CN103952540B - Ion dust mud contaning and high silicon iron concentrate is utilized to produce the technique of prereduced burden - Google Patents
Ion dust mud contaning and high silicon iron concentrate is utilized to produce the technique of prereduced burden Download PDFInfo
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- CN103952540B CN103952540B CN201410110177.7A CN201410110177A CN103952540B CN 103952540 B CN103952540 B CN 103952540B CN 201410110177 A CN201410110177 A CN 201410110177A CN 103952540 B CN103952540 B CN 103952540B
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Abstract
The present invention utilizes ion dust mud contaning and high silicon iron concentrate to produce the technique of prereduced burden, blast furnace gas plaster, converter OG sludge, high silicon iron concentrate and wilkinite are mixed by the weight ratio of 100:20 ~ 30:60 ~ 70:2 ~ 3, the moisture content of described blast furnace gas plaster is less than 8%; Mixture obtains raw briquetting through profit mill, briquetting, drying; Briquetting will be given birth to send in tunnel furnace, and carry out preheating and reducing roasting, obtain prereduced burden.Technique of the present invention is according to the composition rational proportion of each raw material, and the components such as the ferriferous oxide in ion dust mud contaning, carbon, calcium oxide are reasonably utilized, and product iron grade is more than 55%, and degree of metalization is more than 85%.Its technique is simple, and treatment capacity is large, resource recycling is abundant and pollute little.
Description
Technical field
The invention belongs to field of steel metallurgy, be specifically related to a kind of with ion dust mud contaning and high silicon iron concentrate for raw material, utilize tunnel kiln reduction to produce the technique of prereduced burden.
Background technology
China is Iron and Steel Production big country, has occupied world's umber one since iron and steel output to 1996 year always, but huge turnout result also in the minimizing of domestic iron resources.Blast furnace gas plaster and converter OG sludge are all the products of flue-gas wet dust removal in steelmaking process, are ion dust mud contaning, and iron-holder is high, are can the resource of second stage employ.
In steel manufacture process, have a large amount of blast furnace gas plaster and converter OG sludge to produce, its total amount has accounted for 4 ~ 7% of enterprise's output of steel.Blast furnace gas plaster, mainly containing the beneficial element such as iron and carbon, also contains a small amount of harmful element such as zinc, lead simultaneously.At present, blast furnace gas plaster, converter OG sludge etc. sinter as raw materials for sintering by most domestic iron and steel enterprise, although this method achieves the recycling of resource, but allocate into dirt mud in raw materials for sintering due to its granularity thinner, the ventilation property of sinter bed and the intensity of agglomerate can be affected, the Volatile Elements such as Zn, Pb of simultaneously containing in dirt mud, also can at blast furnace circulating enrichment, Zn content in blast furnace gas is caused constantly to rise and in upper blast furnace dross, cause blast furnace gas pipeline to block, affect the normal operation of blast furnace.
For making iron-containing waste obtain Appropriate application, domestic iron and steel enterprises is done a lot of work in iron containing sludge, the utilizing of dust the like waste nearly ten years.(1) higher according to CaO and FeO content in steel making dust slime feature, steel making dust slime is pressed into cooled agglomerated pellet, add in STEELMAKING PRODUCTION and carry out second stage employ, although this method make use of ferriferous oxide in steel making dust slime and calcium oxide preferably, but due to limited to the also commercial weight of ferriferous oxide in steelmaking process, can only add on a small quantity in smelting, simultaneously the cooled agglomerated pellet balling property prepared of this method and high temperature metallurgical properties poor, easy efflorescence, is not beneficially used alone; (2) blast furnace gas plaster is due to containing harmful elements such as a certain amount of Zn, Pb, after employing rotary hearth furnace carries out de-Zn, Pb, recycle the carbon and ferriferous oxide that wherein contain, but because its carbon content is higher, its intensity of direct briquetting is lower, and briquetting is easily broken in reducing roasting, though by making carbonaceous pelletizing with addition of a certain amount of iron scale, and make it at high temperature reduce, but there is the phenomenon that energy consumption is large and reduction temperature is high.
