CN104878194A - Treatment method for recovering iron from sintered red mud - Google Patents
Treatment method for recovering iron from sintered red mud Download PDFInfo
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- CN104878194A CN104878194A CN201510349929.XA CN201510349929A CN104878194A CN 104878194 A CN104878194 A CN 104878194A CN 201510349929 A CN201510349929 A CN 201510349929A CN 104878194 A CN104878194 A CN 104878194A
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Abstract
The invention belongs to the technical field of comprehensive utilization of solid waste discharged during alumina production by sintering and particularly relates to a treatment method for recovering iron from sintered red mud. The treatment method comprises the concrete steps that firstly, the sintered red mud is filtered, dried, pulverized and stirred to be even, so that well mixed sintered red mud is obtained; afterwards, carbon powder and the well mixed sintered red mud are sequentially subjected to mixing, grinding, roasting, water quenching and static settlement, so that a deposit is obtained; finally, the deposit is ground, water is added to the deposit, ore pulp is obtained through preparation, and the ore pulp is separated through a high-intensity magnetic separator, so that iron ore concentrate and red mud tailings slag are obtained. The treatment method has the advantages that the technology process is simple, energy consumption is low, there is no special requirement for equipment, and industrialization is easy to implement, thereby having important significance for utilization of the solid waste and environmental protection.
Description
Technical field
The invention belongs to the technical field of comprehensive utilization that sintering process produces the solid waste that aluminum oxide discharges, be specifically related to the treatment process reclaiming iron in a kind of red mud from sintering process.
Background technology
The contaminative waste residue of discharging when red mud is Aluminium industry extraction aluminum oxide, often produces one ton of aluminum oxide, incidentally produces 1.0-2.0 ton red mud.Red mud generally in fine particle powder-form, is gained the name because outward appearance is similar to redness of the skin or complexion earth, wherein iron level higher (generally between 5%-15%), and with weak magnetic Fe
2o
3be main, therefore can as the new resources producing iron ore concentrate.Fe in red mud
2o
3recovery be also conducive to the comprehensive utilization of other useful components.At present, the sorting of iron ore mainly adopts magnetic plant to be separated, but the iron in red mud mostly is weak martial ethiops Fe
2o
3even if adopt the higher magnetic separator of magneticstrength to reclaim, still can not reach ideal effect.Add that Steel prices constantly declines in recent years, therefore, under current economic and technical qualification, red mud is carried iron and is difficult to realize industrialization.
The red mud that the whole world produces every year about 9,000 ten thousand tons, red mud comprehensive utilization is global problem, in the world red mud is mainly adopted to the disposal options of storing up earthing.China is as the fourth-largest alumina producing state of the world, and the red mud of annual discharge is up to millions of tons.In recent years, China's red mud comprehensive utilization work obtains the great attention of each side, Ministry of Industry and Information has put into effect " red mud comprehensive utilization instruction " (No. [2010] 401, Ministry of Industry and Information's interlink) for this reason specially, in the notice [send out and change No. (2011) 2919, ring money] of country's " 12 " comprehensive utilization of resources instruction and large solid waste comprehensive utilization embodiment, clearly propose will realize science, efficiency utilization to red mud, and a collection of red mud comprehensive utilization pilot project will be built as one of its priority project.
But a large amount of red muds can not fully effectively utilize, not only occupy a large amount of soil, also serious pollution is caused to environment, so reduce output and the harm of red mud to greatest extent, realize by all kinds of means, the resource utilization of quantity is extremely urgent greatly.In red mud, principal element is iron, silicon, aluminium, calcium, in addition containing the comparatively valuable metal such as vanadium, titanium, scandium, rare earth, is a kind of secondary resource of preciousness.How processing red mud is a problem being worth further investigation, first innoxious, resource utilization and energy should be focused on to the process of mine tailing, recycling inherently save energy and the resource of mine tailing, for tailings glass finds a new way of turning harm into good, turning waste into wealth, realize no waste mine to produce, reduce land seizure, to resource make full use of and the improvement of ecotope significant.
