CN104649422B - A kind of composite scale-inhibiting corrosion inhibitor and preparation method who is applied to blast furnace closed circulating water system - Google Patents
A kind of composite scale-inhibiting corrosion inhibitor and preparation method who is applied to blast furnace closed circulating water system Download PDFInfo
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- CN104649422B CN104649422B CN201510019452.9A CN201510019452A CN104649422B CN 104649422 B CN104649422 B CN 104649422B CN 201510019452 A CN201510019452 A CN 201510019452A CN 104649422 B CN104649422 B CN 104649422B
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- blast furnace
- circulating water
- water system
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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
- C02F5/12—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 nitrogen
- C02F5/125—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 nitrogen combined with inorganic substances
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/08—Corrosion inhibition
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/20—Prevention of biofouling
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/22—Eliminating or preventing deposits, scale removal, scale prevention
Abstract
The invention provides a kind of composite scale-inhibiting corrosion inhibitor and preparation method who is applied to blast furnace closed circulating water system, provide one to be applicable to high alkalinity, high rigidity, high-temperature, the composite slow-corrosion scale resistor of the blast furnace closed circulating water system of strong fouling tendency, its constituent and mass fraction are: potassium pyrophosphate: 15～25 parts, bi-imidazoline quaternary ammonium salt: 5～15 parts, concentration is 75% phosphoric acid: 10～20 parts, 0.1～1 part of BTA, poly-epoxy succinic acid: 15～25 parts, water: 10～20 parts, pH value conditioning agent: 1～10 part, preparation method adds in reactor successively according to above-mentioned mass fraction at normal temperatures, stir and evenly mix rear leaving standstill. compared with prior art, the invention has the beneficial effects as follows: film forming is stable, efficiency is high, cost is low, consumption is few, scale inhibitor is effective, have the effect that suppresses microorganism simultaneously concurrently, the withstand high temperatures of antisludging agent own is difficult for decomposing.
Description
Technical field
The present invention relates to water-treatment technology field, relate in particular to a kind of composite scale-inhibiting corrosion inhibitor that is applied to blast furnace closed circulating water systemAnd preparation method.
Background technology
Blast furnace ironmaking closed cycle water system is as the important circulation of the body of heater of cooling blast furnace, furnace wall, furnace bottom, and it is heavyThe property wanted is self-evident, and closed cycle water system needs cooling position temperature high, at present domestic blast furnace ironmaking closed circulating water systemSystem is used demineralized water conventionally, adds nitrite or adds molybdic acid salt corrosion inhibiter. But what adopt in certain areas isCarry out the condition of water quality that the water hardness is higher, use separately nitrite just can not meet the demands, it only has the effect of inhibition, does not haveThere is the effect of scale inhibition, and be not suitable for the higher water system of temperature, and add for a long time nitrite and also can bring microorganismToo high harm, and very easily at the encrustation blocking pipe of water pipe. And use molybdate corrosion inhibiter anticorrosion-antiscaling effect all thanBetter, but cost is higher, is not suitable for larger circulation and uses.
Summary of the invention
The object of this invention is to provide a kind of composite scale-inhibiting corrosion inhibitor and preparation method who is applied to blast furnace closed circulating water system, overcomeThe shortcoming of prior art, provides the composite slow-corrosion scale resistor that a kind of film forming is stable, efficiency is high, cost is low, be applicable to high alkalinity,The blast furnace closed circulating water system of high rigidity, high-temperature, strong fouling tendency has the effect that suppresses microorganism concurrently, antisludging agent itself simultaneouslyWithstand high temperatures is difficult for decomposing.
For achieving the above object, the present invention realizes by the following technical solutions:
Be applied to a composite scale-inhibiting corrosion inhibitor for blast furnace closed circulating water system, its constituent and mass fraction are: potassium pyrophosphate:15～25 parts, bi-imidazoline quaternary ammonium salt: the phosphoric acid that 5～15 parts, concentration are 75%: 10～20 parts, BTA 0.1～1 part, poly-epoxy succinic acid: 15～25 parts, water: 10～20 parts, pH value conditioning agent: 1～10 part.
Described pH value conditioning agent is NaOH.
Be applied to a preparation method for the composite scale-inhibiting corrosion inhibitor of blast furnace closed circulating water system, by poly-epoxy succinic acid, two imidazolesPhosphoric acid that hyamine, concentration are 75%, water, potassium pyrophosphate, BTA, pH value conditioning agent under normal temperature according to upperState mass fraction and add successively in reactor, stir and evenly mix and leave standstill and obtain one of the present invention and be applied to blast furnace closed circulating water system afterwardsComposite scale-inhibiting corrosion inhibitor.
