Method for recycling sintered waste activated carbon powder

Abstract

The invention relates to the technical field of sintering technology and environmental resources in the iron and steel industry, in particular to a method for recycling sintered waste activated carbon powder, which comprises the following steps: mixing waste activated carbon powder with a flux and iron ore concentrate to prepare small balls with different carbon contents; the method has the beneficial effects that the waste activated carbon is efficiently and fully utilized in the longitudinal sintering direction, and the purposes of reducing the consumption of sintering solid fuel, improving the sintering efficiency and improving the sintering quality are achieved. Heat required by effective mineralization of the upper portion and the edge of the sintering trolley is improved, the quality of sintered ore on the upper layer and the edge of the sintering trolley is improved, and finally the purpose of reducing production and operation cost is achieved.

Description

Technical Field

[0001] The present invention relates to the technical fields of sintering technology and environmental resource technology in the iron and steel industry, and particularly relates to a method for recycling waste activated carbon powder in sintering. Background Art

[0002] Sintering is one of the important links in the iron-making process. A large amount of flue gas is released during this process, and the released flue gas contains a large number of particulate matters, SO2, NOX, dioxins and other gaseous pollutants. More than 60% of the total SO2 emissions of iron and steel enterprises. At present, the activated carbon desulfurization and denitrification process is one of the important ways to purify sintering flue gas.

[0003] At present, most of the activated carbon used for desulfurization and denitrification in industry is made from high-quality wood chips, coconut shells and other biomass and coal as raw materials. After being heated at high temperature, it is made into a cylinder with a diameter of about 1 cm. The activated carbon has a rich pore structure on the surface, stable chemical properties, and good adsorption performance. Inevitably, a certain amount of activated carbon powder is generated due to friction and collision in the adsorption system and the desorption system.

[0004] At present, some iron and steel enterprises blow waste activated carbon instead of part of the pulverized coal into the blast furnace, realizing the recycling of solid waste in the steel plant. However, due to the difference in the performance of activated carbon and pulverized coal blown into the blast furnace, the use effect is affected. Some iron and steel enterprises also use waste activated carbon instead of part of the coke powder or anthracite directly in the sintering process, but still face some technical challenges. Due to the characteristics of activated carbon powder such as low density, large specific surface area, loose structure, low ignition point, fast combustion speed and short combustion duration, there is a difference in the combustion rate of coke powder or anthracite pulverized coal. If the addition ratio is too large, the high-temperature time of sintering is short, affecting the ore-forming time and quality of sintered ore. Moreover, the activated carbon powder in the lower layer of the pallet is easily sucked away by the wind and enters the sintering dust, and it cannot be efficiently recycled. Therefore, it is necessary to further study and optimize the sintering feeding process to improve the application efficiency of activated carbon powder in iron ore sintering. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a method for recycling waste activated carbon powder in sintering. The waste activated carbon powder is mixed with a flux and iron ore concentrate to prepare small balls with different carbon contents, and through a feeding device, it is added to the sintering pallet mixture in a gradient stratification and precise fixed-point and quantitative manner through the roll gap of a nine-roll feeder, so that the waste activated carbon is efficiently and fully utilized in the longitudinal direction of sintering, achieving the reduction of sintering solid fuel consumption, enhancing the heat required for effective ore formation in the upper part and the edges of the sintering pallet, improving the quality of sintered ore in the upper layer and the edges of the sintering pallet, and finally achieving the purpose of reducing production operation costs.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for recycling sintered waste activated carbon powder, wherein the waste activated carbon powder is mixed with a flux and iron concentrate to prepare pellets with different carbon contents. The pellets are then added to a sintering trolley mixture in a gradient layered manner through the gap between the rollers of a nine-roller distributor and precisely and quantitatively. The method for recycling sintered waste activated carbon powder comprises the following:

[0008] (1) adding iron ore powder, return ore, flux, and solid fuel into a mixer for mixing, and preparing and obtaining a sintering mixture A;

[0009] (2) batching, mixing, granulating, and drying the waste activated carbon powder, flux, iron ore powder, and returned ore to obtain a low-carbon mixture B;

[0010] (3) batching, mixing, granulating, and drying the waste activated carbon powder, flux, iron ore powder, and return ore to obtain a high-carbon mixture C;

[0011] (4) Lay a sintering base material layer on the top of the sintering trolley to prevent the sintering temperature from being too high and burning the grate bars;

