CN116751614A - Coke enhancement modifier, preparation method thereof and coke modification method - Google Patents
Coke enhancement modifier, preparation method thereof and coke modification method Download PDFInfo
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- CN116751614A CN116751614A CN202310701074.7A CN202310701074A CN116751614A CN 116751614 A CN116751614 A CN 116751614A CN 202310701074 A CN202310701074 A CN 202310701074A CN 116751614 A CN116751614 A CN 116751614A
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- 239000000571 coke Substances 0.000 title claims abstract description 174
- 239000003607 modifier Substances 0.000 title claims abstract description 67
- 238000002360 preparation method Methods 0.000 title abstract description 12
- 238000002715 modification method Methods 0.000 title abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 31
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 29
- 239000002994 raw material Substances 0.000 claims abstract description 24
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 claims abstract description 16
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 13
- 239000007787 solid Substances 0.000 claims abstract description 13
- 239000000080 wetting agent Substances 0.000 claims abstract description 13
- VYLVYHXQOHJDJL-UHFFFAOYSA-K cerium trichloride Chemical compound Cl[Ce](Cl)Cl VYLVYHXQOHJDJL-UHFFFAOYSA-K 0.000 claims abstract description 12
- NGDQQLAVJWUYSF-UHFFFAOYSA-N 4-methyl-2-phenyl-1,3-thiazole-5-sulfonyl chloride Chemical group S1C(S(Cl)(=O)=O)=C(C)N=C1C1=CC=CC=C1 NGDQQLAVJWUYSF-UHFFFAOYSA-N 0.000 claims abstract description 11
- 230000000051 modifying effect Effects 0.000 claims description 10
- 230000003014 reinforcing effect Effects 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 6
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 6
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 6
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 229920002153 Hydroxypropyl cellulose Polymers 0.000 claims description 5
- UDHMTPILEWBIQI-UHFFFAOYSA-N butyl naphthalene-1-sulfonate;sodium Chemical compound [Na].C1=CC=C2C(S(=O)(=O)OCCCC)=CC=CC2=C1 UDHMTPILEWBIQI-UHFFFAOYSA-N 0.000 claims description 5
- 239000001863 hydroxypropyl cellulose Substances 0.000 claims description 5
- 235000010977 hydroxypropyl cellulose Nutrition 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- 230000002708 enhancing effect Effects 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 27
- 230000009257 reactivity Effects 0.000 abstract description 18
- 230000008901 benefit Effects 0.000 abstract description 11
- 238000004090 dissolution Methods 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 10
- 230000004048 modification Effects 0.000 abstract description 9
- 238000012986 modification Methods 0.000 abstract description 9
- 229910000805 Pig iron Inorganic materials 0.000 abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 239000011247 coating layer Substances 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 18
- 230000000052 comparative effect Effects 0.000 description 13
- 229910052742 iron Inorganic materials 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 4
- 229910052747 lanthanoid Inorganic materials 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 229910052761 rare earth metal Inorganic materials 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 3
- 239000004327 boric acid Substances 0.000 description 3
- 150000002602 lanthanoids Chemical class 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910021538 borax Inorganic materials 0.000 description 2
- 229910052810 boron oxide Inorganic materials 0.000 description 2
- 238000005255 carburizing Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000004328 sodium tetraborate Substances 0.000 description 2
- 235000010339 sodium tetraborate Nutrition 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- -1 lanthanide rare earth chloride salt Chemical class 0.000 description 1
- FYDKNKUEBJQCCN-UHFFFAOYSA-N lanthanum(3+);trinitrate Chemical compound [La+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O FYDKNKUEBJQCCN-UHFFFAOYSA-N 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 235000010215 titanium dioxide Nutrition 0.000 description 1
- 239000010456 wollastonite Substances 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
Classifications
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Coke Industry (AREA)
Abstract
The invention provides a coke enhancement modifier, a preparation method thereof and a coke modification method, belonging to the technical field of blast furnace ironmaking. The coke enhancement modifier provided by the invention comprises the following raw material components: 15-30 parts of boric anhydride; 10-14 parts of solid water glass; 3-5 parts of mineralizer; 5-8 parts of film forming agent; 2-8 parts of a surface wetting agent; wherein the mineralizer is yttrium nitrate and cerium chloride according to the weight ratio of 1:1. The coke enhancement modifier provided by the invention can form a coating layer on the surface of the coke, can improve the toughness and strength of the coke, can delay the dissolution loss reaction of the coke, and reduces the cost of the conventional blast furnace ironmaking. The coke enhancement modifier has the advantages of wide raw material sources, simple preparation process and low cost; the method is simple, the dosage is small, the modification effect is good, the reactivity of the coke can be greatly reduced, and the strength of the coke after the reaction can be greatly improved. The method of the invention can reduce the coke ratio, increase the pig iron yield and reduce the carbon emission.
