CN102030450B - Method for utilizing municipal sludge as raw material of steel industrial sintering ore - Google Patents
Method for utilizing municipal sludge as raw material of steel industrial sintering ore Download PDFInfo
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- CN102030450B CN102030450B CN2010105029991A CN201010502999A CN102030450B CN 102030450 B CN102030450 B CN 102030450B CN 2010105029991 A CN2010105029991 A CN 2010105029991A CN 201010502999 A CN201010502999 A CN 201010502999A CN 102030450 B CN102030450 B CN 102030450B
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Abstract
The invention relates to a method for utilizing municipal sludge as a raw material of a steel industrial sintering ore and belongs to the technical fields of harmless treatment and high-additional-value utilization of municipal solid waste. The method comprises the following steps of: mixing the municipal sludge and quicklime according to a ratio; drying and dehydrating the mixture to obtain calcified sludge; adding the calcified sludge into sintering raw materials with correspondingly adjusted components according to a certain ratio and a certain mode, and allowing the mixture to enter the sintering process with other sintering raw materials; and producing the sintering core products serving as iron-making raw materials. The method has the advantages that: the lime calcified municipal sludge is added, so the sludge treatment cost is reduced and the secondary pollution problem during the sludge treatment is solved; the harmless treatment and the recycling utilization of municipal solid waste are realized; and the calcified sludge is added, so that the vertical sintering speed, the finished product ratio and the utilization coefficient can be effectively increased in the process of sintering the sintering core, the added amount of flux and fuel in the sintering raw materials is reduced, the raw material cost is reduced, and multiple purposes are fulfilled.
Description
Technical field
The invention belongs to the useless admittedly harmlessness disposing in city and utilize technical field, particularly a kind of municipal sludge is as the method for utilizing of Iron And Steel Industry agglomerate raw material.
Background technology
Municipal sludge is the product in the municipal wastewater treating processes of city, and a part is produced by the sewage direct separation, and another part produces in sewage treatment process.The Eleventh Five-Year Plan period, China includes restrictive index in " energy-saving and emission-reduction COD ", and the municipal sewage treatment development is rapid, and municipal sludge produces total amount to be increased fast.A large amount of municipal sludges need through timely processing, reduce mud stacking amount, avoid environmental pollution.In recent years; Country more and more payes attention to the mud problem in city; 2009; House and town and country construction portion, Environmental Protection Department, three departments of the Ministry of Science and Technology unite and have issued " the urban wastewater treatment firm sludge treatment is disposed and pollutent Prevention Technique policy (try) " (building the city [2009] No. 23), and proposing the target that sludge treatment disposes is minimizing, the stabilization and innoxious of realization mud; Encourage to reclaim and utilize the energy and the resource in the mud.Adhere under the prerequisite of safety, environmental protection and economy, realizing the treatment and disposal and the comprehensive utilization of mud, the purpose that reaches energy-saving and emission-reduction and develop a circular economy.
Municipal sludge has the water ratio height, and noxious pollutant content is high, is prone to produce characteristics such as foul gas.Different treatment stage mud has different water ratio, and wherein gravity thickened sludge water ratio is about 98%, and the mechanical dehydration moisture percentage in sewage sludge is about 80%, and the free water in the mud can be removed by mechanical force, and unfree water is difficult to further remove through mechanical system.High water-containing sludge transport with the landfill process in difficulty comparatively, and increased garbage loading embeading factory processing load to percolate, water ratio is not more than 40% in the general requirement transportation.
In the mode of multiple reduction moisture percentage in sewage sludge, lime drying and other treatment technology has efficiently, economy, advantage that working cost is low, can avoid percolate to leak, and significantly reduces advantages such as water ratio, is widely used.Its principle of work is: after unslaked lime is added mud, generate the slaked lime consume water with the water reaction on the one hand, exothermic heat of reaction is impelled moisture evaporation on the other hand, significantly reduces moisture percentage in sewage sludge.In addition, the pathogenic microorganism in the mud can also be effectively killed in the adding of unslaked lime, reduces second environmental pollution.
