CN102925676B - Novel energy-saving technology for producing pellets with fine-grained iron ore concentrates - Google Patents
Novel energy-saving technology for producing pellets with fine-grained iron ore concentrates Download PDFInfo
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Abstract
The invention discloses an energy-saving technology for producing pellets with fine-grained iron ore concentrates, which is characterized in that the novel energy-saving technology comprises the following steps that pulp of the iron ore concentrates is fed to an ore concentrate thickening machine to be thickened, fed to a ceramic filtering machine, subjected to batching, mixed by an intensive mixing machine, and pelletized by a disc pelletizer; then fresh pellets after being pelletized are fed to a small roll screen for screening; after the fresh pellets are treated by the small roll screen, the fresh pellets in unqualified grain sizes are return to the pelletizing process for pelletizing again, while the fresh pellets in qualified grain sizes are fed to a large roll screen for secondary screening; undersized products screened by the large roll screen return to the pelletizing process; the products on the large roll screen are fed to a chain grate; and after being fed to the chain grate, the qualified fresh pellets are dried and preheated by the chain grate, and then fed to a rotary kiln to be calcined and cooled to be qualified pellet products. The novel energy-saving technology has the advantages that on the premise that the product quality of the pellets is ensured, energy conservation and emission reduction are realized by optimizing the production technology and improving the production flow.
Description
Technical field
The invention belongs to the technique of preparing field, particularly a kind of granule iron concentrate is produced the pellet energy-saving technique.
Background technology
Along with effectively carrying out of China's Iron And Steel Industry macro adjustments and controls and result optimizing, the construction speed of pelletizing plant is very swift and violent, present more than 1,000,000 tons the scale pellet production line reached more than 50, the using as the blast furnace implementation of refined raw materials and improve burden structure of pellet, reach iron increasing and coke saving, reduce pig iron production cost, the most basic condition and the most effective technical measures are provided.The production of pellet generally has three kinds of techniques, be shaft furnace, belt machine and chain grate machine-rotary kiln, present large and medium-sized enterprise pellet production technique is substantially take belt machine and chain grate machine-rotary kiln as main, do basic fuel,, the clear superiority such as high temperature material require low and production cost low stronger than belt machine to the adaptability of material composition change because chain grate machine-rotary kiln has available coal dust, newly-built large and medium-sized pelletizing plant mostly adopts this technique.But chain grate machine-rotary kiln production process is not perfection, as produce the required iron ore concentrate of pellet and all need moisture to be reduced to the requirement that to satisfy next step mixing and pelletizing operation below 9% by the dry kiln drying, being converted to pellet per ton approximately need to consume about 1 kilogram coal-fired, also having wet returning charge that the pelletizing process produces and the broken ball under the grate-kiln grate plate sieve and powder is that dry bulk cargo all need be established special disintegrating apparatus (generally using column mill) and processes, but, because the necessity of wet returning charge disintegrating apparatus design itself is just not high, the crushing effect of doing returning charge equipment is another directly undesirable, therefore wastes a large amount of spare parts, electric energy and manual maintenance expense.
Summary of the invention
The objective of the invention is for the deficiencies in the prior art, provide under a kind of prerequisite guaranteeing the pellet quality product, by optimized production process, improve Production Flow Chart, realize that the granule iron concentrate of energy-saving and emission-reduction is produced the pellet energy-saving technique.
