KR20220156968A - Manufacturing method of load for carbon-iron composite furnace - Google Patents

Abstract

Step 1: drying iron ore powder to reduce moisture content; Step 2: Sifting the dried iron ore powder and using the small iron ore powder as a raw material; Step 3: Forming a mixed material by uniformly mixing the pulverized mixed coal and small iron ore powder; Step 4: loading the mixed material into a plurality of coal loading carts and performing compression, and then evenly applying a layer of coke powder to the surface of the mixed material after loading and pressing the mixed material; covering each coal loading cart with a lid; Step 5: moving the coal loading cart fully loaded with the mixed material into a microwave tunnel kiln, and dynamically heating the mixed material; and step 6: when the heating of the mixed material is completed and the mixed material leaves the microwave tunnel kiln, the mixed material is directly poured into a material tank and cooled to obtain a carbon-iron composite furnace load. is a manufacturing method of In the present invention, by mixing iron ore powder with mixed coal for blast furnace production to manufacture a high-reactivity carbon-iron composite furnace load having excellent quality and performance, it is possible to increase production yield and reduce emission and material consumption in the blast furnace.

Description

Manufacturing method of load for carbon-iron composite furnace

The present invention relates to a method of manufacturing a furnace load, and more particularly to a method of manufacturing a carbon-iron composite composite furnace load.

The blast furnace-converter process is a major process in steel production, and CO ₂ emissions and energy consumption in blast furnace steelmaking account for more than 80% and more than 70% of the total process, respectively. In a situation where environmental problems such as global warming become increasingly serious, steel companies will be under enormous pressure to reduce carbon emissions in the long term as CO2 emissions from the steel industry account for more than 15% _{of total} CO2 emissions. At the same time, China's annual iron-making capacity is more than 800 million tons, which places higher requirements on coke, an essential raw material for iron-making. As a lot of coking coal resources required for coke production are consumed, coking coal resources, particularly high-quality coking coal resources, are gradually depleted.

Studies have shown that iron and alkali metal compounds have a positive catalytic effect on the coke gasification reaction, which can promote CO production in the blast furnace to promote the reaction between coke and ore in the blast furnace and act as a raw material for refining highly reactive coke. According to the principle of the Rist operation line (the Rist operation line is a steady-state model established from a thermochemical point of view, and is based on the mass balance and heat balance in the high temperature region throughout the blast furnace), the highly reactive coke is It is possible to reduce the coke ratio and the production cost of the blast furnace by lowering the temperature of the heat reserve zone of the blast furnace and improving the reduction efficiency of the furnace shaft, the utilization rate of coal gas, and the reduction degree of ore.

At present, all methods of manufacturing ferro-coke in the prior art are achieved by hot pressing. The hot press process not only consumes a large amount of energy, but also has demanding control requirements and is difficult to operate. The production process is long and entails problems such as environmental pollution. After hot pressing, ferro-coke is carbonized in a shaft furnace, which can be divided into internal heating carbonization and external heating carbonization. External heating carbonization has low efficiency and low production capacity due to indirect heat transfer, while internal heating carbonization causes material loss due to direct contact between gas and material, which may reduce material strength. In addition, it is difficult to control the atmosphere in the furnace during the heating process of the material.

An object of the present invention is to provide a method for manufacturing a load for a carbon-iron composite furnace. By mixing iron ore powder and mixed coal for blast furnace production, a highly reactive carbon-iron composite furnace with excellent quality and performance can be manufactured to increase production yield and reduce blast furnace emissions and material consumption.

The invention is embodied as follows:

A method for manufacturing a carbon-iron composite furnace burden comprising the following steps:

Step 1: Drying the iron ore powder to reduce the moisture content;

Step 2: sieving the dried iron ore powder and using the undersized iron ore powder as a raw material;

Step 3: forming a blended material by uniformly mixing blended coal and small-size iron ore powder;

Step 4: loading the mixed material into a plurality of coal loading carts and performing compression, and then evenly applying a layer of coke powder to the surface of the mixed material after loading and pressing the mixed material; covering each coal loading cart with a lid;

Step 5: moving the coal loading cart loaded with the mixed material to a microwave tunnel kiln, and dynamically heating the mixed material by microwaves while moving the coal loading cart; and

Step 6: When the heating of the mixed material is completed and the mixed material leaves the microwave tunnel kiln, the mixed material is directly poured into the material tank and cooled to obtain a carbon-iron composite furnace load.