Description
Technical Field
The invention belongs to the technical field of blast furnace ironmaking, and particularly relates to a coke enhancement modifier, a preparation method thereof and a coke modification method.
Background
The steel industry is a high-energy-consumption and high-emission industry, and the reduction of consumption of raw materials such as fossil energy and the like and the energy consumption in the production process by new materials and new processes are always the pursued purposes of enterprises.
The modern blast furnace adopts the technologies of high air temperature, large air volume, oxygen enrichment, high coal ratio and the like, so that the aim of the enhanced smelting of the blast furnace is realized. Coke is an important metallurgical raw material, and has the following main effects on blast furnace ironmaking: (1) Supporting furnace burden in the furnace, playing a role of a framework and ensuring the air permeability of the furnace burden; (2) Providing smelting energy through an exothermic reaction with oxygen combustion; (3) as a reducing agent and carburizing agent for the iron ore; (4) Filling the hearth and activating the hearth to provide the space coefficient of the hearth. Therefore, blast furnace ironmaking places high demands on carbon collection.
Blast furnace ironmaking generally has the following requirements for coke: (1) The coke has high strength, is not easy to crack, and can resist the impact, extrusion and abrasion of coke from the furnace to the hearth so as to reduce the granularity; (2) The dissolution loss resistance is good, and the reactions of dissolution loss of coke in a high-temperature area, alkali metal erosion, slag iron dissolution loss, dissolution to molten iron and the like should be as slow as possible; and (3) the granularity range is narrow, so that better air permeability can be ensured.
However, the role of the fuel, reducing agent and carburizing agent that the coke plays in the blast furnace is diminished by the partial substitution of coal fines, while the role of the loose framework is enhanced, affecting the thermal properties of the coke. The residence time of the coke in the furnace is obviously prolonged, the melting loss of the coke in the furnace is obviously increased, the thermal strength of the coke is reduced, and the further strengthening of the blast furnace production is limited. Therefore, reducing the reactivity of the coke and improving the strength of the coke after reaction have become the key to strengthening the blast furnace smelting, reducing the coke ratio and ironmaking cost at present.
In the prior art, the method for reducing the coke ratio is realized by means of improving smelting strength, improving wind temperature, improving ore grade, improving coke quality and the like, but the method has the problem of high cost and cannot be practically applied to production operation.
Research in recent years shows that the adoption of the coke passivating agent can reduce the reactivity of the coke and improve the strength of the coke after reaction. For example, cui Ping, yang Min, etc. employ a soaking method to soak H 3 BO 3 、Na 2 CO 3 、CaCl 2 、FeCl 3 Equal loading in coke, study results showed that: by soaking in waterDifferent concentrations of minerals can be supported in the coke and B is ultimately present in the form of B 2 O 3 The method comprises the steps of carrying out a first treatment on the surface of the The existence of alkali and iron can accelerate the dissolution loss reaction of the coke, and the existence of boron can inhibit the dissolution loss reaction of the coke and has obvious resistance or shielding of the corrosion capability of the alkali and the iron. As another example, the practice of using the Jisteel passivated coke in a blast furnace has shown that: the passivating agent water is adopted for quenching coke, so that the gasification reactivity of the coke can be obviously reduced, and the strength after the reaction is improved. For another example, the ladle steel also carries out relevant coke passivation test research, and the test result shows that: the boric acid water is used for simulating industrial quenching, and the thermal reactivity and the strength after reaction of coke are obviously improved.
