CN104230190A - Method for treating arsenical sludge by utilizing rotary cement kiln - Google Patents
Method for treating arsenical sludge by utilizing rotary cement kiln Download PDFInfo
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- CN104230190A CN104230190A CN201410478496.3A CN201410478496A CN104230190A CN 104230190 A CN104230190 A CN 104230190A CN 201410478496 A CN201410478496 A CN 201410478496A CN 104230190 A CN104230190 A CN 104230190A
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- cement
- containing arsenic
- rotary kiln
- sludge
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
- Y02P40/121—Energy efficiency measures, e.g. improving or optimising the production methods
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- Curing Cements, Concrete, And Artificial Stone (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method for treating arsenical sludge by utilizing a rotary cement kiln. According to the method, cooling hot air produced during clinker cooling by a grate cooler of dry process cement production equipment and high-temperature kiln tail gas of the rotary kiln are introduced into a dryer to dry wet sludge, and drying tail gas is exhausted from a chimney after dust removal; and the dried sludge with certain water content is fed into the rotary cement kiln and subjected to co-firing with a cement raw material, arsenic in the arsenical sludge and the cement raw material CaO form calcium arsenate in the high-temperature co-firing process, arsenic curing and stabilizing purposes are achieved, and the arsenical sludge is safely and reasonably treated. According to the method, heat produced during cement production can be sufficiently utilized to dry the wet sludge, energy loss is reduced, and the benefit is improved.
Description
Technical field
The invention belongs to comprehensive utilization of resources and environmental protection technical field, be specifically related to a kind of method utilizing cement rotary kiln process dreg containing arsenic.
Background technology
Along with the development of economic society, the generation of heavy metal waste source also becomes complicated and extensively, as chemical make, the industry such as the production of industrial chemicals.Danger wastes generally will use professional incinerator to process, but the centralized burning of Hazardous wastes can produce incineration residue and dust, and these lime-ash and dust usually containing heavy metal substances such as cadmium, manganese, lead and chromium, and become secondary danger wastes.Need to send into landfill yard and carry out landfill disposal, the hazardous material percolate after preventing landfill that needs of security landfill most critical permeates the ground, and the waste water especially produced in hazard waste landfill process, containing arsenic, easily pollutes surface water, underground water and soil.Once polluted underground water, consequence very serious; And strict risk assessment must be carried out in landfill place.In recent years, cement rotary kiln multifuel combustion Hazardous wastes produces eco-cement technology, because it has that secondary pollution is few, harmless treatment is more thorough and the feature such as good in economic efficiency and be subject to extensive concern gradually.
Arsenic (As) is a kind of poisonous carcinogenic substance, has " three cause " effect.Therefore, the environmental significance studying arsenic Pollution abatement is very great.
The coexistence of solid waste cement kiln is put to refer to and use refuse in the production process of cement, comes alternative primary fuel and raw material, regenerated energy and material from refuse by refuse.The management that the coexistence of solid waste cement kiln is set to Cement industry and refuse provides better selection mode.For Cement industry, can fuel saving and raw material, contribute to carrying out cost-effective production; For waste management, this waste reclaimation mode, need not set up special trash burner or waste reclamation place, save the input of land resources and fund.This waste treatment mode is optimized from angle that is ecological, social and that save waste management, is the ideal chose of waste treatment mode.
According to the production technique of Cement industry and the requirement of equipment, cement kiln disposal of wastes is utilized to have following characteristics:
(1) incineration temperature is high.In cement kiln, temperature of charge is generally higher than 1450 DEG C, and gas temperature, then higher than 1750 DEG C, even can reach higher temperature.At these elevated temperatures, in refuse, organism will decompose thoroughly, and clearance is generally more than 99.99%.
(2) residence time is long.Refuse stops for a long time under the cement kiln condition of high temperature, is conducive to the thorough burning Sum decomposition of refuse.
(3) good turbulent flow.In cement kiln, high-temperature gas is contrary with Flow of Goods and Materials direction, and turbulent flow is strong, be conducive to that gas-solid must mix mutually, conducts heat, caloic, decomposition, chemical combination, diffusion.
