CN102899482B - Isothermal sintering process of iron ore powder - Google Patents
Isothermal sintering process of iron ore powder Download PDFInfo
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- CN102899482B CN102899482B CN201210378974.4A CN201210378974A CN102899482B CN 102899482 B CN102899482 B CN 102899482B CN 201210378974 A CN201210378974 A CN 201210378974A CN 102899482 B CN102899482 B CN 102899482B
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Abstract
The invention, relating to the field of iron ore powder sintering in metallurgy production system, particularly discloses an isothermal sintering process of iron ore powder, comprising uniformly mixing, distributing materials, igniting, sintering by air draft, cooling, and granulating to obtain a finished agglomerate, wherein in the step of distributing materials of a sintering machine, an atomization spray device is used for adding water to the sintering mixture; small water addition is adopted in material distribution of the middle and upper portion of the mixture material layer on the sintering machine, the water content is 6-6.5%; the water content of the lower portion of the material layer is raised by 1.0-2.0%, thus the water content reaches 7-8.5%. According to the invention, under the condition of applying thick material layer sintering technology, the water contents of the middle and lower portions of the sintering material layer are properly raised, the heat exchange efficiency of the sintering material layer is raised, the hot permeability deterioration at different height positions of the mixture in the sintering process is improved, the agglomerate quality deterioration is effectively avoided, the yield and quality of the agglomerate are raised, and the sintering solid burn-up is reduced.
Description
Technical field
The present invention relates to iron ore powder sintering field in metallurgical production system, specifically a kind of powdered iron ore soaking SINTERING TECHNOLOGY.
Background technology
Iron ore powder sintering is that the agglomeration operation of high-quality iron-bearing material, CO, CO in production are provided for blast furnace ironmaking
2, NO, SO
2isothermal chamber gas emissions accounts for 10% left and right of Iron And Steel Industry, and the quantity discharged that reduces sintered discharge gas percent of greenhouse gases has become China environmental protection problem demanding prompt solution.Present SINTERING PRODUCTION, using thick bed of material low temperature sintering technology is the technology extensively adopting in recent years, its principle be exactly according to iron ore powder sintering characteristic and with addition of quantity of fuel, granularity and reactivity thereof, by improving bed thickness, the auto accumulation heat share of utilizing upper strata agglomerate to provide, the Quality and yield that improves agglomerate reduces process energy consumption.
In sintering process, needed fuel quantity is relatively low, calculates by weight the 5-6% that only has total amount, and the very dispersion that distributes.After bed of material surface ignition, along with the process of down draft sintering, the heat that in compound, solid fuel ignition produces shifts to bottom from bed of material top, and material layer temperature presents the trend progressively improving from top to bottom.The auto accumulation heat effect of fuel concentrated combustion and sintering ore bed, more down temperature is higher, heat is more to make the bed of material, thermal zone wider.Therefore sintering process is an anisothermal process, and top temperature travelling speed in sinter bed and the thickness of zone of combustion have great impact to the quality of sintering process and quality product.
Adopt thick bed of material low temperature sintering technology to have corresponding technological deficiency, along with the increase of bed thickness, brought all many-sided problems to SINTERING PRODUCTION technique:
1, bed thickness increases, and the effect of sintering auto accumulation heat is further strengthened, and material layer lower part heat is superfluous, the hot ventilation property of the bed of material worsens, and sinter bed resistance is strengthened, and vertical sintering speed reduces, reducing atmosphere in sintering process strengthens, and Yin Gaowen superfusion in local sintering ore deposit causes quality deteriorated.
2, after the bed of material thickens, solid fuel consumption reduces relatively, and the sintering top bed of material causes sinter strength variation because of shortage of heat, decrease in yield, finished product agglomerate heterogeneity, and production system back powder rate increases, and worsens SINTERING PRODUCTION processing condition.
