CN113666756A - High-cost-performance high-strength wear-resistant castable for blast furnace water slag sluiceways and preparation method and application thereof - Google Patents

High-cost-performance high-strength wear-resistant castable for blast furnace water slag sluiceways and preparation method and application thereof Download PDF

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Publication number
CN113666756A
CN113666756A CN202010401778.9A CN202010401778A CN113666756A CN 113666756 A CN113666756 A CN 113666756A CN 202010401778 A CN202010401778 A CN 202010401778A CN 113666756 A CN113666756 A CN 113666756A
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blast furnace
strength wear
resistant castable
furnace water
percent
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张正富
张秀华
钱雨
田晶晶
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Central Research Institute of Building and Construction Co Ltd MCC Group
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Central Research Institute of Building and Construction Co Ltd MCC Group
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    • 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
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
    • C—CHEMISTRY; METALLURGY
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/71—Ceramic products containing macroscopic reinforcing agents
    • C04B35/74—Ceramic products containing macroscopic reinforcing agents containing shaped metallic materials
    • C04B35/76—Fibres, filaments, whiskers, platelets, or the like
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/04—Recovery of by-products, e.g. slag
    • C21B3/06—Treatment of liquid slag
    • C21B3/08—Cooling slag
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
    • C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
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    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
    • C04B2235/3241—Chromium oxides, chromates, or oxide-forming salts thereof
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    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/02—Physical or chemical treatment of slags
    • C21B2400/022—Methods of cooling or quenching molten slag
    • C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/05—Apparatus features
    • C21B2400/066—Receptacle features where the slag is treated

Abstract

The invention provides a high-strength wear-resistant castable for a blast furnace water slag sluiceway with higher cost performance and application thereof, and the castable is prepared from the following raw materials in percentage by mass: 55-70% of steel slag aggregate, 10-15% of pure calcium aluminate cement, 10-15% of high-alumina cement, 5-10% of ultrafine powder, 1-3% of stainless steel fiber, 0.5-1% of chrome green, 0-0.2% of sodium tripolyphosphate, 0-0.12% of FS water reducer, 0-0.05% of citric acid, and the sodium tripolyphosphate and the FS water reducer are not 0 at the same time. And uniformly mixing the components at normal temperature according to the proportion, and packaging to obtain the high-strength wear-resistant castable product. The material is stirred in a stirrer in site by adding water and is cast for construction, or is made into a precast block and is transported to the site for direct installation. The product has good construction performance, only needs proper maintenance, is used for blast furnace water slag flushing ditch lining, has the service life of more than 5 years, and does not need to be repaired during service.

