Sealing material for coke oven top coal charging port

Abstract

The invention relates to a sealing material for a coal charging port at the top of a coke oven, which comprises the following components in percentage by mass: 55-95% of aggregate, 5-45% of waste coke oven regenerative chamber checker brick powder and 2-15% of coke powder, the aggregate comprises 40-70% of bauxite, 30-60% of diatomite and 4-15% of a phosphoric acid binder, and the aggregate comprises the following chemical components in percentage by mass: greater than or equal to 10% of Al2O3, greater than or equal to 38% of SiO2 and greater than or equal to 5% of MgO; the waste coke oven regenerative chamber checker brick comprises the following components in percentage by mass: greater than or equal to 45% of Al2O3. From the perspective of waste utilization and production cost reduction, the waste checker bricks and coke powder of the regenerative chamber of the coke oven are applied to preparation of the sealing material for the coke oven top coal charging port, waste utilization is achieved, the production cost is reduced, and meanwhile good fluidity and sealing performance of the sealing material slurry can be guaranteed. The sealing effect of the coke oven coal charging hole cover is guaranteed, and the coke oven top coal charging hole cover is effectively prevented from smoking and firing.

Description

Technical Field

[0001] The invention belongs to the technical field of coking refractory materials, and in particular relates to a sealing material for a coal charging port on a coke oven top. Background Art

[0002] Coking is a crucial component of the carbon energy flow in the steelmaking process and a major energy consumer in integrated steelmaking complexes. The coke oven, the core unit of coking, is a highly efficient "energy converter" that converts primary coal into secondary energy sources such as coke, coke oven gas, tar, and crude benzene through high-temperature dry distillation. The coking process typically operates at temperatures between 1000 and 1300°C, with the furnace roof temperature reaching over 800°C. During the high-temperature dry distillation process, the coke oven's seals are compromised, and the high-temperature environment can easily lead to the leakage of pollutants and toxic and hazardous substances. With increasingly stringent environmental protection requirements in the coking industry, coke oven sealing requirements are receiving increased attention. During coking operations, the coke oven's roof coal loading port requires frequent opening and closing. This can cause friction and collision between the high-temperature loading port cover and the opening, resulting in a leaked seal. This allows smoke, pollutants, and toxic gases generated during the coking process to escape through the gap between the loading port seat and the cover, causing environmental pollution. In order to reduce the emission of pollutants from the coke oven top, sealing materials are usually used to seal the gap between the coal loading hole seat and the hole cover during coke oven production. This is an effective way to prevent the emission of pollutants from the coke oven.

[0003] Because the coal charging hole cover is often exposed to high temperatures of 700°C to 800°C, the sealing material must not crack when used in the furnace roof environment. Furthermore, the sealing material must be easy to open, non-sticky, and clean during coal loading. Initially, the sealant for the coke oven roof charging hole cover was primarily prepared using yellow mud mixed with pulverized coal. However, this resulted in poor sealing and environmental concerns such as smoke generation caused by ignition of the pulverized coal. With the increasing demand for environmental protection, technological advancements, and enhanced production control and management within various units, the properties of the sealant for the coke oven roof charging hole cover have been continuously improved. By combining refractory materials with kaolin, specialized sealants or castables for the coke oven roof charging hole cover have been developed, with controlled compositions of Al2O3, SiO2, and MgO. This has significantly improved the coke oven charging environment and enhanced the sealing performance of the coke oven, benefiting coke oven production.

[0004] As a high-temperature furnace, the coke oven's structure is primarily constructed with refractory bricks of various materials. For example, clay bricks are used extensively in the regenerator's checker bricks and side walls. However, as the coke oven's operating life increases, these clay bricks can become damaged, such as by melting, and must be replaced. These replaced regenerator checker bricks become waste and are disposed of. Regenerator checker bricks are primarily made of clay bricks, containing over 30% Al2O3, as well as K2O, Na2O, CaO, MgO, TiO2, and Fe2O3.

[0005] Patent CN 101648818B "Coke oven sealing material and its production method" discloses a production method for preparing coke oven sealing material using clean sand, yellow clay, xanthan gum, and cooked rubber powder as raw materials. The sealing material is relatively inexpensive and easy to prepare.

