CN103866078A - Pre-reduction and melting comprehensive utilization method of high-iron type bauxite shaft furnace - Google Patents
Pre-reduction and melting comprehensive utilization method of high-iron type bauxite shaft furnace Download PDFInfo
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 178
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 125
- 229910001570 bauxite Inorganic materials 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000002844 melting Methods 0.000 title abstract 4
- 230000008018 melting Effects 0.000 title abstract 4
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 34
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000002893 slag Substances 0.000 claims abstract description 27
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 22
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 14
- 239000001301 oxygen Substances 0.000 claims abstract description 14
- 239000003245 coal Substances 0.000 claims abstract description 11
- 230000009467 reduction Effects 0.000 claims abstract description 11
- 238000003723 Smelting Methods 0.000 claims abstract description 10
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052733 gallium Inorganic materials 0.000 claims abstract description 9
- 239000012141 concentrate Substances 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 19
- 239000000203 mixture Substances 0.000 claims description 17
- 230000004907 flux Effects 0.000 claims description 14
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- 239000003610 charcoal Substances 0.000 claims description 10
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 9
- 239000005864 Sulphur Substances 0.000 claims description 9
- 239000002802 bituminous coal Substances 0.000 claims description 9
- 239000004568 cement Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000007669 thermal treatment Methods 0.000 claims description 8
- 230000009977 dual effect Effects 0.000 claims description 7
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 238000010298 pulverizing process Methods 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 238000007731 hot pressing Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 2
- 238000005304 joining Methods 0.000 claims description 2
- 230000002829 reductive effect Effects 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- KCZFLPPCFOHPNI-UHFFFAOYSA-N alumane;iron Chemical compound [AlH3].[Fe] KCZFLPPCFOHPNI-UHFFFAOYSA-N 0.000 claims 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 18
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 239000000571 coke Substances 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 3
- 238000007664 blowing Methods 0.000 abstract 1
- 238000007599 discharging Methods 0.000 abstract 1
- 238000002347 injection Methods 0.000 abstract 1
- 239000007924 injection Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 239000004411 aluminium Substances 0.000 description 17
- 230000008569 process Effects 0.000 description 11
- 239000000126 substance Substances 0.000 description 10
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 description 6
- 238000002386 leaching Methods 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000001354 calcination Methods 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 4
- 230000008676 import Effects 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 238000001465 metallisation Methods 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 229910001569 aluminium mineral Inorganic materials 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- YOBAEOGBNPPUQV-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe].[Fe] YOBAEOGBNPPUQV-UHFFFAOYSA-N 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000001698 pyrogenic effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 230000031068 symbiosis, encompassing mutualism through parasitism Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The invention provides a pre-reduction and melting comprehensive utilization method of a high-iron type bauxite shaft furnace. The method comprises the steps of: preparing hot-pressed high-iron type bauxite compact by using high-iron type bauxite, and then loading the hot-pressed high-iron type bauxite compact, block coal or semi coke from the top of shaft furnace layer by layer, blowing oxygen-enriched hot air having temperature of 800-1200 DEG C and oxygen enrichment rate of 0.5%-3.0% from the reduction section located at the lower part in the shaft furnace, pre-reducing for 3 to 6 hours; then discharging material at 400-600 DGE C and then feeding into the electric furnace, melting at the temperature above 1600 DGE C to obtain vanadium containing molten iron and calcium aluminate slag; smelting vanadium containing molten iron in a converter by injection method to obtain vanadium slag and steel or ingots; controlling the cooling rate of calcium aluminate slag after furnace melting to be not more than 6 DGE C/min; when calcium aluminate slag is cooled to room temperature, carrying out secondary treatment to obtain products such as gallium concentrates, trioxide aluminum. The method disclosed by the invention has the advantages of use of raw materials with high applicability, high production efficiency, no use of coke and relatively low production costs.
Description
Technical field
The invention belongs to Metallurgical resources comprehensive utilization technique field, be specifically related to the method for molten point of comprehensive utilization of a kind of high-iron bauxite shaft furnace prereduction.