(4) environment of alkalescence.Alkaline matter in cement kiln can in and refuse in acidic substance be stable salt (as neutralized highly acid HCl class flue gas), be applicable to very much the various organic waste of process, what particularly stability was strong contains HCl organism, the discharge of effective suppression acidic substance, is convenient to the purification of tail gas.
(5) waste residue is not had to discharge.In the technological process of manufacture of cement, only have raw material and through who grog that calcining process produces, do not have general incinerator to burn the problem producing slag.
(6) curing heavy metal ion.Utilize Cement industry to turn round cellar for storing things kiln calcining process process Hazardous wastes, can the most heavy metal ion in waste component are solidificated in grog, finally enter in finished cement, avoid and spread once again.
(7) social total discharge amount of exhaust gas is reduced.Due to combustible waste substituting mineral substance fuel, decrease the requirement of Cement industry to mineral substance fuel (coal, gas, heavy oil etc.).In general, than the waste gas (CO that independent manufacture of cement and incinerating waste material produce
2, SO
2, Cl etc.) quantity discharged greatly reduces.
(8) incineration disposal point is many, strong adaptability.
(9) off gas treatment is effective.Cement industry firing system and flare system, waste gas after making burning is through longer path and good cooling and dust collection device, have higher absorption, sedimentation and the effect of gathering dust, the dust of collection returns stock preparation system through delivery system and can re-use.
(10) construction investment is less, and running cost is lower.Utilize cement rotary kiln cellar for storing things disposal of wastes, although need to transform necessarily in processing unit and feed facility, and need newly-built waste storage and pre-treatment facility, compare with newly-built special incineration plant, still greatly save investment.In running cost, although due to the depreciation of equipment, electric power and raw-material consumption, labour cost etc. make expense increase, and burn combustible refuse is wanted can fuel saving, and reduce fuel cost, replacement of fuel ratio is higher, and economic benefit is more obvious.
Summary of the invention
For solving the shortcoming and defect part of prior art, the object of the present invention is to provide a kind of method utilizing cement rotary kiln process dreg containing arsenic.
For achieving the above object, the present invention adopts following technical scheme:
Utilize a method for cement rotary kiln process dreg containing arsenic, comprise the following steps:
From grate-cooler and rotary kiln extracting gases, after fly-ash separator process, gas is sent in dryer and dries dreg containing arsenic;
Dreg containing arsenic is put into sludge storage warehousing, dreg containing arsenic in sludge storage warehousing is sent into drying machine drying uniformly, thick to control the dewatered sludge water ratio after drying be 25-35% (weight), obtains dewatered sludge that water ratio is 25-35% (weight) and sent into dewatered sludge storage vault;
According to the ratio that production 1 ton of cement clinker admixture 0.025-0.035 ton water ratio is the dewatered sludge of 25-35% (weight), by the water ratio in dewatered sludge storage vault be 25-35% (weight) dewatered sludge decomposition kiln or rotary kiln send into uniformly in rotary kiln, at 1450 DEG C, burn reaction together with cement slurry, generate cement clinker.
In above-mentioned burning reaction, dewatered sludge provides certain heat for cement burns till, and after burning reaction, arsenic element is cemented in grog lattice.
Preferably, the gas temperature extracted from grate-cooler is 250-450 DEG C.
Preferably, the gas temperature extracted from kiln tail is 280-350 DEG C.
Preferably, described dreg containing arsenic water content is 80% (weight); After dreg containing arsenic being put into sludge storage warehousing, mix according to production 1 ton of cement clinker and burn the ratio that 0.07-0.13 ton water content is the dreg containing arsenic of 80% (weight), dreg containing arsenic is sent into drying machine drying uniformly.
Preferably, the gas of described dryer discharge enters air from smoke stack emission after dust-precipitator.
Preferably, described cement slurry enters together with dewatered sludge that rotary kiln and water ratio be 25-35% (weight) again and burns reaction after preheater preheats.
Preferably, also add the dewatered sludge that coal dust and water ratio are 25-35% (weight) and burn reaction together with cement slurry.
The present invention produces cooling hot blast and rotary kiln high temperature kiln tail gas when utilizing cement produced with the dry method production unit grate-cooler to cool grog passes into the object that dryer reaches the wet mud of oven dry, dries tail gas after dedusting from smoke stack emission; The mud of drying certain water ratio is sent in cement rotary kiln and cement slurry multifuel combustion, in high temperature During Co-firing, arsenic in dreg containing arsenic and cement raw material CaO form Tricalcium arsenate, reach the object of solidification and stabilization arsenic, thus carry out safety to dreg containing arsenic and reasonably dispose.
Compared with prior art, the present invention has the following advantages and beneficial effect:
Warm air after the present invention utilizes clinker cooling and high temperature kiln tail gas carry out dewatered sludge, afterwards water generation reaction mud grog together with cement raw material by a certain percentage, and do not affect the quality of cement products.
Cooling grog with grate-cooler in New Type Dry-process Cement Production, is enter using natural air as cooling gas; Cooled gas temperature is in (350 ± 100) DEG C, and the gas temperature of kiln tail collection is simultaneously also at 280-350 DEG C, and the present invention can make full use of the heat produced in manufacture of cement and carry out mummification to wet mud, reduces the consumption of energy, increases the benefit.
Accompanying drawing explanation
Fig. 1 is a kind of schema utilizing the method for cement rotary kiln process dreg containing arsenic of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
The invention provides a kind of method utilizing cement rotary kiln process dreg containing arsenic, comprise the following steps:
From grate-cooler and rotary kiln extracting gases, after fly-ash separator process, gas is sent in dryer and dries dreg containing arsenic;
Dreg containing arsenic is put into sludge storage warehousing, dreg containing arsenic in sludge storage warehousing is sent into drying machine drying uniformly, thick to control the dewatered sludge water ratio after drying be 25-35% (weight), obtains dewatered sludge that water ratio is 25-35% (weight) and sent into dewatered sludge storage vault;
According to the ratio that production 1 ton of cement clinker admixture 0.025-0.035 ton water ratio is the dewatered sludge of 25-35% (weight), by the water ratio in dewatered sludge storage vault be 25-35% (weight) dewatered sludge decomposition kiln or rotary kiln send into uniformly in rotary kiln, at 1450 DEG C, burn reaction together with cement slurry, generate cement clinker.
In above-mentioned burning reaction, dewatered sludge provides certain heat for cement burns till, and after burning reaction, arsenic element is cemented in grog lattice.
Statistic data shows, during mud is dried, along with the reduction of water ratio, the heated drying characteristic of mud is also become better and better, proterties improves, but, when moisture percentage in sewage sludge is too low, mud combustiblecomponents loss, and in mud the effusion of objectionable impurities Cheng with Sheng dioxin highly toxic substance and operating temperature all closely related.And moisture percentage in sewage sludge is lower, consume energy larger, synthesise various is considered, the present invention controls the moisture percentage in sewage sludge after drying 30 ± 5%.Go out the gas of dryer, after the purifications such as fly-ash separator, enter in air through chimney.
Preferably, the gas temperature extracted from grate-cooler is 250-450 DEG C.
Preferably, the gas temperature extracted from kiln tail is 280-350 DEG C.
Preferably, described dreg containing arsenic water content is 80% (weight); After dreg containing arsenic being put into sludge storage warehousing, mix according to production 1 ton of cement clinker and burn the ratio that 0.07-0.13 ton water content is the dreg containing arsenic of 80% (weight), dreg containing arsenic is sent into drying machine drying uniformly.
Preferably, the gas of described dryer discharge enters air from smoke stack emission after dust-precipitator.
Preferably, described cement slurry enters together with dewatered sludge that rotary kiln and water ratio be 25-35% (weight) again and burns reaction after preheater preheats.
Preferably, also add the dewatered sludge that coal dust and water ratio are 25-35% (weight) and burn reaction together with cement slurry.
Mud feeding mouth decomposes the temperature of kiln or rotary kiln all more than 900 DEG C, here cement slurry reaction decomposes can go out a large amount of calcium oxide, arsenic at high temperature in matter containing arsenic can be consolidated arsenical with CaO etc. and react, generate high temperature resistant, nonvolatile stable compound, show through the research of Extended X-ray Absorption Fine Structure spectrum, that reaction generates is Tricalcium arsenate EXAFS.Tricalcium arsenate is at high temperature highly stable, and not easily decomposes.When dewatered sludge adds fashionable, combustiblesubstance wherein burns rapidly and provides heat for cement burns till, and the sour gas of production, by alkaline matter and absorb, again enters in desiccation machine with kiln tail gas and dries wet mud; Lime-ash after sludge incineration enters in rotary kiln together with cement slurry, and reaction sintering forms cement clinker at the temperature of 1450 DEG C.The objectionable constituent such as mud Zhong dioxin are at high temperature all decomposed, and arsenic is wrapped in the lattice of cement clinker.Sludge incineration provides the certain heat of cement kiln, both decreases energy input like this in sludge disposal process, has processed again mud.
Embodiment 1
Utilize a method for cement rotary kiln process dreg containing arsenic, as shown in Figure 1, comprise the following steps:
From grate-cooler and rotary kiln extracting gases, after fly-ash separator process, gas is sent in dryer and dries dreg containing arsenic;
The dreg containing arsenic shipped from sewage work is put into sludge storage warehousing, mix according to production 1 ton of cement clinker and burn the ratio that 0.07-0.13 ton water content is 80% (weight) dreg containing arsenic, dreg containing arsenic is sent into drying machine drying uniformly, and the dewatered sludge water ratio after thick control oven dry is 25-35% (weight); Dryer discharge gas gather dust through dust-precipitator, purify after enter air from smoke stack emission, the water ratio obtained is that the dewatered sludge of 25-35% (weight) enters dewatered sludge storage vault;
According to the ratio that production 1 ton of grog admixture 0.025-0.035 ton water ratio is the dewatered sludge of 25-35% (weight), by water ratio be 25-35% (weight) dewatered sludge decomposition kiln or rotary kiln send into uniformly in rotary kiln, burn at 1450 DEG C together with coal dust, cement slurry after preheater preheats and react, dewatered sludge provides certain heat for cement burns till, mud reacts with raw material in rotary kiln, arsenic element is cemented in grog lattice, generates cement clinker.
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from spirit of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (7)
1. utilize a method for cement rotary kiln process dreg containing arsenic, it is characterized in that, comprise the following steps:
From grate-cooler and rotary kiln extracting gases, after fly-ash separator process, gas is sent in dryer and dries dreg containing arsenic;
Dreg containing arsenic is put into sludge storage warehousing, dreg containing arsenic in sludge storage warehousing is sent into drying machine drying uniformly, thick to control the dewatered sludge water ratio after drying be 25-35% (weight), obtains dewatered sludge that water ratio is 25-35% (weight) and sent into dewatered sludge storage vault;
According to the ratio that production 1 ton of cement clinker admixture 0.025-0.035 ton water ratio is the dewatered sludge of 25-35% (weight), by the water ratio in dewatered sludge storage vault be 25-35% (weight) dewatered sludge decomposition kiln or rotary kiln send into uniformly in rotary kiln, at 1450 DEG C, burn reaction together with cement slurry, generate cement clinker.
2. the method utilizing cement rotary kiln process dreg containing arsenic according to claim 1, is characterized in that, the gas temperature extracted from grate-cooler is 250-450 DEG C.
3. the method utilizing cement rotary kiln process dreg containing arsenic according to claim 1, is characterized in that, the gas temperature extracted from kiln tail is 280-350 DEG C.
4. the method utilizing cement rotary kiln process dreg containing arsenic according to claim 1, is characterized in that, described dreg containing arsenic water content is 80% (weight); After dreg containing arsenic being put into sludge storage warehousing, mixing according to production 1 ton of cement clinker and burn the ratio that 0.07-0.13 ton water content is the dreg containing arsenic of 80% (weight), is that the dreg containing arsenic of 80% (weight) sends into drying machine drying uniformly by water content.
5. the method utilizing cement rotary kiln process dreg containing arsenic according to claim 1, is characterized in that, the gas of described dryer discharge enters air from smoke stack emission after dust-precipitator.
6. the method utilizing cement rotary kiln process dreg containing arsenic according to claim 1, is characterized in that, described cement slurry enters together with dewatered sludge that rotary kiln and water ratio be 25-35% (weight) again and burns reaction after preheater preheats.
7. the method utilizing cement rotary kiln process dreg containing arsenic according to claim 1, is characterized in that, also adds the dewatered sludge that coal dust and water ratio are 25-35% (weight) and burn reaction together with cement slurry.
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| CN201410478496.3A CN104230190A (en) | 2014-09-18 | 2014-09-18 | Method for treating arsenical sludge by utilizing rotary cement kiln |
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| CN201410478496.3A CN104230190A (en) | 2014-09-18 | 2014-09-18 | Method for treating arsenical sludge by utilizing rotary cement kiln |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104807017A (en) * | 2015-05-08 | 2015-07-29 | 北京水泥厂有限责任公司 | System for treating industrial waste in combination with thermal desorption and use method |
| CN106082728A (en) * | 2016-06-17 | 2016-11-09 | 同济大学 | A kind of method reducing the discharge of cement kiln synergic processing municipal sludge process amounts of sulphur contaminants |
| CN108545971A (en) * | 2018-06-22 | 2018-09-18 | 云南创拓环境科技有限公司 | A kind of clinker and preparation method thereof |
| CN109990609A (en) * | 2019-03-25 | 2019-07-09 | 浙江红狮环保股份有限公司 | A kind of cement kiln tube body waste heat desiccation solid waste technique |
| CN113061019A (en) * | 2021-04-16 | 2021-07-02 | 山西太钢工程技术有限公司 | Method for preparing shaped brick from chromic acid-containing mud through low-temperature drying modification of rotary kiln |
| CN113636731A (en) * | 2021-09-09 | 2021-11-12 | 南京青橄榄环境工程有限公司 | Method for efficiently utilizing intermediate state substances in cement production to dry and dispose sludge |
| CN115432904A (en) * | 2022-08-09 | 2022-12-06 | 合肥水泥研究设计院有限公司 | Device for drying sludge by using low-temperature waste gas at tail of cement kiln |
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| CN101143764A (en) * | 2007-08-27 | 2008-03-19 | 上海联合水泥有限公司 | Cement clinker prepared from dehydrated sludge burdening and preparation method thereof |
| CN102173553A (en) * | 2011-01-07 | 2011-09-07 | 袁文献 | Method for drying and processing sludge by use of cement production waste gas |
| CN103755169A (en) * | 2013-12-27 | 2014-04-30 | 云南省环境科学研究院(中国昆明高原湖泊国际研究中心) | Method for treating arsenic-containing waste residues by using cement rotary kiln |
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| CN101143764A (en) * | 2007-08-27 | 2008-03-19 | 上海联合水泥有限公司 | Cement clinker prepared from dehydrated sludge burdening and preparation method thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104807017A (en) * | 2015-05-08 | 2015-07-29 | 北京水泥厂有限责任公司 | System for treating industrial waste in combination with thermal desorption and use method |
| CN106082728A (en) * | 2016-06-17 | 2016-11-09 | 同济大学 | A kind of method reducing the discharge of cement kiln synergic processing municipal sludge process amounts of sulphur contaminants |
| CN106082728B (en) * | 2016-06-17 | 2018-08-24 | 同济大学 | A method of reducing the discharge of cement kiln synergic processing municipal sludge process amounts of sulphur contaminants |
| CN108545971A (en) * | 2018-06-22 | 2018-09-18 | 云南创拓环境科技有限公司 | A kind of clinker and preparation method thereof |
| CN109990609A (en) * | 2019-03-25 | 2019-07-09 | 浙江红狮环保股份有限公司 | A kind of cement kiln tube body waste heat desiccation solid waste technique |
| CN113061019A (en) * | 2021-04-16 | 2021-07-02 | 山西太钢工程技术有限公司 | Method for preparing shaped brick from chromic acid-containing mud through low-temperature drying modification of rotary kiln |
| CN113636731A (en) * | 2021-09-09 | 2021-11-12 | 南京青橄榄环境工程有限公司 | Method for efficiently utilizing intermediate state substances in cement production to dry and dispose sludge |
| CN115432904A (en) * | 2022-08-09 | 2022-12-06 | 合肥水泥研究设计院有限公司 | Device for drying sludge by using low-temperature waste gas at tail of cement kiln |
| CN115432904B (en) * | 2022-08-09 | 2024-05-14 | 合肥水泥研究设计院有限公司 | Device for drying sludge by using cement kiln tail low-temperature waste gas |
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Application publication date: 20141224 |