CN105522160A - Preparation method for reduced iron powder - Google Patents
Preparation method for reduced iron powder Download PDFInfo
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- CN105522160A CN105522160A CN201510920340.0A CN201510920340A CN105522160A CN 105522160 A CN105522160 A CN 105522160A CN 201510920340 A CN201510920340 A CN 201510920340A CN 105522160 A CN105522160 A CN 105522160A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
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Abstract
The invention discloses a preparation method for reduced iron powder, and belongs to the field of resource comprehensive utilization. According to the preparation method, Bayer process red mud, steel slag and iron tailing preconcentration iron ore concentrates serve as raw materials, the Bayer process red mud and the steel slag are used in cooperation to reduce the iron tailing preconcentration iron ore concentrates, iron in the iron tailing preconcentration iron ore concentrates, the Bayer process red mud and the steel slag is recycled, and the reduced iron powder is prepared. The preparation method includes the steps of Bayer process red mud and steel slag pretreatment, preparation of green pellets, high temperature reduction, wet process ore grinding and wet process magnetic separation. According to the preparation method, the Bayer process red mud discharged from an aluminum oxide extraction plant and the steel slag discharged from a steelmaking plant are used in cooperation to reduce the preconcentration iron ore concentrates obtained through tailing preconcentration in a strengthening manner; meanwhile, comprehensive utilization of three solid waste iron resources is achieved; and no other industrial grade or chemical pure additives need to be added in the reduction process so that the reduction cost can be obviously reduced.
Description
Technical field
The invention belongs to comprehensive utilization of resources field, particularly relate to a kind of preparation method of reduced iron powder.
Background technology
China's iron ore deposit enriches, and exploits for many years and have accumulated a large amount of iron tailings.The storing up and process the very severe stubborn problem becoming bargh and face of iron tailings.Such as, Qidashan iron ore is the main force mine of Anshan iron and steel plant group, and neat mountain Tailings Dam has been accumulated and piled up iron tailings more than 200,000,000 ton, and this kind of mine tailing has in other areas of China and distributes widely.The early stage Iron grade of neat mountain mine tailing can reach about 20%, and average grade, also 10% ~ 12%, has huge potential recovery value.
At present, in prior art, the preenrichment technology of iron tailings is mainly comprised: wet milling is separated two steps with magnetic separation, specifically: first wet milling is carried out to iron tailings, make useful iron mineral and gangue mineral monomer dissociation; Then wet magnetic separation is carried out to the ore pulp after mill, obtain the concentrate and tailings after preenrichment.For being different from high-grade iron ore concentrate or Iron concentrate, be that the concentrate product of 35% ~ 45% is called " iron tailings preenrichment iron ore concentrate " by the Iron grade after preenrichment.
Direct-reduction is carried out to iron tailings preenrichment concentrate, needs to add a large amount of additives, as the reduction of the strengthening iron minerals such as calcium oxide, calcium hydroxide, sodium carbonate.A large amount of additives not only increases reduction cost, but also can reduce the Iron grade of mixed material, adds energy consumption.
Red mud is the solid waste of discharging in alundum (Al2O3) production process, has strong basicity.At present, the production method of alundum (Al2O3) mainly contains Bayer process, sintering process and combination method three kinds.According to statistics, within 2011, China's red mud accumulation volume of cargo in storage is about 2.79 hundred million tons, wherein about 50% adopts Bayer process to produce.Red mud is stored up in a large number and can be caused severe contamination to the water body, soil, air etc. of periphery, and takies a large amount of soil.What Bayer process smelted alundum (Al2O3) employing is highly basic NaOH stripping high alumina, high ferro, boehmite type and gibbsitic bauxite, and therefore, the Bayer process red mud of discharge has the advantages that iron content is high, basicity is high, alundum (Al2O3) content is high.Iron method in current recovery high ferro Bayer process red mud is a lot, but comparatively effective method is direct-reduction process.Identical with the technology that iron tailings preenrichment concentrate carries out direct-reduction, for the Bayer process red mud of strengthening reduction high Fe content, need to add a certain amount of alkalinity additive as calcium oxide, calcium hydroxide, calcirm-fluoride, sodium carbonate, not only increase reduction cost, but also the Iron grade of mixed material can be reduced, add energy consumption.
