CN101418371B - Application of shaft furnace in baking full-vanadium ferrotitanium ore concentrate pellet ore - Google Patents
Application of shaft furnace in baking full-vanadium ferrotitanium ore concentrate pellet ore Download PDFInfo
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- CN101418371B CN101418371B CN2008103056751A CN200810305675A CN101418371B CN 101418371 B CN101418371 B CN 101418371B CN 2008103056751 A CN2008103056751 A CN 2008103056751A CN 200810305675 A CN200810305675 A CN 200810305675A CN 101418371 B CN101418371 B CN 101418371B
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Abstract
The invention relates to application of a shaft furnace to the roasting of full vanadium titanium iron ore concentrate pellet, which belongs to the technical field of the preparation method for the pellet. According to the method, the full vanadium titanium iron ore concentrate and 1.0 to 1.4 percent of bentonite are taken as raw materials which are used to prepare the full vanadium titanium iron ore concentrate pellet through even mixing, damp milling, pelletizing, drying and roasting, wherein the roasting temperature is 1,000 to 1,050 DEG C, and the roasting time is 30 to 60 minutes. The compressive strength of the full vanadium titanium iron ore concentrate pellet obtained by the method reaches 2,200N/piece. The pellet can be directly used for blast furnace smelting and also be used as a furnace protecting product during the blast furnace smelting of common ore.
Description
Technical field
The invention belongs to pellet preparation method technical field, the particularly application of shaft furnace in baking full-vanadium ferrotitanium ore concentrate pellet ore.
Background technology
In recent years, pellet production is in the stage of high speed development, and each Steel Plant is growing more intense to the contention of iron ore concentrate resource, and the blast-furnace smelting cost is also more and more higher.China's v-ti magnetite ore resources is quite abundant, but because sefstromite concentrate contains special composition such as higher vanadium, titanium, FeO, to enter blast-furnace smelting smoothly, must carry out artificial agglomeration to it handles, the one, enter sintering system, use the production agglomerate to use with other iron ore collocation for blast furnace; The 2nd, enter the pelletizing system, produce the pellet that contains sefstromite concentrate.Because sefstromite concentrate special physicochemical performance, its particle is thick, marginal surface is smooth, wetting ability is relatively poor, its balling property is relatively poor, be used in sintering system, bigger to SINTERING PRODUCTION operation and the influence of agglomerate yield and quality, so sefstromite concentrate is main and other iron ore collocation is used for the pellet that shaft furnace production contains the part sefstromite concentrate.
All-sefstromite concentrate pellet ore can only be fired with tube furnace, but leading indicators such as the finished product TFe that makes, FeO content and ultimate compression strength have been compared with common pellet by a relatively large margin and have been reduced, so the method for tube furnace baking full-vanadium ferrotitanium ore concentrate pellet ore is not used widely.
Yet there are no the method that adopts the shaft roasting all-sefstromite concentrate pellet ore.
Summary of the invention
Technical problem to be solved by this invention provides the new purposes of shaft furnace.
Particularly, this new purposes is the application of shaft furnace in baking full-vanadium ferrotitanium ore concentrate pellet ore.This method be with all-sefstromite concentrate with addition of the wilkinite of its weight 1.0～1.4% as raw material, through mixing, profit mill, make ball, drying and roasting and make all-sefstromite concentrate pellet ore; 1000～1050 ℃ of maturing temperatures, roasting time 30～60min.
Preferably, with addition of the wilkinite of its weight 1.2% during as raw material, the all-sefstromite concentrate pellet ore ultimate compression strength that roasting obtains is the highest with all-sefstromite concentrate.
Making ball step amount of water is 1～2% of raw material weight, and adding the water mode is that the balling disk (-sc) upper and lower adds simultaneously.Making needs screening before green-ball that the ball step makes is sent into shaft furnace, and the uniform cloth of green-ball that sieves out diameter 8～16mm is to the shaft furnace drying bed.
Further, make the converter mud slurry that the ball step can add raw material weight 2～4% and replace adding water, green ball strength increases substantially after converter mud slurry and the wilkinite acting in conjunction, the green-ball smooth surface, it is few to contain powder, and the green-ball size is evenly, bulk is less, can reduce labor strength.The converter mud slurry is the converter steelmaking waste, and weight concentration is 15～35%, and its major ingredient is the CaO about iron-bearing material and 10%, has certain adhesive property.
Make green-ball 500～550 ℃ of drying 4～6min in shaft furnace that the ball step makes.
Pelletizing needs preheating before the roasting, and temperature is 850～950 ℃; Calcination steps combustion air volume 8500～9000m
3/ min.
Pelletizing ultimate compression strength reaches 2200N/ after the all-sefstromite concentrate pellet ore roasting that the inventive method makes.
