CN105177195A - Process for directly smelting molten iron through powdery iron-containing dust slime - Google Patents
Process for directly smelting molten iron through powdery iron-containing dust slime Download PDFInfo
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- CN105177195A CN105177195A CN201510645962.7A CN201510645962A CN105177195A CN 105177195 A CN105177195 A CN 105177195A CN 201510645962 A CN201510645962 A CN 201510645962A CN 105177195 A CN105177195 A CN 105177195A
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- iron
- molten iron
- slag
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- dirt mud
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Abstract
The invention discloses a process for directly smelting molten iron through powdery iron-containing dust slime. The powdery iron-containing dust slime is sprayed into a smelter, and meanwhile reducing agents and slagging solvents are sprayed into the smelter; in the high-temperature smelter, the powdery iron-containing dust slime is reduced through the sprayed reducing agents under a high-temperature condition, and ZnO in the dust slime is recovered from gas at an outlet of the smelter; after slag and iron separation, molten iron obtained through separation is introduced into the steel-making process; and dust slime slag obtained after slag and iron separation is placed in a hardening, tempering and heat compensation furnace to be subjected to hardening, tempering and heat compensation, and the dust slime slag can be used for producing high-additional-value silicate products such as cement or mineral wool or microcrystalline glass. According to the process, the molten iron is directly smelted through the powdery iron-containing dust slime by means of the smelter, and the dust slime agglomeration process is omitted; the obtained molten iron is used for the steel-making process, the obtained slag is subjected to heat compensation, hardening and tempering to be used as raw materials of the cement, the mineral wool, the microcrystalline glass and the like, and therefore the comprehensive utilization efficiency of the iron-containing dust slime is improved, and the energy consumption of the comprehensive utilization process of the iron-containing dust slime is reduced.
Description
Technical field
The present invention relates to a kind of directly by powdery iron-containing dirt mud smelting molten iron technique, belong to ion dust mud contaning field of comprehensive utilization.
Prior art
At present, in ion dust mud contaning, the dirt mud that steel-making iron-smelting process produces mostly returns iron making and sintering technique or cold pressing block returns process for making use, and the dirt mud produced in process for making alumina is then mostly by magnetic separation process comprehensive utilization after landfill, magnetic separation or direct-reduction.But the dirt mud produced due to steel-making iron-smelting process contains ZnO and other alkali metal impurity, a lot of negative efficiency is brought to steel-making, iron-smelting process, the dirt mud produced in process for making alumina is also because landfill contaminate environment, efficiency of magnetic separation are low, and overall synthetic utilising efficiency is low.
Also have ion dust mud contaning pelletizing or briquetting (pressure ball), through technique direct-reductions such as rotary hearth furnace, rotary kiln or tunnel furnace, contained FeOx is reduced except the ZnO in dust mud and other alkali metal impurity, in rotary hearth furnace flue gas, reclaim ZnO.The DRI that direct-reduction obtains is used in blast furnace ironmaking or process for making, but because direct-reduction technique removal impurity is insufficient, the DRI quality of output is lower, also have a negative impact, so the comprehensive utilization of ion dust mud contaning is also very restricted in this process for making steel iron-smelting process to follow-up.
Therefore the present invention propose spray in (adding) smelting furnace by powdery iron-containing dirt mud, simultaneously spray into (adding) reductive agent and sludging flux in a furnace.In high-temperature smelting pot, the reductive agent sprayed into reduces ion dust mud contaning under the high temperature conditions, reclaims the ZnO in dirt mud in smelting furnace outlet coal gas.After slag sluicing system, separating obtained molten iron enters process for making, the dirt mud slag after metal separation, modified through concurrent heating, can be used for producing the high added value silicate products such as cement, mineral wool or devitrified glass.Whole technique, directly sprays into ion dust mud contaning in (adding) smelting furnace, is all fully utilized by ion dust mud contaning, has reclaimed the metal ingredient such as Zn, Fe in dirt mud, the SiO in ion dust mud contaning
2, Al
2o
3, the component such as CaO also becomes the raw material producing the high added value silicate products such as cement, mineral wool or devitrified glass.Thus improve whole ion dust mud contaning comprehensive utilization ratio, also improve the economic benefit of ion dust mud contaning comprehensive utilization.There is obvious energy-conserving and environment-protective advantage.Through patent and literature query investigation, association area is without similar technological invention.
