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Classification of unshaped refractory materials

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Industry News

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2024-03-25

According to the classification of construction technology, amorphous refractory materials can be divided into the following eight categories:
(1) Pouring refractory materials, a dry state refractory mixture, mixed with liquid (water or liquid binder) during construction, formed and allowed to solidify and harden after a certain period of rest, thus endowing the material with a certain structural strength. The pouring of refractory materials can be divided into vibration pouring materials, self flowing pouring materials, and pump pouring materials.
2) Self flowing castables generate flow based on their own weight and potential energy difference, and can automatically fill the model and level the surface.
3) Pumped pouring of castable is achieved by using a mud pump to pump the castable into the model, which can also automatically fill the model.
(2) Rammed refractory materials, non plastic or low plastic refractory mixtures in a semi wet or wet state, constructed using the ramming method. After construction, they harden by heating and baking, and have a certain structural strength.
(3) Plastic refractory materials, refractory materials with a certain degree of plasticity, can be constructed using ramming or spraying methods. After construction, it must be naturally dried or heated and baked to achieve the required structural strength. Plasticizing materials must be added to plastic materials, which are mostly plastic clay. Some organic plasticizers can also be used to improve their plasticity.
(4) Spraying refractory materials is a refractory mixture used for spraying construction using a dedicated spraying machine and high-speed airflow as the carrier. According to the spraying process technology, the spraying methods can be divided into cold material spraying method and molten material spraying method (referred to as melt spraying method).
1) The material spraying method can be further divided into dry method, semi dry method, wet method, mud method, and mixed spraying method.
2) The molten material spraying method can also be divided into flame spraying method, plasma spraying method, and slag splashing furnace protection method.
Spray refractory materials can be used to construct new linings (spray coatings) and repair damaged linings (spray repair materials).
(5) Apply (cover) refractory materials, which are refractory mixtures in the form of mud paste or mud. It can be applied manually or by brushing, as well as by mechanical spraying or pouring. It is generally used as a joint material or grouting material for refractory masonry, and as a protective layer or working layer for refractory lining, including refractory mud and refractory coatings.
(6) Squeezing (injection) refractory materials, a mixture of materials used for extrusion or injection construction using specialized extrusion or injection machines. It can be divided into hard extruded materials and soft injection materials. Hard extruded materials are plastic materials, such as blast furnace slurry and hot extruded repair materials for blast furnaces; Soft injection molding material is a viscous and plastic mortar like material, which is used between refractory product masonry or between refractory product masonry and furnace shell.
(7) Shooting (throwing) refractory materials, refractory mixtures thrown by manual throwing or projection machines, such as magnesium carbon hot repair materials for large-scale repair of converter lining and hot repair materials for electric furnace bottom, as well as silicon steel ladle projection materials that have been used in the past.
(8) Dry vibration (or filling) refractory materials, dry refractory mixtures mixed without liquid (water or liquid binder), can be directly filled in the gap between the mold tire and the lining shell during construction (such as induction furnace lining, dry intermediate ladle working lining), or filled in the flow port composed of fire-resistant lining (such as ladle drainage material, electric furnace outlet drainage material). But for dry vibration materials used as work lining, after filling, they must