CN115124037B - Broken carbon prepared by high molasses briquettes and method for producing broken carbon prepared by high molasses briquettes - Google Patents
Broken carbon prepared by high molasses briquettes and method for producing broken carbon prepared by high molasses briquettes Download PDFInfo
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- CN115124037B CN115124037B CN202110336379.3A CN202110336379A CN115124037B CN 115124037 B CN115124037 B CN 115124037B CN 202110336379 A CN202110336379 A CN 202110336379A CN 115124037 B CN115124037 B CN 115124037B
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Abstract
The invention relates to high molasses briquetting broken carbon and a method for producing the same, wherein the initial materials for preparing the Gao Tangmi briquetting broken carbon are a mixture of weakly caking coal A and weakly caking coal B; the weak sticky coal A is weak sticky coal of a coal bed of 3-1 of the Shenmu coal, and the weak sticky coal B is weak sticky coal of a coal bed of 2-2 of the Shenmu coal. According to the scheme, a certain proportion of weak-viscosity coal of the Shenmu coal 2-2 coal bed is added into weak-viscosity coal of the Shenmu coal 3-1 coal bed, and the weak-viscosity coal is subjected to forming, carbonization and activation processes, so that the requirement of improving the index of the molasses value of the generated pressed block broken carbon is met.
Description
Technical Field
The invention relates to the technical field of briquetting broken carbon, in particular to high-molasses briquetting broken carbon and a production method thereof.
Background
The briquetted broken carbon is used as an active carbon product, the production raw materials are mainly single coal with certain cohesiveness and are mixed with caking materials such as coal tar pitch, coal-based briquetted active carbon is produced through the processes of grinding, briquetting, carbonization and activation, or gas coal and fat coal with special cohesiveness are matched with other coal types such as anthracite, lignite and the like by referring to a coal blending coking technology, and sometimes binders such as coal tar pitch or coal tar pitch are added for uniform mixing, or the coal-based briquetted active carbon is produced through the processes of briquetting, drying, carbonization and activation by dipping magnesium nitrate and the like before activation after carbonization.
The residues of coal-based briquetted broken carbon, coal pitch and the like produced in the mode usually block the pores of the activated carbon, so that the molasses value of the produced activated carbon is less than 160, even the molasses value is 0, the requirements of removing organic macromolecules are difficult to meet, and the decolorizing effect is poor. In addition, the process flow is complex, and gas coal and fat coal with high quality and special cohesiveness are used, so that the production cost of the activated carbon is high. In the prior art, in order to enlarge the aperture of the activated carbon and increase the proportion of the medium and large pores of the activated carbon, a mode of prolonging the activation time is generally adopted, so that the burning loss of the activated carbon in an activation furnace is increased, the strength is reduced, and the service life is shortened. Other substances which are beneficial to improving pores in the preparation process of the active carbon, such as nitrate of iron, cobalt and the like, are added in the preparation process of the raw material coal, so that the cost of the produced active carbon product is increased, and large-scale production cannot be realized, or the cost is increased, the process flow is prolonged, and the production efficiency is reduced by dipping magnesium nitrate and the like before activation after carbonization.
Disclosure of Invention
The invention aims to provide high-molasses briquetting broken carbon and a production method thereof, which solve the problems that the briquetted broken carbon has a low molasses value, and in the existing method, in order to improve the molasses value of active carbon, a mode of prolonging the activation time is adopted, so that the burning loss of the active carbon in an activation furnace is increased, the strength is reduced and the service life is shortened.
In order to achieve the aim of the invention, the invention provides high-molasses briquetting broken carbon, wherein the initial material for preparing the Gao Tangmi briquetting broken carbon is a mixture of weakly caking coal A and weakly caking coal B; the weak sticky coal A is weak sticky coal of a coal bed of 3-1 of the Shenmu coal, and the weak sticky coal B is weak sticky coal of a coal bed of 2-2 of the Shenmu coal.
According to one aspect of the invention, the mass percentage content of the weakly caking coal B in the initial material is 20-40%.
According to one aspect of the invention, the Gao Tangmi briquette crushed carbon has a molasses value of greater than 200, methylene blue of greater than 180mg/g, a drum strength of greater than 94% and an iodine value of greater than 950mg/g.
According to one aspect of the invention, the fineness of the initial material meets a sieving rate of greater than 80% on a 325 mesh taylor standard sieve.
According to one aspect of the invention, the weakly caking coal a satisfies: ash content less than or equal to 4.5% (wt%), volatile matter 33-38% (wt%), coke residue characteristics 3-4 type, stacking specific weight 800-900g/l;
the weakly caking coal B satisfies the following conditions: ash content less than or equal to 4.5% (wt%), volatile matter 33-38% (wt%), coke residue characteristics 3-4, and stacking ratio weight 700-780g/l.
To achieve the above object, the present invention provides a method for producing crushed carbon of high molasses briquettes, comprising the steps of:
s1, mixing and grinding weakly caking coal A and weakly caking coal B to obtain a powdery initial material;
s2, carrying out extrusion molding by a briquetting machine based on the initial material to obtain a molding material;
s3, carbonizing the molding material to obtain carbonized material;
s4, activating treatment is carried out based on the carbonized material to obtain the Gao Tangmi briquetting broken carbon.
According to one aspect of the invention, in the step S1, the content of the weakly caking coal B in the initial material is 20% -40% by mass.
According to one aspect of the invention, the Gao Tangmi briquette crushed char has a molasses value of greater than 200.
According to one aspect of the invention, the Gao Tangmi briquette crushed charcoal methylene blue is greater than 180mg/g.
