Introduction to Castables

Fire resistance is an irregular refractory material. It is an important refractory material. It is a refractory material for high-temperature kiln castables’ inner lining. The density of fire-resistant castable materials, also known as volume density, is one of the important testing items in refractory castable cooking indicators. The volume density index of refractory watering is a comprehensive reflection of the volume of air pores and minerals in the castable material. Generally, the volume density reflects the density of refractory castables after castable water. The volume density of fire-resistant castable materials is g/cm3. Generally speaking, the volume density range of refractory castable materials is 0.4-3.4. The larger the volume density, the higher the volume density of the castable material. The castable material can better resist the erosion of the external slag in the castable inner lining, and the gas tightness of the castable inner lining is better. Depending on the materials, the refractory watering materials are divided into clay castable materials, high aluminum castable materials, Mo Lai stone castables materials, rigid jade castable materials, silicon castable materials, magnesium castables materials, low cement castable materials, wear-resistant castables materials, steel fiber castables Fire -resistant castables materials such as materials. The volume density of...

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Transportation and Storage of Refractory Materials

Transportation of refractory materials and refractory products 1. All refractory materials and refractory products must have factory certificates that meet the design technical conditions. One month before furnace construction, copy the factory test reports of all refractory materials and submit them to the metallurgical furnace major of the design institute or the working group of the design institute on the construction site. Before the product leaves the factory, it should be accompanied by a quality certificate, indicating the product name, brand, inspection results, and factory list (brick number, quantity, factory date, and train number). The shipment and use of refractory materials without product certificates is strictly prohibited. 2. The means of transportation (trains, cars, ships, etc.) for refractory materials and refractory products must be cleaned before shipment and must not be contaminated by oil or other impurities. Refractory materials must be protected from rain and snow during transportation to prevent rain and rainwater from entering. 3. Various clay bricks, high alumina bricks, lightweight bricks, and lightweight standard bricks should be packed in containers or other solid packaging before transportation; standard clay bricks and ordinary clay bricks can be wrapped with straw ropes before transportation. During transportation, care should be taken...

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Castable Construction Acceptance

After the castable construction is completed, the construction site must be inspected and accepted. Only after the acceptance is passed can the next step be carried out. How to carry out the castable construction acceptance work? Next, the editor will tell you. Inspection and acceptance after completion of castable construction 1. During the construction process of castables, a set of test blocks should be set up in every 20m² project to check its strength and other main properties. 2. All covered concealed projects should be inspected and accepted before entering the next process. The inspection items are as follows: Insulation and anchoring bricks, formwork, etc. (check at any time) Anchors and anchoring devices Measures to prevent water loss Buried facilities After the concealed project inspection, the concealed project acceptance form should be filled in and used as one of the construction documents after approval by the construction unit. 3. After the completion of sub-projects, intermediate handover acceptance should be carried out. The inspection items are as follows: Dimensions, lining thickness, and centerline of masonry Material usage Expansion joints, brick joints, levelness, verticality, and surface smoothness Construction of process facilities and process holes Appearance inspection After all projects have been inspected,...

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Steel Fiber Castable Construction Instructions

During the construction process of steel fiber castables, attention should be paid to the following four key links: mixing, pouring, curing, and baking. Problems in any of these links will lead to product performance degradation or failure. Mix 1. Mechanical mixing, equipment and tools: forced mixer, bucket scale, vibrator, tool shovel, trolley, etc. 2. Industrial water consumption: The amount of water added for steel fiber pouring should be controlled at 7-8%, and pure drinking water must be used. 3. Environmental requirements and control The temperature of the construction site must be between 10-25 degrees Celsius. If the temperature of the construction site is lower than 10 degrees Celsius, heating and insulation measures must be taken to complete the construction. If the temperature at the construction site is higher than 30 degrees Celsius, necessary cooling measures must be taken before construction can begin. Otherwise, the product will be difficult to construct or its performance will decrease, making it difficult to construct. 4. Mixing: First pour the bulk materials and small bags into the mixer and dry mix for 3-5 minutes to mix evenly. Add the specified amount of water, accurately weigh out the water required for each mixing, and pour in...

