CN113149675A - Low-cement refractory castable for pumping construction - Google Patents
Low-cement refractory castable for pumping construction Download PDFInfo
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- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
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- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
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Abstract
The invention relates to a low-cement refractory castable for pumping construction, which comprises a dry material and an additive, wherein the dry material comprises the following components in parts by weight: 55-68 parts of refractory aggregate, 12-27 parts of refractory powder, 3-10 parts of superfine powder and 1-9 parts of bonding agent, wherein the additive comprises fiber and a composite additive, the weight of the fiber is 0.01-3% of the weight of dry materials, the weight of the composite additive is 0.1-0.5% of the weight of the dry materials, and the refractory castable further comprises water, and the weight of the water is 5-12% of the weight of the dry materials. The invention provides a method for preparing a high-density polyethylene glycol terephthalate (PEG) with a bulk density of 2.2-2.8 g/cm3The low-cement refractory castable overcomes the defect that the traditional low-cement refractory castable cannot be pumped, realizes pumping of the low-cement refractory castable, is convenient for on-site pouring construction, solves the problem of vertical conveying of high and large furnace body refractory castable, reduces the workload of workers, and improves the pouring efficiency; the stirred material arrives at the working tool in a short timeWhen the refractory lining is used as a surface, the working surface can be prevented from being added with water again, and the performance of the refractory lining body is effectively ensured.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a low-cement refractory castable for pumping construction.
Background
The furnace lining made of refractory materials plays roles of fire resistance, wear resistance, heat insulation and the like. The refractory cases differ in their manufacturing methods by: shaped refractories and unshaped refractories. The shaped refractory material is refractory brick with standard shape and may be also produced through building and temporary processing, and the refractory castable in the unshaped refractory material is powder mixture comprising aggregate and/or adhesive and has the advantages of being available in different shapes, high integrity, high sealing performance, etc. compared with available refractory brick, the castable is one kind of unshaped refractory material with great use amount and wide application range.
Compared with the common refractory castable, the low-cement refractory castable has the advantages of less cement amount, lower water consumption, more superior high-temperature performance such as mechanical property, refractory performance, wear resistance and the like, and more common application in the environment of more than 1000 ℃.
At present, the common construction method of the refractory castable comprises the following steps: the stirred refractory castable is transported into a furnace by using an ash bucket or a large trough, and then is split-packaged and cast; or the stirrer and the castable are placed on a platform beside the equipment, and the stirred refractory castable is conveyed to a construction surface by using a charging barrel or a chute for pouring. The disadvantages of this construction method are: the conveying of the stirred refractory castable is discontinuous, a large amount of manpower and time are needed, and the construction quality is not easy to guarantee.
The high-pressure pump is used for directly conveying the stirred refractory castable to a construction surface from the ground through a pipeline which is installed in advance, so that the conveying efficiency is greatly improved, the time and the labor are saved, and the cost is reduced. However, the low-cement refractory castable generally has the advantages of less water addition, higher viscosity, smaller flow value and shorter hardening time, and is not suitable for pumping construction.
Disclosure of Invention
The invention provides a low-cement refractory castable for pumping construction, which aims to solve the problem that the conventional low-cement refractory castable cannot be used for pumping construction due to low fluidity.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the low-cement refractory castable material for pumping construction comprises a dry material and an additive, wherein the dry material comprises the following components in parts by weight: 55-68 parts of refractory aggregate, 12-27 parts of refractory powder, 3-10 parts of superfine powder and 1-9 parts of bonding agent, wherein the additive comprises fiber and a composite additive, the weight of the fiber is 0.01-3% of the weight of dry materials, the weight of the composite additive is 0.1-0.5% of the weight of the dry materials, and the refractory castable further comprises water, and the weight of the water is 5-12% of the weight of the dry materials.
Preferably, the particle size of the refractory aggregate is in the range of 0.088-15mm, and the refractory aggregate is selected from one or more of corundum, silicon carbide, alumina, hard clay and quartz; the refractory powder is selected from one or more of corundum, silicon carbide, alumina, hard clay and quartz stone, and the particle diameter of the refractory powder is d1，d1Less than 0.08mm, the superfine powder is selected from one or more of corundum, silicon carbide, alumina powder, silicon micropowder, chromium oxide powder and zirconium oxide powder, and the particle diameter of the superfine powder is d2，d2≤45μm。
Preferably, the superfine powder is selected from one or a mixture of two of alumina powder and silica powder.
Preferably, the binder is selected from aluminate cements; the alumina content of the aluminate cement is 50-80%.
Preferably, the fiber is selected from one or more of organic fiber and inorganic fiber, the organic fiber is selected from polypropylene explosion-proof fiber, carbon fiber, graphite fiber and pulp waste liquor, and the inorganic fiber is selected from heat-resistant stainless steel fiber, aluminum silicate fiber, glass fiber and asbestos fiber.
