CN211620349U - A steel mill sludge treatment system - Google Patents

Abstract

The utility model discloses a steel mill sludge treatment system, which belongs to the technical field of sludge treatment. It includes a storage bin, a dryer, a separator and a silo. The dryer is respectively connected with the storage bin and the separator. The bottom of the dryer is provided with an air inlet pipe, one end is provided with an air extraction pipe, and the other end of the air extraction pipe is provided with a valve , and is connected with the separator, and the lower end of the separator is provided with a silo. The system setting is reasonable and easy to use.

Description

A steel mill sludge treatment system

technical field

The utility model belongs to the technical field of sludge treatment, in particular to a sludge treatment system of a steel mill.

Background technique

After pickling cold-rolled strip steel or electric furnace special steel, the surface needs to be cleaned with water, and the residual acid solution on the surface should be removed with water to form acid-containing wastewater. For acid-containing wastewater, it is inconvenient to transport and clean up. The general method is to use lime for neutralization. The neutralized slurry is clarified, so that the insoluble matter in the slurry settles to the bottom to form sludge, and the liquid on the upper part of the sludge can be recycled and reused. For the generated sludge, it is generally difficult to deal with it. The sludge storage and landfill require land resources, and because the sludge contains a large amount of metals and harmful substances, after being landfilled in the open air, it will be soaked in rainwater. , the sludge will pollute the nearby land and water sources, causing damage to the ecological environment, and reasonable disposal methods are urgently needed.

In the prior art, the Chinese patent application number is: 201710335693.3, and the publication date is: “A system and method for sintering and digesting steelmaking sludge” on 2017.08.04, which includes a sludge direct transportation pipeline and a sintered sludge pre-treatment system. The treatment tank, wherein: a steel-making sludge pump is arranged on the sludge direct transportation pipeline, the sludge direct transportation pipeline is connected with the sintered sludge pretreatment tank, and the sintered sludge pretreatment tank is provided with heating pipelines, compressed gas pipelines and The sludge sintering pipeline, the sintering sludge pump is arranged on the sludge sintering pipeline, and the sintering sludge pipeline is also connected with the sintering sludge nozzle; the compressed gas pipeline is connected with the compressed gas source; the steelmaking sludge is passed through the steelmaking sludge The water pump enters the sintered sludge pretreatment tank through the sludge direct transportation pipeline, stirs it through the compressed gas pipeline, and heats it through the heating pipeline. Using the method of sintering and digesting steelmaking sludge in this system solves the whereabouts of the sludge; however, the sludge has not been dewatered, and the energy consumption rate is high, which is not conducive to production.

The Chinese patent application number is: 201910567255.9, and the announcement date is: 2019.09.13, "A Lightweight Aggregate Prepared by Using Steel Mill Sludge and Its Preparation Method", which discloses a light weight aggregate, which is made of steel mill sludge. The sludge is used as the raw material to prepare the aggregate, and the raw material formula is 10-40% steel mill sludge and 60-90% fly ash. The specific preparation method includes the following steps: the steel mill sludge is dried, pulverized and ground, and sieved. , Add the sieved fly ash according to a certain weight ratio and mix it evenly to form pellets. After drying the raw pellets for a certain period of time, heat treatment is performed, and finally sintered and cooled to obtain finished aggregates. The sludge from the steel mill is used for the preparation of light aggregates, which is a good solution to the whereabouts of the sludge; however, in the process of processing the sludge, it needs to consume a lot of energy for processing, which is not conducive to energy conservation and environmental protection.