According to one aspect of the invention, the Gao Tangmi briquette crushed carbon has a drum strength of greater than 94%.
According to one aspect of the invention, the Gao Tangmi briquetted crushed carbon has an iodine value of greater than 950mg/g.
According to one aspect of the invention, the fineness of the initial material meets a sieving rate of greater than 80% on a 325 mesh taylor standard sieve.
According to one aspect of the invention, the forming stock has a roller strength of greater than 85%.
According to one aspect of the present invention, in the step S3, in the step of obtaining a carbonized material based on the molded material, the molded material is carbonized in a carbonization furnace to obtain the carbonized material after carbonization treatment;
the temperature of the tail of the carbonization furnace is controlled to be 260-350 ℃, the temperature in the furnace is controlled to be 450-500 ℃, and the temperature of the furnace head is controlled to be 550-620 ℃;
the power of the transmission motor of the carbonization furnace is 11KW, and the frequency is set at 20-26 Hz.
According to one aspect of the invention, in the step S4, in the step of obtaining the Gao Tangmi briquetted crushed carbon by performing an activation treatment based on the carbonized material, the activating agent used is water vapor and flue gas.
According to one aspect of the invention, in the step S4 of obtaining the Gao Tangmi briquetted crushed carbon based on the carbonized material being subjected to an activation treatment, the carbonized material is subjected to an activation treatment in an activation furnace to obtain the Gao Tangmi briquetted crushed carbon;
the activation furnace includes: the device comprises a preheating section, a supplementary carbonization section, an activation section, a first cooling section, a second cooling section, an upper connecting flue, a lower connecting flue and a regenerator;
the activation section is provided with a fifth point location, a sixth point location, a seventh point location and an eighth point location for controlling temperature.
According to one aspect of the present invention, the control temperatures of the fifth point location, the sixth point location, the seventh point location, and the eighth point location are: 920-970 ℃.
According to one aspect of the invention, the steam pressure of the activation furnace is 0.35-0.5MPa, and the steam flow is 1.5-3.0m 3 And/h, air flow rate is 500-700m 3 And/h, the furnace pressure is 55-95Pa, and the pumping force is 120-160 Pa.
According to one aspect of the present invention, in step S1, the weakly caking coal a is a weakly caking coal of a coal bed of shen-yak 3-1, which satisfies the following conditions: ash content less than or equal to 4.5% (wt%), volatile matter 33-38% (wt%), coke residue characteristics 3-4 type, stacking specific weight 800-900g/l;
the weakly caking coal B is weakly caking coal of a coal bed of 2-2 of Shenmu coal, and meets the following conditions: ash content less than or equal to 4.5% (wt%), volatile matter 33-38% (wt%), coke residue characteristics 3-4, and stacking ratio weight 700-780g/l.
The beneficial effect after the technical scheme is that:
by adding a certain amount of weak-viscosity coal of the coal bed 2-2 of the Shenmu coal into the weak-viscosity coal of the coal bed 3-1 of the Shenmu coal, the method realizes that the molasses value index of the briquette broken carbon (namely active carbon) prepared by carrying out dry powder compression molding by only using the weak-viscosity coal without adding any viscous materials such as coal pitch, fat coal and the like is higher, and the high molasses briquette broken carbon with the strength of more than 94% and the iodine value can be obtained.
The briquetting broken carbon produced by the scheme has the characteristics of large adsorption capacity, high adsorption speed, high organic macromolecule removal rate and strong decolorizing capability.
The fineness of the initial material reaches the fineness, so that the method is beneficial to the pore generation and strength of the high molasses briquetting broken carbon generated later and is beneficial to ensuring the high performance of the product.
The prepared briquetting broken carbon product has molasses value of >200, methylene blue of >180mg/g, iodine value of >950mg/g and roller strength of >94%, namely the activated carbon product has developed mesopores and macropores and has higher iodine value.
The preparation process is simple, any viscous materials such as coal tar pitch, fat coal and the like are not added in the traditional coal-based activated carbon preparation process in the forming process, the problems of product quality reduction caused by uneven mixing caused by the use of the viscous materials, environmental protection in the production process caused by high dust emission when the coal tar pitch is used and high cost caused by the addition of the viscous materials are solved, and the production efficiency can be improved.
The product prepared by the method can eliminate the mixing and stirring process, the sedimentation process, the filter pressing and separating process and the slag removing process for preparing the traditional high molasses wood activated carbon; a large number of personnel can be reduced, the production period is shortened, the energy is saved, and the yield is improved; the strength of the prepared high molasses briquetting broken carbon is over 94 percent, the requirements of activated carbon regeneration equipment and regeneration technology are also met, and the used briquetting broken carbon can be repeatedly used after regeneration, so that the material cost is greatly reduced.
The invention adopts scientific coal preparation, formula optimization and process exploration, the molasses value of the pressed crushed carbon can reach more than 200, and the method can replace the decolorization of the wood powder activated carbon produced by a chemical method, thereby completely meeting the index requirements of sugar factories, pharmaceutical factories and beverage factories.
Drawings
FIG. 1 is a block diagram schematically showing the steps of a method for producing high molasses briquetting broken carbon according to an embodiment of the invention.
Detailed Description
The present invention will be described in detail below with reference to the drawings and the specific embodiments, which are not described in detail herein, but the embodiments of the present invention are not limited to the following embodiments.
Broken charcoal of high molasses briquetting
According to one embodiment of the invention, in the high molasses briquetting broken carbon of the invention, the initial material for preparing Gao Tangmi briquetting broken carbon is a mixture of weakly caking coal A and weakly caking coal B; the weak sticky coal A is weak sticky coal of a coal bed of 3-1 of the Shenmu coal, and the weak sticky coal B is weak sticky coal of a coal bed of 2-2 of the Shenmu coal.