Preferably, the composite additive is a mixture of two or more components selected from sulfonic acid formaldehyde condensate, phosphoric acid alkali metal polymer, carboxylic acid polymer, alkyl sulfonate, metal fine powder and sodium alkyl benzene sulfonate.
Preferably, the alkali metal phosphate polymer is selected from one or more of sodium tripolyphosphate, sodium hexametaphosphate, sodium polyphosphate, sodium pyrophosphate.
Preferably, the dry material of the refractory castable also comprises 1.5-10 parts of an expanding agent, wherein the expanding agent is selected from one or a mixture of more of quartz substances, kyanite substances, in-situ synthesized mullite and spinel substances.
Preferably, the dry material of the low-cement refractory castable comprises the following components in parts by weight: 68 parts of refractory aggregate, 14 parts of refractory powder, 6 parts of superfine powder, 7 parts of bonding agent and 5 parts of expanding agent, wherein the additive comprises fiber accounting for 1.1 percent of the weight of dry materials and composite additive accounting for 0.2 percent of the weight of dry materials.
Preferably, the composite additive also comprises one or a mixture of two of calcium silicate and calcium aluminate, and one or a mixture of two of polyether polyol and polyester polyol, wherein the metal fine powder is selected from one or a mixture of two of alkaline earth metals, and the sulfonic acid formaldehyde condensate is selected from lignin.
Compared with the prior art, the invention has the following advantages:
(1) the invention provides a method for preparing a high-density polyethylene glycol terephthalate (PEG) with a volume density of 2.2g/cm3—2.8g/cm3The low-cement refractory castable overcomes the defect that the traditional low-cement refractory castable cannot be pumped, realizes pumping of the low-cement refractory castable, is convenient for on-site pouring construction, solves the problem of vertical conveying of high and large furnace body refractory castable, reduces the workload of workers, saves time and labor, reduces the cost and improves the pouring efficiency.
(2) Because the low-cement refractory castable is stirred for a certain time after the water adding amount is strictly controlled on the ground, the stirred material can reach a working surface in a short time after being pumped, so that the castable is prevented from being added with water again in the working surface, and the performance of the refractory lining body is effectively ensured.
(3) The low-cement refractory castable provided by the invention has better sintering performance and shrinkage resistance, and the setting and hardening time of the low-cement refractory castable is adjusted, so that the low-cement refractory castable is more excellent in mechanical property, refractory performance and wear resistance under a high-temperature condition, and is further favorable for being used as a heat transfer component with higher temperature of a construction hot side.
Detailed Description
In order to solve the technical problems, the invention provides a low-cement refractory castable for pumping construction, which comprises a dry material and an additive, wherein the dry material comprises the following components in parts by weight: 55-68 parts of refractory aggregate, 12-27 parts of refractory powder, 3-10 parts of superfine powder and 1-9 parts of bonding agent, wherein the additive comprises fiber and a composite additive, the weight of the fiber is 0.01-3% of the weight of dry materials, the weight of the composite additive is 0.1-0.5% of the weight of the dry materials, and the refractory castable further comprises water, and the weight of the water is 5-12% of the weight of the dry materials. When the composite heat-resistant material is used, dry materials, fibers and a composite additive are uniformly mixed, then the mixture is added into a high-efficiency stirrer, a proper amount of water is added, the mixture is stirred at a high speed for 5-8min and then is pumped to a construction surface through a double-piston pump for construction, the stirring time strictly complies with the requirements, and otherwise, the heat resistance of the composite heat-resistant material is influenced by the generation of large bubbles. Wherein, the particle size of the refractory aggregate is generally more than 0.088mm and the maximum particle size is not more than 15mm, the specific size is determined by the thickness of the refractory lining, the refractory aggregate is a natural or artificial synthetic material with higher refractoriness and hardness, and the material of the refractory aggregate can be selected from one or more of corundum, silicon carbide, alumina, hard clay and quartz; among them, the use of corundum and silicon carbide increases the volume density, refractory temperature and thermal conductivity of the refractory castable. The refractory powder material can be selected from a further ground refractory aggregate, and can also be selected from one or more of corundum, silicon carbide, alumina, hard clay and quartz stone, wherein the addition of the silicon carbide powder material is beneficial to the thermal conductivity and the thermal shock resistance of the refractory castable, and the refractory powder materialThe grade is generally higher than that of the refractory aggregate, and the grain diameter of the refractory powder is d1，d1Less than 0.08 mm. The material of the superfine powder can be selected from one or more of corundum, silicon carbide, alumina powder, silicon micropowder, chromium oxide powder and zirconium oxide powder, and the particle diameter of the superfine powder is d2，d2≤45μm，d2Has an average particle diameter of 5 μm. Preferably, the superfine powder is one or a mixture of two of alumina powder and silica powder.
