CN113637510A - Production method of high-value formed coke from waste coke powder - Google Patents

Production method of high-value formed coke from waste coke powder Download PDF

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CN113637510A
CN113637510A CN202010344622.1A CN202010344622A CN113637510A CN 113637510 A CN113637510 A CN 113637510A CN 202010344622 A CN202010344622 A CN 202010344622A CN 113637510 A CN113637510 A CN 113637510A
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coke
coal
coke powder
waste
powder
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CN113637510B (en
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王玉明
胡德生
钱晖
徐万仁
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L5/00—Solid fuels
    • C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
    • C10L5/06—Methods of shaping, e.g. pelletizing or briquetting
    • C10L5/10—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders
    • C10L5/14—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders with organic binders
    • C10L5/16—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders with organic binders with bituminous binders, e.g. tar, pitch
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
    • C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
    • C10B57/06—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition containing additives

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  • General Life Sciences & Earth Sciences (AREA)
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  • Coke Industry (AREA)

Abstract

The invention discloses a production method of high-value formed coke of waste coke powder, which comprises the following steps of 1: crushing waste coke powder with 12-13% of ash, 1-1.5% of volatile matter and 86-87% of fixed carbon; step 2: mixing and crushing fat coal and 1/3 coking coal; 45-60% of coke powder and blended coal, 15-25% of fat coal and 25-30% of 1/3 coke coal; and step 3: mixing the coke powder, the blended coal and the binder, wherein the weight of the binder is 5-7% of that of the blended materials; and 4, step 4: pressing the material into balls with the size of 15 x 20 mm; and 5: carbonizing material balls: raising the temperature to 1k ℃ at the speed of 6-8 ℃/min and keeping the temperature for 30 minutes; step 6: discharging the material, performing heat exchange and cooling to obtain a formed coke product, and recycling heat exchange gas to the carbonization furnace. The formed coke product is prepared by mixing and molding the waste coke powder and the blended coal and carbonizing the mixture, and can replace part of coke for a blast furnace, so that the waste coke powder is utilized with high value, and materials and energy consumption are saved.

Description

Production method of high-value formed coke from waste coke powder
Technical Field
The invention relates to a method for utilizing waste coke powder, in particular to a method for producing high-value formed coke by using waste coke powder.
Background
The iron-making process mainly utilizes coke and sinter to carry out reduction reaction to obtain molten iron, the corresponding coke capacity for providing iron-making raw materials is rapidly expanded along with the expansion of the iron-making capacity, and a plurality of iron and steel enterprises can carry out full-load or even overload production on coke ovens for producing more coke. However, with the improvement of the requirements of governments in various places on the environment-friendly production of steel enterprises, various coal-limiting measures are taken, so that the steel enterprises can only balance coke gaps caused by coal limitation by purchasing coke.
Taking a certain large-scale iron and steel enterprise as an example, the iron and steel enterprise needs to purchase more than 100 million tons of coke every year, the coke can produce a large amount of coke powder in the processes of loading, unloading, transportation, production and the like, the coke accounts for about 10% of the coke, namely more than 10 million tons of waste coke powder are produced every year, most of the waste coke powder is recycled for coking, the waste of raw materials is caused when the waste coke powder is used as raw fuel in a sintering plant, and further the production cost is improved. The other application of the waste coke powder is formed coke production, but most of the produced products are foundry coke which can only be used for the production of cupola furnaces, and the utilization value is low.
The Chinese patent application CN200510107212.0 discloses a synthetic coke and a manufacturing method thereof, wherein the synthetic coke comprises 300 parts of coke powder 150-. The synthetic coke is added with the components such as aluminum hydroxide, kaolin, bauxite and the like, and the asphalt content is higher, so that the subsequent coke carbonization is not facilitated, the quality of formed coke products is reduced, and the utilization rate of coke powder is lower when the blast furnace coke is replaced for coking.
