CN101928824B - Sinter production method for reducing sintering solid burnup and enhancing intensity - Google Patents
Sinter production method for reducing sintering solid burnup and enhancing intensity Download PDFInfo
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- CN101928824B CN101928824B CN 200910012228 CN200910012228A CN101928824B CN 101928824 B CN101928824 B CN 101928824B CN 200910012228 CN200910012228 CN 200910012228 CN 200910012228 A CN200910012228 A CN 200910012228A CN 101928824 B CN101928824 B CN 101928824B
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Abstract
The invention provides a sinter production method for reducing sintering solid burnup and enhancing intensity, which comprises the steps of preparing materials, mixing and pelletizing, distributing materials and sintering. The sinter production method is characterized in that coke powder for sintering is pulverized and prescreened before material preparation; the coke powder is screened into 4 granularity levels: the granularity level less than 1mm, the granularity level of 1 to 3mm, the granularity level of 3 to 5mm and the granularity level larger than 5mm, mixed according to the weight percentages of 55% to 59% of the granularity level less than 1mm, 23% to 27% of the granularity level of 1 to 3mm, 9% to 13% of the granularity level of 3 to 5mm and 4% to 8% of the granularity level larger than 5mm and then prepared with other raw materials. The sinter production method can promote solid fuels to be reasonably burned in the process of sintering; the mineralization processes of iron ores, fusing agents and fuels are reasonable; the sinter intensity is remarkably enhanced; and the sinter solid burnup is obviously reduced. An experiment indicates that the sintering tumbler strength is enhanced by 1.26%, the solid burnup is reduced by 1.89kg/t and the finished product ratio is enhanced by 4.28% than that of the prior art.
Description
Technical field
The invention belongs to the sintering technology field, particularly the blast furnace ironmaking production method of agglomerate.
Background technology
Existing agglomerate production process is: with ready fine iron breeze, rich ore powder, blast furnace dirt, roll scale and Wingdale, rhombspar and coke powder or pulverized anthracite, carry out mixing and granulation in delivering to mixing machine after the ratio cooperation of calculating; Mixed material is taped against the sintering of lighting a fire on the chassis by distributor.Burned agglomerate is broken through the tail single roll crusher, send the cooler cooling after screening again.Cooled finished product agglomerate is sent to blast furnace.
The used solid fuel of sintering is coke powder or hard coal, and it enters the common 0～25mm of factory's fuel.And sintering process is that 0～3mm should account for more than 80%～85% to its granularity requirements.Therefore to carry out fuel crushing.Fuel crushing is to guarantee that sintering process requires indispensable operation to fuel physical properties (granularity).The crushing process principle of sintering fuel adopts one section open type fragmentation, namely carries out precrushing with roll crusher before four-roller crusher, improves the four-roller crusher ability.The crushing process flow process can use fuel granularity 0～3mm to account for more than 80%～85%, and coke powder is not sieved.
During agglomeration for iron mine was produced, the proportion that solid fuel consumption accounts in the sintering circuit energy consumption was very high, reaches 75%～80%, reduced process energy consumption and at first will reduce solid-fuelled consumption.Whether solid-fuelled granularity rationally is one of principal element that affects solid fuel consumption, and fuel granularity has very large impact to the agglomerate quality simultaneously.
Existing sintering solid fuel (coke powder or coal dust) pretreatment process is: solid fuel is carried out the precrushing screening, and general control must not be less than 85% or 90% at 0～3mm particle size fraction." China metallurgical " o. 11th (the 15th volume) in 2005 15～16 pages " Handan Iron and Steel Co is optimized the analysis of fuel grade and put into practice " has been reported Handan Iron and Steel Co sintering fuel granularity to the effect of SINTERING PRODUCTION and affect three kinds of principal elements of fuel grade optimization, and must be at 0～3mm according to producing actual proposition fuel granularity, qualification rate must be controlled at more than 85%, wherein requiring 0～1mm and 1～2mm grain size content should be good greater than 34% all, and 2～3mm content should be more than 17%." Handan Iron and Steel Co is optimized the analysis of fuel grade and put into practice " only provides the lower value of respectively segmenting particle size fraction content, and each particle size fraction is not all provided suitable percentage composition.Technical description such as " 2～3mm content should more than 17% " is fuzzyyer, laboratory experiment shows, 2～3mm content too much has very large disadvantageous effect to the sinter output and quality index on the contrary, and therefore the description of " 2～3mm content should more than 17% " is unscientific; In like manner, for " 0～1mm and 1～2mm grain size content should greater than 34% for good " also exist greater than 34% what be good problem because after 0～1mm and 1～2mm grain size content acquired a certain degree, the sinter output and quality index began variation.
