CN101417843B - Secondary cooling water recycling process of steel plant continuous casting - Google Patents
Secondary cooling water recycling process of steel plant continuous casting Download PDFInfo
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- CN101417843B CN101417843B CN2008101436671A CN200810143667A CN101417843B CN 101417843 B CN101417843 B CN 101417843B CN 2008101436671 A CN2008101436671 A CN 2008101436671A CN 200810143667 A CN200810143667 A CN 200810143667A CN 101417843 B CN101417843 B CN 101417843B
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Abstract
The invention relates to a cyclic utilization technology for continuous casting secondary cooling water of steel plants, which comprises the following steps: the continuous casting secondary cooling water produced by cooling continuous casting equipment is collected in a whirling well through a sluiceway; in the whirling well, large grained iron scale is settled at the bottom and cleaned out of the well through a crown block; the swirling well effluent undergoing primary precipitation is injected to a chemical oil remover through a pump; an oil removal agent and a flocculating agent are respectively added to the chemical oil remover for removing the small grained iron scale, oil and colloid impurities in the wastewater, and the qualified wastewater after treatment flows into a hot well; an active bromine bactericidal algicide and a bactericidal algicide for controlling the growth of microorganism are added into the hot well; clean water is injected to a cooling tower through a water pump for cooling; the cooled clean water enters a cold well, and a scale corrosion inhibiter is added into the cold well; and the clean water in the cold well is sent to the continuous casting equipment for recycled use through using the pump. The technology has the advantages of stable water quality and obvious effects on water resource cyclic utilization and energy-saving and emission-reduction.
Description
[technical field]
The invention belongs to the steelworks technical field of waste water processing, relate to and a kind of continuous casting secondary cooling water is handled the back, handled the steel plant continuous casting secondary cooling water utilization process of the past continuous casting installation for casting recycle of back water pumping through overcooling, sterilization algae removal, water conditioning etc. again through chemical oil remover.
[background technology]
The total cycling rate of existing iron and steel enterprise waste water generally only reaches 40～60%, the basic not circulation that has and in line, and the not only wasting of resources, and environment caused serious destruction.Steel making working procedure is the key link of whole steel manufacture process in the Iron And Steel Industry, and continuous casting process is one of core process in the STEELMAKING PRODUCTION process.Along with the development of Iron and Steel Production, continuous casting technology is adopted by increasing iron and steel enterprise, and the continuous casting ratio of China rises significantly.Continuous casting process has saved the operation of die casting and breaking down cogging, and molten steel flows directly in the crystallizer of continuous caster, and liquid metal is sharply cooled off, and the steel billet of pulling out from the crystallizer afterbody enters secondary cooling zone, and secondary cooling zone is made of roller-way and water spray cooling apparatus.Owing to the enforcement of continuous casting process, simplified the process of working steel products, not only save initial cost and working cost in a large number, and reduce energy consumption, improve lumber recovery.
In casting process, supply water and play important effect, more and more higher to continuous caster water requirements in water quality in order to improve the quality of steel billet, the cooling performance quality of water directly has influence on the quality of steel billet and the work-ing life of crystallizer.
The characteristics of continuous casting secondary cooling water are that the water yield is big, temperature is high, and corrosion and fouling easily take place, and require very high to water quality and water technology.In process of production, two cold water spray water directly contact with continuous casting installation for casting, in the impurity band entry such as a large amount of iron scale particles, metallic dust, lubricating grease, these impurity are " bonding " very easily, be formed with " greasy filth " of big viscosity, greasy filth is easy to stick on pipeline, the watering equipment, and production has brought very big harm to continuous casting.As stick on the pipeline, will dwindle the effective cross sectional area of pipeline, reduce service discharge or increase the resistance of ducting, cause the metal underdeposit corrosion; If stick on the di-cold spray nozzle, plug nozzle reduces the cooling efficiency of two cold-zones easily, will have a strong impact on slab surface quality; If stick on the filter leaching material, stop up filtrate easily, cause filtrate " to harden ", filter " short stream ", strainer can't normally be moved, water quality deterioration forms vicious cycle, can influence the stopping production of producing even can cause continuous caster when serious.
