CN113511919A - Carbon block green body surface coating and using method and preparation method thereof - Google Patents

Carbon block green body surface coating and using method and preparation method thereof Download PDF

Info

Publication number
CN113511919A
CN113511919A CN202110770640.0A CN202110770640A CN113511919A CN 113511919 A CN113511919 A CN 113511919A CN 202110770640 A CN202110770640 A CN 202110770640A CN 113511919 A CN113511919 A CN 113511919A
Authority
CN
China
Prior art keywords
carbon block
coating
binder
weight
carbon source
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202110770640.0A
Other languages
Chinese (zh)
Other versions
CN113511919B (en
Inventor
陈石林
陈显辉
梁正
罗高强
黄海燕
梁玉林
韦德斌
宋振宇
李永锋
韦联生
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangxi Qiangqiang Carbon Co ltd
Hunan University
Original Assignee
Guangxi Qiangqiang Carbon Co ltd
Hunan University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangxi Qiangqiang Carbon Co ltd, Hunan University filed Critical Guangxi Qiangqiang Carbon Co ltd
Priority to CN202110770640.0A priority Critical patent/CN113511919B/en
Publication of CN113511919A publication Critical patent/CN113511919A/en
Application granted granted Critical
Publication of CN113511919B publication Critical patent/CN113511919B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
    • C04B41/5024—Silicates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
    • C04B41/5001—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with carbon or carbonisable materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
    • C04B41/5025—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with ceramic materials
    • C04B41/5037—Clay, Kaolin
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
    • C04B41/81—Coating or impregnation
    • C04B41/85—Coating or impregnation with inorganic materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
    • C04B41/81—Coating or impregnation
    • C04B41/85—Coating or impregnation with inorganic materials
    • C04B41/87—Ceramics
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Paints Or Removers (AREA)

Abstract

The invention discloses a carbon block green body surface coating and a using method and a preparation method thereof, and the adopted technical scheme is as follows: taking silicate minerals, namely sepiolite, bentonite, kaolin, pyrophyllite and the like as base materials, wood powder, straw powder, wheat bran, rice bran and the like as structure regulators, and polyvinyl alcohol, vinyl acetate, acrylic acid, polyurethane and starch as binders, and preparing a coating for producing a green carbon block surface coating; the method has the advantages that after the surface coating of the green carbon block is roasted, the surface of the carbon block forms a loose porous structure, and the interface bonding strength of the pitch coke and the carbon block is greatly reduced, so that the surface cleaning efficiency of the roasted carbon block is improved, the production cost is reduced, and the mechanized surface cleaning of the carbon block is convenient to realize.

