CN105177293A - Method for comprehensively utilizing iron, aluminium and silicon in high-iron gibbsite - Google Patents
Method for comprehensively utilizing iron, aluminium and silicon in high-iron gibbsite Download PDFInfo
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- CN105177293A CN105177293A CN201510530645.0A CN201510530645A CN105177293A CN 105177293 A CN105177293 A CN 105177293A CN 201510530645 A CN201510530645 A CN 201510530645A CN 105177293 A CN105177293 A CN 105177293A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 156
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 98
- 238000000034 method Methods 0.000 title claims abstract description 47
- 229910001679 gibbsite Inorganic materials 0.000 title claims abstract description 36
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 30
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title abstract description 18
- 239000004411 aluminium Substances 0.000 title abstract description 16
- 229910052710 silicon Inorganic materials 0.000 title abstract description 16
- 239000010703 silicon Substances 0.000 title abstract description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title abstract description 10
- 229910001570 bauxite Inorganic materials 0.000 claims abstract description 36
- KMWBBMXGHHLDKL-UHFFFAOYSA-N [AlH3].[Si] Chemical compound [AlH3].[Si] KMWBBMXGHHLDKL-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000002893 slag Substances 0.000 claims abstract description 29
- 239000002802 bituminous coal Substances 0.000 claims abstract description 27
- 238000000227 grinding Methods 0.000 claims abstract description 27
- 238000003723 Smelting Methods 0.000 claims abstract description 23
- 238000007885 magnetic separation Methods 0.000 claims abstract description 23
- 230000009467 reduction Effects 0.000 claims abstract description 19
- 238000001465 metallisation Methods 0.000 claims abstract description 17
- 239000003054 catalyst Substances 0.000 claims abstract description 14
- 238000007731 hot pressing Methods 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 230000018044 dehydration Effects 0.000 claims abstract description 7
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 7
- 230000006698 induction Effects 0.000 claims abstract description 7
- 239000000696 magnetic material Substances 0.000 claims description 19
- 238000011084 recovery Methods 0.000 claims description 17
- 229910052751 metal Inorganic materials 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 12
- 229910000676 Si alloy Inorganic materials 0.000 claims description 11
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims description 11
- 230000006835 compression Effects 0.000 claims description 10
- 238000007906 compression Methods 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- 239000002956 ash Substances 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 8
- 241001062472 Stokellia anisodon Species 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 12
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 2
- 229910000789 Aluminium-silicon alloy Inorganic materials 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 230000006911 nucleation Effects 0.000 abstract 1
- 238000010899 nucleation Methods 0.000 abstract 1
- 238000006722 reduction reaction Methods 0.000 description 15
- 239000000470 constituent Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 230000001698 pyrogenic effect Effects 0.000 description 5
- 238000002386 leaching Methods 0.000 description 4
- 239000004568 cement Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005363 electrowinning Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- -1 iron aluminum silicon Chemical compound 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention provides a method for comprehensively utilizing iron, aluminium and silicon in high-iron gibbsite, and belongs to the technical field of comprehensive utilization for metallurgical resources. The method mainly comprises the following steps: carrying out adequate and uniform mixing, heating and hot-pressing on the high-iron gibbsite subjected to dehydration and breaking, pulverized bituminous coal, a reduction catalyst and a nucleation substitute to obtain a high-iron bauxite hot-pressed block; then carrying out metallization reduction on the high-iron bauxite hot-pressed block in a rotary hearth furnace, and obtaining direct reduction iron and aluminium-silicon furnace slag through two processes of ore grinding and two-order magnetic separation; and preparing an aluminium-silicon furnace slag hot-pressed block from the aluminium-silicon furnace slag through hot-pressing formation, and then smelting the aluminium-silicon furnace slag hot-pressed block in a medium-frequency induction furnace to obtain a primary aluminium-silicon alloy. The method provided by the invention has the advantages of being simple in process, short in flow, high in yield, low in cost and the like. The method provided by the invention has important practical significance for development and utilization of the high-iron gibbsite, and has a wide application prospect.
Description
Technical field
The invention belongs to Metallurgical resources technical field of comprehensive utilization, be specifically related to the method for a kind of high-iron gibbsite iron aluminium silicon comprehensive utilization.