According to one embodiment of the invention, the mass percentage content of the weakly caking coal B in the initial material is 20-40%.
According to one embodiment of the invention, the molasses briquette crushed carbon has a molasses value of greater than 200, methylene blue of greater than 180mg/g, a roller strength of greater than 94% and an iodine value of greater than 950mg/g.
According to one embodiment of the invention, the fineness of the initial material meets a sieving rate of greater than 80% on a 325 mesh taylor standard sieve.
According to one embodiment of the present invention, the weakly caking coal a satisfies: ash content less than or equal to 4.5% (wt%), volatile matter 33-38% (wt%), coke residue characteristics 3-4 type, stacking specific weight 800-900g/l;
the weakly caking coal B satisfies the following conditions: ash content less than or equal to 4.5% (wt%), volatile matter 33-38% (wt%), coke residue characteristics 3-4, and stacking ratio weight 700-780g/l.
Preparation process of high-molasses briquetting broken carbon
As shown in fig. 1, according to an embodiment of the present invention, a method for producing high molasses briquetting broken char of the present invention includes the steps of:
s1, adding weakly caking coal (weakly caking coal B) of a coal bed of 2-2 of the Shenmu coal into weakly caking coal (weakly caking coal A) of a coal bed of 3-1 of the Shenmu coal, and grinding to obtain a powdery initial material;
s2, extrusion molding is carried out through a briquetting machine based on the initial material to obtain a molding material;
s3, carbonizing based on the molding material to obtain carbonized material;
s4, activating treatment is carried out based on the carbonized materials to obtain the high-molasses briquetting broken carbon.
According to one embodiment of the invention, in the step S1, weakly caking coal of the Shenmu coal 3-1 coal bed meets the following conditions: ash content is less than or equal to 4.5%, volatile matter is 33-38%, and coke residue characteristics are 3-4 type; the weak sticky coal of the Shenmu coal 2-2 coal bed meets the following conditions: ash content less than or equal to 4.5% (wt%), volatile matter 33-38% (wt%), coke residue characteristics 3-4, and stacking ratio weight 700-780g/l.
As shown in fig. 1, in step S1, the weakly caking coal of the coal seam 2-2 of the raw material is 20% -40% by mass.
Through the arrangement, the weak sticky coal of the coal bed 2-2 of the Shenmu coal is added into the weak sticky coal of the coal bed 3-1 of the Shenmu coal, so that macropores are easy to form during the activation reaction, and the method is beneficial to effectively improving the performance of a finished product.
Through the arrangement, the requirement of improving the molasses value index of the generated briquetting broken carbon (namely active carbon) is met by adding the weak sticky coal of the coal bed 2-2 of the Shenmu coal into the weak sticky coal of the coal bed 3-1 of the Shenmu coal.
According to one embodiment of the invention, the briquetted crushed char has a molasses value of greater than 200. In this embodiment, the iodine value of the briquette crushed carbon is greater than 950mg/g. In this embodiment, the methylene blue of the briquette crushed carbon is greater than 180mg/g. In this embodiment, the drum strength of the briquetted crushed carbon is greater than 94%.
Determination of index of broken carbon product of high-molasses briquetting
The roller strength is a standard term, and the detection is that the sample is weighed and then put into an instrument to vibrate, rub and impact, and then is screened according to a specified screen, and the residual sample in the screen is weighed and divided by the original sample mass by 100 percent, so the roller strength is the mass fraction. In the invention, the roller strength measuring method executes GB/T7702.3-2008.
The methylene blue adsorption value can be used for representing the adsorption performance of a sample, and in the invention, GB/T7702.6-2008 is adopted for measuring the methylene blue adsorption value.
The iodine value can be used for representing the development condition of the pore structure of the activated carbon and analyzing the adsorption performance of the activated carbon on other substances. In the present invention, the method for measuring iodine value of activated carbon is carried out in GB/T7702.7-1987.
Molasses values are a method of measuring the relative decolorizing capacity of activated carbon in boiling molasses solutions. Molasses values refer to the smallest pore size that can enter the activated carbon of 2.8nm. The molasses values were obtained by treating molasses liquid with activated carbon standard and a sample of activated carbon to be tested, and calculating the ratio of the optical densities of the filters. In the invention, the molasses value determination method of the activated carbon performs the following enterprise standard determination.
Method for measuring molasses value of active carbon
1. Preparation and calibration of Jiao Tangyuan liquid
Weighing 250g of glucose, adding 250ml of distilled water to dissolve in a 1L beaker, placing the beaker in a glycerin solution, stirring, adding 5g of anhydrous calcium carbonate when the temperature is raised to 105 ℃, adding 5g of ammonium chloride when the temperature of sugar solution is raised to 110 ℃, keeping the temperature of the sugar solution at 125 ℃ for 30 minutes, slowly adding a sodium carbonate solution, continuously stirring until foam disappears, cooling and placing in a refrigerator for standby.
Taking out from the refrigerator, weighing 20g of caramel stock solution, weighing 100ml of distilled water, dissolving completely, taking 25ml of distilled water, adding 5ml of diluted sugar solution, and measuring the absorbance of the sugar solution to 0.670-0.690 by using a spectrophotometer.
Heating the prepared sugar solution to 90 ℃, taking down, cooling to 20 ℃ while stirring the ice-water mixture, putting into a refrigerator, cooling for 30 minutes, and taking out for use.