Description

Carbon block green body surface coating and using method and preparation method thereof
Technical Field
The invention relates to the technical field of carbon block green body surface coatings for carbon materials, in particular to a carbon block green body surface coating and a using method and a preparation method thereof.
Background
The carbon material generally takes calcined petroleum coke, graphite powder and the like as aggregates and coal pitch as a binder, and the preparation process flow is as follows: material preparation, kneading, molding, roasting and graphitization; during the roasting process of the molded green body, when the roasting temperature is 150-300 ℃, the viscosity of the coal pitch is rapidly reduced, the pyrolysis polycondensation reaction of the coal pitch is not started, the coal pitch is rapidly converted into a liquid state from a glass state, and the liquid pitch diffuses and migrates to the surface of the anode carbon block along the gap of the solid carbonaceous material under the action of gravity and thermal expansion; the coal tar pitch migration phenomenon generated in the carbon blank during roasting is not the integral migration of the paste, but the coal tar pitch selective migration, wherein the light components in the coal tar pitch preferentially migrate; the coal tar pitch and metallurgical coke filler on the surface of the carbon block are chemically adsorbed, and along with the roasting process, the coal tar pitch on the surface of the carbon block, which adsorbs the metallurgical coke filler, is solidified into coke on the surface of the carbon block, and the interface bonding strength is high.
In the roasting process of the green carbon block, the weight loss rate of the coal pitch is maximum within the temperature range of 350-550 ℃, the coal pitch is violently decomposed at the stage, so that a large amount of volatile components escape, and then the coal pitch is mainly subjected to polycondensation reaction; the escaped part of volatile matter is adsorbed by the metallurgical coke filler on the surface of the carbon block and is solidified into coke on the surface of the carbon block, and the interface bonding strength is high.
At present, the interface bonding strength of the pitch coke and the carbon block is very high, so that the manual cleaning of the surface of the roasted carbon block is quite difficult: the working strength is high, the efficiency is low, and the cost is high; mechanical cleaning is tried by some enterprises, but the bonding strength of the interface of the pitch coke and the carbon block is high, so that the damage rate of the metal blade for cleaning is high, the motor is burnt in severe cases, and the equipment needs to be maintained frequently. The cost of the mechanical cleaning mode is high, and meanwhile, the mechanical cleaning mode seriously damages the surface of the carbon block, so that the chemical reactivity of the carbon block is increased.
Disclosure of Invention
Based on the problems in the prior art, the invention aims to prepare the coating for the surface coating of the green body of the carbon block; the coating is evenly coated on the surface of the green carbon block to form a coating, and the coating on the surface of the green carbon block is roasted to form a loose porous structure, so that the interface bonding strength of the pitch coke and the carbon block is greatly reduced.
In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:
1. a surface paint for the green carbon block is prepared from silicate mineral, biologic carbon source, adhesive and H2O; the weight ratio of the silicate mineral, the biological carbon source and the binder is as follows: 5% -50%: 48% -94%: 0.2% -2.0%; taking the total weight of the silicate mineral, the biological carbon source and the binder as the weight of solid, and obtaining H according to the weight of the solid2Amount of O, weight of solid, H2The weight ratio of O is: 10% -30%: 70 to 90 percent.
2. A preparation method of a carbon block green body surface coating comprises the following steps:
s1, respectively weighing and obtaining a silicate mineral, a biological carbon source and a binder; the weight ratio of the silicate mineral to the biological carbon source to the binder is as follows: 5% -50%: 48% -94%: 0.2% -2.0%; mixing the silicate mineral and the biological carbon source according to the weight ratio to obtain a mixture of the silicate mineral and the biological carbon source;
s2, taking the total weight of the silicate mineral, the biological carbon source and the binder as the weightWeight of solids, based on the weight of solids, H2The amount of O, the weight of solids and H2The weight ratio of O is: 10% -30%: 70% -90%; subjecting said H to2Mixing the O and the binder according to the weight ratio to prepare a binder aqueous solution, adding the binder aqueous solution into the mixture of the silicate mineral and the biological carbon source, and fully stirring for 15-30min to prepare the coating for generating the surface coating of the green carbon block.
3. A carbon block green body surface coating comprises the following steps:
step one, respectively weighing and obtaining silicate minerals, a biological carbon source and a binder; the weight ratio of the silicate mineral to the biological carbon source to the binder is as follows: 5% -50%: 48% -94%: 0.2% -2.0%; taking the total weight of the silicate mineral, the biological carbon source and the binder as the weight of solid, and obtaining H according to the weight of the solid2The amount of O, the weight of solids and H2The weight ratio of O is: 10% -30%: 70% -90%; mixing silicate mineral and biological carbon source according to weight ratio to obtain mixture of silicate mineral and biological carbon source, and mixing with H2Mixing the O and the binder according to the weight ratio to obtain a binder aqueous solution, adding the binder aqueous solution into the mixture of the silicate mineral and the biological carbon source, fully stirring for 15-30min to prepare a coating for generating a surface coating of a green carbon block blank, and uniformly coating the coating on the surface of the green carbon block blank to be roasted;