The Chinese patent application CN201910942493.3 discloses a method for preparing high-strength coke for iron making by using chemical wastes, which comprises the steps of crushing and grinding coke powder, coal powder and a binder, then pressurizing and granulating, and spraying tar on the surface to enable the coke powder to be adhered to the surface of the material. The method has the following defects: 1. the sulfur content of the coke powder is about 8% in the actual production process, and the method has great limitation on the sulfur content of the coke powder, so that the method has great limitation on the coke powder and is not beneficial to blast furnace slagging production. 2. The specific gravity of the fat coal and the 1/3 coking coal used in the method is low, and the volatile components of coal types such as gas coal, lean coal and the like are very high, so that the finished product has more cracks, and the quality and the yield of the finished product are influenced. 3. The method needs pressurized granulation, tar spraying, coke powder sticking, high-temperature dry distillation and matching with a graphite crucible or nitrogen protection, finally produces the first-grade standard blast furnace coke which is used as a framework and a reducing agent for the blast furnace, has complex flow and is not beneficial to large-scale production, and the uniformity of the tar and the coke powder on the surface of the material is difficult to ensure, so that the rate of finished products has great uncertainty.
Disclosure of Invention
The invention aims to provide a method for producing high-value formed coke by using waste coke powder.
The invention is realized by the following steps:
a production method of high-value formed coke of waste coke powder comprises the following steps:
step 1: crushing waste coke powder, wherein in the coke powder, the ash content is 12-13%, the volatile matter content is 1-1.5%, the fixed carbon content is 86-87%, and the weight of the coke powder accounts for 45-60% of the total weight of the coke powder and the blending coal;
step 2: stirring, mixing and crushing the single coal according to a proportion to prepare blended coal; the single coal comprises fat coal and 1/3 coking coal, wherein the weight of the fat coal accounts for 15-25% of the total weight of the coke powder and the blended coal, and the weight of the 1/3 coking coal accounts for 25-30% of the total weight of the coke powder and the blended coal;
and step 3: adding the pulverized coke in the step 1 into the pulverized coal mixture in the step 2 to form a mixture, adding a binder into the mixture, wherein the weight of the binder is 5-7% of that of the mixture, and stirring and mixing the mixture with the binder;
and 4, step 4: carrying out double-roller ball pressing on the stirred and mixed material in the step 3, wherein the size of the material balls is 15 x 20 mm;
and 5: adding the material balls prepared in the step 4 into a carbonization furnace for carbonization; the heating method of carbonization comprises the following steps: heating from normal temperature to 1000 ℃ at a heating speed of 6-8 ℃/min, and keeping the temperature at 1000 ℃ for 30 min;
step 6: discharging the material carbonized in the step 5 out of the furnace, performing heat exchange cooling through gas to obtain a formed coke product, and treating the gas after heat exchange and recycling the gas to the carbonization furnace for heating.
In the step 1, the crushing particle size of the coke powder is less than 1 mm.
In said step 2, the ash content A of the fat coald8-10% of volatile component VMd15-25%; ash content A of said 1/3 coking coald6.5-7.5% of volatile component VMdIs 33-35%.
In the step 2, the granularity of single coal is less than 6mm, and the proportion of coal with the granularity of less than 1mm in the mixed and crushed blended coal is 90-95%.
In the step 3, the binder is solid medium temperature asphalt or solid high temperature asphalt, wherein the softening point of the high temperature asphalt is 125-135 ℃, and the softening point of the medium temperature asphalt is 80-90 ℃.
In the step 3, the mixing method of the coke powder, the blending coal and the binder is solid mixing.
In step 6, the formed coke product has a coke reactivity CRI of 37-39% and a coke post-reaction intensity CSR of 44-46%.
Compared with the prior art, the invention has the following beneficial effects:
1. the formed coke product is prepared by mixing and molding the waste coke powder and the blended coal and carbonizing, the coke reactivity CRI of the formed coke product can reach 37-39%, and the strength CSR of the coke after reaction can reach 44-46%, so that the formed coke product can replace part of coke for a blast furnace, the coke using amount of the blast furnace is effectively reduced, the equivalent utilization of the waste coke powder and the coke is realized, and the problem of low-value utilization that the coke powder can only be applied to sintered fuel or blast furnace injection in the prior art is solved.
2. According to the invention, the formed coke product is cooled by gas, and the waste heat after heat exchange is recycled and used for heating the carbonization furnace, so that internal circulation of the gas is realized, and the production energy consumption and cost are reduced.
3. The invention reduces the consumption of fuel and energy in the iron-making process, makes up the problem of coke shortage caused by coal limit requirements, and also meets the requirements of green and environment-friendly production.
In conclusion, the formed coke product is prepared by mixing, molding and carbonizing the waste coke powder and the blended coal, the coke reactivity CRI of the formed coke product can reach 37-39%, and the strength CSR of the coke after reaction can reach 44-46%, so that the formed coke product can replace part of coke for the blast furnace, the equivalent utilization of the waste coke powder and the coke is realized, the quantity of the coke used by the blast furnace and the energy consumption in the production process are saved, the production cost of blast furnace iron making is reduced, and the problem of partial coke gaps caused by the coal limitation problem is solved.