The recycling of zinc element in ion dust mud contaning to ion dust mud contaning has considerable influence, generally selects ion dust mud contaning is carried out dezincify and reclaims zinc.At present, ion dust mud contaning pyrogenic process dezincify technology mainly contains shaft furnace process, rotary hearth furnace process, rotary kiln technology.In shaft furnace process, product is molten iron, and byproduct is coal gas, slag, zinc-containing sludge, and the physical property requirements of this technique to raw material is high, and dust mud etc. needs briquetting.Rotary hearth furnace process can dispose various iron dust containing, and processing efficiency is higher, and can reclaim the metal such as iron, zinc, lead in Zinc-Bearing Wastes well.But there is the shortcoming that fire box temperature is higher, the bed of material is thinner, efficiency of energy utilization is not high and apparatus and process is complicated.Rotary kiln technology is relatively simple, and process Dust Capacity is large, and resource recycling is abundant, and environmental pollution is little, and can solve the problem of zinc enrichment in blast furnace gas plaster, but also there is the problem of easily ring formation in rotary kiln.
High silicon refractory iron ore adopts conventional ore grinding and magnetic separation process, can obtain the high silicon iron fine powder that grade is higher, but due to SiO in high silicon iron fine powder
2content is higher, directly adds blast furnace and uses, and can produce the larger quantity of slag and higher coke ratio, brings certain difficulty to the smelting of blast furnace simultaneously.But when high silicon iron concentrate is processed by direct-reduction technique, when adopting the conventional direct reduction process such as rotary hearth furnace to utilize, its production cost is higher, resource utilization is low, and direct-reduction product silicone content is higher simultaneously, and it is very uneconomical that steel-making furnace charge is made in direct supply converter.
Summary of the invention
The present invention overcomes deficiency of the prior art, provides a kind of ion dust mud contaning and high silicon iron concentrate tunnel kiln reducing process, thus obtains reasonable ratio, prereduced burden that intensity is high.
The present invention utilizes ion dust mud contaning and high silicon iron concentrate to produce the technique of prereduced burden, comprises the following steps:
(1) give birth to the preparation of briquetting: blast furnace gas plaster, converter OG sludge, high silicon iron concentrate and wilkinite are uniformly mixed, mixture obtains raw briquetting through profit mill, briquetting, drying; Described blast furnace gas plaster, converter OG sludge, high silicon iron concentrate and bentonitic weight ratio are 100:20 ~ 30:60 ~ 70:2 ~ 3.
The moisture content of blast furnace gas plaster is preferably less than 8%; Mixture carry out profit mill and briquetting time, briquetting size control in 53 × 53 × 115mm ~ 53 × 230 × 230mm, the moisture content of briquetting controls 5 ~ 7%; Dry processing parameter is: drying temperature is 100 ~ 250 DEG C, and dry flue gas flow velocity is 2 ~ 3m/s, and time of drying is 4 ~ 6h.
SiO in higher, the high silicon concentrate of CaO content in, converter OG sludge higher according to carbon content in blast furnace gas plaster
2the feature that content is higher, by the reasonable batching to three kinds of materials, Iron grade in mixture can be made to reach 38 ~ 43%, carbon content reaches 15 ~ 20%, silicone content reaches 8 ~ 10%, CaO content reaches 3 ~ 5%, after this mixture being carried out profit mill, briquetting and drying, enter the product iron grade of the explained hereafter such as tunnel kiln direct reduced and cooling more than 55%, degree of metalization is more than 85%.In mixture, wilkinite uses as binding agent, and the converter OG sludge containing 6 ~ 9%CaO, also has the effect of binding agent.
