CN103952540A - Technology for producing metallized furnace charge from iron-containing dust and high-silicon iron concentrate - Google Patents
Technology for producing metallized furnace charge from iron-containing dust and high-silicon iron concentrate Download PDFInfo
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- CN103952540A CN103952540A CN201410110177.7A CN201410110177A CN103952540A CN 103952540 A CN103952540 A CN 103952540A CN 201410110177 A CN201410110177 A CN 201410110177A CN 103952540 A CN103952540 A CN 103952540A
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Abstract
The invention discloses a technology for producing metallized furnace charge from iron-containing dust and high-silicon iron concentrate. The technology comprises the following steps of mixing blast furnace gas plaster, converter OG sludge, high-silicon iron concentrate and bentonite according to a weight ratio of 100: 20-30: 60-70: 2-3 to obtain a uniform mixture, wherein the blast furnace gas plaster has water content less than 8%, carrying out wet-grinding, briquetting and drying on the mixture to obtain raw pressed blocks, feeding the raw pressed blocks into a tunnel kiln, and carrying out pre-heating and reduction calcination to obtain the metallized furnace charge. The technology realizes reasonable matching of all the raw materials, realizes reasonable utilization of iron oxide, carbon and calcium oxide components in the iron-containing dust and has a product iron grade more than 55% and a metallization rate more than 85%. The technology has the advantages of simple processes, large treatment amount, full resource recovery utilization and less pollution.
Description
Technical field
The invention belongs to ferrous metallurgy field, be specifically related to a kind ofly taking ion dust mud contaning and high silicon iron concentrate as raw material, utilize tunnel kiln reduction to produce the technique of prereduced burden.
Background technology
China is Iron and Steel Production big country, since iron and steel output to 1996 year, has occupied world's umber one always, but huge turnout has also caused 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, be can second stage employ resource.
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 contains the beneficial element such as iron and carbon, also contains a small amount of harmful element such as zinc, lead simultaneously.At present, most domestic iron and steel enterprise carries out sintering using blast furnace gas plaster, converter OG sludge etc. as raw materials for sintering, although this method has realized the recycling of resource, but allocate dirt mud in raw materials for sintering into because its granularity is thinner, can affect the ventilation property of sinter bed and the intensity of agglomerate, the Volatile Elements such as Zn, Pb simultaneously containing in dirt mud, also can be at blast furnace circulating enrichment, cause in blast furnace gas Zn content constantly to rise and in upper blast furnace dross, cause blast furnace gas pipeline to stop up, affect the normal operation of blast furnace.
For iron-containing waste is rationally utilized, domestic iron and steel enterprises is done a lot of work aspect the utilizing of iron containing sludge, dust the like waste nearly ten years.(1) according to CaO in steel making dust slime and the higher feature of FeO content, steel making dust slime is pressed into cooled agglomerated pellet, add and in STEELMAKING PRODUCTION, carry out second stage employ, although this method has been utilized ferriferous oxide and the calcium oxide in steel making dust slime preferably, but because the also commercial weight to ferriferous oxide in steelmaking process is limited, can only in smelting, add on a small quantity, cooled agglomerated pellet balling property and high temperature metallurgical properties that simultaneously prepared by this method are poor, easily efflorescence, not beneficial independent use; (2) blast furnace gas plaster is owing to containing the harmful elements such as a certain amount of Zn, Pb, when adopting rotary hearth furnace to take off after Zn, Pb, carbon and ferriferous oxide that recycling wherein contains, but because of its carbon content higher, directly its intensity of briquetting is lower, and briquetting is easily broken in reducing roasting, though can be by making carbonaceous pelletizing with addition of a certain amount of iron scale, and it is at high temperature reduced, but exist the large and high phenomenon of reduction temperature of energy consumption.
Zinc element in ion dust mud contaning has considerable influence to the recycling of ion dust mud contaning, and general selection carried out ion dust mud contaning dezincify and zinc is reclaimed.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 this technique requires high to the physicals of raw material, and dust mud etc. needs briquetting.Rotary hearth furnace process can be disposed various iron dust containings, and processing efficiency is higher, and can reclaim well containing metals such as the iron in zinc fume mud, zinc, lead.But exist 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, processes Dust Capacity 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 has the problem of easy 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 to use, 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, while adopting the conventional direct reduction process such as rotary hearth furnace to utilize, its production cost is higher, resource utilization is low, and simultaneously direct-reduction product silicone content is higher, and directly supplying with converter, to make steel-making furnace charge very uneconomical.
