Purifying adsorptive carbon powder pressed ball as well as preparation method and application thereof

Abstract

The invention provides a purified adsorptive carbon powder pressed ball as well as a preparation method and application thereof, and belongs to the technical field of pressed ball manufacturing. The roasting flue gas and the metallurgical coke powder are mixed, hydrogen oil and other impurities in the roasting flue gas are adsorbed through the metallurgical coke powder, the effect of purifying waste gas is achieved, the metallurgical coke powder adsorption waste adsorbing the hydrogen oil and other impurities is mixed with the binding agent and water, the dosage relation between the metallurgical coke powder adsorption waste and the binding agent is strictly controlled, and the waste gas purification effect is achieved. The purification adsorptive carbon powder pressed ball is obtained through extrusion forming, impurities such as hydrogen oil are solidified, meanwhile, metallurgical coke powder is recycled, solid waste emission is reduced, and the prepared purification adsorptive carbon powder pressed ball has good performance and can serve as a filler to be used for preparing a prebaked anode carbon bowl for aluminum electrolysis.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pressing ball manufacturing, in particular to a purified adsorptive carbon powder pressing ball and a preparation method and application thereof. BACKGROUND

[0002] In the process of baking production of the prebaked anode carbon block for aluminum electrolysis, a large amount of baking flue gas is generated, and the baking flue gas contains many impurities such as hydrogen oil, volatile components, carbon monoxide and carbon dioxide. If the baking flue gas is directly discharged into the atmosphere, it will cause serious air pollution, so the baking flue gas needs to be purified before being discharged. In the prior art, metallurgical coke powder is generally used for adsorption to remove the light tar components that are not fully combusted in the flue gas, and the metallurgical coke powder after adsorption contains a large amount of hydrogen oil components. The hydrogen oil components have a strong binding effect and are difficult to remove from the metallurgical coke powder, so the metallurgical coke powder is difficult to be reused and is often discharged in a stacked manner. This not only causes a great environmental risk, but also causes resource waste, thereby greatly increasing the production cost of the prebaked anode carbon block for aluminum electrolysis. Therefore, how to realize the secondary utilization of the metallurgical coke powder after adsorption has become a technical problem to be solved in the field. SUMMARY

[0003] The present application provides a purified adsorptive carbon powder pressing ball and a preparation method and application thereof. The purified adsorptive carbon powder pressing ball obtained by the preparation method has a regular shape, a smooth surface and good fluidity, and can be used as a filler to prepare a prebaked anode carbon bowl for aluminum electrolysis.

[0004] In order to achieve the above-mentioned application purposes, the present application provides the following technical solutions:

[0005] The present application provides a preparation method of a purified adsorptive carbon powder pressing ball, comprising the following steps:

[0006] (1) mixing the baking flue gas and the metallurgical coke powder to obtain metallurgical coke powder adsorption waste;

[0007] (2) mixing the metallurgical coke powder adsorption waste obtained in the step (1), a binder and water, and then performing extrusion molding to obtain the purified adsorptive carbon powder pressing ball;

[0008] The mass ratio of the metallurgical coke powder adsorption waste to the binder in the step (2) is (90-95):(5-10).

[0009] Preferably, the particle size of the metallurgical coke powder in the step (1) is less than 1 mm.

[0010] Preferably, the volume of the baking flue gas to the mass of the metallurgical coke powder in the step (1) is 1 m 3 :(10-20) g.

[0011] Preferably, the binder in step (2) is a biomass binder.

[0012] Preferably, the biomass binder is glutinous rice powder.

[0013] Preferably, the amount of water used in step (2) is 20-30 wt.% of the metallurgical coke powder adsorbed waste material.

[0014] Preferably, the mixing method of the metallurgical coke powder adsorbed waste material, the binder and water in step (2) is to first add the binder to the metallurgical coke powder adsorbed waste material and stir for 5-10 min, and then add water and stir for 10-15 min.

[0015] Preferably, the particle size of the purified adsorptive carbon powder briquettes in step (2) is 1-9 mm.

[0016] The present application provides the purified adsorptive carbon powder briquettes prepared by the preparation method described in the above technical solution.

[0017] The present application provides the application of the purified adsorptive carbon powder briquettes described in the above technical solution as a filler in the preparation of prebaked anode carbon bowls for aluminum electrolysis.