In step 1, the iron ore powder contains 0.4-0.5% CaO, 61-66% TFe, 0.4-0.5% MgO and 4-5% SiO ₂ in mass percentage.

TFe includes iron mainly supplied from Fe ₂ O ₃ and Fe ₃ O ₄ and iron supplied from other iron compounds or impurities. By adjusting the TFe content to 61-66%, it is possible to secure load strength and high reactivity in the manufactured carbon-iron composite.

In step 1, the moisture content of the dried iron ore powder is less than 0.8% by mass, and reducing the moisture content of the iron ore powder can effectively prevent the iron ore powder from caking, thereby facilitating the sieving of the iron ore powder. .

In step 2, the small iron ore powder has a particle size of less than 0.12 mm and large large particles are removed to promote uniform dispersion of the iron ore powder in the mixed coal to ensure the particle size and reactivity of the carbon-iron composite furnace load.

In step 3, the mixed material includes 12 to 28% of the iron ore powder and 72 to 88% of the mixed coal in terms of mass%. High reactivity of the material can be ensured by selecting an appropriate amount of iron ore powder and mixed coal.

Step 3 further includes crushing the mixed coal to obtain pulverized mixed coal, wherein the particle size of the mixed coal before crushing is less than 5 mm and the particle size of the crushed mixed coal is less than 3 mm, so that the reaction and mixing It is more advantageous for fusion of coal and iron ore powder. The mixed coal has a content of volatile substance VM _d of 18 to 21 mass% and an ash A _d content of 7 to 9 mass%; The mixed coal has a fat coal ratio of 15 to 20% by mass to ensure complete caking of the carbon-iron composite furnace load and to ensure that the carbon-iron composite furnace load has a desired strength.

In addition, the mixed coal may include gas coal, retention coal, caking coal, lean coal, and the like.

After compression in step 4, the mixed material has a bulk density of 800-1000 kg/m ³ to ensure complete reaction between the yield of the carbon-iron furnace load and the material to prepare the carbon-iron furnace load. do.

The coal loading cart loaded with the mixed material in step 5 is a coal loading cart fully loaded with the mixed material.

In step 5, the coal loading cart loaded with mixed materials slides into the microwave tunnel kiln.

In step 5, the microwave tunnel kiln includes a temperature increasing section and a temperature holding section; The microwave power of the microwave tunnel kiln is 6000-6250 kw and the frequency is 915 MHz; The mixed material on the coal loading cart is heated to 700-780 °C at a heating rate of 3-5 °C/min in the heating section, then heated to 1000 °C at a heating rate of 7 °C/min, and heated at 1000 °C in the temperature holding section. The temperature is maintained for 2-3 hours. By controlling the dynamic heating process, a carbon-iron composite furnace load with good quality and good grain size can be obtained.

In step 4, the top of each coal loading cart is equipped with a suction device to suck in the dust generated in the compression step to avoid air pollution.

In step 5, the top of each coal loading cart is equipped with a suction device for sucking in the gas produced from the pyrolysis of the coal in the mixed material.

Loads with carbon-iron composites have compressive strengths of 3270-3340 N, reactive CRIs of 39-44% and post-reaction strength CSRs of 12-23%.

Preferably, the carbon-iron composite loaded has a compressive strength of 3283-3329 N, a reactive CRI of 39.0-43.4%, and a post-reactive strength CSR of 12.4-22.0%.

The compressive strength of carbon-iron composite furnace load is determined according to GB/T14201-2018 standard, and the reactive CRI and reactive strength CSR of carbon-iron composite furnace load are determined according to GB/T4000 -2017 standard.

Compared with the prior art, the present invention has the following advantageous effects:

1. In the present invention, the problem of iron ore powder that can only be used for sintering or pelletization is solved by mixing dried and sieved iron ore powder with mixed coal and transferring the mixed raw material to a microwave tunnel kiln by a coal loading cart for microwave carbonization treatment. Solve it. On the other hand, by omitting the complicated hot briquetting process required for the production of conventional ferro-coke, effectively mitigating the shortage of coking coal due to the huge steel production capacity requiring a large amount of coke consumption, and a new process and utilization method of iron ore powder At the same time, it suggests a new utilization method of low-metamorphic coking coal.

2. The method of the present invention makes full use of iron and its oxides in iron ore, efficiently uses low-denaturation caking coal or weak caking coal, and adds a certain amount of holding coal to achieve complete fusion between iron ore powder and coal materials. and caking to ensure the strength of the load in the manufactured carbon-iron composite furnace.