Background technology
In recent years, economic fast development has promoted growing continuously and fast of China's Iron And Steel Industry, and iron ore resource disparities between supply and demand become increasingly conspicuous.And China's iron ore rich ore is few, lean ore is many, the iron ore deposit of high-quality and Yi Xuan is fewer and feweri, domestic Iron And Steel Industry is had to more dependence on import iron ore to meet the demand of large-scale industrial production, to 2012, China has exceeded 60% to the dependency degree of imported iron ore stone, adds iron ore price continuous rise year after year, and this brings major hidden danger to the safety of China's Iron And Steel Industry and even whole national economy.Therefore, in the urgent need to relying on technical progress to develop to greatest extent the difficult iron-stone resource of selecting of low-grade complex, to ensure the sustainable and stable development of domestic Iron And Steel Industry.Meanwhile, the import volume of China's bauxite resource mineral products is also increasing year by year in recent years, the import volume of bauxite in 2012 has reached 3,961 ten thousand tons, account for the over half of China's bauxite industrial consumption amount, according to relevant estimation, bauxite resource may become China's Mineral resources next under one's control.
Area exists a kind of high-iron bauxite in Zhangpu, Fujian, Penglai, Hainan Province, Taiwan great Tun Shan and the Guigang, Guangxi of China etc., is the mutual embedding cloth of a kind of iron aluminium mineral, unmanageable complicated iron aluminium mineral intergrowth, is a kind of important iron ore of China and bauxite resource.According to the data analysis of geology department, its national prospective reserves exceedes 1,500,000,000 tons, and only the domestic reserves in Guangxi just exceed 2.0 hundred million tons.Take Guangxi, domestic high-iron bauxite is example, and this high-iron bauxite is distributed widely in Central Guangxi Nanning to Yulin one Dai Shiyuge counties and cities, and relatively concentrates on Guigang, Binyang, Heng County and neighbouring area, and 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, buries shallowly, and topsoil is generally 0.5～1.5m, and most ores directly expose earth's surface, can realize strip mining transformation.
Ore chemistry composition analysis shows, this high-iron bauxite 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.From its composition, can find out that this bauxite belongs to high ferro high-silicon type bauxite, wherein Fe
2o
3and Al
2o
3content all do not reach industrial grade requirement separately.Therefore, can not be simple produce Al by traditional method
2o
3or metallic iron product.Meanwhile, useful component gallium, the vanadium etc. of association in high-iron bauxite, wherein gallium content 0.068%～0.081%, V
2o
5content 0.10%～0.16% is all the resources that have important utility value.Therefore, the utilization of high-iron bauxite should be conceived to it the high-efficiency comprehensive utilization of valency constituent element.
Carry out for many years for the comprehensive utilizating research of high-iron bauxite both at home and abroad.The essence separating according to its iron aluminium can be divided into: aluminium method after iron processes, first iron after iron aluminium separating method, first aluminium.
Iron aluminium separating method is due to Iron In Iron-rich Containing Bauxite aluminium embedding cloth gummed, symbiosis closely, thereby is difficult to realize the separation of iron aluminium by General Physics beneficiation method; After first aluminium, iron processes is also called and first soaks rear smelting method, and the aluminium stone first being easy in ore being leached leaches, richer iron red mud is smelted, but not only Al of the method
2o
3leaching yield is low, and alkaline consumption is high, has brought certain difficulty adding with the residual blast furnace ironmaking to iron ore of alkali simultaneously, and after first aluminium, iron not can solve the exploitation problem of high-iron bauxite.
After first iron, aluminium method mainly refers to pyrogenic process separation of iron and aluminium, wherein, is typically the most sintering-blast-furnace smelting flow process of Northeastern University's exploitation.It can realize more than 90% recovery rate of iron aluminium, and likely realize large-scale industrial production, but its main drawback is high-iron bauxite sintering difficulty, the reductibility of high-iron bauxite agglomerate is poor simultaneously, and this blast furnace smelting process seriously relies on coke (coke ratio is not less than 1.3 tons).Therefore, up to the present, these high-iron bauxite research and utilization techniques are showed no industrial applications and enforcement.So this iron, aluminium, vanadium, the gallium etc. of containing of high-iron bauxite have the compound Mineral resources of valency constituent element still to fail effectively to be developed at present.
