CN220317914U - Sinter production system - Google Patents

Abstract

The utility model provides a sinter production system, which belongs to the technical field of ferrous metallurgy and comprises: the device comprises a first mixer, a second mixer, a distributing hopper, a coarse grain mixing bin, a third mixer and a fine grain mixing bin; the coarse grain mixture and the fine grain mixture are respectively conveyed by connecting the output end of the second mixer with the distributing hopper; under the condition that the fuel consumption is unchanged, the original one-layer sintering upper material layer can be changed into two-layer sintering upper material layers through three times of mixing, so that the layered distribution of the mixture on the sintering machine is realized; by fueling twice, the fuel of the mixture on the sintering is gradually reduced from top to bottom, and the granularity of the mixture is gradually reduced from bottom to top; by adding water for three times, the water content of the mixture is gradually reduced from top to bottom, the water content of the mixture is reduced, the air permeability of the material layer is improved, the material layer is sintered uniformly up and down, the quality of the sintered ore is improved, and the yield of the sintered ore is increased.

Description

Sinter production system

Technical Field

The utility model belongs to the technical field of ferrous metallurgy, and particularly relates to a sinter production system.

Background

At present, most blast furnaces in iron and steel enterprises in China still use sinter as a main iron-making raw material, and the sinter is sintered by a sintering machine. The sintering is a process of mixing various iron-containing raw materials with proper amount of fuel and flux, adding proper amount of water, and making the sinter bed undergo a series of physical and chemical changes on the sintering machine after mixing, and binding mineral powder particles into blocks, so that the air permeability of the sinter bed directly affects the productivity of the sintering machine and the quality of the sinter. Although the particle size composition of the mixture and the amount of fuel added to the mixture have a direct effect on the air permeability of the sinter bed; however, the air permeability of the sinter bed is directly affected by the material distribution effect of the mixture on the sintering machine, so that the yield and the quality of the sinter are affected.

For this reason, a great deal of researches are carried out on the material distribution mode by experts in the sintering industry, such as Sun Dong of the Anshan metallurgical design institute, for example, researching some methods adopted in improving the air permeability of the sintered mineral aggregate layer at home and abroad; the improvement of the sintering effect by a multi-roll distributor was studied by Arbitrary et al of the saddle steel institute. In addition, several patent applications disclose methods for improving the quality and yield of sintered ore, such as patent number CN114485179a discloses a layered distribution device comprising a support and a plurality of distribution bars, and a sintering machine. Wherein the stand is configured to straddle above the sintering pallet. Each cloth stick all includes the cloth section, and each cloth section sets up on the support along the vertical interval of first direction to form screening clearance between each cloth section. Each cloth section extends downwards from the bracket in a tilting way along the reverse direction of the first direction, and the outer diameter is gradually reduced. So that the granularity of the mixture paved on the sintering lathe is gradually reduced from bottom to top, and stepless layering of the mixture is realized. As disclosed in patent number CN115261615a, a sintering batching method for grading and layering distribution of return ores is disclosed, the return ores are graded, small-particle-size return ores and other materials are granulated in a mixer to form mixed material particles with uniform particle sizes, and then the mixed material particles and large-particle-size return ores are layered and distributed on a sintering trolley, so that the air permeability of a sintering batching layer is effectively improved, and industrial production is realized. As disclosed in patent No. CN201397047Y, the utility model can obviously raise the upper temperature of the material layer, properly lower the temperature of the material layer, thereby avoiding the phenomena of insufficient heat supply of the surface layer of the sinter and overburning of the sinter at the lower part to a certain extent, fully utilizing the heat storage function of the sinter layer, reducing the consumption of solid fuel, lowering the sintering energy consumption and improving the quality of the sinter. As disclosed in patent number CN108398025B, a roller screening machine is installed below a shuttle type distributor, a large-size-fraction mixed material distribution chute is arranged below the front of the roller screening machine, a small-size-fraction mixed material distribution chute is arranged below the roller screening machine, and a round roller distributor and a multi-roller distributor are respectively arranged below the large-size-fraction mixed material distribution chute and the small-size-fraction mixed material distribution chute in sequence. The utility model can improve the fuel heat efficiency, homogenize the quality of the sinter, reduce the consumption of the sinter solid fuel, realize the reduction of the negative pressure of the thick material layer and improve the sintering efficiency; the damage of the heat accumulation effect of the material layer to the grate is reduced, and the sintering productivity and quality are improved.

Although the air permeability of the sintered cloth is improved to a certain extent, the improvement on the quality of the sintering ore and the productivity of a sintering machine is limited, and the problems of low quality of the sintering ore, low sintering yield and the like still exist in the patent applications.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art or related art.

To this end, the utility model proposes a sinter production system comprising: the device comprises a first mixer, a second mixer, a distributing hopper, a coarse grain mixing bin, a third mixer and a fine grain mixing bin; the first mixer is used for mixing ingredients for one time; the second mixer is connected with the output end of the first mixer and is used for secondarily mixing the mixture; the distributing hopper is connected with the output end of the second mixer, and the bottom of the distributing hopper is provided with a coarse grain outlet and a fine grain outlet for distributing and outputting the secondarily mixed mixture; the coarse grain mixing bin is connected with the coarse grain discharge port; the third mixer is connected with the fine particle discharge port and is used for mixing the mixture for three times; the fine particle mixing bin is connected with the output end of the third mixer.