Optionally, the binder is selected from aluminate cement; according to different working temperatures of the refractory castable and chemical corrosion degrees in use occasions, the alumina content of the aluminate cement is 50% -80%, for example, the alumina content of the aluminate cement can be selected to be 50%, 70% or 80%.
Optionally, the fiber is selected from one or more of organic fiber and inorganic fiber, the organic fiber is selected from polypropylene explosion-proof fiber, carbon fiber, graphite fiber and pulp waste liquor, and the inorganic fiber is selected from heat-resistant stainless steel fiber, aluminum silicate fiber, glass fiber and asbestos fiber. The use of the organic fiber is beneficial to discharging water vapor in a furnace lining, and the use of the inorganic fiber is convenient to increase the toughness of the refractory castable.
Optionally, the composite additive is selected from a mixture of two or more of sulfonic acid formaldehyde condensate, alkali metal phosphate polymer, carboxylic acid polymer, alkyl sulfonate, metal fine powder and sodium alkyl benzene sulfonate, wherein the carboxylic acid polymer plays a role of retarding coagulation, the water consumption of the refractory castable can be reduced through the composite additive, the sintering performance, the shrinkage performance, the flowing performance and the consistency of the refractory castable are improved, the setting and hardening time is adjusted, meanwhile, the fluidity and the water retention of the refractory castable are improved, certain tiny bubbles are generated to play a role of lubricating refractory particles in the castable, and the castable is enabled to move integrally and more easily under the action of pressure generated by a piston of a pump truck, wherein the pump truck is a pump truck provided with a double-piston pump.
Optionally, the alkali metal phosphate polymer is selected from one or more of sodium tripolyphosphate, sodium hexametaphosphate, sodium polyphosphate, sodium pyrophosphate.
In addition, the dry material of the refractory castable also comprises 1.5-10 parts of an expanding agent, and the expanding agent can generate volume expansion at a certain temperature so as to counteract the shrinkage of the refractory castable under a high-temperature condition. The expanding agent is often selected from substances which can generate crystal transformation or reaction under high temperature condition to generate volume expansion, and the expanding agent can be selected from one or more of quartz substances, kyanite substances, in-situ synthesized mullite and spinel substances.
Preferably, the dry material of the low-cement refractory castable comprises the following components in parts by weight: 68 parts of refractory aggregate, 14 parts of refractory powder, 6 parts of superfine powder, 7 parts of bonding agent and 5 parts of expanding agent, wherein the additive comprises fiber accounting for 1.1 percent of the weight of dry materials and composite additive accounting for 0.2 percent of the weight of dry materials.
Optionally, the composite additive further comprises one or a mixture of two of calcium silicate and calcium aluminate, and one or a mixture of two of polyether polyol and polyester polyol, wherein the metal fine powder is one or a mixture of two of alkaline earth metals, the metal fine powder is an alkaline earth metal simple substance, preferably simple substance silicon and simple substance aluminum, and the sulfonic acid formaldehyde condensate is selected from but not limited to lignin.
The present invention will be specifically described below by way of examples. It is to be noted that the following examples are only for further illustration of the present invention and should not be construed as limiting the scope of the present invention. Many non-essential modifications and adaptations of the present invention will occur to those skilled in the art in view of the foregoing description, and are intended to be within the scope of the present invention. In addition, the starting materials used are all commercially available, unless otherwise specified.
Example 1
The low-cement refractory castable for pumping construction comprises a dry material and an additive, wherein the dry material comprises the following components in parts by weight: 55 parts of refractory aggregate, 27 parts of refractory powder, 10 parts of superfine powder and 8 parts of aluminate cement with the content of alumina of 50 percent, wherein the particle size range of the refractory aggregate is 0.088-15mm, and the refractory aggregate is made of corundum,Silicon carbide, the weight ratio of which is as follows: 1: 1; the refractory powder is a refractory aggregate which is further ground, and the particle size of the refractory powder is d1，d1Less than 0.08 mm. The superfine powder comprises corundum, silicon carbide, alumina and zirconia powder, and the mass ratio of the corundum to the silicon carbide to the alumina is as follows: 2:1:1:3, the particle diameter of the superfine powder is d2，d2Less than or equal to 45 mu m. The additive comprises fibers accounting for 0.01 to 3 percent of the weight of dry materials and a composite additive accounting for 0.1 to 0.5 percent of the weight of the dry materials, wherein the fibers specifically comprise polypropylene explosion-proof fibers, heat-resistant stainless steel fibers and aluminum silicate fibers in weight ratio：2:1: 1; the composite additive comprises a sulfonic acid formaldehyde condensate and an alkali metal phosphate polymer, and the weight ratio of the sulfonic acid formaldehyde condensate to the alkali metal phosphate polymer is as follows: 3:2. The alkali metal phosphate polymer comprises sodium pyrophosphate, the fine metal powder comprises simple substance silicon and simple substance aluminum, and the mass ratio of the simple substance silicon to the simple substance aluminum is as follows: 1:1. The sulfonic acid formaldehyde condensate is lignin.
