CN117563497A - Sintering batching method - Google Patents
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- 238000005245 sintering Methods 0.000 title claims abstract description 115
- 238000000034 method Methods 0.000 title claims abstract description 48
- 239000000203 mixture Substances 0.000 claims abstract description 173
- 239000000463 material Substances 0.000 claims abstract description 66
- 238000002156 mixing Methods 0.000 claims abstract description 32
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052742 iron Inorganic materials 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 239000002245 particle Substances 0.000 claims description 9
- 239000000446 fuel Substances 0.000 claims description 7
- 230000004907 flux Effects 0.000 claims description 5
- 239000007858 starting material Substances 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 25
- 229910052799 carbon Inorganic materials 0.000 abstract description 25
- 238000004519 manufacturing process Methods 0.000 abstract description 19
- 230000008569 process Effects 0.000 abstract description 12
- 239000000843 powder Substances 0.000 abstract description 11
- 230000001105 regulatory effect Effects 0.000 abstract description 7
- 239000002994 raw material Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 description 5
- 239000011707 mineral Substances 0.000 description 5
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000001603 reducing effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- -1 flux Substances 0.000 description 3
- 238000005453 pelletization Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000005469 granulation Methods 0.000 description 2
- 230000003179 granulation Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/80—Forming a predetermined ratio of the substances to be mixed
- B01F35/83—Forming a predetermined ratio of the substances to be mixed by controlling the ratio of two or more flows, e.g. using flow sensing or flow controlling devices
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Geochemistry & Mineralogy (AREA)
- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention relates to the technical field of iron ore powder sintering, in particular to a sintering batching method. The method comprises the steps of transporting each initial material into a primary batching chamber for primary batching to form a primary mixture; conveying the primary mixture, the sintered return ores and the blast furnace return ores into a secondary batching room for secondary batching, and uniformly mixing to form a secondary mixture; the secondary mixture is mixed and granulated to produce sintered ore. The sintering batching method comprises a twice batching process, wherein each initial material is batched for the first time to form a primary mixture, the primary mixture is batched with sintering return ores and blast furnace return ores to form a secondary mixture, and the sintering return ores and the blast furnace return ores contain carbon, so that in the sintering production process, when the proportion of carbon needs to be regulated, the proportion of the sintering return ores and the blast furnace return ores in the secondary batching can be directly regulated, the proportion of the carbon is changed, and the primary proportion does not need to be regulated.
Description
Technical Field
The invention relates to the technical field of iron ore powder sintering, in particular to a sintering batching method.
Background
Iron ore powder sintering is a agglomeration process widely used by the iron and steel industry, and the main purpose of the iron ore powder sintering is to provide high-quality furnace burden for blast furnace ironmaking. The high-grade mineral powder obtained by mineral separation of low-grade iron ore resources can be realized through sintering of iron ore powder, industrial solid waste and sundries such as gas ash, dust removal ash, high return, self return, skin rolling and the like can be recycled, and the furnace burden which has certain granularity, high grade and good strength and meets the smelting requirement of a blast furnace can be prepared, so that the stability of sintered ore is improved, the environmental pollution is reduced, the environmental protection cost is saved, and the purpose of high-efficiency utilization of resources is realized.
The ore blending is a working procedure of blending various materials together according to a certain proportion according to the quality index requirements, raw material components and raw material storage conditions of the sintered ore. The proper raw material proportion can produce liquid phase with excellent performance, and the proper fuel proportion can obtain sintered ore with high strength and good reducibility. However, the sintering raw materials have complex varieties and large component fluctuation, so that the process needs to control the proportion of the raw materials and the setting of various technological parameters. In the related technology, a one-time batching method is adopted in the sintering production process, however, the parameter adjustment time of the method is long, hysteresis exists, and the fluctuation of parameters of a sintering machine is easy to cause and influence the quality of the sintering ore.