The Chinese patent application number is: 201810587630.1, the publication date is: 2018.11.02, "The treatment method of cold rolling acid wastewater and the application of sintered semi-dry desulfurization ash", which discloses a cold rolling acid wastewater treatment method and sintered semi-dry wastewater The application of dry desulfurization ash, which uses sintered semi-dry desulfurization ash to neutralize and treat cold rolling acid wastewater, and uses alkaline substances such as Ca(OH)2, Ca0, CaS03 in sintered semi-dry desulfurization ash to neutralize and treat Cold-rolled acid wastewater, so that the wastewater can reach the reclaimed water reuse standard through aeration, neutralization, PH adjustment, flocculation and sedimentation and other processes; SO ₂ produced in the treatment process can be recovered for the preparation of sulfuric acid; sludge produced in the treatment process After concentration, pressure filtration and dehydration, it can be mixed with blast furnace water slag, and the slag micropowder can be prepared after the vertical grinding process, which can significantly improve the quality of the slag micropowder. It can treat sintered semi-dry desulfurization ash and cold-rolled acid wastewater at the same time, which solves the problem of environmental protection and realizes waste treatment with waste; however, waste water treatment requires a large amount of energy and cannot achieve comprehensive and effective utilization of energy.

SUMMARY OF THE INVENTION

1. The problem to be solved

Aiming at the problems that the sludge produced in the existing steel mill sludge treatment process cannot be effectively treated or the treatment cost is high, the energy consumption is high, and the CO2 emission is high, the utility model provides a steel mill sludge treatment system, which can standardize the treatment of the sludge. , which solves the above problem.

2. Technical solutions

In order to solve the above-mentioned problems, the technical scheme adopted by the present utility model is as follows:

The utility model discloses a sludge treatment system for a steel mill, which comprises a storage bin, a dryer, a separator and a silo. The dryer is respectively connected with the storage bin and the separator. An air inlet pipe is arranged at the bottom of the dryer, one end of which is arranged at one end. An air extraction pipe is provided, and the other end of the air extraction pipe is provided with a valve, which is connected with the separator, and the lower end of the separator is provided with a silo.

As a preference of the present invention, the angle formed between the dryer and the horizontal plane is an acute angle.

As a preference of the present invention, the dryer is formed by sleeves of the outer layer and the inner layer, and a stirring blade is arranged between the outer layer and the inner layer of the sleeve.

As a preference of the present invention, the storage bin and the dryer are connected by a first conveyor, the sludge feed port of the dryer is located at the lower part of the first conveyor, the storage bin is of double opening type, and the upper part is It is used for feeding, and the lower part is used for discharging, and the first conveyor is a shaftless screw conveyor.

As a preferred option of the present invention, it also includes a sintering machine and a blast furnace, a fan is arranged at the bottom of the silo, the silo and the sintering machine are connected by a second conveyor, and the sintering machine is connected to the blast furnace.

As a preferred option of the present invention, a flue gas purification device is also included, and the flue gas purification device, the valve and the separator are connected through a three-way connection.

As a preferred option of the present invention, a thermometer is provided at the joints of the flue gas purification device, the valve and the separator.

3. Beneficial effects

Compared with the prior art, the beneficial effects of the present utility model are:

(1) A steel mill sludge treatment system of the present utility model uses a storage bin for sludge storage. The storage bin adopts an upper and lower double-opening type, the upper part is used for inputting sludge, and the lower end opening takes out the sludge for the next step. , which can realize the continuous feeding of sludge. The bottom of the dryer is provided with an intake channel, and the flue gas is put in through the intake channel. The flue gas flows from bottom to top, and it stays in the dryer for a longer time. The contact time between them is longer, on the one hand, the flue gas has a better drying effect on the sludge, on the other hand, it is easy to remove the solid particles in the sludge flue gas, and the use effect is better;

(2) In a steel mill sludge treatment system of the present invention, the dryer transports the dried sludge to the separator, the sludge and the flue gas are separated by the separator, and the separated sludge can be transported to For use at the next station, the separated flue gas can be returned to the dryer through the valve and exhaust pipe for further use, so that the utilization rate of flue gas is high and the rational and effective use of resources is completed;

