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CN-121990817-A - Rare earth erosion-resistant main channel refractory castable and pouring method thereof

CN121990817ACN 121990817 ACN121990817 ACN 121990817ACN-121990817-A

Abstract

The invention relates to the technical field of castable, in particular to a rare earth erosion-resistant main channel refractory castable and a pouring method thereof, wherein the castable comprises, by weight, 38-82 parts of brown corundum, 2-8 parts of compact corundum, 4-20 parts of platy corundum, 1-5 parts of spherical asphalt, 7-12 parts of silicon carbide, 5-10 parts of active alumina powder, 2-5 parts of silica powder, 5-10 parts of rare earth modified powder, 1-5 parts of aluminate cement, 0.5-3 parts of metal silicon powder, 0.05-0.3 part of metal aluminum powder, 0.02-0.1 part of boron carbide, 0.02-0.2 part of anti-explosion fiber, 0.05-0.2 part of water reducer and 0.01-0.1 part of dispersing agent. According to the invention, the flaky rare earth lanthanum cerium oxide and other materials are subjected to high-efficiency ball milling treatment, the oxidation resistance and the thermal stability of the main channel castable are further enhanced by precisely controlling the ball milling time and the ball-to-material ratio, the blast furnace slag erosion resistance of the main channel castable is greatly improved, the service cycle of the equipment in a high-temperature and high-pressure environment is effectively prolonged, and the maintenance and replacement cost of enterprises is remarkably reduced.

Inventors

  • ZHANG WEI
  • HU SHANSHAN
  • FAN XILI
  • Su Rigala
  • GAO XUDONG
  • LI XIN
  • WANG JIPING
  • ZHANG JUN
  • CAO JIANWEI
  • PAN LU
  • CHEN LIBING
  • Qiao Jiawang
  • Wang Guaishuang
  • CHEN SHIKUN

Assignees

  • 包头市安德稀耐新材料有限公司

Dates

Publication Date
20260508
Application Date
20260317

Claims (10)

  1. 1. The rare earth erosion-resistant main channel refractory castable is characterized by comprising, by weight, 50-120 parts of aggregate, 10-30 parts of fine powder, 1-5 parts of binding agent, 0.02-0.2 part of explosion-proof fiber and 0.01-0.5 part of additive, wherein: The fine powder contains rare earth modified powder, and the rare earth modified powder is obtained by mixing and ball milling flaky rare earth lanthanum cerium oxide, silicon carbide and functional auxiliary agents.
  2. 2. The rare earth erosion resistant main channel refractory castable according to claim 1, wherein the rare earth modified powder is obtained by mixing and ball milling flaky rare earth lanthanum cerium oxide, silicon carbide and boric acid.
  3. 3. The rare earth erosion resistant main channel refractory castable of claim 2, wherein the rare earth modified powder is prepared by one of the following: a) Mixing the flaky rare earth lanthanum cerium oxide, silicon carbide and boric acid according to the weight ratio of 1:2.7:0.3, performing dry ball milling, and sieving with a 200-mesh sieve to obtain the rare earth lanthanum cerium oxide-boric acid composite material; b) Mixing the flaky rare earth lanthanum cerium oxide, graphite and silicon carbide according to the weight ratio of 1:1.3:1.7, performing dry ball milling, and sieving with a 200-mesh sieve to obtain the rare earth lanthanum cerium oxide-silicon carbide composite material.
  4. 4. A rare earth erosion resistant main channel refractory castable as claimed in claim 3, wherein the dry ball milling time is 2-8 hours and the screened screen residue is less than 3%.
  5. 5. The rare earth erosion resistant main channel refractory castable as set forth in claim 1, wherein said aggregate comprises brown corundum, dense corundum and silicon carbide with different particle sizes, said fine powder further comprises platy corundum, activated alumina powder, silica powder, metal aluminum powder, spherical asphalt and boron carbide, said binder is aluminate cement, and said admixture comprises a water reducing agent and a dispersing agent.
  6. 6. The rare earth erosion-resistant main channel refractory castable according to claim 1, wherein the castable comprises, by weight, 38-82 parts of brown alumina, 2-8 parts of dense corundum, 4-20 parts of plate-shaped corundum, 1-5 parts of spherical asphalt, 7-12 parts of silicon carbide, 5-10 parts of active alumina powder, 2-5 parts of silica powder, 5-10 parts of rare earth modified powder, 1-5 parts of aluminate cement, 0.5-3 parts of metal silicon powder, 0.05-0.3 part of metal aluminum powder, 0.02-0.1 part of boron carbide, 0.02-0.2 part of explosion-proof fiber, 0.05-0.2 part of water reducer and 0.01-0.1 part of dispersant.
  7. 7. The rare earth erosion resistant main channel refractory castable according to claim 1, wherein the castable comprises, by weight, 5-15 parts of brown corundum with a particle size of 8-15 mm, 16-27 parts of brown corundum with a particle size of 5-8 mm, 7-15 parts of brown corundum with a particle size of 3-5 mm, 10-25 parts of brown corundum with a particle size of 1-3 mm, 2-8 parts of dense corundum with a particle size of 0-1 mm, 2-10 parts of plate-like corundum with a particle size of 200 meshes, 1-5 parts of spherical asphalt with a particle size of 0-2 mm, 7-12 parts of silicon carbide with a particle size of 0-1 mm, 2-5 parts of silicon micropowder, 5-10 parts of rare earth modified powder, 5-10 parts of activated alumina powder, 1-5 parts of aluminate cement, 0.5-3 parts of metal silica powder, 0.05-0.3 part of metal aluminum powder, 0.02-0.1 part of boron carbide, 0.02-0.2 part of explosion-proof fiber, 0.05-0.2 part of water reducer, and 0.01-0.01 part of dispersant.
  8. 8. A method of casting a rare earth erosion resistant main channel refractory casting material according to any one of claims 1 to 7, comprising the steps of: S1, preparing rare earth modified powder, namely mixing flaky rare earth lanthanum cerium oxide, silicon carbide and functional additives in proportion, and performing dry ball milling and sieving to obtain rare earth modified powder; s2, proportioning and mixing, namely weighing the raw materials according to the weight portions of any one of claims 1-7, firstly stirring and mixing aggregate composed of brown corundum, compact corundum and silicon carbide, then adding anti-explosion fibers for stirring, then adding fine powder composed of platy corundum, activated alumina powder, silicon micropowder, metal silica powder, metal aluminum powder, rare earth modified powder, spherical asphalt and boron carbide and a binding agent for stirring, and finally adding a water reducing agent and a dispersing agent for stirring until the materials are uniform; s3, adding water and stirring, namely adding water into the uniformly mixed dry material obtained in the step 2, wherein the water addition amount is 4-6% of the total weight of the dry material, and continuously stirring until the materials are uniformly mixed and have viscosity; S4, injecting the stirred materials into a mold, and compacting through vibration; and S5, curing and firing, namely naturally curing, demolding and drying the molded castable, firing at high temperature and then cooling along with a furnace.
  9. 9. The casting method of the rare earth erosion resistant main channel refractory castable according to claim 8, wherein in S2, the aggregate stirring time is 2 minutes, the mixture is stirred for 1 minute after adding the anti-explosion fiber, the mixture is stirred for 3 minutes after adding the fine powder, and the mixture is stirred for 2 minutes after adding the additive; And S4, vibrating and compacting for 2-3 minutes on a vibrating table with the frequency of 50 Hz.
  10. 10. The pouring method of the rare earth erosion resistant main channel refractory castable according to claim 8, wherein in the step S5, the natural curing time is 24 hours, the drying condition is that the castable is baked at 110 ℃ for 24 hours, the firing schedule is specifically that the temperature is raised from room temperature to 1000 ℃ for 170 minutes, the temperature is kept for 30 minutes, the temperature is raised to 1450 ℃ for 150 minutes, and the temperature is kept for 3 hours.