The research shows that the adoption of the coke modification method or the coke passivating agent can reduce the anti-thermal reactivity of the coke in blast furnace ironmaking to a certain extent and improve the strength of the coke after reaction. However, the method increases the production cost of the coking process and increases the investment period, thereby affecting the economic benefit of the whole enterprise and keeping the iron-making cost high.
In the patent method, a great deal of related research is also being conducted by existing enterprises and scholars. For example, patent CN 1321168C discloses a coke modification method, which uses a mixture of titanium white, boron oxide and boric acid as a solute, and sprays the mixture on the surface of coke to achieve the purposes of reducing the reactivity of the coke and improving the strength after reaction. For another example, patent CN 101082008B discloses a coke passivating agent containing lanthanide rare earth elements and a use method thereof, which is prepared by co-grinding 1-30wt% of borax, 1-20wt% of wollastonite and 0.01-5wt% of lanthanide rare earth chloride salt, mixing with 60-90wt% of boric acid, adding 0.01-2wt% of carboxymethyl cellulose after dosing, and obtaining the coke passivating agent solution containing lanthanide rare earth elements. For another example, patent CN 107142121B discloses a coke modifier and a coke modification method, the coke modifier is composed of 7 parts of boron oxide, 2 parts of sodium silicate and 1 part of polyacrylamide, the coke modifier is prepared into a coke modifier solution with the mass concentration of 4.0-7.0%, and then the coke modifier solution is sprayed before the coke is put into a furnace, so that the reactivity of the coke is reduced, the strength after the reaction is improved, and the air permeability of a blast furnace is improved.
The method can reduce the production cost to a certain extent, and the operation method only needs to spray the coke passivating agent on the coke, however, the method has the advantages of high use concentration, large dosage and higher modification cost of the required coke modifying agent, and the modifying agent has not obvious effects of reducing the reactivity of the coke and improving the strength of the coke after the reaction, and still needs to be further improved.
Therefore, how to provide a coke enhancement modifier which has the advantages of convenient raw material source, low cost, simple preparation process, small modifier consumption and good modification effect, and is a technical problem to be solved urgently.
Disclosure of Invention
The invention aims to solve the technical problems, and provides a coke enhancement modifier, a preparation method thereof and a coke modification method. The invention aims to solve the problems that the existing coke passivating agent has poor modifying effect and has insufficient effects of reducing the reactivity of coke and improving the strength of the coke after reaction; on the other hand, the problems of high modification cost caused by higher concentration and higher dosage of the existing coke passivating agent or modifier are solved.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the invention firstly provides a coke enhancement modifier, which comprises the following raw material components in parts by weight:
15-30 parts of boric anhydride;
10-14 parts of solid water glass;
3-5 parts of mineralizer;
5-8 parts of film forming agent;
2-8 parts of a surface wetting agent;
wherein the mineralizer is yttrium nitrate and cerium chloride according to the weight ratio of 1:1.
The sheet cleavage structure of the coke determines the characteristic of easy fragmentation under the action of external force, and the dissolution loss reaction of the soft melting zone is severe, so that the coke enhancement modifier can form a coating layer on the surface of the coke, not only can improve the toughness and strength of the coke, but also can delay the dissolution loss reaction of the coke, and has great significance on improving the stability of the blast furnace ironmaking process, reducing the coke ratio, reducing the emission and improving the economic benefit.
The coke enhancement modifier has the advantages of sufficient raw material source, simple preparation method and low cost. The coke enhancement modifier is used for blast furnace ironmaking, not only achieves the purposes of improving the coke strength and slowing down the coke dissolution loss, but also can realize the reduction of the coke ratio at low cost. The coke enhancement modifier provided by the invention obviously reduces the reactivity of the coke and greatly improves the strength of the coke after reaction.