step two, removing H contained in the coating2O；
Step three, roasting the carbon block green body coated with the coating on the surface;
and step four, cleaning pitch coke on the surface of the carbon block after the green carbon block is roasted.
As a preferable mode of the above aspect, the layered silicate mineral base material has a crystal structure in which each structural unit layer is composed of two (Si-O) tetrahedral layers sandwiched by one (Al-O, OH) octahedral layer; the material has good chemical inertness, a lamellar structure and a large specific surface area; the material has strong hygroscopicity and expansibility, can adsorb water with volume being 8-15 times of that of the material, and has volume expansion being several times to 30 times; the adsorption capacity for various gases, liquids and organic substances is certain, and the maximum adsorption capacity can reach 5 times of the self weight; in the roasting process, the matrix material is beneficial to adsorbing, diffusing and transferring coal tar and volatile components thereof on the surface of the carbon block green body by the carbon block green body coating, carbonizing the coal tar and the volatile components into loose and porous asphalt coke, and greatly reducing the interface bonding strength of the asphalt coke and the carbon block.
As one of the preferable schemes of the scheme, the silicate matrix material can be dispersed into a gelatinous state and a suspended state in an aqueous medium, and the medium solution has certain viscosity, thixotropy and lubricity; the base material is beneficial to improving the rheological property of the prepared coating, and improving the suspension dispersion of the base material and the structure adjusting material in water; thereby being beneficial to controlling the thickness of the green coating of the carbon block.
As one of preferable embodiments of the above, the base material of the coating material contains at least one of the following substances: sepiolite, bentonite, kaolin, pyrophyllite, and the like; 5 to 75 percent by weight, preferably 5 to 50 percent by weight.
As one of the preferred embodiments of the above, the particle size of the matrix material has an important influence on the suspension stability, rheology and coating porosity of the prepared coating; the large granularity of the matrix material causes the matrix material to settle and delaminate in the prepared coating, reduces the suspension stability of the prepared coating, and has poor rheological property, thereby influencing the uniformity of the green coating of the carbon block; the small particle size of the matrix material causes the porosity of the carbon block green body coating to be reduced, thereby influencing the adsorption of the coal tar pitch and volatile components thereof which are diffused and migrated to the surface of the carbon block green body during the roasting process of the carbon block green body coating.
As one of the preferable modes of the above mode, the particle size of the base material of the coating is 18 to 48 μm, preferably 10 to 35 μm.
As one preferable embodiment of the above embodiment, the structure-adjusting material is a biomass charcoal source: wood powder, straw powder, wheat bran, rice bran and the like are carbonized at the weight loss temperature of 250 ℃ and 350 ℃ in the roasting process and are carbonized into loose and porous activated carbon; in the roasting process of the coal tar pitch, the discharge temperature of a large amount of volatile components is 350-550 ℃, the active carbon with a loose and porous structure adsorbs the volatile components discharged by the coal tar pitch, and the asphalt components adsorbed on the surface of the active carbon are carbonized into loose and porous asphalt coke, so that the interface bonding strength of the asphalt coke and the carbon block is greatly reduced.
As one preferable mode of the above-mentioned mode, the structure-regulating material contains at least one of the following substances: wood flour, straw powder, wheat bran, rice bran and the like. 25-94% by weight, preferably 48-94% by weight.
As one of the preferable schemes of the scheme, the granularity of wood powder, straw powder, wheat bran, rice bran and the like which are used as the structure adjusting materials has an important influence on the specific surface area after carbonization, so that the adsorption, diffusion and migration of coal tar and volatile components on the surface of the carbon block green body coating are influenced.
As one of the preferable embodiments of the above-mentioned means, the particle size of the structure-adjusting material of the coating is 74 to 560. mu.m, preferably 180 to 250. mu.m.
As one of preferable modes of the above modes, the binders such as polyvinyl alcohol, vinyl acetate, acrylic acid, polyurethane, starch and the like belong to water-soluble surfactants, so that on one hand, the suspension stability and the dispersibility of the matrix material and the structure regulator in the coating are improved; on the other hand, the binder has cohesiveness, so that the coating generated by the surface coating of the green carbon block has proper cohesive strength with the surface of the green carbon block.
