Method for efficiently producing coal-quality carburant by optimizing coal blending

Abstract

The invention discloses a method for efficiently producing a coal-quality carburant by optimizing coal blending, which comprises the following steps: (1) crushing bituminous coal and anthracite to a set particle size, and performing ore blending optimization and uniform mixing to obtain mixed coal; (2) distributing the mixed coal into a rotary kiln, calcining in the rotary kiln, and discharging a calcined product into a cooler to obtain a cooled calcined product; and (3) crushing and screening the cooled calcined product to obtain the carburant. Part of bituminous coal is added as a raw material, so that the bituminous coal with high volatile matter escapes more volatile matter in a kiln, and the volatile matter contains a large amount of combustible gas such as H2, CO or organic matters, so that the atmosphere in the kiln is converted from a weak oxidizing atmosphere to a weak reducing atmosphere, and the oxidation loss of carbon is effectively reduced; the carbon yield is increased; the ash content is reduced; and the product quality is improved. Meanwhile, part of bituminous coal is added, combustible volatile matter is increased, heat and temperature in the kiln can be reasonably controlled by adjusting combustion of the volatile matter, external heat sources are reduced or not needed, and the production cost is reduced. And compared with anthracite, the bituminous coal is lower in cost and higher in cost performance, so that the cost of the coal carburant is further reduced, and the economic benefit is effectively improved.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical technology, specifically relating to a method for optimizing coal blending to produce coal carbonizers efficiently. Background Technology

[0002] Carbon raisers, used in casting and steelmaking processes, increase the carbon content of molten iron or steel to meet the carbon composition and smelting requirements of specific materials. This enhances the material's hardness, strength, and wear resistance, stabilizes its chemical composition, removes impurities from the molten metal, and reduces production costs. Carbon, as one of the most important alloying elements in steel, directly affects its mechanical properties, including strength, hardness, wear resistance, and toughness. Therefore, developing high-performance, low-cost carbon raiser products and optimizing their production processes and equipment are crucial for improving production efficiency, reducing costs, and enhancing product quality in the steel industry.

[0003] Traditional recarburizing agents are diverse, including graphitized recarburizing agents, calcined petroleum coke recarburizing agents, natural graphite recarburizing agents, artificial graphite recarburizing agents, and coal-based recarburizing agents. Among them, coal-based recarburizing agents are the main recarburizing agents used in steelmaking due to their wide availability of raw materials and low cost. Currently, the main process for preparing recarburizing agents is the pot furnace method. The working principle of the pot furnace is that fuel burns in the combustion chamber, and the hot flue gas indirectly heats the raw materials through the fire channel wall. At the same time, the volatiles released during the heating process are collected through pipes and transported to the fire channel for combustion, making it a self-heating calcination device. When the volatile content of the raw materials is greater than a certain proportion, the pot furnace does not require external fuel and can utilize all the volatiles of the material for combustion and heating. Indirect heating results in slow and thorough heating of the material, and avoids contact between the high-temperature material and air, minimizing oxidation losses. However, the pot furnace has significant disadvantages. The material is heated in the pot furnace for a long time, up to 36-72 hours, resulting in limited production capacity and low production efficiency. Increasing production capacity requires increasing the number of furnaces, which occupies a large area. Furthermore, combustion control in pot furnaces largely relies on manual experience, resulting in significant fluctuations in product quality and a poor production environment.

[0004] Chinese patent (application number: 202310973620.2) discloses a coke powder recarburizer and its production method, mainly including the following steps: using the undersize material after screening the coke entering the blast furnace of a long-process steel plant as raw material; conveying the raw material to a continuous heating device and drying it until the moisture content is less than 1%; crushing the dried raw material into powder less than 3mm using a crusher to obtain the coke powder recarburizer. This patent improves the quality of coke powder so that its moisture and particle size meet the requirements of steelmaking recarburizers, thereby realizing the replacement of steelmaking recarburizers with coke powder recarburizers. This process improves the quality of coke powder so that its moisture and particle size meet the requirements of steelmaking recarburizers. However, in addition to strict requirements for moisture and particle size, high-quality recarburizers also have requirements for ash content, volatile matter, and sulfur content. This process only removes moisture from the coke powder at low temperature, resulting in a low fixed carbon content and still high volatile matter and sulfur content, which cannot meet the needs of high-end steel smelting.

