Graphitized carburant and preparation method thereof

Abstract

The invention relates to the technical field of carburants, and particularly discloses a graphitized carburant and a preparation method thereof, the graphitized carburant comprises 30-45 parts of waste graphite electrode, 20-35 parts of coke, 25-30 parts of coal pitch, 15-20 parts of paraffin, 5-8 parts of sodium bicarbonate, and 250-400 parts of water. Paraffin is mixed in the waste graphite electrode, the coke and the coal pitch and is used for supporting combustion, so that the waste graphite electrode, the coke and the coal pitch are combusted more fully, the combustion efficiency is improved, no impurity is generated, the combustion time is saved, and the cost is reduced; the waste graphite electrode, the coal pitch and the coal pitch are subjected to impurity removal treatment, so that the impurity content is reduced, the comprehensive performance of the whole carburant can be improved, and the carburant with micropores is prepared through foaming treatment, so that the recarburization effect can be improved more conveniently in the later period.

Description

Technical Field

[0001] The invention relates to the technical field of carburizers, in particular to a graphitized carburizer and a preparation method thereof. Background Art

[0002] Graphite recarburizer refers to a carbon product whose molecular structure is changed by high temperature or other means, and arranged regularly. In this molecular arrangement, the molecular spacing of carbon is wider, which is more conducive to decomposition and nucleation in molten iron or steel. Graphite recarburizers on the market generally come from two sources: one is the waste cutting of graphite electrodes, and the other is the graphitization product of petroleum coke at 3000 degrees.

[0003] There are many kinds of raw materials for recarburizers, and the production processes are also different. It is not the case that graphite powder is pressed and formed on the market. This production method requires the addition of too much binder for molding, and the carbon content generally does not meet the requirements of high-quality recarburizers. The pressed graphite powder is in solid block form and has no porous structure, so its absorption speed and absorption rate are not as good as those of calcined and roasted recarburizers. High-quality recarburizers generally refer to recarburizers that have been graphitized. Under high temperature conditions, the arrangement of carbon atoms is in the microscopic form of graphite, so it is called graphitization. Graphitization can reduce the content of impurities in the recarburizer, increase the carbon content of the recarburizer, and reduce the sulfur content.

[0004] However, the existing graphitized recarburizers still have the following defects:

[0005] 1. The production process of graphitized recarburizer is complicated and the high temperature treatment time is long, which leads to its high cost and is more expensive than other recarburizers.

[0006] 2. Although graphitization can reduce the impurity content in the carburizer, there are still certain impurities, which may affect the carburization effect and product quality; for this purpose, a graphitized carburizer and a preparation method thereof are provided. Summary of the invention

[0007] The purpose of the present invention is to provide a graphitized carburizer and a preparation method thereof in view of the defects of the prior art, so as to solve the problems raised by the above background technology.

[0008] To achieve the above purpose, the present invention provides the following technical solution: a graphitized carbon enhancer is made from the following raw materials in parts by weight: 30-45 parts of waste graphite electrode, 20-35 parts of coke, 25-30 parts of coal tar, 15-20 parts of paraffin, 5-8 parts of sodium bicarbonate, and 250-400 parts of water.

[0009] As a preferred technical solution of the present invention, the waste graphite electrode is processed into powder with a size of 0.8-1.2 mm.

[0010] As a preferred technical solution of the present invention, the coke is processed into powder with a size of 0.5-0.6 mm.

[0011] As a preferred technical solution of the present invention, the coal tar pitch is processed into powder with a size of 0.074-0.1 mm.

[0012] As a preferred technical solution of the present invention, the paraffin wax is in granular form with a size between 10 and 20 microns.

[0013] A method for preparing a graphitized carbon enhancer, the specific steps are as follows:

[0014] Step 1: impurity removal of waste graphite electrodes;

[0015] Step 2: impurity removal of coke;

[0016] Step 3: impurity removal of coal tar pitch;

[0017] Step 4: Graphitization treatment: the waste graphite electrode after impurity removal, coke, coal tar pitch and paraffin are mixed together through a stirring and mixing device, and then graphitized in a high-temperature electric furnace at a temperature of 2000-2500°C for 1-1.5 hours. The carbon structure in the raw material is rearranged and gradually converted into a graphite crystal structure.

