CN215844079U

CN215844079U - Lump ore pretreatment system based on belt conveyor

Info

Publication number: CN215844079U
Application number: CN202023098988.XU
Authority: CN
Inventors: 赵强; 魏进超
Original assignee: Zhongye Changtian International Engineering Co Ltd
Current assignee: Zhongye Changtian International Engineering Co Ltd
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2022-02-18
Anticipated expiration: 2030-12-21

Abstract

The utility model provides a lump ore pretreatment system based on a belt conveyor. Wherein: the discharge hole of the lump ore raw material conveying device is connected to the feed inlet positioned at the upper stream of the screening device. And an oversize material discharge port of the screening device is connected to a feed port of the belt type machine through the screened material conveying device. The belt machine is provided with a heat medium inlet and a heat medium outlet. The system adopted by the utility model is simple, practical and reliable, fully utilizes the characteristic of sufficient hot waste gas resources of a steel mill, effectively reduces the pretreatment cost of lump ore, solves the difficult problem of lump ore charging, improves the charging proportion and the air permeability level of blast furnace lump ore, effectively reduces the production cost of the blast furnace, and improves the smooth level of the blast furnace.

Description

Lump ore pretreatment system based on belt conveyor

Technical Field

The utility model provides a pretreatment system, particularly relates to a pretreatment system for lump ore powder and moisture content, and belongs to the technical field of steel smelting.

Background

The consumption of steel as an irreplaceable structural and functional material in the industrialization process occupies more than 95 percent of the total consumption of metal in a long time. The raw pig iron materials required by the iron and steel industry are mainly provided by blast furnace smelting, and the improvement of the blast furnace smelting technology and the reduction of the cost have profound significance for promoting the development of iron and steel enterprises. The basic link of blast furnace intensified smelting is fine material operation, natural lump ore is used as one of main components of charging material, the addition amount of the natural lump ore can reach 20% at most, and as the lump ore contains a large amount of powder with the particle size smaller than 8mm, the airflow distribution in the furnace is abnormal after dust enters the blast furnace, so that the fuel ratio, the coke ratio and the ore consumption are improved. Therefore, the effective screening of the lump ore has important significance for reducing the production cost of the pig iron.

Common furnace charging materials for blast furnaces include sintered ores, pellets and natural lump ores. The reasonable blast furnace charging material structure is that the optimum matching proportion of different types of iron-containing ores is found out by adjusting the proportion of sintered ores, pellets and natural lump ores in the iron ores fed into the furnace, so that various economic and technical indexes of blast furnace smelting under the charging material structure are relatively ideal, and the consumption cost of unit pig iron smelting is relatively lowest. Research shows that the cost expenditure of iron ore and other raw material links accounts for about 60% of the total cost of pig iron, and the improvement of the charging proportion of lump ore is an effective measure for reducing the raw material cost of blast furnaces. At present, the charging proportion of lump ore is generally 5-15%, and the proportion is low, because the charging of lump ore has the following main problems: (1) the lump ore powder content is high, and the amount of the lump ore powder which is not subjected to screening treatment is about 30 percent. After the high-powder lump ore is fed into the furnace, the air permeability level of the blast furnace is reduced, the normal production of the blast furnace is influenced, and the influence on the smooth steel flow and the economic benefit of a steel mill is obvious; (2) the water content of the lump ore is high, generally 8-15%, and the water content of the lump ore in rainy season of individual port steel mills even exceeds 20%. After the high-moisture lump ore is fed into the furnace, energy is consumed for moisture drying, a certain time is needed in the drying process, and the coke ratio of the blast furnace is improved.