Drawings
FIG. 1 is a flow chart of the process for producing high value formed coke from waste coke breeze according to the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, a method for producing high-value formed coke from waste coke powder includes the following steps:
step 1: waste coke powder produced in the processes of coke loading, unloading, transporting, producing and the like purchased from manufacturers is crushed by a crusher, the ash content in the coke powder is 12-13%, the volatile component is 1-1.5%, the fixed carbon is 86-87%, and the sulfur content of the coke powder is not limited, so that the production method has good adaptability, universality and practicability, is favorable for the matching of the coke powder and coal powder, is favorable for blast furnace slagging production in the production process, and has the weight accounting for 45-60% of the total weight of the coke powder and the matched coal.
The fixed carbon content is an important influence factor for preparing the coke, the yield of pressed products is directly influenced, meanwhile, as the prepared formed coke product is directly applied to blast furnace ironmaking, the higher the fixed carbon content is, the better the fixed carbon content is, if the fixed carbon content is low, the reduction efficiency of the formed coke product to ores in the blast furnace can be influenced, the heat productivity of the formed coke product in the blast furnace can also be influenced, and the coke ratio of the blast furnace and the production cost are improved. Therefore, the invention controls the content of the fixed carbon to be 86-87%, ensures the yield of the compression molding, enables the produced formed coke product to have good calorific value in the blast furnace and effectively reduces the ore, and enables the waste coke powder to achieve the equivalent utilization of the coke.
The crushing granularity of the coke powder is less than 1mm, so that the coke powder, the coal powder and the asphalt can be mixed, the mixing uniformity is improved, and the local aggregation phenomenon is avoided.
Step 2: adding single coal purchased from manufacturers into a crusher according to a certain proportion, stirring, mixing and crushing to prepare blended coal; the single coal comprises fat coal and 1/3 coking coal, wherein the weight of the fat coal accounts for 15-25% of the total weight of the coke powder and the blended coal, and the weight of the 1/3 coking coal accounts for 25-30% of the total weight of the coke powder and the blended coal.
Ash content A of said fat coald8-10% of volatile component VMd15-25%; ash content A of said 1/3 coking coald6.5-7.5% of volatile component VMd33-35 percent, is beneficial to the melting and carbonization reaction of the prepared raw material product in the heating process, ensures that the product reaches certain strength, and can be quickly gasified in a blast furnace.
The invention considers the best proportion of fat coal and 1/3 coking coal, ensures that the fat coal and 1/3 coking coal react with coke powder and binder and are fused into coke after forming a colloid under a certain temperature condition, and only uses the fat coal and 1/3 coking coal, the fat coal is taken as the produced base coal and can generate a large amount of colloids under the heating condition, the colloids are favorable for fusing the coke powder, simultaneously, 1/3 coking coal can also generate a certain amount of colloids, the strength of the produced product can be improved, coal types such as gas coal and lean coal with high volatile content are prevented from being added, thereby preventing the product from generating cracks, and being favorable for improving the yield and the quality of finished products.
The granularity of the single coal is less than 6mm, the proportion of the coal with the granularity of less than 1mm in the mixed and crushed blended coal is 90-95%, so that the blended coal, the coke powder and the binder can be fully and uniformly blended, and the local aggregation phenomenon of the materials is prevented.
And step 3: adding the pulverized coke crushed in the step 1 into the pulverized coal mixture crushed in the step 2 to form a mixture, adding a binder into the mixture, wherein the weight of the binder is 5-7% of that of the mixture, and stirring and mixing the mixture by a mixer through the binder.
The binder is solid medium temperature asphalt or solid high temperature asphalt, wherein the softening point of the high temperature asphalt is 125-135 ℃, and the softening point of the medium temperature asphalt is 80-90 ℃.
In the step 3, the mixing method of the coke powder, the blended coal and the binder is solid mixing, so that the binder can be uniformly dispersed into the coke powder and the blended coal, the problem of local aggregation caused by the fact that the binder is heated into liquid due to small quantity of the binder is avoided, and meanwhile, the heating energy consumption can be reduced.