For the disposal of municipal sludge, utilize the aspect; Encouraging to reclaim and utilize the energy, resource in the mud is an important content of following sludge treatment development trend; Comparatively speaking; In all Sludge Disposal Techniques, it is the suitable method of present sludge reduction, harmlessness disposing that high-temperature treatment and " resource utilization " are utilized technology.At present; Adopt high-temperature treatment to utilize the patented technology of mud more; As being raw material baking ceramsite, system sludge brick, material of construction and eco-cement etc. with mud, but the shortcoming that exists is that the disposal time is long, is prone to the generation secondary pollution; And disposal costs is higher, and the introducing of mud improves the performance of starting materials and do not have help.And through the municipal sludge after the lime mummification disposal; Its water cut and organic content reduce greatly; And wherein also contain a large amount of CaO components; And some remaining combustible organic matter and Mierocrystalline celluloses, the CaO component can be used as the flux in the raw materials for sintering, and remaining organic matter and some fibre element can serve as raw material in sintering process.Because the CaO component in the mud mixes with a small amount of combustiblesubstance; Be equivalent to the even thorough mixing between flux and the fuel; Dewatered sludge is utilized in raw materials for sintering, not only can dispose a large amount of mud that produce in the municipal effluent disposal process fast, the minimizing of realization mud and innoxious; The resource and the energy in effective reuse lime calcification mud; And allocate into behind the dewatered sludge because the equilibrium of flux and fuel combines, can significantly improve the sintering character of agglomerate, so have bright development prospect.
The characteristics of China's iron ore deposit are that lean ore and complex ore are in the majority; Therefore China's sintering industry iron-bearing material is main with thin concentrate, but the shortcoming of fine ore sintering is: the ventilation property of the fine ore sintering bed of material is poor, causes sinter quality relatively poor; Output is on the low side, and sintering energy consumption is higher.In recent years, along with the development of Iron And Steel Industry, blast furnace is increasingly high to the grade requirement of agglomerate, and the many sintering plant superfluxed sinters of China have reached or near 60% high ferro grade, and its SiO
2Content drops to about 4%, but the intensity of this high basicity high iron low silicon agglomerate awaits further raising, and its sintering burnup also needs further to reduce.Therefore; How to handle the sintering problem of higher-grade fine grinding concentrate, especially how to improve the ventilation property of sinter bed, just become present stage sintering process problem anxious to be solved; Research thinks that the best approach of improving permeability of sintering material bed is to adopt the pellet sintering law technology.The pellet sintering method is the fine fodder sintering process; General compound with the fine grinding iron ore concentrate adds a certain amount of slaked lime (or unslaked lime powder) and makes sticker; Mixing and water adding causes epigranular in disk or drum pelletizer then; Diameter is about the bead material more than 3 millimeters, and return mine with coarse grain again, thick coke powder etc. mixed, and carries out negative pressure igniting down draft sintering.The pellet sintering method is strong to the flexibility of raw material; Can effectively solve the problem that it is difficult that the higher-grade concentrate is granulated; Therefore can improve the iron grade of sintering finished ores, bead epigranular, the intensity that in addition adopts the pellet sintering method to make is good, burnup is low, thereby makes the sinter bed gas-flow resistance reduce; So can significantly improve permeability of sintering material bed, help the enforcement of the thick bed of material, hyperoxia position and low-temperature sintering operating duty.Why the pellet sintering method can improve the sintering character of fine grinding iron ore concentrate effectively; Be because its air-flow that has improved in the bed of material distributes; The unit time increases through the airshed of the unit cross section bed of material during negative pressure exhausting, makes steam partial pressure reduce, and corresponding dew point reduces; Thereby reduce the material layer lower part condensation water quantity, can prevent effectively that material layer lower part from forming excessive moistening layer.Considers in the pellet sintering and need allocate the kemidol end into, and lime calcification mud has fine size, characteristic that CaO content is high, thus mud when allocating agglomerate into except that adopting usual manner allocates into, can also allocate use into as the pellet sintering raw material.