Produce the pellet energy-saving technique according to granule iron concentrate of the present invention, it is characterized in that: comprise the following steps:
(1) the iron ore concentrate ore pulp of concentration 25-35%, granularity-200 order content 90-95%, grade 67-67.5% being fed the concentrate thickener concentrates, the ore pulp of concentration 55%-65% after concentrated feeds ceramic filter and filters, and the concentrate moisture controlled after the filtration is below 9%;
(2) iron ore concentrate after will filtering feeds batch operation, its the batching be by weight by: iron ore concentrate: wilkinite: dedusting ash is 1: 0.011-0.016: 0.012-0.02 feeds intensive mixer and carries out mixture operation, the iron grade of material is 66-66.5% after mixing, and moisture is below 9.1%;
(3) mixed material is fed balling disc and carry out the pelletizing operation, the green-ball moisture after the pelletizing is 9.3% ± 0.2%, height of fall 500mm, and dropping strength is more than 4 times, and ultimate compression strength is more than the 11N/ ball, and mean particle size is 10-13mm;
(4) feeding little roll screen through the green-ball after the pelletizing sieves, pony roll is sieved top sieve roller clearance control at 6-9mm, pony roll lower part of screen sieve roller clearance control is sieved out the qualified green-ball of granularity 9-16mm at 12-16mm, and granularity＜9mm and granularity＞16mm are defective green-ball;
(5) return the pelletizing operation through the underproof green-ball of granularity after the processing of pony roll sieve and again participate in pelletizing, the green-ball that granularity is qualified feeds big roll screen, its big roll screen clearance control is carried out regrading at 5-7mm, the big roll screen screen undersize returns to the pelletizing operation, the big roll screen oversize feeds chain grate machine, and its grate plate slit is controlled at 5-7mm;
(6) feed that qualified green-ball behind the chain grate machine is dry through chain grate machine, feed rotary kiln after the preheating and carry out roasting, after the roasting through becoming final grade 65-65.2%, FeO content after the central cooler cooling less than 1% qualified pellet product.
The fragmentary dry bulb of discharging by grate plate slit or slit in the described chain grate machine drying process is called dry bulk cargo, dry bulk cargo is discharged with the grey leg of rapping apparatus by chain grate machine, the efflux time of dry bulk cargo will with pelletizing operation compound material loading time lock, dry bulk cargo maybe will feed a steady material control device by belt simultaneously, return to the pelletizing operation after the defeated yield of strict control, the blowing amount of the dry bulk cargo of unit time and operational throughput require less than 4% of unit time compound amount.
Described steady material control device is by ore storage bin, and the ore storage bin feeding machine that connects and the weighing balance that is arranged on the feeding machine forms therewith.
Compared with prior art, advantage of the present invention is:
The production that the present invention is directed to chain grate machine-rotary kiln pellet formation technological process is actual, by optimized production process, reduces concentrate moisture with ceramic filter, has cancelled original concentrate drying operation, saves a large amount of power consumptions; The practical situation that while is low for the broken Link Efficiency of the broken and dried returning charge of production process green-ball, energy consumption is high, do the returning charge amount by optimizing the control of roll screen device parameter and reasonably stability, cancelled the broken production link of the broken and dried returning charge of original green-ball, production process is further optimized.Enforcement of the present invention is fully enhanced the pellet formation process efficiency, and all technical is stable, and effects of energy saving and emission reduction is remarkable.
Description of drawings
Fig. 1 is process flow sheet of the present invention.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
As shown in Figure 1, granule iron concentrate of the present invention is produced the pellet energy-saving technique, it is characterized in that: comprise the following steps:
(1) the iron ore concentrate ore pulp of concentration 30%, granularity-200 order content 93%, grade 67.3% is fed the concentrate thickener and concentrate, the ore pulp of the concentration 60% after concentrated is fed ceramic filter filter, the concentrate moisture after the filtration is 8.8%;
(2) iron ore concentrate after the filtration is by batch operation, its batching is by iron ore concentrate: wilkinite by weight: dedusting ash is to feed intensive mixer at 1: 0.014: 0.015 to carry out mixture operation, the iron grade of material is 66.4% after mixing, and moisture is below 8.9%;
(3) mixed material is fed balling disc 11 and carry out the pelletizing operation, the green-ball moisture average out to 9.3% after the pelletizing, height of fall 500mm, dropping strength are average 4.5 times, ultimate compression strength average out to 12N/ ball, and mean particle size is 12.5mm;
(4) feed little roll screen through the green-ball after the pelletizing, its little roll screen is 21 sieve rollers, 1-9 root sieve roller gap, top is that 7mm, 9-10 root sieve roller gap are 12mm, 10-21 root sieve roller gap, bottom is 15mm, sieve, sieve out the qualified green-ball of granularity 9-16mm, granularity＜9mm and granularity＞16mm are defective green-ball
(5) return balling disc through the underproof granularity＜9mm of granularity and granularity＞16mm green-ball after the processing of pony roll sieve and again participate in pelletizing, the green-ball that granularity is qualified feeds big roll screen, its big roll screen is 27 rollers, sieve roller gap is 5.5mm, carry out regrading, sieve out on the sieve and sieve lower two kinds of products, the defective green-ball that sieves out with the pony roll sieve through the screen undersize after the big roll screen screening returns balling disc and carries out again pelletizing
(6) the big roll screen oversize is finished dry and pre-hot work after feeding chain grate machine, and produce pre-hot-bulb and two kinds of products of dry bulk cargo, its grate plate slit is 5.5mm, after dry bulk cargo feeds steady material control device, through the dry bulk cargo of output after the work output control, dry bulk cargo is with the screen undersize after the big roll screen screening and return balling disc through the defective green-ball that little roll screen sifts out and carry out again pelletizing, the preheating ball warp is crossed rotary kiln and is carried out feeding central cooler after the roasting, becomes the qualified pellet product of final grade 65.1%, FeO content 0.8% after cooling.