And 4, step 4: and (4) adding the stirred and mixed material in the step (3) into a rolling ball machine to roll the material balls, wherein the size of the material balls is 15 x 20 mm. If the size of the material balls is too large, the carbonization difficulty is increased when carbonization is carried out in a subsequent carbonization furnace, and excessive cracking of formed coke products can be caused, so that the yield is greatly reduced; in addition, the material balls with overlarge sizes consume more energy consumption in the carbonization process, and the production cost is increased. The smaller the size of the material ball, the higher the preparation difficulty and cost, and the too small size of the material ball is not beneficial to gasification reaction in a blast furnace
And 5: adding the material balls prepared in the step 4 into a carbonization furnace for carbonization; the heating method of carbonization comprises the following steps: the temperature is raised from the normal temperature to 1000 ℃ at the heating speed of 6-8 ℃/min, and the temperature is kept constant for 30min at the temperature of 1000 ℃, complex procedures of hardening, tar spraying and coke powder sticking are not needed, the rapid preparation of products with qualified quality is facilitated, the constant temperature time is short, and the energy consumption and the production cost can be saved on the basis of ensuring the improvement of the product quality.
Step 6: discharging the material carbonized in the step 5 out of the furnace, and performing heat exchange and cooling through nitrogen gas to obtain a formed coke product; gas generated by the carbonization and pyrolysis of the material balls is desulfurized and tar-removed, then is recycled to the carbonization furnace for heating the carbonization furnace, and part of gas can be collected for other purposes, so that internal circulation of gas in the heating process is realized, energy is saved, and the process is economical.
The invention reprocesses and recycles the waste coke powder, so that the coke reactivity CRI of the produced formed coke product can reach 37-39%, the strength CSR after the coke reaction can reach 44-46%, the formed coke product can partially replace the coke for the blast furnace, the formed coke product is added into the blast furnace to generate gasification reaction, a large amount of CO reducing gas is generated to reduce iron ore in the blast furnace, the fuel consumption in the production process of the blast furnace is reduced, the production cost in the iron-making process is reduced, and the problem of coke shortage caused by coal limitation requirements is also solved.
Example 1:
step 1: waste coke powder produced in the processes of coke loading, unloading, transportation, production and the like purchased from manufacturers is crushed by a crusher, wherein the ash content in the coke powder is 12%, the volatile matter content is 1%, the fixed carbon content is 87%, and the weight of the coke powder accounts for 55% of the total weight of the coke powder and the blended coal. The crushing granularity of the coke powder is less than 1 mm.
Step 2: adding fat coal with the granularity of less than 6mm and 1/3 coking coal purchased from manufacturers into a crusher, stirring, mixing and crushing to prepare blended coal, wherein the proportion of the coal with the granularity of less than 1mm in the blended coal after mixing and crushing is 90%; the weight of the fat coal accounts for 15 percent of the total weight of the coke powder and the blended coal, and the ash content A of the fat coald8% volatile matter VMd15 percent; the 1/3 coking coal accounts for 30% of the total weight of the coke powder and the blended coal, and ash content A of 1/3 coking coald7.5% volatile matter VMdThe content was 33%.
And step 3: adding the pulverized coke crushed in the step 1 into the mixed and crushed coal crushed in the step 2 to form a mixed material, adding medium-temperature asphalt serving as a binder into the mixed material, wherein the weight of the medium-temperature asphalt is 7% of that of the mixed material, and performing solid stirring and mixing on the mixed material through the binder by a mixer.
And 4, step 4: and (4) adding the stirred and mixed material in the step (3) into a rolling ball machine to roll the material balls, wherein the size of the material balls is 15 x 20 mm.
And 5: adding the material balls prepared in the step 4 into a carbonization furnace for carbonization; the heating method of carbonization comprises the following steps: heating from normal temperature to 1000 deg.C at a heating rate of 6 deg.C/min, and holding at 1000 deg.C for 30 min.
Step 6: discharging the material carbonized in the step 5 out of the furnace, performing heat exchange cooling through gas to obtain a formed coke product, and treating the gas after heat exchange and recycling the gas to the carbonization furnace for heating.
In this example, the formed coke product produced had a coke reactivity CRI of 37.2% and a coke post-reaction strength CSR of 46%.
Example 2:
step 1: waste coke powder generated in the processes of coke loading, unloading, transportation, production and the like purchased from manufacturers is crushed by a crusher, wherein in the coke powder, the ash content is 13%, the volatile content is 1%, the fixed carbon is 86%, and the weight of the coke powder accounts for 60% of the total weight of the coke powder and the blended coal. The crushing granularity of the coke powder is less than 1 mm.
