and cooled into granulated slag, a slag-water mixture flows out of the blast furnace slag flushing port and enters a precipitation system and a filtering system through a slag flushing channel to complete slag-water separation, the dehydrated granulated slag is stored in a precipitation tank of the precipitation system, is cleaned out by slag cleaning equipment such as a crown block and is transported outwards, the separated slag flushing water enters a circulating water suction well through a water tank and is pressurized and conveyed to the blast furnace slag flushing port by a circulating water pump in the pump room for recycling.
At present, the slag flushing water system of an iron works has the problems of easy scaling and serious harm to equipment and pipelines due to scaling, and the scaling is caused by the following reasons: (1) the system introduces other external wastewater, such as sintering plant desulfurization wastewater, converter steelmaking dedusting wastewater and the like, which contains a large amount of salts, so that system equipment and pipelines are easy to scale; (2) various salts are dissolved in the recycled slag flushing water, the concentration of the salts is increased along with the evaporation of water during gradual cooling, crystals are separated out when the concentration of the salts reaches a saturated state, and the crystals are deposited on the water passing surface in the pipeline to form compact scale; (3) a large amount of dissolved oxygen in the slag flushing water can cause electrochemical corrosion, chloride ions and sulfate ions in the slag flushing water can cause pitting corrosion on the metal surface of the pipeline, corrosion products are deposited on the water passing surface of the pipeline, and scales such as ferric oxide are formed.
After the equipment such as pipelines, water pumps and the like in the slag flushing water system of the iron works are scaled, if the equipment and the pipelines are not cleaned in time, the operation efficiency of the equipment and the pipelines is reduced due to the scaling, the energy consumption and the material consumption are increased, and the blast furnace is forced to stop production under severe conditions, so that severe economic loss is caused. Therefore, in order to ensure that the slag flushing water system of the iron works can operate safely, stably and efficiently, the system needs to be cleaned and descaled.
However, because the scale formation components in the slag flushing water system of the iron works are complex, including various deposits such as calcium-magnesium carbonate scale, silicate scale, phosphate scale, iron oxide scale, aluminum scale, sulfur scale and the like, and the scale formation types include inorganic scale, colloid scale and the like, an effective cleaning agent and a cleaning method specially aiming at the scale formation of the slag flushing water system do not exist in the prior art, the stability of the water quality of circulating water in the system is difficult to maintain, and the operation of the slag flushing water system is still seriously influenced by the scale formation of equipment and pipelines.
Disclosure of Invention
Based on the above, the invention aims to provide the scale cleaning agent for the slag flushing water system of the iron works, which can effectively clean the scale of equipment and pipelines in the slag flushing water system of the iron works and has the advantages of strong pertinence, green and environment-friendly formula, low cost and simple preparation.
The technical scheme adopted by the invention is as follows:
a scale cleaning agent for a slag flushing water system of an iron works comprises the following components in percentage by mass:
5 to 45 percent of S-carboxyethyl thiosuccinic acid
1 to 45 percent of polyether polyamino methylene phosphonate N-oxide
Acrylic acid-hydroxypropyl acrylate copolymer 6-40%
20 to 35 percent of hydrochloric acid
1 to 25 percent of diethylenetriamine pentamethylene phosphonic acid
0.1 to 3 percent of maleic acid diisooctyl ester sulfonate;
the mass concentration of the hydrochloric acid is 30-36%.
The S-carboxyethyl thiosuccinic acid (CETSA) is a carboxylic acid polymer, contains macromolecular chains, has dispersing and scale inhibition effects, has good dispersing and dissolving capacities on various inorganic scales and colloidal scales, can be dispersed into insoluble salt particles at an insoluble salt crystallization center, reduces or controls the aggregation and scaling of insoluble salts, can also cause deposited crystals to generate lattice distortion to achieve the purpose of scale inhibition, and has strong dissolving capacities on scale deposits such as calcium carbonate, silicate, sulfate, phosphate and the like. CETSA also has rust-proofing properties and prevents the pipeline from rusting. CETSA has good water solubility, has good corrosion and scale inhibition performance in a wide pH range, has good biodegradability compared with common industrial and household detergents, is extremely easy to biodegrade, is phosphorus-free and environment-friendly, and does not cause environmental pollution.