As one preferable mode of the above mode, the binder contains at least one of the following substances: polyvinyl alcohol, vinyl acetate, acrylic acid, polyurethane, starch, and the like. 0.1 to 5.0 percent by weight, preferably 0.2 to 2.0 percent by weight.
As one of the preferred solutions, the concentration of the coating used to create the green carbon block coating has a significant impact on its suspension stability and rheology; the coating has high concentration, high viscosity, good suspension stability and poor rheological property. The thickness of the coating on the surface of the green carbon block is increased, the uniformity of the coating is poor, and the volatile resistance discharged by coal tar pitch in the roasting process is large, so that a large number of cracks are generated after the carbon block is roasted, and the quality of the carbon block product is influenced; the concentration of the coating is small, the viscosity of the coating is small, the suspension stability is poor, and the rheology of the coating is good; the thickness of the coating on the green body surface of the carbon block is thin, the uniformity of the coating is poor, a large amount of volatile components discharged in the roasting process of the coal tar pitch can not be effectively adsorbed, so that the escaped volatile components are adsorbed by the metallurgical coke filler on the surface of the carbon block and are solidified into coke on the surface of the carbon block, and the interface bonding strength is high, so that the carbon block is difficult to clean.
As one of the preferable schemes of the scheme, the preparation method of the coating for generating the surface coating of the green carbon block comprises the following components in percentage by weight: 5% -60%, H2O: 40% to 95%, preferably 10% to 30%, H2O: 70 to 90 percent.
As one of the preferable schemes of the scheme, the preparation method of the coating for generating the surface coating of the green carbon block has the viscosity of 200-3500 mPa.s, preferably 400-600 mPa.s.
The coating for generating the surface coating of the green carbon block is coated on the surface of the green carbon block by blade coating, spray coating, flow coating, dip coating and other methods, and the surface coating of the green carbon block forms a loose porous structure after being roasted.
Compared with the prior art, the invention has the advantages that:
the surface coating of the green carbon block can greatly reduce the interface bonding strength of the pitch coke and the carbon block, thereby improving the surface cleaning efficiency of the roasted carbon block, reducing the production cost and being convenient for realizing the mechanical surface cleaning of the carbon block. In addition, the coating for generating the surface coating of the green carbon block is low in cost and simple in preparation process.
Drawings
FIG. 1 is a graph of coal pitch TG;
FIG. 2 is a graph of TG of a structure tuning material;
FIG. 3 is an SEM (a) view of the carbon block and coating interface of the dip coating of example 1;
FIG. 4 is SEM (b) image of the carbon block and coating interface of dip coating of example 2;
FIG. 5 is SEM (c) view of the carbon block and coating interface of the dip coating of example 3;
FIG. 6 is SEM (d) chart of carbon block and coating interface of dip coating of example 4;
FIG. 7 is an SEM (e) view of the carbon block and coating interface of the dip coating of example 5;
FIG. 8 is an SEM (f) view of the carbon block and coating interface of the dip coating of example 6;
FIG. 9 is SEM (g) image of carbon block and coating interface without dip coating;
FIG. 10 is a graph of carbon block washcoat firing.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined purpose, the following detailed description of the carbon block green body surface coating and the using method and preparation method thereof according to the present invention with reference to the accompanying drawings and preferred examples is as follows:
example 1
The paint for generating the surface coating of the green carbon block of the first embodiment of the invention comprises the following components in percentage by weight: 50.0% of sepiolite, 48.0% of wood powder and 2.0% of polyvinyl alcohol. Preparing the coating into 10.0% of coating, and weighing 90.0% of water according to the weight of the 10.0% of coating;
the sepiolite particle size in the coating for producing the carbon block green body surface coating of the first embodiment of the invention is 10-35 μm, and the wood flour particle size is 180-250 μm.
The preparation method comprises the following steps:
1. preparing the polyvinyl alcohol into aqueous solution according to the weight ratio;
2. adding sepiolite and wood powder into a polyvinyl alcohol aqueous solution according to the weight ratio, and fully stirring for 15-30min to prepare a coating on the surface of the carbon block green body;
3. dip-coating the carbon block green body in the prepared coating, taking out and naturally drying;
4. roasting and carbonizing the green carbon block with the dip-coating in a muffle furnace;
SEM analysis is carried out on the carbonized carbon block, the combination state of the carbon block and the coating interface is observed as shown in figure 3, and the difficulty degree of cleaning the surface of the carbonized carbon block after dip coating is observed; the results are shown in Table 1.
Example 2
The paint for generating the surface coating of the green carbon block of the second embodiment of the invention comprises the following components in percentage by weight: 50.0% of bentonite, 48.0% of wheat bran and 2.0% of vinyl acetate. And formulated as a 10.0% paint weighing 90.0% water by weight based on 10.0% paint weight.