At present, due to the fact that the powder material is high in viscosity and high in dust rate, effective grading and granule finishing of lump ore are difficult to achieve through a pre-iron screening technology. As the moisture content of the lump ore reaches 12 percent, the screening effect is not ideal, so that the powder ore adhered to the surface of the lump ore finally enters the blast furnace, the air permeability of the blast furnace is influenced, the smelting cost of the blast furnace is increased, and the stability of the furnace condition is influenced. (1) The lump ore is directly fed into the furnace without being pretreated. Because the lump ore powder content is high and the moisture content is large, the lump ore which is not pretreated is directly fed into the furnace, so that the energy is consumed, the coke ratio of the blast furnace is improved, the air permeability level of the blast furnace is reduced, the normal production of the blast furnace is influenced, and the influence on the smooth steel process and the economic benefit of a steel mill is obvious. (2) And (4) screening and pretreating the lump ore, and directly feeding the lump ore into a furnace. The moisture content of the lump ore after the screening pretreatment is high, energy is consumed for moisture drying after the lump ore is directly fed into the furnace, a certain time is required in the drying process, and the coke ratio of the blast furnace is improved. (3) Drying and pretreating lump ore by a cylinder, and directly feeding into a furnace. The content of lump ore powder after the cylinder drying pretreatment is still higher, and after the high-powder lump ore enters the furnace, the air permeability level of the blast furnace is reduced, the normal production of the blast furnace is influenced, and the influence on the smooth operation of the steel process and the economic benefit of a steel mill is obvious. The cylinder drying investment is large, the operation cost is high, lump ores are crushed due to mutual extrusion in the drying process to generate new powder, and the influence on the air permeability of the blast furnace is large after the lump ores are fed into the furnace.

Therefore, the reduction of the water content in the lump ore has important significance for reducing the iron-making cost and enhancing the stability of the furnace condition. At present, lump ore drying systems have the difficult problems of high construction cost, low drying efficiency, high energy consumption and the like.

SUMMERY OF THE UTILITY MODEL

The utility model carries out targeted pretreatment aiming at two problems of lump ore entering a furnace, and aims to solve the technical problems as follows: (1) the lump ore powder content is high, and the amount of the lump ore powder which is not subjected to screening treatment is about 30 percent. The screening process is adopted, and according to the characteristic that the powder of the lump ore materials is high in viscosity, the powder in the lump ore is efficiently screened out by using the screen body made of special materials and in a special shape; (2) the lump ore has high moisture content. The utility model adopts the belt type machine drying process, utilizes the characteristic of abundant hot waste gas resources in the steel process, introduces the hot waste gas into the belt type machine nearby, dries the materials in the belt type machine, and reduces the moisture of lump ore. The system adopted by the utility model is simple, practical and reliable, fully utilizes the characteristic of sufficient hot waste gas resources of a steel mill, effectively reduces the pretreatment cost of lump ore, solves the difficult problem of lump ore charging, improves the charging proportion and the air permeability level of blast furnace lump ore, effectively reduces the production cost of the blast furnace, and improves the smooth level of the blast furnace.

According to a first embodiment of the utility model, a belt-machine-based lump ore pretreatment system is provided.

The utility model provides a lump ore pretreatment systems based on belt conveyor, this system includes lump ore raw materials conveyor, screening plant, material conveyor after the screening, belt conveyor. Wherein: the discharge hole of the lump ore raw material conveying device is connected to the feed inlet of the screening device positioned at the upstream of the screening device. And an oversize material discharge port of the screening device is connected to a belt type machine feed inlet of the belt type machine through the screened material conveying device. The belt machine is provided with a heat medium inlet and a heat medium outlet.

Preferably, the system further comprises a sinter batch system. And a screen underflow discharge port is formed at the bottom of the screening device. The screen underflow discharge port is connected to the sintering batching system through a conveying device.

Preferably, the system further comprises a blast furnace. The tail of the belt conveyor is provided with a dry material outlet. The dried material outlet is connected to the feed inlet of the blast furnace.

In the utility model, the screening device is a strong screen, a corrugated screen or a cantilever screen.

Preferably, the sieve mesh size of the sieving device is 5-30 mm, preferably 6-10 mm.

Preferably, the heat medium inlet is provided at the lower part or bottom of the lump ore belt conveyor. The heat medium outlet is arranged at the upper part or the top of the belt machine.