The polyether polyamino methylene phosphonate N-oxide is a macromolecular phosphonate scale inhibitor, has dispersing capacity, has good effect when being used for a circulating water system, is stable in sewage, is difficult to be oxidized and degraded by heavy metal ions in the sewage, and can continuously play a dispersing role.
The acrylic acid-hydroxypropyl acrylate copolymer (T-225) has the functions of scale inhibition and dispersion, has good inhibition effect on the formation and deposition of calcium carbonate, calcium sulfate, zinc salt and calcium phosphate scale, also has good dispersion performance on ferric oxide, sludge, clay and oil scale, and has good miscibility of T-225 and organic phosphate.
The hydrochloric acid can dissolve the deposition of carbonate, silicate, phosphate, iron oxide scale, aluminum scale and the like, and can maintain the acidity of the cleaning agent and prevent the hydrolysis of metal ions such as iron ions, aluminum ions and the like.
Diethylenetriamine pentamethylene phosphonic acid (DTPMPA) is non-toxic, is easy to dissolve in an acidic solution, is generally used as a scale and corrosion inhibitor for circulating cooling water and boiler water in water treatment, has good scale and corrosion inhibition effects and good temperature resistance, and can inhibit the generation of carbonate and sulfate scales.
The diisooctyl maleate sulfonate, also called succinate sulfonate and quick penetrant T, is a high-efficiency penetrant and has the advantages of good wetting property and quick and uniform penetration.
The components in the scale cleaning agent disclosed by the invention play a synergistic effect, the diisooctyl maleate sulfonate can promote the cleaning agent to quickly permeate into the interior of scales and the joint of scales and the pipe wall, and after CETSA, polyether polyamino methylene phosphonate N-oxide, T-225 and DTPMPA are compounded, the diisooctyl maleate sulfonate has an integration and dispersion effect on scale-causing metal ions, so that the crystal structure of scales is changed, the scales are changed from compact to loose, and meanwhile, hydrochloric acid can dissolve the scales, so that the scale cleaning agent can enable various scales in a slag flushing water system to fall off or melt from the pipe wall, and the cleaning of the interior of pipelines and equipment of the slag flushing water system is realized.
Compared with the existing water treatment agent or scale inhibitor, the scale cleaning agent can be used for pertinently and efficiently removing scales of equipment and pipelines in a slag flushing water system of an iron works, the scale removal rate can reach more than 99.9 percent, the problem that the scales damage the operation of the slag flushing water system is solved, the formula design is reasonable, the scale cleaning agent can be prepared in advance and stored for later use, the treatment efficiency is high, the scale cleaning agent is green and environment-friendly, the cost is low, and the preparation is simple.
Further, the paint comprises the following components in percentage by mass:
s-carboxyethylthiosuccinic acid 22%
Polyether polyaminomethylene phosphonate N-sodium oxide 23%
Acrylic acid-hydroxypropyl acrylate copolymer 15%
Hydrochloric acid 20%
18 percent of diethylenetriamine pentamethylene phosphonic acid
2% of maleic acid diisooctyl ester sodium sulfonate;
the hydrochloric acid is industrial grade hydrochloric acid with the mass concentration of 31%, is easy to purchase and has low cost.
Further, the scale cleaning agent for the slag flushing water system of the iron works comprises the following components in percentage by mass:
s-carboxyethyl thiosuccinic acid 20%
Polyether polyaminomethylene phosphonate N-sodium oxide 25%
Acrylic acid-hydroxypropyl acrylate copolymer 12%
Hydrochloric acid 25%
15 percent of diethylenetriamine pentamethylene phosphonic acid
3% of diisooctyl maleate sodium sulfonate;
the hydrochloric acid is industrial grade hydrochloric acid with the mass concentration of 31%, is easy to purchase and has low cost.