The bentonite particle size in the coating for generating the carbon block green body surface coating of the second embodiment of the invention is 10-35 μm, and the wood powder particle size is 180-250 μm;
the preparation is as in example 1; SEM analysis is carried out on the carbonized carbon block, the combination state of the carbon block and the coating interface is observed as shown in figure 4, and the difficulty degree of cleaning the surface of the carbonized carbon block after dip coating is observed; the results are shown in Table 1.
Example 3
The paint for generating the surface coating of the green carbon block of the third embodiment of the invention comprises the following components in percentage by weight: 5.0 percent of kaolin, 94.0 percent of straw powder and 0.2 percent of acrylic acid; preparing the coating into 30.0% of coating, and weighing 70.0% of water according to the weight of the coating of 30.0%;
the sepiolite particle size in the coating for generating the carbon block green body surface coating in the third embodiment of the invention is 10-35 μm, and the straw powder particle size is 180-250 μm;
the preparation is as in example 1; SEM analysis is carried out on the carbonized carbon block, the bonding state of the carbon block and the coating interface is observed as shown in figure 5, and the difficulty degree of cleaning the surface of the carbonized carbon block after dip coating is observed; the results are shown in Table 1.
Example 4
The paint for generating the surface coating of the green carbon block of the fourth embodiment of the invention comprises the following components in percentage by weight: 5.0% of pyrophyllite, 94.0% of wood powder and 0.2% of starch; preparing the coating into 30.0% of coating, and weighing 70.0% of water according to the weight of the coating of 30.0%;
the sepiolite granularity in the coating used for generating the carbon block green body surface coating of the four embodiments of the invention is 10-35 μm, and the wood flour granularity is 180-250 μm;
the preparation is as in example 1; SEM analysis is carried out on the carbonized carbon block, the bonding state of the carbon block and the coating interface is observed as shown in figure 6, and the difficulty degree of cleaning the surface of the carbonized carbon block after dip coating is observed; the results are shown in Table 1.
Example 5
The paint for generating the surface coating of the green carbon block of the fifth embodiment of the invention comprises the following components in percentage by weight: 5.0% of sepiolite, 94.0% of rice bran and 0.2% of polyurethane; preparing the coating into 30.0% of coating, and weighing 70.0% of water according to the weight of the coating of 30.0%;
the sepiolite granularity in the coating used for generating the carbon block green body surface coating in the five embodiments of the invention is 10-35 μm, and the wood flour granularity is 180-250 μm;
the preparation is as in example 1; SEM analysis is carried out on the carbonized carbon block, the combination state of the carbon block and the coating interface is observed as shown in figure 7, and the difficulty degree of cleaning the surface of the carbonized carbon block after dip coating is observed; the results are shown in Table 1.
Example 6
The paint for generating the surface coating of the green carbon block of the first embodiment of the invention comprises the following components in percentage by weight: 5.0% of sepiolite, 94.0% of wood powder and 0.2% of polyvinyl alcohol; preparing the coating into 30.0% of coating, and weighing 70.0% of water according to the weight of the coating of 30.0%;
the sepiolite particle size in the coating for generating the carbon block green body surface coating of the first embodiment of the invention is 10-35 μm, and the wood powder particle size is 180-250 μm;
the preparation is as in example 1; SEM analysis is carried out on the carbonized carbon block, the bonding state of the carbon block and the coating interface is observed as shown in figure 8, and the difficulty degree of cleaning the surface of the carbonized carbon block after dip coating is observed; the results are shown in Table 1.
TABLE 1
Figure BDA0003153130980000101
Example 7
According to the carbon block coating firing graph shown in fig. 10, the temperature rise rate during firing of the green carbon block is controlled in multiple stages, the first stage is: the temperature rise rate of 0-200 ℃ is 3.33 ℃/min, and the second stage is as follows: the temperature rise rate at 200 ℃ and 400 ℃ is 0.83 ℃/min, and the third stage is as follows: the temperature rise rate at 400 ℃ and 600 ℃ is 0.42 ℃/min, and the fourth stage is as follows: the temperature rise rate of 600-.
According to the TG curve diagram of coal tar pitch shown in FIG. 1, when the roasting temperature is 350-.
According to the TG curve chart of the structure adjusting material shown in figure 2, when the roasting temperature is 250-350 ℃, the structure adjusting material is carbonized into the activated carbon with a loose and porous structure, the activated carbon with the loose and porous structure adsorbs volatile components discharged by coal tar pitch, and the asphalt component adsorbed on the surface of the activated carbon is carbonized into loose and porous asphalt coke, so that the interface bonding strength of the asphalt coke and the carbon block is greatly reduced.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention in any way, and any simple modification, equivalent change and modification made by those skilled in the art according to the technical spirit of the present invention are still within the technical scope of the present invention without departing from the technical scope of the present invention.