In addition, if the continuous casting secondary cooling water after handling adopts and recycles, along with the raising of cycles of concentration, the following harm can appear: the one, and the separating out and adhere to of settling (mainly be dirt): be dissolved with hydrocarbonate in the natural water, this salt is the major ingredient that water coolant generation incrustation scale adheres to.In recirculating cooling water system, following reaction when its concentration reaches capacity state, can take place: Ca (HCO with recirculated cooling water evaporation, concentrated increasing in the concentration of hydrocarbonate
3)
2=CaCO
3↓+CO
2↑+H
2O.CaCO3 is deposited on pipe surface, forms fine and close lime scale, and its heat conductivility is very poor.Incrustation scale adheres to influences output, increases energy consumption, and when serious, then interchanger, pipeline are blocked.The 2nd, equipment corrosion: hardware life-time service recirculated cooling waters a large amount of in the system can corrode, and reduce service life of equipment even perforation, cause potential safety hazard.The 3rd, the growing and foundry loam of microorganism.Microorganism in the recirculated cooling water generally is meant bacterium and algae, and in fresh water, in general bacterium and algae are all less.But in recirculated water, because nutrient is concentrated, the rising of water temperature and sun exposure have created the condition of rapid breeding for bacterium and algae.A large amount of oozy mucus of bacterium can make dust impurity showy in the water and chemical precipitates etc. adhere to each other as tackiness agent, form slimy settling and stick on pipeline, filter screen, cooling tower, the nozzle.Foundry loam is adsorbed on the equipment, the flow of water coolant is reduced, and reduce cooling efficiency, when serious, pipeline can be blocked, and forces stop production to overhaul.
The domestic and international at present processing to continuous casting secondary cooling water mostly is three sections treatment schemees greatly, as shown in Figure 1, its processing mode is mainly by natural sedimentation, filter and remove suspended substances, oil removal, frizing, belt, tubular type absorption wet goods mode are adopted in oil removing, and use equipment mostly is oil trap, Oil scraper, belt oil removal machine, tubular type oil removal machine, floating drum oil trap etc.
Three sections treatment schemees are adopted in the continuous casting two cold water treatment, by secondary sedimentation, once filter and can remove most of iron scale and silt.Adopt the mechanical means deoiling effect not good, can only remove oil slick, can not remove oil in water emulsion.And contain quite a few oil in water emulsion in the continuous casting secondary cooling water and be difficult for sedimentary very tiny particle suspensions, these fine particle suspended substances and oil content are adsorbed " greasy filth " that forms big viscosity mutually in water, it is suspended in the water with colloidal state, neither precipitation is non-rising again, flow with water, stick on pipeline, watering equipment and the water treating equipment harm that causes equipment such as nozzle, pipeline, filtrate, line strainer to stop up, so water treatment poor effect.Also had steelworks change horizontal sedimentation tank into chemical oil remover afterwards, to reduce floor space, expectation simultaneously improves deoiling effect.But because the water yield fluctuation of continuous casting secondary cooling water system is frequent, the bad adaptability of water treatment agent, a large amount of suspended substance and greasy filth enter later process, still have a strong impact on the normal stably manufactured of Steel Plant's steel making working procedure.
[summary of the invention]
In order to overcome the above-mentioned shortcoming of prior art, the invention provides a kind of steel plant continuous casting secondary cooling water utilization process with water conditioning, water resources recycle and the obvious advantage of effects of energy saving and emission reduction.
The technical solution adopted for the present invention to solve the technical problems is: a kind of steel plant continuous casting secondary cooling water utilization process, cooling continuous casting secondary cooling water that continuous casting installation for casting produces is pooled to the eddy flow well through sluice, in the eddy flow well, make the macrobead iron scale be deposited on the shaft bottom, and clearly go out well outside by overhead traveling crane the macrobead iron scale; Eddy flow well water outlet through preliminary sedimentation is squeezed into chemical oil remover by pump, add degreaser and flocculation agent respectively at chemical oil remover, to remove waste water small particles iron scale, oil and colloidal impurity, handle qualified waste water and flow into thermal well, add the active bromine Biocidal algae-killing agent and the Biocidal algae-killing agent of the growth of controlling microbial at thermal well, then clear water is squeezed into cooling tower by water pump and cool, the clear water after the cooling enters the cold water well, and adds anti-incrustation corrosion inhibitor in the cold water well; Clear water in the cold water well recycles with being pumped to continuous casting installation for casting.