2. Preparation and measurement of samples
Grinding an activated carbon sample until the passing rate reaches 325 meshes, drying at 150 ℃ for 2 hours, weighing 0.92g of the sample, adding 100ml of sugar solution, boiling for 30 minutes on an electric furnace, cooling, filtering, measuring by using a 5 x 10 cuvette, and measuring a standard sample by using the same method.
Calculation of molasses value = absorbance of standard × standard value/test value absorbance
The briquetting broken carbon generated by the scheme has the characteristics of high mesoporous and macroporous ratio, high organic macromolecule removal rate and strong decoloring capability.
As shown in fig. 1, according to one embodiment of the present invention, the fineness of the initial material satisfies a sieving rate of more than 80% on a 325 mesh taylor standard sieve.
Through the arrangement, the fineness of the initial material reaches the fineness, so that the pore generation and strength of the pressed crushed carbon generated later are beneficial to ensuring the high performance of the product.
As shown in fig. 1, according to one embodiment of the present invention, the roll strength of the molding compound is greater than 85%. In this embodiment, the starting material is extruded through a briquetting machine to obtain a shaped material having a strength of greater than 85%.
Through above-mentioned setting, through guaranteeing the intensity of shaping material in this scheme, and then to the intensity and the yield of the finished product of follow-up formation are useful.
As shown in fig. 1, in the step S3 of obtaining a carbonized material based on a molded material, the molded material is carbonized in a carbonization furnace to obtain the carbonized material according to an embodiment of the present invention. In the embodiment, the temperature of the tail of the carbonization furnace is controlled to be 260-350 ℃, the temperature in the furnace is controlled to be 450-500 ℃, and the temperature of the furnace head is controlled to be 550-620 ℃. In the embodiment, the carbonization furnace is a rotary carbonization furnace, the power of a transmission motor of the carbonization furnace is 11KW, and the rotation frequency is set at 20-26 Hz.
Through the arrangement, the working temperature and the motor frequency in the carbonization furnace are set in the range, so that the generated product has the effect of high strength.
According to one embodiment of the invention, in the step S4, the activating agent adopted in the step of obtaining the broken carbon of the high-molasses briquetting based on the carbonized material through the activating treatment is water vapor and flue gas.
According to one embodiment of the present invention, in the step S4 of obtaining the high molasses briquetting broken carbon based on the activation treatment of the carbonized material, the carbonized material is subjected to the activation treatment in the activation furnace to obtain the high molasses briquetting broken carbon. In this embodiment, the activation furnace includes: the device comprises a preheating section, a supplementary carbonization section, an activation section, a first cooling section, a second cooling section, an upper connecting flue, a lower connecting flue and a regenerator;
the first cooling section is provided with a first point location and a second point location for controlling temperature;
the second cooling section is provided with a third point location and a fourth point location for controlling temperature;
the activation section is provided with a fifth point location, a sixth point location, a seventh point location and an eighth point location for controlling the temperature;
the supplementary carbonization section is provided with a ninth point and a tenth point for controlling the temperature;
the upper flue connecting section is provided with an eleventh point and a twelfth point for controlling the temperature;
the heat storage section is provided with a thirteenth point and a fourteenth point for controlling the temperature;
the lower connecting flue connecting section is provided with a fifteenth point position for controlling temperature.
As shown in fig. 1, according to an embodiment of the present invention, the control temperatures of the first point location and the second point location are: 780-800 ℃;
the control temperature of the third point location and the fourth point location is as follows: 880-900 ℃;
the control temperatures of the fifth point location, the sixth point location, the seventh point location and the eighth point location are as follows: 920-970 ℃;
the control temperature of the ninth point location and the tenth point location is as follows: 940-960 deg.c;
the control temperatures of the eleventh point and the twelfth point are as follows: 880-930 DEG C
The control temperature of the thirteenth point and the fourteenth point is as follows: 1020-1060 ℃.
The control temperature of the fifteenth point is as follows: 780-800 ℃.
According to one embodiment of the invention, the pressure of steam (steam) in the activation furnace is 0.35-0.5MPa, and the steam flow is 1.5-3.0m 3 Air (air introduced from outside) flow rate 500-700m 3 And/h, the furnace pressure is 55-95Pa, the pumping force is 120-160 Pa, and the activation time is 24-26h. It should be noted that the air flow rate and the steam flow rate can be adjusted according to the temperature and the furnace pressure in the process of performing the activation treatment.
Through the arrangement, the proportion of the mesopores and macropores of the product obtained by the scheme is improved, the shape and the quantity of the pores meet the requirements, and the adsorption and decolorization effects in the use process are achieved. In addition, the activated material is the high-molasses briquetting broken carbon, and then the high-molasses briquetting broken carbon is obtained after screening, so that the effects of the molasses value of the product of >200, the methylene blue of >180mg/g, the iodine value of >950mg/g, the roller strength of >94% and the filling density of >380g/l are realized.
To further illustrate the invention, the following examples are set forth.
Examples
Example 1
Grinding the weakly caking coal of the coal bed 3-1 of the Shen wood coal by a mill until the fineness of the initial material meets the standard sieve with 325 meshes, extruding and forming the mixture on a briquetting machine (the current of the briquetting machine is required to be 110-150A, the working pressure is 15 MPa), then carrying out carbonization treatment in a rotary carbonization furnace (the power of a transmission motor of the carbonization furnace is 11KW, the frequency is set at 20-26 Hz) under the condition of 300-620 ℃, obtaining carbonized materials after 30-40min, activating the carbonized materials in an activating furnace with steam and flue gas for 24-26h under the condition of 920-970 ℃ to obtain the activated carbon, and determining indexes such as molasses value, iodine value, strength and the like of the product, wherein the molasses value 158 of the activated carbon is found to be lower than 200.