Description

High-cost-performance high-strength wear-resistant castable for blast furnace water slag sluiceways and preparation method and application thereof
Technical Field
The invention belongs to the technical field of refractory materials and metallurgy, and relates to a high-strength wear-resistant castable for a blast furnace water slag sluicing channel, which is mainly applied to a blast furnace water slag sluicing channel lining.
Background
The common materials of the blast furnace water slag sluiceway are as follows: stone slab, cast iron (steel) plate, high-strength wear-resistant casting material (or high-strength wear-resistant casting material precast block), silicon carbide, silicon nitride material and the like with better wear resistance, wherein the high-strength wear-resistant casting material is most commonly used.
The service life of the traditional cast steel plate is only about two years; the silicon carbide and silicon nitride slag sluiceway lining also needs irregular repair and maintenance, and the material needs to be fired to obtain enough strength, so that the production and installation are troublesome, and the cost is high; the corundum or homogenized alumina is replaced by brown corundum, so that the cost is reduced, but along with increasingly strict national environmental protection requirements and less non-renewable high-quality bauxite, the price of the alumina is continuously increased, the service life of some corundum wear-resistant materials is only 3-5 years, and the cost performance of the corundum wear-resistant castable is not satisfactory in general.
The channel lining of the water slag flushing channel is mainly used for bearing the violent scouring and abrasion action of water slag and bearing certain high temperature and chemical erosion in the service period. In order to improve the durability of the high-strength wear-resistant castable for the water sluiceway, the following aspects must be considered:
1) the hardness of the aggregate of the lining material is improved, and the fracture toughness cannot be too poor;
2) the aggregate in the lining material is firmly combined with the matrix, and the matrix part is ensured to have high strength;
3) the lining material and the slag runner base material have good bonding performance, so that the lining material is prevented from falling off integrally;
4) the characteristics of the water granulated slag are fully considered, so that the lining material, particularly the matrix part can well resist the scouring abrasion and chemical corrosion of the water granulated slag.
Disclosure of Invention
The high-strength wear-resistant castable for the blast furnace water slag sluiceway, provided by the invention, has a high cost performance, the service life is easily more than 5 years, and in the service process, the castable does not need to be repaired.
The invention provides a high-strength wear-resistant castable for a blast furnace water slag sluiceway, which is high in cost performance and comprises the following raw materials in percentage by mass:
steel slag aggregate: 55 to 70 percent
Pure calcium aluminate cement: 10 to 15 percent
High-alumina cement: 10 to 15 percent
Ultra-fine powder: 5 to 10 percent
Stainless steel fiber: 1 to 3 percent
Chromium green: 0.5 to 1 percent
Sodium tripolyphosphate: 0 to 0.2 percent
FS water reducing agent: 0 to 0.12 percent
Citric acid: 0 to 0.05 percent of the total weight of the composition,
wherein the superfine powder is at least one of silicon dioxide micropowder and alumina micropowder, and the sodium tripolyphosphate and the FS water reducing agent are not 0 at the same time.
The steel slag aggregate comprises four particle sizes of 8-5 mm, 5-3 mm, 3-1 mm and 1-0.088 mm, and the mass ratio of the four particle sizes can be 0.6-1.4: 0.6-1.4, and preferably 0.7-1.3: 0.7-1.3.
The pure calcium aluminate cement may be CA71 cement, and the high alumina cement may be CA50-925 cement.
The superfine powder has a particle size of less than or equal to 5 μm, mainly comprises two kinds of silica micropowder and alumina micropowder, and preferably comprises one or two kinds of silica micropowder and alumina micropowder. Wherein the mass percent of the silicon dioxide micro powder is 3-5%.
The sodium tripolyphosphate and the FS water reducing agent can be used singly or compounded, the upper limit is preferably adopted when the sodium tripolyphosphate and the FS water reducing agent are used singly, and the upper limit is not preferably adopted when the sodium tripolyphosphate and the FS water reducing agent are compounded; the addition amount of citric acid is reasonably determined according to the construction temperature, the citric acid is not suitable for being added in cold winter, and the upper limit is suitable for being taken in hot summer, so that the construction and the service performance of the product are optimal. Specifically, the sodium tripolyphosphate can be 0.1-0.2%, and the FS water reducing agent can be 0.05-0.12%.
Unless otherwise defined, terms or words in the present invention have the meanings commonly understood and/or used in the art. Also, the words or terms should be understood to have meanings consistent with their meanings in the context and technical spirit of the present invention, based on the principle that the inventor can appropriately define the meanings of the words or terms to best explain the present invention.
The invention provides a preparation process of a high-strength wear-resistant castable for a blast furnace water slag sluiceway, which has higher cost performance, and the preparation process comprises the following steps: the materials are weighed according to the mixture ratio, then are fully mixed in a stirring device, such as a stirrer, at room temperature, and then are packaged into bags to obtain the product.
The main functions of various components in the high-strength wear-resistant castable for the blast furnace water slag sluicing channel, which is provided by the invention, are briefly described as follows:
1) steel slag aggregate: the steel slag particles mainly play a role of a skeleton, and the steel slag has very high hardness and excellent abrasion resistance. The steel slag has more pores and rough surface of steel slag particles, so that the matrix and the particles are firmly bonded.
2) Pure calcium aluminate cement and high alumina cement: they are the main bonding strength source of the high-strength wear-resistant castable. Tests show that after single cement is added to a certain value, the workability of the castable is poor, even the fluidity is lost along with the continuous increase of the cement addition, and on the premise of ensuring good workability, the total addition of the cement can be improved by compositely adding pure calcium aluminate and high-alumina cement into the matrix, so that the strength is improved, and the cost is more controllable. The cement has hydraulic property, so that the material can obtain enough strength after pouring construction and hardening, the normal-temperature compressive strength of the product produced by the invention can easily exceed 150-160 MPa after pouring and curing for 3 days, and the later strength can be slowly increased (the maximum theoretical strength is about 28 days of curing).