Step 2: adding fat coal with the granularity of less than 6mm and 1/3 coking coal purchased from manufacturers into a crusher, stirring, mixing and crushing to prepare blended coal, wherein the proportion of the coal with the granularity of less than 1mm in the blended coal after mixing and crushing is 93%; the weight of the fat coal accounts for 15 percent of the total weight of the coke powder and the blended coal, and the ash content A of the fat coald10% of volatile matter VMd20 percent; the 1/3 coking coal accounts for 25% of the total weight of the coke powder and the blended coal, and ash content A of 1/3 coking coald6.5% volatile matter VMdThe content was 35%.
And step 3: adding the pulverized coke in the step 1 into the pulverized coal mixture in the step 2 to form a mixture, adding high-temperature asphalt serving as a binder into the mixture, wherein the weight of the high-temperature asphalt is 5% of that of the mixture, and stirring and mixing the mixture in a solid state by a mixer through the binder.
And 4, step 4: and (4) adding the stirred and mixed material in the step (3) into a rolling ball machine to roll the material balls, wherein the size of the material balls is 15 x 20 mm.
And 5: adding the material balls prepared in the step 4 into a carbonization furnace for carbonization; the heating method of carbonization comprises the following steps: heating from normal temperature to 1000 deg.C at a heating rate of 8 deg.C/min, and holding the temperature at 1000 deg.C for 30 min.
Step 6: discharging the material carbonized in the step 5 out of the furnace, performing heat exchange cooling through gas to obtain a formed coke product, and treating the gas after heat exchange and recycling the gas to the carbonization furnace for heating.
In this example, the formed coke product produced had a coke reactivity CRI of 37.8% and a coke post-reaction strength CSR of 45.4%.
Example 3:
step 1: waste coke powder produced in the processes of coke loading, unloading, transportation, production and the like purchased from manufacturers is crushed by a crusher, wherein the ash content in the coke powder is 12.5 percent, the volatile matter is 1.5 percent, the fixed carbon is 86 percent, and the weight of the coke powder accounts for 60 percent of the total weight of the coke powder and the blended coal. The crushing granularity of the coke powder is less than 1 mm.
Step 2: adding fat coal with the granularity of less than 6mm and 1/3 coking coal purchased from manufacturers into a crusher, stirring, mixing and crushing to prepare blended coal, wherein the proportion of the coal with the granularity of less than 1mm in the blended coal after mixing and crushing is 95%; the weight of the fat coal accounts for 15 percent of the total weight of the coke powder and the blended coal, and the ash content A of the fat coald8% volatile matter VMdIs 25%; the 1/3 coking coal accounts for 25% of the total weight of the coke powder and the blended coal, and ash content A of 1/3 coking coald7.5% volatile matter VMdThe content was 34%.
And step 3: adding the pulverized coke crushed in the step 1 into the mixed and crushed coal crushed in the step 2 to form a mixed material, adding medium-temperature asphalt serving as a binder into the mixed material, wherein the weight of the medium-temperature asphalt is 5% of that of the mixed material, and performing solid stirring and mixing on the mixed material through the binder by a mixer.
And 4, step 4: and (4) adding the stirred and mixed material in the step (3) into a rolling ball machine to roll the material balls, wherein the size of the material balls is 15 x 20 mm.
And 5: adding the material balls prepared in the step 4 into a carbonization furnace for carbonization; the heating method of carbonization comprises the following steps: heating from normal temperature to 1000 deg.C at a heating rate of 8 deg.C/min, and holding the temperature at 1000 deg.C for 30 min.
Step 6: discharging the material carbonized in the step 5 out of the furnace, performing heat exchange cooling through gas to obtain a formed coke product, and treating the gas after heat exchange and recycling the gas to the carbonization furnace for heating.
In this example, the formed coke product produced had a coke reactivity CRI of 38.2% and a coke post-reaction strength CSR of 45.1%.
Example 4:
step 1: waste coke powder produced in the processes of coke loading, unloading, transportation, production and the like purchased from manufacturers is crushed by a crusher, wherein the ash content in the coke powder is 13%, the volatile matter content is 1%, the fixed carbon content is 86%, and the weight of the coke powder accounts for 51% of the total weight of the coke powder and the blended coal. The crushing granularity of the coke powder is less than 1 mm.