(3) A steel mill sludge treatment system of the present utility model, the dryer is composed of inner and outer sleeves, the sludge is between the inner and outer sleeves, the contact area is large, and the drying efficiency is high. When the dryer is placed, if the vertical If it is placed in the horizontal direction, the sludge will easily accumulate at the bottom, which is not conducive to the passage of flue gas. If it is placed in a horizontal direction, the flue gas cannot flow from one end of the dryer to the other end, filling the entire dryer, and during the drying process, the dryer A stirring blade is set in the middle, and the sludge is stirred by the stirring blade, so that the size of the sludge is reduced, so that the sludge is in a moving state, the contact area between the sludge and the flue gas is increased, the drying time of the sludge is reduced, and the More efficient use of flue gas resources;

(4) In a steel mill sludge treatment system of the present invention, after the sludge is dried, it is transported to a sintering machine as a sintering raw material for sintering. Since the sludge is generated by cleaning the surface of the steel, the sludge contains A large amount of iron can replace a part of the original sintering raw materials through the ratio, that is, the sludge is treated, and at the same time, it will not produce pollutants other than sintering when used for sintering, saving resources and easy to use;

(5) In a steel mill sludge treatment system of the present invention, a silo is set at the lower part of the separator for storing the dried sludge for the subsequent sintering process, and the process in which the sludge descends from the silo to the outlet During the process, blockage may occur. By blowing the fan, the dry sludge is in a dynamic state during the downward process, and no blockage will occur. At the same time, the residual flue gas in the silo can be cleaned up, so that the flue gas can return to the separation from the entrance of the silo. in the device;

(6) In a steel mill sludge treatment system of the present invention, whether the flue gas can be returned to the dryer through the exhaust pipe for reuse depends on the temperature of the flue gas, if the temperature of the flue gas after drying is still high, If it is higher than the set value of the thermometer, the valve will be opened, and the flue gas will return to the dryer through the exhaust pipe to continue to be used, otherwise the valve will be closed to purify the flue gas.

Description of drawings

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments, but it should be known that these drawings are only designed for the purpose of explanation, and therefore are not intended to limit the scope of the present invention. Furthermore, unless otherwise indicated, the drawings are intended only to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

Fig. 1 is the structural representation of a kind of sludge treatment device;

In the attached drawings: 1. Storage bin; 2. First conveyor; 3. Dryer; 4. Separator; 5. Silo; 6. Fan; 7. Valve; 8. Exhaust pipe; 9. Flue gas purification device ; 10, the second conveyor; 11, the sintering machine; 12, the blast furnace.

Detailed ways

The following detailed description of exemplary embodiments of the invention refers to the accompanying drawings, which form a part hereof, and which illustrate, by way of example, exemplary embodiments of the invention in which the invention may be practiced. Although these exemplary embodiments have been described in sufficient detail to enable those skilled in the art to practice the invention, it should be understood that other embodiments may be implemented and the invention may be modified without departing from the spirit and scope of the invention. Various changes. The following more detailed descriptions of the embodiments of the present invention are not intended to limit the scope of the present invention as claimed, but are merely for illustration and not to limit the description of the features and characteristics of the present invention, in order to propose the implementation of the present invention. the best mode, and is sufficient to enable those skilled in the art to implement the present invention. Accordingly, the scope of the present invention is to be limited only by the appended claims.

The following detailed description and example embodiments of the invention can be better understood in conjunction with the accompanying drawings, wherein elements and features of the invention are identified by reference numerals.

Example 1

As shown in FIG. 1 , a steel mill sludge treatment system in this embodiment includes a storage bin 1 , a first conveyor 2 , a dryer 3 , a separator 4 , a silo 5 , a fan 6 , a valve 7 , and an exhaust pipe 8 , a flue gas purification device 9 , a second conveyor 10 , a sintering machine 11 and a blast furnace 12 . Through the use of the above-mentioned devices and mechanical components, the sludge produced by the steel mill can be dried. In the process of treatment, the flue gas generated in the production process of the steel mill is introduced, and the residual temperature of the flue gas is used to realize the drying of the sludge. Drying saves the use of energy and realizes waste utilization. At the same time, during the process of flue gas passing through the sludge, the sludge can effectively adsorb solid particles and other harmful substances in the flue gas, saving the consumption of the subsequent treatment of the flue gas. energy, energy saving and environmental protection, and high energy utilization rate.