In addition, the sinter production system in the technical scheme provided by the utility model can also have the following additional technical characteristics:

optionally, a distributing plate is arranged in the distributing hopper, the distributing plate is positioned between the coarse grain discharging port and the fine grain discharging port, and the distributing plate separates the space in the distributing hopper to form a coarse grain discharging channel and a fine grain discharging channel.

Optionally, the sinter production system further comprises: a feed conveyor; the feeding conveying device is arranged below the coarse grain mixing bin and the fine grain mixing bin and is used for conveying ingredients into the sintering machine; wherein, coarse grain mixing silo is located the one end that feeding conveyor kept away from the sintering machine, and fine grain mixing silo is located the one side that coarse grain mixing silo is close to the sintering machine.

In another aspect of the present application, there is provided a sinter production process, the sinter production process comprising:

mixing for the first time, adding ingredients, water and fuel into a first mixer for mixing for the first time, and conveying the mixed materials after the first time to a second mixer;

secondary mixing, namely adding water into a second mixer, carrying out secondary mixing, enabling mixed materials after secondary mixing to be discharged in a split manner from a distributing hopper, conveying coarse-grain mixed materials into a coarse-grain mixing bin, and conveying fine-grain mixed materials into a third mixer;

adding fuel and water into a third mixer for three times of mixing, and conveying the mixed material after three times of mixing to a fine particle mixing bin;

distributing, namely paving a ground layer on the feeding conveying device, and sequentially paving coarse-grain mixture discharged from the coarse-grain mixing bin and fine-grain mixture discharged from the fine-grain mixing bin above the ground layer;

sintering, wherein the feeding and conveying device sends the mixture into a sintering machine, and the mixture is sintered in the sintering machine to obtain the sintered ore.

Optionally, before one mixing, water is added to make quicklime in the ingredients react completely, and then the rest ingredients and water are added.

Optionally, the fuel adding amount of one-time mixing is 80% -90% of the total fuel amount, the water adding amount of one-time mixing is 80% -85% of the total water adding amount of the mixture, and the time of one-time mixing is 2-3 min.

Optionally, during secondary mixing, water is added from the inlet of the second mixer to the position of 2/3 of the length of the second mixer in a water spraying mode, and the water adding amount of secondary mixing is 10% -15% of the total water adding amount of the mixture; and stopping adding water in the later 1/3 section of the second mixer, wherein the secondary mixing time is 3-5 min.

Optionally, when mixing for three times, adding fuel into the third mixer before the fine-grained mixture enters the third mixer, wherein the amount of the fuel added by the three times of mixing is 10% -20% of the total fuel.

Optionally, water is added in a water spraying mode in three times of mixing, and the water adding amount is 5% -10% of the total water adding amount of the mixture. The time of the three mixing is 3-5 minutes.

Optionally, during material distribution, the coarse material mixing bin and the fine material mixing bin are sequentially arranged at one end, far away from the sintering machine, of the feeding conveying device along the length direction of the feeding conveying device, so that the upper material layer entering the sintering machine is a ground material layer, a coarse material mixing layer and a fine material mixing layer from bottom to top.

Compared with the prior art, the sinter production system has the beneficial effects that:

the output end of the second mixer is connected with the distributing hopper, and coarse-grain mixture and fine-grain mixture are respectively conveyed by utilizing the characteristic of natural segregation of the mixture by the mixer; combining the process steps of three times of mixing, three times of water adding and two times of fuel adding, and under the condition that the fuel consumption is unchanged, changing the original one-layer sintering upper material layer into two-layer sintering upper material layers by three times of mixing, so that layered material distribution of the mixture on the sintering machine is realized; by fueling twice, the fuel of the mixture on the sintering is gradually reduced from top to bottom, and the granularity of the mixture is gradually reduced from bottom to top; by adding water for three times, the water content of the mixture is gradually reduced from top to bottom, the water content of the mixture is reduced, the air permeability of the material layer is improved, the upper material layer and the lower material layer can be sintered uniformly, the FeO content of the sinter is reduced, the quality of the sinter is improved, and the yield of the sinter is increased.

Under the condition of unchanged fuel consumption, the water content of the mixture is reduced by 0.6 percent, the FeO content is reduced by about 0.5 percent, the sintering of the sintering material layer is uniform, the yield of the sintering ore is improved by 5-9 percent, and the production quality of the sintering ore is improved; the drum index is improved by at least 5%, the drum strength is increased, the mechanical strength of the sintered mineral product is higher, the service life is longer, and the quality is better; the utilization coefficient of the sintering machine is improved by about 0.6 t/(h.m2), the productivity of the sintering process is improved, and the production efficiency is improved.

The production system can be improved on the basis of the existing sinter production equipment, the operation difficulty is low, the sinter production quality can be improved through simple transformation, and the production cost is reduced.