In steelmaking process, can produce a large amount of slags, its output accounts for 15% ~ 20% of output of steel.Storing up of slag not only takies a large amount of soil, and can cause certain environmental pollution.Although slag has reclaimed part coarse grain iron through broken with magnetic separation process before steel mill discharge, still have particulate iron to remain in slag, particularly had the iron that considerable part cannot reclaim with magnetic separator, as being present in various thing middle ferrous iron, ferric iron mutually; And also there is the beneficiating ingredients such as residual steel, calcium oxide, magnesia, manganese oxide and iron oxide in slag.
Known, strengthening reduced iron mine tailing preenrichment iron ore concentrate and high ferro Bayer process red mud all will add a certain amount of strong basicity additive, and the composition in slag determines the feature that it just in time has high alkalinity and can be used as flux.In addition, high ferro Bayer process red mud also has can the composition sodium oxide molybdena of acceleration of sintering and alundum (Al2O3), and the sodium oxide molybdena in high ferro Bayer process red mud also can strengthen the reduction of iron mineral.Therefore, the feature that Bayer process red mud and slag have separately if can make full use of, cooperative reinforcing reduced iron mine tailing preenrichment iron ore concentrate, then can reduce reduction cost, realizes the problem of the iron resource comprehensive utilization of three kinds of solid waste simultaneously.
Summary of the invention
The present invention is exactly the high alkalinity slag collaborative SCM iron tailings preenrichment iron ore concentrate that will utilize high ferro Bayer process red mud and the steel mill discharge of producing alundum (Al2O3) discharge, and do not use technical grade or the chemical pure additives such as calcium oxide, sodium carbonate, calcium hydroxide, to reach the effect reducing reduction cost.Simultaneously, adopt Bayer process red mud and slag cooperative reinforcing reduced iron mine tailing preenrichment iron ore concentrate, remainder fe in iron not only in recyclable iron tailings preenrichment iron ore concentrate but also recyclable Bayer process red mud and slag, achieves the problem of the iron resource comprehensive utilization of three kinds of solid waste simultaneously.
The present invention is achieved by the following technical solutions:
A kind of preparation method of reduced iron powder, described preparation method with Bayer process red mud, slag and iron tailings preenrichment iron ore concentrate for raw material, adopt iron tailings preenrichment concentrate described in described Bayer process red mud and described slag collaborative SCM, to reclaim the iron in described iron tailings preenrichment iron ore concentrate, described Bayer process red mud and described slag, prepare reduced iron powder.
Further, described preparation method comprises Bayer process red mud and pretreatment of slag, the preparation of green pellets, high temperature reduction and wet milling and wet magnetic separation step.
Further, the binding agent added in the preparation process of described green pellets is organic compound class, described preparation method specifically:
(1) Bayer process red mud and pretreatment of slag: dry 24-30 hour under described Bayer process red mud and described slag are placed in the temperature of 95 DEG C-115 DEG C respectively, then carry out fragmentation, after broken, the granularity of described Bayer process red mud and described slag is all less than 1mm;
(2) preparation of green pellets: by weight, get described iron tailings preenrichment iron ore concentrate 100 parts, step (1) pretreated Bayer process red mud 5-20 part, step (1) pretreated slag 15-20 part, then reducing agent and organic compound class binding agent is added, mix, add 5-10 part water again to mix, obtain described green pellets with the compacting of pressure ball equipment;
(3) high temperature reduction: dried by step (2) described green pellets, then puts into reducing atmosphere stove by described green pellets and carries out high temperature reduction, after high temperature reduction terminates, is taken out by pelletizing after roasting and carries out nature cooling or water-cooled, obtain agglomerates; The condition of described high temperature reduction is: temperature 1300 DEG C ~ 1350 DEG C, time 30min ~ 50min;
(4) wet milling and wet magnetic separation: the described agglomerates that step (3) obtains is carried out fragmentation, obtains the particle that fineness is-2mm grade, then described particle is carried out secondary grinding two stages of magnetic separation, obtains the reduced iron powder of Iron grade >=88%.
