CN103074456A - Method for recycling iron from waste red mud in alumina production - Google Patents
Method for recycling iron from waste red mud in alumina production Download PDFInfo
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- CN103074456A CN103074456A CN2013100060012A CN201310006001A CN103074456A CN 103074456 A CN103074456 A CN 103074456A CN 2013100060012 A CN2013100060012 A CN 2013100060012A CN 201310006001 A CN201310006001 A CN 201310006001A CN 103074456 A CN103074456 A CN 103074456A
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Abstract
The invention relates to a method for recycling iron from waste red mud in alumina production. The method is characterized in that waste red mud in alumina production is dried, the moisture content after drying ranges from 1% to 10%, the particle size of the smashed red mud is less than or equal to 0.15mm, and the red mud is manufactured into pellets of 15mm to 50mm under the pressure ranging from 10kN to 70kN. Heat produced by blast furnace gas burning is used to dry the red mud pellets to be with a moisture content less than or equal to 1%, then the dried red mud pallets, coke, limestone and dolomite are mixed according to the proportion and added into a blast furnace to be smelted directly, finally the mixture is separated through iron slag to obtain metallic iron and slag, iron can directly serve as a steel-making material, and the slag can be recycled for subsequent comprehensive utilization. According to the method, industrial waste serves as a main material, environmental pollution is reduced, and the waste can be recycled; and the method has the advantages that the quality of the recycled iron is good, the iron recovery rate is high and can achieve more than 98%, the technological process is simple, the production is easily achieved, and tailings after iron removal are easily processed.
Description
Technical field
The invention belongs to alumina producing red mud treatment process technical field, be specifically related to a kind of processing method that directly from diaspore Bayer process alumina producing solid waste red mud, directly reclaims valuable metal iron.
Background technology
In the diaspore Bayer process alumina producing, bauxite and lime, circulation alkali liquor mixer mill carry out stripping after making qualified ore pulp, and under high temperature, High Pressure, the aluminum oxide in the ore enters solution, and its insolubles is red mud.Ore pulp is through dilution, after the sedimentation solid-liquid separation after the stripping, and the underflow red mud slurry of generation effluxes behind three counter flow washings, the attached alkali of filtered and recycled.Produce l ton aluminum oxide and can produce 1.1～1.5 tons of red muds, along with the in recent years fast development of aluminum oxide industry, nearly 100,000,000 tons of global annual aluminum oxide output, only China's aluminum oxide output in 2011 just reaches 3,780 ten thousand tons, approximately 5,000 ten thousand tons of red mud quantity dischargeds.At present a large amount of red mud is that the method that adopts ocean disposal and land to store up is disposed in the world, has taken a large amount of soils.The stacking red mud can cause the alkalization of soil, polluted underground water, serious environment pollution.Particularly 2010, Hungary's red mud dam break has occured polluted after the accident of Danube, caused especially the whole world showing great attention to the red mud problem.Along with the pay attention to day by day of the whole world to the red mud environmental issue, iron red mud is carried out the development and use of harmless treatment and resource utilization more and more important.
The high ferro Bayer red mud will fully utilize red mud because the iron level in the red mud is high, will reclaim at first exactly the iron in the red mud.Having done many work aspect the research of iron both at home and abroad in reclaiming red mud at present, mainly is red mud directly to be carried out magnetic separation, flotation, gravity treatment and combined process flow thereof extract iron ore concentrate, although flow process is simple, its effect is all undesirable, to Fe
2O
3The rate of recovery also do not reach 20%, the Fe in the red mud
2O
3Content is still 32～34%, and the overall reduction of red mud approximately 10% does not have substantial change to red mud pilling, and follow-up comprehensive utilization is not improved yet.
