CN101435019A - Rotary hearth furnace raw material processing and pelletizing system process - Google Patents
Rotary hearth furnace raw material processing and pelletizing system process Download PDFInfo
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- CN101435019A CN101435019A CNA2008102339503A CN200810233950A CN101435019A CN 101435019 A CN101435019 A CN 101435019A CN A2008102339503 A CNA2008102339503 A CN A2008102339503A CN 200810233950 A CN200810233950 A CN 200810233950A CN 101435019 A CN101435019 A CN 101435019A
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Abstract
The invention discloses a technique of material handling and pelletizing system of a rotary hearth furnace. The technique comprises the following processes: dust containing zinc and sludge which needs to be processed can be delivered by a sealing tank truck and pipelines respectively; all kinds of dust removing ash containing iron and adhesives needed by pelletizing in the tank truck are directly delivered into a sealed batching bin; the sludge in the rotary furnace and gas sludge which are delivered by pipelines are processed and dried and then delivered into the batching bin for producing high-zinc iron-containing pellets which meet the requirements of high index parameters of an RHF furnace after passing through the processes of batching, grinding, humidifying, pelletizing and the like. The system production technique can overcome various adverse factors that the material ingredients of the dust containing zinc and the sludge have large fluctuation, the pelletizing performance is poor and the like, and has complete function, compact layout, clean environment and reasonable cost.
Description
Technical field
The present invention relates to the cycle of treatment recycling of steel industry high zinc containing iron mud, dust, particularly a kind of zinc-containing dust with the required processing of Steel Plant, mud are produced the technology that meets the high zinc containing iron pelletizing that the RHF furnace parameters requires.
Background technology
The used zinc overwhelming majority that contains the zinc raw material enters in iron dust containing and the mud in the steel manufacture process, and along with zinc-plated steel scrap consumption constantly increases, the useless admittedly zinc content of metallurgy is more and more higher.Because dust and mud iron content composition are higher, are a kind of renewable resource of preciousness.According to national resources utilization and Environment Protection Policy, also have circular economy concept, these iron dust containings and mud all should be handled the back recycle.But recycle need solve a zinc enrichment difficult problem, because will cause the not genial life-span of conditions of blast furnace to be reduced after the continuous enrichment of zinc.But domestic Steel Plant also do not have a cover all to carry out the holonomic system of system design and the production of input on-line industry from links such as raw material processing, reduction and waste gas, zinc powder recovery.The correlative study that has also rests on theory or experimental phase mostly, especially handle and make the ball system at the raw material of key and do not have that complete reliable technology of cover and equipment can overcome mud, this class raw material type of dust is numerous and diverse, the composition fluctuation is big, make unfavorable factors such as ball poor performance, and can stably produce the high zinc containing iron pelletizing that physical and chemical index satisfies the high temperature reduction condition with reasonable cost.
Japan have a cover with rotary hearth furnace (Rotary Heath Furnace (RHF)) be core be adapted to Iron And Steel Industry high zinc containing iron mud, the technology of dust industrial treatment and equipment, but this is subjected to the different working conditions of each factory to influence very big to handle and make the ball system at raw material, but the key link Japanese side that can decision RHF be suitable for ordinary production does not have a cover raw material subject range wide yet, and dry from mud, the material pneumatic seal is carried, dry method sealing accurate dosing, raw material ground and mixed humidification, make ball screening oven dry, defective material does not land this occupation of land unskilled labourer of the circular treatment compactness of planting continuously, complete raw material processing and the pellet forming process and the equipment of no secondary environmental pollution.
Summary of the invention
Practical situation in conjunction with each Steel Plant's high zinc containing iron mud, dust raw material, develop a cover and can overcome this class raw material composition fluctuation greatly, make many unfavorable factors such as ball poor performance and process function is perfect, batching accurately, compact in design, the cost reasonable raw material is handled and make the ball system process, finally can stably produce the high zinc containing iron pelletizing that satisfies RHF stove high target parameter request.Overcome simultaneously that Japanese existing rotary hearth furnace raw material is handled and made that the composition fluctuation of ball system is big, balling ratio is low, takes up an area of that big layout is disperseed, production link disperse discontinuous, secondary pollution serious, process function imperfection, the defective that involves great expense.
Ball system process process is handled and made to rotary hearth furnace raw material of the present invention is design like this:
1, the zinc-containing dust of required processing, mud can be come by closed tank truck and pipe-line transportation respectively.Various iron content dedusting ash in the tank car and make the required tackiness agent of ball, the batch bin that utilizes on-the-spot pressurized air and pipeline directly to send into sealing.Lower concentration converter mud and blast furnace gas mud that pipe-line transportation is come then are introduced into Sewage treatment systems, through handling moisture content is reduced, directly send into the special-purpose drying plant of high zinc containing iron mud by conveyor drive again, dried mud is sent into batch bin by the special-purpose pneumatic transport equipment of mud.