3. The present invention uses a microwave tunnel kiln to perform dynamic heating on mixed materials to realize continuous batch production with high practicality, as well as to reduce material strength due to contact of oxidizing gas reacting with materials during internal heating carbonization with a shaft. It effectively prevents the problem of pulverized material due to mutual extrusion and friction caused by the continuous movement of material during carbonization in the shaft furnace and the problem of difficult material discharge due to sticking substances, thereby improving the yield and quality of the finished product. improve

4. The carbon-iron composite furnace load produced by the method of the present invention has excellent quality and performance and is suitable for application in blast furnace production, which improves the reduction efficiency of the furnace shaft and promotes mass production of CO in the coking process It can further reduce the consumption of coking coal, effectively reducing the CO ₂ emissions of the steelmaking process and the cost of the coking process and blast furnace production process, improving environmental and economic benefits.

5. In the present invention, the pyrolysis gas can be collected during heating of the material to improve the utilization rate of coal gas.

In the present invention, a high-reactivity carbon-iron composite furnace having excellent quality and performance can be manufactured by mixing iron ore powder and mixed coal by using the characteristic of iron ore powder having a high oxide content. The use of highly reactive carbon-iron composite furnace loads in blast furnace production can increase the yield of molten iron in the blast furnace, while reducing CO2 emissions during coking and steelmaking, _and further reducing production costs, thereby reducing the consumption cost of coking coal resources. Thus, this method has excellent environmental and economic advantages.

1 is a flowchart of a method for manufacturing a load in a carbon-iron composite furnace according to the present invention.

The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

Referring to FIG. 1 , the manufacturing method of the carbon-iron composite furnace load includes the following steps:

Step 1: Drying the iron ore powder in the production plant to reduce the moisture content, wherein the iron ore powder contains, by mass percentage, 0.4-0.5% CaO, 61-66% TFe (TFe is mainly composed of Fe ₂ O ₃ and Fe ₃ contains iron supplied from O ₄ and not excluding other iron compounds or impurities), 0.4-0.5% MgO and 4-5% SiO ₂ .

A drying method for reducing the moisture content includes putting the iron ore powder in a drying oven and subjecting the iron ore powder to ventilation drying treatment.

Step 2: Sifting the dried iron ore powder, taking a certain amount of the dried iron ore powder and sieving it through a round hole sieve, removing large and large particles using small iron ore powder with a particle size of less than 0.12 mm as a raw material By doing so, it helps to uniformly disperse the iron ore powder in the mixed coal and guarantees the quality of the load of the carbon-iron composite furnace.

Step 3: The mixed coal supplied from the production plant is crushed and uniformly mixed with small-sized iron ore powder to form a mixed material. The mixed material contains 12-28% of iron ore powder and 72-88% of mixed coal in mass percentage.

Mixed coal can be crushed by a crusher to a particle size of less than 5 mm. The particle size of the pulverized mixed coal is less than 3 mm. The volatile matter (VM _d ) content of the mixed coal is 18-21%, and the ash A _d content of the mixed coal is 7-9%. The proportion of the retained coal in the mixed coal is 15 to 20% by mass, and the type and ratio of the coal are not limited for the remainder of the mixed coal.

Step 4: Loading step of the mixed material, the completely crushed and mixed mixed material is loaded into a plurality of coal loading carts, and then the mixed material is compressed, where the bulk density of the mixed material is 800-1000 kg/m ³ by partial compaction. is adjusted to After loading and pressing, a layer of coke powder spreads evenly on the surface of the mixed material to separate the material from the air, effectively avoiding the problem of reducing material strength caused by the reaction between air and material, and finally, each coal loading cart Covered with a lid for heating.

Step 5: Carbonizing the mixed material in the coal loading cart, wherein the coal loading cart fully loaded with the mixed material slides into the microwave tunnel kiln on the track, and the mixed material is immersed in the microwave tunnel kiln during sliding of the coal loading cart. , where the microwave tunnel kiln has a microwave power of 6000-6250 kw and a frequency of 915 MHz. The daily output can reach 30 tons.