[0018] The present application provides a preparation method of purified adsorptive carbon powder briquettes, comprising the following steps:

[0019] (1) mixing calcined flue gas and metallurgical coke powder to obtain metallurgical coke powder adsorbed waste material; (2) mixing the metallurgical coke powder adsorbed waste material obtained in step (1), a binder and water, and then performing extrusion molding to obtain purified adsorptive carbon powder briquettes; the mass ratio of the metallurgical coke powder adsorbed waste material and the binder in step (2) is (90-95):(5-10). The present application mixes calcined flue gas and metallurgical coke powder, uses the metallurgical coke powder to adsorb impurities such as hydrogen oil in the calcined flue gas to achieve the effect of purifying waste gas, mixes the metallurgical coke powder adsorbed waste material adsorbed with impurities such as hydrogen oil with a binder and water, strictly controls the amount relationship of the metallurgical coke powder adsorbed waste material and the binder, and then performs extrusion molding to obtain purified adsorptive carbon powder briquettes, which not only solidifies impurities such as hydrogen oil, but also realizes the resource recycling of the metallurgical coke powder adsorbed waste material, reduces solid waste emissions, and the prepared purified adsorptive carbon powder briquettes have good performance and can be used as a filler to prepare prebaked anode carbon bowls for aluminum electrolysis. The results of the examples show that the purified adsorptive carbon powder briquettes prepared by the preparation method provided by the present application have regular shape, smooth surface and good fluidity, can be used as a filler to prepare prebaked anode carbon bowls for aluminum electrolysis, and realize the comprehensive utilization of the metallurgical coke powder adsorbed waste material. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1A physical map of the purified adsorptive carbon powder briquetting ball prepared for the embodiment 1 of the present application. DETAILED DESCRIPTION

[0021] The present application provides a preparation method of a purified adsorptive carbon powder briquetting ball, comprising the following steps:

[0022] (1) mixing the calcined flue gas and the metallurgical coke powder to obtain metallurgical coke powder adsorbed waste;

[0023] (2) mixing the metallurgical coke powder adsorbed waste obtained in the step (1), a binder and water, and then performing extrusion molding to obtain the purified adsorptive carbon powder briquetting ball.

[0024] In the present application, the raw materials used are all commercially available products well known to those skilled in the art, unless otherwise specified.

[0025] In the present application, the calcined flue gas and the metallurgical coke powder are mixed to obtain the metallurgical coke powder adsorbed waste.

[0026] In the present application, the calcined flue gas is preferably the calcined flue gas generated in the calcination production process of the prebaked anode carbon block for aluminum electrolysis.

[0027] In the present application, the heating rate of the calcination is 4.5-7.5℃ / h, preferably 5-7℃ / h, and more preferably 5.5-6.5℃ / h; the temperature of the calcination is 900-1050℃, preferably 1000-1050℃; and the holding time of the calcination is preferably 40-72h, and more preferably 48-60h. In the present application, the calcination is preferably performed in an environment isolated from air. By isolating air, the present application can avoid the oxidation of the carbon block with oxygen in the air. By using the calcination method, the present application can isolate air and avoid the reaction of carbon elements with oxygen in the air at high temperature during calcination. By controlling the heating rate of the calcination, the calcination material can be slowly heated to the temperature of the calcination. In this process, when the temperature reaches 300-900℃, the moisture and hydrogen oil impurities in the calcination material will gradually gasify and be removed, and the organic matter inside will also gradually decompose into carbon monoxide or carbon dioxide gas and be removed, thereby removing the impurities in the calcination material. When the temperature reaches 450-500℃, the calcination material will form semi-coke. When the temperature reaches 550-900℃, the semi-coke will be converted into agglomerated coke. By controlling the calcination time, long-term high-temperature holding can achieve carbon structure rearrangement, and the purposes of improving graphitization degree, strength, electrical conductivity and homogeneity are achieved.

[0028] In the present application, the particle size of the metallurgical coke powder is preferably <1 mm; more preferably, the proportion of the metallurgical coke powder with a particle size of less than 0.074 mm is more than 70%. In the present application, the composition of the metallurgical coke powder preferably includes, by mass percentage, fixed carbon ≥55%, ash ≤35%, S ≤4%, moisture ≤5%, and volatile matter ≤15%. The present application does not have special limitations on the specific source of the metallurgical coke powder, and any commercially available product or the pulverized metallurgical coke powder collected by the multifunctional overhead crane dust collector during the operation of the roasting furnace can be used. By controlling the composition of the metallurgical coke powder, the present application can ensure that the final pressed ball has high performance.