2, each batch bin end opening is prepared burden by mud special use and dust special batching equipment respectively.Control according to component contents such as TFe, Zn, SiO2 during batching, and can adjust according to the actual production variation.
3, the compound that finishes of batching is delivered to special-purpose grinding machine by conveyor drive and is ground.
4, the material after the grinding is handled by special-purpose mixing humidifier.
5, down several procedures be to send into by conveyor drive to be suitable for this class material and to make the special-purpose pelletizer of ball performance and make ball, screening, qualified green-ball advances the ball of green-ball dryer, oven dry and goes into the RHF stove.
6, the defective ball that screening, oven dry and RHF charging produce returns special-purpose grinding machine by conveyor drive, and the dust that dust-removal system is collected adopts the special-purpose pneumatic transport equipment of iron dust containing to send batch bin back to.
Native system can overcome zinc-containing dust, this class raw material composition fluctuation of mud is big, make many unfavorable factors such as ball poor performance, stably produce the high zinc containing iron pelletizing that satisfies RHF stove high target parameter request with reasonable cost, and process function is perfect, compact in design, environment is clean and tidy, specific equipment is reliable, cost is reasonable.
Description of drawings
Fig. 1 is that ball system process figure is handled and made to rotary hearth furnace raw material of the present invention.
Embodiment
The total packet form of adopting process and equipment integral is implemented.The zinc-containing dust of the required processing of facility, mud are come by closed tank truck and pipe-line transportation respectively.Sintering in the tank car, blast furnace, converter dust-removing ash and make the required tackiness agent of ball (wilkinite), the batch bin that utilizes on-the-spot pressurized air and pipeline directly to send into sealing.Lower concentration converter mud and blast furnace gas mud that pipe-line transportation is come then are introduced into Sewage treatment systems, through dehydration moisture content is reduced to 35%, send into the special-purpose drying plant of high zinc containing iron mud by conveyor drive again, dry moisture content be reduced to back 6% below by OG mud gas mud strength special use dense phase pump with proportion γ ≦ 2.5t/m3, granularity Φ ≦ 20mm mud granule is sent into batch bin.The batch bin end opening is prepared burden by mud special use and dust special batching equipment respectively.Mainly consider component contents such as TFe, Zn, SiO2 during batching, also will take into account each kind raw material simultaneously and need treatment capacity.Carry out after the charge calculation so that definite (batching sees Table 1) of system capability will fully reserve the scope that can change the adjustment of preparing burden according to the actual production raw material simultaneously.The compound that batching finishes and the defective ball of back operation are all delivered to the special-purpose damp mill of high zinc containing iron mud dust by conveyor drive and are added wet lapping, and raw meal particle size-200 order is increased to 95%, and moisture content reaches 3～9%.Material behind the profit mill is handled by special-purpose mixing humidifier by the material after grinding, and makes that humidity of materials and composition are more even, and moisture content brings up to 10%.Several procedures are respectively to send into diameter of phi=7m by conveyor drive down again, the special-purpose pelletizer of the high zinc containing iron mud dust of Bian Gaokeda 1.1m is produced qualified ball, the screening of 3 segmentation roll screens of qualification rate 80% above diameter of phi 5～20mm, and qualified green-ball advances the ball of green-ball dryer, oven dry and goes into the RHF stove.The defective ball that screening, oven dry and RHF charging produce returns special-purpose damp mill by conveyor drive, and the iron dust containing that dust-removal system is collected adopts RHF stove dust to reclaim air conveying special-purpose ash-pit and sends batch bin back to.
Table 1 charge calculation table
Claims (6)
1, a kind of rotary hearth furnace raw material is handled and is made the ball system process, and its technological process is as follows:
(1), the zinc-containing dust of required processing, mud can come by closed tank truck and pipe-line transportation respectively, various iron content dedusting ash in the tank car and make the required tackiness agent of ball, the batch bin that utilizes on-the-spot pressurized air and pipeline directly to send into sealing; Lower concentration converter mud and blast furnace gas mud that pipe-line transportation is come then are introduced into Sewage treatment systems, through handling moisture content is reduced, directly send into the special-purpose drying plant of high zinc containing iron mud by conveyor drive again, dried mud is sent into batch bin by the special-purpose pneumatic transport equipment of mud;
(2), each batch bin end opening prepared burden by mud special use and dust special batching equipment respectively, according to the control of component contents such as TFe, Zn, SiO2, also can change and adjust during batching according to actual production;
(3), the compound that finishes of batching is delivered to special-purpose damp mill by conveyor drive and is ground;
(4), the material after the grinding is handled by special-purpose mixing humidifier;
(5), the material after grinding sends into special-purpose pelletizer by conveyor drive and makes ball, screening, qualified green-ball advances the ball of green-ball dryer, oven dry and goes into the RHF stove;
(6), the defective ball that produces of screening, oven dry and RHF charging returns special-purpose damp mill by conveyor drive, the dust that dust-removal system is collected adopts the special-purpose pneumatic transport equipment of iron dust containing to send batch bin back to.