The microwave tunnel kiln includes a heating section from the kiln entrance to the center of the kiln and a temperature maintaining section from the center of the kiln to the kiln exit. Preferably, the mixed material in the coal loading cart is heated from room temperature to 700-780 °C at a heating rate of 3-5 °C/min in the heating section and then heated to 1000 °C at a heating rate of 7 °C/min in the temperature holding section. And, the temperature is preferably maintained at 1000 ° C. for 2-3 hours. The heating rate of the mixed material can be controlled by adjusting the microwave heating density of the microwave tunnel kiln in the heating section and the temperature maintaining section, so that the forward motion of the coal loading cart of the mixed material (i.e., toward the exit of the microwave tunnel kiln) achieves dynamic heating. It can be realized.

At the top of each coal loading cart, a suction device for inhaling gas generated by thermal decomposition of coal in the mixed material is provided, and the inhaled thermal decomposition gas can be used for other purposes through a gas treatment process in advance. It can produce about 173.4-209.3 m ³ of pyrolysis gas per ton of mixed material, effectively improving the gas utilization rate.

Step 6: When the heating of the mixed material is completed and the mixed material leaves the microwave tunnel kiln, the mixed material is directly poured into the material tank, and nitrogen gas is introduced to cool the material tank to obtain the carbon-iron composite furnace load, at which time the nitrogen gas is It can be recycled after heat exchange and cooling.

The quality of the carbon-iron composite furnace load produced by the method of the present invention is tested, the compressive strength of the carbon-iron composite furnace load can reach 3270-3340 N, and the reactive CRI of the carbon-iron composite furnace load is 39 -44%, and the post-reaction strength CSR of carbon-iron composite furnace load can reach 12-23%.

The compressive strength of carbon-iron composite furnace load is determined according to GB/T14201-2018 standard, and the reactive CRI and reactive strength CSR of carbon-iron composite furnace load are determined according to GB/T4000 -2017 standard.

Example 1:

The iron ore powder used in this example contains, by mass percentage: CaO 0.4%, TFe 61%, MgO 0.4%, SiO ₂ 4%. The iron ore powder in the production plant was dried until the moisture content of the dried iron ore powder was less than 0.8%. The dried iron ore powder was sieved through a round hole sieve, and small iron ore powder having a particle size of less than 0.12 mm was used as a raw material.

Mixed coal having a particle size of less than 5 mm supplied from the production plant (ash A _d = 9%, volatile substance VM _d content = 18%) was put into a crusher for mechanical crushing, and at this time, the crushed mixed coal had a particle size of is less than 3 mm. The ratio of retaining coal in mixed coal was 20%. The small iron ore powder was mechanically stirred and uniformly mixed together with the pulverized mixed coal to form a mixed material, in which the amount of iron ore powder was 12% by mass and the amount of mixed coal was 88% by mass. After the mixed material is loaded into the coal loading cart, the mixed material is compressed to adjust the bulk density of the mixed material to 1000 kg/m ³ , then a layer of coke powder is applied to the surface of the mixed material, and each coal loading cart finally covered with a lid

The coal loading cart was moved to a microwave tunnel kiln track with a microwave power of 6000 kilowatts and a frequency of 915 MHz (30 t/day output). The mixed material is dynamically heated, and the mixed material is heated from room temperature to 780 ° C in the heating section by adjusting the heating rate of the mixed material to 3 ° C / min, and then the microwave heating density is increased at a heating rate of 7 ° C / min. It is controlled and heated in the temperature maintaining section. After the temperature of the mixed material reached 1000°C, the temperature was kept constant at 1000°C for 3 hours. After exiting the furnace, the mixed material was poured into a material tank for nitrogen gas cooling. During the heating process of the mixed material, about 173.4 m ³ /t of pyrolysis gas was generated, and the pyrolysis gas could be collected by a suction device and then treated for other purposes through a gas treatment process.

The quality of the load was tested with the cooled carbon-iron composite. The test results were 3329 N in compressive strength, 39% in reactive CRI, and 22% in post-reaction strength CSR.

Example 2:

The iron ore powder used in this example contains, by mass percentage: CaO 0.45%, TFe 63%, MgO 0.45%, SiO ₂ 5%. The iron ore powder in the production plant was dried until the moisture content of the dried iron ore powder was less than 0.8%. The dried iron ore powder was sieved through a round hole sieve, and small iron ore powder having a particle size of less than 0.12 mm was used as a raw material.