[0012] (5) The sintering mixture A prepared in step (1) is normally paved on the sintering base material layer through a mud roller + nine-roller distributor;

[0013] (6) The low-carbon mixture B prepared in step (2) is evenly spread in the sintered mixture A along the horizontal direction of the trolley through the gaps between the 9th roller and the 8th roller, and between the 8th roller and the 7th roller of the nine-roller distributor;

[0014] (7) The high-carbon mixture C prepared in step (3) is evenly spread in the sintered mixture A along the horizontal direction of the trolley through the gaps between the first and second rollers, the second and third rollers, and the third and fourth rollers of the nine-roller distributor through the distribution device;

[0015] (8) The sintered mixture is leveled, ignited, and then sintered to form ore.

[0016] Furthermore, the components of the sintering mixture A in step (1) are as follows in terms of mass percentage: TFe∈[49%, 54%], CaO / SiO2∈[1.7, 2.2], Al2O3∈[1.0%, 2.3%], C∈[3.5%, 4.0%], and the rest are solvents and impurities; wherein, the weight percentage of the sintering mixture A is less than 6% for the particle size <1 mm, the weight percentage of the particle size between 1 and 5 mm is 90% to 95%, and the weight percentage of the particle size ≥5 mm is less than 6%.

[0017] Further, the components in the low-carbon mixture B in step (2) are as follows by mass percentage: TFe ∈ [50%, 53%], CaO / SiO2 ∈ [1.8, 2.0], Al2O3 ∈ [1.2%, 2.0%], C ∈ [2.0%, 3.0%], and the rest are solvents and impurities; among them, the particle size <1mm in the sintering mixture A accounts for less than 30% by mass percentage, the particle size between 1 and 5mm accounts for 60% - 75% by mass percentage, and the particle size ≥5mm accounts for less than 30% by mass percentage.

[0018] Further, the components in the high-carbon mixture C in step (3) are as follows by mass percentage: TFe ∈ [50%, 53%], CaO / SiO2 ∈ [1.8, 2.0], Al2O3 ∈ [1.2%, 2.0%], C ∈ [4.0%, 6.0%], and the rest are solvents and impurities; among them, the particle size <1mm in the sintering mixture A accounts for less than 20% by mass percentage, the particle size between 1 and 5mm accounts for 75% - 85% by mass percentage, and the particle size ≥5mm accounts for less than 20% by mass percentage.

[0019] Further, in step (6), the feeding device is provided with two rows of feeding pipes along the transverse direction of the trolley through the two roller gap positions between the 9th roller and the 8th roller, and between the 8th roller and the 7th roller of the nine-roller feeder. Each row has 20 - 30 pipes, and the feeding amount of each feeding pipe is adjustable.

[0020] Further, in step (7), the feeding device is provided with three rows of feeding pipes along the transverse direction of the trolley through the three roller gap positions between the 1st roller and the 2nd roller, between the 2nd roller and the 3rd roller, and between the 3rd roller and the 4th roller of the nine-roller feeder. Each row has 10 - 20 pipes, and the feeding amount of each feeding pipe is adjustable.

[0021] Further, the ignition temperature in step (8) is 950 - 1050°C, the suction negative pressure is 8000 - 10500 Pa, and the ignition time is 1.5 - 2 min.

[0022] Further, the feeding amounts of the two roller gap feeding pipes between the 9th roller and the 8th roller, and between the 8th roller and the 7th roller show a gradient decreasing trend from the two side edges to the center of the trolley. The feeding amount of the first feeding pipe closest to the edge of the sintering trolley is β1, and the feeding amount of the nth feeding pipe is β n-1 -1.26, where 1 ≤ n ≤ 15, β1 ∈ [20, 30]; among them, β is the feeding amount of a single feeding pipe at the two roller gap positions between the 9th roller and the 8th roller, and between the 8th roller and the 7th roller of the nine-roller feeder, with the unit of kg / h.