[0005] Chinese patent (application number: 202010427529.7) discloses a method for preparing a carbon raiser from anthracite. The anthracite is processed through a heavy medium cyclone process to obtain clean coal. This clean coal, as a low-temperature solid material, is then sequentially processed through a pre-drying process, a drying process, and a roasting process to obtain a high-temperature solid material. After cooling, the carbon raiser product can be prepared. The roasting process employs a two-stage roasting process. The first-stage roasting has a feed temperature of 90–120℃, a discharge temperature of 320–420℃, and a roasting time of 20–50 min. The second-stage roasting has a feed temperature of 320–420℃, a discharge temperature of 750–900℃, and a roasting time of 20–40 min. The flue gas from the second-stage roasting can be burned in a burner as a heat source for the first-stage roasting and drying processes. While this process has advantages such as low energy consumption and good product quality, it also suffers from problems such as a long process flow and low efficiency (heat treatment time exceeding 2 hours). Summary of the Invention

[0006] The inventors discovered in their research that the key technical challenge in producing coal-based carbon raisers using rotary kilns lies in how to effectively control the kiln atmosphere and temperature. When producing carbon raisers using the rotary kiln method, the low volatile matter content of anthracite, coupled with the inability to completely seal the kiln head, tail, and other parts, results in a weakly oxidizing atmosphere inside the kiln. This leads to a high fixed carbon content in the product, significant carbon loss (generally exceeding 10%), poor product quality, low yield, increased ash content, and a decline in product quality. Furthermore, due to the low volatile matter content of anthracite, the combustion of volatile matter within the kiln is insufficient to generate enough heat, requiring an additional heat source for the rotary kiln, thus increasing costs.

[0007] The purpose of this invention is to provide a method for optimizing coal blending and producing coal-based carbon raisers efficiently. By adding bituminous coal to anthracite, the high volatility of bituminous coal is fully utilized, causing more combustible volatiles to volatilize from the raw material. On the one hand, this allows for the regulation of the atmosphere inside the rotary kiln, transforming it from a weakly oxidizing atmosphere when using anthracite as raw material to an inert or weakly reducing atmosphere, thereby reducing carbon oxidation, lowering carbon loss, increasing carbon yield, and improving product quality. On the other hand, due to the increased combustible volatiles, the heat and temperature inside the kiln can be rationally controlled by adjusting the combustion of volatiles, reducing or eliminating the need for external heating sources and lowering production costs.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] This invention provides a method for optimizing coal blending and efficiently producing coal-carbonizing agents, comprising the following steps:

[0010] (1) Crushing bituminous coal and anthracite to a set particle size, and then obtaining mixed coal by optimizing the ore blending and mixing;

[0011] (2) The mixed coal obtained in step (1) is fed into the rotary kiln and calcined in the rotary kiln. The calcined product is discharged to the cooler to obtain the cooled calcined product. After the mixed coal is calcined at high temperature in the rotary kiln, the volatile matter is fully discharged and the fixed carbon content is increased.

[0012] (3) The calcined material obtained in step (2) after cooling is crushed and sieved to obtain the carbon raiser.

[0013] Preferably, in step (1), the bituminous coal and anthracite are crushed using a two-stage crushing process. The first stage of crushing is coarse crushing, in which a hammer crusher is used to initially crush the bituminous coal and anthracite, and the particle size after crushing is controlled at -50mm. The coarsely crushed bituminous coal and anthracite are then passed through an impact crusher to finely crush the bituminous coal and anthracite, and the particle size is controlled at -25mm.

[0014] Preferably, in step (1), the finely crushed bituminous coal and anthracite are blended to control the "comprehensive volatile matter" of the blended coal within the range of 10-25%. If the bituminous coal ratio is too high and the "comprehensive volatile matter" exceeds 25%, it will result in a high volatile matter content in the carbon raiser, which does not meet the requirements; if it is below 10%, the atmosphere in the kiln will be mainly weakly oxidizing, leading to increased carbon loss, increased ash content, and decreased product quality.