Further, the scale cleaning agent for the slag flushing water system of the ironworks is prepared by the following steps: weighing the components according to the proportion at normal temperature and normal pressure, adding S-carboxyethyl thiosuccinic acid and polyether polyamino methylene phosphonate N-oxide into an enamel reaction kettle, starting a stirring motor, sequentially and slowly adding acrylic acid-hydroxypropyl acrylate copolymer, hydrochloric acid, diethylenetriamine pentamethylene phosphonic acid and maleic acid diisooctyl sulfonate, and stirring and mixing for 1-3 hours to obtain a finished product. The preparation method is simple to operate and easy to realize.
The invention also aims to provide a cleaning method of the slag flushing water system of the iron works, which comprises the following steps:
(1) stopping the operation of a slag flushing water system of an iron mill, then emptying circulating water in a pipeline to be cleaned in the slag flushing water system, then connecting a cleaning agent suction well, a cleaning pump and the pipeline to be cleaned by using a temporary pipeline to form a circulating loop, and filling a scale cleaning agent into the cleaning agent suction well, wherein the scale cleaning agent is any one of the scale cleaning agents;
(2) starting a cleaning pump to enable the scale cleaning agent to perform cleaning operation in the circulation loop formed in the step (1);
(3) and after the cleaning is finished, draining the sewage in the circulation loop, closing the temporary pipeline, stopping the cleaning pump, and then recovering the operation of the slag flushing water system of the iron works.
Because the whole slag flushing water system of the iron works consumes a large amount of scale cleaning agents, waste is easy to cause, the cost is high, and the cleaning method is unreasonable in economy, only part of pipelines in the system are selected as pipelines to be cleaned, and key pipelines and equipment are cleaned in a targeted manner, so that the purpose of cleaning scales can be achieved, the slag flushing water system after cleaning can be ensured to run safely, stably and efficiently, the cleaning cost can be reduced, and the cleaning efficiency and the operation flexibility can be improved. In addition, the cleaning method can clean a huge slag flushing water system only by using the cleaning agent suction well, the cleaning pump and the temporary pipeline, has the advantages of simple cleaning operation, easy realization, low labor cost and less used equipment, and can assemble a circulation loop during cleaning by utilizing equipment or facilities in a factory according to local conditions.
Further, in the step (1), the ratio of the quality of the used scale cleaning agent to the scale quality in the pipeline to be cleaned is 2-5: 1, the dosage of the scale cleaning agent is designed according to the scale quality, scale can be cleaned completely, and waste caused by excessive dosage of the scale cleaning agent is avoided.
Furthermore, in the step (1), the selected pipelines to be cleaned are pipelines between a pump room and a blast furnace slag flushing port in a slag flushing water system of an iron works and pipelines between the pump room and a circulating water suction well, the used cleaning agent suction well is a circulating water suction well in the slag flushing water system of the iron works, the used cleaning pump is a circulating water pump of the pump room in the slag flushing water system of the iron works, the number of the used temporary pipelines is one, one end of the temporary pipeline is connected with the end part, close to the slag flushing port of the blast furnace, of the pipeline to be cleaned, and the other end of the temporary pipeline is connected with the circulating water suction well.
The circulating water in the pipeline between the pump room and the slag flushing port of the blast furnace has the lowest temperature, and crystals are most easily precipitated to generate scale, so that the pipeline is selected as the pipeline to be cleaned, the inside of the circulating water pump of the key equipment is cleaned, and the smooth operation of the slag flushing water system after cleaning can be ensured to the greatest extent. Secondly, the circulating water suction well in the slag flushing water system and the circulating water pump of the pump room are directly used, so that equipment required for cleaning can be reduced, the number and the length of temporary pipelines can be reduced, the cost is further reduced, and the cleaning efficiency is improved. Moreover, after cleaning, sewage can be discharged into a sedimentation system and a filtering system of the slag flushing water system, scales in the sewage are left in a sedimentation tank of the sedimentation system and are cleaned out by slag cleaning equipment such as a crown block and the like for outward transportation treatment, and the content of effective components in the liquid obtained by filtering is very low, so that the liquid can be directly mixed with circulating water and then run in the slag flushing water system, and the sewage is free of outward discharge treatment and is more convenient and environment-friendly.
