A method for reducing NOx emissions from a sintering process x and a sinter mix and a method for producing the mix

Abstract

The application discloses a sintering process NO x emission reduction method, a sintering mixture and a preparation method of the sintering mixture, and belongs to the technical field of pollutant emission reduction. The application provides a sintering mixture which can be used for reducing the emission of sintering process NO x , the sintering mixture contains sintering raw materials and nickel-containing sludge, and the adding amount of the nickel-containing sludge accounts for 0.3% to 1.5% of the total mass percentage of the sintering mixture. The nickel-containing sludge is added to the sintering raw materials, and the sintering mixture is obtained through mixing and granulation, so that on one hand, the emission of nitrogen oxides in sintering flue gas can be effectively reduced without reducing the quality of sintered ore, and energy saving and emission reduction are favorable; on the other hand, the resource utilization of the nickel-containing sludge can be realized, the nickel-containing sludge is consumed in the sintering process, and the risk of direct landfill leaching is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of pollutant emission reduction, and specifically relates to a NO x An emission reduction method, a sintering mixture and a preparation method of the mixture. Background Art

[0002] Sintering flue gas treatment is a key process in the management of nitrogen oxide emissions in the steel industry. In order to reduce the emission and harm of nitrogen oxides in sintering flue gas, a series of measures need to be taken, including optimizing the combustion process, improving combustion efficiency, and reducing waste gas emissions. Therefore, with the advancement of air pollution control work, the control of nitrogen oxides has become one of the most concerned environmental issues in steel companies.

[0003] The steel industry is an important basic industry of the national economy and has made important contributions to my country's economic and social development. In 2021, my country's steel industry's crude steel output reached 1.035 billion tons, accounting for 54.02% of the world's output. However, in the process of steel metallurgical production, a large amount of solid waste is also generated. These solid wastes are large in output and complex in composition. Nickel-containing sludge is one of the main solid wastes generated in the electroplating process of steel enterprises. The conventional methods adopted by enterprises are such as stacking and landfilling, but nickel ions are difficult to degrade in the natural environment. Heavy metals are easily released slowly during the stacking and landfilling process, and the leachate will cause secondary pollution to nearby soil and water sources.

[0004] Therefore, it will be of great significance if the solid waste generated during the steel smelting process can be used for sintering flue gas treatment. Summary of the Invention

[0005] 1. Problem to be solved

[0006] The object of the present invention is to provide a sintering process NO x The emission reduction method, sintering mixture and preparation method of the mixture can achieve resource utilization of solid waste in steel enterprises and coordinated reduction of nitrogen oxides in sintering flue gas, while ensuring the quality of sintered ore.

[0007] 2. Technical solution

[0008] In order to solve the above problems, the technical solutions adopted by the present invention are as follows:

[0009] The present invention provides a method for reducing NO emissions in sintering process. x The sintering mixture contains sintering raw materials and nickel-containing sludge, and the added amount of nickel-containing sludge accounts for 0.3%-1.5% of the total mass percentage of the sintering mixture.

[0010] Aiming at the problem that the sintering flue gas in the prior art emits a lot of nitrogen oxides, which easily causes environmental pollution, the present invention creatively adds nickel-containing sludge to the sintering raw materials, and obtains a sintering mixture through mixing and granulation. On the one hand, it can effectively reduce the nitrogen oxide emissions in the sintering flue gas without reducing the quality of the sintered ore, so that the NO generated during the sintering process is reduced to 0. x Pollutants are greatly reduced, achieving energy conservation and emission reduction; on the other hand, the resource utilization of nickel-containing sludge can be realized, and the nickel-containing sludge can be consumed in the sintering process to avoid the risk of direct landfill leaching.

[0011] Specifically, the nickel element in nickel-containing sludge mainly exists in the form of NiSO4. When the temperature rises to about 900℃, NiSO4 will decompose to form NiO. The addition of Fe element is conducive to the conversion of high-valent Ni element to (II) valence state. NiO and Fe2O3 will combine to form NiFe2O4 under high temperature calcination. The presence of NiO and NiFe2O4 is conducive to the catalysis of NO x The reaction generates N2, and as the CO concentration increases during the sintering process, it will also reduce NiFe2O4 in the nickel-containing sludge to a low-valent intermediate product, which is then converted to NO x Reoxidized to NiFe2O4, catalyzing the reduction of NO by CO x reaction, thereby simultaneously inhibiting the CO and NO x In addition, due to the generation of NO x NiO has a strong positive charge, so during the catalytic process, NiO will react with NO. x Adsorption is beneficial to further promote NO x reduction reaction.

