CN108793650A - A kind of processing method of steel rolling oily sludge - Google Patents

A kind of processing method of steel rolling oily sludge Download PDF

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Publication number
CN108793650A
CN108793650A CN201710283325.9A CN201710283325A CN108793650A CN 108793650 A CN108793650 A CN 108793650A CN 201710283325 A CN201710283325 A CN 201710283325A CN 108793650 A CN108793650 A CN 108793650A
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China
Prior art keywords
oily sludge
steel rolling
reacting
rotary kiln
rolling oily
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CN201710283325.9A
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CN108793650B (en
Inventor
王如意
李建
刘剑平
徐万仁
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/10Treatment of sludge; Devices therefor by pyrolysis
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10BDESTRUCTIVE DISTILLATION OF CARBONAGEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B53/00Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/16Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes

Abstract

A kind of processing method of steel rolling oily sludge first mixes steel rolling oily sludge addition calcium lime powder, and calcium lime powder adding proportion is 2.5~7.5% weight ratios in steel rolling oily sludge;It is then placed in reacting in rotary kiln device and carries out low temperature gasification deoiling treatment, wherein 300~500 DEG C of temperature, coefficient of excess air 0.2~0.8, reaction time are 10~30min;The combustible fumes that reacting in rotary kiln device discharges is entered into secondary combustion chamber burning again, the heat smoke of generation returns again to the external-heat heat source into reacting in rotary kiln device as reacting in rotary kiln device, and the steel rolling oily sludge residue after de-oiling is utilized as iron making and sintering raw material.The method of the present invention has the advantages of low energy consumption, pollutant emission is low, and Commercial cultivation is returned inside de-oiled residue iron and steel enterprise.