Summary of the invention
The object of the invention is the problem in order to solve above-mentioned prior art, providing a kind of directly by powdery iron-containing dirt mud smelting molten iron technique.
The object of the invention is to be achieved through the following technical solutions:
A kind of directly by powdery iron-containing dirt mud smelting molten iron technique, the steps include:
1) spray in (adding) smelting furnace by powdery iron-containing dirt mud, spray into (adding) reductive agent and sludging flux in a furnace simultaneously;
2), in high-temperature smelting pot, the reductive agent sprayed into reduces ion dust mud contaning under the high temperature conditions, reclaims the ZnO in dirt mud in smelting furnace outlet coal gas; The molten iron that reduction generates enters next step;
3) after slag sluicing system, separating obtained molten iron enters process for making;
4) the dirt mud slag after slag sluicing system, is placed in the modified concurrent heating of modified afterburning furnace, can be used for producing the high added value silicate products such as cement, mineral wool or devitrified glass.
Wherein, described powdery iron-containing dirt mud drum draws together the main component of following weight percent meter:
FeO
x% is 30-60%, C% be 3-20%, ZnO% is 0.2-20%, Al
2o
3% is 2-15%, CaO% is 5-20%;
Described reductive agent is be selected from the one in coal dust, broken Jiao and blue charcoal, and the consumption of reductive agent is 10-25%.
Described high-temperature smelting pot is greater than 1550 DEG C.
Described sludging flux is one or both mixing be selected from lime and rhombspar; Consumption is: 10-20%.
In the whole technique of the present invention, directly ion dust mud contaning is sprayed in smelting furnace, ion dust mud contaning is all fully utilized, reclaimed the metal ingredient such as Zn, Fe in dirt mud, the SiO in ion dust mud contaning
2, Al
2o
3, the component such as CaO also becomes the raw material producing the high added value silicate products such as cement, mineral wool or devitrified glass.
Beneficial effect of the present invention is:
The present invention directly uses the ion dust mud contaning smelting molten iron of powdery by smelting furnace, eliminate dirt mud agglomeration (pelletizing) technique, the molten iron obtained is used for process for making, the slag obtained is by the modified raw material as cement, mineral wool devitrified glass etc. of concurrent heating, thus improve the comprehensive utilization ratio of ion dust mud contaning, reduce ion dust mud contaning comprehensive utilization process energy consumption.
Embodiment
Technical characterstic of the present invention is set forth further below in conjunction with specific embodiment.
Embodiment 1-5 adopts following technique:
By ion dust mud contaning, with reductive agent, flux, join in smelting furnace by spray gun or chute, smelting furnace by heated by electrodes or electrode and combustion gas by fuel burner nozzle Hybrid Heating, in molten bath, ion dust mud contaning reduces, after reduction, molten iron enters process for making, the modified concurrent heating in modified afterburning furnace of separating obtained dirt mud slag, can be used for producing the high added value silicate products such as cement, mineral wool or devitrified glass.ZnO dust is reclaimed in smelting furnace outlet coal gas.
Embodiment 1
The ion dust mud contaning that steel manufacture process produces, in ion dust mud contaning, FeOx% is 55%, C% is 3%, ZnO% is 0.7%, CaO% is 12%, with reductive agent, flux, join in smelting furnace by spray gun, smelting furnace is by heated by electrodes, and in molten bath, ion dust mud contaning reduces, after reduction, molten iron enters process for making, separating obtained dirt mud slag, through modified concurrent heating in modified afterburning furnace, can be used for producing cement.ZnO dust is reclaimed in smelting furnace outlet coal gas.
Reductive agent is coal dust mainly, and consumption is: 20%.Sludging flux is lime mainly, and consumption is: 15%.Reduction in-furnace temperature is about 1550 DEG C.The temperature of modified concurrent heating is about 1450 DEG C.