[0012] The proportion of nickel-containing sludge added to the sintering mixture has a significant impact on NOx emissions during the sintering process. The applicant has demonstrated through numerous experiments that as the amount of nickel-containing sludge increases, the NOx content continues to decrease. When the amount of nickel-containing sludge added is 0.5%, not only does the sintering production utilization coefficient and the yield and quality of sintered ore improve, but the solid fuel consumption is also the lowest, resulting in a better NOx emission reduction effect. When the amount of nickel-containing sludge added exceeds 1.5%, although it is beneficial to NOx emission reduction, it will lead to a decline in sintering yield and quality indicators.

[0013] It should be noted that the amount of nickel-containing sludge added in this application is sufficient to ensure that NO x The emission reduction effect and sintering ore quality are crucial. As the content of nickel-containing sludge increases, NO x The content of NO is continuously decreasing, but when the addition of nickel-containing sludge exceeds 1.5%, xEmission reduction is beneficial, but it will lead to a decline in sintering quality indicators. Therefore, this application controls the addition amount of nickel-containing sludge to 0.5%-1.5% of the total mass percentage of the sintering mixture, thereby achieving better NO x It not only has the effect of emission reduction, but also helps to improve the sintering production utilization coefficient and the output and quality of sintered ore.

[0014] Furthermore, the nickel-containing sludge is solid waste generated by a steel plant and is composed of the following components by mass percentage: Fe2O3: 35.34%-38.62%, NiO: 20.6%-23.02%, SO3: 35.26%-38.26%, SiO2: 4.69%-6.32%, and the rest are unavoidable impurities. The present application optimizes and controls the mass composition of the nickel-containing sludge, especially the mass ratio of Fe2O3, NiO and SO3, thereby further ensuring NO x emission reduction effect and sintering product quality.

[0015] Furthermore, the particle size of the nickel-containing sludge in the sintering mixture is ≤3mm. When the nickel-containing sludge particle size is larger than 3mm, it cannot be fully mixed with the sintering mixture, which will have an adverse effect on the sintering product quality indicators. Therefore, the present application controls the nickel-containing sludge particle size to be less than 3mm, so that it can be fully mixed with the sintering mixture, ensuring mixing uniformity, which is conducive to a more complete reaction and a better catalytic effect.

[0016] Furthermore, the moisture content of the sintering mixture is 7.3%-8.0%. The moisture mainly affects the granulation effect and the air permeability, thereby affecting the sintering product quality indicators.

[0017] Furthermore, the sintering raw materials include mixed ore, sintering powder, return ore, coke powder, quicklime, limestone and dolomite, and the mass percentage of each component in the total amount of the sintering mixture is 61.21%-64.25%, 7.62%-8.48%, 13.67%-14.82%, 2.81%-2.88%, 2.5%-5.0%, 2.1%-2.8% and 3.25%-3.75% respectively.

[0018] Furthermore, the mixed ore contains the following components in mass percentage: TFe: 50.38-52.68%, SiO2: 8.31%-8.56%, Al2O3: 3.52%-4.10%, CaO: 5.75-6.12%, MgO: 0.31-1.01%, P: 0-0.11%, S: 0-0.10%; the sintered powder contains the following components in mass percentage: TFe: 55.61%-58.42%, SiO2: 4.81%-5.31%, Al2O3: 1.91%-2.21%, CaO: 9.15-10.10%, MgO: 1.00%-2.01%, P: 0-0.20%, S: 0.21%-0.50%.

[0019] The present invention also provides a method for preparing the above-mentioned sintering mixture, wherein the components are mixed according to the mass ratio, first mixed in a strong mixer, and then pressurized with high-pressure nitrogen and sprayed with atomized water for secondary mixing and granulation to obtain the sintering mixture.

[0020] The present invention also provides a sintering process NO x The emission reduction method is to add a certain amount of nickel-containing sludge to the sintering raw materials to prepare the above-mentioned sintering mixture, and then sintering is carried out.

[0021] Furthermore, the temperature of the sintering combustion zone is controlled at 1280°C-1350°C.