On the other hand, the coke enhancement modifier has the advantages of low use concentration, small dosage and good modification effect, and can further reduce the input cost of the modifier.
The technical effect of the invention cannot be achieved by adopting other existing coke passivating agents or modifying agents. In addition, the modifying effect of the coke modifier which is not in the formula of the invention is obviously reduced.
Further, the coke enhancement modifier comprises the following raw material components in parts by weight:
20 parts of boric anhydride;
12 parts of solid water glass;
4 parts of mineralizer;
6 parts of film forming agent;
5 parts of a surface wetting agent.
Further, the film forming agent comprises hydroxypropyl cellulose or carboxymethyl cellulose.
Further, the surface wetting agent comprises sodium butylnaphthalene sulfonate.
Further, the modulus of the solid water glass is 1.5-2.5.
Further, the purity of the boric anhydride is more than 98%.
The second object of the present invention is to provide a method for preparing the coke enhancement modifier, comprising the following steps:
(1) Weighing corresponding raw materials according to parts by weight, and mixing;
(2) Adding the mixed raw material obtained in the step (1) into water, and uniformly stirring to obtain the coke enhancement modifier with the mass concentration of 1-2%.
The invention also provides a coke modification method, which comprises the following steps:
(1) Preparing a coke enhancement modifier solution;
(2) Spraying liquor on the surface of the coke before the coke is put into the furnace.
Further, the amount of the coke reinforcing modifier solution used in the step (2) is 1 to 2% by weight of the coke.
In the step (2), the coke enhancement modifier solution is sprayed on the surface of the coke by a pressurizing device or a spraying device.
The beneficial effects of the invention are as follows:
(1) The invention provides a coke enhancement modifier, which has the advantages of wide raw material sources, simple preparation process and low cost;
(2) The coke enhancement modifier provided by the invention has the advantages of low use concentration, less consumption and good modification effect, can obviously reduce the reactivity of the coke, and greatly improve the strength of the coke after reaction;
(3) The coke enhancement modifier provided by the invention can form a coating layer on the surface of the coke, can improve the toughness and strength of the coke, can delay the dissolution loss reaction of the coke, and reduces the cost of the conventional blast furnace ironmaking.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be specifically described with reference to the following examples, which are provided for explaining and illustrating the present invention only and are not intended to limit the present invention. Some non-essential modifications and adaptations of the invention according to the foregoing summary will still fall within the scope of the invention.
Example 1
The coke reinforcing modifier comprises the following raw material components in parts by weight:
15 parts of boric anhydride;
10 parts of solid water glass;
3 parts of mineralizer;
5 parts of film forming agent;
2 parts of a surface wetting agent;
wherein the mineralizer is yttrium nitrate and cerium chloride according to the weight ratio of 1:1. The film forming agent is hydroxypropyl cellulose or carboxymethyl cellulose. The surface wetting agent is sodium butylnaphthalene sulfonate. The modulus of the solid water glass is 1.5-2.5. The purity of the boric anhydride was 98%.
The preparation method of the coke enhancement modifier comprises the following steps:
(1) Weighing corresponding raw materials according to parts by weight, and mixing;
(2) Adding the mixed raw material obtained in the step (1) into water, and uniformly stirring to obtain the coke enhancement modifier with the mass concentration of 1%.
Example 2
The coke reinforcing modifier comprises the following raw material components in parts by weight:
30 parts of boric anhydride;
14 parts of solid water glass;
5 parts of mineralizer;
8 parts of film forming agent;
8 parts of a surface wetting agent;
wherein the mineralizer is yttrium nitrate and cerium chloride according to the weight ratio of 1:1. The film forming agent is hydroxypropyl cellulose or carboxymethyl cellulose. The surface wetting agent is sodium butylnaphthalene sulfonate. The modulus of the solid water glass is 1.5-2.5. The purity of the boric anhydride was 98%.