[0018] Step 5: Cooling and crushing: The graphitized material needs to be cooled, and then crushed and ground to obtain a granular product;

[0019] Step 6: Screening: Screening the granular product in step 5 through a sieve to obtain mixed particles with a size of 1-2 mm;

[0020] Step 7: Foaming treatment; put the mixture particles obtained in step 6 into a kettle and add water, stir for 10-15 minutes, then add sodium bicarbonate and stir for 15-30 minutes, and heat to 350 to 400 degrees Celsius to obtain a mixture;

[0021] Step 8: The mixture obtained in step 7 is pressed into a green body by a ball press. The green body has a particle size of 1-2 cm and a length of 2-3 cm. The green body is then dried at 150-200 degrees Celsius for 1-1.5 hours. The finished product is obtained after the green body is cooled to room temperature.

[0022] As a preferred technical solution of the present invention, step 1: impurity removal of waste graphite electrodes; the specific steps are as follows:

[0023] Step 1.1: Water washing: put the waste graphite electrode powder into water to make a slurry, stir and soak it, then filter and wash it;

[0024] Step 1.2: Flotation: The filter cake after water immersion is subjected to flotation, and the carbon powder containing a small amount of fluoride is obtained by flotation foam filtration;

[0025] Step 1.3: Pickling: Soak and stir the carbon powder obtained in step 1.2 with sulfuric acid to remove the white solid copper sulfate particles therein;

[0026] Step 1.4: The carbon powder obtained by acid washing in step 1.3 is placed in a KOH solution to generate a potassium silicate precipitate, and then the potassium silicate precipitate is filtered to obtain a pure waste graphite electrode.

[0027] As a preferred technical solution of the present invention, step 2: impurity removal of coke; the specific steps are as follows:

[0028] Step 2.1: Put the coke particles into heavy oil, stir it to make the coal with low density float out and the coke with high density sink, and obtain the sunken coke;

[0029] Step 2.2: Add quicklime to the coke that has settled in step 2.1 to remove phosphorus and sulfur, convert the phosphorus and sulfur into phosphate and sulfate, and then remove the phosphate and sulfate to obtain pure coke.

[0030] As a preferred technical solution of the present invention, step 3: impurity removal of coal tar pitch; the specific steps are as follows:

[0031] Step 3.1: Magnetic separation of coal tar to remove metal impurities;

[0032] Step 3.2: Using the difference in boiling points of different substances, the impurities in the coal tar pitch after magnetic separation are separated by distillation or fractionation;

[0033] Step 3.3: Then add a modifier and a stabilizer to the coal tar pitch obtained in step 3.2, and mix to obtain pure coal tar pitch.

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention mixes paraffin with waste graphite electrodes, coke and coal tar, and uses it to assist combustion, so that the waste graphite electrodes, coke and coal tar burn more fully, improve combustion efficiency, and do not produce impurities, save combustion time, and reduce costs; the waste graphite electrodes, coal tar and coal tar are also treated to remove impurities to reduce the impurity content, and the comprehensive performance of the entire recarburizer is improved. The recarburizer with micropores prepared by foaming treatment is more convenient for improving the recarburization effect in the later stage. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present invention are described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0036] Embodiment 1: The present invention provides a technical solution: a graphitized carbon enhancer is made of the following raw materials in parts by weight: 30 parts of waste graphite electrode, 20 parts of coke, 25 parts of coal tar, 15 parts of paraffin, 5 parts of sodium bicarbonate, and 250 parts of water.

[0037] The waste graphite electrode is processed into powder with a size of 0.8 mm; the coke is processed into powder with a size of 0.5 mm; the coal tar is processed into powder with a size of 0.074 mm; and the paraffin is in granular form with a size of 10 microns.

[0038] A method for preparing a graphitized carbon enhancer, the specific steps are as follows:

[0039] Step 1: impurity removal of waste graphite electrodes;

[0040] Step 1.1: Water washing: put the waste graphite electrode powder into water to make a slurry, stir and soak it, then filter and wash it;

[0041] Step 1.2: Flotation: The filter cake after water immersion is subjected to flotation, and the carbon powder containing a small amount of fluoride is obtained by flotation foam filtration;

[0042] Step 1.3: Pickling: Soak and stir the carbon powder obtained in step 1.2 with sulfuric acid to remove the white solid copper sulfate particles therein;

[0043] Step 1.4: putting the carbon powder obtained by acid washing in step 1.3 into a KOH solution to generate potassium silicate precipitate, and then filtering the potassium silicate precipitate to obtain a pure waste graphite electrode;

[0044] Step 2: impurity removal of coke;