[0015] Preferably, in step (2), the mixed coal is sent to the feed hopper of the rotary kiln via a belt conveyor and enters the self-heating rotary kiln for heating. In the rotary kiln, it goes through the preheating, heating and high-temperature calcination stages in sequence.

[0016] Preferably, in step (2), the temperature of the high-temperature section inside the rotary kiln is controlled to be 900-1050℃, the rotary kiln rotation speed is 0.5-1.5r / min, the calcination time inside the kiln is 60-120min, the rotary kiln filling rate is 10%-25%, and the pressure inside the rotary kiln is 30Pa-70Pa.

[0017] Preferably, in step (2), the calcined anthracite is unloaded into a finished product storage tank and cooled to room temperature using circulating cooling water.

[0018] Preferably, in step (3), the cooled calcined material is crushed to -10mm by a four-roll crusher to obtain the carbon raiser product.

[0019] The rotary kiln method differs fundamentally from the pot furnace method. The rotary kiln method heats the material directly. Besides a small amount of natural gas or coal gas injected into the burners, the fuel for the rotary kiln primarily relies on the volatiles released during calcination. External tuyeres provide secondary and tertiary airflow to ensure complete combustion of the volatiles within the kiln. This direct heating method results in rapid material heating, completing calcination within 0.5–1.5 hours, leading to high production capacity and efficiency. The rotary kiln boasts a simple structure, uses a single material, resulting in low construction costs per unit capacity. It is quick to build, has a long service life (typically 20–30 years), and is highly adaptable to various carbonaceous materials. Rotary kiln production of recarburizers offers advantages such as high heating efficiency, continuous production, strong adaptability, environmental friendliness, energy saving, and high product quality. It enables large-scale, high-quality production of recarburizers and will be the primary production method for recarburizers in the future.

[0020] Compared with the prior art, the advantages of the present invention are as follows:

[0021] (1) This invention provides an optimized method for producing coal-based carbon raisers using optimized coal blending. Addressing the challenges of atmosphere and temperature control, and high oxidation loss associated with rotary kiln production of coal-based carbon raisers, this method adds a portion of bituminous coal as raw material. This allows the high-volatile bituminous coal to release more volatile matter within the kiln. Since the volatile matter contains a large amount of combustible gases such as H2, CO, or organic matter, the kiln atmosphere is transformed from a weakly oxidizing atmosphere to a weakly reducing atmosphere, effectively reducing carbon oxidation loss, increasing carbon yield, reducing ash content, and improving product quality. Simultaneously, the addition of bituminous coal increases the combustible volatile matter content. By adjusting the combustion of volatile matter, the heat and temperature within the kiln can be rationally controlled, reducing or eliminating the need for external heating sources and lowering production costs. Compared to anthracite, bituminous coal is cheaper and more cost-effective, thus further reducing the cost of coal-based carbon raisers and effectively improving economic efficiency.

[0022] (2) The present invention provides a method for optimizing coal blending and producing coal quality carbonizers. The method uses the "comprehensive volatile matter" in the mixed coal as the standard for optimizing coal blending. By adjusting the ratio of bituminous coal and anthracite, the volatile matter is controlled within the range of 10-25%, and the product quality and yield can be obtained with better indicators. Using this indicator for coal blending further simplifies the coal blending process in the production process, making the process more adaptable to complex and varied raw material types, thereby improving the stability of raw materials, making the product quality more uniform, and making the production more stable.

[0023] (3) Through the optimized coal blending method of the present invention for efficient production of coal-based carbon raisers, high-performance carbon raiser products were successfully prepared in a 300,000-ton / year rotary kiln production line. No additional fuel was required for combustion heating, significantly reducing carbon loss and achieving large-scale, low-energy-consumption, automated, and high-performance carbon raiser production. Compared to anthracite, bituminous coal has lower costs and a higher cost-performance ratio, thus further reducing the cost of coal-based carbon raisers and effectively improving economic efficiency. Attached Figure Description

[0024] Figure 1 This is a process flow diagram of the present invention. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention. All materials and instruments used in the following embodiments are commercially available.