A first conveyor 2 is arranged at the lower end of the storage bin 1. The storage bin 1 and the dryer 3 are connected by the first conveyor 2. The sludge feed port of the dryer 3 is located at the lower part of the first conveyor 2, and the bottom of the dryer 3 is provided There is an air intake pipe, the dryer 3 is connected with the separator 4, the lower end of the separator 4 is provided with a silo 5, the bottom of the silo 5 is provided with a fan 6, and the silo 5 and the sintering machine 11 are connected by a second conveyor 10, The sintering machine 11 is connected to the blast furnace 12 . A tee is set at the flue gas outlet of the separator 4, and a gas thermometer is set. The other two ends of the tee are respectively provided with a flue gas purification device 9 and a valve 7. The valve 7 is connected to the exhaust pipe 8, and the other end of the exhaust pipe 8 is connected to the drying machine 3.

The above-mentioned steel mill sludge treatment system mainly dries the sludge through the flue gas, and the sludge adsorbs the flue gas, so as to achieve the purpose of energy saving, environmental protection and waste utilization. As shown in Figure 1, place A is the sludge feeding place. , that is, the storage bin 5, which is used for sludge storage through the storage bin 1. The storage bin 1 adopts the upper and lower double opening type, the upper part is used to input the sludge, and the lower end is opened to take out the sludge and carry out the next step. Continuous delivery. The position B is the intake of the flue gas, and the bottom of the dryer 3 is provided with an intake channel, and the flue gas is put into the dryer through the intake channel.

In the above, the first conveyor 2 and the second conveyor 10 are shaftless screw conveyors, and combined with the characteristics of the sludge itself, the conveying efficiency is high. The dryer 3 is formed by sleeved sleeves of the outer layer and the inner layer, a stirring blade is arranged between the outer layer and the inner layer sleeve, and the angle formed between the dryer 3 and the horizontal plane is an acute angle. The dryer 3 is composed of inner and outer sleeves. The sludge is between the inner and outer sleeves. The contact area is large and the drying efficiency is high. When the dryer 3 is placed, if it is placed in a vertical direction, the sludge will easily accumulate at the bottom, which is not conducive to smoke When the flue gas passes through, if it is placed horizontally, the flue gas cannot flow from one end of the dryer to the other, and it fills the entire dryer 3. During the drying process, a stirring blade is set in the dryer 3, and the sludge is cleaned by the stirring blade. Stirring reduces the size of the sludge, makes the sludge in a moving state, increases the contact area between the sludge and the flue gas, reduces the drying time of the sludge, and realizes a more effective use of flue gas resources. The inclination angle of the dryer 3 in this embodiment is 45°, and the flue gas flows from bottom to top, and it stays in the dryer 3 for a longer time, and the contact time between the flue gas and the sludge is longer. The drying effect of the mud is better, on the other hand, it is convenient to remove the solid particles in the sludge flue gas, and the use effect is better.

The separator 4 separates and processes the dried sludge transported in the dryer 3, the dried sludge enters the silo 5, and the flue gas is discharged from the separator 4. The temperature of the flue gas is measured, and whether the flue gas can be returned to the dryer 3 through the exhaust pipe 8 for reuse depends on the temperature of the flue gas. If the temperature of the flue gas after drying is still high, it is higher than the set value of the thermometer. , the valve 7 is opened, and the flue gas returns to the dryer 3 through the exhaust pipe 8 to continue to be used, otherwise the valve 7 is closed to purify the flue gas; the utilization rate of the flue gas is high, and the rational and effective utilization of resources is completed. The lower part of the separator 4 is provided with a silo 5 for storing the dried sludge for the subsequent sintering process. During the process of the sludge descending from the silo 5 to the outlet, blockage may occur. The dried sludge is in a dynamic state during the descending process, and no blockage occurs, and at the same time, the residual flue gas in the silo 5 can be cleaned up, so that the flue gas can be returned to the separator 4 from the inlet of the silo 5 . The flue gas purification device 9 is in the prior art, and any mechanical equipment for flue gas purification in the factory can be used.