In recent years, not only sharply the increasing of the iron ore of China and bauxite import volume, and also price goes up year by year, consumed most of profit of metallurgy industry.How effective exploitation utilizes high-iron bauxite 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 bauxite comprehensive utilization process and all there is important strategic importance for China's Iron And Steel Industry and aluminium industry.
Summary of the invention
For above problem, the invention provides the method for molten point of comprehensive utilization of a kind of high-iron bauxite shaft furnace prereduction, specifically comprise the following steps:
(1) by high-iron bauxite, pulverized bituminous coal, flux after pulverizing in mass in 100:(40～65): the ratio of (40～65) is prepared burden, then fully mix, add the step such as hot wafering, thermal treatment, obtain high-iron bauxite hot wafering, wherein, high-iron bauxite granularity after pulverizing is not more than 0.15mm, full iron TFe content is not less than 30%, Al
2o
3content is not less than 20%; Pulverized bituminous coal fixed carbon content is not less than 50%, and volatile content is not higher than 35%, and sulphur content is not higher than 0.3%, and plastometer indice is not less than 8, and granularity is not less than 0.15mm; The effective flux component of flux is not less than 70%, and granularity is not more than 0.15mm; High-iron bauxite hot wafering hot pressing temperature is not higher than 500 ℃, and heat treatment mode is that airtight heat is vexed, and the high-iron bauxite hot wafering ultimate compression strength of preparation is not less than 800N/, and particle size range is 20～30mm, after heat treatment volatile matter V
dacontent is not higher than 1.8%, and ultimate compression strength is not less than 1200N/, and reduction swellability index RSI is not more than 15%, and joining carbon ratio (FC/O) is 1.5～3.0, and dual alkalinity is 3.5～4.0; The thermal source that mixes heating in hot wafering preparation process comes from the Low Temperature Thermal gas-fired that heat treatment process discharges.
(2) high-iron bauxite hot wafering, lump coal or blue charcoal are packed into from the layering of shaft furnace furnace roof, be the oxygen-enriched hot air that 800～1200 ℃, oxygen enrichment percentage are 0.5%～3.0% from shaft furnace middle and lower part reduction section winding-up temperature, high-iron bauxite hot wafering is carried out to prereduction, and the prereduction time is 3～6 hours; Here said lump coal requires its burst temperature to be not less than 600 ℃, and ash oontent is not higher than 15%, and carbon content is not less than 75%, and sulphur content is not higher than 0.3%, and moisture content is not higher than 10%; The fixed carbon content of blue charcoal is not less than 82%, and volatile matter is not higher than 4%, and ash content is not higher than 6%, and sulphur content is not higher than 0.3%, and moisture content is not higher than 10%, and the particle size range of lump coal and blue charcoal is 15～25mm; Oxygen-enriched hot air adopts shaft furnace furnace roof gas-fired preheating.
(3) high-iron bauxite hot wafering has become high-iron bauxite hot wafering iron after prereduction, and its degree of metalization is not less than 90%, and hot wafering iron is discharged by shaft furnace bottom, and drop temperature is 400～600 ℃.
(4) the high-iron bauxite hot wafering iron after coming out of the stove is carried out to molten point of electric furnace, obtain vanadium-bearing hot metal and calcium aluminate slag; Wherein, molten point atmosphere is neutrality or reducing atmosphere, a molten point temperature is not less than 1600 ℃, vanadium-bearing hot metal temperature is not less than 1400 ℃, calcium aluminate slag temperature is not less than 1450 ℃, and molten iron main chemical compositions is: Fe is that 94.53%～95.44%, Si is 0.24%～0.56%, C is that 2.93%～4.08%, V is 0.16%～0.23%; Slag main chemical compositions is: CaO is 49%～54%, SiO
2be 12%～15%, Al
2o
3be that 28%～32%, MgO is 2%～4%, other are 1%～4%, calcium aluminate slag dual alkalinity ω (CaO)/ω (SiO
2) be 3.8～4.0.
(5) vanadium-bearing hot metal is carried out to converter and blow vanadium smelting, obtain vanadium slag and iron and steel or steel ingot, wherein enter converter vanadium-bearing hot metal temperature and be not less than 1300 ℃.