Further, described in step (1), Bayer process red mud contains the component of following weight percents: full iron 20% ~ 45%, aluminium oxide 10% ~ 20%, silica 5% ~ 15%, calcium oxide 1% ~ 15% and sodium oxide molybdena 3% ~ 9%;
Described in step (1), slag contains the component of following weight percents: full iron 5% ~ 25%, alundum (Al2O3) 1% ~ 8%, silica 1 0% ~ 15%, calcium oxide 35% ~ 60% and magnesia 3% ~ 13%.
Further, described in step (2), iron tailings preenrichment iron ore concentrate contains the component of following weight percents: full iron 35% ~ 50%, silica 25% ~ 45% and content lower than 6% oxide; Described oxide comprises alundum (Al2O3), calcium oxide and magnesia.
Further, described in step (2), the addition of reducing agent is 15% ~ 35%, described reducing agent is any one or two kinds in bituminous coal, anthracite, content >=50% of fixed carbon in described reducing agent, and ash content < 20% in described reducing agent; Described reducing agent addition refer to the quality of reducing agent divided by the quality of red mud, slag and iron tailings preenrichment iron ore concentrate three and mass percent.
Further, the described binding agent added in step (2) is syrup or sodium carboxymethylcellulose; When described binding agent is syrup, the addition 5% ~ 10% of described syrup; When described binding agent is sodium carboxymethylcellulose, the addition of described sodium carboxymethylcellulose is 0.3% ~ 0.5%; Described syrup or refer to the addition of sodium carboxymethylcellulose refer to syrup or refer to the quality of sodium carboxymethylcellulose divided by the quality of red mud, slag and iron tailings preenrichment iron ore concentrate three and mass percent.
Further, described in step (4), secondary grinding two stages of magnetic separation is specially: carry out primary grinding and a stages of magnetic separation first sequentially, then sequentially to carrying out secondary grinding and two stages of magnetic separation; The pulp density of described primary grinding is 50% ~ 60%, and mog is-0.074mm grain size content >=80%; The magnetic field intensity of a described stages of magnetic separation is 150Ak/m ~ 180Ak/m; The pulp density of described secondary grinding is 40% ~ 55%, and mog is-0.074mm grain size content >=90% and-0.038mm grain size content >=85%, and described two stages of magnetic separation magnetic field intensities are 60Ak/m ~ 80Ak/m.
Advantageous Effects of the present invention:
(1) most of metallic iron, ferrous iron and ferric iron in the iron not only in recyclable iron tailings preenrichment iron ore concentrate but also recyclable Bayer process red mud major part ferric iron and slag, achieve the problem of the iron resource comprehensive utilization of three kinds of solid waste simultaneously;
(2) with Bayer process red mud and slag cooperative reinforcing reduced iron mine tailing preenrichment iron ore concentrate, do not need to add other any technical grades in addition or chemical pure additive such as calcium oxide, calcium hydroxide etc. can obviously reduce reduction cost; In addition, Bayer process red mud also has can the composition sodium oxide molybdena of acceleration of sintering and alundum (Al2O3), and wherein sodium oxide molybdena also can strengthen the reduction of iron mineral;
(3) without inorganic compounds such as bentonites as binding agent, the gangue content of pelletizing can be reduced, binding agent used is organic compound, and organic matter burns under high temperature reducing conditions can generate the reducing atmosphere such as carbon monoxide, hydrogen, promotes the reduction of Pellet Iron Ore thing;
(4) the reduced iron powder Iron grade obtained is greater than 88%, can be used as the raw material of electric furnace steel making.
Accompanying drawing explanation
Fig. 1 is the process chart of the preparation method of a kind of reduced iron powder of the present invention;
Fig. 2 is the flow chart of steps of the preparation method of a kind of reduced iron powder of the present invention.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is explained in further detail.Should be appreciated that specific embodiment described herein only for explaining the present invention, being not intended to limit the present invention.