Description

Rare earth erosion-resistant main channel refractory castable and pouring method thereof Technical field: The invention belongs to the technical field of castable, and particularly relates to a rare earth anti-erosion main channel refractory castable and a pouring method thereof. The background technology is as follows: With the development of new steel technologies, the used refractory material technologies are also changed and developed across the times, iron-making technologies are developed greatly by steel plants at home and abroad by utilizing the current opportunities, the effective volume of a blast furnace is continuously increased, the load of an iron tapping system is increased by the improvement of the smelting technologies, and the higher requirements on the iron flux of a main hook and a slag runner are continuously put forward, so that the erosion damage degree of the refractory material of the main runner castable is increased, and the maintenance cost is continuously increased. The main channel of the blast furnace is the main channel of high-temperature molten iron, and the castable of the main channel is an unshaped refractory material for the main channel of the blast furnace, and is one of the main refractory materials for the front of the blast furnace, accounting for more than 45 percent. During the use of the blast furnace, the main ditch is subjected to scouring from molten iron and thermal shock damage caused by abrupt temperature change, and if the main ditch cannot be repaired in time, serious safety accidents such as burning through of the main ditch can be caused, so that the safety of a stokehole worker and the tapping process of the blast furnace are seriously influenced. The quality of the main channel castable, the service life, the iron flux and the production cost, the labor intensity and the working environment are directly affected. This is not in line with the current requirements for large-scale and long-life blast furnaces. Therefore, the refractory material used for the main channel of the blast furnace is extremely important. With the rapid development of smelting technology, the production capacity of the blast furnace is obviously improved, and a series of new problems such as the acceleration of tapping speed, the temperature rise of molten iron and iron slag, the increase of tapping amount and the like are caused by the change, and the problems have great challenges on the performance of the unshaped refractory materials used in the main runner, namely the aggravation of the erosion damage degree and the acceleration of the erosion speed of the refractory materials of the main runner, and the repair cost is greatly improved, so that the traditional iron runner materials have difficulty in meeting the tapping speed requirement of the blast furnace after development. Rare earth elements are known as industrial monosodium glutamate and new material, and the reputation is derived from the wide and key application field. Rare earth plays an indispensable role in traditional industries such as electronics, petrochemical industry, metallurgy, machinery and the like, and plays an increasingly important role in modern high and new technology industries such as new energy, light industry, environmental protection, agriculture and the like. It can be said that rare earth elements have various functions and profound effects, and are one of the base materials that are difficult to replace in modern industrial systems. In addition, rare earth oxides have a range of excellent physicochemical properties, in particular their extremely high melting points, typically exceeding 2000 ℃, and exhibit excellent high temperature resistance characteristics. Meanwhile, the oxide also has good oxidation resistance, alkali resistance and excellent thermal stability, so that the oxide can still maintain structural integrity and stable performance under severe environments such as high temperature, strong corrosion and the like, and is widely used in the fields of refractory materials, catalysts, functional ceramics and the like. Under long-term high-temperature slag flushing, the main runner castable in the prior art is easy to loose in structure, peel off at interfaces and erode and permeate, so that the service life is short, the replacement is frequent, the continuous operation of the blast furnace is affected, and the maintenance cost is increased. Although attempts have been made in the prior art to add rare earth oxides to improve refractory properties, direct mechanical mixing or simple incorporation of the original rare earth powder is generally employed. The method is difficult to realize the highly uniform dispersion of the rare earth component in the matrix, the full play of the efficacy is easily affected due to agglomeration, and the interface combination with the matrix material is weaker, so that the rare earth function is not fully played, and the oxidation resistance and er