Through document and patent retrieval; Allocate the research that raw materials for sintering prepares the agglomerate utilization into for mud 1 piece of patent is arranged; Chinese patent 200910241914.6 proposes a kind of with municipal sludge and the clay method that is equipped with sintered material of ferrous iron containing metallurgical dust; Proposition is used municipal sludge with allocating in the agglomerate after metallurgical dust mud mixes, granulates, and prepared particle has preferable performance.But in the above-mentioned patent,, be not easy to extensive disposal, utilize municipal sludge because the ratio that metallurgical dust mud is allocated in sintering is lower.Therefore; Lime calcification mud is carried out pre-treatment, adopts the different agglomerate modes of allocating into then, as directly allocate into, repeatedly divide add allocate into, pre-prepared small-particle sintered material (pellet sintering) etc.; With allocating in the raw materials for sintering of larger proportion, can keep or even improve sintering performance simultaneously.
Traditional disposal options such as the modes such as landfill, compost and burning of municipal sludge, and some other disposal options at present exist land occupation, contaminated land environment, the high weak point of disposal costs like system sludge brick, material of construction etc.,
Summary of the invention
The object of the present invention is to provide the utilize method of a kind of municipal sludge as Iron And Steel Industry agglomerate raw material; Overcome present municipal sludge landfill, compost and burning, and system sludge brick, material of construction etc. exist land occupation, contaminated land environment, the high deficiency of disposal costs.
Its principle of the present invention is: lime calcification mud contains a large amount of CaO components and a certain amount of combustibleconstituents, and CaO component and combustibleconstituents fine size, is evenly distributed, each other closely contact; The lime calcification mud fine-grained powder of preset proportion is added in the raw materials for sintering; Reduce flux CaO and fuel input in the raw materials for sintering according to calcification mud composition and adding proportion simultaneously; The proportioning material is mixed, after the granulation, carries out sintering circuit and prepare agglomerate.
The present invention is that (allocation ratio of municipal sludge is 60～90wt% in proportion with municipal sludge and unslaked lime; The allocation ratio of unslaked lime is 10～40wt%) to mix, and after drying, processed, obtains calcification mud, again with calcification mud by a certain percentage and certain way; Allocate among the raw materials for sintering of the corresponding adjustment of composition; And get into sintering circuit with other raw materials for sintering and handle, final production agglomerate product is as iron-smelting raw material.
Calcification mud size range 0.05～3mm of the present invention, water ratio scope 0.01～20wt%, calcification mud allocation ratio accounts for 0.1～10wt% of raw materials for sintering total amount.The mode that calcification mud is allocated among the raw materials for sintering is after calcification mud is crushed to 0.05～3mm particle, joins in the raw materials for sintering as one of raw materials for sintering, and in the sintered material flow process, accomplish mixing granulation with raw materials for sintering; The raw materials for sintering of the corresponding adjustment of described composition, the adjustment of its composition be according to the calcium oxide content in the calcification mud and carbon how much, the quicklime in the corresponding minimizing raw materials for sintering and the add-on of carbon.
The present invention after municipal sludge is disposed through the lime mummification, obtains the fine particle material after the super-dry pre-treatment, allocate into then and substitute part flux CaO and fuel in the raw materials for sintering, will prepare burden through after uniform mixing, the granulation preparation agglomerate then.