The chemical property of all-sefstromite concentrate of the present invention sees Table 1:
Table 1 unit: weight percent %
| ?TFe | ?FeO | ?SiO 2 | ?CaO | TiO 2 |
| ?52.08～56.52 | ?28.50～32.71 | ?3.63～3.99 | ?1.38～1.72 | 11.02～13.67 |
The invention has the beneficial effects as follows:
1, adopts the shaft roasting production cost low, pellet ultimate compression strength can be increased to the 2200N/ ball, can satisfy the requirement of large blast furnace pellet strength;
2, add the water mode and add, change in the balling disk (-sc) upper and lower and adding simultaneously, by above operation adjustment by original balling disk (-sc) top, quality of green pellets is obviously improved, and balling ratio rises, and contains powder and reduces, ultimate compression strength increases, and can satisfy subsequent technique requirement and roasting needs;
3, profit mill step can be done further levigately to the thicker all-sefstromite concentrate of particle, improves its balling property;
4, adopt the converter mud slurry to add swelling and make ball with local methods, can utilize the refuse of producing discharging, reduce cost.
Embodiment
The invention will be further elaborated below in conjunction with embodiment.Embodiment only is used to illustrate the present invention, rather than limits the present invention by any way.
The physics and the chemical property of the all-sefstromite concentrate that adopts among the embodiment see Table 2:
Table 2 unit: weight percent %
| TFe | FeO | SiO 2 | CaO | TiO 2 | -200 orders |
| 54.08 | 30.65 | 3.80 | 1.54 | 12.25 | 50.43 |
Embodiment 1
With raw material (all-sefstromite concentrate, wilkinite was by 98.8: 1.2 proportionings) by behind the belted electronic balance automatic blending, enter through belt transportation and to carry out mixing in the drum dry mixing machine, dehydration, mixing, mixture moisture after the dehydration is 5%, send into profit mill in the damp mill then, make raw material granularity 200 order grades increase about 10%, enter balling disc again and make ball, the balling disc size is Φ 6000 * 700mm (a limit height), rotating speed 8r/min, 46.5 ° at inclination angle, adding the water mode is that the balling disk (-sc) upper and lower adds simultaneously, and amount of water is 1～2% of a raw material weight, and the green-ball character that makes sees Table 3.
Green-ball is after the sieve apparatus screening, the green-ball of diameter 8～16mm by the uniform cloth of material distributing machine to the shaft furnace drying bed, shaft furnace drying bed temperature is controlled at 525 ℃, behind the dry 5min, green-ball after the oven dry directly is discharged into hard stove preheating and baking section, preheating temperature is controlled at 900 ℃, maturing temperature is controlled at 1030 ℃, the high-temperature roasting reaction times is controlled at 30min, the concrete parameter of roasting stage shaft furnace sees Table 3, behind the stove internal cooling, pelletizing is discharged on the belt-cooling machine, carries out promptly getting all-sefstromite concentrate pellet ore after the cooling second time by the electricity discharge machine that shakes.
Table 3
Can find out from table 3, the shaft roasting all-sefstromite concentrate is compared gas flow, pressure and is all descended to some extent with roasting iron ore pellets ore deposit, combustion air volume increases by a fairly big margin, and chamber temperature progressively descends, this and all-sefstromite concentrate FeO content height, high temperature oxidation is emitted a large amount of chemical heat and is matched.
The all-sefstromite concentrate pellet ore that makes contains TiO
212.05%, TFe 53.81%, and pelletizing ultimate compression strength 2200N/, can be directly used in blast-furnace smelting, also can be as the furnace retaining product when the common ore deposit of blast-furnace smelting.
Embodiment 2
With raw material (all-sefstromite concentrate, wilkinite was by 98.8: 1.2 proportionings) by behind the belted electronic balance automatic blending, enter through belt transportation and to carry out mixing in the drum dry mixing machine, dehydration, mixing, mixture moisture after the dehydration is 5.2%, send into profit mill in the damp mill then, make raw material granularity-200 order grade increase about 10%, enter balling disc again and make ball, the balling disc size is Φ 6000 * 700mm (a limit height), rotating speed 8r/min, 46.5 ° at inclination angle, the water add-on system of balling disc meets a bypass system and connects sludge sump, with pump the converter mud slurry is delivered to balling disk (-sc), when balling disc is made ball, spray the converter mud slurry that adds raw material weight 2～4% and replace spray to add water.
Green-ball is after the sieve apparatus screening, the green-ball of diameter 8～16mm by the uniform cloth of material distributing machine to the shaft furnace drying bed, shaft furnace drying bed temperature is controlled at 550 ℃, behind the dry 5min, green-ball after the oven dry directly is discharged into hard stove preheating and baking section, and preheating temperature is controlled at 920 ℃, and maturing temperature is controlled at 1050 ℃, the high-temperature roasting reaction times is controlled at 60min, and roasting stage all the other parameters of shaft furnace are identical with embodiment 1.Behind the stove internal cooling, pelletizing is discharged on the belt-cooling machine, carries out promptly getting all-sefstromite concentrate pellet ore after the cooling second time by the electricity discharge machine that shakes.
The all-sefstromite concentrate pellet ore that makes contains TFe 53.81%, FeO 0.5%, ultimate compression strength 2200N/ ball, qualification rate 100%.From the every index of pelletizing, can satisfy the blast-furnace smelting needs fully.This method had both reduced the pollution that converter mud brings to environment, had improved the quality of green-ball again greatly, had reduced wilkinite consumption.
The inventive method adopts the shaft roasting all-sefstromite concentrate to produce pellet, and the use new way of both having opened up all-sefstromite concentrate better for blast furnace provides furnace charge, has huge economic benefit and social benefit again.
Claims (7)
1. the application of shaft furnace in baking full-vanadium ferrotitanium ore concentrate pellet ore, it is characterized in that: with all-sefstromite concentrate with addition of the wilkinite of its weight 1.0～1.4% as raw material, through mixing, profit mill, make that roasting makes all-sefstromite concentrate pellet ore in ball, drying and the shaft furnace; Wherein, 1000～1050 ℃ of maturing temperatures, roasting time 30～60min; Preheating in shaft furnace before the pellet roasting, temperature is 850～950 ℃.
2. the application of shaft furnace according to claim 1 in baking full-vanadium ferrotitanium ore concentrate pellet ore is characterized in that: efficient wilkinite addition is 1.2% of an all-sefstromite concentrate weight.
3. the application of shaft furnace according to claim 1 in baking full-vanadium ferrotitanium ore concentrate pellet ore is characterized in that: the green-ball diameter of sending into shaft roasting is 8～16mm.
4. the application of shaft furnace according to claim 1 in baking full-vanadium ferrotitanium ore concentrate pellet ore is characterized in that: drying step is that green-ball is in 500～550 ℃ of drying 4～6min.
5. the application of shaft furnace according to claim 1 in baking full-vanadium ferrotitanium ore concentrate pellet ore is characterized in that: roasting combustion air volume 8500～9000m
3/ min.
6. according to each described shaft furnace application in baking full-vanadium ferrotitanium ore concentrate pellet ore of claim 1～5, it is characterized in that: make the water that the ball step adds raw material weight 1～2%.
7. according to each described shaft furnace application in baking full-vanadium ferrotitanium ore concentrate pellet ore of claim 1～5, it is characterized in that: make the converter mud slurry that the ball step adds raw material weight 2～4%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008103056751A CN101418371B (en) | 2008-11-21 | 2008-11-21 | Application of shaft furnace in baking full-vanadium ferrotitanium ore concentrate pellet ore |
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| CN2008103056751A CN101418371B (en) | 2008-11-21 | 2008-11-21 | Application of shaft furnace in baking full-vanadium ferrotitanium ore concentrate pellet ore |
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| CN101418371A CN101418371A (en) | 2009-04-29 |
| CN101418371B true CN101418371B (en) | 2011-05-11 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101805194B (en) * | 2010-03-13 | 2013-05-08 | 闫晓峰 | Furnace protecting agent for titanium concentrate sintering and preparation method thereof |
| CN102899435B (en) * | 2012-10-08 | 2014-04-16 | 北京神雾环境能源科技集团股份有限公司 | Method for comprehensively using vanadium-titanium magnetite by shaft furnace reduction and electric furnace melting |
| CN103451419B (en) * | 2013-08-23 | 2015-06-03 | 重钢西昌矿业有限公司 | Method for recovering iron, vanadium and titanium from schreyerite through shaft furnace reduction and electric furnace smelting and separating deep reduction |
| CN103695633B (en) * | 2014-01-07 | 2016-04-27 | 攀枝花钢企米易白马球团有限公司 | Rich titanium pelletizing and production method thereof |
| CN106191429A (en) * | 2016-08-09 | 2016-12-07 | 重庆大学 | A kind of city sewage sludge reclamation Application way |
| CN107655780A (en) * | 2017-08-31 | 2018-02-02 | 包头钢铁（集团）有限责任公司 | A kind of method for evaluating Iron concentrate balling property |
| CN109055734A (en) * | 2018-10-09 | 2018-12-21 | 鞍钢股份有限公司 | A kind of preparation method of blast furnace protecting composite briquette ore |
| CN111139352A (en) * | 2020-01-13 | 2020-05-12 | 蒋福军 | Production method of pellet ore |
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