Example 2
Experiments are carried out by providing different coal formulas from example 1, mixing 10% by mass of weak-viscosity coal of a coal bed of 2-2 of the Shenmu coal with 90% by mass of weak-viscosity coal of a coal bed of 3-1 of the Shenmu coal, grinding, forming, carbonizing and activating to prepare briquetted broken carbon, measuring indexes such as molasses value, iodine value and strength of the product, and finding out that the molasses value of the activated carbon is 192 and lower than 200.
Example 3
Experiments are carried out by providing different coal formulas from the embodiment 1, mixing weakly caking coal of a coal bed 2-2 of the Shen-wood coal with a mass percentage of 20% and weakly caking coal of a coal bed 3-1 of the Shen-wood coal with a mass percentage of 80%, grinding, forming, carbonizing and activating to prepare briquetted broken carbon, measuring indexes such as molasses value, iodine value and strength of the product, finding out an activated carbon molasses value 205, and the other indexes are all qualified, thus obtaining the high-molasses briquetted broken carbon.
Example 4
Experiments are carried out by providing different coal formulas from example 1, mixing weakly caking coal of a coal bed 2-2 of the Shenmu coal with a mass percentage of 30% and weakly caking coal of a coal bed 3-1 of the Shenmu coal with a mass percentage of 70%, grinding, forming, carbonizing and activating to prepare briquetted broken carbon, determining indexes such as molasses value, iodine value, strength and the like of the product to find an activated carbon molasses value 211, and determining other indexes to be qualified, wherein the technological conditions are the same as those of example 1.
Example 5
An experiment was performed by providing a coal type formula different from that of example 1, mixing weakly caking coal of a coal bed 2-2 of the Shenmu coal with a coal bed 3-1 of the Shenmu coal with a coal bed weight percentage of 60%, grinding, forming, carbonizing and activating to prepare briquetted broken carbon, determining indexes such as molasses value, iodine value and strength of the product to find an activated carbon molasses value 215, and determining that other indexes are qualified, wherein the technological conditions are the same as those of example 1.
Example 6
Providing a coal type formula different from that of the embodiment 1, carrying out experiments, mixing weakly caking coal of a coal bed 2-2 of the Shen-wood coal with a coal bed 3-1 of the Shen-wood coal with a coal weight percentage of 50%, grinding, forming, carbonizing and activating to prepare pressed crushed carbon, wherein the process conditions are the same as those of the embodiment 1, and determining that the molasses value of the product is more than 200, the iodine value is lower than 950mg/g, and the filling density is lower than 380g/l (the filling density is required to be more than or equal to 380g/l in GB/T7701.2-2008), so that the product is a disqualified product.
Example 7
Providing a coal type formula different from that of the embodiment 1, carrying out experiments, mixing weakly caking coal of a coal bed 2-2 of the Shen-wood coal with a mass percentage of 60% and weakly caking coal of a coal bed 3-1 of the Shen-wood coal with a mass percentage of 40%, grinding, forming, carbonizing and activating to prepare pressed crushed carbon, wherein the process conditions are the same as those of the embodiment 1, and determining that the molasses value of the product is more than 200, the iodine value is lower than 950mg/g, and the filling density is lower than 380g/l (the filling density is required to be more than or equal to 380g/l in GB/T7701.2-2008), so as to obtain a disqualified product.
Example 8
Providing a coal type formula different from that of the embodiment 1, carrying out experiments, mixing weakly caking coal of a coal bed 2-2 of the Shen-wood coal with a mass percentage of 70% and weakly caking coal of a coal bed 3-1 of the Shen-wood coal with a mass percentage of 30%, grinding, forming, carbonizing and activating to prepare pressed crushed carbon, wherein the process conditions are the same as those of the embodiment 1, and determining that the molasses value of the product is more than 200, the iodine value is lower than 950mg/g, and the filling density is lower than 380g/l (the filling density is required to be more than or equal to 380g/l in GB/T7701.2-2008), so as to obtain a disqualified product.
Example 9
Providing a coal type formula different from that of the embodiment 1, carrying out experiments, mixing weakly caking coal of a coal bed 2-2 of the Shen-wood coal with a mass percentage of 80% and weakly caking coal of a coal bed 3-1 of the Shen-wood coal with a mass percentage of 20%, grinding, forming, carbonizing and activating to prepare pressed crushed carbon, wherein the process conditions are the same as those of the embodiment 1, and determining that the molasses value of the product is more than 200, the iodine value is lower than 950mg/g, and the filling density is lower than 380g/l (the filling density is required to be more than or equal to 380g/l in GB/T7701.2-2008), so as to obtain a disqualified product.
Example 10
Providing a coal type formula different from that of the embodiment 1, carrying out experiments, mixing weakly caking coal of a coal bed 2-2 of the Shen-wood coal with a mass percentage of 90% and weakly caking coal of a coal bed 3-1 of the Shen-wood coal with a mass percentage of 10%, grinding, forming, carbonizing and activating to prepare pressed crushed carbon, wherein the process conditions are the same as those of the embodiment 1, and determining that the molasses value of the product is more than 200, the iodine value is lower than 950mg/g, and the filling density is lower than 380g/l (the filling density is required to be more than or equal to 380g/l in GB/T7701.2-2008), so as to obtain a disqualified product.