Preferably, the blast furnace is provided with a high-temperature waste gas outlet. The high-temperature waste gas outlet is communicated with the heat medium inlet through a heat medium conveying pipeline.

Preferably, a moisture detection device is arranged at a dried material outlet of the belt conveyor.

According to a second embodiment of the present invention, another belt-based lump ore pretreatment system is provided.

A lump ore pretreatment system based on a belt conveyor comprises a lump ore raw material conveying device and the belt conveyor. Wherein: the discharge port of the lump ore raw material conveying device is connected to the feed port of the belt conveyor. The belt machine is provided with a heat medium inlet and a heat medium outlet. The belt type machine is internally provided with a grate bar. The gaps among the grate bars are 3-10 mm, preferably 5-8 mm.

Preferably, the system further comprises a sinter batch system. And a powder discharge port is formed at the bottom of the belt type machine. The powder discharge port is connected to the sintering batching system through a conveying device.

The first lump ore pretreatment system (first embodiment) provided by the utility model is used for pretreating lump ores, and the method comprises the following steps:

1) screening: after the lump ore enters the screen surface of the screen, the powder attached to the lump ore is screened out under the vibration condition. The oversize material enters a belt type machine for drying treatment, and the undersize material returns to a sintering batching system;

2) and (3) drying: hot waste gas is introduced into the belt conveyor to dry lump ore, and the hot waste gas is introduced from the bottom of the belt conveyor and is discharged from the upper part of the belt conveyor; the lump ore is discharged from the head part of the belt type machine, the tail part of the belt type machine is discharged, and after the belt type machine is dried for a certain time, the moisture of the lump ore is removed due to gas-solid heat exchange.

The second lump ore pretreatment system (second embodiment) provided by the utility model is used for pretreating the lump ore, and the method comprises the following steps:

screening and drying are carried out simultaneously: after the lump ore enters the belt conveyor, introducing a heat medium into the belt conveyor, introducing hot waste gas from the bottom of the belt conveyor, and discharging the hot waste gas from the upper part of the belt conveyor; the lump ore is discharged from the head part of the belt type machine, the tail part of the belt type machine is discharged, and after the belt type machine is dried for a certain time, the moisture of the lump ore is removed due to gas-solid heat exchange. Drying the lump ore in a belt type machine, and simultaneously screening the lump ore by using a grate bar of the belt type machine as a screen; in the process of drying materials on the belt conveyor, the materials are in a dispersed state, the belt conveyor dries the lump ore and moves forwards, the vibration effect is achieved, the screening effect of the belt conveyor on the lump ore is enhanced, powder in the lump ore falls into the lower part of the belt conveyor after passing through the grate bars, and the materials above the grate bars of the belt conveyor enter the blast furnace after being dried; and conveying the powder below the grate to a sintering batching system for utilization.

In the present invention, the size of the screen hole in the screening step is 5 to 30mm, preferably 6 to 10 mm. The screen surface is a plane strong screen or a corrugated screen, and the plane strong screen is preferred. The number of the screen surfaces is 1-5, preferably 1-3. The sieve number is 1 ~ 2, and preferred is 2, each other for reserve, removes through the pulley during the change.

In the utility model, the advantages of the grate bars in the belt type machine can be utilized, the grate bars simultaneously play the role of a screen, and the gaps among the grate bars are 3-10 mm, preferably 5-8 mm.

In the utility model, the temperature of hot waste gas in the drying process is 100-300 ℃, and preferably 150-250 ℃; the drying time is 0.2-4 h, preferably 0.5-2 h. The hot air flow (the flow rate of the heat medium) is 100000-300000 m³Preferably from 150000 to 200000m³/h。