The phosphoric acid, the water that are first 75% by poly-epoxy succinic acid, bi-imidazoline quaternary ammonium salt, concentration join in reactor, stirAfter 30 minutes, then add potassium pyrophosphate, BTA stirring that it is dissolved completely, continue to add pH value conditioning agent, stirMix and mix the rear a kind of composite scale-inhibiting corrosion inhibitor that is applied to blast furnace closed circulating water system of the present invention that leaves standstill and obtain.
Compared with prior art, the invention has the beneficial effects as follows:
1, the closed circuit high alkalinity of particularly suitable blast furnace, high rigidity, high-temperature, strong fouling tendency water quality, scale inhibition and corrosion inhibition are equalExcellent.
2, between each component, there is good concertedness.
3, complexing agent cost of the present invention is low, and consumption is few, easily composite, and good stability is very square in operation and managementJust, consumption is only 35mg/l.
4, complexing agent of the present invention uses potassium pyrophosphate to substitute nitrite use, has reduced the harm that microorganism brings,And can with hard water in Ca2+、Mg2+Thereby form stable complex compound softening of water, take out stains.
Detailed description of the invention
Below in conjunction with Figure of description, the present invention is described in detail, but should be noted that enforcement of the present invention be not limited toUnder embodiment.
Be applied to a composite scale-inhibiting corrosion inhibitor for blast furnace closed circulating water system, its constituent and mass fraction are: potassium pyrophosphate:15～25 parts, bi-imidazoline quaternary ammonium salt: the phosphoric acid that 5～15 parts, concentration are 75%: 10～20 parts, BTA 0.1～1 part, poly-epoxy succinic acid: 15～25 parts, water: 10～20 parts, pH value conditioning agent: 1～10 part.
Described pH value conditioning agent is NaOH.
Be applied to a preparation method for the composite scale-inhibiting corrosion inhibitor of blast furnace closed circulating water system, by poly-epoxy succinic acid, two imidazolesPhosphoric acid that hyamine, concentration are 75%, water, potassium pyrophosphate, BTA, pH value conditioning agent under normal temperature according to upperState mass fraction and add successively in reactor, stir and evenly mix and leave standstill and obtain one of the present invention and be applied to blast furnace closed circulating water system afterwardsComposite scale-inhibiting corrosion inhibitor.
The phosphoric acid, the water that are first 75% by poly-epoxy succinic acid, bi-imidazoline quaternary ammonium salt, concentration join in reactor, stirAfter 30 minutes, then add potassium pyrophosphate, BTA stirring that it is dissolved completely, continue to add pH value conditioning agent, stirMix and mix the rear a kind of composite scale-inhibiting corrosion inhibitor that is applied to blast furnace closed circulating water system of the present invention that leaves standstill and obtain.
Potassium pyrophosphate is one of host of this composite scale-inhibiting corrosion inhibitor, is called again tetrapotassium pyrophosphate, it can with hard water in Ca2+、Mg2+Thereby form stable complex compound softening of water, when particularly blast furnace closed circulating water system adopts the higher moisturizing of hardness, itCan play and reduce the effect of hardness, and potassium pyrophosphate not only there is chelating peptizaiton, also there is corrosion inhibition, energy simultaneouslyEnough form uniform diaphragm in metal surface.
The preferred mass umber of potassium pyrophosphate in a kind of composite scale-inhibiting corrosion inhibitor that is applied to blast furnace closed circulating water system is 17-23Part.
Bi-imidazoline quaternary ammonium salt be this composite scale-inhibiting corrosion inhibitor host two, what the present invention selected is, and Qinhuangdao triumph chemical industry hasThe DLP-70 that limit company produces. This compound is without special penetrating odor, Heat stability is good, and toxicity is low, has goodBiological degradability, is beneficial to environmental protection, and its molecule covering power of synthetic bi-imidazoline quaternary ammonium salt is strong, and inhibition efficiency is high.
The good corrosion mitigating effect of bi-imidazoline quaternary ammonium salt is the result of many factors coordinative role: 1) when metal and acid mediumWhen contact, this corrosion inhibiter can form monomolecular film in metal surface; 2) due to the N atom of the imidazoline in this corrosion inhibiterAfter quaternized, become cation macromolecular, be easy to be adsorbed by the metal surface active site of surface band negative electrical charge, to hydrogen fromElectron discharge has very large inhibitory action, thereby has effectively suppressed cathode reaction; 3) the large molecule of quaternary ammonium salt has very large coveringEffect. The corrosion mitigating effect of imidazoline increases with the increase of electron density in imidazole ring, if introduce nonpolar to imidazoline moleculeGroup, not only can change by inductive effect the adsorption capacity of central atom, but also can increase its hydrophobic effect, hasBe beneficial to formation adsorbed film, improve corrosion inhibition.