Disclosure of Invention
The application provides a sintering batching method, which solves the technical problems that the parameter adjustment time of the method is longer, hysteresis exists, the fluctuation of parameters of a sintering machine is easy to cause, and the quality of sintering ores is influenced by adopting a one-time batching method in the sintering production process in the related technology.
The application provides a sintering batching method, which comprises the following steps:
transporting each initial material into a primary batching chamber for primary batching to form primary mixed materials;
conveying the primary mixture, the sintered return ores and the blast furnace return ores into a secondary batching room for secondary batching, and uniformly mixing to form a secondary mixture;
and mixing and granulating the secondary mixture to generate sintered ore.
In some embodiments, the transporting the primary mix, sintered return ore, and blast furnace return ore to a secondary batching chamber for secondary batching and mixing uniformly to form a secondary mix comprises:
setting the proportion and the material layer of the primary mixture, the sintered return ores and the blast furnace return ores respectively;
respectively obtaining the batching amounts of the primary mixture, the sintered return ores and the blast furnace return ores according to the proportion and the material layers;
and conveying the primary mixture, the sintered return ores and the blast furnace return ores into a secondary mixer according to respective proportioning, and adding water into the secondary mixer to uniformly mix the primary mixture, the sintered return ores and the blast furnace return ores with the water to form a secondary mixture.
In some embodiments, in the step of obtaining the batching amounts of the primary mix, the sintered return and the blast furnace return according to the proportioning and the material layers, respectively, the batching amounts of the primary mix, the sintered return and the blast furnace return are calculated according to the following formula:
F(t/h)＝t(kg/m)×v(m/s)×3600(s/h)/1000(kg/t)×n
wherein: f is the batching amount of the first mixture, the batching amount of the sintering return ore or the batching amount of the blast furnace return ore, t is the material layer of the first mixture, the material layer of the sintering return ore or the material layer of the blast furnace return ore, v is the belt conveying speed, and n is the proportion of the first mixture, the proportion of the sintering return ore or the proportion of the blast furnace return ore.
In some embodiments, the transporting the primary mix, sintered return ore, and blast furnace return ore to a secondary batching chamber for secondary batching and mixing uniformly to form a secondary mix comprises:
setting the feeding amount and the respective proportions of the primary mixture, the sintered return ores and the blast furnace return ores;
respectively obtaining the batching amounts of the primary mixture, the sintered return ores and the blast furnace return ores according to the feeding amount and the proportion;
and conveying the primary mixture, the sintered return ores and the blast furnace return ores into a secondary mixer according to respective proportioning, and adding water into the secondary mixer to uniformly mix the primary mixture, the sintered return ores and the blast furnace return ores with the water to form a secondary mixture.
In some embodiments, in the step of obtaining the batch amounts of the primary mix, the sintered return ore, and the blast furnace return ore according to the feeding amount and the proportioning, the batch amounts of the primary mix, the sintered return ore, and the blast furnace return ore are calculated according to the following formula:
F(t/h)＝f(t/h)×n
wherein: f is the batching amount of the primary mixture, the batching amount of the sintering return ore or the batching amount of the blast furnace return ore, F is the feeding amount, and n is the proportion of the primary mixture, the proportion of the sintering return ore or the proportion of the blast furnace return ore.
In some embodiments, the primary mix has a ratio of 70% and the blast furnace return and the sinter return have a ratio of 30% in total.
In some embodiments, the step of transporting each of the initial materials into the primary batching chamber for primary batching, after forming the primary mix, comprises:
transporting the primary mixture to a vertical mixer, and adding blast furnace return ores into the vertical mixer to uniformly mix the primary mixture and the blast furnace return ores; wherein, the batching amount of the blast furnace return ore is smaller than that of the primary mixture;
adding water into the vertical mixer to uniformly mix the primary mixture, the blast furnace return ores and the water;
the primary mix is transported to an intermediate bin.