Background technology
A kind of high-iron gibbsite is there is in areas such as the Zhangpu, Fujian of China, Penglai, Hainan Province, Taiwan great Tun Shan and Guigangs, Guangxi, it is the mutual embedding cloth of a kind of iron aluminum silicon mineral, unmanageable complicated iron aluminium silicon mineral intergrowth, is the important iron ore of China and bauxite resource.According to the data analysis of geology department, national reserves are more than 1,500,000,000 tons, and only the domestic reserves in Guangxi are just more than 2.0 hundred million tons.For the high-iron gibbsite that Guangxi is domestic, this ore deposit is distributed widely in Central Guangxi Nanning to Yulin one Dai Shiyuge counties and cities, and Relatively centralized in Guigang, Binyang, Heng County and neighbouring area, mineralising area is large, and ore body distributes in groups, and reserves are very abundant.Ore body is made up of red clay and bauxite, and mine-containing amount is generally 550 ~ 1500kg/m
3, orebody thickness 1.2 ~ 6.8m, bury shallow, topsoil is generally 0.5 ~ 1.5m, and most ore directly exposes earth's surface, can realize strip mining transformation.
Ore chemistry analysis shows, this high-iron gibbsite A1
2o
3content is 22% ~ 37% (average content 27%), Fe
2o
3content is 35% ~ 48% (average content 40%), SiO
2content 4% ~ 13% (average content 9%), is the mineral wealth of utility value.Can find out that from its composition this bauxite belongs to typical high ferro high-silicon type bauxite, wherein Fe
2o
3, Al
2o
3and SiO
2content all do not reach respective industrial grade requirement.Therefore, can not be simple produce Al by traditional method
2o
3or metallic iron product.Therefore, the utilization of high-iron gibbsite should be conceived to the high-efficiency comprehensive utilization of Fe, Al, Si constituent element.
Comprehensive utilizating research for the high-iron gibbsite of the type has carried out for many years, successfully proposes some method of comprehensive utilization simultaneously, sums up and be mainly pyrogenic process-wet method combined technique and wet processing.
Pyrogenic process-wet method combined technique: if publication number is that CN103757165A name is called that a kind of high-iron bauxite blast-furnace smelting has the patent application of valency constituent element method of comprehensive utilization, high-iron bauxite is prepared into respectively high-iron bauxite agglomerate and high-iron bauxite hot wafering, then carry out blast-furnace smelting, vanadium smelting blown in converter, the step such as slag leaching, obtain molten iron, cement and Al
2o
3deng product.If publication number is that CN103866078A name is called that a point patent application for the method for comprehensive utilization is melted in the prereduction of a kind of high-iron bauxite shaft furnace, high-iron bauxite is made high-iron bauxite hot wafering, and then through steps such as shaft furnace prereduction, molten point of electric furnace, slag leachings, obtain molten iron, cement and Al
2o
3deng product.If publication number is the patent application that CN101875129B name is called a kind of method that high-iron bauxite fully utilizes, high-iron bauxite reduction-magnetic separation is separated and obtains direct-reduction metal iron powder and the rich aluminium slag of non-magnetic product, by wet-leaching white carbon black and aluminum oxide or Tai-Ace S 150 etc.Pyrogenic process-wet method combined technique mainly realizes the separation of iron, aluminium, silicon, and the product obtained is iron or molten iron, SiO substantially
2or cement, Al
2o
3deng.But this technical process is longer, and pyrogenic process-wet method to be used in conjunction operation comparatively complicated, the Al obtained
2o
3need further Electrowinning metallic aluminium.
In sum, traditional high-iron gibbsite mostly is and first extracts iron, then utilizes pickling process to extract Al
2o
3.Pickling process mainly adopts the rich aluminium slags of process such as sulfuric acid, hydrochloric acid, nitric acid to realize the separation of aluminium, silicon etc., obtains technical grade pure alumina.Aluminum oxide generates electrolytic aluminum through electrolyzer Inner electrolysis again.At present, Chinese Aluminium output is more than 1,300 ten thousand tons/year, and wherein, the aluminium of 60% is with the form flow into the market places of aluminium alloy, wherein maximum with the consumption of aluminum silicon alloy.
