Steel slag pretreatment system

Abstract

The utility model discloses a steel slag pretreatment system which comprises a steel slag crusher, an iron remover is arranged at a feed opening of the steel slag crusher, a feeding scale is arranged at a feed opening of the iron remover, the feeding scale is communicated with a steel slag vertical mill to form a communication channel, a first dust collector is arranged in the communication channel, and the steel slag pretreatment system further comprises a tail exhaust fan, an outlet of the tail exhaust fan is communicated with a kiln tail waste gas pipeline, and a first valve is arranged on the kiln tail waste gas pipeline. The utility model relates to the technical field of cement production, and the steel slag pretreatment system can reduce the content of free calcium in steel slag through activation treatment of heating, pressurizing and carbon adding of kiln tail waste gas, so that the stability and grindability of the steel slag are improved to a certain extent, and the addition amount of converter steel slag in steel slag and slag Portland cement is favorably increased.

Description

Technical Field

[0001] The utility model relates to the technical field of cement production, in particular to a steel slag pretreatment system. Background Art

[0002] Steel slag is an industrial waste residue produced during the steelmaking process, and its production volume can account for 8% to 15% of crude steel production. my country's metallurgical industry inspects more than 100 million tons of steel slag each year, but the current utilization rate is only about 50% to 60%. Steel slag is used as a cement admixture, and its main defects are high hardness, poor grindability, poor hydration activity, and poor stability. Existing steel slag can be used as a raw material for the production of steel slag slag silicate cement. Like other materials, it is ground together with other materials after crushing. On the one hand, it causes great wear on the cement roller press. On the other hand, it is difficult to increase the amount of converter slag added to cement because it has not been fully activated.

[0003] In order to increase the utilization rate of steel slag in cement and improve its activity, a steel slag pretreatment system was developed. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies of the prior art, the utility model provides a steel slag pretreatment system, which solves the problem of low utilization rate of steel slag in the existing cement production.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a steel slag pretreatment system, including a steel slag crusher, the discharge port of the steel slag crusher is provided with an iron remover, the discharge port of the iron remover is provided with a feeding scale, the feeding scale is connected to the steel slag vertical mill to form a conducting channel, and a first dust collector is provided in the conducting channel.

[0008] It also includes a tail exhaust fan, the outlet of which is connected to the kiln tail exhaust gas pipeline, a first valve is arranged on the kiln tail exhaust gas pipeline, the outlet of the kiln tail exhaust gas pipeline is connected to the induced draft fan, two air supply pipelines are installed at the outlet of the induced draft fan, and a second valve is arranged on the air supply pipeline.

[0009] One of the air supply ducts is connected to the steel slag vertical mill, and the other air supply duct is connected to the steel slag carbonization reactor.

[0010] A steel slag powder intermediate bin is arranged below the steel slag vertical mill, and the steel slag powder intermediate bin is connected to the steel slag carbonization reactor through the first elevator.

[0011] A rotary feeder is arranged below the slag carbonization reactor, a conveying trough is arranged below the rotary feeder, the conveying trough is connected with the finished product bin through the second elevator, and a second dust collector is arranged above the conveying trough.

[0012] As a further preferred embodiment, a pressure pump is also included, and the pressure pump is located on the air supply duct between the induced draft fan and the slag carbonization reactor.

[0013] As a further preference, the steel slag carbonization reactor is provided with a temperature and pressure detection gauge and an explosion-proof valve.

[0014] As a further preference, a stirrer extending into the interior of the slag carbonization reactor is installed on the top of the reactor.

[0015] (III) Beneficial effects

[0016] The utility model provides a steel slag pretreatment system, which has the following beneficial effects:

[0017] 1. Utilizing the waste gas from the cement kiln to dry and activate the steel slag for pre-treatment can not only realize the resource utilization of the waste heat from the kiln, but also reduce the carbon emission from the calcination of cement clinker.

[0018] 2. After the activation treatment of kiln tail exhaust gas by heating, pressurizing and carbonizing, the free calcium content in the steel slag can be reduced, so that the stability and grindability of the steel slag can be improved to a certain extent, which is beneficial to increase the addition amount of converter steel slag in steel slag slag silicate cement.

[0019] 3. The system has low cost and simple process, does not require the use of chemicals or other additives, and does not generate new pollutants. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the utility model.

[0021] In the figure: 1. slag crusher; 2. iron remover; 3. feed scale; 4. first dust collector; 5. slag vertical mill; 6. tail exhaust fan; 7. kiln tail exhaust pipe; 8. induced draft fan; 9. first valve; 10. air supply pipe; 11. second valve; 12. slag carbonization reactor; 13. pressure pump; 14. agitator; 15. slag powder intermediate bin; 16. first elevator; 17. rotary feeder; 18. conveying trough; 19. second elevator; 20. finished product bin; 21. temperature and pressure detection gauge; 22. explosion-proof valve; 23. second dust collector. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] like Figure 1 As shown, the utility model provides a technical solution: a steel slag pretreatment system, including a steel slag crusher 1, a discharge port of the steel slag crusher 1 is provided with an iron remover 2, a discharge port of the iron remover 2 is provided with a feeding scale 3, the feeding scale 3 is connected to the steel slag vertical mill 5 and forms a conducting channel, and a first dust collector 4 is provided in the conducting channel.