Example 11
Providing a coal type formula different from that of the embodiment 1, carrying out experiments, taking weakly caking coal of a coal bed 2-2 of the Shenmu coal with the mass percent of 100%, grinding, forming, carbonizing and activating to prepare briquetted broken carbon, wherein the process conditions are the same as those of the embodiment 1, and determining that the molasses value of the product is more than 200, the iodine value is lower than 950mg/g and the filling density is lower than 380g/l (GB/T7701.2-2008 requires the filling density to be more than or equal to 380 g/l), thereby obtaining the product which is a defective product.
Table 1 shows the product properties of the briquetted crushed carbons produced in examples 1-11. Table 1 is as follows:
TABLE 1
As can be seen from the data in Table 1, when the addition ratio of weakly caking coal in the Shenmu 2-2 coal bed is 20-40%, the prepared pressed block crushed carbon has the best quality, the molasses value is more than 200, the iodine value is more than 950mg/g, the methylene blue is more than 180mg/g, the roller strength is more than 94%, the filling density is more than 380g/L, and the pressed block crushed carbon is superior to the GB/T7701.2-2008 coal particle activated carbon standard.
Example 12
Mixing weakly caking coal of a Shenmu 2-2 coal bed with the mass fraction of 30% with weakly caking coal of a Shenmu 3-1 coal bed with the mass fraction of 70%, grinding to obtain powder materials, setting the pressure of a briquetting machine to 12MPa, setting the current to 110A, and measuring the strength of the formed materials.
Example 13
The same coal formulation as in example 12 was used to provide a briquetting machine pressure different from that of example 12, the briquetting machine pressure was set to 15MPa, the current was set to 110A, and the strength of the briquette was measured.
Example 14
The same coal formulation as in example 12 was used to provide a briquette press pressure different from that of example 12, the briquette press pressure was set at 18MPa, the current was set at 110A, and the strength of the molded material was measured.
By analysis of examples 12 to 14, the briquetting machine pressure was 15 to 18MPa, the current was set to 110A, and the strength of the formed material was more than 85%, so that the briquetting machine pressure was 15 to 18 MPa.
Example 15
Mixing weakly caking coal of a Shenmu 2-2 coal bed with the mass fraction of 30% with weakly caking coal of a Shenmu 3-1 coal bed with the mass fraction of 70%, grinding to obtain powder materials, setting the pressure of a briquetting machine to 15MPa, setting the current to 90A, and measuring the strength of the formed materials.
Example 16
The same coal formulation as in example 15 was used, a briquetting machine current different from that in example 15 was supplied, the briquetting machine pressure was set to 15MPa, the current was set to 110A, and the strength of the briquette was measured.
Example 17
The same coal formulation as in example 15 was used, a briquetting machine current different from that in example 15 was supplied, the briquetting machine pressure was set to 15MPa, the current was set to 130A, and the strength of the briquette was measured.
Example 18
The same coal formulation as in example 15 was used, a briquetting machine current different from that in example 15 was supplied, the briquetting machine pressure was set to 15MPa, the current was set to 150A, and the strength of the briquette was measured.
Table 2 shows the product properties of the briquettes crushed carbon shaped materials produced in examples 12 to 18. Table 2 is as follows:
TABLE 2
As can be seen from the analysis data in Table 2, the briquette machine current was set to 110A-150A at a briquetting machine pressure of 15MPa and the briquette machine current was set to 110A-150A at an optimum because the briquette machine current was greater than 85%.
Example 19
Mixing weakly caking coal of a coal bed 2-2 of the Shenmu with a mass fraction of 30% with weakly caking coal of a coal bed 3-1 of the Shenmu with a mass fraction of 70%, grinding to obtain powder materials, setting the pressure of a briquetting machine to 15MPa and the current to 110A to obtain a formed material, feeding the formed material into a carbonization furnace, and measuring the strength and volatile matters of the carbonized material by adjusting the tail temperature of the carbonization furnace and keeping the temperature of the furnace and the furnace end unchanged.
Example 20
Different from example 19, the temperature of the tail of the carbonization furnace, the formula of the coal type and the molding process are unchanged, the temperature of the furnace head and the inside of the carbonization furnace are unchanged, and the strength and the volatile of the carbonized material are measured.
Example 21
The temperature of the tail of the carbonization furnace is different from that of the embodiment 19, the formula of coal is unchanged, the molding process is unchanged, the temperature of the furnace head and the inside of the carbonization furnace are unchanged, and the strength and the volatile components of the carbonized material are measured.
Table 3 shows the product properties of the briquetted crushed carbon carbonized materials produced in examples 19 to 21. Table 3 is as follows:
TABLE 3 Table 3
It is known from examples 19 to 21 that the index of the carbonized material is optimal at 260 to 350 ℃ at the tail temperature of the carbonization furnace under the conditions that the formula of the coal is unchanged, the molding process is unchanged and the temperatures of the carbonization furnace and the furnace head are unchanged.
Example 22
Mixing weakly caking coal of a coal bed 2-2 of the Shenmu with a mass fraction of 30% with weakly caking coal of a coal bed 3-1 of the Shenmu with a mass fraction of 70%, grinding to obtain powder materials, setting the pressure of a briquetting machine to 15MPa and the current to 110A to obtain a formed material, feeding the formed material into a carbonization furnace, and measuring the strength and volatile components of the carbonized material by adjusting the temperature in the carbonization furnace and keeping the temperature of the furnace tail and the furnace head unchanged.
Example 23
Different from example 22, the temperature in the carbonization furnace is unchanged, the coal formulation is unchanged, the molding process is unchanged, the temperatures of the tail and the furnace end of the carbonization furnace are unchanged, and the strength and the volatile components of the carbonized material are measured.