Therefore, existing method all fails really to realize the comprehensive utilization of high-iron gibbsite, must adopt the method that pyrogenic process combines with wet method, long flow path, energy consumption is high, complicated operation, constituent element recovery rate be low.Usually, Al in high-iron gibbsite
2o
3with SiO
2mass ratio be less than 3.0, and be not suitable for adopt acid system leach Al
2o
3.
Therefore, up to the present, these high-iron gibbsite research and utilization techniques are showed no industrial applications and enforcement.So the high-iron bauxite of this composite factor containing valuable metals such as iron, aluminium, silicon still fails to obtain effective exploitation utilization at present.
In recent years, the iron ore of China and the increase of bauxite import volume.How effective exploitation utilizes high-iron gibbsite resource, alleviates the worsening shortages situation of China's iron ore deposit and bauxite resource, has become an important problem.Therefore, develop a kind of new high-iron gibbsite integrated approach, for China's Iron And Steel Industry and aluminum i ndustry, all there is important strategic importance.
Summary of the invention
For existing high-iron gibbsite comprehensive utilization process Problems existing, the present invention proposes the method for a kind of high-iron gibbsite iron aluminium silicon comprehensive utilization.The method significantly shorten technical process, and have technique simple, energy consumption is low, and iron, aluminium, silicon etc. have the advantage that the valency constituent element rate of recovery is high.
The present invention proposes the method for a kind of high-iron gibbsite iron aluminium silicon comprehensive utilization.The method realized specifically comprises the following steps.
(1) high-iron gibbsite is heated to do not slough crystal water higher than 600 DEG C, the high-iron gibbsite after dehydration is broken into the high-iron gibbsite breeze that granularity is not more than 0.15mm; Again bituminous coal powder is broken into granularity and is not more than 0.15mm pulverized bituminous coal; Wherein to require in high-iron gibbsite breeze by mass percentage: all iron content is not less than 15%, Al
2o
3content is not less than 20%, and Al
2o
3with SiO
2mass ratio be not more than 4.0, Fe in high-iron bauxite after dehydration
2o
3, Al
2o
3, SiO
2the mass percent summation of three is not less than 90%; In pulverized bituminous coal by mass percentage: fixed carbon content is not less than 55%, ash content not higher than 15%, volatile matter not higher than 30%, in pulverized bituminous coal ash content Al
2o
3and SiO
2the total mass mark ratio that accounts for pulverized bituminous coal ash content be not less than 70%.
(2) the high-iron gibbsite breeze after dehydration being pulverized, pulverized bituminous coal, reducing catalyst and forming core substituting agent four kinds of raw materials are by the mixing of certain massfraction, then be heated to 300 ~ 450 DEG C and be hot pressed into high-iron bauxite hot wafering, the high-iron bauxite hot wafering ultimate compression strength of preparation is not less than 600N, here, described four kinds of raw materials refer to by mass percentage by certain massfraction: the massfraction of high-iron gibbsite breeze is 65% ~ 85%, the massfraction of pulverized bituminous coal is 15% ~ 30%, the massfraction of reducing catalyst is 1.0% ~ 4.0%, the massfraction of forming core substituting agent is 4.0% ~ 8.0%, described reducing catalyst is Li
2cO
3, forming core substituting agent is metal iron powder, to require in forming core substituting agent metal iron powder by mass percentage: TFe content is not less than 90%, and degree of metalization is not less than 90%, and C content is 2.0% ~ 4.0%, Li
2cO
3all 0.074mm is not more than with the granularity of metal iron powder.
(3) high-iron bauxite hot wafering is loaded rotary hearth furnace and carry out metallization reduction, rotary hearth furnace reduction temperature is 1250 ~ 1350 DEG C, and the recovery time is 20 ~ 40min; Bed depth is 25 ~ 40mm; CO dividing potential drop P
cO/ (P
cO+ P
cO2) be not less than 94.72%, after having reduced, reduzate is entered naturally cooling in encloses container.
(4) after cooling, reduzate adopts grinding attachment to carry out twice ore grinding, two rank magnetic separation, specific requirement is: it is 20% ~ 30% that the part that after an ore grinding, granularity is less than 0.074mm accounts for reduzate ore grinding mass percent, single order magneticstrength is 50mT, and magnetic separation obtains single order Magnetic Materials and single order nonmagnetics; Then secondary grinding, second order magnetic separation are carried out to single order Magnetic Materials, it is 70% ~ 80% that the part that after secondary grinding, granularity is less than 0.074mm accounts for single order Magnetic Materials mass percent, second order magnetic field intensity is about 250 ~ 300mT, obtains second order Magnetic Materials and second order nonmagnetics after second order magnetic separation; Second order Magnetic Materials is direct-reduced iron, and its TFe content is higher than 90%, and degree of metalization is greater than 92%, and iron recovery is not less than 90%; Single order and second order nonmagnetics are aluminium silicon slag.