[0026] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0027] Comparative Example 1

[0028] Anthracite with a fixed carbon content of 85.26%, volatile matter of 6.80%, and ash content of 6.34% is crushed to -25mm in two stages using a hammer crusher and an impact crusher. The crushed mixed coal is then conveyed by a belt conveyor to the feed hopper of a rotary kiln and calcined inside the kiln. The calcination temperature is controlled at 1000℃, the calcination time at 70min, the rotary kiln speed at 0.5r / min, the rotary kiln filling rate at 12%, and the pressure inside the rotary kiln at 33Pa. The calcined anthracite is cooled to room temperature in a cooler. The cooled material is then further crushed to -10mm using a double roll crusher, which is the coal carbonizer.

[0029] The coal-based carbon raiser prepared in Comparative Example 1 had a fixed carbon content of 88.96%, a volatile matter content of 1.42%, an ash content of 9.83%, and a sulfur content of 0.32%; however, its carbon loss was as high as 11.78%.

[0030] Comparative Example 2

[0031] Anthracite with a fixed carbon content of 85.26%, volatile matter of 6.80%, and ash of 6.34% and anthracite with a fixed carbon content of 61.56%, volatile matter of 31.63%, and ash of 5.67% are crushed to -25mm in two stages using a hammer crusher and an impact crusher. The crushed bituminous coal and anthracite are then batched using a disc feeder and an electronic belt scale to achieve a "comprehensive volatile matter" of 26% for the mixed coal. The fully mixed coal is then conveyed by a belt conveyor to the feed hopper of a rotary kiln and calcined in the rotary kiln. The calcination temperature is controlled at 1050℃, the calcination time at 120min, the rotary kiln speed at 0.5r / min, the rotary kiln filling rate at 16%, and the pressure inside the rotary kiln at 43Pa. The calcined anthracite is cooled to room temperature in a cooler. The cooled material is then further crushed to -10mm using a double roll crusher, which is the coal carbonizer. The fixed carbon content of this coal-based carbon raiser is 88.02%, the volatile matter is 2.21%, the ash content is 7.78%, and the sulfur content is 0.32%, which does not meet the requirements of FC90 carbon raiser; the carbon loss is 6.02%.

[0032] As shown in Comparative Example 2, when the "total volatile matter" is too high (exceeding 25%), the volatile matter content in the product exceeds 2%, which does not meet the requirements for steelmaking recarburizers.

[0033] Example 1

[0034] Anthracite with a fixed carbon content of 85.26%, volatile matter of 6.80%, and ash of 6.34% and anthracite with a fixed carbon content of 61.56%, volatile matter of 31.63%, and ash of 5.67% are crushed to -25mm in two stages using a hammer crusher and an impact crusher. The crushed bituminous coal and anthracite are then batched using a disc feeder and an electronic belt scale to achieve a "comprehensive volatile matter" of 11.7% for the mixed coal. The fully mixed coal is then conveyed by a belt conveyor to the feed hopper of a rotary kiln and calcined in the rotary kiln. The calcination temperature is controlled at 1000℃, the calcination time at 70min, the rotary kiln speed at 0.5r / min, the rotary kiln filling rate at 12%, and the pressure inside the rotary kiln at 33Pa. The calcined anthracite is cooled to room temperature in a cooler. The cooled material is then further crushed to -10mm using a double roll crusher, which is the coal carbonizer.

[0035] The coal-based carbon raiser prepared in Example 1 has a fixed carbon content of 90.02%, a volatile matter content of 1.21%, an ash content of 8.74%, and an sulfur content of 0.29%, which meets the requirements of FC90 carbon raiser; the carbon loss is only 9.16%.

[0036] Comparing Example 1 and Comparative Example 1, the quality of the product was improved and the carbon loss was significantly reduced after incorporating some bituminous coal.

[0037] Example 2

[0038] Anthracite with a fixed carbon content of 85.26%, volatile matter of 6.80%, and ash of 6.34% and anthracite with a fixed carbon content of 61.56%, volatile matter of 31.63%, and ash of 5.67% are crushed to -25mm in two stages using a hammer crusher and an impact crusher. The crushed bituminous coal and anthracite are then batched using a disc feeder and an electronic belt scale to achieve a "comprehensive volatile matter" of 14.5% for the mixed coal. The fully mixed coal is then conveyed by a belt conveyor to the feed hopper of a rotary kiln and calcined in the rotary kiln. The calcination temperature is controlled at 1000℃, the calcination time at 80min, the rotary kiln speed at 0.5r / min, the rotary kiln filling rate at 14%, and the pressure inside the rotary kiln at 33Pa. The calcined anthracite is cooled to room temperature in a cooler. The cooled material is then further crushed to -10mm using a double roll crusher, which is the coal carbonizer.