The preferred mass umber of bi-imidazoline quaternary ammonium salt in a kind of composite scale-inhibiting corrosion inhibitor that is applied to blast furnace closed circulating water systemFor 7-13 part.
Poly-epoxy succinic acid be this composite scale-inhibiting corrosion inhibitor host three, be a kind of without phosphorus Green Water Treatment Reagents without nitrogen, itBe to insert oxygen molecule in the molecule of poly class antisludging agent, make it have good scale-inhibiting properties, strong to calcium sequestration capacity,Again without phosphorus without nitrogen, be easy to biodegradation. Be applicable to the cooling water system of high alkalinity, high rigidity, high-temperature condition, such pointPowder is a kind of high efficiency dirt dispersion agent that has corrosion inhibition concurrently, can play very large resistance calcium carbonate in blast furnace closed circulating water systemThe effect of dirt.
The preferred mass umber of poly-epoxy succinic acid in a kind of composite scale-inhibiting corrosion inhibitor that is applied to blast furnace closed circulating water system is18-23 part.
Between above three kinds of hosts, there is good synergistic function, further improved its anticorrosion-antiscaling effect after composite.
Phosphoric acid is a kind of common inorganic acid, is middle strong acid. Be generally used for cleaning agent, also can be used as compound corrosion inhibitor, itCan generate in metal surface the phosphate film of indissoluble, to protect metal to avoid corrosion.
The preferred mass umber of phosphoric acid in a kind of composite scale-inhibiting corrosion inhibitor that is applied to blast furnace closed circulating water system is 13-17 part.
BTA (BTA), its anion and cuprous ion form a kind of complex compound of insoluble stabilizer pole. ThisComplex compound is adsorbed on metal surface, makes metal obtain protection thereby formed one deck diaphragm stable, inertia. It is rightSuppress copper corrosion and there is good effect, especially corrosion mitigating effect the best in closed cycle cooling water system.
PH value conditioning agent can regulate a kind of pH value of the composite scale-inhibiting corrosion inhibitor that is applied to blast furnace closed circulating water system, makes compoundAnti-incrustation corrosion inhibitor is more stable.
Embodiment 1: be according to 4 kinds of formulas of proportioning mass fraction of the present invention and preparation method's preparation in table 1.
Table 1:
| Component (part) | Formula A | Formula B | Formula C | Formula D |
| Potassium pyrophosphate | 15 | 17 | 25 | 20 |
| Bi-imidazoline quaternary ammonium salt | 15 | 13 | 10 | 7 |
| Poly-epoxy succinic acid | 25 | 20 | 18 | 21 |
| BTA | 0.5 | 0.8 | 0.6 | 0.5 |
| Phosphoric acid | 20 | 13 | 10 | 15 |
| NaOH | 7 | 8 | 5 | 6 |
| Water | 15 | 17 | 18 | 14 |
Be analog blast furnace closed cycle water quality condition in table 2.
Table 2:
Under condition of water quality shown in table 2, water temperature is 60 DEG C, and shown in use table 1, formula carries out corrosion inhibition test, dry run72 hours, by " mensuration of water treatment agent corrosion inhibition--rotary hanging plate method " (GB-T18175-2000) standard execution. ?After use different formulations, the water quality corrosion of carbon steel rate of gained blast furnace closed circulating water system is in table 3.
Table 3:
| Chemical feeding quantity 35mg/l | Formula A | Formula B | Formula C | Formula D |
| Carbon steel mm/a | 0.0289 | 0.0223 | 0.0266 | 0.0278 |
The corrosion of carbon steel rate of B of can finding to fill a prescription from table 3 is organized slightly well compared with other.
Be that formula B adds the corrosion of carbon steel rate under concentration in difference in table 4, can find out from data shown in table 4: do not addThe carbon steel lacing film seriously corroded of medicament, formula B dosage is in the time of 35mg/l, and corrosion of carbon steel speed is 0.0223mm/a, far awayBe less than GB (GB50050--2007) 0.075mm/a, and dosage is also less.
Table 4:
By " mensuration of water treatment agent scale-inhibiting properties--tosca method " (GB-T16632-2008) standard carry out hinderDirt rate is measured. Measurement result, in table 5, can verify from data shown in table 5, and each group of formula all has good scale inhibition effectReally, and completely comply with the national standard requirements.
Table 5:
| Chemical feeding quantity 30mg/l | Formula A | Formula B | Formula C | Formula D |
| Scale inhibition performance % | 97.31 | 98.1 | 97.75 | 96.62 |
Embodiment 2: be production scene blast furnace closed cycle water quality condition in table 6. Under this condition of water quality, production scene waterBetween 60-70 DEG C of temperature, use composite scale-inhibiting corrosion inhibitor of the present invention, carry out scene and follow the tracks of practical effect, running time31 days, can reach 0.0275mm/a to corrosion of carbon steel speed, and check from equipment feedback parameter and maintenance recirculated water in-service pipelineDo not find the corrosion and scaling imagination, on-the-spot result of use is good.