(2) tunnel kiln reduction roasting: briquetting will be given birth to and send in tunnel furnace, carry out preheating with the high-temperature flue gas heat exchange of adverse current, the raw briquetting after preheating enters heating zone and carries out reducing roasting, and the high-temperature roasting ore deposit after reduction cools at tunnel furnace cooling section, come out of the stove, obtain prereduced burden; The concrete technology parameter of described reducing roasting is: reducing roasting temperature is 1050 ~ 1200 DEG C, and sintering time is 8 ~ 12h; High-temperature roasting ore deposit after reduction enters tunnel furnace cooling section and adopts blast furnace gas to cool, blast furnace gas after preheating flows and to burn after tunnel furnace heating zone mixes with combustion air, and the high-temperature flue gas of generation flows to tunnel preheating section of kiln and heats material.
(3) screening of prereduced burden: roasted ore after broken and screening, granularity be 5 ~ 50mm as blast furnace raw material; Granularity is less than 5mm, degree of metalization 92% above as converter raw material; The carrying out that granularity is greater than 50mm is again broken.
(4) recovery of zinc: dezincify technique mainly utilizes the boiling point of zinc lower, under high temperature reducing conditions, the oxide compound of zinc is reduced, and volatilization of vaporizing becomes metallic vapor, along with flue gas is discharged, zinc is separated from raw briquetting, zinc fume is easy to again the oxide particle of oxidized formation zinc, be collected in dust-removal system together with flue dust, obtain the rich zinc powder dirt that ZnO content is 30 ~ 50%, thus solve the circulation collection problem of zinc.
Beneficial effect of the present invention:
1, for the metallurgical composition feature of blast furnace gas plaster, converter OG sludge, high silicon iron concentrate, adopt in ion dust mud contaning with addition of a certain proportion of converter OG sludge and high silicon iron concentrate, through tunnel furnace high temperature reduction after mixing briquetting, can reasonably be utilized by the component such as ferriferous oxide, carbon, calcium oxide in ion dust mud contaning, the prereduced burden Iron grade obtained more than 55%, degree of metalization more than 85%, realize the high value added utilization of ion dust mud contaning and high silicon iron concentrate.
2, the prereduced burden of the present invention's production, its intensity can meet the metallurgical performance requirement of blast-furnace burden.
3, technical process is simple, solves the removal problem of metallic zinc in ferrous material, heat Appropriate application, save energy.
Accompanying drawing explanation
Fig. 1 is present invention process schema.
Embodiment
The main raw material of following examples comprises: blast furnace gas plaster, converter OG sludge, high silicon iron concentrate.Wherein blast furnace gas plaster is mixed according to the weight ratio of 100:50 ~ 60:40 ~ 50 by the gravitational dust collection ash of blast furnace by-product, gas ash and gas mud.
Main raw material chemical composition is as shown in the table:
Embodiment 1:
(1) mixing of material: be stir water content after the blast furnace gas plaster of 8%, converter OG sludge, high silicon iron concentrate and wilkinite are prepared burden by the weight ratio of 100:20:70:2, make it to become mixture.
The profit mill of material, briquetting and drying: be transported to by mixture in the hopper of briquetting press, make mixture moistening by water spray, and material is by the mechanical force briquetting of briquetting press simultaneously, and qualified briquetting takes out in briquetting press.The size control of briquetting is 53 × 115 × 230mm, and moisture content controls 5 ~ 7%.Qualified briquetting is sent in dry kiln and is carried out drying, the thermal source of dry kiln adopts the flue gas of 200 ~ 400 DEG C that discharge from tunnel furnace, control time of drying as 5h, the flow rate control of flue gas in dry kiln is 2 ~ 3m/s, and the drying temperature of briquetting controls to be 100 ~ 250 DEG C.