Compare with existing method for sludge treatment, aforesaid method has following advantage:
(1) the present invention has realized utilizing fast effectively of municipal sludge, has not only effectively disposed municipal sludge, and allocation ratio is high, has realized the resource in the municipal sludge and the recycling of the energy, greatly reduces the city processing cost of giving up admittedly; Control the secondary pollution problem in the sludge treatment, realized the harmless treatment and the recycling of mud;
Vertical sintering speed, yield rate and utilization coefficient when (2) allocating calcification mud into and can effectively improve the agglomerate sintering have improved the sintering character of agglomerate; Simultaneously can also reduce flux, the fuel input in the raw materials for sintering, reduce raw materials cost, achieve many things at one stroke;
(3) adding of lime calcification mud can substitute part flux CaO and fuel, has reduced the raw materials for sintering cost;
(4) municipal sludge that designs among the present invention is allocated raw materials for sintering utilization technology into; Can cumulative year after year, the municipal sludge problem that needs to be resolved hurrily be caused in the iron and steel metallurgical industry Production Flow Chart and handle; Realize the green metallurgical and the environment-friendly function of modernized iron and steel enterprise, thus the decrement and the high value added utilization of realization resource and energy recycling, solid waste.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
Embodiment 1
Calcification mud after the lime mummification disposal through natural air drying to water ratio 10%, is crushed to grain diameter 0.05～1mm with it then, joins in the raw materials for sintering, its quality (butt) is 2% of a raw materials for sintering total mass.Agglutinating test result shows: compare with not adding mud granule; After adding lime calcification mud, lime adding amount has reduced 0.8%, and sintering finished rate has increased 4.1%; The sintering utilization coefficient has increased 10.2%; Solid burnup has reduced 3.8kg/T, and sintering performance significantly improves, and the sintering cost significantly reduces.
Embodiment 2
Calcification mud after the lime mummification disposal is carried out granulation, and mud granulizing joins in the raw materials for sintering after natural air drying to water ratio 2% is crushed to grain diameter 0.05～1mm with it then, and its quality (butt) is 3% of a raw materials for sintering total mass.Agglutinating test result shows: compare with not adding mud granule; After adding lime calcification mud, lime adding amount has reduced 1.2%, and sintering finished rate has increased 5.0%; The sintering utilization coefficient has increased 13.0%; Solid burnup has reduced 0.6kg/T, and sintering performance significantly improves, and the sintering cost significantly reduces.
Embodiment 3
Calcification mud after the lime mummification disposal is carried out granulation, and mud granulizing is after natural air drying to water ratio 10% is crushed to grain diameter 0.05～3mm with it then; Join in the raw materials for sintering, its quality (butt) is 3.5% of a raw materials for sintering total mass, and agglutinating test result shows: compare with not adding mud granule; After adding lime calcification mud, lime adding amount has reduced 1.6%, and sintering finished rate has increased 1.5%;, the sintering utilization coefficient increased 2.0%; Solid burnup has reduced 0.3kg/T, and sintering performance increases, and the sintering cost significantly reduces.
Embodiment 4
Calcification mud after the lime mummification disposal is carried out granulation,, then it is crushed to grain diameter 0.05～1mm through natural air drying to water ratio 5%; Directly with addition of in the pellet sintering raw material, its quality (butt) is 1.5% of a raw materials for sintering total mass, carries out granulation as raw material; Granule size is 3～8mm, and the pellet sintering test-results shows: compare with not adding the mud material, behind the adding lime calcification mud; Lime adding amount has reduced 0.6%, and sintering finished rate has increased 2.1%,, the sintering utilization coefficient increased 2.5%; Solid burnup has reduced 0.2kg/T, and sintering performance increases, and the sintering cost significantly reduces.
Claims (3)
1. a municipal sludge is characterized in that as the method for utilizing of Iron And Steel Industry agglomerate raw material, and municipal sludge is mixed by municipal sludge 60～90wt%, unslaked lime 10～40wt% with the allocation ratio of unslaked lime; After drying, processed, obtain calcification mud; With calcification mud by a certain percentage and certain way, allocate among the raw materials for sintering of the corresponding adjustment of composition again, and get into sintering circuit with other raw materials for sintering and handle; Final production agglomerate product is as iron-smelting raw material;
Described municipal sludge and unslaked lime combination drying processed obtain lime calcification mud, calcification mud size range 0.05～3mm, water ratio scope 2～10wt%;
Said calcification mud allocation ratio accounts for 1.5～3.5wt% of raw materials for sintering total amount.
2. by the described method of claim 1; It is characterized in that: the mode that said calcification mud is allocated among the raw materials for sintering is after calcification mud is crushed to 0.05～3mm particle; Join in the raw materials for sintering as one of raw materials for sintering, and in the sintered material flow process, accomplish mixing granulation with raw materials for sintering.
