CN102899482A - Isothermal sintering process of iron ore powder - Google Patents
Isothermal sintering process of iron ore powder Download PDFInfo
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- CN102899482A CN102899482A CN2012103789744A CN201210378974A CN102899482A CN 102899482 A CN102899482 A CN 102899482A CN 2012103789744 A CN2012103789744 A CN 2012103789744A CN 201210378974 A CN201210378974 A CN 201210378974A CN 102899482 A CN102899482 A CN 102899482A
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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 the metallurgical production system, specifically a kind of powdered iron ore soaking SINTERING TECHNOLOGY.
Background technology
Iron ore powder sintering is the agglomeration operation that the high-quality iron-bearing material is provided for blast furnace ironmaking, CO, CO in the production
2, NO, SO
2The isothermal chamber gas emissions accounts for about 10% of Iron And Steel Industry, and the quantity discharged that reduces the sintered discharge gas percent of greenhouse gases has become the China environmental protection problem demanding prompt solution.Present SINTERING PRODUCTION, using thick bed of material low temperature sintering technology is the technology that extensively adopts in recent years, its principle be exactly according to the 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 the upper strata agglomerate to provide, the Quality and yield that improves agglomerate reduces process energy consumption.
Needed fuel quantity is relatively low in sintering process, calculates by weight the 5-6% that only has total amount, and the very dispersion that distributes.After the bed of material surface ignition, along with the process of down draft sintering, the heat that solid fuel ignition produces in the compound shifts to the bottom from bed of material top, and material layer temperature presents the trend that progressively improves from top to bottom.The auto accumulation heat effect of fuel concentrated combustion and sintering ore bed so that the bed of material more down temperature is higher, heat is more, thermal zone wider.Therefore sintering process is an anisothermal process, and the thickness of the top temperature travelling speed in the sinter bed and zone of combustion has 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 for SINTERING PRODUCTION technique:
1, bed thickness increases, the effect of sintering auto accumulation heat is further strengthened, the material layer lower part heat is superfluous, the hot ventilation property of the bed of material worsens, so that the sinter bed resistance strengthens, vertical sintering speed reduces, and the reducing atmosphere in the sintering process strengthens, and Yin Gaowen superfusion in local sintering ore deposit causes quality deteriorated.
2, after the bed of material thickened, the solid fuel consumption reduced relatively, and the sintering top bed of material causes the sinter strength variation because of shortage of heat, decrease in yield, finished product agglomerate heterogeneity, and production system back powder rate increases, and worsens the SINTERING PRODUCTION processing condition.
In the sinter mixture blending process, need to add certain water yield and come 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 De Taigao or excessively low, must be controlled in the suitable scope.Moisture crosses that ambassador's compound is excessively wet to be become muddy and not only waste fuel but also the ventilation property of the bed of material is degenerated.If the water yield that adds is too small, then the lower convenience at the thick bed of material can produce too high temperature, makes the 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 raw material properties and size composition and definite.Because the compound particle segregation problem that exists in the sintering machine distributing process, so sintered mixture moisture realizes that in the cloth short transverse differentiation distributes, and 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, is chosen the intermediate value that two places need with amount of water, and this selection so that the agglomerate final product quality be greatly affected equally.
Summary of the invention
Purpose of the present invention is exactly the problem that exists for solving prior art, for the unmanageable defective 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 mixing, cloth, igniting, down draft sintering, cooling, whole grain, make the finished product agglomerate, in the sintering machine distributing operation, use atomizing sprayer as sinter mixture with addition of moisture; Described atomizing sprayer comprises a plurality of atomizers that are arranged in the sinter machine, and atomizer is installed in the different positions on the cloth short transverse, and atomizer is communicated with the water source by water-supply line, is provided with water control valve on the water-supply line; On the sintering pallet compound bed of material in, the 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%.
Existing sintering mixing water distribution technique is adopted in position, described compound top layer; After described compound reaches the cloth height of setting on the chassis plane, the atomizer that uses the top layer atomizing sprayer applies outer water distribution the upper surface of igniting forward direction compound and cloth end face are two-way, and according to the difference of described sinter mixture granularity structure, outside water distribution is implemented in the corresponding height position on chassis bed thickness direction, makes compound moisture on the 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.