Further, in the step (2), the cleaning pump conveys the scaling cleaning agent at the maximum flow rate, so that the scaling cleaning agent flows in the circulation loop at a high flow rate to impact the scaling, which is beneficial to scaling refinement and falling off from the pipe wall, and further improves the cleaning efficiency.
Furthermore, in the step (2), the cleaning operation time of the scale cleaning agent in the circulating loop is 24-48 h.
Further, in the step (3), the time for discharging the sewage in the circulation loop is 2-4 hours.
For a better understanding and practice, the invention is described in detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic view of a slag flushing water system of a conventional iron works.
FIG. 2 is a schematic diagram illustrating the cleaning of the slag flushing water system of the ironworks according to the present invention.
Detailed Description
Example 1
The scale cleaning agent for the slag flushing water system of the iron works comprises the following components in percentage by mass:
s-carboxyethylthiosuccinic acid 22%
Polyether polyaminomethylene phosphonate N-sodium oxide 23%
Acrylic acid-hydroxypropyl acrylate copolymer 15%
Industrial grade hydrochloric acid (mass concentration 31%) 20%
18 percent of diethylenetriamine pentamethylene phosphonic acid
2 percent of maleic acid diisooctyl ester sodium sulfonate.
The scale cleaning agent is prepared by the following steps: weighing the components according to the proportion at normal temperature and normal pressure, adding S-carboxyethyl thiosuccinic acid and polyether polyamino methylene phosphonate N-sodium oxide into an enamel reaction kettle, starting a stirring motor, sequentially and slowly adding acrylic acid-hydroxypropyl acrylate copolymer, industrial-grade hydrochloric acid, diethylenetriamine pentamethylene phosphonic acid and maleic acid diisooctyl sulfonate sodium sulfonate, and stirring and mixing for 2 hours to obtain a finished product. And sampling and detecting finished products, packaging the finished products after the finished products are detected to be qualified, conveying the finished products to a finished product warehouse for storage after the packaging is finished, and simultaneously recording the production.
Refer to FIG. 2, which is a schematic diagram of the slag flushing water system of the ironworks according to the present invention, wherein the dotted line represents the temporary pipeline, and the arrow on the dotted line represents the flow direction of the scale-forming cleaning agent. The cleaning method of the slag flushing water system of the iron works in the embodiment is specifically carried out according to the following steps:
(1) and stopping the operation of the slag flushing water system of the iron works, selecting a pipeline between a pump room and a blast furnace slag flushing port and a pipeline between the pump room and a circulating water suction well in the slag flushing water system of the iron works as pipelines to be cleaned, evacuating circulating water in the pipelines to be cleaned, closing a valve between the pipeline to be cleaned and the blast furnace slag flushing port, and closing a valve between the circulating water suction well and a water pool. And then, using a temporary pipeline, connecting one end of the temporary pipeline with the end part of the pipeline to be cleaned, which is close to the slag flushing port of the blast furnace, and connecting the other end of the temporary pipeline with a circulating water suction well, so that the circulating water suction well and a circulating water pump of a pump room are connected with the pipeline to be cleaned to form a circulating loop, and filling the scaling cleaning agent into the circulating water suction well. The method comprises the steps of detecting the thickness of scale in a pipeline to be cleaned, calculating the quality of the scale, and determining the dosage of the scale cleaning agent to be poured into a circulating water suction well according to the condition that the ratio of the quality of the scale cleaning agent to the quality of the scale in the pipeline to be cleaned is 2-5: 1.
(2) And (3) starting a circulating water pump in the pump room, enabling the circulating water pump to convey the scale cleaning agent at the maximum flow rate, and enabling the scale cleaning agent to be cleaned in the circulating loop formed in the step (1) for 24-48 h.
(3) When the pipe wall of the pipeline to be cleaned is not scaled or the scaling thickness is not changed any more, after cleaning, a valve between the blast furnace slag flushing port and the water flushing slag channel is opened, the circulating water pump is continuously operated, sewage in the circulating loop is discharged into the precipitation system and the filtering system through the blast furnace slag flushing port and the water flushing slag channel, then the temporary pipeline is closed firstly, the circulating water pump is stopped, and pollution discharge operation is completed, wherein the time required by the whole pollution discharge operation is 2-4 hours. And finally, the operation of the slag flushing water system is recovered.