The refractory castable also comprises water, and the weight of the water is 12% of the weight of the dry materials. When the dry material is used, the dry material, the fiber and the composite additive are uniformly mixed, then the mixture is added into a high-efficiency stirrer, and is added with a proper amount of water, and then the mixture is stirred at a high speed for 7min and is pumped to a construction surface by a double-piston pump for construction.
Example 2
The low-cement refractory castable for pumping construction comprises a dry material and an additive, wherein the dry material comprises the following components in parts by weight: 55 parts of refractory aggregate, 20 parts of refractory powder, 10 parts of superfine powder, 9 parts of aluminate cement with the content of alumina of 50 percent and 6 parts of expanding agent, wherein the particle size range of the refractory aggregate is 0.088-15mm, the refractory aggregate is made of corundum and silicon carbide, and the mass ratio of the corundum to the silicon carbide is 1: 1; the refractory powder is a refractory aggregate which is further ground, and the particle size of the refractory powder is d1，d1Less than 0.08 mm. The superfine powder is prepared from alumina powder and silicon powder at a mass ratio of 2:1, and has a particle diameter d2，d2Less than or equal to 45 mu m. The expanding agent comprises a quartz-like substance. The additive comprises fibers accounting for 0.1 percent of the weight of dry materials and a composite additive accounting for 0.3 percent of the weight of the dry materials, the fibers specifically comprise polypropylene explosion-proof fibers and pulp waste liquid, the mass ratio of the polypropylene explosion-proof fibers to the pulp waste liquid is 3:1, and the composite additive packageThe metal powder comprises a sulfonic acid formaldehyde condensate, an alkali metal phosphate polymer, a carboxylic acid polymer, an alkyl sulfonate and metal fine powder, wherein the weight ratio of the sulfonic acid formaldehyde condensate to the alkali metal phosphate polymer to the carboxylic acid polymer is as follows: 2:2:2:2:1. The alkali metal phosphate polymer is selected from sodium tripolyphosphate and sodium hexametaphosphate, and the weight ratio is as follows: 1:1, preparing a simple substance silicon and a simple substance aluminum from metal fine powder, wherein the mass ratio of the simple substance silicon to the simple substance aluminum is as follows: 1:1. The refractory castable also comprises water, and the weight of the water is 8% of the weight of the dry materials. When the dry material is used, the dry material, the fiber and the composite additive are uniformly mixed, then the mixture is added into a high-efficiency stirrer, and is added with a proper amount of water, and then the mixture is stirred at a high speed for 6min and is pumped to a construction surface by a double-piston pump for construction.
Example 3
The low-cement refractory castable for pumping construction comprises a dry material and an additive, wherein the dry material comprises the following components in parts by weight: 68 parts of refractory aggregate, 12 parts of refractory powder, 8 parts of superfine powder, 8 parts of aluminate cement with the content of alumina being 80 percent and 4 parts of expanding agent, wherein the grain diameter range of the refractory aggregate is 0.088-15mm, and the refractory aggregate is made of corundum; the refractory powder is silicon carbide, alumina and quartz stone, and the weight ratio is as follows: 2:1:1, particle size of refractory powder is d1，d1Less than 0.08 mm. The superfine powder comprises alumina powder, chromium oxide powder and zirconium oxide powder, and the mass ratio is as follows: 2:2:1, the particle diameter of the superfine powder is d2，d2Less than or equal to 45 mu m. The expanding agent comprises a kyanite substance and in-situ synthesized mullite in the mass ratio: 2:1. The additive comprises fibers accounting for 0.01 percent of the weight of dry materials and a composite additive accounting for 0.5 percent of the weight of the dry materials, the fibers specifically comprise pulp waste liquid and heat-resistant stainless steel fibers, and the weight ratio is as follows: 1: 3; the composite additive comprises a sulfonic acid formaldehyde condensate and a carboxylic acid polymer, and the weight ratio of the sulfonic acid formaldehyde condensate to the carboxylic acid polymer is as follows: 1:2. The alkali metal phosphate polymer is selected from sodium tripolyphosphate, and the metal fine powder is selected from elemental silicon. The sulfonic acid formaldehyde condensate is lignin.
The refractory castable also comprises water, and the weight of the water is 5% of the weight of the dry materials. When the dry material is used, the dry material, the fiber and the composite additive are uniformly mixed, then the mixture is added into a high-efficiency stirrer, and is added with a proper amount of water, and then the mixture is stirred at a high speed for 8min and is pumped to a construction surface by a double-piston pump for construction.