[0022] To sum up, compared with the existing technology, the present invention adds a certain amount of nickel-containing sludge to the sintering raw materials, mixes the nickel-containing sludge with the sintering raw materials and then sinters, thereby not only effectively reducing the emission of nitrogen oxides during the sintering process, which is beneficial to energy conservation and emission reduction, but also can absorb the nickel-containing sludge, avoid the risk of heavy metal leaching when the nickel-containing sludge is directly landfilled, and realize the resource recycling of nickel-containing sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a graph showing the change of CO concentration in sintering flue gas over time under different nickel-containing sludge addition amounts;

[0024] Figure 2 This is a graph showing the effect of different nickel-containing sludge addition amounts on CO concentration in sintering flue gas;

[0025] Figure 3 NO in sintering flue gas at different nickel-containing sludge addition amounts x Graph of concentration changes over time;

[0026] Figure 4 Effect of different nickel-containing sludge addition amounts on NO in sintering flue gas x Effect of concentration curve. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to specific embodiments.

[0028] Example 1

[0029] A sintering process NO of this embodiment x The emission reduction method includes the following steps:

[0030] Step 1: Prepare the raw materials

[0031] (1) The raw materials are prepared according to the following mass percentages: nickel-containing sludge: 0.5%, sintering raw material 99.5%, wherein the sintering raw material is composed of the following components in mass percentages: mixed ore: 64.25%, sintering powder: 8.48%, return ore: 14.82%, powdered coke: 2.88%, quicklime: 3.22%, dolomite: 3.75%, and limestone 2.60%; the mass percentages of the components of the nickel-containing sludge in this embodiment are: Fe2O3: 35.34%, NiO: 21.1%, SO3: 37.05%, SiO2: 6.32%, and the rest are unavoidable impurities;

[0032] The sintered powder includes the following components by mass percentage: TFe: 58.42%, SiO2: 5.31%, Al2O3: 2.21%, CaO: 10.10%, MgO: 2.01%, P: 0.20%, S: 0.35%, and the rest are unavoidable impurities; the mixed ore includes the following components by mass percentage: TFe: 52.68%, SiO2: 8.56%, Al2O3: 4 .10%, CaO: 6.12%, MgO: 1.01%, P: 0.15%, S: 0.06%, and the rest are unavoidable impurities; the return ore includes the following components in percentage by mass: TFe: 52.20%, SiO2: 4.5%, Al2O3: 2.0%, CaO: 5.26, MgO: 1.12, P: less than 0.10%, S: less than 0.10%, and the rest are unavoidable impurities.

[0033] The coke powder has the following components by mass percentage: C: 84.95%, SiO2: 4.72%, Al2O3: 0.46%, CaO: 0.61%, MgO: 0.16%, and the rest are unavoidable impurities; the quicklime has the following components by mass percentage: SiO2: 2.31%, Al2O3: 0.63%, CaO: 84.61%, MgO: 0.41%, P: 0.01%, S: 0.03%, loss on burn: 0.61%, and the rest are unavoidable impurities; the dolomite has the following components by mass percentage: SiO2: 2.26%, Al2O3: 0.58%, CaO: 31.45%, MgO: 19.45%, P: 0.01%, S: 0.03%, loss on burn: 45.50%, and the rest are unavoidable impurities.

[0034] (2) The nickel-containing sludge is crushed by a jaw crusher to obtain nickel-containing sludge with a particle size of ≤3 mm.

[0035] Step 2: Sintering and granulating the mixture

[0036] Nickel-containing sludge is mixed with mixed ore, return ore, coke powder, sinter powder, quicklime, limestone and dolomite in a high-pressure mixer. After pressurization by high-pressure nitrogen, atomized water is sprayed into the mixer through a water sprayer for mixing. The mixing time is 7 minutes. After mixing, a sintering mixture is prepared, and the final moisture content of the mixture is controlled at 7.3%.

[0037] Step 3: Sintering the fabric

[0038] First, add 2kg of base material to the sintering cup grate, and directly fill the sintering cup with the mixed and granulated raw materials. The material layer height is 720mm, and the loading amount is about 40kg at a time.