[0039] The coal-based carbon raiser prepared in Example 2 has a fixed carbon content of 90.12%, a volatile matter content of 1.32%, an ash content of 8.56%, and an sulfur content of 0.28%, which meets the requirements of FC90 carbon raiser; the carbon loss is only 8.87%.

[0040] Example 3

[0041] Anthracite with a fixed carbon content of 85.26%, volatile matter of 6.80%, and ash of 6.34% and anthracite with a fixed carbon content of 61.56%, volatile matter of 31.63%, and ash of 5.67% are crushed to -25mm in two stages using a hammer crusher and an impact crusher. The crushed bituminous coal and anthracite are then batched using a disc feeder and an electronic belt scale to achieve a "comprehensive volatile matter" of 16.7% for the mixed coal. The fully mixed coal is then conveyed by a belt conveyor to the feed hopper of a rotary kiln and calcined in the rotary kiln. The calcination temperature is controlled at 1025℃, the calcination time at 90min, the rotary kiln speed at 0.5r / min, the rotary kiln filling rate at 13%, and the pressure inside the rotary kiln at 44Pa. The calcined anthracite is cooled to room temperature in a cooler. The cooled material is then further crushed to -10mm using a double roll crusher, which is the coal carbonizer.

[0042] The coal-based carbon raiser prepared in Example 3 has a fixed carbon content of 90.11%, a volatile matter content of 1.39%, an ash content of 8.54%, and an sulfur content of 0.27%, which meets the requirements of FC90 carbon raiser; the carbon loss is only 8.28%.

[0043] Example 4

[0044] Anthracite with a fixed carbon content of 85.26%, volatile matter of 6.80%, and ash of 6.34% and anthracite with a fixed carbon content of 61.56%, volatile matter of 31.63%, and ash of 5.67% are crushed to -25mm in two stages using a hammer crusher and an impact crusher. The crushed bituminous coal and anthracite are then batched using a disc feeder and an electronic belt scale to achieve a "comprehensive volatile matter" of 19.5% for the mixed coal. The fully mixed coal is then conveyed by a belt conveyor to the feed hopper of the rotary kiln and calcined in the rotary kiln. The calcination temperature in the kiln is controlled at 1030℃, the calcination time at 100min, the rotary kiln speed at 0.5r / min, the rotary kiln filling rate at 14%, and the pressure inside the rotary kiln at 42Pa. The calcined anthracite is cooled to room temperature in a cooler. The cooled material is then further crushed to -10mm using a double roll crusher, which is the coal carbonizer.

[0045] The coal-based carbon raiser prepared in Example 4 has a fixed carbon content of 90.09%, a volatile matter content of 1.42%, an ash content of 8.51%, and an sulfur content of 0.26%, which meets the requirements of FC90 carbon raiser; the carbon loss is only 7.64%.

[0046] Example 5

[0047] Anthracite with a fixed carbon content of 85.26%, volatile matter of 6.80%, and ash of 6.34% and anthracite with a fixed carbon content of 61.56%, volatile matter of 31.63%, and ash of 5.67% are crushed to -25mm in two stages using a hammer crusher and an impact crusher. The crushed bituminous coal and anthracite are then batched using a disc feeder and an electronic belt scale to achieve a "comprehensive volatile matter" of 22.8% for the mixed coal. The fully mixed coal is then conveyed by a belt conveyor to the feed hopper of a rotary kiln and calcined in the rotary kiln. The calcination temperature is controlled at 1030℃, the calcination time at 100min, the rotary kiln speed at 0.5r / min, the rotary kiln filling rate at 14%, and the pressure inside the rotary kiln at 42Pa. The calcined anthracite is cooled to room temperature in a cooler. The cooled material is then further crushed to -10mm using a double roll crusher, which is the coal carbonizer.

[0048] The coal-based carbon raiser prepared in Example 5 has a fixed carbon content of 90.02%, a volatile matter content of 1.44%, an ash content of 8.54%, and an sulfur content of 0.25%, which meets the requirements of FC90 carbon raiser; the carbon loss is only 6.78%.