Example 24
Different from example 22, the temperature in the carbonization furnace is unchanged, the coal formulation is unchanged, the molding process is unchanged, the temperatures of the tail and the furnace end of the carbonization furnace are unchanged, and the strength and the volatile components of the carbonized material are measured.
Table 4 shows the product properties of the briquetted crushed carbon carbonized materials produced in examples 22 to 24. Table 4 is as follows:
TABLE 4 Table 4
According to the embodiment 22-24, under the condition that the molding process is unchanged and the temperatures of the tail and the furnace head of the carbonization furnace are unchanged, the index of the carbonized material is optimal at the temperature of 450-500 ℃ in the carbonization furnace.
Example 25
Mixing weakly caking coal of a coal bed 2-2 of the Shenmu with a mass fraction of 30% with weakly caking coal of a coal bed 3-1 of the Shenmu with a mass fraction of 70%, grinding to obtain powder materials, setting the pressure of a briquetting machine to 15MPa and the current to 110A to obtain a formed material, feeding the formed material into a carbonization furnace, and measuring the strength and volatile matters of the carbonized material by adjusting the temperature of the furnace end of the carbonization furnace and the temperature in the furnace tail and the furnace.
Example 26
Different from example 25, the temperature of the carbonization furnace head, the formula of coal type, the molding process, the temperature of the carbonization furnace tail and the furnace are all the same, and the strength and the volatile of the carbonized material are measured.
Example 27
Different from example 25, the temperature of the carbonization furnace head, the formula of coal type, the molding process, the temperature of the carbonization furnace tail and the furnace are all the same, and the strength and the volatile of the carbonized material are measured.
Table 5 shows the product properties of the briquetted crushed carbon carbonized materials produced in examples 25 to 27. Table 5 is as follows:
TABLE 5
It is clear from examples 25 to 27 that the index of the carbonized material is optimal at 550 to 620 ℃ of the temperature of the end of the carbonization furnace under the condition that the molding process is unchanged and the temperature in the carbonization furnace is unchanged.
Example 28
Mixing weakly caking coal of a coal bed of 2-2 of the Shenmu with a mass fraction of 30% with weakly caking coal of a coal bed of 3-1 of the Shenmu with a mass fraction of 70%, grinding to obtain powder materials, setting the pressure of a briquetting machine to 15MPa, setting the current to 110A to obtain a formed material, feeding the formed material into a carbonization furnace, controlling the tail temperature of the carbonization furnace to 260-350 ℃, controlling the temperature in the furnace to 450-500 ℃, controlling the temperature of a furnace end to 550-620 ℃, and detecting indexes such as iodine value, methylene blue, molasses value, strength and the like of the crushed carbon of the finished briquettes by adjusting the activation temperature.
Example 29
Different from example 28, the activation temperature, the coal formulation, the molding process and the carbonization furnace temperature were all the same, and the iodine value, methylene blue, molasses value, strength and other indexes of the finished briquetted crushed carbon were detected.
Example 30
Different from example 28, the activation temperature, the coal formulation, the molding process and the carbonization furnace temperature were all the same, and the iodine value, methylene blue, molasses value, strength and other indexes of the finished briquetted crushed carbon were detected.
Example 31
Different from example 28, the activation temperature, the coal formulation, the molding process and the carbonization furnace temperature were all the same, and the iodine value, methylene blue, molasses value, strength and other indexes of the finished briquetted crushed carbon were detected.
Example 32
Different from example 28, the activation temperature, the coal formulation, the molding process and the carbonization furnace temperature were all the same, and the iodine value, methylene blue, molasses value, strength and other indexes of the finished briquetted crushed carbon were detected.
Table 6 shows the product properties of the briquetted crushed carbons produced in examples 28-32. Table 6 is as follows:
TABLE 6
As is clear from examples 28-32, when the activation temperature is 920-970 ℃, the prepared high-molasses briquetting broken carbon molasses has a value of >200, methylene blue of >180mg/g, iodine value of >950mg/g, roller strength of >94%, and packing density of >380g/l, and all indexes are good.
According to the data in tables 1 to 6, in the scheme, weakly caking coal of a Shenmu 2-2 coal bed and weakly caking coal of a Shenmu 3-1 coal bed are mixed, milled and molded, when the weakly caking coal of the Shenmu 2-2 coal bed is added into the mixture in a mass percentage of 20-40%, the pressure of a briquetting machine is 15-18MPa, the current is set to be 110A, the tail temperature of a carbonization furnace is 260-350 ℃, the temperature in the furnace is 450-500 ℃, the temperature of a furnace head is 550-620 ℃, and the temperature of an activation furnace is 920-970 ℃, and the prepared briquetting broken carbon is high molasses briquetting broken carbon, and the obtained product molasses value is more than 200, methylene blue is more than 180mg/g, iodine value is more than 950mg/g, roller strength is more than 94%, and the filling density is more than 380g/l. The molasses value of the pressed crushed carbon prepared by single coal is obviously lower, for example, the molasses value of the activated carbon product is less than 160, or the iodine value and the filling density are lower, for example, the molasses value of the activated carbon product is less than 950mg/g, for example, the coal bed of 2-2 coal beds of the Shenmu coal.