In sinter mixture blending process, need to add certain water yield to carry out controlling moisture, improve the heat condition of raw materials for sintering.From thermally equilibrated angle, removing moisture needs again to consume a part of heat, is disadvantageous one side, so sintered material moisture can not be controlled get Tai Gao or too low, must be controlled in suitable scope.Moisture crosses that ambassador's compound is excessively wet to be become muddy and not only waste fuel but also more seriously make the ventilation property of the bed of material degenerate.If the water yield adding is too small, the lower convenience at the thick bed of material can produce too high temperature, makes material layer lower part heat superfluous, and the hot ventilation property of the bed of material worsens, and therefore, the adequate moisture of compound is according to the character of raw material and size composition and definite.Due to the compound particle segregation problem existing in sintering machine distributing process, so sintered mixture moisture realizes differentiation and distributes in cloth short transverse, is only more rational production technique measure.
The thick bed of material low temperature sintering technology technology of taking at present, in order to take into account simultaneously, amount of water is chosen to the intermediate value that two places need, and this selection is greatly affected agglomerate final product quality equally.
Summary of the invention
Object of the present invention, is exactly the problem existing for solving prior art, for the unmanageable defect of deep-bed sintering technique sintering temperature, and has designed a kind of powdered iron ore soaking sintering process, improves sintering quality, and reaches the effect of energy-saving and emission-reduction.
Technical scheme of the present invention is: a kind of powdered iron ore soaking sintering process, operation includes and mixes, cloth, igniting, down draft sintering, cooling, whole grain, make finished product agglomerate, in sintering machine distributing operation, use atomizing sprayer for sinter mixture is with addition of moisture; Described atomizing sprayer comprises a plurality of atomizers that are arranged in sinter machine, and atomizer is arranged on the different positions in cloth short transverse, and atomizer is communicated with water source by water-supply line, is provided with water control valve on water-supply line; On sintering pallet the compound bed of material in, top cloth adopts little water distribution quantity, moisture is 6%～6.5%, the bottom moisture content of the bed of material improves 1.0%～2.0%, makes moisture content reach 7%～8.5%.
Position, described compound top layer adopts existing sintering to mix water distribution technique; Described compound reaches after the cloth height of setting in chassis plane, the atomizer that uses top layer atomizing sprayer is at the upper surface of igniting forward direction compound and cloth end face is two-way applies outer water distribution, and according to the difference of described sinter mixture granularity structure, in chassis bed thickness direction, outside water distribution is implemented in corresponding height position, makes compound moisture in chassis short transverse produce differentiation and distributes.
Described atomizer is at the high 5%-10% in throughput ratio middle part near chassis baffle plate place.
At compound, in chassis cloth process, by bottom atomizing sprayer, form atomized water and soak compound, by electrically operated valve, control the atomization water yield; In mixture distributor process, along on chassis width and length direction, obtain more rational raw material, fuel granularity segregation.
The injection direction of described atomized water atomization shower nozzle and sinter machine inwall are 10 ° to 90 ° angles, thereby control " fringing effect " of SINTERING PRODUCTION.
" fringing effect " refers to, at compound, packs in chassis, and owing to there is the larger temperature difference between chassis baffle plate and compound, heat exchange occurs in advance for compound and the chassis baffle plate at close chassis edge, and moisture is reduced.In sintering process, the middle part of chassis and edge moisture maldistribution, a large amount of effective wind pass through from chassis edge, cause in sintering process chassis edge air-flow velocity too fast, do not reach raw materials for sintering caking temperature required.And due to sinter mixture caking solidification shrinkage, cause the loose ventilation property of material at chassis edge large, can not form high-temperature liquid-phase, thereby the quality of agglomerate is caused and had a strong impact on.Before sinter mixture inlet point firearm, owing to being subject to the impact of burner hearth hyperthermia radiation, trolley surface moisture evaporates in advance, and then affects ignition effectiveness.
In sintering pallet, compound top layer atomizing sprayer can adopt different liquid mediums from mixture distributor end face atomizing sprayer, according to the operational characteristic of different raw materials for sintering, in the liquid of spray, add certain auxiliary, alleviating agglomerate harmful element affects blast-furnace smelting.