In some embodiments, the primary mixture is transported to a vertical mixer, and blast furnace return ore is added into the vertical mixer, so that the primary mixture and the blast furnace return ore are uniformly mixed, wherein the ratio of the primary mixture to the blast furnace return ore is 9:1.
in some embodiments, the sintered return and the blast furnace return have a particle size of less than 6mm.
In some embodiments, the starting materials include iron ore fines, fluxes, and fuels.
The beneficial effects of the application are as follows:
the sintering batching method comprises a twice batching process, wherein each initial material is batched for the first time to form a primary mixture, the primary mixture is batched with sintering return ores and blast furnace return ores to form a secondary batch, and the sintering return ores and the blast furnace return ores contain carbon, so that in the sintering production process, when the proportion of carbon needs to be regulated, the proportion of the sintering return ores and the blast furnace return ores in the secondary batch can be directly regulated, the proportion of the carbon is changed, the primary proportion does not need to be regulated, the carbon proportioning regulation time is greatly shortened, the material consumption fluctuation is reduced, and the smooth and steady operation of the sintering machine is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention.
FIG. 1 is a schematic flow chart of a sintering batching method according to the present embodiment;
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all the directional indicators in the embodiments of the present invention are only used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture, and if the specific posture is changed, the directional indicators are correspondingly changed.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The sintering production process is to mix iron ore powder, flux, fuel and other supplementary material in certain proportion, then mix with part of return ore sieved by sintering machine tail and blast furnace return ore, send to mixer to mix and pelletize. The mixture is spread on a sintering machine trolley by a distributing device for ignition sintering, sintered sinter is crushed and screened by a crusher, finished sinter on a screen is sent to a blast furnace, the undersize is blast furnace return, and the blast furnace return is matched with the mixture for re-sintering.
In the related art, a one-time batching method is adopted in the sintering production process, namely, each material is batched at one time, and each material is batched according to a preset proportion, so that the produced sintering meets the requirement of carbon content. However, in actual production of sintering, due to the influences of raw material stock conditions, raw material quality indexes, sintering ore quality indexes, sintering parameters and the like, the material quantity of a batching chamber needs to be frequently adjusted, if the set flow rates of the blast furnace return ores and the sintering return ores are calculated based on primary batching, the material quantity of the blast furnace return ores and the sintering return ores is kept unchanged in the process of adjusting the material quantity, the material quantity of the mixture is frequently adjusted, actual carbon content can be frequently changed, the fuel ratio needs to be timely adjusted at the moment, and the operation adjustment of the corresponding sintering machine should be carried out before the material ratio is adjusted to the sintering machine, however, the parameter adjustment time of the primary batching method is longer, hysteresis exists, and the parameter fluctuation of the sintering machine is easy to cause and the quality of the sintering ores is influenced.
In order to solve the problems in the related art to a certain extent, the embodiment of the application provides a sintering batching method, when the proportion of carbon needs to be adjusted, the proportion of sintering return ores and blast furnace return ores in secondary batching can be directly adjusted to change the proportion of carbon, the primary proportion does not need to be adjusted, the carbon proportioning adjustment time is greatly shortened, the material consumption fluctuation is reduced, and the smooth and steady operation of a sintering machine is realized.
The present application is described below with reference to specific embodiments in conjunction with the accompanying drawings:
with reference to fig. 1, an embodiment of the present application provides a sintering batching method, including:
s1: and transporting each initial material to a primary batching chamber for primary batching to form a primary mixture.
The initial material includes iron ore powder, flux, fuel, etc. and the material compounding process includes setting the mixture ratio of various materials manually and controlling the feeding amount of the material quantitatively. When the initial materials are transported, the materials such as iron ore powder, flux, fuel and the like in a material yard are respectively transported to a belt by a bucket wheel of a stacker-reclaimer to be stored in a storage bin by belt transportation, and then are transported by a plurality of belts, and the operations such as the trolley on the bin to the bin and the like are input into a specified bin of a batching room.