(5) obtained aluminium silicon slag and aforesaid pulverized bituminous coal are backed up according to quality mix than the ratio being 50% ~ 70%, 30% ~ 50%, heat, hot pressing makes aluminium silicon slag hot wafering, hot pressing temperature is 300 ~ 450 DEG C, and the aluminium silicon slag hot wafering ultimate compression strength be prepared into is not less than 600N.
(6) aluminium silicon slag hot wafering is joined in medium-frequency induction furnace smelt, the heating-up time of smelting temperature is raised to no longer than 30min from charging temperature, it is 2000 ~ 2100 DEG C that smelting temperature controls, and tap to tap time is 40 ~ 60min, and should control its atmosphere during smelting is reducing atmosphere.
(7) smelted and directly to have cast watering in ingot mould afterwards, after naturally cooling, obtained primary aluminum-silicon alloy; Adopt its aluminium silicon rate of recovery of this method more than 70%.
The invention has the advantages that: (1) proposes the thinking that catalytic reduction and forming core substitute first, significantly shorten the reduction of ferriferous oxide in high-iron gibbsite, forming core, time of growing up, be conducive to adopting reduction-magnetic separation process extraction iron; (2) Li is adopted
2cO
3do reducing catalyst and reduce gasification reaction temperature, not only increase the CO dividing potential drop under equal reduction temperature, and do not change the phase structure of reduzate, be beneficial to the utilization of follow-up aluminium silicon slag; (3) aluminium silicon slag being made carbon containing hot wafering, adopt medium-frequency induction furnace to carry out melting, reducing Al in reaction process by strictly controlling heating-up time, reduction temperature, smelting time etc.
2o, SiO, Al
4c
3generation, not only significantly improve the recovery rate of Al, Si constituent element, and improve the quality of aluminum silicon alloy; It is (4) first with tradition that high-iron gibbsite first carries iron, Al is carried in rear leaching
2o
3, electrolysis Al again
2o
3prepare commercial-purity aluminium, compared with last commercial-purity aluminium prepares aluminum silicon alloy technique with industrial pure silicon infiltration, the present invention significantly simplify Production Flow Chart, eliminates numerous wet method-firing method process, decreases pollution etc.Therefore, the present invention has that flow process is short, energy consumption is low, pollute little, low cost and other advantages, and the comprehensive development and utilization for high-iron gibbsite has important realistic meaning, has significant prospects for commercial application.
Embodiment
Further describe the present invention below in conjunction with specific embodiment, advantage and disadvantage of the present invention can be more clear in the de-scription, but these embodiments are only exemplary in nature, do not form any restriction to scope of the present invention.
Embodiment 1
Certain high-iron bauxite TFe content is 34.68%, Al
2o
3content be 23.85%, SiO
2content is 7.16%, and scaling loss is 17.50%, remaining as other impurity, wherein, and Al
2o
3with SiO
2mass ratio be 3.33.
The fixed carbon content of hot pressing bituminous coal is 61.55%, and ash content is 9.00%, and volatilization is divided into 28.09%, and Bound moisture is 1.36%, Al in ash content
2o
3content is 21.92%, SiO
2content is 55.15%.
Reducing catalyst Li
2cO
3for chemical reagent, Li
2cO
3content is higher than 98.60%; In forming core substituting agent metal iron powder, TFe content is 91.26%, and degree of metalization is 94.67%, and C content is 2.8%; Li
2cO
3all 0.074mm is less than with the granularity of metal iron powder.
Above-mentioned high-iron bauxite is heated to 550 DEG C and sloughs crystal water, be then broken into the powder material that granularity is not more than 0.15mm, bituminous coal powder is broken into granularity simultaneously and is not more than 0.15mm powder material.