[0023] Further, the feeding amounts of the three roller gap feeding pipes between the first roller and the second roller, the second roller and the third roller, and the third roller and the fourth roller show a decreasing gradient trend from the two side edges to the center of the trolley. The feeding amount of the first feeding pipe symmetric to the edge of the sintering trolley is θ1, and the feeding amount of the nth feeding pipe is θ n-1 -1.88, where 1 ≤ n ≤ 10 and θ1 ∈ [30, 60]; here, θ is the feeding amount of a single feeding pipe at the positions of the three roller gaps between the first roller and the second roller, the second roller and the third roller, and the third roller and the fourth roller of the nine-roller feeder of the feeding device, with the unit of kg / h.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1) Through the feeding device passing through the nine-roller feeder, the sintering mixture A, the low-carbon mixture B, and the high-carbon mixture C are subjected to gradient stratification and precise fixed-point and quantitative addition to the mixture on the sintering trolley, so that the waste activated carbon is efficiently and fully utilized in the longitudinal direction of sintering, achieving the reduction of sintering solid fuel consumption, enhancing the heat required for effective ore formation in the upper part and the edges of the sintering trolley, improving the quality of the sintered ore in the upper layer and the edges of the sintering trolley, and ultimately achieving the purpose of reducing the production operation cost.

[0026] 2) The low-carbon mixture B and the high-carbon mixture C use waste activated carbon powder instead of fuel and are mixed into different feeding positions, realizing the resource utilization of the waste activated carbon powder, saving the consumption of sintered fixed fuel, saving resources, and making full use of the activated carbon powder.

[0027] 3) Fully considering the combustion characteristics of the activated carbon powder, the dosage and the feeding position of the activated carbon powder are fully combined to avoid the difference in combustion rate between the activated carbon powder and the solid fuel, ensuring the high-temperature combustion time and improving the quality of the sintered ore. Specific embodiments

[0028] The following further describes the specific embodiments of the present invention:

[0029] Example 1:

[0030] Table 1 Basic parameters of the sintering machine in Example 1:

[0031] Name <![CDATA[Sintering machine area / m 2 > Carriage width / mm Bed depth / mm 265 3500 750

[0032] Table 2 Composition of the sintering mixture in Example 1 %:

[0033] Name TFe <![CDATA[SiO2]]> CaO MgO <![CDATA[Al2O3]]> C R Sinter mix A 50.73 4.32 8.49 1.66 1.36 3.99 1.96 Low-carbon mix B 51.36 4.18 8.76 1.54 1.26 2.10 2.0 High-carbon mix C 52.33 4.47 8.12 1.73 1.87 5.34 1.81

[0034] Table 3 Particle size percentage of the sintering mixture in Example 1 % by mass:

[0035]

[0036] A sintered burden layer of 20 - 30 mm is paved on the top of the sintering trolley to prevent the grate bars from being burned due to excessive sintering temperature. The sintering mixture A is normally paved on the sintered burden layer through a clay roller + nine-roller distributor. The low-carbon mixture B is evenly paved in the sintering mixture A along the transverse direction of the trolley through two roller gaps between the 9th and 8th rollers and between the 8th and 7th rollers of the nine-roller distributor by means of a feeding device. Two rows of feeding pipes are equidistantly distributed along the transverse direction of the trolley directly above the roller gaps, with 25 pipes in each row. To reduce the edge effect of the trolley, the feeding amount of the feeding pipes shows a gradient decreasing trend from the two side edges of the trolley to the center. The high-carbon mixture C is evenly paved in the sintering mixture A along the transverse direction of the trolley through three roller gaps between the 1st and 2nd rollers, between the 2nd and 3rd rollers, and between the 3rd and 4th rollers of the nine-roller distributor by means of a feeding device. Three rows of feeding pipes are equidistantly distributed along the transverse direction of the trolley directly above the roller gaps, with 20 pipes in each row. To reduce the edge effect of the trolley, the feeding amount of the feeding pipes shows a gradient decreasing trend from the two side edges of the trolley to the center.

[0037] Table 4 Feeding amount β (kg / h) of the low-carbon mixture B in Example 1:

[0038]

[0039]

[0040] Table 5 Feeding amount θ (kg / h) of the high-carbon mixture C in Example 1:

[0041] Feeding pipe 1 2 3 4 5 6 7 8 9 10 θ 60 58.12 56.24 54.36 52.48 50.6 48.72 46.84 44.96 43.08

[0042] The ignition temperature during ignition sintering is 1025.467 °C, the suction negative pressure is 90600 Pa, and the ignition time is 1.59 min.