Embodiment 2
Aluminum Al
2o
3the ion dust mud contaning that production process produces, in ion dust mud contaning, FeOx% is 40%, ZnO% is 0.05%, CaO% is 12%, SiO
2% is 8%, with reductive agent, flux, join in smelting furnace by spray gun, smelting furnace is by heated by electrodes, in molten bath, ion dust mud contaning reduces, and after reduction, molten iron enters process for making, separating obtained dirt mud slag, through modified concurrent heating in modified afterburning furnace, can be used for producing the high added value silicate products such as cement, mineral wool or devitrified glass.ZnO dust is reclaimed in smelting furnace outlet coal gas.
Reductive agent is broken Jiao mainly, and consumption is: 10%.The two mixture of sludging flux mainly lime, rhombspar, consumption is: 15%.Reduction in-furnace temperature is about 1550 DEG C.The temperature of modified concurrent heating is about 1450 DEG C.
As different from Example 1, use the ion dust mud contaning produced in steel manufacture process in embodiment 1, wherein ZnO content is higher for embodiment 2, and embodiment 2 uses Al
2o
3the ion dust mud contaning produced in production process, wherein ZnO content is lower, FeOx content is also lower.
Embodiment 3
The ion dust mud contaning 1 that steel manufacture process produces, in ion dust mud contaning, FeOx% is 55%, C% is 3%, ZnO% is 0.7%, CaO% is 12%, with reductive agent, flux, join in smelting furnace by chute, smelting furnace is by heated by electrodes, and in molten bath, ion dust mud contaning reduces, after reduction, molten iron enters process for making, separating obtained dirt mud slag, through modified concurrent heating in modified afterburning furnace, can be used for producing the high added value silicate products such as cement, mineral wool or devitrified glass.ZnO dust is reclaimed in smelting furnace outlet coal gas.
Reductive agent is coal dust mainly, and consumption is: 15%.Sludging flux is lime, and consumption is: 15%.Reduction in-furnace temperature is about 1550 DEG C.The temperature of modified concurrent heating is about 1450 DEG C.
As different from Example 1, in embodiment 1, ion dust mud contaning is added by spray gun embodiment 3, and in embodiment 3, ion dust mud contaning is added by chute.
Embodiment 4
The ion dust mud contaning that steel manufacture process produces, in ion dust mud contaning, FeOx% is 55%, C% is 3%, ZnO% is 0.7%, CaO% is 12%, with reductive agent, flux, join in smelting furnace by chute, smelting furnace is by electrode and fuel burner nozzle Hybrid Heating, and in molten bath, ion dust mud contaning reduces, after reduction, molten iron enters process for making, separating obtained dirt mud slag, through modified concurrent heating in modified afterburning furnace, can be used for producing the high added value silicate products such as cement, mineral wool or devitrified glass.ZnO dust is reclaimed in smelting furnace outlet coal gas.
Reductive agent is blue charcoal mainly, and consumption is: 15%.Sludging flux is lime mainly, and consumption is: 15%.Reduction in-furnace temperature is about 1550 DEG C.The temperature of modified concurrent heating is about 1450 DEG C.
As different from Example 1, in embodiment 1, furnace heats is by heated by electrodes for embodiment 4, and in embodiment 4, smelting furnace is by electrode and fuel burner nozzle Hybrid Heating.
Embodiment 5
The ion dust mud contaning that steel manufacture process produces, in ion dust mud contaning, FeOx% is 55%, C% is 3%, ZnO% is 0.7%, CaO% is 12%, with reductive agent, flux, join in smelting furnace by spray gun, smelting furnace is by heated by electrodes, and in molten bath, ion dust mud contaning reduces, after reduction, molten iron enters process for making, separating obtained dirt mud slag, through modified concurrent heating in modified afterburning furnace, can be used for slag wool production or devitrified glass.ZnO dust is reclaimed in smelting furnace outlet coal gas.