In the utility model, a pretreatment method of screening and drying is provided aiming at the problems of high powder content and large moisture of natural lump ore; removing powder attached to the lump ore through a screening process, feeding oversize products obtained in the screening process into a belt type machine drying system, and returning undersize products to a sintering batching system; and (4) drying and pretreating oversize products in a belt type machine to remove moisture of lump ores, wherein a heat source required by drying is hot waste gas of a steel mill. Or, the belt conveyor is adopted to dry the lump ore, and the lump ore is simultaneously screened and processed by utilizing the characteristics of the grate bars on the belt conveyor, so that the purpose that one device realizes two functions (screening and drying) is realized. Compared with the traditional cylinder drying process, the screening and belt type machine drying pretreatment technology adopted by the utility model has the advantages of good screening effect of the powder of the lump ore and high moisture removal efficiency, solves the difficult problem of lump ore entering the blast furnace, improves the proportion of the lump ore entering the blast furnace and the air permeability level, effectively reduces the production cost of the blast furnace, and improves the smooth level of the blast furnace. The method has good economic benefit, social benefit and environmental benefit, and is expected to open up a more stable and efficient way for the development of the lump ore pretreatment process in China.

In the utility model, the strong screen consists of a screen plate and a bracket, and the screen plate is vibrated left and right by the extension and contraction of a spring at the lower part of the screen plate so as to realize the screening of lump ores. In the screening process, the amplitude range of the bottom spring is 15-20mm, and small-particle-size lump ores are separated through the openings in the screen plate. In the actual production, a multi-section screen surface vibration mode is adopted, so that the grading separation of lump ores with different grain diameters is realized, and the processing capacity can reach 800 t/h.

In the utility model, the vibration excitation device of the corrugated screen can adjust the process parameters of the vibration excitation force according to the physical characteristics of the screened lump ore, so that the materials are loosened and separated under the action of 50-100 g of gravity acceleration. During the screening process, the screen plate is continuously vibrated within the range of 15-20mm, so that fine particles smaller than 8mm in the lump ore reach the openings of the screen holes and pass through the screen. In the operation process, the screening of the lump ore can be realized by adjusting the opening size and the opening rate of the sieve plate according to the powder content in the lump ore, and the processing capacity can reach 500 t/h.

In the utility model, the vibrating screen of the cantilever screen consists of an upper layer of straight bar screen bars and a lower layer of mesh bar screen bars, wherein the gaps of the straight bar screen bars are 8.0-12.0mm, the gaps of the lower layer of mesh bar screen bars are 6.5-8.0mm, and the design of the double-layer screen mesh can accurately control the separation of lump ores. The screening process is completed through two steps, firstly, materials with the particle size of less than 12.0mm fall to the lower layer of net-shaped screen bars through the upper layer of straight bar screen bars, then the materials with the particle size of less than 6.5mm are further separated through the net-shaped screen bars, fine particles with the particle size of less than 8mm in the materials are separated through the synergistic vibration of the upper layer of screen bars and the lower layer of screen bars, the maximum feeding particle size can reach 300mm, the screening efficiency can reach more than 85%, and the processing capacity can reach 700 t/h.

According to the block ore pretreatment system provided by the utility model, natural block ores are conveyed to the screening device through the block ore raw material conveying device, the block ores are screened according to the granularity or the particle size through the screening device, and oversize materials meeting the requirement of the particle size on the screen are conveyed to the belt conveyor through the screened material conveying device; the lump ore with large particle size is dried in a belt conveyor to reduce the moisture content in the lump ore. And then conveying the lump ore subjected to particle size screening and water content reduction to a blast furnace for smelting.

In the utility model, after the lump ore is sieved and separated, undersize materials of the sieving device can be conveyed to a sintering batching system, and the undersize materials enter a sintering process.

Preferably, the belt type machine is used as the drying device, so that lump ore is fully contacted with a heat medium, the dehydration effect of the lump ore is improved, the moisture content in the lump ore before entering the blast furnace meets the requirement, the energy consumption of the blast furnace is reduced, the normal operation of blast furnace procedures is ensured, the quality of blast furnace products is improved, and meanwhile, the production cost is saved.

In the utility model, a moisture detection device is arranged at a dried material outlet of the belt type machine. The moisture detection device is used for detecting the moisture content of the lump ore after the lump ore enters the belt conveyor for drying treatment, so that the quality of the lump ore entering the blast furnace is ensured.