2, the ball system process is handled and made to rotary hearth furnace raw material according to claim 1, it is characterized in that lower concentration converter mud and blast furnace gas mud that pipe-line transportation is come enter Sewage treatment systems, through dehydration moisture content is reduced to 35%, send into the special-purpose drying plant of high zinc containing iron mud by conveyor drive again, dry moisture content is reduced to below 6%, then by the special-purpose dense phase pump of OG mud gas mud strength with proportion γ ≦ 2.5t/m3, granularity Φ ≦ 20mm mud granule is sent into batch bin.
3, rotary hearth furnace raw material according to claim 1 is handled and is made the ball system process, mainly considers when it is characterized in that preparing burden to carry out charge calculation according to following charge calculation table by component contents such as TFe, Zn, SiO2:
4, the ball system process is handled and made to rotary hearth furnace raw material according to claim 1, the defective ball of the compound that finishes and back operation of it is characterized in that preparing burden is all delivered to the special-purpose damp mill of high zinc containing iron mud dust by conveyor drive and is added wet lapping, raw meal particle size is ground to-200 orders, and moisture content reaches 3～9%.
5, rotary hearth furnace raw material according to claim 1 is handled and is made the ball system process, and the material after it is characterized in that grinding is handled back moisture content by special-purpose mixing humidifier and brought up to 10%.
6, rotary hearth furnace raw material according to claim 1 is handled and is made the ball system process, it is characterized in that the diameter of phi 5～20mm of the ball that processed by the special-purpose pelletizer of high zinc containing iron mud dust.
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| CNA2008102339503A CN101435019A (en) | 2008-12-17 | 2008-12-17 | Rotary hearth furnace raw material processing and pelletizing system process |
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| CNA2008102339503A CN101435019A (en) | 2008-12-17 | 2008-12-17 | Rotary hearth furnace raw material processing and pelletizing system process |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101962717A (en) * | 2010-10-26 | 2011-02-02 | 马钢设计研究院有限责任公司 | Raw material treatment and pelletizing system process for rotary hearth furnace |
| CN102126243A (en) * | 2010-11-30 | 2011-07-20 | 南京梅山冶金发展有限公司 | Water pre-adding balling method and device in production of permanent magnetic ferrite pre-sintered material |
| CN102839281A (en) * | 2012-09-13 | 2012-12-26 | 莱芜钢铁集团有限公司 | Method of producing titanium-bearing metallic pellets used for protecting blast furnace with rotary hearth furnace through direct reduction |
| CN102994740A (en) * | 2012-10-31 | 2013-03-27 | 高金菊 | Method for preparing carbon-containing pellet for blast furnace |
| CN103846050A (en) * | 2012-11-28 | 2014-06-11 | 沈阳铝镁设计研究院有限公司 | Fly ash raw material pellet production apparatus |
| CN112280975A (en) * | 2020-11-04 | 2021-01-29 | 韶关市曲江盛大冶金渣环保科技开发有限公司 | Method and device for pressing powder balls under screen of rotary hearth furnace |
-
2008
- 2008-12-17 CN CNA2008102339503A patent/CN101435019A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101962717A (en) * | 2010-10-26 | 2011-02-02 | 马钢设计研究院有限责任公司 | Raw material treatment and pelletizing system process for rotary hearth furnace |
| CN102126243A (en) * | 2010-11-30 | 2011-07-20 | 南京梅山冶金发展有限公司 | Water pre-adding balling method and device in production of permanent magnetic ferrite pre-sintered material |
| CN102839281A (en) * | 2012-09-13 | 2012-12-26 | 莱芜钢铁集团有限公司 | Method of producing titanium-bearing metallic pellets used for protecting blast furnace with rotary hearth furnace through direct reduction |
| CN102839281B (en) * | 2012-09-13 | 2015-08-05 | 莱芜钢铁集团有限公司 | Rotary hearth furnace direct-reduction is utilized to produce the method for blast furnace protecting titaniferous metallized pellet |
| CN102994740A (en) * | 2012-10-31 | 2013-03-27 | 高金菊 | Method for preparing carbon-containing pellet for blast furnace |
| CN102994740B (en) * | 2012-10-31 | 2014-01-22 | 高金菊 | Method for preparing carbon-containing pellet for blast furnace |
| CN103846050A (en) * | 2012-11-28 | 2014-06-11 | 沈阳铝镁设计研究院有限公司 | Fly ash raw material pellet production apparatus |
| CN112280975A (en) * | 2020-11-04 | 2021-01-29 | 韶关市曲江盛大冶金渣环保科技开发有限公司 | Method and device for pressing powder balls under screen of rotary hearth furnace |
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Open date: 20090520 |