Example 4
The low-cement refractory castable for pumping construction comprises a dry material and an additive, wherein the dry material comprises the following components in parts by weight: 60 parts of refractory aggregate, 27 parts of refractory powder, 3 parts of superfine powder, 9 parts of aluminate cement with the alumina content of 70 percent and 1 part of expanding agent, wherein the particle size range of the refractory aggregate is 0.088-15mm, and the refractory aggregate comprises alumina; the refractory powder is corundum and hard clay, and the weight ratio is as follows: 2:3, particle diameter of refractory powder material is d1，d1Less than 0.08 mm. The material of the superfine powder comprises silicon carbide, alumina and silicon powder with the weight ratio of 2:1:2, and the grain diameter of the superfine powder is d2，d2Less than or equal to 45 mu m. The expanding agent comprises a kyanite substance and a spinel substance, and the mass ratio of the materials is as follows: 3:2. The additive comprises fibers accounting for 3 percent of the weight of dry materials and a composite additive accounting for 0.1 percent of the weight of the dry materials, wherein the fibers specifically comprise polypropylene explosion-proof fibers, heat-resistant stainless steel fibers and aluminum silicate fibers, and the weight ratio of the fibers to the heat-resistant stainless steel fibers to the aluminum silicate fibers is 2:1: 1; the composite additive comprises a sulfonic acid formaldehyde condensate, a phosphoric acid alkali metal polymer, a carboxylic acid polymer, an alkyl sulfonate, metal fine powder and sodium alkyl benzene sulfonate, and the weight ratio is as follows: 1:1:3:1:0.5:1. The alkali metal phosphate polymer is selected from sodium tripolyphosphate, sodium hexametaphosphate, sodium polyphosphate and sodium pyrophosphate, and the weight ratio is as follows: 3:1:0.5:1, and metal fine powder is simple substance aluminum. The refractory castable also comprises water, and the weight of the water is 12% of the weight of the dry materials. When the dry material is used, the dry material, the fiber and the composite additive are uniformly mixed, then the mixture is added into a high-efficiency stirrer, and is added with a proper amount of water, stirred at a high speed for 5min and then pumped to a construction surface by a double-piston pump for construction.
Example 5
The low-cement refractory castable for pumping construction comprises a dry material and an additive, wherein the dry material comprises the following components in parts by weight: 68 parts of refractory aggregate, 27 parts of refractory powder, 3 parts of superfine powder, 1 part of aluminate cement with the content of alumina of 70 percent and 1 part of expanding agent, wherein the particle size range of the refractory aggregate is 0.088-15mm, and the refractory aggregate is made of stoneEnglish; the refractory powder is corundum and hard clay, and the weight ratio is as follows: 2:3, particle diameter of refractory powder material is d1，d1Less than 0.08 mm. The material of the superfine powder comprises silicon carbide, alumina and silicon powder with the weight ratio of 2:1:2, and the grain diameter of the superfine powder is d2，d2Less than or equal to 45 mu m. The expanding agent comprises a kyanite substance and a spinel substance, and the mass ratio of the materials is as follows: 3:2. The additive comprises fibers accounting for 3 percent of the weight of dry materials and a composite additive accounting for 0.1 percent of the weight of the dry materials, wherein the fibers specifically comprise polypropylene explosion-proof fibers, heat-resistant stainless steel fibers and aluminum silicate fibers, and the weight ratio of the fibers to the heat-resistant stainless steel fibers to the aluminum silicate fibers is 2:1: 1; the composite additive comprises a sulfonic acid formaldehyde condensate, a phosphoric acid alkali metal polymer, a carboxylic acid polymer, an alkyl sulfonate, metal fine powder and sodium alkyl benzene sulfonate, and the weight ratio is as follows: 1:1:3:1:0.5:1. The alkali metal phosphate polymer is selected from sodium tripolyphosphate, sodium hexametaphosphate, sodium polyphosphate and sodium pyrophosphate, and the weight ratio is as follows: 3:1:0.5:1, and metal fine powder is simple substance aluminum. The refractory castable also comprises water, and the weight of the water is 12% of the weight of the dry materials. When the dry material is used, the dry material, the fiber and the composite additive are uniformly mixed, then the mixture is added into a high-efficiency stirrer, and is added with a proper amount of water, stirred at a high speed for 5min and then pumped to a construction surface by a double-piston pump for construction.