By high-iron bauxite breeze, pulverized bituminous coal, reducing catalyst Li
2cO
3and forming core substituting agent metal iron powder according to mass percent be 77.46%, 18.54%, 2.0%, 2.0% ratio mixing, heating, hot pressing to 350 DEG C is hot pressed into high-iron bauxite hot wafering, the hot wafering ultimate compression strength made is 810N, and carbon oxygen mol ratio is 1.2.
Above-mentioned hot wafering is encased in rotary hearth furnace and carries out metallization reduction, reduction zone temperature is 1350 DEG C, and the CO dividing potential drop of reduction zone is 95.0%, and the recovery time is 40min, be drained into encloses container from discharge port by reduzate and cool, the degree of metalization of reduzate is 92.2%.
After product to be restored is cooled to room temperature, carry out twice ore grinding, two rank magnetic separation.It is 30% that the part that after an ore grinding, granularity is less than 0.074mm accounts for ore grinding mass percent, and single order magneticstrength is 50mT, and magnetic separation obtains single order Magnetic Materials and single order nonmagnetics.
Carry out secondary grinding, second order magnetic separation to single order Magnetic Materials again, it is 80% that the part that after secondary grinding, granularity is less than 0.074mm accounts for single order Magnetic Materials mass percent, and second order magnetic field intensity is about 300mT, obtains direct-reduced iron and second order nonmagnetics after second order magnetic separation.In direct-reduced iron, TFe content is 91.20%, and degree of metalization is 92.63%, and iron recovery is 90.46%.
By single order nonmagnetics and the mixing of second order nonmagnetics, then mix material, ratio that pulverized bituminous coal is 65%, 35% according to mass percent fully mixes, heats, is hot pressed into aluminium silicon slag hot wafering, the aluminium silicon slag hot wafering ultimate compression strength be prepared into is 967N.
Joined in medium-frequency induction furnace by aluminium silicon slag hot wafering and smelt, the time being raised to smelting temperature from charging temperature is 25min, and controlling smelting temperature is 2100 DEG C, and tap to tap time is 60min, and should control its atmosphere during smelting is reducing atmosphere.
Directly cast watering in ingot mould after smelting completes, obtain primary aluminum-silicon alloy after cooling, the dominant of primary aluminum-silicon alloy is Al, Si and a small amount of AlC mutually
4, the rate of recovery of aluminium, silicon is respectively 76.8%, 74.1%.
Embodiment 2
Adopt high-iron bauxite breeze, the pulverized bituminous coal reducing catalyst Li in embodiment 1
2cO
3and forming core substituting agent metal iron powder.
By high-iron bauxite breeze, pulverized bituminous coal, reducing catalyst Li
2cO
3and forming core substituting agent metal iron powder according to mass percent be 75.04%, 17.96%, 3.0%, 4.0% ratio mixing, heating, hot pressing to 350 DEG C is hot pressed into high-iron bauxite hot wafering, the hot wafering ultimate compression strength made is 750N, and carbon oxygen mol ratio is 1.2.
Above-mentioned hot wafering is encased in rotary hearth furnace and carries out metallization reduction, reduction zone temperature is 1350 DEG C, and the CO dividing potential drop of reduction zone is 95.0%, and the recovery time is 35min, be drained into encloses container from discharge port by reduzate and cool, the degree of metalization of reduzate is 94.6%.
After product to be restored is cooled to room temperature, carry out twice ore grinding, two rank magnetic separation.It is 25% that the part that after an ore grinding, granularity is less than 0.074mm accounts for ore grinding mass percent, and single order magneticstrength is 50mT, and magnetic separation obtains single order Magnetic Materials and single order nonmagnetics;
Carry out secondary grinding, second order magnetic separation to single order Magnetic Materials again, it is 75% that the part that after secondary grinding, granularity is less than 0.074mm accounts for single order Magnetic Materials mass percent, and second order magnetic field intensity is about 300mT, obtains direct-reduced iron and second order nonmagnetics after second order magnetic separation.In direct-reduced iron, TFe content is 93.60%, and degree of metalization is 94.82%, and iron recovery is 92.63%.
By single order nonmagnetics and the mixing of second order nonmagnetics, then mix material, ratio that pulverized bituminous coal is 62%, 38% according to mass percent fully mixes, heats, is hot pressed into aluminium silicon slag hot wafering, the aluminium silicon slag hot wafering ultimate compression strength be prepared into is 1020N.