[0029] In the present application, the volume of the roasting flue gas and the mass of the metallurgical coke powder are preferably in a ratio of 1 m 3 : (10-20) g. According to the present application, the ratio of the roasting flue gas and the metallurgical coke powder is controlled according to the full adsorption of hydrogen oil in the roasting flue gas and the non-sticking of the dust collector bag, so that the metallurgical coke powder can fully adsorb the hydrogen oil in the roasting flue gas and not stick to the dust collector bag.

[0030] In the present application, the mixing is preferably carried out in the Venturi reactor of the black process dust removal system.

[0031] In the present application, the roasting flue gas is preferably continuously introduced into the Venturi reactor of the black process dust removal system through the annular flue and the outer flue of the purification chamber; and the metallurgical coke powder is preferably sprayed into the Venturi reactor of the black process dust removal system through a spiral and a throat pipe.

[0032] In the present application, the mixing time is preferably 10-15 min. By mixing the roasting flue gas and the metallurgical coke powder, the metallurgical coke powder can adsorb the components such as hydrogen oil in the roasting flue gas, thereby purifying the waste gas.

[0033] After obtaining the metallurgical coke powder adsorbed waste, the present application mixes the metallurgical coke powder adsorbed waste, a binder, and water, and then performs extrusion molding to obtain a purified adsorptive carbon powder pressed ball.

[0034] In the present application, the binder is preferably a biomass binder, and more preferably glutinous rice powder. The present application does not have special limitations on the particle size of the glutinous rice powder, and any glutinous rice powder known to those skilled in the art can be used. The present application uses a biomass binder, which has a wide source of raw materials, low cost, and good binding effect.

[0035] In the present application, the mass ratio of the metallurgical coke powder adsorbed waste and the binder is (90-95):(5-10), preferably (93-95):(5-7), and more preferably 93:7. By controlling the ratio of the two, the present application can not only use the binder to completely bind the raw materials into a whole, but also avoid excessive binder that can cause the performance of the pressed ball to deteriorate.

[0036] In the present application, the water is preferably process water. In the present application, the water is preferably used in an amount of 20-30 wt.% of the metallurgical coke powder adsorbed waste material, more preferably 25 wt.%. The present application uses process water to prepare the briquetted ball, which is lower in cost and does not adversely affect the performance.

[0037] In the present application, the mixing of the metallurgical coke powder adsorbed waste material, the binder and the water is preferably performed by first adding the binder to the metallurgical coke powder adsorbed waste material and stirring for 5-10 min, and then adding the water and stirring for 10-15 min. In the present application, the mixing is preferably performed in a roller mill, and the present application does not have a special limitation on the specific model of the roller mill, and a commercially available product known to those skilled in the art can be used. The present application does not have a special limitation on the stirring rate, and the stirring rate can be determined according to the technical knowledge of those skilled in the art. The present application can achieve sufficient mixing of the components by using the above mixing method.

[0038] The present application does not have a special limitation on the specific process parameters of the extrusion molding, and the process parameters can be determined according to the technical knowledge of those skilled in the art. In the present application, the extrusion molding is preferably performed in a coke granule molding machine. The present application does not have a special limitation on the specific model of the coke granule molding machine, and a commercially available product known to those skilled in the art can be used.

[0039] In the present application, the particle size of the purified adsorptive carbon powder briquetted ball is preferably 1-9 mm, more preferably 2-8 mm, and further preferably 3-7 mm.

[0040] After the extrusion molding, the present application preferably performs a drying treatment on the product of the extrusion molding to obtain a purified adsorptive carbon powder briquetted ball. In the present application, the drying treatment is preferably performed in a drying machine. The present application does not have a special limitation on the temperature and time of the drying treatment, and the temperature and time can be determined according to the technical knowledge of those skilled in the art, and the water content of the briquetted ball can be removed. The present application can further improve the performance of the briquetted ball by removing the water content through the drying treatment.