In chassis cloth process, form atomized water wetting compound by the bottom atomizing sprayer at compound, by the electrically operated valve control atomizing water yield, make chassis middle and lower part mixture moisture content be higher than the upper strata mixture moisture; In the mixture distributor process, along on chassis width and the length direction, obtain more rational raw material, fuel granularity segregation.
Injection direction and the sinter machine inwall of described atomized water atomizing shower nozzle are 10 ° to 90 ° angles, thereby " fringing effect " of control SINTERING PRODUCTION.
" fringing effect " refers to, in compound was packed chassis into, owing to there being the larger temperature difference between chassis baffle plate and the compound, heat exchange occured 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 the chassis edge, cause in the sintering process chassis edge air-flow velocity too fast, do not reach the raw materials for sintering caking temperature required.And because sinter mixture caking solidification shrinkage causes the loose ventilation property of material at chassis edge large, can not form high-temperature liquid-phase, have a strong impact on thereby the quality of agglomerate caused.Before the 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.
Compound top layer atomizing sprayer can adopt different liquid mediums from mixture distributor end face atomizing sprayer in the sintering pallet, operational characteristic according to different raw materials for sintering, add certain auxiliary in the liquid of spray, alleviating the agglomerate harmful element affects blast-furnace smelting.
Beneficial effect of the present invention can draw by such scheme, because according to sintering machine distributing situation and characteristic, by taking the uniform heating process technology, in stub bar, the bottom, the uniform atomized water of surface sprinkling before the roasting, improve the bulk density of compound in the sinter bed, improved solid fuel and hot gas flow conduction efficiency; By vertical sintering speed in the control sintering process, reasonably utilize the auto accumulation heat effect of deep-bed sintering process.Fuel and water dispenser have been solved in the 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 the deep-bed sintering processing condition, suitably improve sinter bed middle and lower part moisture, improve the sinter bed heat exchanger effectiveness, improving the superfluous heat that produces because of " auto accumulation heat " in the sintering process moves down, and cause in the sintering process process, the situation that hot ventilation property worsens appears in compound different heights position, prevent that effectively the 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 the reduction sinter machine tail gas
2, NO, SO
2The purpose of content.
The present invention namely adds certain auxiliary also applicable to the sintering of special ore in the water of spray, such as CaCl etc., carry out in the sintering sintering process and the basic metal reaction, for high fire grate alkali creates conditions.
Can draw thus, the present invention has certain progressive and practicality, and very large popularizing value is arranged.
Description of drawings:
Fig. 1 is sintering process schema among the present invention;
Embodiment:
In order to understand better the present invention, explain in detail embodiments of the present invention below in conjunction with accompanying drawing.
Embodiment: as shown in Figure 1, a kind of powdered iron ore soaking sintering process, operation includes mixing, cloth, igniting, down draft sintering, cooling, whole grain, makes the finished product agglomerate.Emphasis of the present invention improved in the cloth stage, adopted little water distribution quantity in the sintering pallet bed of material, in the cloth mixing process of top.The moisture of original water distribution is 6.0%, uses afterwards atomizing sprayer to add the aliquot water yield in the cloth material process in sinter machine, and the bottom of the bed of material is carried out outside water distribution simultaneously, and the material layer lower part moisture content is raise, and reaches 7.0%.
Concrete atomizing spray mode: described compound reaches the cloth height of setting in the cloth process after, use atomizing sprayer to apply outer water distribution the upper surface of igniting forward direction compound and cloth end face are two-way.And according to the difference of described sinter mixture granularity structure, at compound in chassis cloth process, come wetting compound by the atomizing sprayer that is arranged in the sinter machine, realize outer water distribution, make compound moisture on the chassis short transverse produce differentiation and distribute.Described atomizer is communicated with the water source by water-supply pipe, be provided with water control valve on the water-supply pipe, injection direction and the sinter machine inwall of described atomized water atomizing shower nozzle are 10 ° to 90 ° angles, the outer water distribution at chassis edge is increased, thereby effectively control " fringing effect " of SINTERING PRODUCTION.
Before igniting, at the quantitative atomized water that also sprays equably of the upper surface of the bed of material, improve top layer compound heat storage efficiency, change the defective of deep-bed sintering technique middle and upper part bed of material shortage of heat, keep simultaneously preferably ventilation property of the bottom bed of material.