In red mud, other useful components are not usually because wherein fully utilizing containing iron, and therefore, the iron in removing red mud is conducive to the recovery of other components.At present, mainly adopt Chemical Leaching method with the iron that recovery sintering process obtains in red mud, the method not only needs to consume the chemical reagent such as a large amount of soda acids, and the perishable damage equipment of chemical reagent, requires higher to equipment quality.
Summary of the invention
For prior art Problems existing, the object of this invention is to provide the treatment process reclaiming iron in a kind of red mud from sintering process.The present invention adopts the technological method of reducing roasting-magnetic separation, reclaims the iron in red mud from sintering process, and it has environmental friendliness, advantage that the rate of recovery is high.
In order to reach above object, the present invention is achieved by the following technical solutions.
Reclaim a treatment process for iron in red mud from sintering process, it is characterized in that, comprise the following steps:
(1) by red mud from sintering process filtration, drying, grinding, stirring and evenly mixing, the red mud from sintering process mixed is obtained;
(2) red mud from sintering process of mixing is mixed with carbon dust, grinds, obtain mixture;
(3) by quenching in mixture roasting, water, staticly settle, be precipitated thing;
(4) throw out is ground again, obtain the red mud from sintering process after grinding;
(5) red mud from sintering process after grinding is added water and is mixed with ore pulp, use intensity magnetic separator sorting, obtain iron ore concentrate and red mud mine tailings.
Preferably, the mass ratio of described carbon dust and red mud from sintering process is 1:0.5-1:2.
Preferably, in step (2), the described red mud from sintering process by mixing mixes with carbon dust, grinds, and it is ground to: mixture is ground to median size and is less than 0.074mm, and the mixture that its particle diameter is less than 0.074mm accounts for 80-100%.
Preferably, in step (3), described by mixture roasting, its roasting is: under the condition of 600 DEG C-1000 DEG C isolated air, roasting 10-60min.
Preferably, in step (4), described by throw out grinding, it is ground to: throw out is ground to median size and is less than 0.074mm, and the throw out that its particle diameter is less than 0.074mm accounts for 80-100%.
Preferably, in step (5), described by grinding after red mud from sintering process add water, be mixed with ore pulp, its ore pulp mass concentration is 20-40%.
Preferably, in step (5), described intensity magnetic separator sorting, its magnet separator magnetic intensity of field is 6000-10000Gs.
Compared with prior art, the present invention has the following advantages and useful technique effect:
(1) the present invention adopts the technological method of reducing roasting-magnetic separation, improves the ferromegnetism of the ferric oxide in red mud from sintering process, makes weak magnetism Fe
2o
3change epistasis iron Fe into
3o
4, improve the rate of recovery and the concentrate grade of iron in red mud.
(2) the present invention is in use reducing roasting-magnetic separation technology method, iron in red mud from sintering process can be separated without the need to adding the chemical agent such as acid, alkali, being conducive to enrichment and the recovery of the iron in red mud from sintering process, also there is vital role to realizing the comprehensive utilization of other valuable constituents in solid waste red mud.
(3) preparation process of the present invention simple, to equipment without particular requirement and energy consumption low, easily realize the advantages such as industrialization, resource of tailings is utilized and environment protection significant.
(4), in the present invention, the rate of recovery of iron can reach more than 90%.
Accompanying drawing explanation
Fig. 1 is the treatment process process flow sheet reclaiming iron in a kind of red mud from sintering process of the present invention.
Embodiment
In order to understand the present invention better, illustrate content of the present invention further below in conjunction with embodiment, but content of the present invention is not only confined to the following examples.
Embodiment 1
Reclaim the treatment process of iron in a kind of red mud from sintering process of the present invention, its concrete steps are as follows:
(1) by full Iron grade be 21.8% red mud from sintering process filter, to heat in loft drier, dry, then grind, mix, use quartering division, sampling red mud from sintering process sample 50g;
(2) be that 1:0.5 mix with red mud from sintering process sample according to mass ratio by carbon dust, obtain mixture, then mixture is ground to median size is less than 0.074mm, the mixture that its particle diameter is less than 0.074mm accounts for 80-100%;
(3) by mixture under 600 DEG C of conditions, isolated air roasting 20min, after roasting terminates, under the hot conditions of 600 DEG C, puts into rapidly quenching in cold water by the mixture after roasting, obtains cooled red mud sample;
(4) staticly settled by cooled red mud sample, be precipitated thing, then throw out is ground to median size is less than 0.074mm, the throw out that its particle diameter is less than 0.074mm accounts for 80-100%;
(5) the red mud sample after grinding is added water, be mixed with the ore pulp that mass concentration is 20%, under magneticstrength is 6000Gs condition, use High gradient high intensity magnetic separator sorting, obtain iron ore concentrate and red mud mine tailings.