Drawings

FIG. 1 is a schematic diagram of a sinter production system according to an embodiment of the utility model;

FIG. 2 is a schematic view showing a structure of a distribution hopper of a sinter production system according to an embodiment of the utility model;

FIG. 3 is a flow chart of a sinter production process according to an embodiment of the utility model;

wherein, the correspondence between the reference numerals and the component names in fig. 1 to 3 is:

12. a first mixer; 14. a second mixer; 16. a distributing hopper; 18. coarse grain mixing bin; 20. a third mixer; 22. a fine particle mixing bin; 24. a material dividing plate; 26. a feed conveyor; 28. a first conveyor; 30. a second conveyor; 32. a third conveyor; 34. a fourth conveyor; 36. a fifth conveyor; 38. a first feed port; 40. a second feed inlet; 42. and a third feed inlet.

Detailed Description

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.

Referring now to fig. 1-2 in combination, in accordance with an embodiment of the present application, a sinter production system comprises: a first mixer 12, a second mixer 14, a distribution hopper 16, a coarse-grain mixing bin 18, a third mixer 20, and a fine-grain mixing bin 22; the first mixer 12 is used for mixing ingredients once; the second mixer 14 is connected with the output end of the first mixer 12, and the second mixer 14 is used for secondarily mixing the mixture; the distributing hopper 16 is connected with the output end of the second mixer 14, and the bottom of the distributing hopper 16 is provided with a coarse grain discharge port and a fine grain discharge port for distributing and outputting the secondarily mixed mixture; the coarse grain mixing bin 18 is connected with a coarse grain discharge port; the third mixer 20 is connected with the fine grain discharge port, and the third mixer 20 is used for mixing the mixture for three times; the fine-grain mixing silo 22 is connected to the output of the third mixer 20. By connecting the output end of the second mixer 14 with the distributing hopper 16, the mixture with larger mass and larger particles is discharged from the coarse grain discharge outlet far away from the second mixer 14 and enters the coarse grain mixing bin 18 by utilizing the characteristic of natural segregation of the mixture by the mixer; and the smaller mass, smaller particle mix is discharged from the fines discharge outlet near the second mixer 14 into the third mixer 20, after a third mixing into the fines mixing silo 22. Because coarse grain mixture and fine grain mixture are respectively conveyed, an original one-layer sintering upper material layer can be changed into two-layer sintering upper material layers, layered distribution of the mixture on a sintering machine is realized, granularity of the two-layer upper material layers is obviously changed, air permeability of the material layers is improved, uniform sintering of the sintering upper material layers up and down can be realized, feO content of sinter is reduced, quality of the sinter is improved, and yield of the sinter is increased.

Further, the coarse grain mixing bin 18 and the fine grain mixing bin 22 are provided with discharge ports, and coarse grain mixture and fine grain mixture are spread into a material layer and then sent into a sintering machine to be ignited and sintered to form sintered ore.

Further, due to the rotation of the second mixer 14, the mixture is in spiral motion in the interior, and the water adding amount in the second mixer 14 and the rotation speed of the second mixer 14 are adjusted, so that the particle size classification of the mixture after the output of the second mixer 14 is more obvious.

It should be noted that, this production system can improve on the basis of current sinter production facility, and the operation degree of difficulty is low, can improve sinter production quality through simple transformation, reduction in production cost.

A distributing plate 24 is arranged in the distributing hopper 16, the distributing plate 24 is arranged between the coarse grain discharging port and the fine grain discharging port, and the distributing plate 24 separates the space in the distributing hopper 16 to form a coarse grain discharging channel and a fine grain discharging channel. By arranging the distributing plate 24 in the distributing hopper 16 to separate the coarse grain discharging port from the fine grain discharging port, natural segregation is generated after the mixture is discharged from the second mixer 14, and the mixture is divided into coarse grain mixture and fine grain mixture which are respectively used as a coarse mixture layer and a fine mixture layer, so that layered distribution of the mixture on the sintering machine is realized, the air permeability of the material layer is improved, the upper and lower uniform sintering of the sintering material layer is realized, and the production quality of sintered ores is improved.

A distributor plate 24 is adjustably disposed within the distributor hopper 16. So that the angle of the distribution plate 24 can be adjusted to change the opening sizes of the coarse grain discharge port and the fine grain discharge port, and control the discharge ratio of the coarse grain mixture and the fine grain mixture.

Further, when the distributing plate 24 is covered over the coarse particle discharge port or the fine particle discharge port, the distributing hopper 16 cannot distribute the mixture, and the mixture can be discharged through only one of the two discharge ports.

The section of the distributing plate 24 is U-shaped. So as to fix the distributing plate 24 in the distributing hopper 16, avoid the gap between the distributing plate 24 and the inner wall of the distributing hopper 16, and ensure the distributing quality.

The distributing plate 24 includes a partition portion and a connecting portion, and the two partition portions are vertically disposed on the connecting portion, and the two connecting portions are respectively connected with two opposite side walls of the distributing hopper 16. The connecting portion is attached to and connected with the side wall of the distributing hopper 16 so that the isolating portion is arranged in the distributing hopper 16, the distributing plate 24 is prevented from being displaced under the impact of the mixture, and the connection stability is improved.

The connecting portion is fixed to the inner wall of the dispensing hopper 16 by bolts and nuts. The bolts and nuts are convenient to disassemble, and the angle of the distributing plate 24 is convenient to quickly adjust, so that the discharge proportion of coarse-grain mixture and fine-grain mixture is quickly changed according to requirements.