In a word, because prior art is to respectively segmenting granularity (＜1mm particle size fraction in the sintering fuel, 1～3mm particle size fraction, 3～5mm particle size fraction and＞the 5mm particle size fraction) account for how many ratios of fuel for best unclear, the rational proportion that can not direct quantitative provides each grade in best fuel granularity scope and the fuel, can only adjust to change crusher outlet fuel granularity to sintering crushing machine working condition according to SINTERING PRODUCTION experience separately in the production, this extensive granularity control method causes the burning of sintering solid fuel in sinter bed unreasonable, to the sintering mineral products, the improvement of quality index has a negative impact.
Summary of the invention
The object of the invention is to overcome existing deficiency in the above-mentioned prior art, provide a kind of and reduce sintering solid burnup by the reasonable adjustment to the shared proportioning of each grade in the fuel, can improve again the sinter production method of sinter strength.
The present invention is achieved in that this reduction sintering solid burnup, carry high-intensity sinter production method and comprise batching, mixing granulation, cloth and sintering, be characterized in before the batching sintering coke powder being carried out the pre-screening of fragmentation, sieve out 4 particle size fractions, comprise＜the 1mm particle size fraction, 1～3mm particle size fraction, 3～5mm particle size fraction and＞the 5mm particle size fraction, and account for 55%～59% (being preferably 56%～58%) by＜1mm particle size fraction, 1～3mm particle size fraction accounts for 23%～27% (being preferably 24%～26%), 3～5mm particle size fraction accounts for 9%～13% (being preferably 10%～12%), the weight percent that＞5mm particle size fraction accounts for 4%～8% (being preferably 5%～7%) mixes, and then and fine iron breeze, rich ore powder, blast furnace dirt, roll scale, Wingdale, other raw material mix such as unslaked lime.The inventive method is applicable to all iron ore sintering production processes.
Adopt technical solution of the present invention can impel solid fuel (coke powder) mineralisation process of Reasonable Combustion, iron ore and flux and fuel in sintering process reasonable, sinter strength significantly improves, and sintering solid burnup obviously descends.The sintering cup test result shows through the laboratory: adopt solid fuel of the present invention to carry out first the broken mode that each particle size fraction is allocated into again of sieving out in advance before the raw materials for sintering mixed once, sintered ore rotary drum strength improves 1.26 percentage points, solid burnup reduces 1.89kg/t, and yield rate improves 4.28 percentage points.
Description of drawings
Accompanying drawing 1 is existing sintering process process synoptic diagram.
Accompanying drawing 2 is the technological process synoptic diagram of technical solution of the present invention.
Embodiment
The present invention is further described by the following embodiment.
The embodiment of the invention is take sintering cup test as example, and testing used crude fuel and flux all is that present SINTERING PRODUCTION is used, and its chemical ingredients is listed in table 1, and the sintering cup test condition sees Table 2.The size composition of embodiment of the invention coke powder and existing Comparative Examples coke powder sees Table 3.Wherein existing Comparative Examples coke powder is the coke powder of the granularity NATURAL DISTRIBUTION of current existing art breading, and embodiment of the invention coke powder is the rational coke powder of each grain grade proportion of processing through the precrushing screening.The used various iron charge proportionings of inventive embodiments and existing Comparative Examples and sintering condition etc. are all consistent in the test, only changed the shared weight percent of each granularity in the coke powder, and the fixed carbon content of compound equate.Sinter basicity is designed to 2.20 times, and MgO is 2.0%.Bed thickness 700mm (containing the about 20mm of grate-layer material 2kg).The processing of agglutinating test program and sinter cake and the method for calculation of index are all pressed set standard and are carried out.The agglutinating test result of the embodiment of the invention and existing Comparative Examples relatively sees Table 4.
Table 1 embodiment of the invention crude fuel chemical ingredients and ratio of components (wt%)
Table 2 embodiment of the invention sintering cup test condition
Table 3 embodiment of the invention coke powder and existing Comparative Examples coke fines size form (wt%)
The agglutinating test result of table 4 embodiment of the invention coke powder and existing Comparative Examples relatively
By as seen from Table 4, when coke fines size consist of＜1mm accounts for 55%～59%, 1～3mm accounts for 23%～27%, 3～5mm accounts for 9%～13%,＞when 5mm accounts for 4%～8%, by the sintering technology and economic indicator of the coke powder method of embodiment and Comparative Examples art breading as seen: the embodiment sintered ore rotary drum strength improves 1.26 percentage points, solid burnup reduces 1.89kg/t, and yield rate improves 4.28 percentage points.Coke fines size by technical solution of the present invention in SINTERING PRODUCTION forms tissue production to improving the agglomerate cold strength, improves output, reduces sintering solid fuel consumption, and it is very favourable reducing the sintering circuit energy consumption.