[0006] Patent CN1212278A "Sealing material for coke oven coal charging hole cover" provides a sealing material mainly composed of silicate powder, which has good sealing performance, moderate viscosity, and is easy to fall off when the cover is opened.

[0007] Patent CN111943694B "An automatic pouring slurry for coke oven roof" provides an automatic pouring slurry for coke oven roof composed of aggregate and water. It has good sealing effect, and the pouring slurry can remain in the storage tank without stratification or precipitation for 24 hours, has excellent anti-sedimentation performance, and good fluidity.

[0008] Patent CN106278291B, "A coke oven coal charging hole cover sealing material and its preparation method," provides a coke oven coal charging hole cover sealing material prepared from aggregate, fine powder and binder. The material mainly has the dual functions of forming a gel between silicate and bauxite, and gelling bauxite with phosphoric acid, effectively preventing the leakage of coke oven gas and pollutants. When the coke oven coal charging hole cover is opened, the sealing material does not adhere and is easy to fall off, and has a good use effect.

[0009] Patent CN107312554B "An automatic grouting material for coke oven coal charging holes" discloses an automatic grouting material for coke oven coal charging holes. The material of the automatic grouting material is composed of 82-92% pyrophyllite, 3-10% expanded vermiculite, 2-5% bentonite, 1-4% silica powder and 0.5-1.5% refractory fiber by weight percentage. The grouting material has a good application effect.

[0010] In summary, the coke oven sealants covered by currently disclosed patents are mostly prepared by blending and combining various ingredients to create finished sealants for use in coke oven roofs and other locations. These sealants have demonstrated some effectiveness in coke ovens. However, there is no research or application of waste coke oven refractory materials as sealants for the coal loading port covers on coke oven roofs. Summary of the Invention

[0011] The technical problem to be solved by the present invention is to provide a sealing material for the coal charging port on the top of a coke oven. Waste checker bricks and coke powder from the coke oven regenerator are used in the preparation of the sealing material for the coal charging port on the top of the coke oven. The waste utilization helps to reduce production costs while ensuring the good fluidity and sealing properties of the sealing material slurry.

[0012] To achieve the above objectives, the present invention adopts the following technical solutions:

[0013] A sealing material for a coal charging port on a coke oven roof comprises aggregate, checker brick powder of waste coke oven regenerators, and coke powder, wherein the components by mass percentage are as follows: aggregate: 55% to 95%, checker brick powder of waste coke oven regenerators: 5% to 45%, and coke powder: 2% to 15%.

[0014] The aggregate comprises 40% to 70% bauxite, 30% to 60% diatomaceous earth, and 4% to 15% phosphoric acid binder, and the chemical composition of the aggregate satisfies the following requirements by mass percentage: Al2O3 ≥ 10%, SiO2 ≥ 38%, and MgO ≥ 5%;

[0015] The checker bricks of the waste coke oven regenerator have a composition of Al2O3≥45% by mass.

[0016] The aggregate has a flow value of ≥260 mm when 45% to 55% of water is added.

[0017] The aggregate has a particle size greater than 2 mm and a mass proportion of ≤20%, a particle size less than 1 mm and a mass proportion of ≥55%, and a particle size less than 0.05 mm and a mass proportion of ≥25%.

[0018] The waste coke oven regenerator checker brick powder has a particle size of ≤3mm and a mass proportion of 100%, a particle size of >2mm and a mass proportion of ≤15%, and a particle size of <1mm and a mass proportion of ≥55%.

[0019] The coke powder has a particle size of ≤3 mm and a mass proportion of 100%, and a particle size of <1 mm and a mass proportion of ≥75%.

[0020] A sealing material for the coal charging port on the top of a coke oven, with a bulk density of ≥1.2g / cm 3 The flow value when adding 45% to 55% water is ≥240mm, and the flexural strength after heat treatment is ≥0.5MPa.

[0021] A sealing material for a coal charging port on a coke oven top is used. When used, the sealing material is mixed with water in a mass ratio of 1:(0.5-1.5), the mixture is evenly mixed and allowed to stand for more than one hour before use.