Technological line from recovering iron from red mud is magnetizing roasting magnetic separation iron in addition, and the CN102626670A patent is improved method of reducing, and the composition by control reduction temperature and reducing gas changes the weak magnetic substance in the red mud into Fe as far as possible
3O
4, then by magnetic separation, realize the recovery of the ferro element in the red mud.But because iron wraps up with other mineral in red mud or is mingled with, there is iron concentrate grade low (～63%), the problems such as the rate of recovery of iron low (～90%), be unfavorable for the comprehensive utilization of tailings, simultaneously because producer gas or blast furnace gas and the kiln tail gas gas mixture equipment that need to need by the coal gas composition of strict control.
The method of deoxy iron-smelting is mainly taked electric furnace process from red mud, and the method exists electric furnace ironmaking thermo-efficiency lower, the shortcoming that power consumption is large.
Summary of the invention
The object of the present invention is to provide processing method a kind of and the red mud ironmaking that diaspore Bayer process process for making alumina is supporting, directly directly carrying out blast furnace ironmaking from the solid waste red mud of Bayer process alumina producing obtains metallic iron, have that technical process is simple, operation is ripe, produce the characteristics that easily realize.
The technical scheme that the present invention takes is:
A kind of method that from the alumina producing waste red mud, reclaims iron, it is characterized in that: the alumina producing solid waste red mud is through super-dry, ball processed, oven dry, then dried red mud ball, coke, Wingdale, rhombspar are mixed in proportion, add in the blast furnace and smelt iron, separate obtaining metallic iron and slag by scum.Iron can directly be taken out, and slag reclaims and carries out follow-up comprehensive utilization.
Red mud slurry by after the pressure filter dehydration, behind seasoning or drier, is obtained moisture 1%～10% red mud.
Dried red mud is broken, and granularity≤0.15mm makes the pelletizing of 15～50mm under the pressure of 10～70kN.
After the pelletizing process drying machine drying, moisture content≤1%; Become 300～400 ℃ hot blast after the hot flue gas that the thermal source of drying machine produces from blast furnace gas combustion and the air mixed.
Red mud pelletizing and Wingdale, rhombspar, coke are entered blast-furnace smelting, separate obtaining the pig iron and slag by scum; Main technologic parameters is: the shared weight percent of each component of blast-furnace smelting is: red mud 30～80%, coke 20～30%, Wingdale 0～10%, rhombspar 0～10%; The blast-furnace smelting hot blast temperature is 450～1100 ℃, and smelting temperature is 1500～1650 ℃ in the stove, and slag iron tapping temperature is higher than 1400 ℃.
The present invention specifically realizes by following steps:
Step 1 by after the pressure filter dehydration, behind seasoning or drier, obtains moisture 1%～10% red mud with red mud slurry, and red mud is through after the fragmentation, and granularity≤0.15mm makes the pelletizing of 15～50mm under the pressure of 10～70kN.Become 300～400 ℃ hot blast after the hot flue gas that the thermal source blast furnace gas combustion of dryer produces and the air mixed.
Step 2, after the pelletizing process drying machine drying, moisture content≤1%.Become 300～400 ℃ hot blast after the hot flue gas that the drying machine thermal source produces from blast furnace gas combustion and the air mixed.
Step 3 enters blast-furnace smelting with red mud pelletizing and Wingdale, rhombspar, coke, separates obtaining the pig iron and slag by scum.
Main technologic parameters is: the shared weight percent of each component of blast-furnace smelting is: red mud 30～80%, coke 20～30%, Wingdale 0～10%, rhombspar 0～10%.The blast-furnace smelting hot blast temperature is 450～1100 ℃, and smelting temperature is 1500～1650 ℃ in the stove, and slag iron tapping temperature is higher than 1400 ℃.
The present invention has following advantage:
1) the present invention as the raw material of smelting iron, reclaims the solid waste red mud of alumina producing to iron, and the rate of recovery of iron is up to more than 98%, and its iron quality is good;
2) the present invention adopts low calcium Charging stock recipe, and slag amount has reduced 35～40%.Slag after the ironmaking, valuable metal have all carried out enrichment, for condition has been created in comprehensive utilization;
3) the present invention is take industrial waste as main raw material, and technique is simple, produces easily and realizes, the tailings amount is few and be easy to disposal, not only reduces environmental pollution, and waste material can reuse, and has significant economic and social benefit.