S2: transporting the primary mixture into a vertical mixer, and adding blast furnace return ores into the vertical mixer to uniformly mix the primary mixture and the blast furnace return ores; wherein, the batching amount of the blast furnace return ore is smaller than that of the primary mixture; adding water into the vertical mixer to uniformly mix the primary mixture, the blast furnace return ores and the water; the primary mix is transported to an intermediate bin.
In the metallurgical sintering production process, the mixing bin of the sintering machine is an important device for sintering production, and plays a role in supporting the sintering production. The continuous sintering device maintains the continuity of sintering production, and plays a role of an intermediate bin for continuously conveying sintering materials. In recent years, along with the change of a mineral preparation structure, the proportion of lime to magnetic refined powder in a sintering mixture is increased, and in the mixing process of the sintering mixture, the mixture is often subjected to moisture wetting for the first time, so that the mixture is stuck to a lining plate and a discharge hole of a middle bin due to the fact that the size of the mixture is too small, and the occurrence of sticking and blocking is caused, so that the smooth and stable operation of sintering production is influenced. And along with the increase of the thickness of the adhesive material, the effective volume of the intermediate bin is reduced, the material mixing is affected, the granulating effect is deteriorated, and accident shutdown is caused by excessive choking during severe conditions. The intermediate bin binder directly affects the mixing granulation effect of the mixer and the service life of equipment, thereby adversely affecting the alkalinity stability of the sinter and the utilization coefficient of the sinter, and seriously affecting the sintering yield, quality and production organization.
Therefore, in the step, the primary mixture is mixed with a small amount of blast furnace return ores, and the particle size of the blast furnace return ores is larger, so that after the primary mixture is mixed with the blast furnace return ores, the average particle size is increased, the particle size trend of the mixture is good, the proportion of fine particles with the particle size smaller than 3mm is reduced, and the subsequent granulating process is facilitated. The characteristic of large return ore size is utilized to wash the middle bin barrel, so that the occurrence probability of primary mixture sticking on the lining plate and the times of blocking the blanking opening of the middle bin are reduced, and the viscosity reducing effect is realized. The method can effectively reduce the problem of sticking materials of the middle bin barrel of the mixture, reduce the frequency of manual cleaning and overhaul, ensure the smooth and steady operation of the sintering machine and improve the sintering production efficiency.
Of course, the effect of the blast furnace return ores is only to realize the viscosity reduction effect, and a small amount of the blast furnace return ores can be added so as not to influence the proportion of the primary mixture. Specifically, in this step, the ratio of the primary mixture to the blast furnace return ore is 9:1.
the function of the intermediate bin: firstly, storing the mixture, and reducing the stopping of a sintering machine; secondly, the middle bin can increase the steam function and improve the material temperature; third, the intermediate bin is provided with an electronic scale, so that accurate metering can be realized, and a secondary batching function is realized. Therefore, the primary mixture needs to be transported into the middle reduction bin before secondary proportioning, and because the primary mixture is mixed with a small amount of blast furnace return ore before the step, the phenomenon of material dipping in the middle reduction bin can be reduced in the process of transporting the primary mixture into the middle bin, the frequency of manual cleaning and overhaul is reduced, the smooth operation of the sintering machine is ensured, and the sintering production efficiency is improved.
S3: conveying the primary mixture, the sintered return ores and the blast furnace return ores into a secondary batching room for secondary batching, and uniformly mixing to form a secondary mixture;
for sintering with fine powder as main material, adding a certain amount of return ore as the pelletization core is necessary, and the particle size of the sintered return ore and the blast furnace return ore is less than 6mm, so that the mixing and pelletization of the sintering material can be improved. In addition, under the condition of the same granularity, the materials with multiple edges and corners and irregular shapes are easier to granulate than smooth materials. Specifically, the sintered return ore may have a particle size of 5mm and the blast furnace return ore may have a particle size of 4mm.