The iron scale impurity of disposing of sewage and precipitating in the described chemical oil remover enters sludge sump, and after clarification was handled in the sludge sump sedimentation, its supernatant liquid was returned chemical oil remover again and carried out recycle, the excess sludge reuse.
The chemical constitution of the degreaser that adds in described chemical oil remover and weight percent content thereof are Al
2O
3: 25～30%, Fe
2O
3: 2～4%, it adds concentration is 8～30PPM, its pH scope that is suitable for is 6～9.
The main ingredient of the flocculation agent that adds in described chemical oil remover is a polyacrylamide, and its molecular weight is greater than 1,000 ten thousand, and it adds concentration is 0.3～2.0PPM.
The main ingredient of the active bromine Biocidal algae-killing agent that adds at described thermal well is a sodium hypobromite, and the weight percent concentration of sodium hypobromite is 60～85%, and it adds concentration is 8～30PPM.
The main ingredient of the Biocidal algae-killing agent that adds at described thermal well is 5-chloro-2-methyl isothiazoline-3-ketone and 2-methyl-4-isothiazoline-3-ketone, and the ratio of the weight of the former with the latter is 3:1, and it adds concentration is 100～300PPM.
The prescription and the weight percent content thereof of the anti-incrustation corrosion inhibitor that adds in described cold water well are: 2-phosphonic acids butane-1,2,4-tricarboxylic acid: 23.0～26.0%, and 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid: 16.0～19.0%, ZnSO
4.7H
2O:12.0～16.0%, H
2SO
4: 2.0%, Sodium hexametaphosphate 99: 3.0～6.0%, all the other are water.
The concentration that adds of described anti-incrustation corrosion inhibitor is 40～80mg/L; Recirculating cooling water system should be controlled total phosphorus concentration between 6.0～8.0mg/L in operational process; If can not be controlled in this scope, can take following measure: when total phosphorus concentration during greater than 8.0mg/L, can dosing for some time; If total phosphorus concentration less than 6.0mg/L, then should be added medicament immediately.
The dosing method of described anti-incrustation corrosion inhibitor adopts the continuous dosing mode or impacts dosing method, and dosing speed G (kg/h) is calculated as follows: the G=medicament adds concentration * amount of makeup water/cycles of concentration * 1000.
The invention has the beneficial effects as follows: the steel-making continuous casting secondary cooling water has obtained recycle after chemical treatment, accomplished that total system do not have waste water and efflux, the running cost economical rationality, ensure safety, the steady running of steel-making continuous casting operation, greatly improved water treatment efficiency, reduce cost of water treatment, solved the difficult problem that iron and steel enterprise's continuous casting production often is forced to stop production and is overhauled, saved a large amount of maintenance spending expenses; Research and development of the present invention and successful Application have favorable economic benefit and environmental benefit to the energy-saving and emission-reduction of iron and steel enterprise.
[description of drawings]
Fig. 1 is three sections treatment scheme block diagrams of existing continuous casting secondary cooling water;
Structural representation of the present invention.