Summary of the invention
The present invention overcomes deficiency of the prior art, and a kind of ion dust mud contaning and high silicon iron concentrate tunnel kiln reducing process are provided, thereby obtains reasonable ratio, prereduced burden that intensity is high.
The technique that the present invention utilizes ion dust mud contaning and high silicon iron concentrate to produce 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 through profit mill, briquetting, dryly obtain raw briquetting; 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%; When mixture moistens mill and briquetting, briquetting size control is at 53 × 53 × 115mm～53 × 230 × 230mm, and the moisture content of briquetting is controlled at 5～7%; Dry processing parameter is: drying temperature is 100～250 DEG C, and dry flue gas flow velocity is 2～3m/s, and be 4～6h time of drying.
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, can make in mixture that iron grade reaches 38～43%, carbon content reaches 15～20%, silicone content reaches 8～10%, CaO content reaches 3～5%, by this mixture moisten mill, briquetting and dry after, the product iron grade that enters the explained hereafter such as tunnel kiln direct reduced and cooling more than 55%, degree of metalization is more than 85%.In mixture, wilkinite is to use as binding agent, and the converter OG sludge that contains 6～9% CaO, also has the effect of binding agent.
(2) tunnel kiln reduction roasting: life briquetting is sent 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 is cooling 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 carry out cooling, blast furnace gas after preheating flows and burns after tunnel furnace heating zone is mixed with combustion air, and the high-temperature flue gas of generation flows to tunnel preheating section of kiln material is heated.
(3) screening of prereduced burden: roasted ore is after broken and screening, and granularity is 5～50mm as blast furnace raw material; Granularity is less than 5mm, degree of metalization 92% above as converter raw material; Granularity is greater than the carrying out fragmentation again of 50mm.
(4) recovery of zinc: dezincify technique is mainly to utilize the boiling point of zinc lower, under high temperature reduction condition, the oxide compound of zinc is reduced, and vaporization volatilization 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, in dust-removal system, be collected together with flue dust, obtain ZnO content and be 30～50% rich zinc powder dirt, thereby solved the circulation enrichment problem of zinc.
Beneficial effect of the present invention:
1, for the metallurgical component characteristics 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, mix after briquetting through tunnel furnace high temperature reduction, the components such as ferriferous oxide in can ion dust mud contaning, carbon, calcium oxide are reasonably utilized, the prereduced burden iron grade obtaining 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 that the present invention produces, its intensity can meet the metallurgical performance requirement of blast-furnace burden.
3, technical process is simple, has solved the removal problem of metallic zinc in ferrous material, and heat rationally utilizes, save energy.
Brief description of the drawings
Fig. 1 is process flow sheet of the present invention.
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 gravitational dust collection ash, gas ash and the gas mud of blast furnace by-product.
Main raw material chemical composition is as shown in the table:
Embodiment 1:
(1) mixing of material: the blast furnace gas plaster that is 8% by water content, converter OG sludge, high silicon iron concentrate and wilkinite stir after preparing burden by the weight ratio of 100:20:70:2, make it to become mixture.
The profit mill of material, briquetting and dry: mixture is transported in the hopper of briquetting press, makes mixture by moistening by water spray, 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 controlled at 5～7%.Qualified briquetting is sent in dry kiln and is dried, the thermal source of dry kiln adopts the flue gas of 200～400 DEG C of discharging 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 control of briquetting is 100～250 DEG C.
(2) give birth to the reducing roasting of briquetting and cooling: what dried briquetting was delivered to tunnel furnace enters kiln side, sends in tunnel furnace through the hydraulic pusher of kiln tail.Briquetting preheating zone and adverse current and the high-temperature flue gas that comes carries out heat exchange in kiln, briquetting starts to reduce after temperature reaches more than 600 DEG C, in the time that briquetting enters into heating zone and its temperature and reaches 1050～1200 DEG C, carries out high temperature reduction.Produced high-temperature flue gas burns the combustion air that the employing of tunnel furnace thermal source is blown into heating zone from the mobile next high temperature preheating coal gas of cooling section mixes.Briquetting high temperature reduction time in tunnel furnace is controlled as 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, carry out heat exchange with the normal temperature blast furnace gas spraying into from kiln hood, in the time that high-temperature roasting ore deposit is cooled to below 200～300 DEG C, from tunnel furnace, discharge, cooling time, control was 6～8h.