The mixture ratio of the secondary mixture to the sintered return ores and the blast furnace return ores is fixed, and the mixture amount of the secondary mixture to the sintered return ores and the blast furnace return ores can be calculated based on the material layer or the material loading amount. Specifically, when the blending amounts of the secondary mix and the sintered return ores and the blast furnace return ores are calculated based on the material layers, the steps include:
s31: respectively setting the proportion and the material layer of primary mixture, sintered return ore and blast furnace return ore;
the mixture enters a mineral tank after the mixing granulation process is finished, the mineral tank is fed and paved on a sintering machine, and the feeding thickness is controlled by a main control according to the rotating speed and the position requirement of the sintering machine. Specifically, the material layer is generally 750-800mm.
S32: respectively obtaining the proportioning amount of primary mixture, sintered return ore and blast furnace return ore according to the proportioning and the material layer;
s33: the primary mixture, the sintered return ore and the blast furnace return ore are transported into a secondary mixer according to respective proportioning, and water is added into the secondary mixer, so that the primary mixture, the sintered return ore and the blast furnace return ore are uniformly mixed with the water to form the secondary mixture.
The water content can be obtained according to the comprehensive water content of the primary mixture, the intensified water adding amount, the steam consumption and the like, and is kept stable as much as possible, and the infrared water meter can be used for assisting in detecting data in the process. And the mixing procedure is provided with an infrared moisture meter, and the moisture of the mixture is automatically regulated through online monitoring of a PLC system, so that the production is stable.
Specifically, in step S42, the blending amounts of the primary mix, the sintered return ore, and the blast furnace return ore are respectively obtained according to the following formulas:
F(t/h)＝t(kg/m)×v(m/s)×3600(s/h)/1000(kg/t)×n
wherein: f is the batching amount of the first mixture, the batching amount of the sintered return ore or the batching amount of the blast furnace return ore, t is the material layer of the first mixture, the material layer of the sintered return ore or the material layer of the blast furnace return ore, v is the belt conveying speed, and n is the proportion of the first mixture, the proportion of the sintered return ore or the proportion of the blast furnace return ore.
The primary mixture, the sintered return ore and the blast furnace return ore are transported into a secondary batching room through a belt. The set material layer and the set proportion are substituted into the formula, so that the batching of the material can be obtained, for example, the material layer and the set proportion of the primary mixture are substituted into the formula, so that the batching of the primary mixture can be obtained.
When the burden amounts of the secondary mixture and the sintered return ores and the blast furnace return ores are calculated based on the charging amounts, the steps include:
s34: setting the feeding amount and the proportion of primary mixture, sintered return ore and blast furnace return ore; wherein, the feeding amount is the amount of all the mixture fed into the sintering machine.
S35: and respectively obtaining the batching amounts of the primary mixture, the sintered return ores and the blast furnace return ores according to the feeding amount and the proportioning.
S36: the primary mixture, the sintered return ore and the blast furnace return ore are transported into a secondary mixer according to respective proportioning, and water is added into the secondary mixer, so that the primary mixture, the sintered return ore and the blast furnace return ore are uniformly mixed with the water to form the secondary mixture.
Specifically, in step S45, the blending amounts of the primary mixture, the sintered return ore and the blast furnace return ore are respectively obtained according to the following formulas:
F(t/h)＝f(t/h)×n
wherein: f is the batching amount of the primary mixture, the batching amount of the sintered return ore or the batching amount of the blast furnace return ore, F is the feeding amount, and n is the proportioning of the primary mixture, the proportioning of the sintered return ore or the proportioning of the blast furnace return ore.
The set proportion of the materials is substituted into the formula, so that the batching of the materials can be obtained, for example, the proportion of the primary mixture is substituted into the formula, so that the batching of the primary mixture can be obtained.
Specifically, the proportion of the primary mixture can be 70%, and the total proportion of the blast furnace return ores and the sintered return ores is 30%.