Table 6:
A kind of composite scale-inhibiting corrosion inhibitor that is applied to blast furnace closed circulating water system of the present invention is for the closed circuit high-temperature of blast furnace, heightBasicity, high hardness water design, be applicable to pH value in 6.5-9.0 scopes, has adaptive automatic control function. Confirm through experimentThe scale inhibition performance of temperature in the time of 60 DEG C can reach more than 97%, has excellent inhibition and scale inhibition and dispersion performance.
Claims (4)
1. a composite scale-inhibiting corrosion inhibitor that is applied to blast furnace closed circulating water system, is characterized in that, its constituent and qualityUmber is: potassium pyrophosphate: 15～25 parts, bi-imidazoline quaternary ammonium salt: the phosphoric acid that 5～15 parts, concentration are 75%: 10～20Part, 0.1～1 part of BTA, poly-epoxy succinic acid: 15～25 parts, water: 10～20 parts, pH value conditioning agent: 1～10 parts.
2. a kind of composite scale-inhibiting corrosion inhibitor that is applied to blast furnace closed circulating water system according to claim 1, its feature existsIn, described pH value conditioning agent is NaOH.
3. the preparation method of a kind of composite scale-inhibiting corrosion inhibitor that is applied to blast furnace closed circulating water system claimed in claim 1, itsBe characterised in that the phosphoric acid, water, potassium pyrophosphate, the benzo that are 75% by poly-epoxy succinic acid, bi-imidazoline quaternary ammonium salt, concentrationTriazole, pH value conditioning agent add successively in reactor according to above-mentioned mass fraction under normal temperature, stir and evenly mix to leave standstill and get final product afterwardsA kind of composite scale-inhibiting corrosion inhibitor that is applied to blast furnace closed circulating water system of the present invention.
4. the preparation method of a kind of composite scale-inhibiting corrosion inhibitor that is applied to blast furnace closed circulating water system according to claim 3,It is characterized in that, the phosphoric acid, the water that are first 75% by poly-epoxy succinic acid, bi-imidazoline quaternary ammonium salt, concentration join reactorIn, stir after 30 minutes, then add potassium pyrophosphate, BTA stirring that it is dissolved completely, continue to add pH value to adjustJoint agent, stirs and evenly mixs the rear a kind of composite scale-inhibiting corrosion inhibitor that is applied to blast furnace closed circulating water system of the present invention that leaves standstill and obtain.
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| CN111073618A (en) * | 2020-01-03 | 2020-04-28 | 陕西日新石油化工有限公司 | Solid corrosion inhibitor capable of being released uniformly and preparation method thereof |
| CN111705319A (en) * | 2020-06-19 | 2020-09-25 | 德蓝水技术股份有限公司 | Environment-friendly corrosion inhibitor for circulating water closed system and preparation method thereof |
| CN113620440A (en) * | 2021-08-09 | 2021-11-09 | 朗森特环境科技(山东)有限公司 | Corrosion and scale inhibitor for scale precipitation and removal of oil extraction and transportation equipment and preparation method thereof |
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| KR20020039296A (en) * | 2002-04-26 | 2002-05-25 | 유정근 | The method of manufacturing compositions for inhibiting corrosions influenced by electrochemical and microbiological environment in arranging hot water-pipe line |
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| CN102134130A (en) * | 2011-01-24 | 2011-07-27 | 湖北中泰环境技术有限公司 | Scale and corrosion inhibitor for treating circulating cooling water |
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| CN104163510A (en) * | 2014-07-26 | 2014-11-26 | 青岛启源振东电气有限公司 | Scale inhibitor for mechanical equipment |
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Patent Citations (7)
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| US4409121A (en) * | 1980-07-21 | 1983-10-11 | Uop Inc. | Corrosion inhibitors |
| KR20020039296A (en) * | 2002-04-26 | 2002-05-25 | 유정근 | The method of manufacturing compositions for inhibiting corrosions influenced by electrochemical and microbiological environment in arranging hot water-pipe line |
| CN102083757A (en) * | 2008-08-05 | 2011-06-01 | 栗田工业株式会社 | Boiler water treatment agent and water treatment process |
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Address after: 114001 No.14 Hengye street, Qianshan District, Anshan City, Liaoning Province Patentee after: Angang Litian (Anshan) water treatment Co.,Ltd. Address before: 114001 No.14 Hengye street, Qianshan District, Anshan City, Liaoning Province Patentee before: ANGANG BK GIULINI WATER TREATMENT Co.,Ltd. |