Beneficial effect of the present invention can draw by such scheme, due to according to sintering machine distributing situation and characteristic, by taking uniform heating process technology, in stub bar, bottom, the uniform atomized water of surface sprinkling before roasting, improve the bulk density of compound in sinter bed, improved solid fuel and hot gas flow conduction efficiency; By controlling vertical sintering speed in sintering process, reasonably utilize the auto accumulation heat effect of deep-bed sintering process.Fuel and water dispenser have been solved in thick bed of material low temperature sintering technology technology in thick material layer lower part auto accumulation heat excess Temperature, sintering top shortage of heat and the thick bed of material than the Three Difficult Issues that are difficult to average.
The present invention is implementing under deep-bed sintering processing condition, suitably improve sinter bed middle and lower part moisture, improve sinter bed heat exchanger effectiveness, improving the superfluous heat producing because of " auto accumulation heat " in sintering process moves down, and cause in sintering process process, in compound different heights position, there is the situation that hot ventilation property worsens, effectively prevent that agglomerate quality in kind from worsening, improve output and the quality of agglomerate, reduce sintering solid burnup, and then reach gas pollutant CO, CO in reduction sinter machine tail gas
2, NO, SO
2the object of content.
The present invention, also applicable to the sintering of special ore, adds certain auxiliary in the water of spray, as CaCl etc., carries out in sintering sintering process reacting with basic metal, for high fire grate alkali creates conditions.
Can draw thus, the present invention has certain progressive and practicality, has very large popularizing value.
accompanying drawing explanation:
Fig. 1 is sintering process schema in the present invention;
embodiment:
In order to understand better the present invention, below in conjunction with accompanying drawing, explain in detail embodiments of the present invention.
Embodiment: as shown in Figure 1, a kind of powdered iron ore soaking sintering process, operation includes and mixes, cloth, igniting, down draft sintering, cooling, whole grain, makes finished product agglomerate.Emphasis of the present invention improved in the cloth stage, in the sintering pallet bed of material, in the cloth mixing process of top, adopted little water distribution quantity.The moisture of original water distribution is 6.0%, uses afterwards atomizing sprayer in sinter machine, to add the aliquot water yield in cloth material process, and outside water distribution is carried out in the bottom of the bed of material simultaneously, and material layer lower part moisture content is raise, and reaches 7.0%.
Concrete atomizing spray mode: described compound reaches after the cloth height of setting in cloth process, is used atomizing sprayer at the upper surface of igniting forward direction compound and cloth end face is two-way applies outer water distribution.And according to the difference of described sinter mixture granularity structure, at compound in chassis cloth process, by the atomizing sprayer being arranged in sinter machine, soak compound, realize outer water distribution, make compound moisture in chassis short transverse produce differentiation and distribute.Described atomizer is communicated with water source by water-supply pipe, on water-supply pipe, be provided with water control valve, the injection direction of described atomized water atomization shower nozzle and sinter machine inwall are 10 ° to 90 ° angles, and the outer water distribution at chassis edge is increased, thereby effectively control " fringing effect " of SINTERING PRODUCTION.
Before igniting, the quantitative atomized water that also sprays equably of upper surface at the bed of material, improves top layer compound heat storage efficiency, changes the defect of deep-bed sintering technique middle and upper part bed of material shortage of heat, keeps the good ventilation property of the bottom bed of material simultaneously.
The atomized water atomization shower nozzle of spray equipment is being wanted high 5-10% near throughput ratio bed of material middle part, chassis baffle plate place.Therefore the moisture of sinter mixture was reduced before packing pallet into as far as possible, then at the whole charge level of igniting forward direction, quantitatively also evenly spray into a part of water, the disadvantageous effect of can reduce like this in chassis, the top bed of material is excessively wet, improve middle and upper part fuel combustion efficiency, can guarantee again bottom macrobead segregation and there is good ventilation property, increase bed of material density simultaneously, by improving solid-fuelled efficiency of combustion in the bed of material, reach reduction solid burnup and realize SINTERING PRODUCTION energy-saving and emission-reduction.