Claims (2)
1. one kind is reduced sintering solid burnup, carry high-intensity sinter production method, comprise batching, mixing granulation, cloth and sintering, it is characterized in that before the batching sintering coke powder being carried out the pre-screening of fragmentation, sieve out 4 particle size fractions, comprise＜the 1mm particle size fraction, 〉=1mm and＜the 3mm particle size fraction, 〉=3mm and≤the 5mm particle size fraction and＞the 5mm particle size fraction, and account for 55%～59% by＜1mm particle size fraction, 〉=1mm and＜the 3mm particle size fraction accounts for 23%～27%, 〉=3mm and≤the 5mm particle size fraction accounts for 9%～13%,＞5mm particle size fraction accounts for 4%～8% weight percent mix after again with other raw material mix.
2. sinter production method according to claim 1 is characterized in that the shared weight percent of each particle size fraction is:＜1mm particle size fraction accounts for 56%～58%, 〉=1mm and＜the 3mm particle size fraction accounts for 24%～26%, 〉=3mm and≤the 5mm particle size fraction accounts for 10%～12%,＞the 5mm particle size fraction accounts for 5%～7%.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109112294A (en) * | 2017-06-26 | 2019-01-01 | 宝山钢铁股份有限公司 | A method of it improving sinter reproducibility and reduces fuel consumption |
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| AU2013236700B2 (en) * | 2012-03-22 | 2015-04-23 | Jfe Steel Corporation | Method for adjusting precursor powder for sintered ore, and precursor powder for sintered ore |
| KR101525067B1 (en) * | 2012-03-22 | 2015-06-02 | 제이에프이 스틸 가부시키가이샤 | Method for adjusting precursor powder for sintered ore, and precursor powder for sintered ore |
| CN105296746B (en) * | 2014-07-30 | 2017-09-22 | 宝山钢铁股份有限公司 | A kind of method for reducing sintering solid burnup |
| CN106282543B (en) * | 2015-05-28 | 2018-08-31 | 鞍钢股份有限公司 | A method of improving RDI of Sinter |
| CN105087906B (en) * | 2015-08-27 | 2017-07-21 | 中南大学 | A kind of Ore Sintering Process NOXThe method of emission reduction |
| CN106090978B (en) * | 2016-06-23 | 2018-07-31 | 山东钢铁股份有限公司 | A kind of method improving solid fuel utilization rate and its application in sinter production |
| CN106939373B (en) * | 2017-02-23 | 2019-02-01 | 首钢京唐钢铁联合有限责任公司 | A kind of control method of sintering fuel granularity |
| CN108004392B (en) * | 2018-02-08 | 2024-02-23 | 山东钢铁股份有限公司 | Sintering equipment and process for reducing burning up of sintered solid |
| CN110142095B (en) * | 2018-02-12 | 2021-08-27 | 中冶长天国际工程有限责任公司 | Intelligent control method and device for sintering fuel crushing |
| CN108754131B (en) * | 2018-06-14 | 2020-02-18 | 鞍钢股份有限公司 | Sintering production method for optimizing fuel matching |
| CN111471852B (en) * | 2020-06-16 | 2021-10-01 | 武汉钢铁有限公司 | Method for sintering waste activated carbon powder, sintering mixture and sintered ore |
| CN114350936A (en) * | 2021-12-15 | 2022-04-15 | 包头钢铁（集团）有限责任公司 | Method for reducing sintering solid fuel consumption by controlling fuel granularity |
| CN116875798A (en) * | 2023-09-09 | 2023-10-13 | 吕梁建龙实业有限公司 | Iron ore sintering optimization method |
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| CN1891837B (en) * | 2005-07-04 | 2010-04-07 | 中冶长天国际工程有限责任公司 | Mineral raw material sintering process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109112294A (en) * | 2017-06-26 | 2019-01-01 | 宝山钢铁股份有限公司 | A method of it improving sinter reproducibility and reduces fuel consumption |
| CN109112294B (en) * | 2017-06-26 | 2020-06-23 | 宝山钢铁股份有限公司 | Method for improving reducibility of sinter and reducing fuel consumption |
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