The preparation method of the coke enhancement modifier comprises the following steps:
(1) Weighing corresponding raw materials according to parts by weight, and mixing;
(2) Adding the mixed raw material obtained in the step (1) into water, and uniformly stirring to obtain the coke enhancement modifier with the mass concentration of 1%.
Example 3
The coke reinforcing modifier comprises the following raw material components in parts by weight:
20 parts of boric anhydride;
12 parts of solid water glass;
4 parts of mineralizer;
6 parts of film forming agent;
5 parts of a surface wetting agent.
Wherein the mineralizer is yttrium nitrate and cerium chloride according to the weight ratio of 1:1. The film forming agent is hydroxypropyl cellulose or carboxymethyl cellulose. The surface wetting agent is sodium butylnaphthalene sulfonate. The modulus of the solid water glass is 1.5-2.5. The purity of the boric anhydride was 98%.
The preparation method of the coke enhancement modifier comprises the following steps:
(1) Weighing corresponding raw materials according to parts by weight, and mixing;
(2) Adding the mixed raw material obtained in the step (1) into water, and uniformly stirring to obtain the coke enhancement modifier with the mass concentration of 1%.
Comparative example 1
Compared with the coke passivating agent containing lanthanide rare earth elements in the patent CN 101082008B, the coke passivating agent is added according to 3 weight percent of the mass of coke, the reactivity can be reduced to 19.57 percent, and the strength can be improved to 75.62 percent after thermal reaction.
Comparative example 2
In contrast to the coke passivating agent of patent CN 102041129B, which contains trace additives, which is added at 5wt% of the coke mass, the reactivity can be reduced to 18.72% and the strength can be increased to 77.64% after thermal reaction.
Comparative example 3
In contrast to the coke modifier of patent CN 107142121B, the concentration of the coke modifier solution is 7wt%, 30 kg of coke modifier is sprayed per ton of coke, the reactivity can be reduced to 18.30%, and the strength can be improved to 71.29% after thermal reaction.
Comparative example 4
The procedure of example 1 was followed, except that: the mineralizer is yttrium nitrate only.
Comparative example 5
The procedure of example 2 was followed, except that: the mineralizer is cerium chloride only.
Comparative example 6
The procedure of example 3 was followed, except that: the mineralizer adopts lanthanum nitrate and cerium chloride according to the weight ratio of 1:1.
Comparative example 7
The procedure of example 3 was followed, except that: the mineralizer adopts yttrium nitrate and cerium chloride according to the weight ratio of 2: 1.
Comparative example 8
The procedure of example 3 was followed, except that: the mineralizer adopts yttrium nitrate and cerium chloride according to the weight ratio of 1: 2.
Comparative example 9
The procedure of example 3 was followed, except that: the mineralizer adopts yttrium nitrate and cerium chloride according to the weight ratio of 1.5: 1.
Comparative example 10
The procedure of example 3 was followed, except that: the mineralizer adopts yttrium nitrate and cerium chloride according to the weight ratio of 1: 1.5.
Comparative example 11
The procedure of example 3 was followed, except that: the boric anhydride is replaced by borax.
Experimental example 1
The coke enhancement modifiers obtained in the above examples and comparative examples were used for modification of coke, respectively, by the following modification methods: spraying the prepared coke enhancement modifier solution on the surface of coke (10 kg) before the coke is put into a furnace, wherein the dosage of the fixed coke enhancement modifier solution (0.2 kg) is 1% of the weight of the coke, and spraying wine in a three-dimensional crossing and mist way through a pressurizing pump and a nozzle during spraying, so that the coke enhancement modifier solution is sprayed on the surface of the coke.
The thermal reactivity and the post-reaction strength of the coke were measured according to the standard of "GB/T4000-2017 coke reactivity and post-reaction strength test method", and the results obtained are shown in Table 1 below.