[0039] Step 4: Ignition and sintering

[0040] The ignition temperature was controlled at 1100°C, the ignition time was 90 seconds, and the ignition negative pressure was 7 kPa. The sintering timer began, and the NOx concentration in the flue gas during the sintering process was monitored using an MRU flue gas analyzer. After ignition, the negative pressure was adjusted to 14 kPa for exhaust sintering. The exhaust gas temperature and negative pressure were automatically recorded by a computer. Sintering ended when the exhaust gas temperature reached its maximum value and began to decline. The recorded time t was the time for one complete sintering cycle.

[0041] At the end of sintering, the exhaust pressure is adjusted to 7kPa. When the exhaust gas temperature is cooled to 300℃, the fan is turned off and the sintered ore is poured out to obtain the finished sintered ore. The sintered ore is crushed by a crusher and then subjected to vibration screen classification and drum strength testing.

[0042] Step 5: Screening and drum test

[0043] After sintering, the sintered ore is crushed and sieved to obtain six kinds of sintered ore with different particle sizes, and the mass of each kind of sintered ore is measured. When measuring the drum strength of the sintered ore, according to the international standard ISO-3271-1975, 7.5 kg of sintered ore with particle sizes of 25-40 mm, 16-25 mm and 10-16 mm is weighed according to the mass ratio, put into the drum, and the drum is started to rotate for 200 r, then sieved, and the sieve is shaken back and forth for 20 times. The mass of the sintered ore after sieving is measured, and the drum strength is obtained by dividing the weight of the sintered ore with the required particle size by the total mass of 7.5 kg.

[0044] In this embodiment, the concentrations of NOx and CO in the flue gas during the sintering process are detected, and the detection results are shown in Table 1. After sintering, the experimental results of measuring the quality indexes of the sintered product are recorded in Table 1.

[0045] Example 2

[0046] The sintering process of this embodiment is the same as that of Example 1, except that the addition amount of nickel-containing sludge in this embodiment accounts for 1.0% of the total weight of the sintering mixture. In this embodiment, the concentrations of NOx and CO in the flue gas during the sintering process are detected, and the detection results are shown in Table 1. After sintering, the experimental results of measuring the quality indexes of the sintered product are recorded in Table 1.

[0047] Example 3

[0048] The sintering process of this embodiment is the same as that of Example 1, except that the addition amount of nickel-containing sludge in this embodiment accounts for 1.5% of the total weight of the sintering mixture. In this embodiment, the concentrations of NOx and CO in the flue gas during the sintering process are detected, and the detection results are shown in Table 1. After sintering, the experimental results of measuring the quality indexes of the sintered product are recorded in Table 1.

[0049] Comparative Example 1

[0050] The sintering process of this embodiment is the same as that of Example 1, except that the addition amount of nickel-containing sludge in this embodiment accounts for 1.0% of the total weight of the sintering mixture. In this embodiment, the concentrations of NOx and CO in the flue gas during the sintering process are detected, and the detection results are shown in Table 1. After sintering, the experimental results of measuring the quality indexes of the sintered product are recorded in Table 1.

[0051] Table 1: Concentrations of NOx and CO in the sintering process and quality indexes of the sintered product of Examples 1-3 and Comparative Example 1

[0052]

[0053] In combination with Table 1 and theFigures 1-4 It can be seen that by adding a certain amount of nickel-containing solid waste, the CO and NO in the sintering flue gas can be effectively reduced. x Content, among which: With the increase of nickel-containing solid waste content, the CO and NO in sintering flue gas x The emission reduction effect of the content is constantly increasing, and it can also effectively improve the sintering speed and utilization coefficient of the sintering material. However, when the amount of nickel-containing solid waste added exceeds 0.5%, it will have an adverse effect on the overall production and quality indicators of sintering. Therefore, the best effect is achieved when 0.5% nickel-containing sludge is added.

[0054] Example 4

[0055] The sintering process of this embodiment is the same as that of Example 1, except that the ratio of sintering raw materials is different. The ratio of sintering raw materials in this embodiment is: nickel-containing sludge: 0.3%, mixed ore: 62.61%, sintering powder: 8.25%, return ore: 14.58%, powdered coke: 2.85%, quicklime: 5%, dolomite: 3.25%, and limestone 2.8%. The moisture content of the sintering mixture is controlled at 8.0%, and the sintering zone temperature is controlled at 1350°C.