(6) control the molten speed of cooling of dividing rear calcium aluminate slag of electric furnace and be no more than 6 ℃/min, when after its cool to room temperature, can obtain the products such as cement, gallium concentrate, aluminium sesquioxide through processing such as secondary leaching, desiliconization, manufacture of cement, carbonating decomposition, calcinings.
The fixed carbon content of the pulverized bituminous coal using in described method is not less than 50%, and volatile content is not higher than 35%, and sulphur content is not higher than 0.3%, and plastometer indice is not less than 8, and granularity is not less than 0.15mm; Effective flux component of flux is not less than 70%, and granularity is not more than 0.15mm.
The lump coal using in described method requires its burst temperature to be not less than 600 ℃, and ash oontent is not higher than 15%, and carbon content is not less than 75%, and sulphur content is not higher than 0.3%, and moisture content is not higher than 10%; The fixed carbon content of the blue charcoal using in described method is not less than 82%, and volatile matter is not higher than 4%, and ash content is not higher than 6%, and sulphur content is not higher than 0.3%, and moisture content is not higher than 10%, and the particle size range of lump coal and blue charcoal is 15～25mm.
The solvent using in aforesaid method is for containing CaO, CaF
2, MgO, Li
2cO
3etc. a kind of flux in multiple flux.
The advantage of this invention is: adopt high-iron bauxite hot wafering can process the high-iron bauxite of any grade, hot wafering adopts bituminous coal as reductive agent and binding agent simultaneously, hot pressing temperature is 500 ℃ of left and right, and energy consumption is low and carbon containing hot wafering rate of reduction is fast, and production efficiency is high.Compared with other iron-smelting raw materials, hot wafering has superior high temperature compression strength, can meet the service requirements of shaft furnace production completely, and shaft furnace belongs to the highest metallurgical reaction of thermodynamics utilising efficiency simultaneously, and the present invention need not use coke, oxygen-enriched hot air can the existing blast-furnace hot-air technology of grafting.Therefore, adaptability to raw materials of the present invention is strong, production efficiency is high, energy consumption is low, do not use coke, cost is low, and the feature such as industrial scale is large, contributes to China to large-scale develop and utilize the abundant high-iron bauxite resource of reserves, has broad application prospects.
Embodiment
Further describe the present invention below in conjunction with specific embodiment, advantage and disadvantage of the present invention can be more clear in description, but these embodiment are only exemplary, scope of the present invention are not formed to any restriction.
Embodiment 1
The full iron TFe of certain high-iron bauxite content is 34.68%, Al
2o
3content be 23.85%, its chemical composition is listed in table 1.
The main chemical compositions of table 1 high-iron bauxite
By this high-iron bauxite breeze, flux and pulverized bituminous coal, in mass ratio for 100:43.6:54.5 prepares burden, then mix, the step such as heating, briquetting, thermal treatment, obtain high-iron bauxite hot wafering after treatment, in high-iron bauxite hot wafering, join carbon ratio (FC/O=2.0), dual alkalinity ω (CaO)/ω (SiO
2)=3.88, its main chemical compositions is listed in table 2.
The main chemical compositions (FC/O=2.0, R=3.88) of high-iron bauxite hot wafering after table 2 thermal treatment
4412kg high-iron bauxite hot wafering after treatment, 100kg lump coal or blue charcoal are packed into from the layering of shaft furnace furnace roof, from the reduction section winding-up 1935m of shaft furnace middle and lower part
3the oxygen-enriched hot air of 1200 ℃ (oxygen enrichment percentage 0.5%), carry out shaft furnace prereduction, prereduction is after about 4.5 hours, can obtain degree of metalization and reach the stock gas 2894m that 90% high-iron bauxite hot wafering iron 3407kg and 300 ℃ of temperature, CO content are 33.62%
3, shaft furnace prereduction Process Energy utilization ratio is 83.39%, carbon element utilization ratio is 42.30%.