Embodiment 2
Reclaim the treatment process of iron in a kind of red mud from sintering process of the present invention, its concrete steps are as follows:
(1) by full Iron grade be 21.8% red mud from sintering process filter, to heat in loft drier, dry, then grind, mix, use quartering division, sampling red mud from sintering process sample 70g;
(2) be that 1:1 mix with red mud from sintering process sample according to mass ratio by carbon dust, obtain mixture, then mixture is ground to median size is less than 0.074mm, the mixture that its particle diameter is less than 0.074mm accounts for 80-100%;
(3) by mixture under 800 DEG C of conditions, isolated air roasting 30min, after roasting terminates, under the hot conditions of 800 DEG C, puts into rapidly quenching in cold water by the mixture after roasting, obtains cooled red mud sample;
(4) staticly settled by cooled red mud sample, be precipitated thing, then throw out is ground to median size is less than 0.074mm, the throw out that its particle diameter is less than 0.074mm accounts for 80-100%;
(5) the red mud sample after grinding is added water, be mixed with the ore pulp that mass concentration is 30%, under magneticstrength is 8000Gs condition, use High gradient high intensity magnetic separator sorting, obtain iron ore concentrate and red mud mine tailings.
Embodiment 3
Reclaim the treatment process of iron in a kind of red mud from sintering process of the present invention, its concrete steps are as follows:
(1) by full Iron grade be 21.8% red mud from sintering process filter, to heat in loft drier, dry, then grind, mix, use quartering division, sampling red mud from sintering process sample 90g;
(2) be that 1:1 mix with red mud from sintering process sample according to mass ratio by carbon dust, obtain mixture, then mixture is ground to median size is less than 0.074mm, the mixture that its particle diameter is less than 0.074mm accounts for 80-100%;
(3) by mixture under 1000 DEG C of temperature condition, isolated air roasting 40 minutes, after roasting terminates, under 1000 DEG C of hot conditionss, puts into rapidly quenching in cold water by the mixture after roasting, obtains cooled red mud sample;
(4) staticly settled by cooled red mud sample, be precipitated thing, then throw out is ground to median size is less than 0.074mm, the throw out that its particle diameter is less than 0.074mm accounts for 80-100%;
(5) the red mud sample after grinding is added water, be mixed with the ore pulp that mass concentration is 40%, under magneticstrength is 10000Gs condition, use High gradient high intensity magnetic separator sorting, obtain iron ore concentrate and red mud mine tailings.
The treatment process of iron is reclaimed in a kind of red mud from sintering process of the present invention, the iron ore concentrate that embodiment 1, embodiment 2 and embodiment 3 are obtained with High gradient high intensity magnetic separator sorting and red mud mine tailings filter, dry, weigh, and adopt potassium bichromate chemical titration, Iron grade in assay iron ore concentrate and red mud mine tailings, calculate the rate of recovery of iron, as table 1.
The different embodiment reducing roasting of table 1-magnetic separation process reclaims the experimental result of iron in red mud from sintering process
Table 1 is under different embodiments of the invention, with the technological method of reducing roasting-magnetic separation, reclaims the experimental result of iron in red mud from sintering process.It is as shown in the table, and under the method for embodiment 1, the rate of recovery obtaining iron is 92.36%; Under the method for embodiment 2, the rate of recovery obtaining iron is 90.47%; Under the method for embodiment 3, the rate of recovery obtaining iron is 91.52%, it can thus be appreciated that reclaim the treatment process of iron in a kind of red mud from sintering process of the present invention, iron recovery is high, and its technique is simple.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that the specific embodiment of the present invention is only limitted to this.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to the present invention by submitted to claims determination scope of patent protection.