Joined in medium-frequency induction furnace by aluminium silicon slag hot wafering and smelt, the time being raised to smelting temperature from charging temperature is 25min, and controlling smelting temperature is 2050 DEG C, and tap to tap time is 50min, and should control its atmosphere during smelting is reducing atmosphere.
Directly cast watering in ingot mould after smelting completes, obtain primary aluminum-silicon alloy after cooling, the dominant of primary aluminum-silicon alloy is Al, Si and a small amount of AlC mutually
4, the rate of recovery of aluminium, silicon is respectively 78.2%, 76.9%.
Embodiment 3
Adopt high-iron bauxite breeze, the pulverized bituminous coal reducing catalyst Li in embodiment 1
2cO
3and forming core substituting agent metal iron powder.
By high-iron bauxite breeze, pulverized bituminous coal, reducing catalyst Li
2cO
3and forming core substituting agent metal iron powder according to mass percent be 71.01%, 16.99%, 4.0%, 8.0% ratio mixing, heating, hot pressing to 350 DEG C is hot pressed into high-iron bauxite hot wafering, the hot wafering ultimate compression strength made is 720N, and carbon oxygen mol ratio is 1.2.
Above-mentioned hot wafering is encased in rotary hearth furnace and carries out metallization reduction, reduction zone temperature is 1350 DEG C, and the CO dividing potential drop of reduction zone is 95.0%, and the recovery time is 35min, be drained into encloses container from discharge port by reduzate and cool, the degree of metalization of reduzate is 96.2%.
After product to be restored is cooled to room temperature, carry out twice ore grinding, two rank magnetic separation.It is 22% that the part that after an ore grinding, granularity is less than 0.074mm accounts for ore grinding mass percent, and single order magneticstrength is 50mT, and magnetic separation obtains single order Magnetic Materials and single order nonmagnetics;
Carry out secondary grinding, second order magnetic separation to single order Magnetic Materials again, it is 72% that the part that after secondary grinding, granularity is less than 0.074mm accounts for single order Magnetic Materials mass percent, and second order magnetic field intensity is about 300mT, obtains direct-reduced iron and second order nonmagnetics after second order magnetic separation.In direct-reduced iron, TFe content is 94.20%, and degree of metalization is 95.60%, and iron recovery is 94.80%.
By single order nonmagnetics and the mixing of second order nonmagnetics, then mix material, ratio that pulverized bituminous coal is 60%, 40% according to mass percent fully mixes, heats, is hot pressed into aluminium silicon slag hot wafering, the aluminium silicon slag hot wafering ultimate compression strength be prepared into is 1080N.
Joined in medium-frequency induction furnace by aluminium silicon slag hot wafering and smelt, the time being raised to smelting temperature from charging temperature is 25min, and controlling smelting temperature is 2100 DEG C, and tap to tap time is 50min, and should control its atmosphere during smelting is reducing atmosphere;
Directly cast watering in ingot mould after smelting completes, obtain primary aluminum-silicon alloy after cooling, the dominant of primary aluminum-silicon alloy is Al, Si and a small amount of AlC mutually
4, the rate of recovery of aluminium, silicon is respectively 80.4%, 79.2%.