High-iron bauxite hot wafering iron, after molten point of electric furnace, can obtain 1000kg vanadium-bearing hot metal and 2407kg calcium aluminate slag.Vanadium smelting is blown in the further converter of vanadium-bearing hot metal can obtain approximately 13.09 ㎏ vanadium slags (containing the vanadium slag of Vanadium Pentoxide in FLAKES 20%) and 1050 ㎏ steel ingots; Calcium aluminate slag is cooling by controlling, and the processing such as secondary leaching, desiliconization, manufacture of cement, carbonating decomposition, calcining can obtain the products such as approximately 47 ㎏ cement, 0.38 ㎏ gallium concentrate, 700 ㎏ aluminium sesquioxides.
Embodiment 2
Adopt the high-iron bauxite in embodiment 1, by this high-iron bauxite breeze, flux and pulverized bituminous coal, in mass ratio for 100:48:54.8 prepares burden, then mix, the step such as heating, briquetting, thermal treatment, obtain high-iron bauxite hot wafering after treatment, in high-iron bauxite hot wafering, join carbon ratio (FC/O=2.2), dual alkalinity ω (CaO)/ω (SiO2)=3.81, its main chemical compositions is listed in table 3.
The main chemical compositions (FC/O=2.2, R=3.81) of high-iron bauxite hot wafering after table 3 thermal treatment
4493kg high-iron bauxite hot wafering after treatment, 50kg lump coal or blue charcoal are packed into from shaft furnace furnace roof, from the reduction section winding-up 2033m of shaft furnace middle and lower part
3the oxygen-enriched hot air of 1100 ℃ (oxygen enrichment percentage 0.5%), carry out shaft furnace prereduction, prereduction is after about 5 hours, can obtain degree of metalization and reach the stock gas 3016m that 90% high-iron bauxite hot wafering iron 3420kg and 300 ℃ of temperature, CO content are 33.63%
3, shaft furnace prereduction Process Energy utilization ratio is 82.92%, carbon element utilization ratio is 41.84%.
High-iron bauxite hot wafering iron, after molten point of electric furnace, can obtain 1000kg vanadium-bearing hot metal and 2420kg calcium aluminate slag.Vanadium smelting is blown in the further converter of vanadium-bearing hot metal can obtain approximately 13.08 ㎏ vanadium slags (containing the vanadium slag of Vanadium Pentoxide in FLAKES 20%) and steel ingot (1050 ㎏ steel ingot); Calcium aluminate slag is cooling by controlling, and the processing such as secondary leaching, desiliconization, manufacture of cement, carbonating decomposition, calcining can obtain the products such as about 47.5kg cement, 0.39kg gallium concentrate, 704kg aluminium sesquioxide.
Embodiment 3
Adopt the high-iron bauxite in embodiment 1, by this high-iron bauxite breeze, flux and pulverized bituminous coal, in mass ratio for 100:52.4:55 prepares burden, then mix, the step such as heating, briquetting, thermal treatment, obtain high-iron bauxite hot wafering after treatment, in high-iron bauxite hot wafering, join carbon ratio (FC/O=2.4), dual alkalinity ω (CaO)/ω (SiO2)=3.74, its main chemical compositions is listed in table 4.
The main chemical compositions (FC/O=2.4, R=3.74) of high-iron bauxite hot wafering after table 4 thermal treatment
4574kg high-iron bauxite hot wafering after treatment is packed into from shaft furnace furnace roof, from the reduction section winding-up 2132m of shaft furnace middle and lower part
3the oxygen-enriched hot air of 1000 ℃ (oxygen enrichment percentage 0.5%), carry out shaft furnace prereduction, prereduction is after about 5.5 hours, can obtain degree of metalization and reach the stock gas 3139m that 90% high-iron bauxite hot wafering iron 3432kg and 300 ℃ of temperature, CO content are 33.65%
3, shaft furnace prereduction Process Energy utilization ratio is 82.64%, carbon element utilization ratio is 41.40%.
High-iron bauxite hot wafering iron, after molten point of electric furnace, can obtain 1000kg vanadium-bearing hot metal and 3430kg calcium aluminate slag.Vanadium smelting is blown in the further converter of vanadium-bearing hot metal can obtain approximately 13.07 ㎏ vanadium slags (containing the vanadium slag of Vanadium Pentoxide in FLAKES 20%) and steel ingot (1050kg steel ingot); Calcium aluminate slag is cooling by controlling, and the processing such as secondary leaching, desiliconization, manufacture of cement, carbonating decomposition, calcining can obtain the products such as approximately 48 ㎏ cement, 0.40 ㎏ gallium concentrate, 708 ㎏ aluminium sesquioxides.