A feed conveyor 26 is arranged below the coarse-grain mixing bin 18 and the fine-grain mixing bin, the feed conveyor 26 being used for conveying the ingredients into the sintering machine; wherein the coarse mixing bin 18 is located at an end of the feed conveyor 26 remote from the sintering machine and the fine mixing bin 22 is located at a side of the coarse mixing bin 18 near the sintering machine. The coarse mix from coarse mix bin 18 and the fine mix from fine mix bin 22 fall directly onto feed conveyor 26 to form a bed of material, are layered on feed conveyor 26, and are then transferred to the sintering machine. Because the feeding and conveying device 26 conveys the mixture to the direction of the sintering machine, in the running process of the feeding and conveying device 26, the fine-grain mixture can fall above the coarse-grain mixture to form a coarse mixture layer and a fine mixture layer, and compared with the mixture with a single layer, the air permeability of the upper material layer after layering and distributing is better, the upper material layer and the lower material layer can be sintered uniformly, and the yield of the sintered ore is increased.

The first mixer 12 is provided with a first feed opening 38, and the feed end of the first mixer 12 is provided with a first conveyor 28, the first conveyor 28 being arranged to convey ingredients into the first feed opening 38. By providing the first conveyor 28 in front of the first mixer 12, the ingredients can be directly mixed on the first conveyor 28 during transportation, and then uniformly fed into the first mixer 12 through the first feed opening 38 for primary mixing.

The second mixer 14 is provided with a second feed inlet 40, the feed end of the second mixer 14 is provided with a second conveyor 30, one end of the second conveyor 30 is located below the first mixer 12, and the second conveyor 30 is used for conveying the mixture into the second feed inlet 40. The second conveyer 30 is obliquely arranged, one end of the second conveyer 30 is arranged below the first mixer 12, the primary mixed material is directly received, and then the primary mixed material is conveyed into the second mixer 14 through the second feeding port 40, so that the transfer process is short and the efficiency is high.

A third conveyor 32 is arranged below the coarse discharge opening, the third conveyor 32 being used for conveying the secondary mix into the coarse mix bin 18. The transport of the secondarily mixed coarse mix by the third conveyor 32 takes place directly in the coarse mix bin 18, ensuring that the coarse mix bin 18 can be arranged at the end of the feed conveyor 26 remote from the sintering machine, ensuring that the coarse mix layer is laid down under the fine mix layer with the feed conveyor 26, forming a two-layer sintered charge layer.

The third mixer 20 is provided with a third feed port 42, and a fourth conveyor 34 is provided below the fine particle discharge port, and the fourth conveyor 34 is used for conveying the secondary mix into the third mixer 20. The fine-grain mixture is held by the fourth conveyor 34, and the fine-grain mixture and the coarse-grain mixture are transported separately to a specified position.

A fifth conveyor 36 is provided below the third mixer 20, the fifth conveyor 36 being used to transport the tertiary mix into the fine-grain mixing silo 22. The secondary mixed fine particulate mixture is transported by the fifth conveyor 36 to directly receive the fine particulate mixture instead of the fine particulate mixing silo 22, ensuring that the fine particulate mixing silo 22 may be disposed on the side of the coarse particulate mixing silo 18 adjacent the sintering machine to ensure delivery with the feed conveyor 26, with the fine particulate mixture layer being laid down below the fine particulate mixture layer to form a two-layer sintered charge layer.

Further, by varying the transport speed of the feed conveyor, the thickness of the coarse-grain mixture and the fine-grain mixture on the feed conveyor can be adjusted simultaneously. The thickness of the coarse-grained mixture can be individually adjusted by adjusting the transportation speed of the third conveyor 32; the thickness of the fine-grained mixture can be individually adjusted by adjusting the fourth conveyor 34 and the fifth conveyor 36.

Referring to fig. 3 in combination, according to a second aspect of the present utility model, there is provided a sinter production process comprising: primary mixing, wherein ingredients, water and fuel are added into the first mixer 12 for primary mixing, and the primary mixed mixture is conveyed into the second mixer 14; secondary mixing, namely adding water into the second mixer 14 to carry out secondary mixing, so that the mixture after secondary mixing is discharged in a split way from the distributing hopper 16, coarse-grain mixture is conveyed into the coarse-grain mixing bin 18, and fine-grain mixture is conveyed into the third mixer 20; adding fuel and water into the third mixer 20 for three times of mixing, and conveying the mixed materials after three times of mixing to the fine particle mixing bin 22; distributing materials, namely paving a pavement layer on the feeding conveying device 26, and sequentially paving coarse-grain mixture discharged from the coarse-grain mixing bin 18 and fine-grain mixture discharged from the fine-grain mixing bin 22 above the pavement layer; the sintering, the feed conveyor 26 feeds the mixture into a sintering machine, where the mixture is sintered to obtain sintered ore. The output end of the second mixer 14 is connected with the distributing hopper 16, and coarse-grain mixture and fine-grain mixture are respectively conveyed by utilizing the characteristic of natural segregation of the mixture by the mixer; combining the process steps of three times of mixing, three times of water adding and two times of fuel adding, and under the condition that the fuel consumption is unchanged, changing the original one-layer sintering upper material layer into two-layer sintering upper material layers by three times of mixing, so that layered material distribution of the mixture on the sintering machine is realized; by fueling twice, the fuel of the mixture on the sintering is gradually reduced from top to bottom, and the granularity of the mixture is gradually reduced from bottom to top; by adding water for three times, the water content of the mixture is gradually reduced from top to bottom, the water content of the mixture is reduced, the air permeability of a material layer is improved, the quality of the sinter is improved, the yield of the sinter is increased, and the burn-up cost is reduced.