Mixed coal having a particle size of less than 5 mm supplied from the production plant (ash A _d = 8%, volatile substance VM _d content = 19%) was put into a crusher for mechanical crushing, and at this time, the crushed mixed coal had a particle size of is less than 3 mm. The ratio of retaining coal in mixed coal was 18%. The small iron ore powder was mechanically stirred and uniformly mixed with the pulverized mixed coal to form a mixed material, the amount of iron ore powder was 18% by mass and the amount of mixed coal was 82% by mass. After the mixed material is loaded into the coal loading cart, the mixed material is compressed to adjust the bulk density of the mixed material to 900 kg/m ³ , then a layer of coke powder is applied to the surface of the mixed material, and each coal loading cart finally covered with a lid

The coal loading cart was moved to a microwave tunnel kiln track with a microwave power of 6000 kilowatts and a frequency of 915 MHz (30 t/day output). The mixed material is dynamically heated, and the mixed material is heated from room temperature to 750 ° C in the heating section by adjusting the heating rate of the mixed material to 4 ° C / min, and then the microwave heating density is increased at a heating rate of 7 ° C / min. It is controlled and heated in the temperature maintaining section. After the temperature of the mixed material reached 1000°C, the temperature was kept constant at 1000°C for 2.5 hours. After exiting the furnace, the mixed material was poured into a material tank for nitrogen gas cooling. During the heating process of the mixed material, about 185 m ³ /t of pyrolysis gas was generated, and the pyrolysis gas could be collected by a suction device and then treated for other purposes through a gas treatment process.

The quality of the load was tested with the cooled carbon-iron composite. The test results were 3307 N in compressive strength, 40.5% reactive CRI, and 19.3% post reactive strength CSR.

Example 3:

The iron ore powder used in this example contains, by mass percentage: CaO 0.5%, TFe 65%, MgO 0.5%, SiO ₂ 5%. The iron ore powder in the production plant was dried until the moisture content of the dried iron ore powder was less than 0.8%. The dried iron ore powder was sieved through a round hole sieve, and small iron ore powder having a particle size of less than 0.12 mm was used as a raw material.

Mixed coal having a particle size of less than 5 mm supplied from the production plant (ash A _d = 7%, volatile substance VM _d content = 20%) was put into a crusher for mechanical crushing, and at this time, the crushed mixed coal had a particle size is less than 3 mm. The proportion of retaining coal in mixed coal was 16%. The small iron ore powder was mechanically stirred and uniformly mixed with the pulverized mixed coal to form a mixed material, the amount of iron ore powder was 24% by mass and the amount of mixed coal was 76% by mass. After loading the mixed material into the coal loading cart, press the mixed material to adjust the bulk density of the mixed material to 850 kg/m ³ , then apply a layer of coke powder on the surface of the mixed material, and each coal loading cart finally covered with a lid

The coal loading cart was moved to a microwave tunnel kiln track with a microwave power of 6000 kilowatts and a frequency of 915 MHz (30 t/day output). The mixed material is dynamically heated, but the mixed material is heated from room temperature to 720 ° C in the heating section by adjusting the heating rate of the mixed material to 5 ° C / min, and then the microwave heating density is increased at a heating rate of 7 ° C / min. It is controlled and heated in the temperature maintaining section. After the temperature of the mixed material reached 1000°C, the temperature was kept constant at 1000°C for 2 hours. After exiting the furnace, the mixed material was poured into a material tank for nitrogen gas cooling. During the heating process of the mixed material, about 192.2 m ³ /t of pyrolysis gas was generated, and the pyrolysis gas could be collected by a suction device and then treated for other purposes through a gas treatment process.

The quality of the load was tested with the cooled carbon-iron composite. The test results were 3299 N in compressive strength, 41.7% reactive CRI, and 15.6% post reactive strength CSR.

Example 4:

The iron ore powder used in this example contains, by mass percentage: CaO 0.5%, TFe 66%, MgO 0.5%, SiO ₂ 5%. The iron ore powder in the production plant was dried until the moisture content of the dried iron ore powder was less than 0.8%. The dried iron ore powder was sieved through a round hole sieve, and small iron ore powder having a particle size of less than 0.12 mm was used as a raw material.