Reductive agent is coal dust mainly, and consumption is: 25%.Sludging flux is rhombspar mainly, and consumption is: 15%.Reduction in-furnace temperature is about 1550 DEG C.The temperature of modified concurrent heating is about 1450 DEG C.
As different from Example 1, in embodiment 1, dirt mud slag is for the production of cement for embodiment 5, and in embodiment 5, dirt mud slag is for the production of mineral wool or devitrified glass.
Claims (5)
1., directly by a powdery iron-containing dirt mud smelting molten iron technique, it is characterized in that: the steps include:
1) spray in (adding) smelting furnace by powdery iron-containing dirt mud, spray into (adding) reductive agent and sludging flux in a furnace simultaneously;
2), in high-temperature smelting pot, the reductive agent sprayed into reduces ion dust mud contaning under the high temperature conditions, reclaims the ZnO in dirt mud in smelting furnace outlet coal gas; The molten iron that reduction generates enters next step;
3) after slag sluicing system, separating obtained molten iron enters process for making;
4) the dirt mud slag after slag sluicing system, is placed in the modified concurrent heating of modified afterburning furnace, can be used for producing the high added value silicate products such as cement, mineral wool or devitrified glass.
2. one according to claim 1 directly uses powdery iron-containing dirt mud smelting molten iron technique, it is characterized in that: described powdery iron-containing dirt mud drum draws together the main component of following weight percent meter: FeO
x% is 30-60%, C% be 3-20%, ZnO% is 0.2-20%, Al
2o
3% is 2-15%, CaO% is 5-20%.
3. one according to claim 1 directly uses powdery iron-containing dirt mud smelting molten iron technique, it is characterized in that: described reductive agent is be selected from the one in coal dust, broken Jiao and blue charcoal, and the consumption of reductive agent is 10-25%.
4. one according to claim 1 directly uses powdery iron-containing dirt mud smelting molten iron technique, it is characterized in that: described high-temperature smelting pot is greater than 1550 DEG C.
5. one according to claim 1 directly uses powdery iron-containing dirt mud smelting molten iron technique, it is characterized in that: described sludging flux is one or both mixing be selected from lime and rhombspar; Consumption is: 10-20%.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107541575A (en) * | 2016-06-29 | 2018-01-05 | 宝山钢铁股份有限公司 | A kind of blast furnace dedusting ash retracting device and method |
| CN108178502A (en) * | 2017-12-11 | 2018-06-19 | 鞍钢股份有限公司 | Utilize low iron metallurgical waste and the method for blast furnace cinder production mineral wool and molten iron |
| CN109942202A (en) * | 2019-04-04 | 2019-06-28 | 王浩 | A method of comprehensive utilization electric furnace ash produces rock wool board |
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| EP0040870B1 (en) * | 1980-05-13 | 1985-05-08 | Hoogovens Groep B.V. | Process of treating a dust which contains zinc and lead and which is derived from an iron or steel making process |
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2015
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107541575A (en) * | 2016-06-29 | 2018-01-05 | 宝山钢铁股份有限公司 | A kind of blast furnace dedusting ash retracting device and method |
| CN107541575B (en) * | 2016-06-29 | 2019-08-27 | 宝山钢铁股份有限公司 | A kind of blast furnace dedusting ash recyclable device and method |
| CN108178502A (en) * | 2017-12-11 | 2018-06-19 | 鞍钢股份有限公司 | Utilize low iron metallurgical waste and the method for blast furnace cinder production mineral wool and molten iron |
| CN108178502B (en) * | 2017-12-11 | 2020-10-27 | 鞍钢股份有限公司 | Method for producing mineral wool and molten iron by using low-iron metallurgical waste and blast furnace slag |
| CN109942202A (en) * | 2019-04-04 | 2019-06-28 | 王浩 | A method of comprehensive utilization electric furnace ash produces rock wool board |
| CN109942202B (en) * | 2019-04-04 | 2021-12-14 | 马鞍山市弘信冶金材料有限公司 | Method for producing rock wool board by comprehensively utilizing electric furnace ash |
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Application publication date: 20151223 |