[0049] Example 6

[0050] Anthracite with a fixed carbon content of 85.26%, volatile matter of 6.80%, and ash of 6.34% and anthracite with a fixed carbon content of 61.56%, volatile matter of 31.63%, and ash of 5.67% are crushed to -25mm in two stages using a hammer crusher and an impact crusher. The crushed bituminous coal and anthracite are then batched using a disc feeder and an electronic belt scale to achieve a "comprehensive volatile matter" of 25% for the mixed coal. The fully mixed coal is then conveyed by a belt conveyor to the feed hopper of a rotary kiln and calcined in the rotary kiln. The calcination temperature is controlled at 1050℃, the calcination time at 120min, the rotary kiln speed at 0.5r / min, the rotary kiln filling rate at 16%, and the pressure inside the rotary kiln at 43Pa. The calcined anthracite is cooled to room temperature in a cooler. The cooled material is then further crushed to -10mm using a double roll crusher, which is the coal carbonizer.

[0051] The coal-based carbon raiser prepared in Example 6 has a fixed carbon content of 90.04%, a volatile matter content of 1.48%, an ash content of 8.48%, and an sulfur content of 0.25%, which meets the requirements of FC90 carbon raiser; the carbon loss is only 6.02%.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention using the methods and techniques disclosed above, or modify them into equivalent embodiments with equivalent changes, without departing from the spirit and technical essence of the present invention. Therefore, any simple modifications, equivalent substitutions, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall still fall within the protection scope of the technical solutions of the present invention.

Claims

1. A method for optimizing coal blending and efficiently producing coal-grade carbon raisers, characterized in that, Includes the following steps: (1) Crushing bituminous coal and anthracite to a set particle size, and then obtaining mixed coal by optimizing the ore blending and mixing; (2) The mixed coal obtained in step (1) is fed into the rotary kiln and calcined in the rotary kiln. The calcined product is discharged to the cooler to obtain the cooled calcined product. (3) The calcined material obtained in step (2) after cooling is crushed and sieved to obtain the carbon raiser.

2. The method for optimizing coal blending and efficiently producing coal quality carbon raisers according to claim 1, characterized in that, In step (1), the bituminous coal and anthracite are crushed using a two-stage crushing process. The first stage of crushing is coarse crushing, in which a hammer crusher is used to initially crush the bituminous coal and anthracite, and the particle size after crushing is controlled at -50mm. The bituminous coal and anthracite after coarse crushing are then crushed by an impact crusher, and the particle size of the finely crushed bituminous coal and anthracite is controlled at -25mm.

3. The method for optimizing coal blending and efficiently producing coal quality carbonizer according to claim 1, characterized in that, In step (1), the finely crushed bituminous coal and anthracite are blended to control the "comprehensive volatile matter" of the blended coal within the range of 10-25%.

4. The method for optimizing coal blending and efficiently producing coal quality carbon raisers according to claim 1, characterized in that, In step (2), the mixed coal is sent to the feed hopper of the rotary kiln via a belt conveyor and enters the self-heating rotary kiln for heating. It goes through the preheating, heating and high-temperature calcination stages in the rotary kiln.

5. The method for optimizing coal blending and efficiently producing coal quality additives according to claim 4, characterized in that, In step (2), the temperature of the high-temperature section inside the rotary kiln is controlled at 900-1050℃, the rotary kiln speed is 0.5-1.5r / min, the calcination time inside the kiln is 60-120min, the rotary kiln filling rate is 10%-25%, and the pressure inside the rotary kiln is 30Pa-70Pa.

6. The method for optimizing coal blending and efficiently producing coal quality carbonizer according to claim 1, characterized in that, In step (2), the calcined anthracite is unloaded into the finished product storage tank and cooled to room temperature using circulating cooling water.

7. The method for optimizing coal blending and efficiently producing coal quality carbon raisers according to claim 1, characterized in that, In step (3), the cooled calcined material is crushed to -10mm by a four-roll crusher to obtain the carbon raiser product.

8. A coal-based carbon raiser, characterized in that, It is prepared by any one of the methods in claims 1 to 7.

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