Step 2: adding fat coal with the granularity of less than 6mm and 1/3 coking coal purchased from manufacturers into a crusher, stirring, mixing and crushing to prepare blended coal, wherein the proportion of the coal with the granularity of less than 1mm in the blended coal after mixing and crushing is 90%; the weight of the fat coal accounts for 24 percent of the total weight of the coke powder and the blended coal, and the ash content A of the fat coald9% volatile matter VMd23%; the 1/3 coking coal accounts for 25% of the total weight of the coke powder and the blended coal, and ash content A of 1/3 coking coald7.5% volatile matter VMdThe content was 35%.
And step 3: adding the pulverized coke in the step 1 into the pulverized coal mixture in the step 2 to form a mixture, adding high-temperature asphalt serving as a binder into the mixture, wherein the weight of the high-temperature asphalt is 5% of that of the mixture, and stirring and mixing the mixture in a solid state by a mixer through the binder.
And 4, step 4: and (4) adding the stirred and mixed material in the step (3) into a rolling ball machine to roll the material balls, wherein the size of the material balls is 15 x 20 mm.
And 5: adding the material balls prepared in the step 4 into a carbonization furnace for carbonization; the heating method of carbonization comprises the following steps: heating from normal temperature to 1000 deg.C at a heating rate of 6 deg.C/min, and holding at 1000 deg.C for 30 min.
Step 6: discharging the material carbonized in the step 5 out of the furnace, performing heat exchange cooling through gas to obtain a formed coke product, and treating the gas after heat exchange and recycling the gas to the carbonization furnace for heating.
In this example, the formed coke product produced had a coke reactivity CRI of 38.8% and a coke post-reaction strength CSR of 44.7%.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. A production method of high-value formed coke of waste coke powder is characterized by comprising the following steps: the method comprises the following steps:
step 1: crushing waste coke powder, wherein in the coke powder, the ash content is 12-13%, the volatile matter content is 1-1.5%, the fixed carbon content is 86-87%, and the weight of the coke powder accounts for 45-60% of the total weight of the coke powder and the blending coal;
step 2: stirring, mixing and crushing the single coal according to a proportion to prepare blended coal; the single coal comprises fat coal and 1/3 coking coal, wherein the weight of the fat coal accounts for 15-25% of the total weight of the coke powder and the blended coal, and the weight of the 1/3 coking coal accounts for 25-30% of the total weight of the coke powder and the blended coal;
and step 3: adding the pulverized coke in the step 1 into the pulverized coal mixture in the step 2 to form a mixture, adding a binder into the mixture, wherein the weight of the binder is 5-7% of that of the mixture, and stirring and mixing the mixture with the binder;
and 4, step 4: carrying out double-roller ball pressing on the stirred and mixed material in the step 3, wherein the size of the material balls is 15 x 20 mm;
and 5: adding the material balls prepared in the step 4 into a carbonization furnace for carbonization; the heating method of carbonization comprises the following steps: heating from normal temperature to 1000 ℃ at a heating speed of 6-8 ℃/min, and keeping the temperature at 1000 ℃ for 30 min;
step 6: discharging the material carbonized in the step 5 out of the furnace, performing heat exchange cooling through gas to obtain a formed coke product, and treating the gas after heat exchange and recycling the gas to the carbonization furnace for heating.
2. The method for producing high-value formed coke from waste coke powder as claimed in claim 1, wherein: in the step 1, the crushing particle size of the coke powder is less than 1 mm.
3. The method for producing high-value formed coke from waste coke powder according to claim 1The method is characterized in that: in said step 2, the ash content A of the fat coald8-10% of volatile component VMd15-25%; ash content A of said 1/3 coking coald6.5-7.5% of volatile component VMdIs 33-35%.
4. The method for producing high-value formed coke from waste coke powder as claimed in claim 1 or 3, wherein: in the step 2, the granularity of single coal is less than 6mm, and the proportion of coal with the granularity of less than 1mm in the mixed and crushed blended coal is 90-95%.
5. The method for producing high-value formed coke from waste coke powder as claimed in claim 1, wherein: in the step 3, the binder is solid medium temperature asphalt or solid high temperature asphalt, wherein the softening point of the high temperature asphalt is 125-135 ℃, and the softening point of the medium temperature asphalt is 80-90 ℃.
6. The method for producing high-value formed coke from waste coke powder as claimed in claim 1 or 5, wherein: in the step 3, the mixing method of the coke powder, the blending coal and the binder is solid mixing.
7. The method for producing high-value formed coke from waste coke powder as claimed in claim 1, wherein: in step 6, the formed coke product has a coke reactivity CRI of 37-39% and a coke post-reaction intensity CSR of 44-46%.
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