[0045] Step 2.1: Put the coke particles into heavy oil, stir it to make the coal with low density float out and the coke with high density sink, and obtain the sunken coke;

[0046] Step 2.2: adding quicklime to the coke that has settled in step 2.1 to remove phosphorus and sulfur, converting the phosphorus and sulfur into phosphate and sulfate, and then removing the phosphate and sulfate to obtain pure coke;

[0047] Step 3: impurity removal of coal tar pitch;

[0048] Step 3.1: Magnetic separation of coal tar to remove metal impurities;

[0049] Step 3.2: Using the difference in boiling points of different substances, the impurities in the coal tar pitch after magnetic separation are separated by distillation or fractionation;

[0050] Step 3.3: Then, add a modifier and a stabilizer to the coal tar pitch obtained in step 3.2, and mix to obtain pure coal tar pitch;

[0051] Step 4: Graphitization treatment: the waste graphite electrode after impurity removal, coke, coal tar pitch and paraffin are mixed together through a stirring and mixing device, and then graphitized in a high-temperature electric furnace at a temperature of 2000-2500°C for 1-1.5 hours. The carbon structure in the raw material is rearranged and gradually converted into a graphite crystal structure.

[0052] Step 5: Cooling and crushing: The graphitized material needs to be cooled, and then crushed and ground to obtain a granular product;

[0053] Step 6: Screening: Screening the granular product in step 5 through a sieve to obtain mixed particles with a size of 1-2 mm;

[0054] Step 7: Foaming treatment; put the mixture particles obtained in step 6 into a kettle and add water, stir for 10-15 minutes, then add sodium bicarbonate and stir for 15-30 minutes, and heat to 350 to 400 degrees Celsius to obtain a mixture;

[0055] Step 8: The mixture obtained in step 7 is pressed into a green body by a ball press. The green body has a particle size of 1-2 cm and a length of 2-3 cm. The green body is then dried at 150-200 degrees Celsius for 1-1.5 hours. The finished product is obtained after the green body is cooled to room temperature.

[0056] Embodiment 2: The present invention provides a technical solution: a graphitized carbon enhancer, which is made of the following raw materials in parts by weight: 40 parts of waste graphite electrode, 30 parts of coke, 28 parts of coal tar, 17 parts of paraffin, 6 parts of sodium bicarbonate, and 300 parts of water.

[0057] The waste graphite electrode is processed into powder with a size of 1 mm; the coke is processed into powder with a size of 0.6 mm; the coal tar is processed into powder with a size of 0.09 mm; and the paraffin is in granular form with a size of 15 microns.

[0058] A method for preparing a graphitized carbon enhancer, the specific steps are as follows:

[0059] Step 1: impurity removal of waste graphite electrodes;

[0060] Step 1.1: Water washing: put the waste graphite electrode powder into water to make a slurry, stir and soak it, then filter and wash it;

[0061] Step 1.2: Flotation: The filter cake after water immersion is subjected to flotation, and the carbon powder containing a small amount of fluoride is obtained by flotation foam filtration;

[0062] Step 1.3: Pickling: Soak and stir the carbon powder obtained in step 1.2 with sulfuric acid to remove the white solid copper sulfate particles therein;

[0063] Step 1.4: putting the carbon powder obtained by acid washing in step 1.3 into a KOH solution to generate potassium silicate precipitate, and then filtering the potassium silicate precipitate to obtain a pure waste graphite electrode;

[0064] Step 2: impurity removal of coke;

[0065] Step 2.1: Put the coke particles into heavy oil, stir it to make the coal with low density float out and the coke with high density sink, and obtain the sunken coke;

[0066] Step 2.2: adding quicklime to the coke that has settled in step 2.1 to remove phosphorus and sulfur, converting the phosphorus and sulfur into phosphate and sulfate, and then removing the phosphate and sulfate to obtain pure coke;

[0067] Step 3: impurity removal of coal tar pitch;

[0068] Step 3.1: Magnetic separation of coal tar to remove metal impurities;

[0069] Step 3.2: Using the difference in boiling points of different substances, the impurities in the coal tar pitch after magnetic separation are separated by distillation or fractionation;

[0070] Step 3.3: Then, add a modifier and a stabilizer to the coal tar pitch obtained in step 3.2, and mix to obtain pure coal tar pitch;

[0071] Step 4: Graphitization treatment: the waste graphite electrode after impurity removal, coke, coal tar pitch and paraffin are mixed together through a stirring and mixing device, and then graphitized in a high-temperature electric furnace at a temperature of 2000-2500°C for 1-1.5 hours. The carbon structure in the raw material is rearranged and gradually converted into a graphite crystal structure.