Description of drawings
Fig. 1: alumina producing solid waste red mud iron-smelting process schema.
Embodiment
Embodiment 1
The solid waste red mud of alumina producing is through super-dry, dried red mud is broken, granularity≤0.15mm, moisture content 1-2%, make 50 red mud pelletizing through 10kN pressure, utilize the tail gas of blast furnace ironmaking that the red mud ball is dried to moisture content≤1%, dry red mud ball and coke, Wingdale, rhombspar carries out proportioning in following ratio: red mud 60kg, coke 30kg, Wingdale 5kg, rhombspar 3kg, directly be added in the blast furnace, simultaneously by gas blower air blast in the blast furnace, this wind is through hotblast stove, with air heating to 450 ℃, make the smelting temperature in the blast furnace reach 1500～1650 ℃, 1400～1450 ℃ of slag iron tapping temperatures, the commodity pig iron that obtains, slag will carry out follow-up comprehensive utilization.
After testing, resulting metallic iron quality is better, wherein Fe:94.164%, C:3.86%, Si:0.36%, Mn:0.11%, P:0.025%, S:0.054%.
The analytical results of slag is: Fe
2O
3: 1.08%, TiO
2: 8.40%, CaO:29.99%, SiO
2: 18.01%, Al
2O
3: 26.31%, Na
2O:6.07%, MgO:1.05%.
Embodiment 2, the solid waste red mud of alumina producing is through super-dry, moisture content 9-10%, dried red mud is broken, granularity≤0.15mm, make 30 red mud pelletizing through 50kN pressure, utilize the tail gas of blast furnace ironmaking that the red mud ball is dried to moisture content≤1%, dry red mud ball and coke, Wingdale, rhombspar carries out proportioning in following ratio: red mud 80kg, coke 20kg, rhombspar 10kg directly is added in the blast furnace, simultaneously by gas blower air blast in the blast furnace, this wind is through hotblast stove, with air heating to 1100 ℃, makes the smelting temperature in the blast furnace reach 1500～1650 ℃, 1400～1480 ℃ of slag iron tapping temperatures, slag will carry out follow-up comprehensive utilization.
After testing, resulting metallic iron quality is better, wherein Fe:94.164%, C:3.82%, Si:0.41%, Mn:0.41%, P:0.087%, S:0.052%.
The analytical results of slag is: Fe
2O
3: 0.83%, TiO
2: 6.32%, CaO:22.67%, SiO
2: 17.42%, Al
2O
3: 26.25%, Na
2O:6.00%.
Embodiment 3, the solid waste red mud of alumina producing is through super-dry, moisture content 5-6%, dried red mud is broken, granularity≤0.15mm, make 15 red mud pelletizing through 70kN pressure, utilize the tail gas of blast furnace ironmaking that the red mud ball is dried to moisture content≤1%, dry red mud ball and coke, Wingdale, the rhombspar iron ore carries out proportioning in following ratio: red mud 30kg, coke 25kg, iron ore 40kg, Wingdale 10kg, directly be added in the blast furnace, simultaneously by gas blower air blast in the blast furnace, this wind is through hotblast stove, with air heating to 800 ℃, make the smelting temperature in the blast furnace reach 1500～1650 ℃, 1400～1450 ℃ of slag iron tapping temperatures, slag will carry out follow-up comprehensive utilization.
After testing, resulting metallic iron quality is better, wherein Fe:94.98%, C:3.82%, Si:0.25%, Mn:0.65%, P:0.065%, S:0.032%.
The analytical results of slag is: Fe
2O
3: 0.83%, TiO
2: 4.32%, CaO:20.67%, SiO
2: 19.42%, Al
2O
3: 28.25%, Na
2O:3.00%, MgO:1.5%.