Claims (4)
1. a method for molten point of comprehensive utilization of high-iron bauxite shaft furnace prereduction, is characterized in that, said method comprising the steps of:
(1) by high-iron bauxite, pulverized bituminous coal, flux after pulverizing in mass in 100:(40～65): the ratio of (40～65) is prepared burden, then fully mix, add the step such as hot wafering, thermal treatment, obtain high-iron bauxite hot wafering, wherein, the granularity of the high-iron bauxite after pulverizing is not more than 0.15mm, full iron TFe content is not less than 30%, Al
2o
3content is not less than 20%; The hot pressing temperature of high-iron bauxite hot wafering is not higher than 500 ℃, and heat treatment mode is that airtight heat is vexed, and the ultimate compression strength of the high-iron bauxite hot wafering of preparation is not less than 800N/, and particle size range is 20～30mm, after heat treatment volatile matter V
dacontent is not higher than 1.8%, and ultimate compression strength is not less than 1200N/, and reduction swellability index RSI is not more than 15%, and joining carbon ratio (FC/O) is 1.5～3.0, and dual alkalinity is 3.5～4.0;
(2) high-iron bauxite hot wafering, lump coal or blue charcoal are packed into from the layering of shaft furnace furnace roof, be the oxygen-enriched hot air that 800～1200 ℃, oxygen enrichment percentage are 0.5%～3.0% from shaft furnace middle and lower part reduction section winding-up temperature, high-iron bauxite hot wafering is carried out to prereduction, and the prereduction time is 3～6 hours;
(3) high-iron bauxite hot wafering is discharged by shaft furnace bottom after being reduced into high-iron bauxite hot wafering iron, and drop temperature is 400～600 ℃;
(4) the high-iron bauxite hot wafering iron after coming out of the stove is carried out to molten point of electric furnace, obtain vanadium-bearing hot metal and calcium aluminate slag; Wherein, molten point atmosphere is neutrality or reducing atmosphere, and a molten point temperature is not less than 1600 ℃, and vanadium-bearing hot metal temperature is not less than 1400 ℃, and calcium aluminate slag temperature is not less than 1450 ℃, calcium aluminate slag dual alkalinity ω (CaO)/ω (SiO
2) be 3.8～4.0;
(5) vanadium-bearing hot metal is carried out to converter and blow vanadium smelting, obtain vanadium slag and iron and steel or steel ingot, wherein enter converter vanadium-bearing hot metal temperature and be not less than 1300 ℃;
(6) control the molten speed of cooling of dividing rear calcium aluminate slag of electric furnace and be no more than 6 ℃/min, when after its cool to room temperature, can obtain the products such as cement, gallium concentrate, aluminium sesquioxide through secondary treatment.
2. the method for molten point of comprehensive utilization of high-iron bauxite shaft furnace according to claim 1 prereduction, it is characterized in that, the fixed carbon content of the pulverized bituminous coal using in described method is not less than 50%, volatile content is not higher than 35%, sulphur content is not higher than 0.3%, plastometer indice is not less than 8, and granularity is not less than 0.15mm; Effective flux component of flux is not less than 70%, and granularity is not more than 0.15mm.
3. the method for molten point of comprehensive utilization of high-iron bauxite shaft furnace according to claim 1 prereduction, it is characterized in that, the lump coal using in described method requires its burst temperature to be not less than 600 ℃, ash oontent is not higher than 15%, carbon content is not less than 75%, sulphur content is not higher than 0.3%, and moisture content is not higher than 10%; The fixed carbon content of the blue charcoal using in described method is not less than 82%, and volatile matter is not higher than 4%, and ash content is not higher than 6%, and sulphur content is not higher than 0.3%, and moisture content is not higher than 10%, and the particle size range of lump coal and blue charcoal is 15～25mm.
4. high-iron bauxite carbon containing hot wafering reduction shaft furnace iron aluminum separation method according to claim 1, is characterized in that, the solvent using in described method is for containing CaO, CaF
2, MgO and Li
2cO
3in at least one flux.
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