Namely, the primary mixture accounts for 70%, the blast furnace return ore and the sintered return ore together account for 30%, for example, the proportion of the blast furnace return ore can be 12%, and the proportion of the sintered return ore can be 18%.
Namely, the sintering batching method provided by the embodiment of the application comprises a twice batching process, each initial material is batched for the first time to form a primary mixture, the sintering return ore and the blast furnace return ore are batched to form a secondary batch, the sintering return ore and the blast furnace return ore are both carbon-containing, when workers observe that the sintering becomes poor at the tail of the sintering machine, the proportion of the sintering return ore and the blast furnace return ore in the secondary proportion can be adjusted to adjust the carbon content of the sintering ore without adjusting the primary proportion, so that the adjustment time is shorter, and when the carbon content changes, the sintering return ore quality can be timely adjusted to be more stable. Specifically, when the carbon content of the primary mixture is low, the mixture ratio of the sintering return ores and the blast furnace return ores can be improved, so that the sintering ores are sufficiently carbon-containing, the combustion effect is good, and the quality of the sintering ores is ensured; when the carbon content of the primary mixture is high, the proportion of the sintering return ores to the blast furnace return ores can be reduced, so that the total carbon content of the sintering ores is reduced, the oversmelting phenomenon can not occur, the sintering ores can not generate molten sintering cakes, the air permeability of the sintering ores is reduced, the metallurgical properties such as reducibility and the like are influenced, and finally the quality of the sintering ores is influenced.
When the carbon content is not required to be greatly adjusted, the mixture ratio of the sintering return ore and the blast furnace return ore in the secondary mixture ratio is only required to be adjusted, but if the carbon mixture ratio is problematic, the mixture ratio of each initial material in the primary mixture ratio is required to be directly adjusted, and the adjustment of the primary mixture ratio takes a long time. In any case, only one proportioning can be adjusted, so that the adjustment time is long, and in practical application, most cases do not need to be greatly adjusted, therefore, the sintering proportioning method provided by the embodiment of the application greatly shortens the proportioning adjustment time, reduces material consumption fluctuation, and realizes smooth and steady operation of the sintering machine.
S4: the secondary mixture is mixed and granulated to produce sintered ore.
The secondary mix may be transported to a tertiary mixer for mixing and pelletization to produce sintered ore.
The sintering batching method provided by the embodiment of the application realizes 'two-blending and three-mixing', namely twice batching and three-mixing. The first batching is to batching all initial materials to form a first mixture, and the second batching is to batching the first mixture, sintered return ores and blast furnace return ores to form a second mixture, wherein both the sintered return ores and the blast furnace return ores contain carbon. The first mixing is to mix the primary mixture with a small amount of blast furnace return ore and add water to achieve the viscosity reducing effect, the second mixing is to mix the primary mixture with the blast furnace return ore and sinter return ore to form a secondary mixture after the proportioning is completed, and the third mixing is to mix and granulate the secondary mixture. The sintering proportioning method based on the two-blending and three-mixing provided by the embodiment of the application can directly change the proportion of the carbon by adjusting the proportion of the sintering return ore and the blast furnace return ore in the secondary proportioning in the sintering production process when the proportion of the carbon is required to be adjusted, and the primary proportioning is not required to be adjusted, so that the adjustment time of sintering parameters is greatly shortened, the index control precision is improved, the material consumption fluctuation is reduced, the stable control of the carbon content of the sintering ore is realized, and the quality of the sintering ore and the production stability are ensured. Aiming at the existing sintering batching operation, the method has higher stability and controllability and has important significance for improving the sintering product quality and reducing the production cost.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. A method of sintering a batch comprising:
transporting each initial material into a primary batching chamber for primary batching to form primary mixed materials;
conveying the primary mixture, the sintered return ores and the blast furnace return ores into a secondary batching room for secondary batching, and uniformly mixing to form a secondary mixture;
and mixing and granulating the secondary mixture to generate sintered ore.