In the present invention, the belt conveyor may be any drying device using a caterpillar type, such as a chain grate.

Through the lump ore pretreatment system, the average grain diameter of the lump ore entering the blast furnace is more than 8mm, and the powder content (weight ratio of materials less than 8 mm) in the lump ore is less than 5 percent; the water content of the lump ore entering the blast furnace is lower than 4 percent.

By adopting the lump ore pretreatment system, the input amount of the lump ore in the blast furnace can be increased, and the original (not subjected to screening and drying pretreatment) 5-15% is increased to 20-30%, so that various economic and technical indexes of blast furnace smelting under the furnace charge structure are relatively ideal, and the consumption cost of unit pig iron smelting is relatively lowest.

Compared with the prior art, the technical scheme of the utility model has the following beneficial technical effects:

1. the powder removal rate is high. The utility model adopts the screening process, and utilizes the screen body made of special materials and in special shape to efficiently screen out the powder in the lump ore according to the characteristic of strong stickiness of the powder of the lump ore material.

2. The moisture removal effect is good. The utility model adopts a drying process, utilizes the characteristic of abundant hot waste gas resources in the steel process, introduces the hot waste gas into the belt conveyor nearby, and directly dries the materials on the belt conveyor to reduce the moisture of lump ore.

3. The utility model can also adopt a belt type machine to dry the lump ore and simultaneously screen the lump ore by utilizing the characteristics of the grate bars on the belt type machine, thereby realizing the effect of realizing two functions (screening and drying) by one device.

4. The method adopted by the utility model is simple, practical and reliable, fully utilizes the characteristic of sufficient hot waste gas resources of a steel mill, effectively reduces the pretreatment cost of lump ore, solves the difficult problem of lump ore charging, improves the charging proportion and the air permeability level of blast furnace lump ore, effectively reduces the production cost of the blast furnace, and improves the smooth level of the blast furnace.

Drawings

FIG. 1 is a schematic structural diagram of a belt-based lump ore pretreatment system according to the present invention;

FIG. 2 is a schematic structural diagram of a sintering and batching system, a blast furnace and other components arranged in a belt-type machine-based lump ore pretreatment system;

FIG. 3 is a schematic diagram of another design structure of a belt-type machine-based lump ore pretreatment system of the utility model;

FIG. 4 is a schematic structural diagram of a sintering batching system, a blast furnace and other components in another design of the belt-type machine-based lump ore pretreatment system.

Reference numerals:

1: a lump ore raw material conveying device; 2: a screening device; 201: a feed inlet of the screening device; 202: an oversize material outlet of the screening device; 203: a screen underflow outlet of the screening device; 3: a screened material conveying device; 4: a belt machine; 401: a feed inlet of the belt machine; 402: a thermal medium inlet on the belt machine; 403: a thermal medium outlet on the belt machine; 404: a dried material outlet of the belt machine; 405: grid section; 406: a powder discharge port of the belt type machine; 5: a sintering batching system; 6: a blast furnace; 601: a high temperature exhaust gas outlet of the blast furnace; 7: a moisture detection device; l0: a heat medium delivery pipe.

Detailed Description

The technical solution of the present invention is illustrated below, and the claimed scope of the present invention includes, but is not limited to, the following examples.

A lump ore pretreatment system based on a belt conveyor comprises a lump ore raw material conveying device 1, a screening device 2, a screened material conveying device 3 and a belt conveyor 4. Wherein: the discharge port of the lump ore feed conveyor 1 is connected to the screening device feed port 201 upstream of the screening device 2. The oversize product outlet 202 of the screening device 2 is connected to the belt feed inlet 401 of the belt machine 4 via the screened material conveying device 3. The belt conveyor 4 is provided with a heat medium inlet 402 and a heat medium outlet 403.