The dried sludge is transported from the silo 5 to the sintering machine 11 through the second conveyor 10, and is used as a sintering raw material for sintering. Since the sludge is produced by cleaning the surface of the steel, the sludge contains a large amount of iron, which can be replaced by the ratio of the original. A part of the sintering raw material, that is, the sludge is treated, and it is used for sintering without generating pollutants other than sintering, which saves resources and is easy to use.

Example 2

A steel mill sludge treatment system in this embodiment is basically the same as that in Embodiment 1, except that the angle between the dryer 3 and the horizontal plane is 60°.

Example 3

A steel mill sludge treatment system in this embodiment is basically the same as that in Embodiment 1, except that the angle between the dryer 3 and the horizontal plane is 30°.

Example 4

A steel mill sludge treatment system in this embodiment is basically the same as that in Embodiment 1, except that the angle between the dryer 3 and the horizontal plane is 85°.

Example 5

A steel mill sludge treatment system in this embodiment is basically the same as that in Embodiment 1, except that the angle between the dryer 3 and the horizontal plane is 15°.

Example 6

On the basis of any one of Embodiments 1-5, a method for utilizing sludge in a steel mill of the present embodiment includes the following steps:

S1. The sludge with a water content of 65% (the control of the water content of the sludge is mainly to facilitate transportation and avoid unnecessary waste of resources) is transported to the sludge treatment system of the steel mill through a dump truck, and poured into a storage volume ^of 150m3 Warehouse 1. Close the feeding port of storage bin 1, open the sludge discharge port, and the sludge will be transported to the screw conveyor at the lower part of the storage bin 1 by gravity, and then transported to the dryer 3; The sludge is dried by the flue gas, the residual heat flue gas flow is 12Wm ³ /h, and the drying is performed for 4 hours. During the drying process, the dryer 3 rotates, and the large-particle sludge is dispersed by stirring blades or other dispersing devices. After drying The sludge particles are transported to the separator 4 by the fan 6 .

S2. The dried sludge and flue gas are transported to the separator 4, the dried sludge and flue gas are separated in the separator 4, the dried sludge enters the silo 5, and the flue gas is discharged and separated through the pipeline 4; The separation performed by the separator 4 belongs to the separation of materials, which is the prior art.

S3. The temperature of the flue gas discharged from the separator 4 is measured by a gas thermometer, and the set temperature of the gas thermometer is 140°C (140°C is for the angle of energy utilization, and the lower the temperature, the more effective the sludge drying is. The drying effect is not ideal), the temperature of the flue gas after drying by the dryer 3 is 220 ° C, the flue gas purification device 9 is closed, the valve 7 is opened, and the flue gas is returned to the dryer 3 through the valve 7 and the exhaust pipe 8 for reuse, The sludge in the silo 5 has a water content of 1.0%, an average particle size of 1.5mm, and a CaO content of 26% (the control of the water content avoids affecting the sintering as a sintering raw material. grade).

S4. The dried sludge is transported to the sintering silo 5 by a tanker, and is sintered and blended to the sintering machine 11 at a ratio of 0.5% (excessive proportioning, more impurities will affect the production of the blast furnace 12); It is transported to the blast furnace 12 by a conveyor, and is melted in the blast furnace 12 at a temperature of more than 1550° C. The beneficial elements are utilized, and the impurities become the blast furnace 12 slag for application. The blast furnace 12 is melted at ≥1350° C., beneficial elements Fe, Ca, Mg, C, etc. are utilized, and impurities Si, Al, etc. become blast furnace 12 slag.

In the above method, according to the characteristics of the sludge producing enterprise, the existing low-temperature waste heat resources are used to reduce the amount of sludge pretreatment, and then according to the characteristics of the sludge, the resource utilization is carried out, which solves the problem of sludge occupation, and the equipment is simple to operate. There is no secondary waste to be regenerated, which realizes the real treatment and utilization of sludge. At present, the invention has been put into practical application, and the cost of treatment has been removed, saving the company 51.48 million yuan per year and reducing CO2 emissions by 1,100 tons.