On the contrary, the present invention is contained any by the substituting of making on marrow of the present invention and scope of defining of claim, amendment, equivalent method and scheme.Further, in order to make the public have a better understanding to the present invention, in hereafter details of the present invention being described, detailedly describe some specific detail sections.Do not have the description of these detail sections can understand the present invention completely for a person skilled in the art yet.
embodiment 1
A kind of preparation method of reduced iron powder, described preparation method with Bayer process red mud, slag and iron tailings preenrichment iron ore concentrate for raw material, adopt iron tailings preenrichment concentrate described in described Bayer process red mud and described slag collaborative SCM, to reclaim the iron in described iron tailings preenrichment iron ore concentrate, described Bayer process red mud and described slag, prepare reduced iron powder; Described preparation method's iron recovery >=80%; Most of metallic iron, ferrous iron and ferric iron in the iron of method provided by the present invention not only in recyclable iron tailings preenrichment iron ore concentrate but also recyclable Bayer process red mud major part ferric iron and slag, achieve the problem of the iron resource comprehensive utilization of three kinds of solid waste simultaneously.
Iron tailings preenrichment iron ore concentrate of the present invention is by preparing the preenrichment technology of iron tailings, the described preenrichment technology to iron tailings mainly comprises: wet milling is separated two steps with magnetic separation, specifically: first wet milling is carried out to iron tailings, useful iron mineral and gangue mineral monomer dissociation is made; Then to mill after ore pulp carry out wet magnetic separation, after obtaining preenrichment Iron grade be 35% ~ 45% concentrate product be called " iron tailings preenrichment iron ore concentrate ".
Described preparation method comprises Bayer process red mud and pretreatment of slag, the preparation of green pellets, high temperature reduction and wet milling and wet magnetic separation step.
Described preparation method is specifically:
(1) Bayer process red mud and pretreatment of slag: dry 24-30 hour under described Bayer process red mud and described slag are placed in the temperature of 95 DEG C respectively, then broken, after broken, the granularity of Bayer process red mud and slag is all less than 1mm;
Described Bayer process red mud contains the component of following weight percents: full iron 20% ~ 45%, aluminium oxide 10% ~ 20%, silica 5% ~ 15%, calcium oxide 1% ~ 15% and sodium oxide molybdena 3% ~ 9%;
Described slag contains the component of following weight percents: full iron 5% ~ 25%, alundum (Al2O3) 1% ~ 8%, silica 1 0% ~ 15%, calcium oxide 35% ~ 60% and magnesia 3% ~ 13%;
(2) preparation of green pellets: by weight, get described iron tailings preenrichment iron ore concentrate 100 parts, step (1) pretreated Bayer process red mud 5-20 part, step (1) pretreated slag 15-20 part, then add reducing agent and binding agent and mix obtaining mixed material; In described mixed material, add 5-10 part water again mix, then obtain described green pellets with the compacting of pressure ball equipment;
With Bayer process red mud and slag cooperative reinforcing reduced iron mine tailing preenrichment iron ore concentrate, do not need to add other any technical grades or chemical pure additive (as calcium oxide, calcium hydroxide etc.) in addition, can obviously reduce reduction cost.Wherein, Bayer process red mud also has can the composition sodium oxide molybdena of acceleration of sintering and alundum (Al2O3), these two kinds of compositions can reduce pelletizing fusing point, promote that the migration of metallic iron phase is grown up, thus be conducive to follow-up magnetic separation and be separated; Sodium oxide molybdena wherein also can be strengthened the reduction of iron mineral, improve the rate of recovery of reduced iron powder iron.Containing beneficiating ingredients such as calcium oxide, magnesia, manganese oxide and iron oxide in slag, particularly basic component calcium oxide wherein at high temperature can displace FeO from the silicate mineral of the iron content such as fayalite, hercynite, thus improves the reactivity of FeO, promotes the reduction of iron mineral.
In the present invention, the adding proportion of iron tailings preenrichment iron ore concentrate, Bayer process red mud, slag should be strict controlled in above-mentioned scope.Reason is: if Bayer process red mud is excessive, and the alundum (Al2O3) in Bayer process red mud easily reacts with ferriferous oxide and generates a large amount of hercynite, hinders the rate of recovery of the reduction of iron mineral, reduction reduced iron powder iron on the contrary; And if slag is excessive, then significantly can improves the fusing point of pelletizing, be unfavorable for pellet sintering, be unfavorable for that the migration of metallic iron phase is grown up, thus affect follow-up magnetic separation separation, easily cause reduced iron powder Iron grade and iron recovery to decline.