[0043] In Example 1, the sintering utilization coefficient is increased from 1.26 t / (m2·h) to 1.36 t / (m2·h), an increase of 8 percentage points; the consumption of the sintering solid fuel coke powder is reduced from 48.95 kg / t to 45.66 kg / t, a reduction of 3.29 kg / t, a reduction of nearly 7 percentage points; the tumbler strength of the sinter is increased from 78.76% to 80.03%; the return ore rate of the sinter is reduced from 20.19% to 16.66%.

[0044] Example 2:

[0045] Table 6 Basic parameters of the sintering machine in Example 2:

[0046] Name <![CDATA[Sintering machine area / m 2 > Carriage width / mm Bed depth / mm 360 4000 800

[0047] Table 7 Composition % of the sintering mixture in Example 2:

[0048] Name TFe <![CDATA[SiO2]]> CaO MgO <![CDATA[Al2O3]]> C R Mix A 49.73 4.92 8.59 1.59 1.06 3.58 1.74 Mix B 50.38 5.18 9.46 1.50 1.21 2.12 1.82 Mix C 50.33 4.17 8.12 1.63 1.27 4.08 1.94

[0049] Table 8 Mass percentage of particle size in the sintering mixture of Example 2:

[0050]

[0051] Lay a sintering bed material layer of 20 - 30 mm on the top of the sintering pallet car to prevent the grate bars from being burned due to excessive sintering temperature; the sintering mixture A is normally laid on the sintering bed material layer through a clay roller - nine - roller feeder; the low - carbon mixture B is evenly laid along the transverse direction of the pallet car in the sintering mixture A through the cloth - feeding device through the two roller gaps between the 9th and 8th rollers and between the 8th and 7th rollers of the nine - roller feeder; two rows of feeding pipes are evenly distributed at equal intervals along the transverse direction of the pallet car directly above the roller gaps, with 20 pipes in each row. To reduce the edge effect of the pallet car, the feeding amount of the feeding pipes shows a gradient decreasing trend from the two - side edges to the center of the pallet car; the high - carbon mixture C is evenly laid along the transverse direction of the pallet car in the sintering mixture A through the cloth - feeding device through the three roller gaps between the 1st and 2nd rollers, between the 2nd and 3rd rollers, and between the 3rd and 4th rollers of the nine - roller feeder; three rows of feeding pipes are evenly distributed at equal intervals along the transverse direction of the pallet car directly above the roller gaps, with 20 pipes in each row. To reduce the edge effect of the pallet car, the feeding amount of the feeding pipes shows a gradient decreasing trend from the two - side edges to the center of the pallet car.

[0052] Table 9 Feeding amount β (kg / h) of the feeding pipes for the low - carbon mixture B in Example 2:

[0053] Feeding pipe 1 2 3 4 5 6 7 8 9 10 β 30 28.74 27.48 26.22 24.96 23.7 22.44 21.18 19.92 18.66

[0054] Table 10 Feeding amount θ (kg / h) of the feeding pipes for the high - carbon mixture C in Example 2:

[0055] Feeding pipe 1 2 3 4 5 6 7 8 9 10 θ 50 48.12 46.24 44.36 42.48 40.6 38.72 36.84 34.96 33.08

[0056] The ignition temperature during ignition sintering is 1035.7 °C, the suction negative pressure is 96600 Pa, and the ignition time is 1.89 min.

[0057] The sintering utilization coefficient of Example 2 is increased from 1.31 t / (m 2 ·h) to 1.37 t / (m 2 ·h), an increase of 4.5 percentage points; the consumption of sintered solid fuel coke powder is reduced from 49.05 kg / t to 44.16 kg / t, a reduction of 4.89 kg / t, a reduction of nearly 10 percentage points; the tumbler strength of the sinter is increased from 79.76% to 82.03%; the return ore rate of sintering is reduced from 19.19% to 15.96%.