3) Ultra-fine powder: the castable mainly comprises two types of silica micropowder and alumina micropowder, wherein the silica micropowder can remarkably improve the fluidity of the castable and can select 92 silica fume, 94 silica fume or other silica fume. In summer construction season, the silica micro powder and the alumina micro powder with lower pH value are preferably selected.
4) Stainless steel fiber: the integrity and the durability of the construction body can be improved by adding a proper amount of the composite material.
5) Chromium green: the maintenance strength of the castable can be obviously improved by introducing a small amount of chromium green, when hot slag flows through, crystal lattices can be activated, the material is promoted to be sintered at medium and low temperature, the defect that the medium temperature strength of the cement-based material is sharply reduced is overcome, and the wear resistance of the working lining is prevented from being seriously damaged.
6) Sodium tripolyphosphate and FS water reducing agent: the two can be used independently or in a composite way, and compared with the single use, the composite use has better water reducing effect, can reduce the water adding amount and improve the maintenance strength of the casting material. In different seasons, the adverse effect of the air temperature on the construction performance can be reduced to a certain extent by adjusting the adding amount of the air and the water.
7) Citric acid: its main function is to regulate the solidification speed of casting material, and in winter, some trace or no additive may be added, and in hot summer, some additive may be added.
The invention provides a high-strength wear-resistant castable for a blast furnace water slag sluiceway, which has higher cost performance, and the production and application methods thereof are as follows: (1) the production equipment adopts a stirring device (such as a stirrer) to mix the raw materials in proportion; (2) uniformly mixing (for example, 3-6 minutes) in a stirrer at room temperature, discharging and packaging; (3) welding an anchoring nail and a tortoise shell net on a matrix of the blast furnace slag flushing channel, and erecting a mould according to the designed construction thickness; (4) the materials are transported to a slag flushing ditch site, a proper amount of water is added into a stirrer to be uniformly stirred (for example, 3-5 minutes), pouring construction is carried out, a vibration rod is used for properly vibrating (vibrating and compacting), and after hardening, demoulding and short-term maintenance can be carried out, thus the materials can be put into use. Or adopting another method in the steps (3) and (4): (3) according to the size required by the blast furnace water slag washing groove lining, a mould is manufactured, and materials are added with water and are uniformly stirred and then poured into a precast block; (4) and (5) transporting the precast block to a slag flushing ditch site, and installing and putting into use.
The invention has the main innovation points and beneficial effects that: 1) the steel slag which is rich in resources, low in price and super-hard and wear-resistant is used as a main raw material, and the addition amount accounts for 55-70% of the total proportion; 2) the cement is compounded, so that the total addition of the cement is increased, the product strength is improved, and the cost can be controlled; 3) the maintenance strength and the durability of the material are obviously improved by introducing a trace amount of chromium green; 4) by adjusting the proportion of the composite water reducing agent, selecting the variety of micro powder and adjusting the addition of citric acid, the high-strength wear-resistant castable can obtain ideal construction performance under construction environments in different seasons; 5) the product has excellent scouring and wear resistance during service, the service life is at least more than 5 years, repair is not needed during service, and the cost performance is high.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative only and not limiting.
Example 1
The raw materials are proportioned as follows: 8-5 mm 15% of steel slag aggregate, 5-3 mm 20%, 3-1 mm 20%, 1-0.088 mm 13.5%, 10% of CA71 pure calcium aluminate cement, 10% of CA50-925 high alumina cement, 3% of 94 silicon ash, 6% of alumina ultrafine powder, 2% of stainless steel fiber, 0.5% of chromium green, 0.1% of sodium tripolyphosphate, 0.05% of FS water reducing agent and 0.02% of citric acid.
After the high-strength wear-resistant castable is cured for 3 days, the compressive strength is 156MPa, and is 1080m3And (3) pouring construction is carried out on a water slag flushing ditch of the blast furnace, and the construction thickness of the thinnest part is 30 cm. The contract is to ensure the service life to be 5 years. After the automobile is in service for 3 years, the average wear thickness is measured on site to be 5.5-6 cm, and according to the wear speed, the service life can easily exceed 5 years, even if no accident occurs, the service time is expected to be more than 10 years.
Example 2
The raw materials are proportioned as follows: 8-5 mm 15% of steel slag aggregate, 5-3 mm 19%, 3-1 mm 19%, 1-0.088 mm 15%, 15% of CA71 pure calcium aluminate cement, 10% of CA50-925 high alumina cement, 5% of 96 silica fume, 1% of stainless steel fiber, 1% of chromium green, 0.05% of sodium tripolyphosphate, 0.1% of FS water reducing agent and 0.03% of citric acid.
The high-strength wear-resistant castable has the compressive strength of 168MPa after being maintained for 3 days, and is expected to obtain satisfactory wear resistance if applied to a water slag sluiceway of a blast furnace, and the service life of the castable can possibly reach 5-10 years.
Example 3
The raw materials are proportioned as follows: 8-5 mm 16% of steel slag aggregate, 5-3 mm 16%, 3-1 mm 16%, 1-0.088 mm 14.5%, 12% of CA71 pure calcium aluminate cement, 13% of CA50-925 high alumina cement, 4% of 94 silicon ash, 5% of alumina micropowder, 3% of stainless steel fiber, 0.5% of chromium green, 0.15% of sodium tripolyphosphate and 0.05% of citric acid.
The high-strength wear-resistant castable has compressive strength of 162MPa after being maintained for 3 days, and is expected to obtain satisfactory wear resistance and have service life of possibly 5-10 years when being applied to a water slag sluicing channel of a blast furnace.