In the process of processing flue gas in steel plants, the flue gas often contains a large amount of particulate matter and organic matter. After the flue gas passes through the sludge, the particulate matter in the flue gas is adsorbed on the sludge, which makes the subsequent treatment of the flue gas easier, and the organic matter in the flue gas is detected, and the organic matter in the flue gas is greatly reduced. Difficulties in the subsequent processing of organics.

The particulate matter and organic matter in the flue gas are placed in the blast furnace 12 after being sintered, and finally become the blast furnace 12 slag.

Example 7

On the basis of any one of Embodiments 1-5, a method for utilizing sludge in a steel mill of the present embodiment includes the following steps:

S1. The sludge with a water content of 55% is transported to the sludge treatment system of the steel mill through a dump truck, and poured into the storage bin 1 with a volume of 120 m ³ . Close the feeding port of storage bin 1 and open the sludge discharge port. The sludge is transported to the screw conveyor at the lower part of the storage bin 1 by gravity and transported to the dryer 3; The flue gas dries the sludge, the residual heat flue gas flow rate is 12Wm ³ /h, and the drying is performed for 3 hours. During the drying process, the dryer 3 rotates, and the large-particle sludge is dispersed by stirring blades or other dispersing devices. After drying The sludge particles are transported to the separator 4 by the fan 6 .

S2. The dried sludge and flue gas are transported to the separator 4, the dried sludge and flue gas are separated in the separator 4, the dried sludge enters the silo 5, and the flue gas is discharged and separated through the pipeline 4; The separation performed by the separator 4 belongs to the separation of materials, which is the prior art.

S3. The temperature of the flue gas discharged from the separator 4 is measured by a gas thermometer. The set temperature of the gas thermometer is 140 °C, the temperature of the flue gas after drying by the dryer 3 is 180 °C, and the flue gas purification device is turned off. 9. Open the valve 7, and the flue gas is returned to the dryer 3 through the valve 7 and the exhaust pipe 8 for reuse.

S4. The dried sludge is transported to the sintering silo 5 through a tanker, and sintered and blended to the sintering machine 11 at a ratio of 0.2%; the sintered material is transported to the blast furnace 12 through the conveyor, and melted at the blast furnace 12 at a temperature of over 1550°C , beneficial elements are utilized, and impurities become blast furnace 12 slag for application.

Example 8

On the basis of any one of Embodiments 1-5, a method for utilizing sludge in a steel mill of the present embodiment includes the following steps:

S1. The sludge with a water content of 58% is transported to the sludge treatment system of the steel mill through a dump truck, and poured into the storage bin 1 with a volume of 100 m ³ . Close the feeding port of storage bin 1 and open the sludge discharge port. The sludge is transported to the screw conveyor at the lower part of the storage bin 1 by gravity and transported to the dryer 3; the flue gas with sintering waste heat of 200°C is introduced to dry the sludge. , the flow rate of waste heat flue gas is 10Wm ³ /h, drying for 2.5 hours, during the drying process, the dryer 3 rotates, and the large particles of sludge are dispersed by stirring blades or other dispersing devices, and the dried sludge particles are transported by the fan 6 to separator 4.

S2. The dried sludge and flue gas are transported to the separator 4, the dried sludge and flue gas are separated in the separator 4, the dried sludge enters the silo 5, and the flue gas is discharged and separated through the pipeline 4; The separation performed by the separator 4 belongs to the separation of materials, which is the prior art.

S3. The temperature of the flue gas discharged from the separator 4 is measured by a gas thermometer. The set temperature of the gas thermometer is 140°C, and the temperature of the flue gas after drying by the dryer 3 is 110°C. Close the valve 7 and open it. The flue gas purification device 9 is used to purify the flue gas. The sludge in the silo 5 has a water content of 1.5%, an average particle size of 1.2 mm, and a CaO content of 22%.