(2) give birth to reducing roasting and the cooling of briquetting: what tunnel furnace delivered to by dried briquetting enters kiln side, the hydraulic pusher through kiln tail is sent in tunnel furnace.Briquetting preheating zone and adverse current and the high-temperature flue gas that comes carries out heat exchange in kiln, briquetting reaches after more than 600 DEG C in temperature and starts to reduce, and when briquetting enters into heating zone and its temperature reaches 1050 ~ 1200 DEG C, carries out high temperature reduction.Tunnel furnace thermal source carries out the produced high-temperature flue gas that burns after adopting the high temperature preheating coal gas come from cooling section flowing to mix with the combustion air that heating zone is blown into.Briquetting high temperature reduction time controling in tunnel furnace is 11h.After direct-reduction, temperature is the cooling section that the high-temperature roasting ore deposit of 1050 ~ 1200 DEG C enters into tunnel furnace, heat exchange is carried out with the normal temperature blast furnace gas sprayed into from kiln hood, discharge from tunnel furnace when high-temperature roasting ore deposit is cooled to below 200 ~ 300 DEG C, cooling time, control was 6 ~ 8h.
(3) fragmentation of roasted ore and screening: the roasted ore Iron grade after reduction is more than 55%, and degree of metalization is more than 85%, and after broken and screening, granularity is the direct as blast furnace raw material of 5 ~ 50mm; Be 0 ~ 5mm through ore grinding, magnetic separation, briquetting granularity, degree of metalization reaches more than 92% as converter raw material; Granularity be greater than 50mm return crusher in crushing after again sieve.
(4) collect rich zinc powder dirt: in tunnel furnace dust-removal system, collect rich zinc powder dirt, ZnO content is 40%.
Embodiment 2
(1) mixing of material: be stir water content after the blast furnace gas plaster of 6%, converter OG sludge, high silicon iron concentrate and wilkinite are prepared burden by the weight ratio of 100:30:60:2, make it to become mixture.
The profit mill of material, briquetting and drying: be transported to by mixture in the hopper of briquetting press, make mixture moistening by water spray, and material is by the mechanical force briquetting of briquetting press simultaneously, and qualified briquetting takes out in briquetting press.The size control of briquetting is 53 × 115 × 230mm, and moisture content is 5%.Qualified briquetting is sent in dry kiln and is carried out drying, the thermal source of dry kiln adopts the flue gas of 200 ~ 400 DEG C that discharge from tunnel furnace, control time of drying as 4h, the flow rate control of flue gas in dry kiln is 2 ~ 3m/s, and the drying temperature of briquetting controls to be 100 ~ 250 DEG C.
(2) give birth to reducing roasting and the cooling of briquetting: what tunnel furnace delivered to by dried briquetting enters kiln side, the hydraulic pusher through kiln tail is sent in tunnel furnace.Briquetting preheating zone and adverse current and the high-temperature flue gas that comes carries out heat exchange in kiln, briquetting reaches after more than 600 DEG C in temperature and starts to reduce, and when briquetting enters into heating zone and its temperature reaches 1050 ~ 1200 DEG C, carries out high temperature reduction.Tunnel furnace thermal source carries out the produced high-temperature flue gas that burns after adopting the high temperature preheating coal gas come from cooling section flowing to mix with the combustion air that heating zone is blown into.Briquetting high temperature reduction time controling in tunnel furnace is 11h.After direct-reduction, temperature is the cooling section that the high-temperature roasting ore deposit of 1050 ~ 1200 DEG C enters into tunnel furnace, heat exchange is carried out with the normal temperature blast furnace gas sprayed into from kiln hood, discharge from tunnel furnace when high-temperature roasting ore deposit is cooled to below 200 ~ 300 DEG C, control cooling time as 8h.
(3) fragmentation of roasted ore and screening: the roasted ore Iron grade after reduction is more than 55%, and degree of metalization is more than 85%, and after broken and screening, granularity is the direct as blast furnace raw material of 5 ~ 50mm; Be 0 ~ 5mm through ore grinding, magnetic separation, briquetting granularity, degree of metalization reaches more than 92% as converter raw material; Granularity be greater than 50mm return crusher in crushing after again sieve.
(4) collect rich zinc powder dirt: in tunnel furnace dust-removal system, collect rich zinc powder dirt, ZnO content is 45%.