[0022] Compared with the existing technology, the beneficial effects of the present invention are:

[0023] This invention, designed to utilize waste and reduce production costs, incorporates waste checker bricks and coke dust from coke oven regenerators into the preparation of a sealant for the coke oven roof coal charging port. This waste utilization helps reduce production costs while ensuring the sealant's excellent fluidity and sealing properties. This sealant is less prone to settling, ensuring a secure seal for the coke oven's coal charging port cover. The sealant dries and solidifies within 8 to 25 seconds, remains crack-free for 35 to 80 hours, and effectively prevents smoke and fire from the coke oven roof coal charging port. DETAILED DESCRIPTION

[0024] It should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein in the specification of the application are for the purpose of describing specific embodiments only and are not intended to limit this application. Mentioning "embodiments" herein means that the specific features, structures or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention.

[0025] A sealing material for a coal charging port on a coke oven roof comprises aggregate, checker brick powder of waste coke oven regenerators, and coke powder, wherein the components by mass percentage are as follows: aggregate: 55% to 95%, checker brick powder of waste coke oven regenerators: 5% to 45%, and coke powder: 2% to 15%.

[0026] The aggregate comprises 40% to 70% bauxite, 30% to 60% diatomaceous earth, and 4% to 15% phosphoric acid binder, and the chemical composition of the aggregate satisfies the following requirements by mass percentage: Al2O3 ≥ 10%, SiO2 ≥ 38%, and MgO ≥ 5%;

[0027] The checker bricks of the waste coke oven regenerator have a composition of Al2O3≥45% by mass.

[0028] The aggregate has a flow value of ≥260 mm when 45% to 55% of water is added.

[0029] The aggregate has a particle size greater than 2 mm and a mass proportion of ≤20%, a particle size less than 1 mm and a mass proportion of ≥55%, and a particle size less than 0.05 mm and a mass proportion of ≥25%.

[0030] The waste coke oven regenerator checker brick powder has a particle size of ≤3mm and a mass proportion of 100%, a particle size of >2mm and a mass proportion of ≤15%, and a particle size of <1mm and a mass proportion of ≥55%.

[0031] The coke powder has a particle size of ≤3 mm and a mass proportion of 100%, and a particle size of <1 mm and a mass proportion of ≥75%.

[0032] A sealing material for the coal charging port on the top of a coke oven, with a bulk density of ≥1.2g / cm 3The flow value when adding 45% to 55% water is ≥240mm, and the flexural strength after heat treatment is ≥0.5MPa. The flow value is determined according to GB / T 22459.2, the flexural strength at room temperature is determined according to GB / T 3001, and the bulk density is determined according to GB / T 2997.

[0033] A sealing material for a coal charging port on a coke oven top is used. When used, the sealing material is mixed with water in a mass ratio of 1:(0.5-1.5), the mixture is evenly mixed and allowed to stand for more than one hour before use.

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0035] Example 1:

[0036] A sealing material for a coal charging port on a coke oven roof comprises aggregate, checker brick powder of waste coke oven regenerator, and coke powder, wherein the components by mass percentage are as follows: aggregate: 67%, checker brick powder of waste coke oven regenerator: 28%, and coke powder: 5%;

[0037] The aggregate includes 52% bauxite, 40% diatomaceous earth, and 8% phosphoric acid binder, and the chemical composition content meets the following requirements: Al2O3 is 20%, SiO2 is 53%, and MgO is 6%.

[0038] Aggregate, the flow value when adding 50% water is 251mm, the mass proportion of particle size > 2mm is 15%, the mass proportion of particle size < 1mm is 70%, and the mass proportion of particle size < 0.05mm is 35%.

[0039] The checker bricks of the waste coke oven regenerator are clay bricks with an Al2O3 content of 48%. After being crushed and ground into powder, the mass proportion of the particles ≤3mm is 100%, the mass proportion of the particles >2mm is 11%, and the mass proportion of the particles <1mm is 65%.

[0040] Coke powder, with a particle size of ≤3mm accounting for 100% by mass, and a particle size of <1mm accounting for 85% by mass.