[embodiment]
The present invention is further described below in conjunction with drawings and Examples:
Referring to Fig. 2, a kind of steel plant continuous casting secondary cooling water utilization process, cooling continuous casting secondary cooling water that continuous casting installation for casting produces is pooled to the eddy flow well through sluice, utilize the isolating effect of hydrocyclone, in the eddy flow well, make the macrobead iron scale be deposited on the shaft bottom, and the macrobead iron scale gone out clearly outside the well by overhead traveling crane, directly be used for ironmaking; Eddy flow well water outlet through preliminary sedimentation is squeezed into chemical oil remover by pump, add degreaser and flocculation agent respectively at chemical oil remover, to remove waste water small particles iron scale, oil and colloidal impurity, the chemical constitution of the degreaser that adds in described chemical oil remover and weight percent content thereof are Al
2O
3: 25～30%, Fe
2O
3: 2～4%, it adds concentration is 8～30PPM, its pH scope that is suitable for is 6～9; The main ingredient of the flocculation agent that adds in described chemical oil remover is a polyacrylamide, and its molecular weight is greater than 1,000 ten thousand, and it adds concentration is 0.3～2.0PPM; To handle qualified waste water then and flow into thermal well, add the active bromine Biocidal algae-killing agent and the Biocidal algae-killing agent SS411YL of the growth of controlling microbial at thermal well, the main ingredient of the active bromine Biocidal algae-killing agent that adds at described thermal well is a sodium hypobromite, the weight percent concentration of sodium hypobromite is 60～85%, and it adds concentration is 8～30PPM; The main ingredient of the Biocidal algae-killing agent SS411YL that adds at described thermal well is 5-chloro-2-methyl isothiazoline-3-ketone and 2-methyl-4-isothiazoline-3-ketone, and the ratio of the weight of the former with the latter is 3:1, and it adds concentration is 100～300PPM; Then clear water is squeezed into cooling tower by water pump and cool, the clear water after the cooling enters the cold water well, and adds anti-incrustation corrosion inhibitor in the cold water well; Clear water in the cold water well recycles with being pumped to continuous casting installation for casting.The prescription and the weight percent content thereof of the anti-incrustation corrosion inhibitor that adds in described cold water well are: 2-phosphonic acids butane-1,2,4-tricarboxylic acid: 23.0～26.0%, and 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid: 16.0～19.0%, ZnSO
4.7H
2O:12.0～16.0%, H
2SO
4: 2.0%, Sodium hexametaphosphate 99: 3.0～6.0%, all the other are water; The concentration that adds of described anti-incrustation corrosion inhibitor is 40～80mg/L; Recirculating cooling water system should be controlled total phosphorus concentration between 6.0～8.0mg/L in operational process; If can not be controlled in this scope, can take following measure: when total phosphorus concentration during greater than 8.0mg/L, can dosing for some time; If total phosphorus concentration less than 6.0mg/L, then should be added medicament immediately; The dosing method of described anti-incrustation corrosion inhibitor adopts the continuous dosing mode or impacts dosing method, and dosing speed G (kg/h) is calculated as follows: the G=medicament adds concentration * amount of makeup water/cycles of concentration * 1000.
The iron scale impurity of disposing of sewage and precipitating in the described chemical oil remover enters sludge sump, and after clarification was handled in the sludge sump sedimentation, supernatant liquor was returned the chemical oil remover recycle again, the excess sludge reuse.
Clear water the present invention handles continuous casting secondary cooling water through chemical oil remover after again after processing such as overcooling, sterilization algae removal the past continuous casting installation for casting recycle of water pumping solved quality problem, the environmental issue of iron and steel enterprise's continuous casting two cold water system on the whole.For iron and steel enterprise, successful Application of the present invention can produce certain economic benefits, can produce great social benefit again; The present invention has fully recycled the useful matter-iron scale in the waste water again when handling waste water, accomplish utilization of waste material, turns waste into wealth, and really realizes cleaner production, recycling economy; Flocculation agent efficiently used herein had both met the requirement that the chemical oil remover sedimentation time is short, water yield variation is frequent, had reached the purpose of removing suspended substance and removing oil in water emulsion again; Anti-incrustation corrosion inhibitor used in the present invention makes full use of the synergistic function between the dissimilar water treatment agents, to improve the water treatment effect, reduces cost of water treatment; The present invention is directed to continuous casting two cold water system oil-containing, and be this particular case of open type recirculating cooling water system, suppress technical in the bacterium algae, use the brominated oxidisability biocide of oil resistant, efficient, wide spectrum, take to add stage by stage non-oxidative bactericide simultaneously, to prevent the microorganisms resistance.