[0024] It also includes a tail exhaust fan 6, the outlet of which is connected to the kiln tail exhaust gas pipe 7, on which a first valve 9 is arranged, and the outlet of the kiln tail exhaust gas pipe 7 is connected to the induced draft fan 8, on which two air supply pipes 10 are installed, on which a second valve 11 is arranged, and the second valve 11 is used to adjust the air intake volume.

[0025] One of the air supply ducts 10 is connected to the steel slag vertical mill 5 , and the other air supply duct 10 is connected to the steel slag carbonization reactor 12 . The pressure pump 13 is located on the air supply duct 10 between the induced draft fan 8 and the steel slag carbonization reactor 12 .

[0026] A steel slag powder intermediate bin 15 is provided below the steel slag vertical mill 5 , and the steel slag powder intermediate bin 15 is connected to the steel slag carbonization reactor 12 via a first elevator 16 .

[0027] The steel slag carbonization reactor 12 is provided with a temperature and pressure detection gauge 21 and an explosion-proof valve 22, respectively. The temperature and pressure inside the reactor can be detected by the temperature and pressure detection gauge 21. The top of the steel slag carbonization reactor 12 is equipped with a stirrer 14 extending into the interior thereof. The stirrer 14 is in the form of a motor plus a stirring shaft, and the purpose is to uniformly activate the steel slag. A rotary feeder 17 is provided below the steel slag carbonization reactor 12, and a conveying trough 18 is provided below the rotary feeder 17. The conveying trough 18 is connected to the finished product bin 20 through a second elevator 19, and a second dust collector 23 is provided above the conveying trough 18 for dust removal of the steel slag in the conveying trough 18.

[0028] Meanwhile, the contents not described in detail in this specification belong to the prior art known to the professional and technical personnel in this field.

[0029] When in use, the steel slag is first fed into the steel slag crusher 1 for crushing, and then the iron impurities therein are removed by the iron remover 2, and then, after being weighed by the feed scale 3, it is fed into the steel slag vertical mill 5 for finer grinding.

[0030] During the grinding process, waste heat and exhaust gas from the kiln tail are introduced to dry and activate the steel slag for pre-treatment, which can not only realize the resource utilization of waste heat from the kiln tail, but also reduce carbon emissions from cement clinker calcination.

[0031] Afterwards, the steel slag is sent to the steel slag powder intermediate bin 15, and is sent to the steel slag carbonization reactor 12 through the first elevator 16. Similarly, the exhaust gas from the kiln tail is pressurized by the pressure pump 13 and then pumped into the steel slag carbonization reactor 12. The steel slag is activated under high temperature and high pressure environment, which can reduce the free calcium content in the steel slag, and improve the stability and grindability of the steel slag to a certain extent, which is beneficial to increase the addition amount of converter steel slag in steel slag slag silicate cement. Then, the activated steel slag is sent to the finished product bin 20 for standby through the conveying trough 18 and the second elevator 19.

[0032] It should be noted that the electrical components appearing in this article are all connected to the external main controller and 220V or 380V mains electricity, and the main controller can be a conventional known device for controlling computers, etc. Its control principle, internal structure and control switch mode are all conventional means of the prior art, which are directly quoted here without further elaboration. In this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A steel slag pretreatment system, characterized in that: The invention comprises a slag crusher (1), wherein a deironing device (2) is arranged at a feeding port of the slag crusher (1), a feeding scale (3) is arranged at a feeding port of the deironing device (2), the feeding scale (3) is connected to a slag vertical mill (5) to form a conducting channel, and a first dust collector (4) is arranged in the conducting channel; It also comprises a tail exhaust fan (6), the outlet of which is connected to a kiln tail exhaust gas pipeline (7), a first valve (9) is arranged on the kiln tail exhaust gas pipeline (7), the outlet of the kiln tail exhaust gas pipeline (7) is connected to an induced draft fan (8), two air supply pipelines (10) are installed at the outlet of the induced draft fan (8), and a second valve (11) is arranged on the air supply pipeline (10); One of the air supply ducts (10) is connected to the steel slag vertical mill (5), and the other air supply duct (10) is connected to the steel slag carbonization reactor (12); A steel slag powder intermediate bin (15) is arranged below the steel slag vertical mill (5), and the steel slag powder intermediate bin (15) is connected to the steel slag carbonization reactor (12) via a first elevator (16); A rotary feeder (17) is arranged below the slag carbonization reactor (12), a conveying trough (18) is arranged below the rotary feeder (17), the conveying trough (18) is connected to the finished product bin (20) through a second elevator (19), and a second dust collector (23) is arranged above the conveying trough (18).

2. A slag pretreatment system according to claim 1, characterized in that: It also includes a pressure pump (13), which is located on the air supply pipeline (10) between the induced draft fan (8) and the steel slag carbonization reaction kettle (12).

3. A slag pretreatment system according to claim 1, characterized in that: The steel slag carbonization reactor (12) is respectively provided with a temperature and pressure detection gauge (21) and an explosion-proof valve (22).

4. A slag pretreatment system according to claim 1, characterized in that: The top of the steel slag carbonization reactor (12) is provided with a stirrer (14) extending into the interior thereof.

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