Claims (5)
1. method that from the alumina producing waste red mud, reclaims iron, it is characterized in that: the alumina producing solid waste red mud is through super-dry, ball processed, oven dry, then dried red mud ball, coke, Wingdale, rhombspar are mixed in proportion, add in the blast furnace and smelt iron, separate obtaining metallic iron and slag by scum.
2. the method from recovering iron from red mud according to claim 1 is characterized in that: after red mud slurry is dewatered by pressure filter, behind seasoning or drier, obtain moisture 1%～10% red mud.
3. the method from recovering iron from red mud according to claim 1 and 2 is characterized in that: dried red mud is broken, and granularity≤0.15mm makes the pelletizing of 15～50mm under the pressure of 10～70kN.
4. according to claim 1 or 3 described methods from recovering iron from red mud, it is characterized in that: pelletizing through the drying machine drying after, moisture content≤1%; Become 300～400 ℃ hot blast after the hot flue gas that the thermal source of drying machine produces from blast furnace gas combustion and the air mixed.
5. the method from recovering iron from red mud according to claim 1 is characterized in that: red mud pelletizing and Wingdale, rhombspar, coke are entered blast-furnace smelting, separate obtaining the pig iron and slag by scum; Main technologic parameters is: the shared weight percent of each component of blast-furnace smelting is: red mud 30～80%, coke 20～30%, Wingdale 0～10%, rhombspar 0～10%; The blast-furnace smelting hot blast temperature is 450～1100 ℃, and smelting temperature is 1500～1650 ℃ in the stove, and slag iron tapping temperature is higher than 1400 ℃.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103589872A (en) * | 2013-11-18 | 2014-02-19 | 中国铝业股份有限公司 | Method for recovering titanium from red mud slag |
| CN103589871A (en) * | 2013-11-18 | 2014-02-19 | 中国铝业股份有限公司 | Method for recovering aluminum from red mud slag |
| CN103588235A (en) * | 2013-11-18 | 2014-02-19 | 中国铝业股份有限公司 | Method for producing polyaluminium sulfate by using red mud slag |
| CN103667728A (en) * | 2013-12-10 | 2014-03-26 | 中国铝业股份有限公司 | Method for recycling scandium from red mud slag |
| CN104988322A (en) * | 2015-08-04 | 2015-10-21 | 江苏省冶金设计院有限公司 | Comprehensive processing method of red mud and acetylene sludge |
| CN105710105A (en) * | 2016-01-13 | 2016-06-29 | 河南城建学院 | Integrated preparing method for separating iron through red mud and foaming light wall material through tailings base of red mud |
| CN107083485A (en) * | 2017-04-28 | 2017-08-22 | 东北大学 | A kind of method of comprehensive utilization of alumina laterite |
| CN107760862A (en) * | 2017-10-19 | 2018-03-06 | 东北大学 | A kind of method from recovering iron from red mud |
| CN110172538A (en) * | 2019-06-27 | 2019-08-27 | 深圳前海中能再生资源有限公司 | A kind of red mud high-efficiency resource recycling system and technique |
| CN112981028A (en) * | 2021-04-23 | 2021-06-18 | 中国恩菲工程技术有限公司 | Method for extracting iron element from red mud |
| CN113651525A (en) * | 2021-09-03 | 2021-11-16 | 中国铝业股份有限公司 | Rock wool and preparation method and preparation device thereof |
| CN113913609A (en) * | 2021-09-25 | 2022-01-11 | 北京赤钢路桥科技有限公司 | Manufacturing method for directly replacing iron ore by hardening red mud into balls |
| CN115109885A (en) * | 2022-07-06 | 2022-09-27 | 湖北理工学院 | Microwave coreduction of gas ash and Bayer process red mud to prepare iron-silicon alloy and separate Al 2 O 3 Method (2) |