[0041] The sealing material used for the coal charging port on the top of the coke oven has been measured to have a bulk density of 1.3 g / cm3 and a flow value of 268 mm when 50% water is added. The standard specimens made from the sealing material after heat treatment at 1100°C for 3 hours have a room temperature flexural strength of 0.75 MPa.

[0042] When in use, it is mixed with water in a mass ratio of 1:0.9 and then evenly allowed to stand for 2 hours for sealing the coal loading hole cover of the coke oven. The sealing effect is good. The sealing material takes 17 seconds to dry and solidify, and can achieve 43 hours without cracking, ensuring that there is no smoke or fire during the coking period.

[0043] Example 2:

[0044] A sealing material for a coal charging port on a coke oven roof comprises aggregate, checker brick powder of waste coke oven regenerators, and coke powder, wherein the components by mass percentage are as follows: aggregate: 80%, checker brick powder of waste coke oven regenerators: 15%, and coke powder: 5%.

[0045] The aggregate includes 50% bauxite, 41% diatomaceous earth, and 9% phosphoric acid binder, and the chemical composition content meets the following requirements: Al2O3 is 18%, SiO2 is 50%, and MgO is 6%.

[0046] Aggregate, the flow value when adding 50% water is 248mm, the mass proportion of particle size > 2mm is 13%, the mass proportion of particle size < 1mm is 85%, and the mass proportion of particle size < 0.05mm is 47%.

[0047] The checker bricks of the waste coke oven regenerator are clay bricks with an Al2O3 content of 46%. After being crushed and ground into powder, the particle size ≤3mm accounts for 100% by mass, the particle size >2mm accounts for 8% by mass, and the particle size <1mm accounts for 71% by mass.

[0048] Coke powder, with a particle size of ≤3mm accounting for 100% by mass, and a particle size of <1mm accounting for 82% by mass.

[0049] The sealing material used for the coal charging port on the top of the coke oven has been measured to have a bulk density of 1.36 g / cm3 and a flow value of 270 mm when 50% water is added. The standard specimens made from the sealing material after heat treatment at 1100°C for 3 hours have a room temperature flexural strength of 0.69 MPa.

[0050] When in use, it is mixed with water in a mass ratio of 1:1.1 and then evenly allowed to stand for 2 hours for sealing the coal loading hole cover of the coke oven. The sealing effect is good. The sealing material takes 13 seconds to dry and solidify, and can achieve 52 hours without cracking, ensuring that there is no smoke or fire during the coking period.

[0051] Example 3:

[0052] A sealing material for a coal charging port on a coke oven roof comprises aggregate, checker brick powder of waste coke oven regenerator, and coke powder, wherein the components by mass percentage are as follows: aggregate: 90%, checker brick powder of waste coke oven regenerator: 8%, and coke powder: 2%;

[0053] The aggregate includes 50% bauxite, 40% diatomaceous earth, and 10% phosphoric acid binder, and the chemical composition content meets the following requirements: Al2O3 is 22%, SiO2 is 53%, and MgO is 7%.

[0054] Aggregate, the flow value when adding 50% water is 251mm, the mass proportion of particle size > 2mm is 16%, the mass proportion of particle size < 1mm is 80%, and the mass proportion of particle size < 0.05mm is 45%.

[0055] The checker bricks of the waste coke oven regenerator are clay bricks with an Al2O3 content of 52%. After being crushed and ground into powder, the particle size ≤3mm accounts for 100% by mass, the particle size >2mm accounts for 10% by mass, and the particle size <1mm accounts for 76% by mass.

[0056] Coke powder, with a particle size of ≤3mm accounting for 100% by mass, and a particle size of <1mm accounting for 80% by mass.

[0057] The sealing material used for the coal charging port on the top of the coke oven has been measured to have a bulk density of 1.42 g / cm3 and a flow value of 280 mm when 50% water is added. The standard specimens made from the sealing material after heat treatment at 1100°C for 3 hours have a room temperature flexural strength of 0.8 MPa.

[0058] When in use, mix it with water in a mass ratio of 1:0.8 and let it stand evenly for 1 hour to seal the coal loading hole cover of the coke oven. The sealing effect is good. The sealing material takes 15 seconds to dry and solidify, and can be achieved without cracking for 48 hours, ensuring that there is no smoke or fire during the coking period.