Mixed coal having a particle size of less than 5 mm supplied from the production plant (ash A _d = 8%, volatile substance VM _d content = 21%) was put into a crusher for mechanical crushing, and at this time, the crushed mixed coal had a particle size is less than 3 mm. The ratio of retaining coal in mixed coal was 15%. The small iron ore powder was mechanically stirred and uniformly mixed with the pulverized mixed coal to form a mixed material, the amount of iron ore powder was 28% by mass and the amount of mixed coal was 72% by mass. After the mixed material is loaded into the coal loading cart, the mixed material is compressed to adjust the bulk density of the mixed material to 800 kg/m ³ , then a layer of coke powder is applied to the surface of the mixed material, and each coal loading cart finally covered with a lid

The coal loading cart was moved to a microwave tunnel kiln track with a microwave power of 6000 kilowatts and a frequency of 915 MHz (30 t/day output). The mixed material is dynamically heated, and the mixed material is heated from room temperature to 700 ° C in the heating section by adjusting the heating rate of the mixed material to 5 ° C / min, and then the microwave heating density is increased at a heating rate of 7 ° C / min. It is controlled and heated in the temperature maintaining section. After the temperature of the mixed material reached 1000°C, the temperature was kept constant at 1000°C for 2 hours. After exiting the furnace, the mixed material was poured into a material tank for nitrogen gas cooling. During the heating process of the mixed material, about 209.3 m ³ /t of pyrolysis gas was generated, and the pyrolysis gas can be collected by a suction device and then treated for other purposes through a gas treatment process.

The quality of the load was tested with the cooled carbon-iron composite. The test results were compressive strength of 3283 N, reactive CRI of 43.4%, and post-reactive strength of CSR of 12.4%.

The above description is only a preferred example of the present invention, which is not intended to limit the protection scope of the present invention. Therefore, all modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should all be included in the protection scope of the present invention.

Claims (10)

A method for manufacturing a carbon-iron composite furnace burden comprising the following steps:
Step 1: Drying the iron ore powder to reduce the moisture content;
Step 2: sieving the dried iron ore powder and using the undersized iron ore powder as a raw material;
Step 3: forming a blended material by uniformly mixing blended coal and small-size iron ore powder;
Step 4: loading the mixed material into a plurality of coal loading carts and performing compression, and then evenly applying a layer of coke powder to the surface of the mixed material after loading and pressing the mixed material; covering each coal loading cart with a lid;
Step 5: moving the coal loading cart loaded with the mixed material to a microwave tunnel kiln, and dynamically heating the mixed material by microwaves while moving the coal loading cart; and
Step 6: When the heating of the mixed material is completed and the mixed material leaves the microwave tunnel kiln, the mixed material is directly poured into the material tank and cooled to obtain a carbon-iron composite furnace load.
The method according to claim 1, wherein in step 1, the iron ore powder contains 0.4-0.5% of CaO, 61-66% of TFe, 0.4-0.5% of MgO and 4-5% of SiO ₂ in terms of mass percentage. Manufacturing method of steel composite furnace loads.
The method of claim 1, wherein the iron ore powder dried in step 1 has a water content of less than 0.8% by mass.
The method of claim 1, wherein the particle size of the small-sized iron ore powder in step 2 is less than 0.12 mm.
The method of claim 1, wherein the mixed material in the step 3 includes 12 to 28% of the iron ore powder and 72 to 88% of the mixed coal in terms of mass%.
The method according to claim 1, wherein in step 3, the particle size of the mixed coal before crushing is less than 5 mm and the particle size of the crushed mixed coal is less than 3 mm; The mixed coal has a content of volatile substance VM _d of 18 to 21 mass% and an ash A _d content of 7 to 9 mass%; A method for producing a load in a carbon-iron composite furnace, characterized in that the mixed coal has a fat coal ratio of 15 to 20% by mass.
The method of claim 1, wherein the compressed mixed material has a bulk density of 800 to 1000 kg/m ³ in step 4.
The method according to claim 1, wherein in the step 5, the microwave tunnel kiln includes a temperature increasing section and a temperature holding section; The microwave power of the microwave tunnel kiln is 6000-6250 kw and the frequency is 915 MHz; The mixed material on the coal loading cart is heated to 700-780 °C at a heating rate of 3-5 °C/min in the heating section, then heated to 1000 °C at a heating rate of 7 °C/min, and heated at 1000 °C in the temperature holding section. A method for producing a load in a carbon-iron composite furnace, characterized in that the temperature is maintained for 2-3 hours.
The carbon-iron composite furnace according to claim 1, wherein in step 5, a suction device for inhaling gas generated from thermal decomposition of coal in the mixed material is provided at the top of each coal loading cart. Way.
The method of claim 1, wherein the carbon-iron composite furnace load has a compressive strength of 3270-3340 N, a reactive CRI of 39-44% and a post-reaction strength CSR of 12-23%. A method of manufacturing a load for a carbon-iron composite furnace.

Images