(3) the broken and screening of roasted ore: 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 5～50mm directly as blast furnace raw material; Be 0～5mm through ore grinding, magnetic separation, briquetting granularity, degree of metalization reaches more than 92% as converter raw material; Granularity is greater than the screening again after crusher in crushing of returning of 50mm.
(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: the blast furnace gas plaster that is 6% by water content, converter OG sludge, high silicon iron concentrate and wilkinite stir after preparing burden by the weight ratio of 100:30:60:2, make it to become mixture.
The profit mill of material, briquetting and dry: mixture is transported in the hopper of briquetting press, makes mixture by moistening by water spray, 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 dried, the thermal source of dry kiln adopts the flue gas of 200～400 DEG C of discharging 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 control of briquetting is 100～250 DEG C.
(2) give birth to the reducing roasting of briquetting and cooling: what dried briquetting was delivered to tunnel furnace enters kiln side, sends in tunnel furnace through the hydraulic pusher of kiln tail.Briquetting preheating zone and adverse current and the high-temperature flue gas that comes carries out heat exchange in kiln, briquetting starts to reduce after temperature reaches more than 600 DEG C, in the time that briquetting enters into heating zone and its temperature and reaches 1050～1200 DEG C, carries out high temperature reduction.Produced high-temperature flue gas burns the combustion air that the employing of tunnel furnace thermal source is blown into heating zone from the mobile next high temperature preheating coal gas of cooling section mixes.Briquetting high temperature reduction time in tunnel furnace is controlled as 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, carry out heat exchange with the normal temperature blast furnace gas spraying into from kiln hood, in the time that high-temperature roasting ore deposit is cooled to below 200～300 DEG C, from tunnel furnace, discharge, control cooling time as 8h.
(3) the broken and screening of roasted ore: 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 5～50mm directly as blast furnace raw material; Be 0～5mm through ore grinding, magnetic separation, briquetting granularity, degree of metalization reaches more than 92% as converter raw material; Granularity is greater than the screening again after crusher in crushing of returning of 50mm.
(4) collect rich zinc powder dirt: in tunnel furnace dust-removal system, collect rich zinc powder dirt, ZnO content is 45%.
Claims (7)
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 is through profit mill, briquetting, the dry life briquetting that obtains; Described blast furnace gas plaster, converter OG sludge, high silicon iron concentrate and bentonitic weight ratio are 100:20～30:60～70:2～3;
(2) life briquetting is sent in tunnel furnace, carried 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 is cooling at tunnel furnace cooling section, comes out of the stove, and obtains prereduced burden.
2. the technique of utilizing ion dust mud contaning and high silicon iron concentrate to produce prereduced burden as claimed in claim 1, is characterized in that, also comprises the steps: to collect the rich zinc powder dirt in tunnel furnace flue dust dust-removal system.
3. the technique of utilizing ion dust mud contaning and high silicon iron concentrate to produce prereduced burden as claimed in claim 1, it is characterized in that, also comprise the steps: the prereduced burden obtaining in step (2) to carry out fragmentation and screening, granularity is 5～50mm as blast furnace raw material; Granularity is less than 5mm, degree of metalization more than 92% as converter raw material; Granularity is greater than the carrying out fragmentation again of 50mm.
4. the technique of utilizing ion dust mud contaning and high silicon iron concentrate to produce prereduced burden as claimed in claim 1, is characterized in that: the moisture content of described blast furnace gas plaster is less than 8%.
5. the technique of utilizing ion dust mud contaning and high silicon iron concentrate to produce prereduced burden as described in claim 1-4 any one, it is characterized in that: in step (1), described dry processing parameter is: drying temperature is 100～250 DEG C, dry flue gas flow velocity is 2～3m/s, and be 4～6h time of drying.
6. the technique of utilizing ion dust mud contaning and high silicon iron concentrate to produce prereduced burden as described in claim 1-4 any one, it is characterized in that: in step (2), the concrete technology parameter of described reducing roasting is: reducing roasting temperature is 1050～1200 DEG C, and sintering time is 8～12h.
7. the technique of utilizing ion dust mud contaning and high silicon iron concentrate to produce prereduced burden as described in claim 1-4 any one, it is characterized in that: the high-temperature roasting ore deposit described in step (2) after reduction enters tunnel furnace cooling section and adopts blast furnace gas to carry out cooling, blast furnace gas after preheating flows and burns after tunnel furnace heating zone is mixed with combustion air, and the high-temperature flue gas of generation flows to tunnel preheating section of kiln material is heated.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| 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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2014
- 2014-03-24 CN CN201410110177.7A patent/CN103952540B/en active Active
Patent 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 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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