[0041] The present application can remove hydrogen oil and volatile components in the anode carbon block by baking the prebaked anode carbon block for aluminum electrolysis and controlling the baking temperature and the heating rate, and the volatile components in the carbon block can be combusted at high temperature, which can not only remove impurities in the carbon block, but also reduce energy consumption. Then, the baking flue gas and metallurgical coke powder are mixed, the hydrogen oil and other impurities in the baking flue gas are adsorbed by the metallurgical coke powder, and the effect of purifying the waste gas is achieved. The metallurgical coke powder adsorbing waste material, binder and water are mixed, and the amount of the metallurgical coke powder adsorbing waste material and the binder is strictly controlled. Then, the purified adsorptive carbon powder pressing ball is obtained by extrusion molding. The hydrogen oil and other impurities are solidified, the reuse of the metallurgical coke powder is realized, the solid waste discharge is reduced, and the purified adsorptive carbon powder pressing ball has good performance and can be used as a filler to prepare a prebaked anode carbon bowl for aluminum electrolysis. The results of the examples show that the purified adsorptive carbon powder pressing ball prepared by the preparation method has regular shape, smooth surface and good fluidity, and can be used as a filler to prepare a prebaked anode carbon bowl for aluminum electrolysis.

[0042] The present application provides a purified adsorptive carbon powder pressing ball prepared by the preparation method.

[0043] In the present application, the particle size of the purified adsorptive carbon powder pressing ball is preferably 1-9 mm, more preferably 2-8 mm, and further preferably 3-7 mm.

[0044] The present application uses the metallurgical coke powder adsorbing baking flue gas as a raw material to prepare the purified adsorptive carbon powder pressing ball, which can not only purify the waste gas, but also fix the impurities in the pressing ball, reduce the discharge of solid waste, and will not affect the performance of the pressing ball.

[0045] The present application also provides an application of the purified adsorptive carbon powder pressing ball as a filler in preparing a prebaked anode carbon bowl for aluminum electrolysis.

[0046] The present application does not have special limitations on the specific mode of the application, and the application can be performed in a manner well known to those skilled in the art.

[0047] The purified adsorptive carbon powder pressing ball provided by the present application will not affect its performance even after adsorbing hydrogen oil and other impurities and being used as a filler to prepare a prebaked anode carbon bowl for aluminum electrolysis.

[0048] The technical solutions in the present application will be described clearly and completely in combination with the examples in the present application. Obviously, the described examples are only a part of the examples of the present application, not all the examples. Based on the examples in the present application, all other examples obtained by those skilled in the art without creative labor belong to the protection scope of the present application.

[0049] Example 1

[0050] A preparation method of the purified adsorptive carbon powder briquetting ball is the following steps:

[0051] (1) The calcined flue gas is continuously introduced into the black process dust removal system venturi reactor through the annular flue and the outer flue of the purification chamber, the metallurgical coke powder is sprayed into the black process dust removal system venturi reactor through the screw and the throat, and then mixed for 10 minutes to obtain the metallurgical coke powder adsorbed waste; the components of the metallurgical coke powder are, by mass percentage: fixed carbon ≥ 55%, ash ≤ 35%, S ≤ 4%, moisture ≤ 5% and volatile matter ≤ 15%; the volume ratio of the calcined flue gas to the mass of the metallurgical coke powder is 1m 3 : 20g;

[0052] (2) The metallurgical coke powder adsorbed waste obtained in the step (1) is first added with a binder and stirred for 5 minutes, then added with water and stirred for 15 minutes, and then extrusion molding is carried out in the coke particle molding machine, and finally drying treatment is carried out to obtain the purified adsorptive carbon powder briquetting ball with a particle size of 1-9mm, realizing the resource recycling of the metallurgical coke powder adsorbed waste; the binder is glutinous rice powder, and the mass ratio of the metallurgical coke powder adsorbed waste to the binder is 93:7; the water is process water, and the amount of the water is 20wt.% of the metallurgical coke powder adsorbed waste.

[0053] The actual picture of the purified adsorptive carbon powder briquetting ball prepared in Example 1 is shown in Figure 1 . As can be seen from Figure 1 , the purified adsorptive carbon powder briquetting ball prepared by the preparation method has regular shape, smooth surface and good fluidity.