Produce 2000000 tons of pellet production lines per year and on average produce daily according to 6100 tons of calculating, operating rate 90.5%, iron ore concentrate consumption is that 980kg/t, bentonitic consumption are that the consumption of 14kg/t, dedusting ash is 15kg/t, then the amount of compound is 6160 ton per days.The day output of dry bulk cargo take 200 ton per days, set the concentrate dosage of iron ore concentrate by batch operation as 500t/h, bentonitic proportioning as 1.4%, the proportioning of dedusting ash is as 1.5%, take this amount that calculates compound as 514.5t/h, batching and mixing system need to turn round 12 hours, the blowing number of times of determining dry bulk cargo is 12 times/days, 2 hours once, then a hour blowing amount is 16.7 tons, and the ratio that accounts for compound is 3.24%.
The present invention is the function that has substituted original whizzer with concentrate thickener and ceramic filter, cancelled be used for that the pony roll sieve sieves out underproof-9mm green-ball ,+the original disintegrating apparatus of the defective screen undersize that 16mm green-ball and big roll screen sift out, and by the strict amount of controlling dry bulk cargo, solve the defective that original disintegrating apparatus exists, and then cancelled the original disintegrating apparatus that is used for dry bulk cargo.
The present invention has optimized the whole technological process of production, and production operation, technological method have had more rational variation than in the past.
(1) adopt ceramic filter after concentrate moisture can reach below 8.8%, and concentrate moisture can control by mine-supplying quantity, feed ore concentration and the cleaning system etc. of adjusting filter, running cost is far below other Method and process.
(2) the wet returning charge that produces of the follow-up screening operation of pelletizing is had bad luck rear wet bulb through belt (with certain drop) repeatedly and has substantially been become powdery, on the not impact of follow-up pelletizing.
(3) by strict control big or small roll screen gap and grate-kiln grate plate slit, particularly return amount, the runtime of pelletizing operation by the dry bulk cargo of strict control, make dry bulk cargo account for the ratio control of compound below 4%, and then cancelled dry bulk cargo disintegrating apparatus, make in the dry bulk cargo on the larger+0.076mm of pelletizing operation impact～-the 8mm grain size content can reduce about 20% when adopting former disintegrating apparatus, and-the 0.076mm grade and+the 8mm grade is on the not impact of pelletizing operation, therefore, not only reduce process cost after the improvement, also improved process quality.