[0058] Example 3

[0059] Table 11 Basic parameters of the sintering machine in Example 3

[0060] Name <![CDATA[Sintering machine area / m 2 > Carriage width / mm Bed depth / mm 405 5000 800

[0061] Table 12 Composition of sintered mixture in Example 3 (%)

[0062] Name TFe <![CDATA[SiO2]]> CaO MgO <![CDATA[Al2O3]]> C R Mix A 53.23 4.02 8.49 1.53 1.86 3.69 2.11 Mix B 52.64 4.38 8.76 1.55 1.96 2.88 2.0 Mix C 51.63 4.26 8.32 1.73 1.88 5.18 1.95

[0063] Table 13 Sintering mixture particle size percentage by mass in Example 3:

[0064]

[0065]

[0066] A 20-30mm sintering base material layer is laid on the top of the sintering trolley to prevent the sintering temperature from being too high and burning the grate bars; the sintering mixture A is normally laid on the sintering base material layer through the mud roller-nine roller distributor; the low-carbon mixture B is evenly laid in the sintering mixture A along the trolley through the gap between the 9th and 8th rollers, and the 8th and 7th rollers of the nine-roller distributor through the distribution device; two rows of feeding pipes are evenly distributed along the lateral direction of the trolley just above the roller gap, with 10 pipes in each row, to reduce the risk of trolley side friction. In order to reduce the edge effect of the trolley, the discharge amount of the feeding pipe tends to decrease gradually from the edges of both sides of the trolley to the center; the high carbon mixture C is evenly spread in the sintered mixture A along the transverse direction of the trolley through the three roller gaps between the 1st and 2nd rollers, the 2nd and 3rd rollers, and the 3rd and 4th rollers of the nine-roller distributor through the distribution device; three rows of feeding pipes are distributed at equal distances along the transverse direction of the trolley just above the roller gap, with 20 pipes in each row. In order to reduce the edge effect of the trolley, the discharge amount of the feeding pipe tends to decrease gradually from the edges of both sides of the trolley to the center.

[0067] Table 14: Feeding rate β (kg / h) of low carbon mixture B in Example 3:

[0068] Feeding pipe 1 2 3 4 5 β 20 18.74 17.48 16.22 14.96

[0069] Table 15: Feed rate θ (kg / h) of high carbon mixture C in Example 3:

[0070] Feeding pipe 1 2 3 4 5 6 7 8 9 10 θ 48 46.12 44.24 42.36 40.48 38.6 36.72 34.84 32.96 31.08

[0071] The ignition temperature during sintering is 1000.6°C, the exhaust negative pressure is 90800Pa, and the ignition time is 2 minutes.

[0072] Example 3 Sintering utilization coefficient is 1.21t / (m 2 h) increased to 1.33t / (m 2·h), an increase of 10 percentage points; the consumption of sintered solid fuel coke powder decreased from 54.95 kg / t to 47.68 kg / t, a decrease of 7.27 kg / t, a decrease of nearly 13 percentage points; the tumbler strength of sinter increased from 77.76% to 81.33%; the sinter return rate decreased from 19.01% to 17.76%.

[0073] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and concept of the present invention, making equivalent substitutions or changes, should be covered within the protection scope of the present invention.

Claims

1. A method for recycling sintered waste activated carbon powder, characterized in that, This method mixes waste activated carbon powder with flux and iron concentrate to prepare pellets with different carbon contents. The pellets are then added to the mixture on a sintering trolley in a gradient layered manner through the gap between the rollers of a nine-roller distributor. The pellets are then precisely and quantitatively added to the mixture. The method for recycling waste activated carbon powder from sintering includes the following: (1) adding iron ore powder, return ore, flux, and solid fuel into a mixer for mixing, and preparing and obtaining a sintering mixture A; (2) batching, mixing, granulating, and drying the waste activated carbon powder, flux, iron ore powder, and returned ore to obtain a low-carbon mixture B; (3) batching, mixing, granulating, and drying the waste activated carbon powder, flux, iron ore powder, and return ore to obtain a high-carbon mixture C; (4) Lay a sintering base material layer on the top of the sintering trolley to prevent the sintering temperature from being too high and burning the grate bars; (5) The sintering mixture A prepared in step (1) is normally paved on the sintering base material layer through a mud roller + nine-roller distributor; (6) The low-carbon mixture B prepared in step (2) is evenly spread in the sintered mixture A along the horizontal direction of the trolley through the gaps between the 9th roller and the 8th roller, and between the 8th roller and the 7th roller of the nine-roller distributor; (7) The high-carbon mixture C prepared in step (3) is evenly spread in the sintered mixture A along the horizontal direction of the trolley through the gaps between the first and second rollers, the second and third rollers, and the third and fourth rollers of the nine-roller distributor through the distribution device; (8) The sintered mixture is leveled, ignited, and then sintered to form ore.