S4. The dried sludge is transported to the sintering silo 5 through a tanker, and sintered and blended to the sintering machine 11 at a rate of 0.4%; the sintered material is then transported to the blast furnace 12 through the conveyor, where it is melted at a temperature of more than 1550°C in the blast furnace 12 , beneficial elements are utilized, and impurities become blast furnace 12 slag for application.

Example 9

On the basis of any one of Embodiments 1-5, a method for utilizing sludge in a steel mill of the present embodiment includes the following steps:

S1. The sludge with a water content of 60% is transported to the sludge treatment system of the steel mill through a dump truck, and poured into the storage bin 1 with a volume of 80 m ³ . Close the feeding port of storage bin 1, open the sludge discharge port, and the sludge will be transported to the screw conveyor at the lower part of the storage bin 1 by gravity, and then transported to the dryer 3; Drying is carried out, the residual heat flue gas flow is 10Wm ³ /h, and the drying is performed for 2 hours. During the drying process, the dryer 3 rotates, and the large particles of sludge are dispersed by stirring blades or other dispersing devices, and the dried sludge particles pass through The fan 6 is delivered to the separator 4 .

S2. The dried sludge and flue gas are transported to the separator 4, the dried sludge and flue gas are separated in the separator 4, the dried sludge enters the silo 5, and the flue gas is discharged and separated through the pipeline 4; The separation performed by the separator 4 belongs to the separation of materials, which is the prior art.

S3. The temperature of the flue gas discharged from the separator 4 is measured by a gas thermometer. The set temperature of the gas thermometer is 140 °C, the temperature of the flue gas after drying by the dryer 3 is 150 °C, and the flue gas purification device is turned off. 9. Open the valve 7, the flue gas is returned to the dryer 3 through the valve 7 and the exhaust pipe 8 for reuse.

S4. The dried sludge is transported to the sintering silo 5 through a tanker, and sintered and blended to the sintering machine 11 at a rate of 0.3%; the sintered material is transported to the blast furnace 12 through the conveyor, and melted at the blast furnace 12 at a temperature of over 1550°C , beneficial elements are utilized, and impurities become blast furnace 12 slag for application.

Claims (7)

1. The utility model provides a steel mill sludge treatment system, its characterized in that, including storing storehouse (1), desiccator (3), separator (4) and feed bin (5), desiccator (3) meet with storing storehouse (1) and separator (4) respectively, and desiccator (3) bottom is provided with admission line, and one end is provided with exhaust tube (8), and the exhaust tube (8) other end is provided with valve (7), and meets with separator (4), separator (4) lower extreme is provided with feed bin (5).

2. A steel mill sludge treatment system according to claim 1, wherein the angle formed between the dryer (3) and the horizontal plane is acute.

3. A steel mill sludge treatment system according to claim 1, wherein the dryer (3) is formed by sleeving an outer sleeve and an inner sleeve, and stirring blades are arranged between the outer sleeve and the inner sleeve.

4. A steel mill sludge treatment system according to claim 1, wherein the storage bin (1) is connected with the dryer (3) through a first conveyor (2), the sludge feeding port of the dryer (3) is positioned at the lower part of the first conveyor (2), the storage bin (1) is of a double-opening type, the upper part is used for feeding, the lower part is used for discharging, and the first conveyor (2) is a shaftless screw conveyor.

5. A steel mill sludge treatment system according to any one of claims 1 to 4, further comprising a sintering machine (11) and a blast furnace (12), wherein a fan (6) is arranged at the bottom of the bin (5), the bin (5) is connected with the sintering machine (11) through a second conveyor (10), and the sintering machine (11) is connected with the blast furnace (12).

6. A steel mill sludge treatment system according to claim 1, further comprising a flue gas purification device (9), wherein the flue gas purification device (9), the valve (7) and the separator (4) are connected by a tee.

7. A steel mill sludge treatment system according to claim 6, wherein a temperature measuring instrument is arranged at the connection of the flue gas purification device (9), the valve (7) and the separator (4).

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