Described iron tailings preenrichment iron ore concentrate contains the component of following weight percents: full iron 35% ~ 50%, silica 25% ~ 45% and content lower than 6% oxide; Described oxide comprises alundum (Al2O3), calcium oxide and magnesia;
The described reducing agent added is one or both in bituminous coal or anthracite, content >=50% of fixed carbon in described reducing agent, and ash content < 20% in described reducing agent, and reducing agent consumption is 15% ~ 35%; Described reducing agent consumption refers to the mass percent of described reducing agent quality divided by the quality three sum of the quality of Bayer process red mud, the quality of slag and iron tailings preenrichment iron ore concentrate;
The described binding agent added is syrup or sodium carboxymethylcellulose; When described binding agent is syrup, the addition 5% ~ 10% of described syrup; When described binding agent is sodium carboxymethylcellulose, the addition of described sodium carboxymethylcellulose is 0.3% ~ 0.5%; The addition of described syrup and the addition of described sodium carboxymethylcellulose refer to syrup or refer to the mass percent of sodium carboxymethylcellulose quality divided by the quality three sum of the quality of Bayer process red mud, the quality of slag and iron tailings preenrichment iron ore concentrate; Select the binding agent of above-mentioned organic compound class, and select the inorganic compounds such as bentonite as binder phase ratio in conventional art, the binding agent of organic compound class can reduce the gangue content of pelletizing; And binding agent used is syrup or sodium carboxymethylcellulose, be organic compound, under high temperature reducing conditions, burning can generate the reducing atmosphere such as carbon monoxide, hydrogen, promotes the reduction of Pellet Iron Ore thing;
(3) high temperature reduction: dried by step (2) described green pellets, then puts into reducing atmosphere stove by described green pellets and carries out high temperature reduction, after described high temperature reduction terminates, is taken out described agglomerates and carries out nature cooling or water-cooled obtains agglomerates; Described high temperature reducing conditions is: temperature 1300 DEG C ~ 1350 DEG C, time 30min ~ 50min; The equipment that described high temperature reduction uses is rotary hearth furnace, if adopt rotary kiln or shaft furnace, roasting condition need according to the difference of equipment by experiment room test make corresponding adjustment to commerical test;
In the present invention, temperature is 1300 DEG C ~ 1350 DEG C, the high temperature reducing conditions of time 30min ~ 50min is the temperature being conducive to pellet sintering most, if and reduction temperature is more than 1350 DEG C, pelletizing easily generates a large amount of liquid phase in reduction process, on the one hand furnace bottom refractory brick is corroded very serious, worsen the reducing environment of iron mineral on the other hand, and easily form the metallic iron phase being mingled with gangue mineral.And if reduction temperature is lower than 1300 DEG C, the liquid phase that pelletizing generates in reduction process is very few, and inner sintering is very light, is unfavorable for the agglomeration of metallic iron phase.Under in 1300 DEG C ~ 1350 DEG C temperature ranges, be conducive to the migration agglomeration of metallic iron phase most, be conducive to follow-up magnetic separation and be separated, the reduced iron powder Iron grade and iron recovery that prepare can be significantly improved;
(4) wet milling and wet magnetic separation step: the described agglomerates that step (3) obtains is carried out fragmentation, obtains the particle that fineness is-2mm grade, then described particle is carried out secondary grinding two stages of magnetic separation, obtains the reduced iron powder of Iron grade >=88%; The reduced iron powder of described reduced iron grade >=88% can be used as the raw material of electric furnace steel making;
Described secondary grinding two stages of magnetic separation is specially: carry out primary grinding and a stages of magnetic separation first sequentially, then carries out secondary grinding and two stages of magnetic separation sequentially; The pulp density of described primary grinding is 50% ~ 60%, and mog should reach-0.074mm grain size content >=80%; The magnetic field intensity of a described stages of magnetic separation is 150Ak/m ~ 180Ak/m; The pulp density of described secondary grinding is 40% ~ 55%, and mog should reach-0.074mm grain size content >=90% and-0.038mm grain size content >=85%, and described two stages of magnetic separation magnetic field intensities are 60Ak/m ~ 80Ak/m.
