CN102102146B - Method for sintering high-aluminum refractory limonite - Google Patents
Method for sintering high-aluminum refractory limonite Download PDFInfo
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- CN102102146B CN102102146B CN 200910248757 CN200910248757A CN102102146B CN 102102146 B CN102102146 B CN 102102146B CN 200910248757 CN200910248757 CN 200910248757 CN 200910248757 A CN200910248757 A CN 200910248757A CN 102102146 B CN102102146 B CN 102102146B
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Abstract
The invention provides a method for sintering high-aluminum refractory limonite, which comprises steps of proportioning sinter, performing primary mixing and secondary mixing, distributing, igniting, sintering, cooling and sieving, and is characterized in that: the sinter comprises the following components in percentage by weight: 5 to 15 percent of high-aluminum refractory limonite, 80 to 65 percent of other iron ores, 13 to 16 percent of flux and 2 to 4 percent of fuel; and the high-aluminum refractory limonite is sieved before being proportioned, the high-aluminum refractory limonite of which the diameter is less than 1mm is mixed with 5 to 10 percent of the total amount of limestone powder in the flux so as to prepare particles of which the water content is 6.5 to 7.5 percent and the diameter is less than 3mm, and 5 to 10 weight percent of high-aluminum refractory limonite of which the diameter is more than or equal to 1mm is wetted by water. The high-aluminum refractory limonite in an appropriate adding proportion is subjected to sintering production, so that sintering raw material cost is greatly reduced.
Description
Technical field
The invention belongs to the sintering technology field, relate in particular to the using method of a kind of high alumina Rebellious brown iron ore in sintering.
Background technology
For a long time, domestic sintering imported iron ore fines is take rhombohedral iron ore as main, and rhombohedral iron ore is owing to exploiting throughout the year, and reserves reduce year by year, estimate after 10 years, and existing haematite mining mining area will be closed the hole successively; And external complicated Rebellious brown iron ore (rhombohedral iron ore that contains crystal water) resource reserve is large, and utilization ratio is extremely low, and price is low, even indivedual mineral are not utilized substantially.
So-called refractory iron ore is that storage requirement is complicated, and type is many, and the unwanted component content such as sulphur, phosphorus, silicon-dioxide, aluminium sesquioxide are high, and the useful component disseminated grain size is thin, and the selecting and purchasing difficulty is large, efficient is low, the iron ore of poor product quality.
Flourish along with Iron And Steel Industry, Mineral resources day is becoming tight, and international ore deposit valency significantly rises and causes steel cost to rise steadily, and how to reduce cost, and obtaining maximum profit is the pressing problem that iron and steel enterprise must face.According to present World Iron ore resource distribution situation and sintering technology development trend, it is the effective measure that iron and steel enterprise reduces cost that SINTERING PRODUCTION is used cheap Rebellious brown iron ore resource.The complicated Rebellious brown iron ore resource of rational exploitation and utilization is for alleviating China's iron ore disparities between supply and demand and ensureing that the safety of China's Iron And Steel Industry economy is significant.
The present invention is take a kind of high alumina, high silicon Rebellious brown iron ore as research object, and this ore deposit iron grade is 50%～60%, Al
2O
3Content is 5%～9%, SiO
2Content is 5%～8%.Process mineralogy studies show that, iron in the ore mainly exists with the form of hematite-limonite, disseminated grain size is thin, and this part ore is subjected to the factor affecting such as territorial environment, Ore Genesis, ore dressing equipment, selected selecting process generally comparatively complicated, separation index is lower.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of method that the high alumina Rebellious brown iron ore is realized SINTERING PRODUCTION as the cheap iron charge of sintering is provided.
It is to realize like this that the present invention uses the sintering method of high alumina Rebellious brown iron ore, the method comprises following operation: to sintered material prepare burden, mixed once and secondary mixing granulation, cloth, igniting, sintering, cooling and screening, it is characterized in that the proportioning of described sintered material by weight percentage: high alumina Rebellious brown iron ore 5%～15%, other iron ore 80%～65%, flux 13%～16%, fuel 2%～4%; Before batching, first the high alumina Rebellious brown iron ore is sieved, to mix less than 5%～10% of limestone powder total amount in the high alumina Rebellious brown iron ore of 1mm and the flux, controlling its moisture is 6.5%～7.5%, and make granularity less than the small particles material of 3mm by drum pelletizer, to fetch water wetting by 5～10% of its weight more than or equal to the high alumina Rebellious brown iron ore of 1mm, and then with other iron ore, flux and fuel are prepared burden together, mixed pelletization, again the granulation green-ball is carried out cloth, bed depth is 500～700mm, with certain pressure the sintered material of charge level is pressed down 20～50mm with dull and stereotyped behind the automatic distributing, the sintering of lighting a fire again, be 1～3min ignition time, and the sintering ignition negative pressure is 8～10KPa, and the down draft sintering negative pressure is 10000Pa～12000Pa, whole grain just makes the finished product agglomerate after cooling.