2. The sinter dosing method as claimed in claim 1, wherein said transporting the primary mix, the sinter return and the blast furnace return to a secondary dosing chamber for a second dosing and mixing uniformly to form a secondary mix comprises:
setting the proportions of the primary mixture of the material layer, the sintered return ores and the blast furnace return ores;
respectively obtaining the batching amounts of the primary mixture, the sintered return ores and the blast furnace return ores according to the proportion and the material layers;
and conveying the primary mixture, the sintered return ores and the blast furnace return ores into a secondary mixer according to respective proportioning, and adding water into the secondary mixer to uniformly mix the primary mixture, the sintered return ores and the blast furnace return ores with the water to form a secondary mixture.
3. The sinter batch method according to claim 2, wherein in the step of obtaining the batch amounts of the primary mix, the sinter return and the blast furnace return, respectively, based on the ratio and the material layers, the batch amounts of the primary mix, the sinter return and the blast furnace return are calculated according to the following formula:
F(t/h)＝t(kg/m)×v(m/s)×3600(s/h)/1000(kg/t)×n
wherein: f is the batching amount of the first mixture, the batching amount of the sintering return ore or the batching amount of the blast furnace return ore, t is the material layer, v is the belt conveying speed, and n is the proportion of the first mixture, the proportion of the sintering return ore or the proportion of the blast furnace return ore.
4. The sinter dosing method as claimed in claim 1, wherein said transporting the primary mix, the sinter return and the blast furnace return to a secondary dosing chamber for a second dosing and mixing uniformly to form a secondary mix comprises:
setting the feeding amount and the respective proportions of the primary mixture, the sintered return ores and the blast furnace return ores;
respectively obtaining the batching amounts of the primary mixture, the sintered return ores and the blast furnace return ores according to the feeding amount and the proportion;
and conveying the primary mixture, the sintered return ores and the blast furnace return ores into a secondary mixer according to respective proportioning, and adding water into the secondary mixer to uniformly mix the primary mixture, the sintered return ores and the blast furnace return ores with the water to form a secondary mixture.
5. The sinter batch method according to claim 4, wherein in the step of obtaining the batch amounts of the primary mix, the sinter return and the blast furnace return according to the feed amount and the mixture ratio, the batch amounts of the primary mix, the sinter return and the blast furnace return are calculated according to the following formula:
F(t/h)＝f(t/h)×n
wherein: f is the batching amount of the primary mixture, the batching amount of the sintering return ore or the batching amount of the blast furnace return ore, F is the feeding amount, and n is the proportion of the primary mixture, the proportion of the sintering return ore or the proportion of the blast furnace return ore.
6. The sintering proportioning method of any of claims 2 or 4, wherein the proportion of the primary mixture is 70%, and the proportion of the blast furnace return ore and the sintering return ore is 30% in total.
7. The sintering batching method according to claim 1, wherein the step after transporting each initial material to a primary batching chamber for primary batching, forming a primary mix comprises:
transporting the primary mixture to a vertical mixer, and adding blast furnace return ores into the vertical mixer to uniformly mix the primary mixture and the blast furnace return ores; wherein, the batching amount of the blast furnace return ore is smaller than that of the primary mixture;
adding water into the vertical mixer to uniformly mix the primary mixture, the blast furnace return ores and the water;
the primary mix is transported to an intermediate bin.
8. The sintering batching method according to claim 7, wherein the primary mix is transported to a vertical mixer, and blast furnace return ore is added to the vertical mixer, and in the step of uniformly mixing the primary mix and the blast furnace return ore, the ratio of the primary mix to the blast furnace return ore is 9:1.
9. the sinter batching method according to claim 1, wherein the particle size of the sinter return and the blast furnace return is less than 6mm.
10. The sintering batching method according to claim 1 wherein the starting materials comprise iron ore fines, fluxes and fuel.
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