Above-mentioned explanation is not limitation of the present invention, and the present invention is also not limited in above-mentioned giving an example, and the variation that those skilled in the art make in essential scope of the present invention, remodeling, interpolation or replacement, also should belong to protection scope of the present invention.
Claims (3)
1. a powdered iron ore soaking sintering process, operation includes cloth, igniting, down draft sintering, cooling, whole grain, makes finished product agglomerate, it is characterized in that: in sintering machine distributing operation, use atomizing sprayer for sinter mixture is with addition of moisture; Described atomizing sprayer comprises a plurality of atomizers that are arranged in sinter machine, and atomizer is arranged on the different positions in cloth short transverse, and atomizer is communicated with water source by water-supply line, is provided with water control valve on water-supply line; On sintering pallet the compound bed of material in, top cloth adopts little water distribution quantity, moisture is 6%～6.5%, the bottom moisture content of the bed of material improves 1.0%～2.0%, makes moisture content reach 7%～8.5%; Position, described compound top layer adopts existing sintering to mix water distribution technique; Described compound reaches after the cloth height of setting in chassis plane, the atomizer that uses top layer atomizing sprayer is at the upper surface of igniting forward direction compound and cloth end face is two-way applies outer water distribution, and according to the difference of described sinter mixture granularity structure, in chassis bed thickness direction, outside water distribution is implemented in corresponding height position, makes compound moisture in chassis short transverse produce differentiation and distributes; Described atomizer is at the high 5%-10% in throughput ratio middle part near chassis baffle plate place.
2. powdered iron ore soaking sintering process as claimed in claim 1, is characterized in that: the injection direction of described atomized water atomization shower nozzle and sinter machine inwall are 10 ° to 90 ° angles.
3. powdered iron ore soaking sintering process as claimed in claim 1, it is characterized in that: in sintering pallet, compound top layer atomizing sprayer can adopt different liquid mediums from mixture distributor end face atomizing sprayer, according to the operational characteristic of different raw materials for sintering, in the liquid of spray, add certain auxiliary, alleviating agglomerate harmful element affects blast-furnace smelting.
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| CN103215442B (en) * | 2013-04-27 | 2014-07-02 | 河北钢铁股份有限公司邯郸分公司 | Thick-bed sintering feed surface-spraying covering agent and spraying method thereof |
| CN105821205B (en) * | 2015-01-07 | 2017-11-28 | 宝山钢铁股份有限公司 | The processing equipment and its processing method of a kind of sinter mixture |
| CN104630455A (en) * | 2015-02-06 | 2015-05-20 | 铜陵百荣新型材料铸件有限公司 | Manganese mineral powder sintering process |
| CN104630452A (en) * | 2015-02-06 | 2015-05-20 | 铜陵百荣新型材料铸件有限公司 | Sintering method for preparing boron ore powder |
| CN104630454A (en) * | 2015-02-06 | 2015-05-20 | 铜陵百荣新型材料铸件有限公司 | Ground phosphorite sintering technique |
| CN104630460A (en) * | 2015-02-06 | 2015-05-20 | 铜陵百荣新型材料铸件有限公司 | Sintering method for preparing iron ore powder |
| CN104911339B (en) * | 2015-04-24 | 2017-06-30 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of vanadium titanium sintering deposit and preparation method thereof |
| CN106119527A (en) * | 2016-08-29 | 2016-11-16 | 山东钢铁股份有限公司 | A kind of atomizer and sintering mixer |
| CN108546821A (en) * | 2018-05-09 | 2018-09-18 | 攀钢集团攀枝花钢钒有限公司 | Sinter mixture humidification igniting sintering method |
| CN110129554B (en) * | 2019-06-24 | 2024-02-20 | 马鞍山钢铁股份有限公司 | Sintering return powder ore receiving and processing system |
| CN114543529A (en) * | 2022-03-08 | 2022-05-27 | 石横特钢集团有限公司 | Material distribution method of sintering machine |
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