Before primary mixing, water is added to make quicklime in the ingredients react completely, and then the rest ingredients and water are added. Firstly, water is added to enable quicklime to react completely, water used for slaking quicklime is not in the total water adding amount of the mixture, and firstly slaking quicklime can reduce the water consumption of the mixture, so that the total water adding amount of the mixture is reduced, and the water adding amount in each mixing process can be ensured to be accurate.

The addition amount of the fuel mixed once is 80-90% of the total fuel amount, the addition amount of the fuel mixed once is 80-85% of the total addition amount of the mixture, and the time of the fuel mixed once is 2-3 min. The water is added to the mixture for the first time, the water is added to the rest mixture for the second time and the third time, so that the fine mixture layer is ensured to have enough water, the water of the upper material layer after the material is distributed is gradually reduced from top to bottom, the air permeability of the material layer is improved, and the quality of the sintered ore is improved.

During secondary mixing, water is added from the inlet of the second mixer 14 to the position of 2/3 of the length of the second mixer 14 in a water spraying mode, and the water adding amount of secondary mixing is 10% -15% of the total water adding amount of the mixture; in the latter 1/3 stage of the second mixer 14, no water is added, and the secondary mixing time is 3-5 min. In the secondary mixing, water is added in the first 2/3 section of the second mixer 14 in a water spraying mode, and water is not added in the second 1/3 section, so that coarse-grain mixture is uniformly mixed with water before being discharged from the second mixer 14, the water content of the coarse-grain mixture discharged first is ensured to be minimum, the water content of a material loading layer after material distribution is gradually reduced from top to bottom, and the air permeability of the material loading layer is improved.

When mixing for three times, before the fine particle mixture enters the third mixer 20, fuel is added into the third mixer 20, and the amount of the fuel added for the three times is 10-20% of the total fuel. Water is added in a water spraying mode in three times of mixing, and the water adding amount is 5-10% of the total water adding amount of the mixture. The time of the three mixing is 3-5 minutes. The remaining water was added during the three mixes to make the water content of the fine-grain mixture higher than that of the coarse-grain mixture discharged.

When the material is distributed, the coarse material mixing bin and the fine material mixing bin are sequentially arranged at one end, far away from the sintering machine, of the feeding conveying device 26 along the length direction of the feeding conveying device 26, so that the upper material layer entering the sintering machine is a ground material layer, a coarse material mixing layer and a fine material mixing layer from bottom to top. By paving the ground layer, the grate is protected, the binder of the grate is reduced, the dust removal load is reduced, and the service life of the fan rotor is prolonged.

Example 1:

the main chemical properties of the raw materials are shown in the following table:

table 1: multi-element analysis result of sintering material

Table 2: iron ore powder particle size composition detection result

Table 3: iron ore concentrate granularity composition detection result

(1) Primary mixing

Mixing mineral powder, iron ore concentrate, sintered return ores and quicklime according to a certain proportion, wherein the mineral powder comprises the following components: concentrate = 40:60, quicklime 6%, return ore 20%, coke powder 5.0% and mixed material water 8.0%. The amount of the burnt mixture before primary mixing is 100% of the total fuel amount, and the quicklime is completely reacted by adding water before primary mixing. The prepared mixture is conveyed to a first mixer which runs through a first conveyor, water is added to the mixture in the process of primary mixing of the first mixer, the primary mixing water adding amount is 85% of the total water adding amount of the mixture, and the primary mixing time is 3min.

(2) Secondary mixing

The mixture mixed by the first mixer is discharged and then conveyed to a second mixer through a second conveyor, and the water adding amount of secondary mixing is 15% of the total water adding amount of the mixture. The secondary mixing time was 5min. The mixed materials mixed by the second mixer fall into a distributing hopper, and the inclination angle of a distributing plate is adjusted to ensure that the mixed materials are all discharged onto a third conveyor. All the mixture is directly conveyed to a coarse grain mixing bin at one end of the feeding conveying device through a third conveyor.

(3) Cloth material

Paving a ground layer on the feeding conveying device, and paving coarse-grain mixture discharged from the coarse-grain mixing bin above the ground layer, so that an upper material layer entering the sintering machine is a ground layer and a coarse-grain mixture layer from bottom to top.

(4) Sintering

The feeding and conveying device sends the mixture into a sintering machine, and the mixture is sintered in the sintering machine to obtain the sintered ore.

Table 4: sintering result

Example 2:

the properties of the raw materials are shown in tables 1, 2 and 3.