Example 6
The low-cement refractory castable for pumping construction comprises a dry material and an additive, wherein the dry material comprises the following components in parts by weight: 68 parts of refractory aggregate, 14 parts of refractory powder, 6 parts of superfine powder, 7 parts of aluminate cement with the content of alumina being 80 percent and 5 parts of expanding agent, wherein the particle size range of the refractory aggregate is 0.088-15mm, the refractory aggregate is made of corundum, silicon carbide, alumina, hard clay and quartz, and the weight ratio of the materials is as follows: 5:5:1:1: 1; the refractory powder is a refractory aggregate which is further ground, and the particle size of the refractory powder is d1，d1Less than 0.08 mm. The material of the superfine powder comprises alumina powder, silica powder, chromium oxide powder and zirconium oxide powder, the weight ratio of the materials is 3:1:1:1, and the particle diameter of the superfine powder is d2，d2Less than or equal to 45 mu m. The expanding agent comprises quartz substances and spinel substances, and the mass ratio of the expanding agent to the spinel substances is as follows: 3:2. Addition ofThe agent comprises fibers accounting for 1.1 percent of the weight of dry materials and a composite additive accounting for 0.2 percent of the weight of the dry materials, wherein the fibers specifically comprise polypropylene explosion-proof fibers, carbon fibers, graphite fibers and pulp waste liquor, and the weight ratio of the fibers to the pulp waste liquor is 3:0.5:0.5: 2; the composite additive comprises a sulfonic acid formaldehyde condensate, an alkali metal phosphate polymer, a carboxylic acid polymer, an alkyl sulfonate, metal fine powder, calcium silicate and polyether polyol, and the weight ratio is as follows: 5:2:2:1:0.5:0.5:0.5. The alkali metal phosphate polymer is selected from sodium tripolyphosphate, sodium hexametaphosphate, sodium polyphosphate and sodium pyrophosphate, and the weight ratio is as follows: 3:1:0.5:1, wherein the metal fine powder comprises simple substance silicon and simple substance aluminum, and the mass ratio of the simple substance silicon to the simple substance aluminum is as follows: 1:1. The sulfonic acid formaldehyde condensate is lignin.
The refractory castable also comprises water, and the weight of the water is 8.5% of the weight of the dry materials. When the dry material is used, the dry material, the fiber and the composite additive are uniformly mixed, then the mixture is added into a high-efficiency stirrer, and is added with a proper amount of water, and then the mixture is stirred at a high speed for 6min and is pumped to a construction surface by a double-piston pump for construction.
Example 7
The low-cement refractory castable for pumping construction comprises a dry material and an additive, wherein the dry material comprises the following components in parts by weight: 68 parts of refractory aggregate, 14 parts of refractory powder, 6 parts of superfine powder, 7 parts of aluminate cement with the content of alumina being 80 percent and 5 parts of expanding agent, wherein the particle size range of the refractory aggregate is 0.088-15mm, the refractory aggregate is made of corundum, silicon carbide, alumina, hard clay and quartz, and the weight ratio of the materials is as follows: 5:5:1:1: 1; the refractory powder is a refractory aggregate which is further ground, and the particle size of the refractory powder is d1，d1Less than 0.08 mm. The material of the superfine powder comprises alumina powder, silica powder, chromium oxide powder and zirconium oxide powder, the weight ratio of the materials is 3:1:1:1, and the particle diameter of the superfine powder is d2，d2Less than or equal to 45 mu m. The expanding agent comprises quartz substances and spinel substances, and the mass ratio of the expanding agent to the spinel substances is as follows: 3:2. The additive comprises fiber 1.1 wt% of dry material and composite additive 0.2 wt% of dry material, the fiber comprises heat-resistant stainless steel fiber, and the composite additive comprises sulfonic acid formaldehyde condensate, carboxylic acid polymer, alkyl sulfonate, calcium silicate and aluminumCalcium carbonate, polyether polyol and polyester polyol, wherein the weight ratio of the calcium carbonate to the polyether polyol to the polyester polyol is as follows: 5:3:1:1:0.5:0.3:0.6. The alkali metal phosphate polymer is selected from sodium hexametaphosphate, the metal fine powder is simple substance silicon and simple substance aluminum, and the mass ratio of the simple substance silicon to the simple substance aluminum is as follows: 1:1. The sulfonic acid formaldehyde condensate is lignin.
The refractory castable also comprises water, and the weight of the water is 8.5% of the weight of the dry materials. When the dry material is used, the dry material, the fiber and the composite additive are uniformly mixed, then the mixture is added into a high-efficiency stirrer, and is added with a proper amount of water, and then the mixture is stirred at a high speed for 6min and is pumped to a construction surface by a double-piston pump for construction.
Example 8
The low-cement refractory castable for pumping construction comprises a dry material and an additive, wherein the dry material comprises the following components in parts by weight: 68 parts of refractory aggregate, 14 parts of refractory powder, 6 parts of superfine powder, 7 parts of aluminate cement with the content of alumina being 80 percent and 5 parts of expanding agent, wherein the particle size range of the refractory aggregate is 0.088-15mm, the refractory aggregate is made of silicon carbide, alumina and hard clay, and the weight ratio is as follows: 1:1: 1; the refractory powder comprises hard clay and has a particle diameter of d1，d1Less than 0.08 mm. The material of the superfine powder comprises corundum, and the particle diameter of the superfine powder is d2，d2Less than or equal to 45 mu m. The swelling agent comprises spinel substances. The additive comprises fibers accounting for 2.5 percent of the weight of dry materials and a composite additive accounting for 0.5 percent of the weight of the dry materials, wherein the fibers specifically comprise polypropylene explosion-proof fibers, heat-resistant stainless steel fibers and aluminum silicate fibers, and the weight ratio of the fibers to the aluminum silicate fibers is 3:1: 2; the composite additive comprises a sulfonic acid formaldehyde condensate, a carboxylic acid polymer, alkyl sulfonate, calcium silicate, calcium aluminate and polyether polyol, and the weight ratio is as follows: 5:3:1:1:0.5:1.0. The alkali metal phosphate polymer is selected from sodium tripolyphosphate and sodium hexametaphosphate, and the weight ratio is as follows: 3:2, wherein the fine metal powder is simple substance silicon and simple substance aluminum, and the mass ratio of the simple substance silicon to the simple substance aluminum is as follows: 1:1. The sulfonic acid formaldehyde condensate is lignin.