Other iron ore of the present invention is magnetite concentrate and mixing iron ore, and its weight ratio accounts for respectively 50%～25% and 30%～40% of sintered material; Described flux is that limestone powder, unslaked lime and its weight ratio of magnesite powder account for respectively 7%～4%, 4%～8%, 2%～4% of sintered material; Described fuel is coke powder; Mixing iron ore in described high alumina Rebellious brown iron ore and other iron ore is without the iron ore raw material of crossing ore grinding, and its granularity is 0～10mm; Magnetite concentrate in described other iron ore is the product after fine grinding, ore dressing, and its granularity＜200 purposes account for more than 90%.
The present invention has realized using suitable high alumina Rebellious brown iron ore with addition of ratio to carry out SINTERING PRODUCTION by the high alumina Rebellious brown iron ore being carried out the measures such as pre-wetting and prefabricated grain.Experiment showed, the high alumina composition that adopts in the production method high alumina Rebellious brown iron ore of the present invention on blast furnace slag without impact, thereby greatly reduce the raw materials for sintering cost.
Description of drawings
Accompanying drawing is the process flow diagram of production method of the present invention.
Embodiment
The present invention is further described by the following embodiment.
The embodiment of the invention is all take sintering cup test as example.
Embodiment 1
Agglomerate target basicity is 2.2, target MgO content 2.0%.
Sintered material proportioning: high alumina Rebellious brown iron ore 5.2%, other iron charge 78% (magnetite concentrate proportioning 39% and mixing iron ore proportioning 39%), limestone powder 5.9%, unslaked lime 5.9%, magnesite powder 2.5%, coke powder 2.5%.
First the high alumina Rebellious brown iron ore is sieved, 8% the moisture that adds its weight greater than the part of 1mm is wetting in advance, partly adds 7% of limestone powder weight less than 1mm and carries out mixing granulation.And then carry out mixed once and secondary mixing granulation with other various materials.Secondary mixed material is distributed in the sintered cup through the automatic distributing device, the sintered material that will exceed the sintered cup charge level with dull and stereotyped pressure with 0.2t behind the automatic distributing presses down 20mm to the sintered cup horizontal plane, igniting, sintering, wherein be 1.5min ignition time, the igniting negative pressure is 8820Pa, and the sintering negative pressure is 10780Pa, bed depth 700mm, sintered ore rotary drum strength is 63.88%, and the sintering utilization coefficient is 1.462t/m
2.h, solid burnup 47.62kg/t.With do not compare 11.36 yuan of raw materials for sintering costs, 6.5 yuan of sintering total benefits with addition of difficult ore dressing.
Embodiment 2
Target basicity is 2.2, target MgO content 2.0%.
The sintered material proportioning: high alumina Rebellious brown iron ore 9.3%, other iron charge 74% (magnetite concentrate proportioning 38% and mixing iron ore proportioning 36%), limestone powder 6.5%, unslaked lime accounts for 5.2%, magnesite powder 2.5%, coke powder 2.5%.
First the high alumina Rebellious brown iron ore is sieved, pre-wetting and prefabricated grain processing parameter is with embodiment 1.Then prepare burden, carry out mixed once and secondary mixing granulation, secondary mixed material is distributed in the sintered cup through the automatic distributing device, and the sintered material that will exceed the sintered cup charge level with dull and stereotyped pressure with 0.3t behind the automatic distributing presses down 25mm to the sintered cup horizontal plane, igniting, sintering, wherein be 2.0min ignition time, the igniting negative pressure is 8820Pa, and the sintering negative pressure is 10780Pa, bed depth 700mm, sintered ore rotary drum strength is 62.96%, and the sintering utilization coefficient is 1.414t/m
2.h, solid burnup 46.5kg/t.With do not compare 31.11 yuan of raw materials for sintering costs, 6.1 yuan of sintering total benefits with addition of difficult ore dressing.
Embodiment 3
Target basicity is 2.2, target MgO content 2.0%.
Sintered material proportioning: high alumina Rebellious brown iron ore 12.2%, other iron charge 70% (magnetite concentrate proportioning 38% and mixing iron ore proportioning 32%), limestone powder 6.6%, unslaked lime 5.8%, magnesite powder 2.5%, coke powder 2.9%.