(1) Primary mixing

Mixing mineral powder, iron ore concentrate, sintered return ores and quicklime according to a certain proportion, wherein the mineral powder comprises the following components: concentrate = 40:60, quicklime 6%, return ore 20%, coke powder 5.0% and mixed material water 7.4%. The amount of the burnt mixture before primary mixing is 80% of the total fuel amount, and the quicklime is completely reacted by adding water before primary mixing. The prepared mixture is conveyed to a first mixer which runs through a first conveyor, water is added to the mixture in the process of primary mixing of the first mixer, the primary mixing water adding amount is 80% of the total water adding amount of the mixture, and the primary mixing time is 3min.

(2) Secondary mixing

The mixture mixed by the first mixer is discharged and then conveyed into a second mixer through a second conveyor, water is added from the inlet of the second mixer to the position 2/3 of the inlet of the mixer in a water spraying mode, water addition is stopped at 1/3 section after the second mixer, and the water addition amount of secondary mixing is 15% of the total water addition amount of the mixture. The secondary mixing time was 5min. The mixed materials mixed by the second mixer fall into the distributing hopper, and the distributing plate discharges the mixed materials falling on two sides of the distributing plate onto the third conveyor and the fourth conveyor respectively. The coarser mixture is conveyed directly into the coarse-grain mixing bin at one end of the feed conveyor by a third conveyor, and the finer mixture is conveyed into the third mixer by a fourth conveyor.

(3) Three times of mixing

The mixture which is relatively fine after secondary mixing is conveyed to a third mixer through a fourth conveyor, and fuel is added before the mixture enters the third mixer, wherein the added fuel amount is 20% of the total fuel. After the mixture enters the third mixer, water is added in a water spraying mode, and the water adding amount is 5% of the total water adding amount of the mixture. The time for three mixes was 5 minutes. The mixture mixed three times by the third mixer is conveyed to a fine particle mixing bin at one end of the feeding conveying device by a fifth conveyor.

(4) Cloth material

The coarse material mixing bin and the fine material mixing bin are sequentially arranged at one end, far away from the sintering machine, of the feeding conveying device along the length direction of the feeding conveying device, coarse material mixture discharged by secondary mixing falls into coarse material mixture, and fine material mixture discharged by tertiary mixing falls into fine material mixture. Firstly paving a pavement layer on a feeding conveying device, and then sequentially paving coarse-grain mixture discharged from a coarse-grain mixing bin and fine-grain mixture discharged from a fine-grain mixing bin above the pavement layer; the upper material layer entering the sintering machine is sequentially a ground material layer, a coarse mixture layer and a fine mixture layer from bottom to top.

(5) Sintering

The feeding and conveying device sends the mixture into a sintering machine, and the mixture is sintered in the sintering machine to obtain the sintered ore.

Table 5: sintering result

Example 3:

the properties of the raw materials are shown in tables 1, 2 and 3.

(1) Primary mixing

Mixing mineral powder, iron ore concentrate, sintered return ores and quicklime according to a certain proportion, wherein the mineral powder comprises the following components: concentrate = 40:60, quicklime 6%, return ore 20%, coke powder 5.0% and mixed material water 7.4%. The amount of the burnt mixture before primary mixing is 85% of the total amount of fuel, and the quicklime is completely reacted by adding water before primary mixing. The prepared mixture is conveyed to a first mixer which runs through a first conveyor, water is added to the mixture in the process of primary mixing of the first mixer, the primary mixing water adding amount is 80% of the total water adding amount of the mixture, and the primary mixing time is 3min.

(2) Secondary mixing

The mixture mixed by the first mixer is discharged and then conveyed into a second mixer through a second conveyor, water is added from the inlet of the second mixer to the position 2/3 of the inlet of the mixer in a water spraying mode, water addition is stopped at 1/3 section after the second mixer, and the water addition amount of secondary mixing is 15% of the total water addition amount of the mixture. The secondary mixing time was 5min. The mixed materials mixed by the second mixer fall into the distributing hopper, and the distributing plate discharges the mixed materials falling on two sides of the distributing plate onto the third conveyor and the fourth conveyor respectively. The coarser mixture is conveyed directly into the coarse-grain mixing bin at one end of the feed conveyor by a third conveyor, and the finer mixture is conveyed into the third mixer by a fourth conveyor.

(3) Three times of mixing

The mixture which is relatively fine after secondary mixing is conveyed to a third mixer through a fourth conveyor, and fuel is added before the mixture enters the third mixer, wherein the added fuel amount is 15% of the total fuel. After the mixture enters the third mixer, water is added in a water spraying mode, and the water adding amount is 5% of the total water adding amount of the mixture. The time for three mixes was 5 minutes. The mixture mixed three times by the third mixer is conveyed to a fine particle mixing bin at one end of the feeding conveying device by a fifth conveyor.

(4) Cloth material

The coarse material mixing bin and the fine material mixing bin are sequentially arranged at one end, far away from the sintering machine, of the feeding conveying device along the length direction of the feeding conveying device, coarse material mixture discharged by secondary mixing falls into coarse material mixture, and fine material mixture discharged by tertiary mixing falls into fine material mixture. Firstly paving a pavement layer on a feeding conveying device, and then sequentially paving coarse-grain mixture discharged from a coarse-grain mixing bin and fine-grain mixture discharged from a fine-grain mixing bin above the pavement layer; the upper material layer entering the sintering machine is sequentially a ground material layer, a coarse mixture layer and a fine mixture layer from bottom to top.