Preferably, the system further comprises a sinter batch system 5. The bottom of the screening device 2 is provided with a screen underflow outlet 203. The undersize discharge port 203 is connected to the sintering batching system 5 through a conveying device.

Preferably, the system further comprises a blast furnace 6. The tail of the belt conveyor 4 is provided with a dried material outlet 404. The dried material outlet 404 is connected to the feed inlet of the blast furnace 6.

In the present invention, the screening device 2 is a strong screen, a corrugated screen or a cantilever screen.

Preferably, the sieve mesh size of the sieving device 2 is 5-30 mm, preferably 6-10 mm.

Preferably, the heat medium inlet 402 is provided at the lower part or bottom of the lump ore belt conveyor 4. The heat medium outlet 403 is provided at the upper part or top of the belt conveyor 4.

Preferably, the blast furnace 6 is provided with a high-temperature exhaust gas outlet 601. The high-temperature exhaust gas outlet 601 communicates with the heat medium inlet 402 through the heat medium delivery pipe L0.

Preferably, a moisture detection device 7 is arranged at the dried material outlet of the belt conveyor 4.

A lump ore pretreatment system based on a belt conveyor comprises a lump ore raw material conveying device 1 and a belt conveyor 4. Wherein: the discharge port of the lump ore raw material conveying device 1 is connected to the belt conveyor feed port 401 of the belt conveyor 4. The belt conveyor 4 is provided with a heat medium inlet 402 and a heat medium outlet 403. A grate bar 405 is arranged in the belt conveyor 4. The gaps between the grate bars 405 are 3-10 mm, preferably 5-8 mm.

Preferably, the system further comprises a sinter batch system 5. The bottom of the belt conveyor 4 is provided with a powder discharge port 406. The powder discharge port 406 is connected to the sintering proportioning system 5 through a conveying device.

Example 1

As shown in fig. 1, the lump ore pretreatment system based on the belt conveyor comprises a lump ore raw material conveying device 1, a screening device 2, a screened material conveying device 3 and a belt conveyor 4. Wherein: the discharge port of the lump ore feed conveyor 1 is connected to the screening device feed port 201 upstream of the screening device 2. The oversize product outlet 202 of the screening device 2 is connected to the belt feed inlet 401 of the belt machine 4 via the screened material conveying device 3. The belt conveyor 4 is provided with a heat medium inlet 402 and a heat medium outlet 403.

Example 2

As shown in fig. 2, the lump ore pretreatment system based on the belt conveyor comprises a lump ore raw material conveying device 1, a screening device 2, a screened material conveying device 3 and a belt conveyor 4. Wherein: the discharge port of the lump ore feed conveyor 1 is connected to the screening device feed port 201 upstream of the screening device 2. The oversize product outlet 202 of the screening device 2 is connected to the belt feed inlet 401 of the belt machine 4 via the screened material conveying device 3. The belt conveyor 4 is provided with a heat medium inlet 402 and a heat medium outlet 403. The system also includes a sinter batch system 5. The bottom of the screening device 2 is provided with a screen underflow outlet 203. The undersize discharge port 203 is connected to the sintering batching system 5 through a conveying device. The system also includes a blast furnace 6. The tail of the belt conveyor 4 is provided with a dried material outlet 404. The dried material outlet 404 is connected to the feed inlet of the blast furnace 6. The heat medium inlet 402 is provided at the lower part or bottom of the lump ore belt conveyor 4. The heat medium outlet 403 is provided at the upper part or top of the belt conveyor 4.

The system is adopted to pretreat the lump ore, and the average grain diameter of the pretreated lump ore before entering the blast furnace is 12 mm.

Example 3

Example 2 was repeated except that the blast furnace 6 was provided with a high-temperature exhaust gas outlet 601. The high-temperature exhaust gas outlet 601 communicates with the heat medium inlet 402 through the heat medium delivery pipe L0.

Example 4

Example 2 was repeated except that the dried material outlet of the belt conveyor 4 was provided with a moisture detection device 7. And detecting the moisture content in the lump ore processed by the belt conveyor, so that the moisture content of the lump ore entering the blast furnace is lower than 4%.