embodiment 2
Contained by the Bayer process red mud that the present embodiment uses, slag and iron tailings preenrichment iron, the percentage by weight of component is as follows:
Bayer process red mud contains the component of following weight percents: full iron 21.52%, alundum (Al2O3) 17.64%, calcium oxide 14.43%, silica 1 0.50%, magnesia 1.84%, sodium oxide molybdena 4.72%;
Slag contains the component of following weight percents: full iron 19.37%, silica 1 2.22%, calcium oxide 35.82%, magnesia 11.00%, alundum (Al2O3) 6.84%;
Iron tailings preenrichment iron ore concentrate contains the component of following weight percents: full iron 36.34%, silica 41.71%, alundum (Al2O3) 1.82%, calcium oxide 1.82%, magnesia 1.69%.
Bayer process red mud and pretreatment of slag: dry 24 hours under described Bayer process red mud and described slag being placed in 100 DEG C of temperature, then carry out fragmentation, after broken, the granularity of Bayer process red mud and slag is all at below 1mm.
By weight, get described iron tailings preenrichment iron ore concentrate 100 parts, pretreated Bayer process red mud 5 parts, 20 parts, pretreated slag, (the bituminous coal consumption as reducing agent accounts for 17.5% of Bayer process red mud, slag and iron tailings preenrichment iron ore concentrate three quality sum to 21.9 parts, bituminous coal; Bituminous coal fixed carbon content is 56.41%, volatilization is divided into 28.45%, ash content is 14.02%), sodium carboxymethylcellulose 0.625 part (the sodium carboxymethylcellulose consumption as binding agent accounts for 0.5% of Bayer process red mud, slag and iron tailings preenrichment iron ore concentrate three quality sum), evenly obtains mixed material by above-mentioned mixing of materials; In mixed material, add 8 parts of water again mix, then obtain green pellets with the compacting of pressure ball equipment;
Dry described green pellets, then put into reducing atmosphere stove and reduce, reduction temperature is 1325 DEG C, and the recovery time is 40min.; After reduction terminates, agglomerates is taken out nature and cool and be crushed to-2mm, then carry out secondary grinding two stages of magnetic separation.Primary grinding pulp density be 50% and mog-0.074mm grain size content to account for 80%, one stages of magnetic separation magnetic field intensity be 180Ak/m, secondary grinding pulp density be 40% and the thin-0.074mm grain size content of ore grinding account for 95% and-0.038mm grain size content to account for 90%, two stages of magnetic separation magnetic field intensities be under the condition of 65Ak/m, can obtain Iron grade be 88.83% and iron recovery be the reduced iron powder of 85.48%.
embodiment 3
Contained by the Bayer process red mud that the present embodiment uses, slag and iron tailings preenrichment iron, the percentage by weight of component is as follows:
Bayer process red mud contains the component of following weight percents: full iron 39.42%, alundum (Al2O3) 13.16%, calcium oxide 1.55%, silica 8.02%, magnesia 0.07%, sodium oxide molybdena 3.50%;
Slag contains the component of following weight percents: full iron 19.37%, silica 1 2.22%, calcium oxide 35.82%, magnesia 11.00%, alundum (Al2O3) 6.84%;
Iron tailings preenrichment iron ore concentrate contains the component of following weight percents: full iron 36.34%, silica 41.71%, alundum (Al2O3) 1.82%, calcium oxide 1.82%, magnesia 1.69%.
Bayer process red mud and pretreatment of slag: dry 24 hours under described Bayer process red mud and described slag being placed in 100 DEG C of temperature, then carry out fragmentation, after broken, the granularity of Bayer process red mud and slag is all at below 1mm.