(5) Sintering

The feeding and conveying device sends the mixture into a sintering machine, and the mixture is sintered in the sintering machine to obtain the sintered ore.

Table 6: sintering result

Example 4:

the properties of the raw materials are shown in tables 1, 2 and 3.

(1) Primary mixing

Mixing mineral powder, iron ore concentrate, sintered return ores and quicklime according to a certain proportion, wherein the mineral powder comprises the following components: concentrate = 40:60, quicklime 6%, return ore 20%, coke powder 5.0% and mixed material water 7.4%. The amount of the burnt mixture before primary mixing is 90% of the total fuel amount, and the quicklime is completely reacted by adding water before primary mixing. The prepared mixture is conveyed to a first mixer which runs through a first conveyor, water is added to the mixture in the process of primary mixing of the first mixer, the primary mixing water adding amount is 85% of the total water adding amount of the mixture, and the primary mixing time is 3min.

(2) Secondary mixing

The mixture mixed by the first mixer is discharged and then conveyed into a second mixer through a second conveyor, water is added from the inlet of the second mixer to the position 2/3 of the inlet of the mixer in a water spraying mode, water addition is stopped at 1/3 section after the second mixer, and the water addition amount of secondary mixing is 10% of the total water addition amount of the mixture. The secondary mixing time was 5min. The mixed materials mixed by the second mixer fall into the distributing hopper, and the distributing plate discharges the mixed materials falling on two sides of the distributing plate onto the third conveyor and the fourth conveyor respectively. The coarser mixture is conveyed directly into the coarse-grain mixing bin at one end of the feed conveyor by a third conveyor, and the finer mixture is conveyed into the third mixer by a fourth conveyor.

(3) Three times of mixing

The mixture which is relatively fine after secondary mixing is conveyed to a third mixer through a fourth conveyor, and fuel is added before the mixture enters the third mixer, wherein the added fuel amount is 10% of the total fuel. After the mixture enters the third mixer, water is added in a water spraying mode, and the water adding amount is 5% of the total water adding amount of the mixture. The time for three mixes was 5 minutes. The mixture mixed three times by the third mixer is conveyed to a fine particle mixing bin at one end of the feeding conveying device by a fifth conveyor.

(4) Cloth material

The coarse material mixing bin and the fine material mixing bin are sequentially arranged at one end, far away from the sintering machine, of the feeding conveying device along the length direction of the feeding conveying device, coarse material mixture discharged by secondary mixing falls into coarse material mixture, and fine material mixture discharged by tertiary mixing falls into fine material mixture. Firstly paving a pavement layer on a feeding conveying device, and then sequentially paving coarse-grain mixture discharged from a coarse-grain mixing bin and fine-grain mixture discharged from a fine-grain mixing bin above the pavement layer; the upper material layer entering the sintering machine is sequentially a ground material layer, a coarse mixture layer and a fine mixture layer from bottom to top.

(5) Sintering

The feeding and conveying device sends the mixture into a sintering machine, and the mixture is sintered in the sintering machine to obtain the sintered ore.

Table 7: sintering result

Example 5:

the properties of the raw materials are shown in tables 1, 2 and 3.

(1) Primary mixing

Mixing mineral powder, iron ore concentrate, sintered return ores and quicklime according to a certain proportion, wherein the mineral powder comprises the following components: concentrate = 40:60, quicklime 6%, return ore 20%, coke powder 4.4% and mixed material water 7.4%. The amount of the burnt mixture before primary mixing is 80% of the total fuel amount, and the quicklime is completely reacted by adding water before primary mixing. The prepared mixture is conveyed to a first mixer which runs through a first conveyor, water is added to the mixture in the process of primary mixing of the first mixer, the primary mixing water adding amount is 80% of the total water adding amount of the mixture, and the primary mixing time is 3min.

(2) Secondary mixing

The mixture mixed by the first mixer is discharged and then conveyed into a second mixer through a second conveyor, water is added from the inlet of the second mixer to the position 2/3 of the inlet of the mixer in a water spraying mode, water addition is stopped at 1/3 section after the second mixer, and the water addition amount of secondary mixing is 15% of the total water addition amount of the mixture. The secondary mixing time was 5min. The mixed materials mixed by the second mixer fall into the distributing hopper, and the distributing plate discharges the mixed materials falling on two sides of the distributing plate onto the third conveyor and the fourth conveyor respectively. The coarser mixture is conveyed directly into the coarse-grain mixing bin at one end of the feed conveyor by a third conveyor, and the finer mixture is conveyed into the third mixer by a fourth conveyor.

(3) Three times of mixing

The mixture which is relatively fine after secondary mixing is conveyed to a third mixer through a fourth conveyor, and fuel is added before the mixture enters the third mixer, wherein the added fuel amount is 20% of the total fuel. After the mixture enters the third mixer, water is added in a water spraying mode, and the water adding amount is 5% of the total water adding amount of the mixture. The time for three mixes was 5 minutes. The mixture mixed three times by the third mixer is conveyed to a fine particle mixing bin at one end of the feeding conveying device by a fifth conveyor.