[0072] Step 5: Cooling and crushing: The graphitized material needs to be cooled, and then crushed and ground to obtain a granular product;

[0073] Step 6: Screening: Screening the granular product in step 5 through a sieve to obtain mixed particles with a size of 1-2 mm;

[0074] Step 7: Foaming treatment; put the mixture particles obtained in step 6 into a kettle and add water, stir for 10-15 minutes, then add sodium bicarbonate and stir for 15-30 minutes, and heat to 350 to 400 degrees Celsius to obtain a mixture;

[0075] Step 8: The mixture obtained in step 7 is pressed into a green body by a ball press. The green body has a particle size of 1-2 cm and a length of 2-3 cm. The green body is then dried at 150-200 degrees Celsius for 1-1.5 hours. The finished product is obtained after the green body is cooled to room temperature.

[0076] Embodiment 3: The present invention provides a technical solution: a graphitized carbon enhancer, which is made of the following raw materials in parts by weight: 45 parts of waste graphite electrode, 35 parts of coke, 30 parts of coal tar, 20 parts of paraffin, 8 parts of sodium bicarbonate, and 400 parts of water.

[0077] Waste graphite electrodes are processed into powder with a size of 1.2mm; coke is processed into powder with a size of 0.6mm; coal tar is processed into powder with a size of 0.1mm; paraffin is granular with a size of 20 microns.

[0078] A method for preparing a graphitized carbon enhancer, the specific steps are as follows:

[0079] Step 1: impurity removal of waste graphite electrodes;

[0080] Step 1.1: Water washing: put the waste graphite electrode powder into water to make a slurry, stir and soak it, then filter and wash it;

[0081] Step 1.2: Flotation: The filter cake after water immersion is subjected to flotation, and the carbon powder containing a small amount of fluoride is obtained by flotation foam filtration;

[0082] Step 1.3: Pickling: Soak and stir the carbon powder obtained in step 1.2 with sulfuric acid to remove the white solid copper sulfate particles therein;

[0083] Step 1.4: putting the carbon powder obtained by acid washing in step 1.3 into a KOH solution to generate potassium silicate precipitate, and then filtering the potassium silicate precipitate to obtain a pure waste graphite electrode;

[0084] Step 2: impurity removal of coke;

[0085] Step 2.1: Put the coke particles into heavy oil, stir it to make the coal with low density float out and the coke with high density sink, and obtain the sunken coke;

[0086] Step 2.2: adding quicklime to the coke that has settled in step 2.1 to remove phosphorus and sulfur, converting the phosphorus and sulfur into phosphate and sulfate, and then removing the phosphate and sulfate to obtain pure coke;

[0087] Step 3: impurity removal of coal tar pitch;

[0088] Step 3.1: Magnetic separation of coal tar to remove metal impurities;

[0089] Step 3.2: Using the difference in boiling points of different substances, the impurities in the coal tar pitch after magnetic separation are separated by distillation or fractionation;

[0090] Step 3.3: Then, add a modifier and a stabilizer to the coal tar pitch obtained in step 3.2, and mix to obtain pure coal tar pitch;

[0091] Step 4: Graphitization treatment: the waste graphite electrode after impurity removal, coke, coal tar pitch and paraffin are mixed together through a stirring and mixing device, and then graphitized in a high-temperature electric furnace at a temperature of 2000-2500°C for 1-1.5 hours. The carbon structure in the raw material is rearranged and gradually converted into a graphite crystal structure.

[0092] Step 5: Cooling and crushing: The graphitized material needs to be cooled, and then crushed and ground to obtain a granular product;

[0093] Step 6: Screening: Screening the granular product in step 5 through a sieve to obtain mixed particles with a size of 1-2 mm;

[0094] Step 7: Foaming treatment; put the mixture particles obtained in step 6 into a kettle and add water, stir for 10-15 minutes, then add sodium bicarbonate and stir for 15-30 minutes, and heat to 350 to 400 degrees Celsius to obtain a mixture;

[0095] Step 8: The mixture obtained in step 7 is pressed into a green body by a ball press. The green body has a particle size of 1-2 cm and a length of 2-3 cm. The green body is then dried at 150-200 degrees Celsius for 1-1.5 hours. The finished product is obtained after the green body is cooled to room temperature.