Claims (3)
1. a method for high-iron gibbsite iron aluminium silicon comprehensive utilization, is characterized in that, said method comprising the steps of:
(1) high-iron gibbsite is heated to do not slough crystal water higher than 600 DEG C, high-iron gibbsite after dehydration is broken into the high-iron gibbsite breeze that granularity is not more than 0.15mm, bituminous coal powder is broken into the pulverized bituminous coal that granularity is not more than 0.15mm;
(2) high-iron gibbsite breeze, pulverized bituminous coal, reducing catalyst and the forming core substituting agent mixing after dehydration being pulverized, then be heated to 300 ~ 450 DEG C and be hot pressed into high-iron bauxite hot wafering, wherein, the ultimate compression strength of high-iron bauxite hot wafering is not less than 600N, wherein, by mass percentage: the massfraction of high-iron gibbsite breeze is 65% ~ 85%, the massfraction of pulverized bituminous coal is 15% ~ 30%, the massfraction of reducing catalyst is 1.0% ~ 4.0%, and the massfraction of forming core substituting agent is 4.0% ~ 8.0%;
(3) high-iron bauxite hot wafering is loaded rotary hearth furnace and carry out metallization reduction, after having reduced, reduzate is entered naturally cooling in encloses container, wherein, rotary hearth furnace reduction temperature is 1250 ~ 1350 DEG C, recovery time is 20 ~ 40min, and bed depth is 25 ~ 40mm, CO dividing potential drop P
cO/ (P
cO+ P
cO2) be not less than 94.72%;
(4) cooled reduzate adopts grinding attachment to carry out twice ore grinding, two rank magnetic separation, it is 20% ~ 30% that the part that after an ore grinding, granularity is less than 0.074mm accounts for reduzate mass percent, single order magneticstrength is 50mT, magnetic separation obtains single order Magnetic Materials and single order nonmagnetics, then secondary grinding is carried out to single order Magnetic Materials, second order magnetic separation, it is 70% ~ 80% that the part that after secondary grinding, granularity is less than 0.074mm accounts for single order Magnetic Materials mass percent, second order magnetic field intensity is 250 ~ 300mT, second order Magnetic Materials and second order nonmagnetics is obtained after second order magnetic separation, second order Magnetic Materials is direct-reduced iron, single order and second order nonmagnetics are aluminium silicon slag, wherein, the TFe content of direct-reduced iron is higher than 90%, degree of metalization is greater than 92%, iron recovery is not less than 90%,
(5) ratio being 50% ~ 70%, 30% ~ 50% by mass percentage by obtained aluminium silicon slag and described pulverized bituminous coal mixes, heat, aluminium silicon slag hot wafering is made in hot pressing, wherein, hot pressing temperature is 300 ~ 450 DEG C, and the ultimate compression strength of aluminium silicon slag hot wafering is not less than 600N;
(6) aluminium silicon slag hot wafering is joined in medium-frequency induction furnace smelt, the heating-up time of smelting temperature is raised to no longer than 30min from charging temperature, it is 2000 ~ 2100 DEG C that smelting temperature controls, and tap to tap time is 40 ~ 60min, and controlling its atmosphere during smelting is reducing atmosphere;
(7) smelted and directly to have cast watering in ingot mould afterwards, after naturally cooling, obtained primary aluminum-silicon alloy.
2. method according to claim 1, is characterized in that, in described high-iron gibbsite breeze by mass percentage: all iron content is not less than 15%, Al
2o
3content is not less than 20%, and Al
2o
3with SiO
2mass ratio be not more than 4.0, Fe in high-iron bauxite after dehydration
2o
3, Al
2o
3, SiO
2the mass percent summation of three is not less than 90%; In pulverized bituminous coal by mass percentage: fixed carbon content is not less than 55%, ash content not higher than 15%, volatile matter not higher than 30%, Al in pulverized bituminous coal ash content
2o
3and SiO
2the total mass mark ratio that accounts for pulverized bituminous coal ash content be not less than 70%.
3. method according to claim 1, is characterized in that, described reducing catalyst is Li
2cO
3, forming core substituting agent is metal iron powder, and in described metal iron powder, TFe content is not less than 90% by mass percentage, and degree of metalization is not less than 90%, and C content is 2.0% ~ 4.0%, Li
2cO
3all 0.074mm is not more than with the granularity of metal iron powder.
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| CN102583477A (en) * | 2012-03-16 | 2012-07-18 | 东北大学 | Comprehensive utilization method of high-ferrum and low-grade bauxite |
| CN103643029A (en) * | 2013-12-09 | 2014-03-19 | 东北大学 | Reduced iron and aluminum separation method for high-iron bauxite carbon hot-pressed block containing shaft furnace |
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| CN102583477A (en) * | 2012-03-16 | 2012-07-18 | 东北大学 | Comprehensive utilization method of high-ferrum and low-grade bauxite |
| CN103643029A (en) * | 2013-12-09 | 2014-03-19 | 东北大学 | Reduced iron and aluminum separation method for high-iron bauxite carbon hot-pressed block containing shaft furnace |
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| CN109913665A (en) * | 2019-04-11 | 2019-06-21 | 昆明理工大学 | A kind of method that bauxite vacuum distillation prepares metallic aluminium |
| CN109913665B (en) * | 2019-04-11 | 2020-03-10 | 昆明理工大学 | Method for preparing metal aluminum by bauxite vacuum distillation |
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