(4) Cloth material

The coarse material mixing bin and the fine material mixing bin are sequentially arranged at one end, far away from the sintering machine, of the feeding conveying device along the length direction of the feeding conveying device, coarse material mixture discharged by secondary mixing falls into coarse material mixture, and fine material mixture discharged by tertiary mixing falls into fine material mixture. Firstly paving a pavement layer on a feeding conveying device, and then sequentially paving coarse-grain mixture discharged from a coarse-grain mixing bin and fine-grain mixture discharged from a fine-grain mixing bin above the pavement layer; the upper material layer entering the sintering machine is sequentially a ground material layer, a coarse mixture layer and a fine mixture layer from bottom to top.

(5) Sintering

The feeding and conveying device sends the mixture into a sintering machine, and the mixture is sintered in the sintering machine to obtain the sintered ore.

Table 8: sintering result

According to the sintering results of the five embodiments, under the condition that the fuel consumption is unchanged, the water consumption of the mixture subjected to the three-time water adding process is reduced by 0.6 percent compared with that of the mixture subjected to the existing secondary water adding process, the FeO content is reduced by 0.3-1.7%, the sintering of the sintering material layer is uniform, the yield of the sintering ore is improved by 5-9%, and the production quality of the sintering ore is improved; the drum index is improved by 5 to 9.1 percent, the drum strength is increased, the mechanical strength of the sintered mineral product is higher, the service life is longer, and the quality is better; the utilization coefficient of the sintering machine is improved by 0.4-0.7 t/(h.m2), the productivity of the sintering process is improved, and the production efficiency is improved.

It will be readily appreciated by those skilled in the art that the above advantageous ways can be freely combined and superimposed without conflict.

The foregoing description of the preferred embodiment of the present utility model is not intended to limit the utility model to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model. The foregoing is merely a preferred embodiment of the present application and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principles of the present application, and these modifications and variations should also be regarded as the scope of the present application.

Claims (10)

1. A sinter production system, the sinter production system comprising:

a first mixer (12), the first mixer (12) for mixing ingredients at a time;

the second mixer (14), the said second mixer (14) is connected with output end of the first mixer (12), the said second mixer (14) is used for the secondary mixing mixture;

the distributing hopper (16) is connected with the output end of the second mixer (14), and a coarse grain outlet and a fine grain outlet are arranged at the bottom of the distributing hopper (16) and are used for distributing and outputting the mixed materials which are secondarily mixed;

a coarse grain mixing bin (18), the coarse grain mixing bin (18) being connected to the coarse grain discharge port;

a third mixer (20), the third mixer (20) being connected to the fine-grain discharge port, the third mixer (20) being used for tertiary mixing of the mixture;

and the fine particle mixing bin (22), and the fine particle mixing bin (22) is connected with the output end of the third mixer (20).

2. A sinter production system as claimed in claim 1, wherein,

a distributing plate (24) is arranged in the distributing hopper (16), the distributing plate (24) is positioned between the coarse grain discharging port and the fine grain discharging port, and the distributing plate (24) separates the space in the distributing hopper (16) to form a coarse grain discharging channel and a fine grain discharging channel.

3. A sinter production system as claimed in claim 2, wherein:

a distribution plate (24) is adjustably disposed within the distribution hopper (16).

4. A sinter production system as claimed in claim 3, wherein:

the distributing plate (24) comprises a separating part and a connecting part, wherein the two separating parts are vertically arranged on the connecting part, and the two connecting parts are respectively connected with two opposite side walls of the distributing hopper (16).

5. A sinter production system as claimed in claim 4, wherein:

the connecting part is fixed on the inner wall of the distributing hopper (16) through bolts and nuts.

6. The sinter production system as claimed in claim 1, further comprising:

a feed conveyor (26), the feed conveyor (26) being arranged below the coarse-grain mixing bin (18) and the fine-grain mixing bin, the feed conveyor (26) being used for conveying ingredients into a sintering machine;

wherein the coarse grain mixing bin (18) is located at one end of the feed conveying device (26) away from the sintering machine, and the fine grain mixing bin (22) is located at one side of the coarse grain mixing bin (18) close to the sintering machine.

7. A sinter production system as claimed in claim 1, wherein:

the first mixer (12) is provided with a first feed inlet (38), the feed end of the first mixer (12) is provided with a first conveyor (28), and the first conveyor (28) is used for conveying ingredients into the first feed inlet (38).

8. A sinter production system as claimed in claim 7, wherein:

the second mixer (14) is provided with a second feed inlet (40), the feed end of the second mixer (14) is provided with a second conveyor (30), one end of the second conveyor (30) is located below the first mixer (12), and the second conveyor (30) is used for conveying the mixture into the second feed inlet (40).

9. A sinter production system as claimed in claim 8, wherein:

a third conveyor (32) is arranged below the coarse grain discharge opening, and the third conveyor (32) is used for conveying the secondary mixed mixture into the coarse grain mixing bin (18).

10. A sinter production system as claimed in claim 9, wherein:

a third feeding port (42) is arranged on the third mixer (20), a fourth conveyor (34) is arranged below the fine grain discharging port, and the fourth conveyor (34) is used for conveying the secondary mixed mixture into the third mixer (20); a fifth conveyor (36) is arranged below the third mixer (20), and the fifth conveyor (36) is used for conveying the tertiary mixture into the fine-particle mixing bin (22).