[0096] The comparative example is a conventional graphitized carburizer purchased on the market;

[0097] Carbon content% Impurities% Example 1 99.3 0.7 Example 2 99.6 0.4 Example 3 99.1 0.9 Comparative Example 97.9 2.1

[0098] In summary, the graphitized recarburizer obtained by the formula and process of the present invention has a high carbon content and few impurities.

[0099] The above embodiments only express the implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims

1. A graphitized carburizer, characterized in that: The invention is prepared from the following raw materials in parts by weight: 30-45 parts of waste graphite electrode, 20-35 parts of coke, 25-30 parts of coal tar, 15-20 parts of paraffin, 5-8 parts of sodium bicarbonate and 250-400 parts of water.

2. The graphitized recarburizer according to claim 1, characterized in that: The waste graphite electrode is processed into powder with a size of 0.8-1.2 mm.

3. The graphitized recarburizer according to claim 2, characterized in that: The coke is processed into powder with a size of 0.5-0.6 mm.

4. The graphitized recarburizer according to claim 3, characterized in that: The coal tar pitch is processed into powder with a size of 0.074-0.1 mm.

5. The graphitized recarburizer according to claim 4, characterized in that: The paraffin wax is in granular form with a size between 10 and 20 microns.

6. A method for preparing a graphitized recarburizer according to any one of claims 1 to 5, characterized in that: The specific steps are as follows: Step 1: impurity removal of waste graphite electrodes; Step 2: impurity removal of coke; Step 3: impurity removal of coal tar pitch; Step 4: Graphitization treatment: the waste graphite electrode after impurity removal, coke, coal tar pitch and paraffin are mixed together through a stirring and mixing device, and then graphitized in a high-temperature electric furnace at a temperature of 2000-2500°C for 1-1.5 hours. The carbon structure in the raw material is rearranged and gradually converted into a graphite crystal structure. Step 5: Cooling and crushing: The graphitized material needs to be cooled, and then crushed and ground to obtain a granular product; Step 6: Screening: Screening the granular product in step 5 through a sieve to obtain mixed particles with a size of 1-2 mm; Step 7: Foaming treatment; put the mixture particles obtained in step 6 into a kettle and add water, stir for 10-15 minutes, then add sodium bicarbonate and stir for 15-30 minutes, and heat to 350 to 400 degrees Celsius to obtain a mixture; Step 8: The mixture obtained in step 7 is pressed into a green body by a ball press. The green body has a particle size of 1-2 cm and a length of 2-3 cm. The green body is then dried at 150-200 degrees Celsius for 1-1.5 hours. The finished product is obtained after the green body is cooled to room temperature.

7. The method for preparing a graphitized recarburizer according to claim 6, characterized in that: Step 1: Impurity removal of waste graphite electrodes; the specific steps are as follows: Step 1.1: Water washing: put the waste graphite electrode powder into water to make a slurry, stir and soak it, then filter and wash it; Step 1.2: Flotation: The filter cake after water immersion is subjected to flotation, and the carbon powder containing a small amount of fluoride is obtained by flotation foam filtration; Step 1.3: Pickling: Soak and stir the carbon powder obtained in step 1.2 with sulfuric acid to remove the white solid copper sulfate particles therein; Step 1.4: The carbon powder obtained by acid washing in step 1.3 is placed in a KOH solution to generate a potassium silicate precipitate, and then the potassium silicate precipitate is filtered to obtain a pure waste graphite electrode.

8. The method for preparing a graphitized recarburizer according to claim 6, characterized in that: Step 2: impurity removal of coke; the specific steps are as follows: Step 2.1: Put the coke particles into heavy oil, stir it to make the coal with low density float out and the coke with high density sink, and obtain the sunken coke; Step 2.2: Add quicklime to the coke that has settled in step 2.1 to remove phosphorus and sulfur, convert the phosphorus and sulfur into phosphate and sulfate, and then remove the phosphate and sulfate to obtain pure coke.

9. The method for preparing a graphitized recarburizer according to claim 6, characterized in that: Step 3: The specific steps of impurity removal of coal tar are as follows: Step 3.1: Magnetic separation of coal tar to remove metal impurities; Step 3.2: Using the difference in boiling points of different substances, the impurities in the coal tar pitch after magnetic separation are separated by distillation or fractionation; Step 3.3: Then add a modifier and a stabilizer to the coal tar pitch obtained in step 3.2, and mix to obtain pure coal tar pitch.