Example 2
The scale cleaning agent for the slag flushing water system of the iron works comprises the following components in percentage by mass:
s-carboxyethyl thiosuccinic acid 20%
Polyether polyaminomethylene phosphonate N-sodium oxide 25%
Acrylic acid-hydroxypropyl acrylate copolymer 12%
25 percent of industrial grade hydrochloric acid (mass concentration is 31 percent)
15 percent of diethylenetriamine pentamethylene phosphonic acid
3 percent of maleic acid diisooctyl ester sodium sulfonate.
The scale cleaning agent was prepared in the same manner as in example 1.
The method for cleaning the slag flushing water system of the ironworks of this example is the same as that of example 1.
Example 3
The scale cleaning agent for the slag flushing water system of the iron works comprises the following components in percentage by mass:
s-carboxyethyl thiosuccinic acid 12%
Polyether polyaminomethylene phosphonate N-sodium oxide 45%
Acrylic acid-hydroxypropyl acrylate copolymer 6%
28 percent of industrial grade hydrochloric acid (mass concentration is 31 percent)
8.9 percent of diethylenetriamine pentamethylene phosphonic acid
0.1 percent of maleic acid diisooctyl ester sodium sulfonate.
The scale cleaning agent was prepared in the same manner as in example 1.
The method for cleaning the slag flushing water system of the ironworks of this example is the same as that of example 1.
Example 4
The scale cleaning agent for the slag flushing water system of the iron works comprises the following components in percentage by mass:
s-carboxyethylthiosuccinic acid 5%
Polyether polyaminomethylene phosphonate N-sodium oxide 1%
Acrylic acid-hydroxypropyl acrylate copolymer 40%
26 percent of industrial grade hydrochloric acid (mass concentration is 31 percent)
25 percent of diethylenetriamine pentamethylene phosphonic acid
3 percent of maleic acid diisooctyl ester sodium sulfonate.
The scale cleaning agent was prepared in the same manner as in example 1.
The method for cleaning the slag flushing water system of the ironworks of this example is the same as that of example 1.
Example 5
The scale cleaning agent for the slag flushing water system of the iron works comprises the following components in percentage by mass:
45 percent of S-carboxyethyl thiosuccinic acid
Polyether polyaminomethylene phosphonate N-sodium oxide 12%
Acrylic acid-hydroxypropyl acrylate copolymer 6%
35 percent of industrial grade hydrochloric acid (mass concentration is 31 percent)
1 percent of diethylenetriamine pentamethylene phosphonic acid
1% of maleic acid diisooctyl ester sodium sulfonate.
The scale cleaning agent was prepared in the same manner as in example 1.
The method for cleaning the slag flushing water system of the ironworks of this example is the same as that of example 1.
Comparative example 1
The slag flushing water system for the iron works is cleaned by the water treatment agent, and the water treatment agent is prepared from the following components in percentage by mass: 4% of glycolic acid, 13% of hydroxyethylidene diphosphonic acid (HEDP), 8% of 2-phosphonic acid butane-1, 2, 4-tricarboxylic acid (PBTCA), 6% of ethylene diamine tetra methylene phosphonic acid sodium (EDTMP-Na), 6% of polyacrylic acid (PAA-H), 7% of hydrolyzed polymaleic anhydride (HPMA), 10% of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer (AA/AMPS), 6% of trisodium phosphate, 1% of Benzotriazole (BTA), 15% of isothiazolinone, 4% of 2-hydroxyphosphonoacetic acid (HPPA) and 20% of softened water.
The water treatment agent is prepared by a conventional mixing method.
The water treatment agent was used to clean a slag flushing water system of an iron works according to the cleaning method of example 1.