Description

A kind of processing method of steel rolling oily sludge
Technical field
The present invention relates to refuse processing method more particularly to a kind of processing methods of steel rolling oily sludge.
Background technology
At steel rolling oily sludge main source two:First, the direct cooling cycle waste water warp of the processes such as hot rolling, breaking down and slab After cyclone sediment processing, then the sludge through advection sedimentation processing generation;Second is that the water outlet after eddy flow and two step of advection precipitation passes through again Reuse after filter filtering, strip section cooling waste water refilter rear reuse after precipitation, and Filter Back Washing goes out at above-mentioned two The sludge that water sedimentation generates;Steel rolling oily sludge has the characteristics that oil-containing, aqueous and iron oxide, general moisture content 10~ 20%, oil content is 1~10%, total iron content 30~55%.The main processing method of disposal of steel rolling oily sludge has:
1) it fills, final disposal but the shortcomings that wasted there are land occupation and iron resource;
2) it burns, the shortcomings that oily (organic matter) removal effect is good, but that there are energy consumptions is higher, and discharge flue gas need to be handled;
3) low temperature distillation, can be with oil recovery and iron resource, but oil purification is more complex and cost is higher, suitable for high oily sludge Processing;
4) molten Ji extraction, can be with oil recovery and iron resource, but there are process flow length, solvent slops to use processing troublesome and molten again Agent safety problem;
5) Commercial cultivation is returned, predominantly cement kiln collaboration utilizes and returns Commercial cultivation inside iron and steel enterprise.
It is a preferable method that cement kiln collaboration, which utilizes, but there is the shortcomings that across factory transport, while also can be to cement kiln The processing addition burden of flue gas;Commercial cultivation is returned inside iron and steel enterprise, is mainly had:
1) return blast furnace, furnace roof, which adds, needs briquetting to pre-process, injection can cause injection pipe abrasion the problems such as;
2) wraparound stove needs briquetting to pre-process, and exists to oily sludge sulfur content and require;
3) coking is returned, needs desiccation to mix Coal pretreatment, and because iron content is high, STRENGTH ON COKE gas permeability and coke oven refractory brick have negatively Effect;
4) sintering is returned, oil can be volatized into flue collector flue gas in sintering process, and negative shadow is caused to the safety of electric precipitator It rings;
5) collaboration of metallurgical environmental protection facility is handled, and is such as handled, is lacked using the rotary hearth furnace of steel mill's processing ion dust mud contaning, shaft furnace collaboration Point can increase the burden of fume treatment;Sintering is returned from the point of view of reality, after de-oiling using being a preferable selection, is sintered in addition to containing Outside oil mass requires, there are looser requirement, sintering itself to be equipped with complete smoke gas treatment system to other compositions, without having to worry about Secondary pollution problem, sintered material is convenient, and the oil content for returning sintering general control oily sludge is less than 0.5%.
Invention content
The purpose of the present invention is to provide a kind of processing method of steel rolling oily sludge, have it is simple for process, easy to operate, At low cost, valuable resource is fully used.
In order to achieve the above objectives, the technical scheme is that,
A kind of processing method of steel rolling oily sludge first mixes steel rolling oily sludge addition calcium lime powder, steel rolling oil-containing Calcium lime powder adding proportion is 2.5~7.5% weight ratios in sludge;It is then placed in reacting in rotary kiln device and carries out low temperature gasification cracking Deoiling treatment, wherein 300~500 DEG C of temperature, coefficient of excess air 0.2~0.8, reaction time are 10~30min;It will return again The combustible fumes of rotary kiln reactor discharge enters secondary combustion chamber burning, and the heat smoke of generation is returned again into reacting in rotary kiln device As the external-heat heat source of reacting in rotary kiln device, the steel rolling oily sludge residue after de-oiling is utilized as iron making and sintering raw material.
Preferably, 350~450 DEG C of the temperature of the reacting in rotary kiln device low temperature gasification deoiling treatment.
Preferably, the flue-gas temperature control for being used for reactor external-heat heat source is 500 DEG C~750 DEG C.
Preferably, hot rolling oily sludge moisture content is less than 25%, and oil content is less than 10%.
Preferably, the mesh of the grain size of the calcium lime powder≤200.
In the methods of the invention,
The ratio that calcium lime powder is added in steel rolling oily sludge is 2.5~7.5%;On the one hand can be to reduce in oily sludge The content of free water, water suction exothermic reaction and alkaline environment have volatilization and cracking using oil content, while calcium lime powder addition has Contaminant restraining discharges and avoids the good effect of the viscous reacting in rotary kiln device inner wall of oily sludge;Excessive material, which is added, can cause to locate It manages load and increases cost increase.
Steel rolling oily sludge is 300~500 DEG C in reactor temperature control;It more than certain temperature just can guarantee waving for oil Gasification reaction in hair, cracking and reactor, oil can remove thoroughly after temperature reaches certain value, and temperature is high again to increase system fortune Row energy consumption.
Coefficient of excess air 0.2~0.8 when de-oiling in reactor is passed through a certain amount of air and can guarantee the anoxic in reacting A certain amount of CO and CH in cracking and gasification reaction and combustible gas4Gas lights waste heat in dual firing chamber and can be used for heat source, can also protect Card not will produce excessive tar, and coefficient of excess air is excessively high, and the heating power type pollutant generation such as meeting NO is significantly increased.