Claims (9)

1. The carbon block green body surface coating is characterized by comprising silicate minerals, a biological carbon source, a binder and H2O; the weight ratio of the silicate mineral to the biological carbon source to the binder is as follows: 5% -50%: 48% -94%: 0.2% -2.0%; taking the total weight of the silicate mineral, the biological carbon source and the binder as the weight of solid, and obtaining H according to the weight of the solid2Amount of O, weight of said solids, H2The weight ratio of O is: 10% -30%: 70 to 90 percent.
2. The carbon block green body facecoat of claim 1, wherein the silicate mineral is a matrix material, the matrix material being: one of sepiolite, bentonite, kaolin and pyrophyllite.
3. The carbon block green body surface coating of claim 1, wherein the bio-based carbon source is a structural adjustment material, the structural adjustment material being: wood powder, straw powder, wheat bran, and rice bran.
4. The carbon block green body facecoat of claim 1, wherein the binder is: polyvinyl alcohol, vinyl acetate, acrylic acid, polyurethane and starch.
5. A preparation method of a carbon block green body surface coating is characterized by comprising the following steps:
s1, respectively weighing and obtaining a silicate mineral, a biological carbon source and a binder; the weight ratio of the silicate mineral to the biological carbon source to the binder is as follows: 5% -50%: 48% -94%: 0.2% -2.0%; mixing the silicate mineral and the biological carbon source according to a weight ratio to obtain a mixture of the silicate mineral and the biological carbon source;
s2, taking the total weight of the silicate mineral, the biological carbon source and the binder as the weight of solid, and obtaining H according to the weight of the solid2The amount of O, the weight of solids and H2The weight ratio of O is: 10% -30%: 70% -90%; subjecting said H to2Mixing the O and the binder according to the weight ratio to prepare a binder aqueous solution, adding the binder aqueous solution into the mixture of the silicate mineral and the biological carbon source, and fully stirring for 15-30min to prepare the coating for generating the surface coating of the green carbon block.
6. The method of making a carbon block green body facecoat as in claim 5, wherein the silicate mineral particle size is 10-35 μm.
7. The method for preparing carbon block green body surface coating of claim 5, wherein the particle size of the bio-made carbon source is 180-250 μm.
8. The method for using the surface coating of the green body of the carbon block is characterized by comprising the following steps of:
step one, respectively weighing and obtaining silicate minerals, a biological carbon source and a binder; the weight ratio of the silicate mineral to the biological carbon source to the binder is as follows: 5% -50%: 48% -94%: 0.2% -2.0%; taking the total weight of the silicate mineral, the biological carbon source and the binder as the weight of solid, and obtaining H according to the weight of the solid2The amount of O, the weight of solids and H2The weight ratio of O is: 10% -30%: 70% -90%; mixing the silicate mineral and the biological carbon source according to the weight ratio to obtain a mixture of the silicate mineral and the biological carbon source, and mixing the H2Mixing O and a binder according to a weight ratio to obtain a binder aqueous solution, adding the binder aqueous solution into the mixture of the silicate mineral and the biological carbon source, fully stirring for 15-30min to prepare a coating for generating a surface coating of a green carbon block blank, and uniformly coating the coating on the surface of the green carbon block blank to be roasted;
step two, removing H contained in the surface coating2O；
Step three, roasting the carbon block green body coated with the coating on the surface;
and step four, cleaning pitch coke on the surface of the carbon block after the green carbon block is roasted.
9. The carbon block green body surface coating as claimed in claim 8, and the use method and preparation method thereof, wherein H contained in the coating is removed in the second step2The mode of O is natural air drying.
CN202110770640.0A 2021-07-08 2021-07-08 Carbon block green body surface coating and using method and preparation method thereof Active CN113511919B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110770640.0A CN113511919B (en) 2021-07-08 2021-07-08 Carbon block green body surface coating and using method and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110770640.0A CN113511919B (en) 2021-07-08 2021-07-08 Carbon block green body surface coating and using method and preparation method thereof