The index that the present invention reached is:
1, after the circulating water treatment, water-quality guideline: oil≤5mg/l; PH value=7～9; Ss suspended solid≤20mg/l; Ferrous≤0.5mg/l.
2, corrosion of carbon steel speed≤0.125mm/a, copper corrosion speed≤0.005mm/a, Corrosion of Stainless Steel rate≤0.005mm/a.
3, cycling utilization of wastewater rate: greater than 98%.
4, the present invention is applied to iron and steel enterprise and can reduces a ton steel water loss: 5.81 cubes of/ton steel, produce about 3,136 ten thousand cubes of the annual water saving of enterprise of 5,500,000 tons of steel per year, and reduce 3480 tons of solid waste quantity dischargeds.
5, the present invention can satisfy the requirement of iron and steel enterprise's continuous casting two cold water circulation use fully, meets the needs that continuous caster is produced, and the conserve water resource reduces production costs, and avoids environmental pollution.
Claims (7)
1. steel plant continuous casting secondary cooling water utilization process, it is characterized in that: cooling continuous casting secondary cooling water that continuous casting installation for casting produces is pooled to the eddy flow well through sluice, in the eddy flow well, make the macrobead iron scale be deposited on the shaft bottom, and clearly go out well outside by overhead traveling crane the macrobead iron scale; Eddy flow well water outlet through preliminary sedimentation is squeezed into chemical oil remover by pump, add degreaser and flocculation agent respectively at chemical oil remover, to remove waste water small particles iron scale, oil and colloidal impurity, handle qualified waste water and flow into thermal well, add the active bromine Biocidal algae-killing agent and the Biocidal algae-killing agent of the growth of controlling microbial at thermal well, then clear water is squeezed into cooling tower by water pump and cool, the clear water after the cooling enters the cold water well, and adds anti-incrustation corrosion inhibitor in the cold water well; Clear water in the cold water well recycles with being pumped to continuous casting installation for casting;
The main ingredient of the active bromine Biocidal algae-killing agent that adds at described thermal well is a sodium hypobromite, and the weight percent concentration of sodium hypobromite is 60～85%, and it adds concentration is 8～30PPM;
The main ingredient of the Biocidal algae-killing agent that adds at described thermal well is 5-chloro-2-methyl isothiazoline-3-ketone and 2-methyl-4-isothiazoline-3-ketone, and the ratio of the weight of the former with the latter is 3: 1, and it adds concentration is 100～300PPM.
2. steel plant continuous casting secondary cooling water utilization process as claimed in claim 1, it is characterized in that: the iron scale impurity of disposing of sewage and precipitating in the described chemical oil remover enters sludge sump, after clarification is handled in the sludge sump sedimentation, its supernatant liquid is returned chemical oil remover again and is carried out recycle, the excess sludge reuse.
3. steel plant continuous casting secondary cooling water utilization process as claimed in claim 1 or 2, it is characterized in that: the chemical constitution of the degreaser that adds in described chemical oil remover and weight percent content thereof are Al
2O
3: 25～30%, Fe
2O
3: 2～4%, it adds concentration is 8～30PPM, its pH scope that is suitable for is 6～9.
4. steel plant continuous casting secondary cooling water utilization process as claimed in claim 1 or 2, it is characterized in that: the main ingredient of the flocculation agent that adds in described chemical oil remover is a polyacrylamide, and its molecular weight is greater than 1,000 ten thousand, and it adds concentration is 0.3～2.0PPM.
5. steel plant continuous casting secondary cooling water utilization process as claimed in claim 1, it is characterized in that: the prescription and the weight percent content thereof of the anti-incrustation corrosion inhibitor that adds in described cold water well are: 2-phosphonic acids butane-1,2,4-tricarboxylic acid: 23.0～26.0%, 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid: 16.0～19.0%, ZnSO
47H
2O:12.0～16.0%, H
2SO
4: 2.0%, Sodium hexametaphosphate 99: 3.0～6.0%, all the other are water.