The reaction time control in reactor of steel rolling oily sludge is 10~30min, the evaporating of moisture in reactor, oil Volatilization and cracking, the gasification reaction of organic matter need certain time, just can guarantee de-oiling effect, reaction certain time de-oiling can be thorough It is meaningless to de-oiling to be further added by the time for bottom.
The heat smoke that the combustible fumes of reactor discharge generates after dual firing chamber lights, is used as in being covered into shell of reactor The flue-gas temperature control of reactor external-heat heat source is 500~750 DEG C;Flue-gas temperature just can guarantee heat exchange only in this section Temperature control is in the preferable reaction temperature that gasifies in post-reactor.
Preferably, the steel rolling oily sludge oil content is less than 10%, and one side oil content is excessively high, can increase at flue gas De-oiling effect under the burden and reduction economic technology parameter of reason, while the excessively high more suitably method that may be used of oil-containing recycles Oil.
Preferably, the steel rolling oily sludge moisture content is less than 25%, controls following steel rolling oily sludge and life herein Processing in reactor can be directly entered after lime mixing, pre-processed without drying, and moisture content is excessively high can be to main reaction of gasifying It adversely affects.
Compared with prior art, the present invention having the advantages that:
1. making full use of the heat releases such as the cracking of itself oil content of hot rolling oily sludge, combustible gas burning, low energy consumption for system processing, contains Under the premise of oil mass is certain, itself thermal balance may be implemented, be not necessarily to external heat source.
2. realizing discharge SO 2 from fume and nitrogen by de-oiling temperature, quick lime addition and dual firing chamber's ignition temperature control Oxide it is up to standard, be not necessarily to upper desulphurization denitration treatment facility.
3. compared with burning, because low energy consumption and is not necessarily to desulphurization denitration, operating cost is low.
4. the residue after de-oiling, total iron content is high, can return sintering production utilization, realizes total iron resource in iron and steel enterprise Return Commercial cultivation.
Description of the drawings
Fig. 1 is the schematic diagram of the embodiment of the present invention.
Specific implementation mode
With reference to embodiment and attached drawing, the present invention will be further described.
Referring to Fig. 1, the processing method of steel rolling oily sludge of the present invention, first by steel rolling oily sludge and calcium lime powder with certain Ratio mixing, the additive amount of calcium lime powder is depending on the aqueous of steel rolling oily sludge, oil content;It is delivered to reacting in rotary kiln device 1 kiln hood position, sludge is interior as kiln body is rolled in reacting in rotary kiln device 1, and under the action of external flue gas, sludge Internal moisture and oily substance is become combustible gas by thermal evaporation, cracking, and sludge is in external flue gas, oil content cracking heat release, iron oxygen The effects that changing heat release completes de-oiling and desiccation, and the residue discharge kiln body after de-oiling is recycled and returns sintering production utilization;From return The flue gas of rotary kiln reactor discharge enters the burning of secondary combustion chamber 2, removes the organic substance in flue gas, and discharge heat and form heat Flue gas is recycled into the casing of reacting in rotary kiln device 1, and heat source is provided for sludge in rotary kiln.
Embodiment 1
The oily sludge that one hot rolling circulating water treatment generates, oil content 7.4%, moisture content 18.1%, total iron contain 48.5% (butt) is measured, 5% calcium lime powder of 200 mesh will wherein be added, it is anti-by screw feeder feeding rotary kiln after mixing It answers in the kiln hood of device, controlling technological parameter in reacting in rotary kiln device is:When 400 DEG C of temperature, coefficient of excess air 0.5, reaction Between be 20min;CO mean concentrations are 2500ppm in the combustible gas of discharge, this combustible gas is lighted, and will obtain 580 DEG C of temperature Heat smoke back to reacting in rotary kiln device external jacket in be used as external-heat heat source, the flue gas after heat exchange enters subsequent processing heel row It puts;Residue total iron content 60.4%, CaO content 10.4%, total carbon content 2.4% after rotary kiln de-oiling, oil content and Moisture content is zero, returns sintering production utilization.
Embodiment 2
The oily sludge that one slab circulating water treatment generates, oil content 4.5%, moisture content 15.1%, total iron contain 51.6 (butts) are measured, 3.5% quick lime of 200 mesh will wherein be added, reacting in rotary kiln is sent by screw feeder after mixing In the kiln hood of device, controlling technological parameter in reacting in rotary kiln device is:360 DEG C of temperature, coefficient of excess air 0.4, reaction time For 15min;CO mean concentrations are 1358ppm in the combustible gas of discharge, this combustible gas is lighted, and will obtain the heat of 520 DEG C of temperature Flue gas back to reacting in rotary kiln device external jacket in be used as external-heat heat source, the flue gas after heat exchange enters subsequent processing heel row It puts;Residue total iron content 60.6%, CaO content 8.4%, total carbon content 2.1% after rotary kiln de-oiling, oil content and contain Water rate is zero, returns sintering production utilization.
Embodiment 3
The oily sludge that one breaking down circulating water treatment generates, oil content 9.9%, moisture content 22%, total iron content 7.5% quick lime will be wherein added in 47.6% (butt), be sent into the kiln hood of reacting in rotary kiln device after mixing by screw feeder Interior, controlling technological parameter in reacting in rotary kiln device is:450 DEG C of temperature, coefficient of excess air 0.7, reaction time 25min; CO mean concentrations are 2710ppm in the combustible gas of discharge, this combustible gas is lighted, and the heat smoke for obtaining 700 DEG C of temperature is returned To external-heat heat source is used as in the external jacket of reacting in rotary kiln device, the flue gas after heat exchange discharges after entering subsequent processing;Rotary kiln Residue total iron content 59.8%, CaO content 11.6%, total carbon content 2.3% after kiln tail de-oiling, oil content are less than 0.1%, contain Water rate is zero, returns sintering production utilization.