2. The method for recycling sintered waste activated carbon powder according to claim 1, characterized in that The components of the sintering mixture A in step (1) are as follows in percentage by mass: TFe∈[49%, 54%], CaO / SiO2∈[1.7, 2.2], Al2O3∈[1.0%, 2.3%], C∈[3.5%, 4.0%], and the rest are solvents and impurities; wherein, the particle size of the sintering mixture A is less than 1 mm, accounting for less than 6% by mass, the particle size of 1-5 mm accounts for 90%-95% by mass, and the particle size ≥5 mm accounts for less than 6% by mass.

3. A method for recycling sintered waste activated carbon powder according to claim 1, characterized in that, The components of the low-carbon mixture B in the step (2) are as follows in terms of mass percentage: TFe∈[50%, 53%], CaO / SiO2∈[1.8, 2.0], Al2O3∈[1.2%, 2.0%], C∈[2.0%, 3.0%], and the rest are solvents and impurities; wherein, the particle size <1mm in the sintering mixture A accounts for less than 30% by mass, the particle size between 1 and 5mm accounts for 60% to 75% by mass, and the particle size ≥5mm accounts for less than 30% by mass.

4. A method for recycling sintered waste activated carbon powder according to claim 1, characterized in that The components in the high-carbon mixture C in step (3) are as follows by mass percentage: TFe ∈ [50%, 53%], CaO / SiO2 ∈ [1.8, 2.0], Al2O3 ∈ [1.2%, 2.0%], C ∈ [4.0%, 6.0%], and the rest are solvents and impurities; among them, the particle size <1 mm in the sintering mixture A accounts for less than 20% by mass percentage, the particle size between 1 and 5 mm accounts for 75% - 85% by mass percentage, and the particle size ≥5 mm accounts for less than 20% by mass percentage.

5. A method for recycling sintered waste activated carbon powder according to claim 1, characterized in that, In step (6), the feeding device is provided with two rows of feeding pipes along the transverse direction of the trolley through the two roll gap positions between the 9th roll and the 8th roll, and between the 8th roll and the 7th roll of the nine-roll feeder. Each row is distributed with 20 - 30 pipes, and the feeding amount of each feeding pipe can be adjusted.

6. A method for recycling sintered waste activated carbon powder according to claim 1, characterized in that, In step (7), the feeding device is provided with three rows of feeding pipes along the transverse direction of the trolley through the three roll gap positions between the 1st roll and the 2nd roll, between the 2nd roll and the 3rd roll, and between the 3rd roll and the 4th roll of the nine-roll feeder. Each row is distributed with 10 - 20 pipes, and the feeding amount of each feeding pipe can be adjusted.

7. A method for recycling sintered waste activated carbon powder according to claim 1, characterized in that, In step (8), the ignition temperature is 950 - 1050 °C, the suction negative pressure is 8000 - 10500 Pa, and the ignition time is 1.5 - 2 min.

8. A method for recycling sintered waste activated carbon powder according to claim 5, characterized in that The feeding amounts of the two roller gap feeding pipes between the 9th roller and the 8th roller, and between the 8th roller and the 7th roller show a trend of decreasing gradient from the two side edges to the center of the trolley. The feeding amount of the first feeding pipe closest to the edge of the sintering trolley is β1, and the feeding amount of the nth feeding pipe is β n-1 -1.26, where 1 ≤ n ≤ 15 and β1 ∈ [20, 30]; where β is the feeding amount of a single feeding pipe at the two roller gap positions between the 9th roller and the 8th roller, and between the 8th roller and the 7th roller of the nine-roller feeder, with the unit of kg / h.

9. A method for recycling sintered waste activated carbon powder according to claim 6, characterized in that, The feeding amounts of the three roller gap feeding pipes between the first roller and the second roller, the second roller and the third roller, and the third roller and the fourth roller show a decreasing gradient from the two side edges to the center of the trolley. The feeding amount of the first feeding pipe symmetric to the edge of the sintering trolley is θ1, and the feeding amount of the nth feeding pipe is θ n-1 -1.88, where 1 ≤ n ≤ 10 and θ1 ∈ [30, 60]; where θ is the feeding amount of a single feeding pipe at the positions of the three roller gaps between the first roller and the second roller, the second roller and the third roller, and the third roller and the fourth roller of the nine-roller feeder of the cloth-feeding device, with the unit of kg / h.

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