As the activated carbon prepared from the Shenmu 2-2 coal bed weakly caking coal has developed mesopores and total pore volume, the activated carbon prepared from the Shenmu 2-2 coal bed weakly caking coal has developed volume, large adsorption capacity and high adsorption speed compared with the activated carbon prepared from the Shenmu 3-1 coal bed weakly caking coal. However, the activated carbon prepared by only adopting 2-2 coal beds of weakly caking coal has low filling density and iodine value and higher molasses value; the activated carbon prepared by only using the weakly caking coal of the 3-1 coal bed has higher iodine value and packing density and lower molasses value. When two kinds of coal are mixed in a certain proportion, the two kinds of weakly caking coal particles can be mutually fused, the advantages of the two kinds of coal are fully exerted, and all indexes such as molasses value, methylene blue, iodine value, roller strength, filling density and the like of the prepared activated carbon are qualified, so that the coal blending of the double weakly caking coal types of the Shenmu 2-2 coal bed weakly caking coal and the 3-1 coal bed weakly caking coal can be optimized under the condition of not adding any adhesive materials and auxiliary reagents, the process parameters of briquette forming, carbonization and activation are optimized, the high molasses briquette broken carbon with all good indexes is prepared, and the problems that the briquette broken carbon prepared from a single coal is low in molasses value or the indexes of other activated carbons are not qualified are solved.
The molasses value is an important index of the decolorizing capacity of the activated carbon, and the briquetted crushed carbon obtained by adopting the scheme has the methylene blue of more than 180mg/g, the iodine value of more than 950mg/g and the drum strength of more than 94 percent, meets the requirements of the product strength, meets the first grade standard of the coal granular activated carbon for domestic water purification, has a molasses value higher than 200, and has excellent decolorizing capacity, thereby meeting the requirements of removing organic macromolecules in the industries of sugar production, pharmacy and beverage. The foregoing is merely exemplary of embodiments of the invention and, as regards devices and arrangements not explicitly described in this disclosure, it should be understood that this can be done by general purpose devices and methods known in the art.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. The high molasses briquetting broken carbon is characterized in that the initial material for preparing the Gao Tangmi briquetting broken carbon is a mixture of weakly caking coal A and weakly caking coal B; the weak sticky coal A is weak sticky coal of a coal bed of 3-1 of the Shenmu coal, and the weak sticky coal B is weak sticky coal of a coal bed of 2-2 of the Shenmu coal;
the mass percentage content of the weakly caking coal B in the initial material is 20-40%;
the fineness of the initial material meets the requirement that the sieving rate on a 325-mesh Taylor standard sieve is more than 80%;
the weakly caking coal A satisfies the following conditions: ash content less than or equal to 4.5% (wt%), volatile matter 33-38% (wt%), coke residue characteristics 3-4 type, stacking specific weight 800-900g/l;
the weakly caking coal B satisfies the following conditions: ash content less than or equal to 4.5% (wt%), volatile matter 33-38% (wt%), coke residue characteristics 3-4, and stacking ratio weight 700-780g/l.
2. The high molasses briquetting broken char of claim 1, wherein the molasses value of the Gao Tangmi briquetting broken char is greater than 200, methylene blue is greater than 180mg/g, drum strength is greater than 94%, and iodine value is greater than 950mg/g.
3. A method of producing the high molasses briquetting broken char of claim 1 or 2, comprising the steps of:
s1, mixing and grinding weakly caking coal A and weakly caking coal B to obtain a powdery initial material;
s2, carrying out extrusion molding by a briquetting machine based on the initial material to obtain a molding material;
s3, carbonizing the molding material to obtain carbonized material;
s4, activating treatment is carried out based on the carbonized material to obtain the Gao Tangmi briquetting broken carbon.
4. A method according to claim 3, wherein the Gao Tangmi briquette crushed char has a molasses value of greater than 200.
5. A method according to claim 3, wherein the Gao Tangmi briquette crushed charcoal methylene blue is greater than 180mg/g.
6. A method according to claim 3, wherein the Gao Tangmi briquette crushed carbon has a drum strength of greater than 94%.
7. The method of claim 4, wherein the Gao Tangmi briquette crushed carbon has an iodine value of greater than 950mg/g.
8. The method of claim 7, wherein the forming stock has a roller strength of greater than 85%.
9. The method according to any one of claims 3 to 6, wherein in the step S3 of obtaining a carbonized material based on the shaped material, the shaped material is carbonized in a carbonization furnace to obtain the carbonized material after carbonization treatment;
the temperature of the tail of the carbonization furnace is controlled to be 260-350 ℃, the temperature in the furnace is controlled to be 450-500 ℃, and the temperature of the furnace head is controlled to be 550-620 ℃;
the power of the transmission motor of the carbonization furnace is 11KW, and the frequency is set at 20-26 Hz.
10. The method according to claim 8, wherein in step S4, in the step of obtaining the Gao Tangmi briquetted crushed carbon by performing an activation treatment based on the carbonized material, the activators used are steam and flue gas.
11. The method according to claim 9, wherein in the step S4 of obtaining the Gao Tangmi briquette crushed carbon by performing an activation treatment based on the carbonized material, the carbonized material is subjected to an activation treatment in an activation furnace to obtain the Gao Tangmi briquette crushed carbon;
the activation furnace includes: the device comprises a preheating section, a supplementary carbonization section, an activation section, a first cooling section, a second cooling section, an upper connecting flue, a lower connecting flue and a regenerator;
the activation section is provided with a fifth point location, a sixth point location, a seventh point location and an eighth point location for controlling temperature.
12. The method of claim 11, wherein the control temperatures of the fifth, sixth, seventh, and eighth points are: 920-970 ℃.
13. The method of claim 11, wherein the activation furnace steam pressure is 0.35-0.5MPa and steam flow is 1.5-3.0m 3 And/h, air flow rate is 500-700m 3 And/h, the furnace pressure is 55-95Pa, and the pumping force is 120-160 Pa.
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