The refractory castable also comprises water, and the weight of the water is 8.5% of the weight of the dry materials. When the dry material is used, the dry material, the fiber and the composite additive are uniformly mixed, then the mixture is added into a high-efficiency stirrer, and is added with a proper amount of water, and then the mixture is stirred at a high speed for 6min and is pumped to a construction surface by a double-piston pump for construction.
Example 9
The low-cement refractory castable for pumping construction comprises a dry material and an additive, wherein the dry material comprises the following components in parts by weight: 68 parts of refractory aggregate, 14 parts of refractory powder, 6 parts of superfine powder, 7 parts of aluminate cement with the content of alumina being 80 percent and 5 parts of expanding agent, wherein the grain diameter range of the refractory aggregate is 0.088-15mm, and the refractory aggregate is made of silicon carbide; the refractory powder comprises silicon carbide and corundum in a mass ratio of 1:1, and the particle diameter of the refractory powder is d1，d1Less than 0.08 mm. The material of the superfine powder comprises alumina powder, and the particle diameter of the superfine powder is d2，d2Less than or equal to 45 mu m. The swelling agent comprises spinel substances. The additive comprises fibers accounting for 1.1 percent of the weight of dry materials and a composite additive accounting for 0.2 percent of the weight of the dry materials, wherein the fibers specifically comprise polypropylene explosion-proof fibers, heat-resistant stainless steel fibers and aluminum silicate fibers, and the weight ratio of the fibers to the aluminum silicate fibers is 3:1: 2; the composite additive comprises a sulfonic acid formaldehyde condensate, a carboxylic acid polymer, alkyl sulfonate, calcium silicate, calcium aluminate, polyether polyol and polyester polyol, and the weight ratio is as follows: 5:3:1:1:0.5:0.3:0.6. The alkali metal phosphate polymer is selected from sodium tripolyphosphate and sodium hexametaphosphate, and the weight ratio is as follows: 3:2, wherein the fine metal powder is simple substance silicon and simple substance aluminum, and the mass ratio of the simple substance silicon to the simple substance aluminum is as follows: 1:1. The sulfonic acid formaldehyde condensate is lignin.
The refractory castable also comprises water, and the weight of the water is 8.5% of the weight of the dry materials. When the dry material is used, the dry material, the fiber and the composite additive are uniformly mixed, then the mixture is added into a high-efficiency stirrer, and is added with a proper amount of water, and then the mixture is stirred at a high speed for 6min and is pumped to a construction surface by a double-piston pump for construction.
And (3) performance test results: the material prepared in example 6 was pumped for 1.5h, and after 3 days of curing, the mold was removed and tested according to the corresponding standards, and the test results are shown in table 1.
Table 1 comparative results of performance tests
| Item | Example 6 |
| Vibration flow value/mm | 205 |
| Flow value/mm | 180 |
| Bulk density (110 ℃ C.)/g-cm-3 | 2.42 |
| Volume density (1300 ℃ C.)/g-cm-3 | 2.38 |
| Flexural strength (110 ℃ C.)/MPa | 8.5 |
| Flexural strength (1300 ℃)/MPa | 11.6 |
| Compressive strength (110 ℃ C.)/MPa | 35.8 |
| Compressive strength (1300 ℃ C.)/MPa | 50.3 |
| Linear rate of change (1300 ℃)/% | -0.15 |
The low-cement refractory castable with higher market purchase and sale quantity is selected for comparison in the market, the vibration flow value is 140mm, the self-flow value is 130mm, and meanwhile, the same pump is adopted for pumping under the same condition, so that the smooth pumping is not realized.
The foregoing embodiments are merely illustrative of the principles of the present invention and its efficacy, and are not to be construed as limiting the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A low cement refractory castable for pumping construction is characterized in that: the low-cement refractory castable for pumping construction comprises a dry material and an additive, wherein the dry material comprises the following components in parts by weight: 55-68 parts of refractory aggregate, 12-27 parts of refractory powder, 3-10 parts of superfine powder and 1-9 parts of bonding agent, wherein the additive comprises fiber and a composite additive, the weight of the fiber is 0.01-3% of the weight of dry materials, the weight of the composite additive is 0.1-0.5% of the weight of the dry materials, and the refractory castable further comprises water, and the weight of the water is 5-12% of the weight of the dry materials.