Claims (8)

1. The high-strength wear-resistant castable for the blast furnace water slag sluiceway with high cost performance comprises the following raw materials in percentage by mass:
steel slag aggregate: 55 to 70 percent
Pure calcium aluminate cement: 10 to 15 percent
High-alumina cement: 10 to 15 percent
Ultra-fine powder: 5 to 10 percent
Stainless steel fiber: 1 to 3 percent
Chromium green: 0.5 to 1 percent
Sodium tripolyphosphate: 0 to 0.2 percent
FS water reducing agent: 0 to 0.12 percent
Citric acid: 0 to 0.05 percent of the total weight of the composition,
wherein the superfine powder is at least one of silicon dioxide micropowder and alumina micropowder, and the sodium tripolyphosphate and the FS water reducing agent are not 0 at the same time.
2. The high-strength wear-resistant castable for the blast furnace water slag sluiceway according to claim 1, wherein the steel slag aggregate comprises four kinds of particles with the particle sizes of 8-5 mm, 5-3 mm, 3-1 mm and 1-0.088 mm, and the mass ratio of the four kinds of particles is 0.6-1.4: 0.6-1.4.
3. The high-strength wear-resistant castable for the blast furnace water sluiceway according to claim 1, wherein the particle size of the ultrafine powder is not more than 5 μm.
4. The high-strength wear-resistant castable for the blast furnace water slag sluiceway according to claim 1, wherein the mass percentage of the silica micropowder is 3-5%.
5. The high-strength wear-resistant castable for the blast furnace water slag sluiceway according to claim 1, characterized in that the sodium tripolyphosphate and the FS water reducing agent are used singly or in a compound manner, and the upper limit is adopted when the sodium tripolyphosphate and the FS water reducing agent are used singly, and the upper limit is not adopted when the sodium tripolyphosphate and the FS water reducing agent are used in a compound manner.
6. The high-strength wear-resistant castable for the blast furnace water sluiceway according to claim 1, wherein the addition amount of citrate is reasonably determined according to the construction temperature, and the citrate is not added in cold winter, but is limited in hot summer.
7. A preparation method of the high-strength wear-resistant castable for the blast furnace water slag sluicing channel is characterized by weighing the raw materials in any one of claims 1 to 6 according to a proportion, fully mixing the raw materials in a stirring device, and then discharging the mixture to obtain the high-strength wear-resistant castable for the blast furnace water slag sluicing channel.
8. An application method of the high-strength wear-resistant castable for the blast furnace water slag sluicing channel is characterized in that the high-strength wear-resistant castable for the blast furnace water slag sluicing channel prepared in the method in claim 7 is fully stirred by adding a proper amount of water into a stirring device on site, and then is cast for construction and put into use; or the high-strength wear-resistant castable for the blast furnace water slag sluiceway prepared in the claim 7 is made into a precast block in advance, and the precast block is transported to the site and directly installed for use.
CN202010401778.9A 2020-05-13 2020-05-13 High-cost-performance high-strength wear-resistant castable for blast furnace water slag sluiceways and preparation method and application thereof Pending CN113666756A (en)

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