3. by the described method of claim 1, it is characterized in that: the raw materials for sintering of the corresponding adjustment of said composition, its composition adjustment be according to the carbon in the calcification mud and calcium oxide content how much, the quicklime in the corresponding minimizing raw materials for sintering and the add-on of carbon.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102875004B (en) * | 2011-05-27 | 2014-02-12 | 赵向东 | Sludge treatment system |
| CN102964052A (en) * | 2012-10-22 | 2013-03-13 | 马鞍山钢铁股份有限公司 | Processing method of limestone washing sludge |
| CN104060092A (en) * | 2013-09-24 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Biochemical sludge processing method |
| CN103866119B (en) * | 2013-12-31 | 2016-01-20 | 首钢总公司 | For the additive for saving energy that sinters and application thereof |
| CN105271624B (en) * | 2014-05-29 | 2018-03-09 | 宝山钢铁股份有限公司 | A kind of method of cooperative disposal heavy metal sewage sludge |
| CN104278145B (en) * | 2014-10-15 | 2017-01-11 | 首钢总公司 | Method for producing sintering ore |
| CN106350661A (en) * | 2015-07-20 | 2017-01-25 | 中冶长天国际工程有限责任公司 | Iron ore sintering method and device without quicklime digester |
| CN105907952A (en) * | 2016-07-04 | 2016-08-31 | 湖南华菱湘潭钢铁有限公司 | Method of phenol hydrogen sludge participating in sintering ore blending |
| CN106191427A (en) * | 2016-08-09 | 2016-12-07 | 重庆大学 | A kind of municipal sludge mixes resource utilization method with useless fabric |
| CN108070723A (en) * | 2016-11-15 | 2018-05-25 | 中冶长天国际工程有限责任公司 | A kind of method of incineration of refuse flyash, municipal sludge and the metallurgy sintered recycling of Ferrous Metallurgy dedusting ash |
| CN108070714A (en) * | 2016-11-15 | 2018-05-25 | 中冶长天国际工程有限责任公司 | It is a kind of to utilize metallurgy sintered process sludge and the method for Ferrous Metallurgy dedusting ash |
| CN106590811B (en) * | 2016-11-22 | 2018-03-20 | 中冶节能环保有限责任公司 | A kind of method for substantially reducing sintering flue gas pellet and fine particle discharge |
| CN109055729B (en) * | 2018-09-21 | 2020-07-31 | 中国科学院城市环境研究所 | Method for resource utilization of sludge biochar |
| CN113801992B (en) * | 2020-06-17 | 2023-02-14 | 宝山钢铁股份有限公司 | Sintering digestion method of municipal sludge |
| CN113174482B (en) * | 2021-03-22 | 2022-10-04 | 中冶长天国际工程有限责任公司 | Process and device for cooperatively treating municipal sludge in iron ore sintering process |
| CN113981215B (en) * | 2021-09-23 | 2023-05-30 | 武汉钢铁有限公司 | Method for preparing sinter by taking municipal sludge and metallurgical dust as raw materials |
| CN114832448B (en) * | 2022-04-14 | 2023-03-24 | 柳州钢铁股份有限公司 | Treatment method for ammonia desulphurization solution sludge precipitation in steel industry |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH03207497A (en) * | 1990-01-10 | 1991-09-10 | Sumitomo Metal Ind Ltd | Treatment of sewerage sludge |
| CN1032869C (en) * | 1993-05-28 | 1996-09-25 | 首钢总公司 | Method and unit for utilizing and recovering mud produced by wet dust removal of converter |
| CN101717853B (en) * | 2009-12-16 | 2011-09-21 | 首钢总公司 | Method for preparing sintered mixture from municipal sludge and ferrous iron containing metallurgical dust |
| CN101805169A (en) * | 2010-04-22 | 2010-08-18 | 北京四方如钢混凝土制品有限公司 | Sludge treatment method and sintered sludge ceramsites produced by same |
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Effective date of registration: 20160801 Address after: 100041, Shougang District, Beijing, Shijingshan District (75) capital Steel Corp Administrative Building No. 4 floor Patentee after: SHOUGANG ENVIRONMENTAL INDUSTRY CO., LTD. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee before: Capital Iron & Steel General Company |