[0056] In this embodiment, the components of the nickel-containing sludge are as follows: Fe2O3: 38.62%, NiO: 20.6%, SO3: 35.26%, SiO2: 4.69%, and the rest are unavoidable impurities; the sintered powder includes the following components as follows: TFe: 55.61%, SiO2: 4.81%, Al2O3: 1.91%, CaO: 9.15%, MgO: 1.00%, P: 0.10%, S: 0.21%, and the rest are unavoidable impurities;

[0057] The mixed ore includes the following components in percentage by mass: TFe: 50.38%, SiO2: 8.31%, Al2O3: 3.52%, CaO: 5.75%, MgO: 0.31%, P: 0.17%, S: 0.10%, and the rest are unavoidable impurities; the return ore includes the following components in percentage by mass: TFe: 64.5%, SiO2: 6.0%, Al2O3: 4.0%, CaO: 10.31%, MgO: 1.81%, P: <0.10%, S: less than 0.10%, and the rest are unavoidable impurities;

[0058] The coke powder has the following component mass percentage: C: 83.45%, SiO2: 4.22%, Al2O3: 0.44%, CaO: 0.55%, MgO: 0.18%, and the rest is inevitable impurities; the quicklime has the following component mass percentage: SiO2: 2.05%, Al2O3: 0.61%, CaO: 85.27%, MgO: 0.46%, P: 0.01%, S: 0.02%, burning loss: 0.64%, and the rest is inevitable impurities; the dolomite has the following component mass percentage: SiO2: 2.22%, Al2O3: 0.63%, CaO: 32.68%, MgO: 20.15%, P: 0.02%, S: 0.02%, burning loss: 45.80%, and the rest is inevitable impurities.

[0059] The NOx concentration and CO concentration in the sintering process in the embodiment are detected, and the results show that the NOx concentration is slightly higher than that in the embodiment 1, and the overall yield index of sintering is also slightly worse than that in the embodiment 1.

[0060] Embodiment 5

[0061] The sintering process in the embodiment is the same as that in the embodiment 1, except that the sintering raw material ratio is different. The sintering raw material ratio in the embodiment is as follows: nickel-containing sludge: 0.6%, mixed ore: 64.22%, sintering powder: 7.62%, returned ore: 14.8%, powdered coke: 2.81%, quicklime: 4.6%, dolomite: 3.25%, limestone: 2.1%, and the moisture of the sintering mixture is controlled at 7.5%, and the sintering belt temperature is controlled at 1280℃.

[0062] The nickel-containing sludge in the embodiment has the following component mass percentage: Fe2O3: 35.45%, NiO: 21.02%, SO3: 38.26%, SiO2: 5.01%, and the rest is inevitable impurities; the sintering powder comprises the following components with the following mass percentage: TFe: 57.15%, SiO2: 5.07%, Al2O3: 2.03%, CaO: 9.88%, MgO: 1.92%, P: 0.12%, S: 0.25%, and the rest is inevitable impurities;

[0063] The mixed ore includes the following components with mass percentage: TFe: 51.55%, SiO2: 8.47%, Al2O3: 3.98%, CaO: 5.98%, MgO: 0.85%, P: less than 0.11%, S: less than 0.10%, and the rest is inevitable impurities; the returned ore includes the following components with mass percentage: TFe: 60.57%, SiO2: 5.2%, Al2O3: 2.9%, CaO: 7.46%, MgO: 1.65%, P: less than 0.10%, S: less than 0.10%, and the rest is inevitable impurities.

[0064] The NOx concentration and CO concentration in the sintering process flue gas in the embodiment are detected, and the results show that the NOx concentration is slightly lower than that in the embodiment, but the yield of the sinter is also slightly worse than that in the embodiment 1.

[0065] Embodiment 6

[0066] The sintering process in the embodiment is the same as that in the embodiment 1, except that the sintering raw material ratio is different. In the embodiment, the sintering raw material ratio is as follows: nickel-containing sludge: 1.3%, mixed ore: 61.21%, sintering powder: 8.48%, returned ore: 14.82%, powdered coke: 2.88%, quicklime: 5%, dolomite: 3.56%, and limestone: 2.75%. The moisture of the sintering mixture is controlled at 7.8%, and the sintering belt temperature is controlled at 1320℃.