Comparative example 2
The slag flushing water system for the iron works is cleaned by the water treatment agent, and the water treatment agent is prepared from the following components in percentage by mass: 3% of sulfamic acid, 8% of 2-phosphonic butane-1, 2, 4-tricarboxylic acid (PBTCA), 6% of polyaminopolyether methylene Phosphonic Acid (PAPEMP), 6% of hydrolyzed polymaleic anhydride (HPMA), 8% of maleic acid-acrylic acid copolymer (MA-AA), 8% of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer (AA/AMPS), 6% of sodium hexametaphosphate, 1% of methylbenzotriazole (TTA), 1% of ammonium molybdate, 15% of isothiazolinone, 5% of glutaraldehyde, 13% of aminotrimethylene phosphonic Acid (ATMP) and 20% of softened water.
The water treatment agent is prepared by a conventional mixing method.
The water treatment agent was used to clean a slag flushing water system of an iron works according to the cleaning method of example 1.
The results of cleaning the scales on the piping of the slag flushing water system of the iron works in example 1, example 2, comparative example 1 and comparative example 2 are shown in the following table 1.
TABLE 1
As can be seen from Table 1, the scale cleaning agent of the embodiment 1 and the embodiment 2 can effectively remove the scale in the slag flushing water system of the iron works, and the scale removal rate reaches 100 percent; the conventional water treatment agents of comparative examples 1 and 2 have scale inhibition effect on circulating water systems, but cannot remove scale of formed slag flushing water systems with thicker thickness and cannot be used as scale cleaning agents.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (10)
1. The scale cleaning agent for the slag flushing water system of the iron works is characterized by comprising the following components in percentage by mass:
20-22% of S-carboxyethyl thiosuccinic acid
23-25% of polyether polyamino methylene phosphonate N-oxide
Acrylic acid-hydroxypropyl acrylate copolymer 12% -15%
20-25% of hydrochloric acid
15-18% of diethylenetriamine pentamethylene phosphonic acid
2% -3% of diisooctyl maleate sulfonate;
the hydrochloric acid is industrial grade hydrochloric acid with the mass concentration of 31%.
2. The scale cleaning agent for a slag flushing water system of an iron mill as claimed in claim 1, which comprises the following components in percentage by mass:
s-carboxyethylthiosuccinic acid 22%
Polyether polyaminomethylene phosphonate N-sodium oxide 23%
Acrylic acid-hydroxypropyl acrylate copolymer 15%
Hydrochloric acid 20%
18 percent of diethylenetriamine pentamethylene phosphonic acid
2% of maleic acid diisooctyl ester sodium sulfonate;
the hydrochloric acid is industrial grade hydrochloric acid with the mass concentration of 31%.
3. The scale cleaning agent for a slag flushing water system of an iron mill as claimed in claim 1, which comprises the following components in percentage by mass:
s-carboxyethyl thiosuccinic acid 20%
Polyether polyaminomethylene phosphonate N-sodium oxide 25%
Acrylic acid-hydroxypropyl acrylate copolymer 12%
Hydrochloric acid 25%
15 percent of diethylenetriamine pentamethylene phosphonic acid
3% of diisooctyl maleate sodium sulfonate;
the hydrochloric acid is industrial grade hydrochloric acid with the mass concentration of 31%.
4. The scale-forming cleaning agent for a slag flushing water system of an iron works according to any one of claims 1 to 3, which is prepared by the following steps: weighing the components according to the proportion at normal temperature and normal pressure, adding S-carboxyethyl thiosuccinic acid and polyether polyamino methylene phosphonate N-oxide into an enamel reaction kettle, starting a stirring motor, sequentially and slowly adding acrylic acid-hydroxypropyl acrylate copolymer, hydrochloric acid, diethylenetriamine pentamethylene phosphonic acid and maleic acid diisooctyl sulfonate, and stirring and mixing for 1-3 hours to obtain a finished product.