6. steel plant continuous casting secondary cooling water utilization process as claimed in claim 5 is characterized in that: the concentration that adds of described anti-incrustation corrosion inhibitor is 40～80mg/L; Recirculating cooling water system should be controlled total phosphorus concentration between 6.0～8.0mg/L in operational process; If can not be controlled in this scope, take following measure: when total phosphorus concentration during greater than 8.0mg/L, wouldn't dosing for some time; If total phosphorus concentration less than 6.0mg/L, then should be added medicament immediately.
7. as claim 5 or 6 described steel plant continuous casting secondary cooling water utilization process, it is characterized in that: the dosing method of described anti-incrustation corrosion inhibitor adopts the continuous dosing mode or impacts dosing method, dosing speed G is calculated as follows: the G=medicament adds concentration * amount of makeup water/cycles of concentration * 1000, and the unit of dosing speed G is kg/h.
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|---|---|---|---|
| CN2008101436671A CN101417843B (en) | 2008-11-21 | 2008-11-21 | Secondary cooling water recycling process of steel plant continuous casting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101436671A CN101417843B (en) | 2008-11-21 | 2008-11-21 | Secondary cooling water recycling process of steel plant continuous casting |
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| CN101417843A CN101417843A (en) | 2009-04-29 |
| CN101417843B true CN101417843B (en) | 2011-01-19 |
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ID=40628871
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| CN102249473A (en) * | 2011-05-25 | 2011-11-23 | 中色科技股份有限公司 | Method for utilizing waste heat of turbid circulating backwater of casting machines |
| CN102276096B (en) * | 2011-07-22 | 2012-08-01 | 宝钢工程技术集团有限公司 | Treatment process and treatment system of circulating water for fine cooling of surface of cold-rolled silicon steel |
| CN102557385A (en) * | 2012-02-08 | 2012-07-11 | 韶关市雅鲁环保实业有限公司 | Treatment process of sludge from turbid circulating system of steel enterprise hot rolling factory |
| CN102730919A (en) * | 2012-06-20 | 2012-10-17 | 内蒙古包钢钢联股份有限公司 | Method for processing sludge in steel rolling direct cooling recirculated cooling water system |
| CN103342407B (en) * | 2013-07-25 | 2014-08-27 | 武汉钢铁(集团)公司 | Method for removing oil turbidity in circulating cooling spray water in continuous casting technology |
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| CN104261609A (en) * | 2014-10-10 | 2015-01-07 | 重庆钢铁股份有限公司 | Continuous casting turbid circulating water treatment system and technology |
| CN104710070A (en) * | 2015-02-28 | 2015-06-17 | 江苏高科物流科技股份有限公司 | Water treatment device for cooling tower |
| CN104986893A (en) * | 2015-07-03 | 2015-10-21 | 江苏永钢集团有限公司 | Steelmaking cooling water purifying and recycling device |
| CN105000685B (en) * | 2015-07-30 | 2017-01-25 | 江苏华安科研仪器有限公司 | Chemical water treatment agent |
| CN105239075A (en) * | 2015-10-10 | 2016-01-13 | 扬州大学 | Compound corrosion inhibitor for red copper material in circulating cooling water system |
| CN105776657A (en) * | 2016-03-21 | 2016-07-20 | 北京绿恒科技有限公司 | Short-process continuous-casting turbid circulating water treatment technology |
| CN108947001A (en) * | 2018-06-27 | 2018-12-07 | 张家港浦项不锈钢有限公司 | A kind of low chlorine ion stainless steel continuous casting secondary cooling water system |
| CN109990442A (en) * | 2019-02-25 | 2019-07-09 | 江苏泰瑞耐火有限公司 | Make steel the intelligent temperature detection and adjustment system of mouth of a river factory |
| CN111825293A (en) * | 2019-04-19 | 2020-10-27 | 辽宁海蓝科技工程有限公司 | Sludge-water separation process for cyclone tank of steel mill |
| CN110590048A (en) * | 2019-09-20 | 2019-12-20 | 中冶东方工程技术有限公司 | Continuous casting turbid circulating water treatment equipment and method |
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