[0054] The purified adsorptive carbon powder briquetting ball prepared in Example 1 is determined by the test standard of coal, wherein the chemical components: the determination of fixed carbon, ash, moisture and volatile matter is carried out according to the provisions of GB / T 2001; the determination of S content is carried out according to the provisions of GB / T 2286, and the results are shown in Table 1:

[0055] Table 1 Component performance test results of the purified adsorptive carbon powder briquetting ball prepared in Example 1

[0056] Received basis ar Analysis basis ad Dry basis d Dry ash-free basis da f Moisture M (wt. %) - 0.25 - - Ash A (wt. %) 23.35 23.35 23.41 - Volatile matter V (wt. %) 11.77 11.77 11.80 15.41 Fixed carbon FC (wt. %) - 64.63 64.79 - S content St (wt. %) 1.35 1.35 1.35 - Hydrogen content H (wt. %) - 2.72 2.73 -

[0057] As can be seen from Table 1, the components of the purified adsorptive carbon powder briquetting ball prepared by the present application are close to those of the metallurgical coke powder.

[0058] The calorific value of the purified adsorptive carbon powder briquetting ball prepared in Example 1 was determined, and the test standards were as follows: the total moisture test standard was GB / T211-2007, the industrial analysis test standard was GB / T211-2008, the total sulfur test standard was GB / T214-2007, and the calorific value test standard was GB / T213-2008. The results are shown in Table 2.

[0059] Table 2: Calorific value determination results of the purified adsorptive carbon powder briquetting ball prepared in Example 1

[0060] Received basis ar Analysis basis ad Dry basis d Dry ash-free basis da f Bouncing barrel Qb (MJ / kg) - 23.912 - - High heating value Qgr (MJ / kg) - 23.747 23.806 - High heating value Qgr (Kcal / kg) - - 5693.13 - Low heating value Qnet (MJ / kg) 23.180 - - - Low heating value Qnet (Kcal / kg) 5536.44 - - -

[0061] As can be seen from Table 2, the purified adsorptive carbon powder briquetting ball prepared by the present application has a high calorific value and can be used as fuel, such as in coal-fired power plants.

[0062] Example 2

[0063] A preparation method of a purified adsorptive carbon powder briquetting ball includes the following steps:

[0064] (1) The calcined flue gas is continuously introduced into the black process dust removal system venturi reactor through the annular flue and the outer flue of the purification chamber, the metallurgical coke powder is injected into the black process dust removal system venturi reactor through a screw and a throat, and then mixed for 15 minutes to obtain metallurgical coke powder adsorbed waste; the composition of the metallurgical coke powder, by mass percentage, is: fixed carbon ≥ 55%, ash ≤ 35%, S ≤ 4%, moisture ≤ 5%, and volatile matter ≤ 15%; the volume of the calcined flue gas is 1m 3 : 15g;

[0065] (2) The metallurgical coke powder adsorbed waste obtained in step (1) is first added with a binder and stirred for 5 minutes, then added with water and stirred for 15 minutes, then extruded in a coke particle forming machine, and finally dried to obtain purified adsorptive carbon powder briquetting balls with a particle size of 1-9mm, realizing the resource recycling of the metallurgical coke powder adsorbed waste; the binder is glutinous rice powder, and the mass ratio of the metallurgical coke powder adsorbed waste to the binder is 93:7; the water is process water, and the amount of water used is 25wt.% of the metallurgical coke powder adsorbed waste.

[0066] Example 3

[0067] A preparation method of a purified adsorptive carbon powder briquetting ball includes the following steps:

[0068] (1) The calcined flue gas is continuously introduced into the venturi reactor of the black process dust removal system through the annular flue and the outer flue of the purification chamber, the metallurgical coke powder is injected into the venturi reactor of the black process dust removal system through a screw and a throat, and then mixed for 10 minutes to obtain metallurgical coke powder adsorbed waste; the components of the metallurgical coke powder are, by mass percentage: fixed carbon ≥ 55%, ash ≤ 35%, S ≤ 4%, moisture ≤ 5%, and volatile matter ≤ 15%; the volume ratio of the calcined flue gas to the mass of the metallurgical coke powder is 1 m 3 : 10 g;

[0069] (2) The metallurgical coke powder adsorbed waste obtained in step (1) is first added with a binder and stirred for 5 minutes, then added with water and stirred for 15 minutes, followed by extrusion molding in a coke particle molding machine, and finally dried to obtain purified adsorptive carbon powder briquettes with a particle size of 1-9 mm, achieving resource recycling of the metallurgical coke powder adsorbed waste; the binder is glutinous rice powder, and the mass ratio of the metallurgical coke powder adsorbed waste to the binder is 93:7; the water is process water, and the amount of the water is 23 wt.% of the metallurgical coke powder adsorbed waste.