First the high alumina Rebellious brown iron ore is sieved, pre-wetting and prefabricated grain processing parameter is with embodiment 1.Then prepare burden, carry out mixed once and secondary mixing granulation, secondary mixed material is distributed in the sintered cup through the automatic distributing device, the sintered material that will exceed the sintered cup charge level with dull and stereotyped pressure with 0.4t behind the automatic distributing presses down 30mm to the igniting of sintered cup horizontal plane, sintering, and wherein be 2.5min ignition time, and the igniting negative pressure is 8820Pa, the sintering negative pressure is 10780Pa, bed depth 600mm, sintered ore rotary drum strength are 62.03%, and the sintering utilization coefficient is 1.332t/m
2.h, solid burnup 48.45kg/t.With do not compare 45.63 yuan of raw materials for sintering costs, 1.7 yuan of sintering total benefits with addition of difficult ore dressing.
Claims (6)
1. sintering method that uses the high alumina Rebellious brown iron ore, comprise sintered material is prepared burden, once reached secondary mixing, cloth, igniting, sintering, cooling and screening, it is characterized in that the proportioning of described sintered material by weight percentage: high alumina Rebellious brown iron ore 5%～15%, other iron ore 80%～65%, flux 13%～16%, fuel 2%～4%; Before batching, first the high alumina Rebellious brown iron ore is sieved, to mix less than 5%～10% of limestone powder total amount in the high alumina Rebellious brown iron ore of 1mm and the flux, controlling its moisture is 6.5%～7.5%, and make granularity less than the small particles material of 3mm by mixer, to fetch water by 5～10% of its weight more than or equal to the high alumina Rebellious brown iron ore of 1 mm wetting, and then participate in batching; Described sintered material presses down 20～50mm with dull and stereotyped sintered material with charge level behind cloth; The sinter bed height is 500～700mm, and the sintering ignition time is 1～3min, and the sintering ignition negative pressure is 8～10KPa, and the down draft sintering negative pressure is 10000Pa～12000Pa.
2. sintering method according to claim 1 is characterized in that described other iron ore is magnetite concentrate and mixes iron ore, and the ratio that its weight ratio accounts for sintered material is respectively 50%～25% and 30%～40%.
3. sintering method according to claim 1 and 2 is characterized in that described flux is limestone powder, unslaked lime and magnesite powder, and the ratio that its weight ratio accounts for sintered material is respectively 7%～4%, 4%～8%, 2%～4%.
4. sintering method according to claim 1 and 2 is characterized in that described fuel is coke powder.
5. sintering method according to claim 1 and 2 is characterized in that described high alumina Rebellious brown iron ore is fine iron ore, and with the same being without the iron ore raw material of crossing ore grinding, sorting of mixing iron ore in other iron ore, granularity is below the 10mm.
6. sintering method according to claim 1 and 2 is characterized in that the magnetite concentrate in described other iron ore is the product after fine grinding, ore dressing, and its granularity＜200 purposes account for more than 90%.
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| CN102586591A (en) * | 2012-03-09 | 2012-07-18 | 中南大学 | Process for producing sintered ore for ironmaking through blast furnace from high-aluminum limonite |
| CN103215443B (en) * | 2013-05-21 | 2014-04-23 | 唐山瑞丰钢铁（集团）有限公司 | High-ore-matching-ratio brown iron ore sintering technology |
| CN103409618A (en) * | 2013-08-14 | 2013-11-27 | 山西太钢不锈钢股份有限公司 | Manufacturing method of self-fluxing sintered ore |
| CN104726695A (en) * | 2013-12-23 | 2015-06-24 | 鞍钢股份有限公司 | Method for granulating sintering mixture from ore fines by prescreening reinforcement |
| CN104152677B (en) * | 2014-08-18 | 2016-07-06 | 武汉钢铁(集团)公司 | A kind of control method of the suitable granulating moisture content of sinter mixture |
| CN105420491A (en) * | 2015-11-27 | 2016-03-23 | 攀钢集团攀枝花钢钒有限公司 | Iron ore sintering method |
| CN107012317A (en) * | 2016-01-27 | 2017-08-04 | 鞍钢股份有限公司 | A kind of vast scale uses the sintering operation method of limonite |
| CN108070713B (en) * | 2016-11-10 | 2020-03-27 | 宝山钢铁股份有限公司 | Iron ore sintering method using light-burned magnesium balls |
| CN107460310A (en) * | 2017-08-09 | 2017-12-12 | 包头钢铁（集团）有限责任公司 | A kind of method for preparing sintering deposit |
| CN109423555B (en) * | 2017-08-23 | 2020-10-27 | 宝山钢铁股份有限公司 | Efficient iron ore sintering method using low-silicon iron fine powder |
| CN116179846A (en) * | 2023-01-29 | 2023-05-30 | 中天钢铁集团(南通)有限公司 | Pellet production method with high proportion of hematite |
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| JPH0525556A (en) * | 1991-04-24 | 1993-02-02 | Sumitomo Metal Ind Ltd | Production of sintered ore |
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