2. The low-cement castable refractory for pumping construction according to claim 1, wherein: the particle size range of the refractory aggregate is 0.088-15mm, and the refractory aggregate is selected from one or more of corundum, silicon carbide, alumina, hard clay and quartz; the refractory powder is selected from one or more of corundum, silicon carbide, alumina, hard clay and quartz stone, and the particle diameter of the refractory powder is d1，d1Less than 0.08mm, the superfine powder is selected from one or more of corundum, silicon carbide, alumina powder, silicon micropowder, chromium oxide powder and zirconium oxide powder, and the particle diameter of the superfine powder is d2，d2≤45μm。
3. The low cement refractory castable material for pumping construction according to claim 2, wherein: the superfine powder is one or a mixture of two of alumina powder and silica powder.
4. A low cement refractory castable material for pumping construction according to any one of claims 1 to 3, characterised in that: the binding agent is selected from aluminate cement; the alumina content of the aluminate cement is 50-80%.
5. The low-cement castable refractory for pumping construction according to claim 1, wherein: the fiber is selected from one or more of organic fiber and inorganic fiber, the organic fiber is selected from polypropylene explosion-proof fiber, carbon fiber, graphite fiber and pulp waste liquor, and the inorganic fiber is selected from heat-resistant stainless steel fiber, aluminum silicate fiber, glass fiber and asbestos fiber.
6. The low-cement castable refractory for pumping construction according to claim 1, wherein: the composite additive is selected from the mixture of two or more of sulfonic acid formaldehyde condensate, phosphoric acid alkali metal polymer, carboxylic acid polymer, alkyl sulfonate, metal fine powder and sodium alkyl benzene sulfonate.
7. The low cement refractory castable material for pumping construction according to claim 6, wherein: the alkali metal phosphate polymer is selected from one or more of sodium tripolyphosphate, sodium hexametaphosphate, sodium polyphosphate and sodium pyrophosphate.
8. The low-cement castable refractory for pumping construction according to claim 1, wherein: the dry material of the refractory castable also comprises 1.5-10 parts of an expanding agent, wherein the expanding agent is one or a mixture of more of quartz substances, kyanite substances, in-situ synthesized mullite and spinel substances.
9. A low cement refractory castable material for pumping construction according to any one of claims 1 to 8, characterised in that: the dry material of the low-cement refractory castable comprises the following components in parts by weight: 68 parts of refractory aggregate, 14 parts of refractory powder, 6 parts of superfine powder, 7 parts of bonding agent and 5 parts of expanding agent, wherein the additive comprises fiber accounting for 1.1 percent of the weight of dry materials and composite additive accounting for 0.2 percent of the weight of dry materials.
10. The low cement refractory castable material for pumping construction according to claim 6, wherein: the composite additive also comprises one or a mixture of two of calcium silicate and calcium aluminate, and one or a mixture of two of polyether polyol and polyester polyol, wherein the metal fine powder is one or a mixture of two of alkaline earth metals, and the sulfonic acid formaldehyde condensate is selected from lignin.
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| CN111734594A (en) * | 2020-07-03 | 2020-10-02 | 攀钢集团工程技术有限公司 | Pumping method of refractory castable |
| CN113754415A (en) * | 2021-09-09 | 2021-12-07 | 海城利尔麦格西塔材料有限公司 | Composite combined ferronickel rotary kiln castable and preparation method thereof |
| CN113968737A (en) * | 2021-11-05 | 2022-01-25 | 湖南太子新材料科技有限公司 | Sagger for preparing lithium battery electrode material |
| CN115368151A (en) * | 2022-08-18 | 2022-11-22 | 河南省宏达炉业有限公司 | Anti-stripping and steam corrosion resistant refractory castable and preparation method thereof |
| CN115417661A (en) * | 2022-08-18 | 2022-12-02 | 武汉钢铁有限公司 | Tundish dry material, tundish working lining and preparation method thereof |
| CN115894052A (en) * | 2022-09-20 | 2023-04-04 | 宜兴市隆昌耐火材料有限公司 | Wear-resistant and fire-resistant new material for preheater outside kiln and preparation method thereof |
| CN115925431A (en) * | 2022-12-26 | 2023-04-07 | 宜兴瑞泰耐火材料工程有限公司 | High-thermal-conductivity self-flow castable for water-cooled wall and preparation process thereof |
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| CN115925431A (en) * | 2022-12-26 | 2023-04-07 | 宜兴瑞泰耐火材料工程有限公司 | High-thermal-conductivity self-flow castable for water-cooled wall and preparation process thereof |
| CN115925431B (en) * | 2022-12-26 | 2023-09-05 | 宜兴瑞泰耐火材料工程有限公司 | High-heat-conductivity self-flowing castable for water-cooled wall and preparation process thereof |
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