By weight, get described iron tailings preenrichment iron ore concentrate 100 parts, pretreated Bayer process red mud 15 parts, 20 parts, pretreated slag, (the bituminous coal consumption as reducing agent accounts for 20% of Bayer process red mud, slag and iron tailings preenrichment iron ore concentrate three quality sum to 27 parts, bituminous coal; Bituminous coal fixed carbon content is 56.41%, volatilization is divided into 28.45%, ash content is 14.02%), sodium carboxymethylcellulose 0.675 part (the syrup consumption as binding agent accounts for 0.5% of Bayer process red mud, slag and iron tailings preenrichment iron ore concentrate three quality sum), evenly obtains mixed material by above-mentioned mixing of materials; In mixed material, add 10 parts of water again mix, then obtain green pellets with the compacting of pressure ball equipment;
Dry described green pellets, then put into reducing atmosphere stove and reduce, reduction temperature is 1325 DEG C, and the recovery time is 40min; After reduction terminates, agglomerates is taken out nature and cool and be crushed to-2mm, then carry out secondary grinding two stages of magnetic separation.Primary grinding pulp density be 50% and mog-0.074mm grain size content to account for 80%, one stages of magnetic separation magnetic field intensity be 180Ak/m, secondary grinding pulp density be 40% and the thin-0.074mm grain size content of ore grinding account for 95% and-0.038mm grain size content to account for 90%, two stages of magnetic separation magnetic field intensities be under the condition of 65Ak/m, can obtain Iron grade be 97.02% and iron recovery be the reduced iron powder of 84.09%.
embodiment 4
Contained by the Bayer process red mud that the present embodiment uses, slag and iron tailings preenrichment iron, the percentage by weight of component is as follows:
Bayer process red mud contains the component of following weight percents: full iron 39.42%, alundum (Al2O3) 13.16%, calcium oxide 1.55%, silica 8.02%, magnesia 0.07%, sodium oxide molybdena 3.50%;
Slag contains the component of following weight percents: full iron 19.37%, silica 1 2.22%, calcium oxide 35.82%, magnesia 11.00%, alundum (Al2O3) 6.84%;
Iron tailings preenrichment iron ore concentrate contains the component of following weight percents: full iron 36.34%, silica 41.71%, alundum (Al2O3) 1.82%, calcium oxide 1.82%, magnesia 1.69%.
Bayer process red mud and pretreatment of slag: dry 24 hours under described Bayer process red mud and described slag being placed in 100 DEG C of temperature, then carry out fragmentation, after broken, the granularity of Bayer process red mud and slag is all at below 1mm.
By weight, get described iron tailings preenrichment iron ore concentrate 100 parts, pretreated Bayer process red mud 15 parts, 20 parts, pretreated slag, 27 parts, anthracite (the anthracite consumption as reducing agent accounts for 20% of Bayer process red mud, slag and iron tailings preenrichment iron ore concentrate three quality sum), 8.61 parts, syrup (the syrup consumption as binding agent accounts for 7% of Bayer process red mud, slag and iron tailings preenrichment iron ore concentrate three quality sum), evenly obtains mixed material by above-mentioned mixing of materials; In mixed material, add 5 parts of water again mix, then obtain green pellets with the compacting of pressure ball equipment;
Dry described green pellets, then put into reducing atmosphere stove and reduce, reduction temperature is 1300 DEG C, and the recovery time is 40min; After reduction terminates, agglomerates is taken out nature and cool and be crushed to-2mm, then carry out secondary grinding two stages of magnetic separation.Primary grinding pulp density be 50% and mog-0.074mm grain size content to account for 80%, one stages of magnetic separation magnetic field intensity be 180Ak/m, secondary grinding pulp density be 40% and the thin-0.074mm grain size content of ore grinding account for 95% and-0.038mm grain size content to account for 90%, two stages of magnetic separation magnetic field intensities be under the condition of 65Ak/m, can obtain Iron grade be 93.45% and iron recovery be the reduced iron powder of 82.43%.
Claims (8)
1. the preparation method of a reduced iron powder, it is characterized in that, described preparation method with Bayer process red mud, slag and iron tailings preenrichment iron ore concentrate for raw material, adopt iron tailings preenrichment concentrate described in described Bayer process red mud and described slag collaborative SCM, to reclaim the iron in described iron tailings preenrichment iron ore concentrate, described Bayer process red mud and described slag, prepare reduced iron powder.
2. the preparation method of a kind of reduced iron powder according to claim 1, is characterized in that, described preparation method comprises Bayer process red mud and pretreatment of slag, the preparation of green pellets, high temperature reduction and wet milling and wet magnetic separation step.