Claims (4)
1. utilize ion dust mud contaning and high silicon iron concentrate to produce the technique of prereduced burden, comprise the following steps:
(1) blast furnace gas plaster, converter OG sludge, high silicon iron concentrate and wilkinite are uniformly mixed, mixture obtains raw briquetting through profit mill, briquetting, drying; Described blast furnace gas plaster, converter OG sludge, high silicon iron concentrate and bentonitic weight ratio are 100:20 ~ 30:60 ~ 70:2 ~ 3; The processing parameter of described drying is: drying temperature is 100 ~ 250 DEG C, and dry flue gas flow velocity is 2 ~ 3m/s, and time of drying is 4 ~ 6h;
(2) will give birth to briquetting to send in tunnel furnace, carry out preheating with the high-temperature flue gas heat exchange of adverse current, the raw briquetting after preheating enters heating zone and carries out reducing roasting, in the cooling of tunnel furnace cooling section, comes out of the stove, obtain prereduced burden in the high-temperature roasting ore deposit after reduction; The concrete technology parameter of described reducing roasting is: reducing roasting temperature is 1050 ~ 1200 DEG C, and sintering time is 8 ~ 12h.
2. utilize ion dust mud contaning and high silicon iron concentrate to produce the technique of prereduced burden as claimed in claim 1, it is characterized in that, also comprise the steps: to collect the rich zinc powder dirt in tunnel furnace flue dust dust-removal system.
3. utilize ion dust mud contaning and high silicon iron concentrate to produce the technique of prereduced burden as claimed in claim 1, it is characterized in that, also comprise the steps: the prereduced burden obtained in step (2) to carry out fragmentation and screening, granularity be 5 ~ 50mm as blast furnace raw material; Granularity is less than 5mm, degree of metalization more than 92% as converter raw material; The carrying out that granularity is greater than 50mm is again broken.
4. utilize ion dust mud contaning and high silicon iron concentrate as described in claim 1-3 any one produce the technique of prereduced burden, it is characterized in that: the high-temperature roasting ore deposit after reduction described in step (2) enters tunnel furnace cooling section and adopts blast furnace gas to cool, blast furnace gas after preheating flows and to burn after tunnel furnace heating zone mixes with combustion air, and the high-temperature flue gas of generation flows to tunnel preheating section of kiln and heats material.
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| CN105039689A (en) * | 2015-09-11 | 2015-11-11 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Fast cooling device and method for iron ore tunnel kiln high-temperature reduction materials in kiln |
| CN107419108A (en) * | 2017-07-31 | 2017-12-01 | 宝武集团环境资源科技有限公司 | A kind of method dried using rotary hearth furnace waste heat from tail gas |
| CN111485098A (en) * | 2020-04-15 | 2020-08-04 | 湘潭高新区风动机械有限公司 | Method for dezincification of converter mud by microwave reduction roasting |
| CN113981228A (en) * | 2021-10-14 | 2022-01-28 | 辽宁科技大学 | Method for inhibiting ring formation in kiln and improving recovery rate of zinc |
| CN114457233A (en) * | 2022-01-13 | 2022-05-10 | 湖南博一环保科技有限公司 | Method for cooperatively treating iron and steel dust mud and iron-containing ore sand by using rotary kiln |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1664120A (en) * | 2005-04-04 | 2005-09-07 | 张清学 | Process for preparing slag by pelletization of steel-making dust slime |
| CN102605174A (en) * | 2012-04-05 | 2012-07-25 | 北京科技大学 | Process method for respectively recovering nickel and iron from low-nickel high-iron laterite |
| CN103643035A (en) * | 2013-12-11 | 2014-03-19 | 广西大学 | Recovery method of iron in gossan ore |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1664120A (en) * | 2005-04-04 | 2005-09-07 | 张清学 | Process for preparing slag by pelletization of steel-making dust slime |
| CN102605174A (en) * | 2012-04-05 | 2012-07-25 | 北京科技大学 | Process method for respectively recovering nickel and iron from low-nickel high-iron laterite |
| CN103643035A (en) * | 2013-12-11 | 2014-03-19 | 广西大学 | Recovery method of iron in gossan ore |
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