5. A cleaning method of a slag flushing water system of an iron works is characterized by comprising the following steps:
(1) stopping the operation of a slag flushing water system of an iron works, then emptying circulating water in a pipeline to be cleaned in the slag flushing water system, then connecting a cleaning agent suction well, a cleaning pump and the pipeline to be cleaned by using a temporary pipeline to form a circulating loop, and filling a scale cleaning agent into the cleaning agent suction well, wherein the scale cleaning agent is the scale cleaning agent in any one of claims 1-4;
(2) starting a cleaning pump to enable the scale cleaning agent to perform cleaning operation in the circulation loop formed in the step (1);
(3) and after the cleaning is finished, draining the sewage in the circulation loop, closing the temporary pipeline, stopping the cleaning pump, and then recovering the operation of the slag flushing water system of the iron works.
6. The method of claim 5, wherein the method comprises: in the step (1), the ratio of the mass of the scaling cleaning agent to the scaling mass in the pipeline to be cleaned is 2-5: 1.
7. The method of claim 5, wherein the method comprises: in the step (1), the selected pipelines to be cleaned are pipelines between a pump room and a blast furnace slag flushing port in a slag flushing water system of an iron works and pipelines between the pump room and a circulating water suction well, the used cleaning agent suction well is the circulating water suction well in the slag flushing water system of the iron works, the used cleaning pump is a circulating water pump of the pump room in the slag flushing water system of the iron works, the number of the used temporary pipelines is one, one end of the temporary pipeline is connected with the end part, close to the blast furnace slag flushing port, in the pipeline to be cleaned, and the other end of the temporary pipeline is connected with the circulating water suction well.
8. The method of claim 5, wherein the method comprises: in the step (2), the cleaning pump conveys the scaling cleaning agent at the maximum flow rate.
9. The method of claim 8, wherein the method comprises: in the step (2), the cleaning operation time of the scale cleaning agent in the circulation loop is 24-48 h.
10. The method of claim 5, wherein the method comprises: in the step (3), the time for discharging the sewage in the circulation loop is 2-4 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN109110933B (en) * | 2018-08-22 | 2021-05-04 | 江苏科利恩净水科技有限公司 | Low-phosphorus scale and corrosion inhibitor and preparation method thereof |
| CN111533229A (en) * | 2020-05-27 | 2020-08-14 | 昭仕（厦门）新材料有限公司 | Water treatment agent and preparation method thereof |
| CN111762883A (en) * | 2020-06-12 | 2020-10-13 | 上海净豚环保科技有限公司 | Anaerobic granular sludge scale inhibitor and preparation method and application thereof |
| CN113354109A (en) * | 2021-05-20 | 2021-09-07 | 大唐七台河发电有限责任公司 | Method for quickly cleaning scaling on circulating water cooling pipe wall of condenser |
| CN113789227B (en) * | 2021-09-17 | 2023-05-02 | 自然资源部天津海水淡化与综合利用研究所 | Calcium sulfate scale cleaning agent suitable for aluminum alloy heat transfer tube and preparation method and application thereof |
| CN114084923A (en) * | 2021-12-22 | 2022-02-25 | 上海电站辅机厂有限公司 | Hard scale cleaning device for hot method seawater desalination device |
| CN116622024B (en) * | 2022-10-10 | 2023-12-08 | 广东浪淘砂新型材料有限公司 | High-concentration scale inhibitor for cement-based high-alkali environment sensor and preparation method thereof |
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| CN101412567A (en) * | 2007-10-15 | 2009-04-22 | 潘洪涛 | Composite multi-component scale inhibitor for treating oil-field water and preparation thereof |
| CN102604617A (en) * | 2011-10-17 | 2012-07-25 | 中国石油化工股份有限公司 | Carbonate scale removing agent for oil-water well |
| CN104445654A (en) * | 2014-12-10 | 2015-03-25 | 苏州路路顺机电设备有限公司 | Method for preparing circulating water treatment agent |
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| CN101412567A (en) * | 2007-10-15 | 2009-04-22 | 潘洪涛 | Composite multi-component scale inhibitor for treating oil-field water and preparation thereof |
| CN102604617A (en) * | 2011-10-17 | 2012-07-25 | 中国石油化工股份有限公司 | Carbonate scale removing agent for oil-water well |
| CN104445654A (en) * | 2014-12-10 | 2015-03-25 | 苏州路路顺机电设备有限公司 | Method for preparing circulating water treatment agent |
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