[0070] Application Example 1

[0071] The purified adsorptive carbon powder briquettes prepared in Example 1 are used as filler to prepare a prebaked anode carbon bowl for aluminum electrolysis, in the following manner: calcined coke (i.e. raw material for producing a prebaked anode for aluminum electrolysis) is subjected to size classification by being sequentially crushed and sieved, and is then fed into a coarse coke bin, a medium coke bin, and a fine coke bin; the fine coke is ground by a ball mill, and the powder is captured by a bag-type dust collector and fed into a powder bin; residual coke is crushed and sieved to be classified by size and fed into a coarse residual bin and a fine residual bin; waste green block and waste paste are crushed and fed into a green fragment bin; liquid coal pitch is fed into a high tank by a pitch delivery pump; ingredients are weighed according to a green block production formula, and the coarse coke, medium coke, coarse residual, fine coke, fine residual, and powder are weighed and fed into a coke mixing screw according to a set ratio by a belt scale, and then fed into a pre-mixing screw for dry mixing, and then fed into a mixing and kneading machine through a blocking screw, and the green fragments are simultaneously fed into the mixing and kneading machine through a blocking screw according to a set ratio, and the liquid coal pitch is fed into the mixing and kneading machine through a flow scale according to a set ratio, and the material is mixed and kneaded to produce a paste with good plasticity, the paste is cooled to 150 DEG C by a strong cooling machine, and then fed into a paste belt, weighed according to a set weight, and fed into a mold box of a vibration forming machine, a carbon bowl mold is installed on a weight of the vibration forming machine, and a green body is formed by vibration forming, the upper part of the green body is pressed into a carbon bowl of a designed specification, and the shape is fixed after water cooling; the purified adsorptive carbon powder briquettes prepared in Example 1 are used as filler to fill the carbon bowl and are rammed to support and protect the carbon bowl; then the carbon bowl is loaded into a baking furnace for high-temperature heat treatment, the surface of the prebaked anode carbon block and the filler adhered to the carbon bowl are cleaned after the prebaked anode carbon block is discharged from the high-temperature baking furnace, and a prebaked anode carbon block product with high strength, good electrical conductivity, clean surface, and regular geometric shape is obtained; then a guide rod group is installed, a steel claw of the aluminum-steel guide rod group is inserted into the carbon bowl, and the carbon bowl is cast with liquid phosphorus pig iron, and the prebaked anode carbon block and the guide rod group are combined into one after cooling, and are hung as a conductive anode for use in an aluminum electrolysis cell.

[0072] The above only describes preferred embodiments of the present application, and it should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered within the protection scope of the present application.

Claims

1. A method for preparing purified adsorbent carbon powder compressed balls, comprising the following steps: (1) Mix the roasting flue gas and metallurgical coke powder to obtain metallurgical coke powder adsorbed waste; (2) Mix the metallurgical coke powder adsorption waste obtained in step (1), binder and water, and then extrude it to obtain purified adsorption carbon powder compressed balls. In step (2), the mass ratio of metallurgical coke powder adsorption waste to binder is (90-95): (5-10).

2. The preparation method according to claim 1, characterized in that, The particle size of the metallurgical coke powder in step (1) is <1mm.

3. The preparation method according to claim 1, characterized in that, In step (1), the volume ratio of the roasting flue gas to the mass ratio of the metallurgical coke powder is 1m. 3 : (10~20)g.

4. The preparation method according to claim 1, characterized in that, The binder used in step (2) is a biomass binder.

5. The preparation method according to claim 4, characterized in that, The biomass binder is glutinous rice flour.

6. The preparation method according to claim 1, characterized in that, In step (2), the amount of water used is 20-30 wt.% of the metallurgical coke powder adsorption waste.

7. The preparation method according to claim 1, characterized in that, In step (2), the mixing method of metallurgical coke adsorption waste, binder and water is as follows: first add binder to metallurgical coke adsorption waste and stir for 5 to 10 minutes, then add water and stir for 10 to 15 minutes.

8. The preparation method according to claim 1, characterized in that, The particle size of the purified adsorbent carbon powder compressed balls in step (2) is 1-9 mm.

9. The purified adsorbent carbon powder compressed balls prepared by the preparation method according to any one of claims 1 to 8.

10. The application of the purified adsorbent carbon powder compressed balls as a filler in the preparation of prebaked anode carbon bowls for aluminum electrolysis as described in claim 9.

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