| CN116479236A (en) * | 2023-03-15 | 2023-07-25 | 靖西天桂铝业有限公司 | Method for preparing steelmaking fluoride-free slag melting agent from tailings mud and high-iron Bayer process red mud |
| CN116479236B (en) * | 2023-03-15 | 2024-05-31 | 靖西天桂铝业有限公司 | Method for preparing steelmaking fluoride-free slag melting agent from tailings mud and high-iron Bayer process red mud |
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Cited By (21)
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| CN103589872B (en) * | 2013-11-18 | 2016-07-06 | 中国铝业股份有限公司 | The method of recovery Pd from red mud slag |
| CN103589871A (en) * | 2013-11-18 | 2014-02-19 | 中国铝业股份有限公司 | Method for recovering aluminum from red mud slag |
| CN103588235A (en) * | 2013-11-18 | 2014-02-19 | 中国铝业股份有限公司 | Method for producing polyaluminium sulfate by using red mud slag |
| CN103588235B (en) * | 2013-11-18 | 2015-02-25 | 中国铝业股份有限公司 | Method for producing polyaluminium sulfate by using red mud slag |
| CN103589872A (en) * | 2013-11-18 | 2014-02-19 | 中国铝业股份有限公司 | Method for recovering titanium from red mud slag |
| CN103589871B (en) * | 2013-11-18 | 2016-06-29 | 中国铝业股份有限公司 | The method reclaiming aluminum from red mud slag |
| CN103667728A (en) * | 2013-12-10 | 2014-03-26 | 中国铝业股份有限公司 | Method for recycling scandium from red mud slag |
| CN104988322A (en) * | 2015-08-04 | 2015-10-21 | 江苏省冶金设计院有限公司 | Comprehensive processing method of red mud and acetylene sludge |
| CN105710105B (en) * | 2016-01-13 | 2018-01-05 | 河南城建学院 | A kind of red mud selects the integral preparation method of iron and its tailings base foamed light walling |
| CN105710105A (en) * | 2016-01-13 | 2016-06-29 | 河南城建学院 | Integrated preparing method for separating iron through red mud and foaming light wall material through tailings base of red mud |
| CN107083485A (en) * | 2017-04-28 | 2017-08-22 | 东北大学 | A kind of method of comprehensive utilization of alumina laterite |
| CN107083485B (en) * | 2017-04-28 | 2018-09-07 | 东北大学 | A kind of method of comprehensive utilization of alumina laterite |
| CN107760862A (en) * | 2017-10-19 | 2018-03-06 | 东北大学 | A kind of method from recovering iron from red mud |
| CN110172538A (en) * | 2019-06-27 | 2019-08-27 | 深圳前海中能再生资源有限公司 | A kind of red mud high-efficiency resource recycling system and technique |
| CN112981028A (en) * | 2021-04-23 | 2021-06-18 | 中国恩菲工程技术有限公司 | Method for extracting iron element from red mud |
| CN112981028B (en) * | 2021-04-23 | 2021-08-31 | 中国恩菲工程技术有限公司 | Method for extracting iron element from red mud |
| CN113651525A (en) * | 2021-09-03 | 2021-11-16 | 中国铝业股份有限公司 | Rock wool and preparation method and preparation device thereof |
| CN113913609A (en) * | 2021-09-25 | 2022-01-11 | 北京赤钢路桥科技有限公司 | Manufacturing method for directly replacing iron ore by hardening red mud into balls |
| CN115109885A (en) * | 2022-07-06 | 2022-09-27 | 湖北理工学院 | Microwave coreduction of gas ash and Bayer process red mud to prepare iron-silicon alloy and separate Al 2 O 3 Method (2) |
| CN116479236A (en) * | 2023-03-15 | 2023-07-25 | 靖西天桂铝业有限公司 | Method for preparing steelmaking fluoride-free slag melting agent from tailings mud and high-iron Bayer process red mud |
| CN116479236B (en) * | 2023-03-15 | 2024-05-31 | 靖西天桂铝业有限公司 | Method for preparing steelmaking fluoride-free slag melting agent from tailings mud and high-iron Bayer process red mud |
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Application publication date: 20130501 |