The atomized water atomizing shower nozzle of spray equipment is being wanted high 5-10% near chassis baffle plate place throughput ratio bed of material middle part.Therefore the moisture of sinter mixture reduce before the pallet of packing into, then quantitatively also evenly spray into a part of water at the whole charge level of igniting forward direction, the disadvantageous effect of can reduce like this in the chassis, the top bed of material is excessively wet, improve the middle and upper part fuel combustion efficiency, can guarantee again bottom macrobead segregation and have preferably ventilation property, increase simultaneously bed of material density, by improving solid-fuelled efficiency of combustion in the bed of material, reach and reduce the energy-saving and emission-reduction of solid burnup realization SINTERING PRODUCTION.
Above-mentioned explanation is not to be limitation of the present invention, and the present invention also is 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 (6)
1. powdered iron ore soaking sintering process, operation include cloth, igniting, down draft sintering, cooling, whole grain, make the finished product agglomerate, it is characterized in that: in the sintering machine distributing operation, use atomizing sprayer as sinter mixture with addition of moisture; Described atomizing sprayer comprises a plurality of atomizers that are arranged in the sinter machine, and atomizer is installed in the different positions on the cloth short transverse, and atomizer is communicated with the water source by water-supply line, is provided with water control valve on the water-supply line; On the sintering pallet compound bed of material in, the 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%.
2. powdered iron ore as claimed in claim 1 is burnt equal thermojunction technique, it is characterized in that: existing sintering mixing water distribution technique is adopted in position, described compound top layer; After described compound reaches the cloth height of setting on the chassis plane, the atomizer that uses the top layer atomizing sprayer applies outer water distribution the upper surface of igniting forward direction compound and cloth end face are two-way, and according to the difference of described sinter mixture granularity structure, outside water distribution is implemented in the corresponding height position on chassis bed thickness direction, makes compound moisture on the chassis short transverse produce differentiation and distributes.
3. powdered iron ore as claimed in claim 2 is burnt equal thermojunction technique, it is characterized in that: described atomizer is at the high 5%-10% in throughput ratio middle part near chassis baffle plate place.
4. powdered iron ore soaking sintering process as claimed in claim 1, it is characterized in that: at compound in chassis cloth process, form the wetting compound of atomized water by the bottom atomizing sprayer, by the electrically operated valve control atomizing water yield, make chassis middle and lower part mixture moisture content be higher than the upper strata mixture moisture.
5. such as claim 2 or 4 described powdered iron ore soaking sintering process, it is characterized in that: injection direction and the sinter machine inwall of described atomized water atomizing shower nozzle are 10 ° to 90 ° angles.
6. powdered iron ore soaking sintering process as claimed in claim 1, it is characterized in that: compound top layer atomizing sprayer can adopt different liquid mediums from mixture distributor end face atomizing sprayer in the sintering pallet, operational characteristic according to different raw materials for sintering, add certain auxiliary in the liquid of spray, alleviating the agglomerate harmful element affects blast-furnace smelting.
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Cited By (11)
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| CN103215442A (en) * | 2013-04-27 | 2013-07-24 | 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 |
| 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 |
| 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 |
| 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 |
| CN104911339A (en) * | 2015-04-24 | 2015-09-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Vanadium titanium sinter and preparation method thereof |
| CN105821205A (en) * | 2015-01-07 | 2016-08-03 | 宝山钢铁股份有限公司 | Processing equipment for sintering mixture and processing 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 |
| CN110129554A (en) * | 2019-06-24 | 2019-08-16 | 马鞍山钢铁股份有限公司 | A kind of sintering back powder mine receiving 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103215442A (en) * | 2013-04-27 | 2013-07-24 | 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 |
| CN105821205A (en) * | 2015-01-07 | 2016-08-03 | 宝山钢铁股份有限公司 | Processing equipment for sintering mixture and processing method thereof |
| 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 |
| 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 |
| 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 |
| CN104911339A (en) * | 2015-04-24 | 2015-09-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Vanadium titanium sinter and preparation method thereof |
| 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 |
| CN110129554A (en) * | 2019-06-24 | 2019-08-16 | 马鞍山钢铁股份有限公司 | A kind of sintering back powder mine receiving processing system |
| 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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Owner name: SHANDONG DEJUN PRECISION MACHINERY CO., LTD. Free format text: FORMER OWNER: LI XINGWEN Effective date: 20140416 Free format text: FORMER OWNER: YANG YANCHAO SONG YANAN LI GENG CHEN HU Effective date: 20140416 |
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