Publications (2)

Publication Number Publication Date
CN113511919A true CN113511919A (en) 2021-10-19
CN113511919B CN113511919B (en) 2022-09-09

Family

ID=78066989

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110770640.0A Active CN113511919B (en) 2021-07-08 2021-07-08 Carbon block green body surface coating and using method and preparation method thereof

Country Status (1)

Country Link
CN (1) CN113511919B (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5540950A (en) * 1986-10-09 1996-07-30 Sumitomo Osaka Cement Co., Ltd. Composite of silicon carbide and carbon and method of making the same
CN101914786A (en) * 2010-07-05 2010-12-15 广西师范大学 Titanium boride cathode coating paste for aluminum electrolysis, preparation method and coating method thereof
CN103056118A (en) * 2013-01-21 2013-04-24 广西强强碳素股份有限公司 Full-automatic slotting and cleaning unit for prebaked anode carbon blocks
CN106757161A (en) * 2016-12-01 2017-05-31 山东南山铝业股份有限公司 Modified prebaked anode and preparation method thereof
CN107574459A (en) * 2017-10-30 2018-01-12 湖南博溥立材料科技有限公司 A kind of processing method of aluminium cell Anodic carbon block

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5540950A (en) * 1986-10-09 1996-07-30 Sumitomo Osaka Cement Co., Ltd. Composite of silicon carbide and carbon and method of making the same
CN101914786A (en) * 2010-07-05 2010-12-15 广西师范大学 Titanium boride cathode coating paste for aluminum electrolysis, preparation method and coating method thereof
CN103056118A (en) * 2013-01-21 2013-04-24 广西强强碳素股份有限公司 Full-automatic slotting and cleaning unit for prebaked anode carbon blocks
CN106757161A (en) * 2016-12-01 2017-05-31 山东南山铝业股份有限公司 Modified prebaked anode and preparation method thereof
CN107574459A (en) * 2017-10-30 2018-01-12 湖南博溥立材料科技有限公司 A kind of processing method of aluminium cell Anodic carbon block

Also Published As

Publication number Publication date
CN113511919B (en) 2022-09-09

Similar Documents

Publication Publication Date Title
KR101679883B1 (en) Method for making porous acicular mullite bodies
RU2500456C1 (en) Smelt filter and method of its production
CN108865195B (en) Method for preparing high-strength carbon material from biomass
CN112876283B (en) Porous ceramic matrix and atomizing core with oil storage and locking functions
CN109824381B (en) Silicon carbide ceramic membrane and preparation method and application thereof
CN112778020B (en) High-temperature porous ceramic and preparation method thereof
CN108017409B (en) Low-temperature sintered silicon carbide honeycomb ceramic material and preparation method thereof
CN115872744B (en) Method for preparing high-performance binder-free carbon graphite material by solid-phase densification
CN110127694A (en) A kind of preparation method of asphalt based active carbon
CN114645449B (en) Preparation method of polyimide resin carbon modified C/C-SiC friction material
CN114044515A (en) Preparation method of desulfurization and denitrification activated carbon
CN113511919B (en) Carbon block green body surface coating and using method and preparation method thereof
CN109192524A (en) A kind of active carbon-graphene composite porous material preparation method
CN1762905A (en) A kind of preparation method of charcoal material surface gradient coating for resisting oxidation
CN111841494A (en) Active carbon for air purification
CN106590794A (en) Barbecue charcoal production method
KR20150042789A (en) Method of preparing high porosity ceramic material
CN115584148A (en) High-heat-conductivity high-strength composite material for flexibility transformation of circulating fluidized bed boiler and preparation method thereof
CN105590661B (en) Electrode paste and preparation method thereof
CN114590806A (en) Efficient and energy-saving preparation method based on artificial graphite powder of rotary kiln
CN111359602B (en) Solid acid catalyst, foam structure carbon material and preparation method
US2682686A (en) Carbon bodies and method of manufacturing the same
CN1189453A (en) Petroleum asphalt based active carbon and its prepn. method
CN101289330A (en) Method for preparing porous charcoal-ceramic composite material
CN113903916A (en) Application of coupling agent in granulation process of lithium battery negative electrode material and granulation process of lithium battery negative electrode material

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant