CN114525161B - Coke passivating agent and preparation method thereof - Google Patents
Coke passivating agent and preparation method thereof Download PDFInfo
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- CN114525161B CN114525161B CN202210274666.0A CN202210274666A CN114525161B CN 114525161 B CN114525161 B CN 114525161B CN 202210274666 A CN202210274666 A CN 202210274666A CN 114525161 B CN114525161 B CN 114525161B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L9/00—Treating solid fuels to improve their combustion
- C10L9/10—Treating solid fuels to improve their combustion by using additives
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L10/00—Use of additives to fuels or fires for particular purposes
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L10/00—Use of additives to fuels or fires for particular purposes
- C10L10/14—Use of additives to fuels or fires for particular purposes for improving low temperature properties
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/007—Conditions of the cokes or characterised by the cokes used
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2200/00—Components of fuel compositions
- C10L2200/02—Inorganic or organic compounds containing atoms other than C, H or O, e.g. organic compounds containing heteroatoms or metal organic complexes
- C10L2200/0204—Metals or alloys
- C10L2200/0213—Group II metals: Be, Mg, Ca, Sr, Ba, Ra, Zn, Cd, Hg
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2200/00—Components of fuel compositions
- C10L2200/02—Inorganic or organic compounds containing atoms other than C, H or O, e.g. organic compounds containing heteroatoms or metal organic complexes
- C10L2200/0204—Metals or alloys
- C10L2200/0218—Group III metals: Sc, Y, Al, Ga, In, Tl
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2200/00—Components of fuel compositions
- C10L2200/02—Inorganic or organic compounds containing atoms other than C, H or O, e.g. organic compounds containing heteroatoms or metal organic complexes
- C10L2200/0268—Phosphor containing compounds
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2200/00—Components of fuel compositions
- C10L2200/02—Inorganic or organic compounds containing atoms other than C, H or O, e.g. organic compounds containing heteroatoms or metal organic complexes
- C10L2200/0272—Silicon containing compounds
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2200/00—Components of fuel compositions
- C10L2200/02—Inorganic or organic compounds containing atoms other than C, H or O, e.g. organic compounds containing heteroatoms or metal organic complexes
- C10L2200/029—Salts, such as carbonates, oxides, hydroxides, percompounds, e.g. peroxides, perborates, nitrates, nitrites, sulfates, and silicates
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2200/00—Components of fuel compositions
- C10L2200/04—Organic compounds
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention relates to the technical field of coke production aids, in particular to a coke passivating agent and a preparation process thereof. The coke passivating agent comprises the following components in parts by weight: 30-40 parts of boron-containing compound, 10-15 parts of silicon dioxide, 5-10 parts of titanium dioxide, 3-5 parts of calcium carbonate, 3-5 parts of calcium phosphate and 1-3 parts of lanthanum chloride, wherein the boron-containing compound comprises boric acid, borax and boron oxide, and the boric acid is prepared from the following components in percentage by weight: borax: boron oxide = 1:1-3:1-3. The beneficial effects of the invention are as follows: the coke passivating agent can obviously reduce the reactivity of coke and improve the strength after reaction.
Description
Technical Field
The invention belongs to the technical field of coke production aids, and particularly relates to a coke passivating agent and a preparation method thereof.
Background
Coke is a solid fuel formed by pyrolysis, polycondensation, solidification, shrinkage and other complex physical and chemical processes of coking coal under the action of high-temperature carbonization. The carbon content is above 96%, and the heat value is 29 multiplied by 103kJ/kg. The coke is mainly used for blast furnace iron making and blast furnace smelting of nonferrous metals such as copper, lead, zinc, titanium, antimony, mercury and the like, and plays roles of a reducing agent, a heating agent and a material column framework. In the performance index of coke, the reactivity and the strength after reaction of the coke are more and more important for blast furnace ironmaking. At present, the coke passivating agent can reduce the reactivity of the coke and improve the strength of the coke after reaction.
Chinese patent publication No. CN101654634a discloses a coke passivating agent. The coke passivating agent comprises the following raw materials in parts by weight: 1-16 parts of glucose or calcium chloride, 1-45 parts of boric anhydride, 1-15 parts of titanium dioxide, 1-10 parts of silicon dioxide, 1-45 parts of anhydrous borax, 1-46 parts of calcium borate and 1-30 parts of barium metaborate. The coke passivating agent can improve the thermal performance of the coke, inhibit the dissolution loss reaction of the coke, reduce the reactivity of the coke, increase the thermal strength of the coke, optimize the carbon morphology and reduce the fragmentation of the coke after being charged into a furnace.
Based on this, the present inventors have desired to provide another coke passivating agent capable of reducing the reactivity of coke and improving the strength after the reaction.
Disclosure of Invention
The invention aims to provide a coke passivating agent which can obviously reduce the reactivity of coke and improve the strength after reaction. The above object of the present invention is achieved by the following technical solutions:
a coke passivating agent comprises the following components in parts by weight:
30-40 parts of boron-containing compound
10-15 parts of silicon dioxide
Titanium dioxide 5-10 parts
3-5 parts of calcium carbonate
1-3 parts of calcium phosphate
Lanthanum chloride 0.5-1 parts
The boron-containing compound comprises boric acid, borax and boron oxide, wherein the weight ratio of the boric acid to the borax to the boron oxide is 1:1-3:1-3.
Further, the coke passivating agent also comprises 20-30 parts of high magnesium powder according to parts by weight.
Further, the coke passivating agent also comprises 5-10 parts of silicon aluminum powder and 5-10 parts of silicon calcium powder according to the parts by weight.
Further, the coke passivating agent also comprises 1-5 parts of fructose according to parts by weight.
Further, the coke passivating agent comprises 1-3 parts of triethanolamine by weight.
The invention also aims to provide a preparation process of the coke passivating agent, which comprises the following steps:
step one: mixing boric acid, borax and boric oxide according to the weight ratio of boric acid to borax to boric oxide=1:1-3:1-3 to obtain a boron-containing compound;
step two: according to the weight portions, weighing 30-40 portions of boron-containing compound, 10-15 portions of silicon dioxide, 5-10 portions of titanium dioxide, 3-5 portions of calcium carbonate, 1-3 portions of calcium phosphate, 0.5-1 portion of lanthanum chloride, 20-30 portions of high magnesium powder, 5-10 portions of silicon aluminum powder, 5-10 portions of silicon calcium powder, 1-5 portions of fructose and 1-3 portions of triethanolamine, and uniformly mixing.
In summary, the invention has the following beneficial effects:
1. boric acid and boric acid radical in borax can be combined with carbon atoms around the crystal lattice under the condition of no water gas, so that the total amount of active sites such as edge carbon atoms and the like is reduced; boron intercalates between the layers of graphite crystals in the form of compounds in the coke, forming substitutional solid solutions in the carbon; boric acid and borax are covered on the surface of coke to play a role of a protective film; boron is a nonmetallic element, has the reaction performance of common nonmetallic elements, and in most cases, receives electrons, and forms electronegative ions on the surface of coke, so that the chemical adsorption potential of oxygen is increased, the reaction of oxygen on carbon is blocked, and the generation of CO is inhibited; when boric acid is heated to 1100 ℃ along with coke, partial dehydration is carried out to obtain metaboric acid HBO 2 Further dehydrating to obtain B 2 O 3 ，B 2 O 3 Is typically an acidic substance. Due to the dehydration of acidic substances by heating, in B 2 O 3 The surface forms B-O-B bonds. B is an electron-deficient body, has electrophilic tendency, and is easy to occur on the defect site of the coke surface due to the dissolution reaction of coke. The presence of a large number of carbon arc pairs on these surface defect sites causes the B-O-B bonds to readily aggregate toward lone pairs, thereby blocking the active sites upon which the dissolution reaction occurs, and the effective surface area of the active sites decreases, thereby preventing the dissolution reaction from occurring, and the blocking effect is enhanced by the increase in the number of B-O-B bonds. Therefore, the reactivity of the dissolution loss reaction of the coke is continuously reduced by adding boric acid and borax, and the strength after the reaction is continuously enhanced;
2. the addition of the boron oxide increases the number of B-O-B bonds, so that the blocking effect on the dissolution loss reaction is further enhanced;
3. di-oxidationSilicon, titanium dioxide, calcium carbonate and calcium phosphate have negative catalysis on the reactivity of coke, so that the reactivity of the coke is reduced, and the strength of the coke after reaction is improved; phosphorus intercalates between layers of graphite crystals in the form of compounds in coke, forming substitutional solid solutions in carbon; phosphorus is a nonmetallic element, has the reaction performance of common nonmetallic elements, and in most cases, receives electrons, and forms electronegative ions on the surface of coke, so that the chemical adsorption potential of oxygen is increased, the reaction of oxygen on carbon is blocked, and the generation of CO is inhibited; the phosphate radical is partially dehydrated to obtain metaphosphoric acid HPO when the coke is heated to 1100 DEG C 3 Further dehydrating to obtain P 2 O 5 ，P 2 O 5 Is typically an acidic substance. Due to the dehydration of acidic substances by heating, at P 2 O 5 The surface forms P-O-P bonds. P is an electron-deficient body, has a tendency to be electrophilic, and the coke dissolution reaction is likely to occur at the defective site on the coke surface. The presence of a large number of carbon arc pairs on these surface defect sites causes the P-O-P bonds to readily aggregate toward lone pairs, thereby blocking the active sites upon which the dissolution reaction occurs, and the effective surface area of the active sites decreases, thereby preventing the dissolution reaction from occurring, and the blocking effect is enhanced by the increase in the number of P-O-P bonds. Therefore, the reactivity of the dissolution loss reaction of the coke is continuously reduced by adding the calcium phosphate, and the strength after the reaction is continuously enhanced;
4. lanthanum chloride is a trace element lanthanum introduced into a coke thermal-strength material system, and the addition of lanthanum can enhance the passivation effect of a passivating agent, so that the reactivity of the coke is further reduced, and the strength of the coke after reaction is improved;
5. alumina, high magnesium powder, silicon aluminum powder, silicon calcium powder and fructose are used as fillers, and are filled in micropores on the surface of coke, so that the production cost is reduced;
6. the triethanolamine is used as an antifreezing agent, and can endow the coke antifreezing agent with good antifreezing effect, so that the usability of the coke passivating agent in cold weather is enhanced.
Detailed Description
Examples 1-5 are presented to illustrate the composition of coke thermal strength materials. The components of examples 1-5 are shown in Table 1.
Table 1, examples 1-5 Coke Heat-Strength Material composition Table
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Boron-containing compound(s) | 40 | 30 | 33 | 35 | 38 |
| Boric acid, borax and boric oxide | 1∶1∶3 | 1∶1∶1 | 1∶1∶2 | 1∶3∶2 | 1∶2∶1 |
| Silica/part | 15 | 10 | 12 | 13 | 14 |
| Titanium dioxide/part | 10 | 8 | 6 | 5 | 7 |
| Calcium carbonate/part | 5 | 4 | 3 | 5 | 4 |
| Calcium phosphate/part | 3 | 2 | 1 | 2 | 3 |
| Lanthanum chloride/part | 1 | 0.8 | 0.5 | 0.7 | 1 |
| High magnesium powder | 30 | 20 | 22 | 25 | 27 |
| Silicon aluminum powder/part | 10 | 5 | 8 | 7 | 6 |
| Silicon-calcium powder | 5 | 10 | 7 | 8 | 9 |
| Fructose/serving | 5 | 4 | 3 | 1 | 2 |
| Triethanolamine/part | 3 | 2 | 1 | 1 | 2 |
Note that: the unit "parts" refers to parts by weight
The preparation process of the coke passivating agent of examples 1-5 is described in detail below in conjunction with table 1.
A preparation process of a coke passivating agent comprises the following steps:
step one: mixing boric acid, borax and boron oxide according to a weight ratio to obtain a boron-containing compound;
step two: weighing boron-containing compound, silicon dioxide, titanium dioxide, calcium carbonate, calcium phosphate, lanthanum chloride, high-magnesium powder, silicon aluminum powder, silicon calcium powder, fructose and triethanolamine according to parts by weight, and uniformly mixing.
The method of using the coke passivating agent of examples 1-5 is described in detail below.
The application method of the coke passivating agent comprises the following steps:
step 1: adding a coke passivating agent into water, and stirring for 5min to prepare a coke passivating agent solution with the concentration of 5%;
step 2: uniformly spraying the coke passivating agent solution on the surface of the coke, wherein the spraying amount is 10% of the mass of the coke, and storing the coke for 1h after the spraying is finished.
Reactivity and post-reaction Strength test
Step 1: the reactivity and the post-reaction strength of the coke sprayed with the coke passivating agent of examples 1 to 5 respectively were tested by referring to GB/T4000-1996 method for testing coke reactivity and post-reaction strength, and the coke sprayed with the coke passivating agent of examples 1 to 5 was measured as a control;
step 2: after repeating step 1 4 times, the obtained 5 times coke reactivity and post-reaction intensity were averaged.
Table 2, table of coke reactivity and post-reaction strength test record
From table 2 the following conclusions can be drawn:
1. comparative and examples 1-5, the reactivity of the coke sprayed with the coke passivating agent of examples 1-5 was much lower than that of the comparative example, and the strength after reaction was much higher than that of the comparative example;
2. comparative examples 1-5, spray example 3 was less reactive than the other examples and was stronger after reaction than the other examples.
Mechanical Strength test
The mechanical strength of the coke after spraying the coke passivating agent of examples 1 to 5 respectively was measured with reference to GB/T2006-2008 "method for measuring mechanical strength of Coke", while the coke without spraying the coke passivating agent of examples 1 to 5 was measured as a control.
Table 3, table of mechanical strength test record of coke
| Comparative example | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| M 40 /％ | 82.1 | 84.5 | 84.6 | 84.8 | 84.7 | 84.6 |
| M 10 /％ | 6.9 | 5.3 | 5.1 | 5.0 | 5.2 | 5.4 |
Note that: m is M 40 The larger the surface crushing strength is, the higher is; m is M 10 The smaller the indicating higher the abrasion resistance.
From table 3 the following conclusions can be drawn:
1. the comparative examples and comparative examples 1 to 5 were higher in crushing strength and abrasion resistance of the coke sprayed with the coke passivating agent of examples 1 to 5, i.e., the mechanical strength of the coke sprayed with the coke passivating agent of examples 1 to 5 was higher;
2. in comparison with comparative examples 1 to 5, the crushing strength and abrasion resistance of the coke sprayed with the coke passivating agent of example 3 were higher than those of the other examples, i.e., the mechanical strength of the coke sprayed with the coke passivating agent of example 3 was higher.
Comparative example 1
Example 4 of chinese patent publication No. CN101654634a was chosen as comparative example 1.
The coke sprayed with the coke passivating agent of example 3 and the coke sprayed with the coke passivating agent of comparative example 1 were tested with reference to the reactivity and strength after reaction test procedure, and the coke sprayed with the coke passivating agent of example 3 and the coke sprayed with the coke passivating agent of comparative example 1 were tested with reference to the mechanical strength test procedure.
Table 4, comparative example 1 and example 3 comparative test record table
| Example 3 | Comparative example 1 | |
| Reactivity/% | 21.47 | 28.19 |
| Post reaction intensity/% | 72.04 | 64.28 |
| M 40 /％ | 84.8 | 83.2 |
| M 10 /％ | 5.0 | 6.6 |
Note that: the larger M40, the higher the surface crushing strength; the smaller M10 indicates higher wear resistance.
From table 4, it can be concluded that the reactivity of the coke sprayed with the coke passivating agent of example 3 is lower, the strength after reaction is higher, and the crushing strength and the abrasion resistance are higher, compared to comparative example 1. Therefore, the invention can obviously reduce the reactivity of the coke and improve the strength and mechanical strength of the coke after reaction.
Comparative example 2
Comparative example 2 differs from example 3 in that ferroferric oxide was removed, and the other is the same as example 3.
Comparative example 3
Comparative example 3 differs from example 3 in that lanthanum chloride was removed, and the other is the same as example 3.
Comparative example 4
Comparative example 4 differs from example 3 in that the ferroferric oxide and lanthanum chloride were removed simultaneously, and the other is the same as example 3.
The coke sprayed with the coke passivating agent of example 3 and the coke sprayed with the coke passivating agents of comparative examples 2 to 4, respectively, were tested with respect to the reactivity and the post-reaction strength test procedure, and the coke sprayed with the coke passivating agent of example 3 and the coke sprayed with the coke passivating agent of comparative examples 2 to 4, respectively, were tested with respect to the mechanical strength test procedure.
Table 5, example 3 and comparative examples 2-4 comparative test record Table
| Example 3 | Comparative example 2 | Comparative example 3 | Comparative example 4 | |
| Reactivity/% | 21.47 | 25.74 | 25.89 | 26.12 |
| Post reaction intensity/% | 72.04 | 66.96 | 67.01 | 66.34 |
| M 40 /％ | 84.8 | 83.6 | 83.5 | 83.4 |
| M 10 /％ | 5.0 | 6.3 | 6.4 | 6.7 |
Note that: the larger M40, the higher the surface crushing strength; the smaller M10 indicates higher wear resistance.
From table 5 the following conclusions can be drawn:
the coke sprayed with the coke passivating agent of example 3 is superior to the coke sprayed with the coke passivating agents of comparative examples 2 and 3, respectively, in reactivity, strength after reaction, crushing strength, abrasion resistance, and the like.
The coke sprayed with the coke passivating agent of comparative example 4 was inferior to the coke sprayed with the coke passivating agents of comparative example 2 and comparative example 3, respectively, in both reactivity and strength after reaction. Thus, both calcium phosphate and lanthanum chloride can reduce the reactivity and improve the strength after the reaction. However, the degree of decrease in reactivity and the degree of increase in post-reaction strength caused by the combination of calcium phosphate and lanthanum chloride are greater than the sum of the degree of decrease in reactivity and the degree of increase in post-reaction strength caused by the separate use of calcium phosphate and lanthanum chloride. Therefore, the calcium phosphate and the lanthanum chloride can generate a compounding effect in the invention, and the reduction degree of the reactivity and the improvement degree of the strength after the reaction are increased.
The coke sprayed with the coke passivating agent of comparative example 2 was inferior to the coke sprayed with the coke passivating agent of comparative example 4 in both crushing strength and abrasion resistance, but was closer to the coke sprayed with the coke passivating agent of comparative example 3. It can be seen that lanthanum chloride has little effect on crushing strength and abrasion resistance, while calcium phosphate can improve crushing strength and abrasion resistance. However, the combination of calcium phosphate and lanthanum chloride results in a greater degree of improvement in crushing strength and abrasion resistance than lanthanum chloride alone. Therefore, the calcium phosphate and the lanthanum chloride can produce a compound effect in the invention, and the improvement degree of crushing strength and wear resistance is increased.
The present embodiment is merely illustrative of the present invention and is not intended to be limiting, and modifications thereof without creative contribution can be made by those skilled in the art after reading the present specification, as long as they are protected by patent laws within the scope of claims of the present invention.
Claims (6)
1. A coke passivating agent, which comprises the following components in parts by weight:
30-40 parts of boron-containing compound
10-15 parts of silicon dioxide
Titanium dioxide 5-10 parts
3-5 parts of calcium carbonate
1-3 parts of calcium phosphate
Lanthanum chloride 0.5-1 parts
The boron-containing compound comprises boric acid, borax and boron oxide, wherein the boric acid comprises the following components in percentage by weight: borax: boron oxide = 1:1-3:1-3.
2. The coke passivating agent of claim 1, wherein the coke thermal strength material further comprises 20-30 parts by weight of high magnesium powder.
3. The coke passivating agent according to claim 1, further comprising 5-10 parts by weight of silicon aluminum powder and 5-10 parts by weight of silicon calcium powder.
4. The coke passivating agent of claim 1, further comprising 1-5 parts by weight of fructose.
5. The coke passivating agent of claim 1, further comprising 1-3 parts by weight of triethanolamine.
6. The preparation process of the coke passivating agent is characterized by comprising the following steps of:
step one: boric acid, borax and boric oxide are mixed according to the weight ratio: borax: mixing boron oxide=1:1-3:1-3 to obtain a boron-containing compound;
step two: according to the weight portions, weighing 30-40 portions of boron-containing compound, 10-15 portions of silicon dioxide, 5-10 portions of titanium dioxide, 3-5 portions of calcium carbonate, 1-3 portions of calcium phosphate, 0.5-1 portion of lanthanum chloride, 20-30 portions of high magnesium powder, 5-10 portions of silicon aluminum powder, 5-10 portions of silicon calcium powder, 1-5 portions of fructose and 1-3 portions of triethanolamine, and uniformly mixing.
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