Example 5

Example 3 was repeated except that the screening device 2 was a power screen.

Example 6

Example 4 was repeated except that the screening device 2 was a corrugated screen.

Example 7

Example 3 was repeated except that the screening device 2 was a cantilever screen.

Example 8

Example 5 was repeated except that the screening device 2 had a mesh size of 8 mm.

Example 9

As shown in fig. 3, the lump ore pretreatment system based on the belt conveyor comprises a lump ore raw material conveying device 1 and a belt conveyor 4. Wherein: the discharge port of the lump ore raw material conveying device 1 is connected to the belt conveyor feed port 401 of the belt conveyor 4. The belt conveyor 4 is provided with a heat medium inlet 402 and a heat medium outlet 403. A grate bar 405 is arranged in the belt conveyor 4. The gaps between the grate bars 405 are 8 mm.

Example 10

As shown in fig. 4, the lump ore pretreatment system based on the belt conveyor comprises a lump ore raw material conveying device 1 and the belt conveyor 4. Wherein: the discharge port of the lump ore raw material conveying device 1 is connected to the belt conveyor feed port 401 of the belt conveyor 4. The belt conveyor 4 is provided with a heat medium inlet 402 and a heat medium outlet 403. A grate bar 405 is arranged in the belt conveyor 4. The gaps between the grate bars 405 are 8 mm. The system also includes a sinter batch system 5. The bottom of the belt conveyor 4 is provided with a powder discharge port 406. The powder discharge port 406 is connected to the sintering proportioning system 5 through a conveying device. The system also includes a blast furnace 6. The tail of the belt conveyor 4 is provided with a dried material outlet 404. The dried material outlet 404 is connected to the feed inlet of the blast furnace 6.

The system is adopted to pretreat the lump ore, and the average grain diameter of the pretreated lump ore before entering the blast furnace is 14 mm.

Example 11

Example 10 was repeated except that the heat medium inlet 402 was provided at the lower part or bottom of the lump-ore belt conveyor 4. The heat medium outlet 403 is provided at the upper part or top of the belt conveyor 4.

Example 12

Example 11 was repeated except that the blast furnace 6 was provided with a high-temperature exhaust gas outlet 601. The high-temperature exhaust gas outlet 601 communicates with the heat medium inlet 402 through the heat medium delivery pipe L0.

Example 13

Example 11 was repeated except that the dried material outlet of the belt conveyor 4 was provided with a moisture detecting device 7. And detecting the moisture content in the lump ore processed by the belt conveyor, so that the moisture content of the lump ore entering the blast furnace is lower than 4%.

Claims

1. The utility model provides a lump ore pretreatment systems based on belt machine which characterized in that: the system comprises a lump ore raw material conveying device (1), a screening device (2), a screened material conveying device (3) and a belt type machine (4); wherein: a discharge hole of the lump ore raw material conveying device (1) is connected to a feeding hole (201) of the screening device positioned at the upstream of the screening device (2), and an oversize material discharge hole (202) of the screening device (2) is connected to a belt type machine feeding hole (401) of a belt type machine (4) through the screened material conveying device (3); the belt conveyor (4) is provided with a heat medium inlet (402) and a heat medium outlet (403).

2. The lump ore pretreatment system of claim 1, wherein: the system also comprises a sintering batching system (5), wherein a screen underflow discharge hole (203) is formed in the bottom of the screening device (2); the screen underflow discharge port (203) is connected to the sintering proportioning system (5) through a conveying device.

3. The lump ore pretreatment system according to claim 1 or 2, wherein: the system also comprises a blast furnace (6), and a dry material outlet (404) is arranged at the tail of the belt conveyor (4); the dried material outlet (404) is connected to the feed inlet of the blast furnace (6).

4. The lump ore pretreatment system according to claim 1 or 2, wherein: the screening device (2) is a strong screen, a corrugated screen or a cantilever screen.

5. The lump ore pretreatment system of claim 3, wherein: the screening device (2) is a strong screen, a corrugated screen or a cantilever screen.

6. The lump ore pretreatment system of claim 4, wherein: the sieve mesh size of the screening device (2) is 5-30 mm.

7. The lump ore pretreatment system of claim 5, wherein: the sieve mesh size of the screening device (2) is 5-30 mm.

8. The lump ore pretreatment system according to claim 6 or 7, wherein: the sieve mesh size of the screening device (2) is 6-10 mm.

9. The lump ore pretreatment system of claim 3, wherein: the heat medium inlet (402) is arranged at the lower part or the bottom of the lump ore belt conveyor (4), and the heat medium outlet (403) is arranged at the upper part or the top of the belt conveyor (4).

10. The lump ore pretreatment system of claim 4, wherein: the heat medium inlet (402) is arranged at the lower part or the bottom of the lump ore belt conveyor (4), and the heat medium outlet (403) is arranged at the upper part or the top of the belt conveyor (4).

11. The lump ore pretreatment system of claim 3, wherein: the blast furnace (6) is provided with a high-temperature waste gas outlet (601), and the high-temperature waste gas outlet (601) is communicated with the heat medium inlet (402) through a heat medium conveying pipeline (L0).

12. The lump ore pretreatment system of claim 3, wherein: and a moisture detection device (7) is arranged at a dried material outlet of the belt conveyor (4).

13. The lump ore pretreatment system of claim 4, wherein: and a moisture detection device (7) is arranged at a dried material outlet of the belt conveyor (4).

14. The utility model provides a lump ore pretreatment systems based on belt machine which characterized in that: the system comprises a lump ore raw material conveying device (1) and a belt type machine (4); wherein: a discharge hole of the lump ore raw material conveying device (1) is connected to a belt conveyor feed hole (401) of a belt conveyor (4); the belt conveyor (4) is provided with a heat medium inlet (402) and a heat medium outlet (403); the belt type machine (4) is internally provided with grate bars (405), and gaps among the grate bars (405) are 3-10 mm.

15. The lump ore pretreatment system of claim 14, wherein: the gaps between the grate bars (405) are 5-8 mm.

16. The lump ore pretreatment system of claim 14 or 15, wherein: the system also comprises a sintering and batching system (5), wherein a powder material outlet (406) is formed in the bottom of the belt type machine (4); the powder discharge port (406) is connected to the sintering batching system (5) through a conveying device.

17. The lump ore pretreatment system of claim 14 or 15, wherein: the system also comprises a blast furnace (6), and a dry material outlet (404) is arranged at the tail of the belt conveyor (4); the dried material outlet (404) is connected to the feed inlet of the blast furnace (6).

18. The lump ore pretreatment system of claim 16, wherein: the system also comprises a blast furnace (6), and a dry material outlet (404) is arranged at the tail of the belt conveyor (4); the dried material outlet (404) is connected to the feed inlet of the blast furnace (6).

19. Lump ore pretreatment system according to any one of claims 1-2, 5-7, 9-15, 18, characterized in that: the heat medium inlet (402) is arranged at the lower part or the bottom of the lump ore belt conveyor (4), and the heat medium outlet (403) is arranged at the upper part or the top of the belt conveyor (4).

20. The lump ore pretreatment system of claim 17, wherein: the blast furnace (6) is provided with a high-temperature waste gas outlet (601), and the high-temperature waste gas outlet (601) is communicated with the heat medium inlet (402) through a heat medium conveying pipeline (L0).

21. The lump ore pretreatment system of claim 18, wherein: the blast furnace (6) is provided with a high-temperature waste gas outlet (601), and the high-temperature waste gas outlet (601) is communicated with the heat medium inlet (402) through a heat medium conveying pipeline (L0).

22. The lump ore pretreatment system as claimed in any one of claims 1 to 2, 5 to 7, 9 to 15, 18, 20 to 21, wherein: and a moisture detection device (7) is arranged at a dried material outlet of the belt conveyor (4).