[0067] The nickel-containing sludge in the embodiment includes the following components with mass percentage: Fe2O3: 35.35%, NiO: 23.02%, SO3: 35.45%, SiO2: 5.73%, and the rest is inevitable impurities; the sintering powder includes the following components with mass percentage: TFe: 57.15%, SiO2: 5.06%, Al2O3: 2.04%, CaO: 9.88%, MgO: 1.92%, P: 0.14%, S: 0.45%, and the rest is inevitable impurities;

[0068] The mixed ore includes the following components with mass percentage: TFe: 51.55%, SiO2: 8.47%, Al2O3: 3.98%, CaO: 5.98%, MgO: 0.85%, P: less than 0.11%, S: less than 0.10%, and the rest is inevitable impurities; the returned ore includes the following components with mass percentage: TFe: 60.57%, SiO2: 5.2%, Al2O3: 2.9%, CaO: 7.46%, MgO: 1.65%, P: less than 0.10%, S: less than 0.10%, and the rest is inevitable impurities;

[0069] The coke powder has the following components by mass percentage: C: 82.75%, SiO2: 4.10%, Al2O3: 0.52%, CaO: 0.70%, MgO: 0.14%, and the rest are unavoidable impurities; the quicklime has the following components by mass percentage: SiO2: 2.39%, Al2O3: 0.53%, CaO: 85.21%, MgO: 0.35%, P: 0.02%, S: 0.02%, loss on burn: 0.58%, and the rest are unavoidable impurities; the dolomite has the following components by mass percentage: SiO2: 2.58%, Al2O3: 0.62%, CaO: 33.10%, MgO: 17.65%, P: 0.01%, S: 0.02%, loss on burn: 48.8%, and the rest are unavoidable impurities.

[0070] The NOx concentration and CO concentration in the flue gas during the sintering process in this embodiment were detected. The results showed that the NOx concentration was significantly reduced compared with Example 1, but the yield and quality of the sintered ore also decreased.

Claims

1. A sintering mixture, characterized in that: The sintering mixture contains sintering raw materials and nickel-containing sludge, and the added amount of nickel-containing sludge accounts for 0.3%-1.5% by mass of the total amount of the sintering mixture; the nickel-containing sludge is composed of the following components in percentage by mass: Fe2O3: 35.34%-38.62%, NiO: 20.6%-23.02%, SO3: 35.26%-38.26%, SiO2: 4.69%-6.32%, and the rest are unavoidable impurities.

2. The sintering mixture according to claim 1, characterized in that: The particle size of nickel-containing sludge in the sintering mixture is ≤3mm.

3. The sintering mixture according to claim 1, characterized in that: The moisture content of the sintering mixture is 7.3%-8.0%.

4. The sintering mixture according to any one of claims 1 to 3, characterized in that: The sintering raw materials include mixed ore, sintering powder, return ore, coke powder, quicklime, limestone and dolomite, and the mass percentage of each component in the total amount of the sintering mixture is 61.21%-64.25%, 7.62%-8.48%, 13.67%-14.82%, 2.81%-2.88%, 2.5%-5.0%, 2.1%-2.8% and 3.25%-3.75% respectively.

5. The sintering mixture according to claim 4, characterized in that The mixed ore contains the following components in mass percentage: TFe: 50.38-52.68%, SiO2: 8.31%-8.56%, Al2O3: 3.52%-4.10%, CaO: 5.75-6.12%, MgO: 0.31-1.01%, P: 0-0.11%, S: 0-0.10%; the sintered powder contains the following components in mass percentage: TFe: 55.61%-58.42%, SiO2: 4.81%-5.31%, Al2O3: 1.91%-2.21%, CaO: 9.15-10.10%, MgO: 1.00%-2.01%, P: 0-0.20%, S: 0.21%-0.50%.

6. A method for preparing a sintering mixture according to any one of claims 1 to 5, characterized in that: The components are mixed according to the mass ratio, first mixed in a powerful mixer, and then pressurized by high-pressure nitrogen and sprayed with atomized water for secondary mixing and granulation to obtain a sintering mixture.

7. A sintering process NO x The emission reduction method is characterized in that A certain amount of nickel-containing sludge is added to the sintering raw materials to prepare the sintering mixture according to any one of claims 1 to 5, and then sintering is performed.

8. The sintering process according to claim 7 x The emission reduction method is characterized in that The temperature of the sintering combustion zone is controlled at 1280℃-1350℃.

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