Claims (5)

1. a kind of processing method of steel rolling oily sludge, characterized in that first mix steel rolling oily sludge addition calcium lime powder, roll Calcium lime powder adding proportion is 2.5~7.5% weight ratios in steel oily sludge;It is then placed in reacting in rotary kiln device and carries out low temperature gas Change deoiling treatment, wherein 300~500 DEG C of temperature, coefficient of excess air 0.2~0.8, reaction time are 10~30min;Again will The combustible fumes of reacting in rotary kiln device discharge enters secondary combustion chamber burning, and the heat smoke of generation is returned again into reacting in rotary kiln External-heat heat source of the device as reacting in rotary kiln device, the steel rolling oily sludge residue after de-oiling are utilized as iron making and sintering raw material.
2. the processing method of steel rolling oily sludge as described in claim 1, characterized in that the reacting in rotary kiln device low temperature gas Change 350~450 DEG C of the temperature of deoiling treatment.
3. the processing method of steel rolling oily sludge as described in claim 1, characterized in that for reactor external-heat heat source The control of heat smoke temperature is 500 DEG C~750 DEG C.
4. the processing method of steel rolling oily sludge as described in claim 1, characterized in that hot rolling oily sludge moisture content is less than 25%, oil content is less than 10%.
5. the processing method of steel rolling oily sludge as described in claim 1, feature sign is, the grain size of the calcium lime powder≤ 200 mesh.
CN201710283325.9A 2017-04-26 2017-04-26 Treatment method of steel rolling oily sludge Active CN108793650B (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0401811A1 (en) * 1989-06-08 1990-12-12 Nukem GmbH Apparatus for the thermal treatment of organic and inorganic materials
CN1246449A (en) * 1998-09-01 2000-03-08 姜启文 Intermittent treating equipment of floater and oily sludge
CN102936087A (en) * 2012-11-06 2013-02-20 大连海事大学 Method for preparing pyrolysis oil and synthesis gases by pyrolysis of sludge
CN104876414A (en) * 2015-06-09 2015-09-02 湖州宜可欧环保科技有限公司 Method and device for pyrolytic carbonizing treatment of sludge
CN105601075A (en) * 2016-03-25 2016-05-25 刘晓静 Sludge pyrolysis carbonization technique and device
WO2016166413A1 (en) * 2015-04-17 2016-10-20 Valmet Technologies Oy Catalytic upgrading of pyrolytic vapors
CN106493148A (en) * 2016-10-21 2017-03-15 上海蓝州环保科技有限公司 A kind of solid organic castoff gasification and melting circulating disposal process

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0401811A1 (en) * 1989-06-08 1990-12-12 Nukem GmbH Apparatus for the thermal treatment of organic and inorganic materials
CN1246449A (en) * 1998-09-01 2000-03-08 姜启文 Intermittent treating equipment of floater and oily sludge
CN102936087A (en) * 2012-11-06 2013-02-20 大连海事大学 Method for preparing pyrolysis oil and synthesis gases by pyrolysis of sludge
WO2016166413A1 (en) * 2015-04-17 2016-10-20 Valmet Technologies Oy Catalytic upgrading of pyrolytic vapors
CN104876414A (en) * 2015-06-09 2015-09-02 湖州宜可欧环保科技有限公司 Method and device for pyrolytic carbonizing treatment of sludge
CN105601075A (en) * 2016-03-25 2016-05-25 刘晓静 Sludge pyrolysis carbonization technique and device
CN106493148A (en) * 2016-10-21 2017-03-15 上海蓝州环保科技有限公司 A kind of solid organic castoff gasification and melting circulating disposal process

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