TABLE 1
From the experimental results in table 1, it is clear that the coke enhancement modifier prepared in the embodiment of the invention has good modifying effect on coke and excellent capability of improving thermal performance, and can reduce the reactivity of coke to 11.35% and improve the strength of the coke to 85.10% after reaction. Meanwhile, the coke enhancement modifier has the advantages of less consumption, low use concentration and good effect.
And when the using concentration and the using amount are reduced by adopting other coke modifiers in the comparative example or the prior art, the modifying effect on the coke is poor, and the effect of the invention cannot be realized.
Experiments show that the coke enhancement modifier provided by the invention effectively inhibits pulverization of coke in a furnace, enhances the skeleton supporting function, improves the air permeability index of a blast furnace, reduces the material-disintegrating and suspending of the blast furnace, reduces the viscosity of slag, and increases the fluidity of molten iron. In the blast furnace reaction of the modified coke, the coke ratio is reduced by 10-15kg/t iron, and the pig iron yield is increased by 5-8%.
Compared with the prior coke without modification, the method reduces the coke consumption by 8-13Kg per ton of pig iron, reduces the coke purchasing cost by 20-32.5 yuan per ton of pig iron, deducts the purchasing cost of 12 yuan per ton of the coke enhancement modifier, and reduces the iron cost by 12-22.5 yuan per ton.
By the method, the carbon dioxide emission can be reduced by 19.9-32.37Kg according to the coke consumption reduced by 8-13Kg per ton of pig iron, and the carbon sink income is 0.5-0.81 yuan.
The coke reinforcing modifier can reduce the cost of iron per ton by 12-22.5 hundred million yuan for enterprises according to the production of 1 hundred million tons of pig iron, collect 5000-8100 ten thousand yuan of carbon, and play a positive role in realizing the ambitious goal of China.
Claims (10)
1. The coke enhancement modifier is characterized by comprising the following raw material components in parts by weight:
15-30 parts of boric anhydride;
10-14 parts of solid water glass;
3-5 parts of mineralizer;
5-8 parts of film forming agent;
2-8 parts of a surface wetting agent;
wherein the mineralizer is yttrium nitrate and cerium chloride according to the weight ratio of 1:1.
2. The coke enhancement modifier of claim 1, wherein the coke enhancement modifier comprises the following raw material components in parts by weight:
20 parts of boric anhydride;
12 parts of solid water glass;
4 parts of mineralizer;
6 parts of film forming agent;
5 parts of a surface wetting agent.
3. The char-enhancing modifier of claim 1 or 2, wherein the film former comprises hydroxypropyl cellulose or carboxymethyl cellulose.
4. The coke enhancement modifier of claim 1 or 2, wherein the surface wetting agent comprises sodium butylnaphthalene sulfonate.
5. The coke breeze modifier of claim 1 or 2, wherein the solid water glass has a modulus of 1.5 to 2.5.
6. The coke breeze modifier of claim 1 or 2, wherein the purity of the boric anhydride is 98% or more.
7. The method for preparing a coke reinforcing modifier according to any one of claims 1 to 6, comprising the steps of:
(1) Weighing corresponding raw materials according to parts by weight, and mixing;
(2) Adding the mixed raw material obtained in the step (1) into water, and uniformly stirring to obtain the coke enhancement modifier with the mass concentration of 1-2%.
8. A method for modifying coke, comprising the steps of:
(1) Preparing a coke enhancing modifier solution according to the method of claim 7;
(2) Spraying liquor on the surface of the coke before the coke is put into the furnace.
9. The method for modifying coke according to claim 8, wherein the amount of the coke reinforcing modifier solution used in the step (2) is 1 to 2% by weight of the coke.
10. The method for modifying coke according to claim 8 or 9, wherein in the step (2), the coke enhancement modifier solution is sprayed on the surface of the coke by a pressurizing device or a spraying device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310701074.7A CN116751614A (en) | 2023-06-14 | 2023-06-14 | Coke enhancement modifier, preparation method thereof and coke modification method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310701074.7A CN116751614A (en) | 2023-06-14 | 2023-06-14 | Coke enhancement modifier, preparation method thereof and coke modification method |
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| Country | Link |
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