Claims (3)
1. a granule iron concentrate is produced the pellet energy-saving technique, it is characterized in that: comprise the following steps:
(1) the iron ore concentrate ore pulp of concentration 25-35%, granularity-200 order content 90-95%, grade 67-67.5% being fed the concentrate thickener concentrates, the ore pulp of concentration 55%-65% after concentrated feeds ceramic filter and filters, and the iron ore concentrate moisture controlled after the filtration is below 9%;
(2) iron ore concentrate after will filtering feeds batch operation, its the batching be by weight by: iron ore concentrate: wilkinite: dedusting ash is 1: 0.011-0.016: 0.012-0.02 feeds intensive mixer and carries out mixture operation, the iron grade of material is 66-66.5% after mixing, and moisture is below 9.1%;
(3) mixed material is fed balling disc and carry out the pelletizing operation, the green-ball moisture after the pelletizing is 9.3% ± 0.2%, dropping strength is more than 4 times, and ultimate compression strength is more than the 11N/ ball, and mean particle size is 10-13mm;
(4) feeding little roll screen through the green-ball after the pelletizing sieves, pony roll is sieved top sieve roller clearance control at 6-9mm, pony roll lower part of screen sieve roller clearance control is sieved out the qualified green-ball of granularity 9-16mm at 12-16mm, and granularity＜9mm and granularity＞16mm are defective green-ball;
(5) return the pelletizing operation through the underproof green-ball of granularity after the processing of pony roll sieve and again participate in pelletizing, the green-ball that granularity is qualified feeds big roll screen, its big roll screen clearance control is carried out regrading at 5-7mm, the big roll screen screen undersize returns to the pelletizing operation, the big roll screen oversize feeds chain grate machine, and its grate plate slit is controlled at 5-7mm;
(6) feed that qualified green-ball behind the chain grate machine is dry through chain grate machine, feed rotary kiln after the preheating and carry out roasting, after the roasting through becoming final grade 65-65.2%, FeO content after the central cooler cooling less than 1% qualified pellet product.
2. granule iron concentrate according to claim 1 is produced the pellet energy-saving technique, it is characterized in that: the fragmentary dry bulb of discharging by grate plate slit or other slit in the described chain grate machine drying process is called dry bulk cargo, dry bulk cargo is discharged with the grey leg of rapping apparatus by chain grate machine, the efflux time of dry bulk cargo will with pelletizing operation compound material loading time lock, dry bulk cargo will feed a steady material control device by belt simultaneously, return to the pelletizing operation after the defeated yield of strict control, the blowing amount of the dry bulk cargo of unit time and operational throughput require less than 4% of unit time compound amount.
3. granule iron concentrate according to claim 2 is produced the pellet energy-saving technique, it is characterized in that: described steady material control device is by ore storage bin, and the ore storage bin feeding machine that connects and the weighing balance that is arranged on the feeding machine forms therewith.
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| CN103468938B (en) * | 2013-09-04 | 2015-01-07 | 鞍钢集团矿业公司 | Method for improving uniformity of iron material in pellets |
| CN103937965B (en) * | 2014-03-19 | 2016-04-06 | 唐山国丰钢铁有限公司 | A kind of fine ore is with addition of dedusting ash agglomerates miner skill |
| CN103993158B (en) * | 2014-06-06 | 2017-02-15 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Process and system for removing alkali metals out of iron and steel making fly ash |
| CN106702148A (en) * | 2016-12-11 | 2017-05-24 | 北京神雾环境能源科技集团股份有限公司 | Disc type pelletizer provided with screening device |
| CN107282260B (en) * | 2017-07-20 | 2018-10-12 | 山东钢铁集团日照有限公司 | A kind of pellet screening reuse method |
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| CN101003851A (en) * | 2006-09-22 | 2007-07-25 | 攀钢集团钢城企业总公司球团厂 | Method for producing high titanium type acid pellet vanadium titanium by chain grate - rotary kiln |
| CN101134999A (en) * | 2007-03-15 | 2008-03-05 | 大连熔融还原设备制造有限公司 | Metallized pellet and method for preparing the same |
| CN101643841B (en) * | 2009-08-21 | 2011-07-20 | 武汉钢铁(集团)公司 | Additive for improving metallurgical performance of all Fe2O3 pellets and use method thereof |
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Address after: 114001 Anshan District, Liaoning, No. 219 Road, No. 39, Tiedong Patentee after: Anshan Iron and Steel Group Mining Co., Ltd. Address before: 114001 Anshan District, Liaoning, No. 219 Road, No. 39, Tiedong Patentee before: Angang Group Mine Company |