Claims (7)
1. reclaim a treatment process for iron in red mud from sintering process, it is characterized in that, comprise the following steps:
(1) by red mud from sintering process filtration, drying, grinding, stirring and evenly mixing, the red mud from sintering process mixed is obtained;
(2) red mud from sintering process of mixing is mixed with carbon dust, grinds, obtain mixture;
(3) by quenching in mixture roasting, water, staticly settle, be precipitated thing;
(4) throw out is ground, obtain the red mud from sintering process after grinding;
(5) red mud from sintering process after grinding is added water, is mixed with ore pulp, use intensity magnetic separator sorting, obtain iron ore concentrate and red mud mine tailings.
2. the method reclaiming iron from red mud from sintering process according to claim 1, is characterized in that, the mass ratio of described carbon dust and red mud from sintering process is 1:0.5-1:2.
3. the method reclaiming iron from red mud from sintering process according to claim 1, it is characterized in that, in step (2), the described red mud from sintering process by mixing mixes with carbon dust, grinds, it is ground to: mixture is ground to median size and is less than 0.074mm, and the mixture that its particle diameter is less than 0.074mm accounts for 80-100%.
4. the method reclaiming iron from red mud from sintering process according to claim 1, is characterized in that, in step (3), described by mixture roasting, its roasting is: under the condition of 600 DEG C-1000 DEG C isolated air, roasting 10-60min.
5. the method reclaiming iron from red mud from sintering process according to claim 1, it is characterized in that, in step (4), described throw out to be ground, it is ground to: throw out is ground to median size and is less than 0.074mm, and the throw out that its particle diameter is less than 0.074mm accounts for 80-100%.
6. the method reclaiming iron from red mud from sintering process according to claim 1, is characterized in that, in step (5), described by grinding after red mud from sintering process add water, be mixed with ore pulp, its ore pulp mass concentration is 20-40%.
7. the method reclaiming iron from red mud from sintering process according to claim 1, is characterized in that, in step (5), described intensity magnetic separator sorting, its magnet separator magnetic intensity of field is 6000-10000Gs.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105174295A (en) * | 2015-10-15 | 2015-12-23 | 北京荣富鑫环保科技有限公司 | Dry-process electric-separation governing system for red mud |
| CN107254583A (en) * | 2017-06-09 | 2017-10-17 | 张建华 | One kind is based on the red mud method of comprehensive utilization of rotary kiln for directly reducing roasting-magnetic separation |
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| CN1743472A (en) * | 2005-09-22 | 2006-03-08 | 贵阳铝镁设计研究院 | Method for recovering iron from red mud |
| CN102626670A (en) * | 2012-04-28 | 2012-08-08 | 北京科技大学 | Method for preparing high purity iron ore by reducing and magnetizing red mud in rotary kiln |
| CN103276193A (en) * | 2013-06-21 | 2013-09-04 | 山东鲁铭高温材料科技有限公司 | Method and device for preparing powdered iron through magnetizing low-iron red mud |
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Patent Citations (3)
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| CN1743472A (en) * | 2005-09-22 | 2006-03-08 | 贵阳铝镁设计研究院 | Method for recovering iron from red mud |
| CN102626670A (en) * | 2012-04-28 | 2012-08-08 | 北京科技大学 | Method for preparing high purity iron ore by reducing and magnetizing red mud in rotary kiln |
| CN103276193A (en) * | 2013-06-21 | 2013-09-04 | 山东鲁铭高温材料科技有限公司 | Method and device for preparing powdered iron through magnetizing low-iron red mud |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105174295A (en) * | 2015-10-15 | 2015-12-23 | 北京荣富鑫环保科技有限公司 | Dry-process electric-separation governing system for red mud |
| CN107254583A (en) * | 2017-06-09 | 2017-10-17 | 张建华 | One kind is based on the red mud method of comprehensive utilization of rotary kiln for directly reducing roasting-magnetic separation |
| CN107254583B (en) * | 2017-06-09 | 2018-09-28 | 张建华 | One kind being based on the red mud method of comprehensive utilization of rotary kiln for directly reducing roasting-magnetic separation |
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Application publication date: 20150902 |