[0059] Example 4:

[0060] A sealing material for a coal charging port on a coke oven roof comprises aggregate, checker brick powder of waste coke oven regenerators, and coke powder, wherein the components by mass percentage are as follows: aggregate: 56%, checker brick powder of waste coke oven regenerators: 40%, and coke powder: 4%;

[0061] The aggregate includes 45% bauxite, 40% diatomaceous earth, and 15% phosphoric acid binder, and the chemical composition content meets the following requirements: Al2O3 is 18%, SiO2 is 50%, and MgO is 6%.

[0062] Aggregate, the flow value when adding 50% water is 245mm, the mass proportion of particle size > 2mm is 14%, the mass proportion of particle size < 1mm is 79%, and the mass proportion of particle size < 0.05mm is 42%.

[0063] The checker bricks of the waste coke oven regenerator are clay bricks with an Al2O3 content of 50%. After being crushed and ground into powder, the particle size ≤3mm accounts for 100% by mass, the particle size >2mm accounts for 10% by mass, and the particle size <1mm accounts for 68% by mass.

[0064] Coke powder, with a particle size of ≤3mm accounting for 100% by mass, and a particle size of <1mm accounting for 83% by mass.

[0065] The sealing material used for the coal charging port on the top of the coke oven has been measured to have a bulk density of 1.43 g / cm3 and a flow value of 265 mm when 50% water is added. The standard specimens made from the sealing material after heat treatment at 1100°C for 3 hours have a room temperature flexural strength of 0.65 MPa.

[0066] When in use, it is mixed with water in a mass ratio of 1:1.2 and then evenly allowed to stand for 3 hours for sealing the coal loading hole cover of the coke oven. The sealing effect is good. The sealing material takes 11 seconds to dry and solidify, and can be achieved for 38 hours without cracking, ensuring that there is no smoke or fire during the coking period.

[0067] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and basic spirit of the invention, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A sealing material for a coal charging port on a coke oven roof, characterized in that: It includes aggregate, waste coke oven regenerator checker brick powder and coke powder, and the components by mass percentage are as follows: aggregate: 55% to 95%, waste coke oven regenerator checker brick powder: 5% to 45%, coke powder: 2% to 15%; The aggregate comprises 40% to 70% bauxite, 30% to 60% diatomaceous earth, and 4% to 15% phosphoric acid binder, and the chemical composition of the aggregate satisfies the following requirements by mass percentage: Al2O3 ≥ 10%, SiO2 ≥ 38%, and MgO ≥ 5%; The checker bricks of the waste coke oven regenerator have a composition of Al2O3≥45% by mass.

2. The sealing material for a coke oven top coal charging port according to claim 1, characterized in that: The aggregate has a flow value of ≥260 mm when 45% to 55% of water is added.

3. The sealing material for a coke oven top coal charging port according to claim 1, characterized in that: The aggregate has a particle size greater than 2 mm and a mass proportion of ≤20%, a particle size less than 1 mm and a mass proportion of ≥55%, and a particle size less than 0.05 mm and a mass proportion of ≥25%.

4. The sealing material for a coke oven top coal charging port according to claim 1, characterized in that: The waste coke oven regenerator checker brick powder has a mass proportion of 100% for a particle size of ≤3mm, a mass proportion of ≤15% for a particle size of >2mm, and a mass proportion of ≥55% for a particle size of <1mm.

5. The sealing material for a coke oven top coal charging port according to claim 1, characterized in that: The coke powder has a particle size of ≤3 mm and a mass proportion of 100%, and a particle size of <1 mm and a mass proportion of ≥75%.

6. A sealing material for a coke oven top coal charging port according to any one of claims 1 to 5, characterized in that: Bulk density ≥1.2g / cm 3 The flow value when adding 45% to 55% water is ≥240mm, and the flexural strength after heat treatment is ≥0.5MPa.

7. A sealing material for a coke oven top coal charging port according to any one of claims 1 to 5, characterized in that: When using, mix it with water in a mass ratio of 1: (0.5~1.5), mix evenly and let it stand for more than 1 hour before use.