3. the preparation method of a kind of reduced iron powder according to claim 2, it is characterized in that, the binding agent added in the preparation process of described green pellets is organic compound class, described preparation method specifically:
(1) Bayer process red mud and pretreatment of slag: dry 24-30 hour under described Bayer process red mud and described slag are placed in the temperature of 95 DEG C-115 DEG C respectively, then carry out fragmentation, after broken, the granularity of described Bayer process red mud and described slag is all less than 1mm;
(2) preparation of green pellets: by weight, get described iron tailings preenrichment iron ore concentrate 100 parts, step (1) pretreated Bayer process red mud 5-20 part, step (1) pretreated slag 15-20 part, then reducing agent and organic compound class binding agent is added, mix, add 5-10 part water again to mix, obtain described green pellets with the compacting of pressure ball equipment;
(3) high temperature reduction: dried by step (2) described green pellets, then puts into reducing atmosphere stove by described green pellets and carries out high temperature reduction, after high temperature reduction terminates, is taken out by pelletizing after roasting and carries out nature cooling or water-cooled, obtain agglomerates; The condition of described high temperature reduction is: temperature 1300 DEG C ~ 1350 DEG C, time 30min ~ 50min;
(4) wet milling and wet magnetic separation: the described agglomerates that step (3) obtains is carried out fragmentation, obtains the particle that fineness is-2mm grade, then described particle is carried out secondary grinding two stages of magnetic separation, obtains the reduced iron powder of Iron grade >=88%.
4. the preparation method of a kind of reduced iron powder according to claim 3, it is characterized in that, described in step (1), Bayer process red mud contains the component of following weight percents: full iron 20% ~ 45%, aluminium oxide 10% ~ 20%, silica 5% ~ 15%, calcium oxide 1% ~ 15% and sodium oxide molybdena 3% ~ 9%;
Described in step (1), slag contains the component of following weight percents: full iron 5% ~ 25%, alundum (Al2O3) 1% ~ 8%, silica 1 0% ~ 15%, calcium oxide 35% ~ 60% and magnesia 3% ~ 13%.
5. the preparation method of a kind of reduced iron powder according to claim 3, it is characterized in that, described in step (2), iron tailings preenrichment iron ore concentrate contains the component of following weight percents: full iron 35% ~ 50%, silica 25% ~ 45% and content lower than 6% oxide; Described oxide comprises alundum (Al2O3), calcium oxide and magnesia.
6. the preparation method of a kind of reduced iron powder according to claim 3, it is characterized in that, described in step (2), the addition of reducing agent is 15% ~ 35%, described reducing agent is any one or two kinds in bituminous coal, anthracite, content >=50% of fixed carbon in described reducing agent, and ash content < 20% in described reducing agent; Described reducing agent addition refer to the quality of reducing agent divided by the quality of red mud, slag and iron tailings preenrichment iron ore concentrate three and mass percent.
7. the preparation method of a kind of reduced iron powder according to claim 3, is characterized in that, the described binding agent added in step (2) is syrup or sodium carboxymethylcellulose; When described binding agent is syrup, the addition 5% ~ 10% of described syrup; When described binding agent is sodium carboxymethylcellulose, the addition of described sodium carboxymethylcellulose is 0.3% ~ 0.5%; Described syrup or refer to the addition of sodium carboxymethylcellulose refer to syrup or refer to the quality of sodium carboxymethylcellulose divided by the quality of red mud, slag and iron tailings preenrichment iron ore concentrate three and mass percent.
8. the preparation method of a kind of reduced iron powder according to claim 3, it is characterized in that, described in step (4), secondary grinding two stages of magnetic separation is specially: carry out primary grinding and a stages of magnetic separation first sequentially, then sequentially to carrying out secondary grinding and two stages of magnetic separation; The pulp density of described primary grinding is 50% ~ 60%, and mog is-0.074mm grain size content >=80%; The magnetic field intensity of a described stages of magnetic separation is 150Ak/m ~ 180Ak/m; The pulp density of described secondary grinding is 40% ~ 55%, and mog is-0.074mm grain size content >=90% and-0.038mm grain size content >=85%, and described two stages of magnetic separation magnetic field intensities are 60Ak/m ~ 80Ak/m.
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