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High Aluminum Castable Construction Instructions

This article details the product packaging, storage, and transportation of high-aluminum castables, on-site construction instructions, maintenance system, baking system, and precautions. Product packaging, storage, and transportation High-aluminum castables are packaged in ton bags + filmed moisture-proof bags. Each bag has a net weight of 50±0.5 kg and contains one bag of admixtures. The warranty period is 60 days. During transportation and storage, attention should be paid to moisture-proof and dry storage. Rain or exposure to the sun is strictly prohibited. On-site construction instructions 1. The construction site must be clean and tidy in advance, and construction equipment and construction surfaces must be clean and tidy. 2. The suitable construction temperature is 30℃, and construction cannot be carried out in a construction environment below 5℃. 3. Use clean drinking water with pH=6-8. The mixing water should be accurately weighed and the added amount should be 6.5-7.5% of the total amount [it can also be increased or decreased appropriately according to the temperature conditions]. 4. It is recommended to use a forced mixer. The mixing must be uniform and the mixing tools must be clean. 5. Stirring sequence: Dry mix for 3 minutes – add the specified amount of water after uniformity...

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How to Pour Corundum Castable

There are certain instructions on how to pour corundum castables during construction. We must pour according to the instructions to prevent secondary rework or damage. So how do we pour? Next, the editor will give Let me give you a brief introduction: 1. Stirring of corundum castable The mixing of corundum castables can be forced by a mixer. Usually, we put the castables into the mixer first, stirred the dry materials for about 2 minutes to make the color uniform, and then add 6-8% of the castable weight of water and stir until the color is uniform. That’s it. It is strictly prohibited to return mixing materials and add water for a second time! 2. Vibration of corundum castable Vibration is used, and the thickness of each layer of pouring cannot exceed 400mm. Each construction part cannot be vibrated for a long time, nor can it be vibrated by hand. It is best to use a plug-in vibrator or a flat vibrator for pouring construction. 3. Maintenance and demoulding of corundum castables Corundum castables can be demoulded 24 hours after the completion of pouring. Watering cannot be done during curing. Usually, the curing temperature is 5-35°C. Baking can be done...

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Common Types of Refractory Bricks

Refractory bricks are a well-known refractory material that is suitable for all walks of life, especially the construction industry and is an indispensable raw material. Do we understand it deeply because it is so close to our lives? Refractory bricks, referred to as refractory bricks, are refractory materials made of refractory clay or other refractory raw materials. In short, they are fire-resistant and high-temperature-resistant bricks. This material is light yellow or brown and is mainly used to build smelting furnaces. It can withstand high temperatures of 1580℃-1770℃. It is also called fire brick and is a refractory material with a certain shape and size. Bricks for different purposes can be made according to the raw materials used, and bricks of different shapes can be made according to the parts used. According to the preparation process, it can be divided into sintered bricks, unsintered bricks, sintered bricks (electrically fused bricks), and refractory insulation bricks. According to the shape and size of refractory bricks, they can be divided into standard bricks, ordinary bricks, and special bricks. High-temperature building materials and structural materials such as refractory clay bricks, high-alumina bricks, silica bricks, and magnesia bricks can be used as building kilns and various...

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The Difference Between Refractory Mud, Refractory Cement, and Refractory Castables

Refractory mud, refractory cement, and refractory castables are all unshaped refractory materials and are commonly used in the refractory industry. Refractory mud is used for building refractory bricks. Refractory mud is also called refractory clay or joint material. Used as joint material for refractory masonry. Refractory cement is a material for making refractory concrete. Refractory castables are made of refractory aggregates, powders, and binders. They are also called castables because of the pouring construction. 1. Refractory Mud Refractory mud can be divided into clay, high alumina, siliceous, and magnesia refractory mud according to materials. It is composed of refractory powder, binder, and admixture. General refractory clay, which is made from refractory clinker powder and an appropriate amount of plastic clay as a binding agent and plasticizer, has low strength at room temperature and has higher strength only when it forms a ceramic bond at high temperatures. The particle size of refractory mud varies according to application requirements. Its ultimate particle size is generally less than 1mm, and some are less than 0.5mm or finer. The materials used for refractory mortar should be considered together with the materials for masonry refractory products. In addition to being used as a joint material,...

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Lightweight Mullite Insulation Bricks

Lightweight mullite insulation bricks are a type of insulation bricks. They are insulating refractory bricks made of mullite as aggregate. Mullite insulation bricks are white and can be directly exposed to flames. They have high refractoriness and are mainly used. Used in hot blast stove tops, blast furnace shafts, and bottoms, glass melting furnace regenerators, ceramic sintering kilns, dead-end furnace linings of petroleum cracking systems, etc. Dimensions of lightweight mullite insulation bricks The dimensions of conventional lightweight mullite insulation bricks are 230 x 114 x 65mm. Lightweight mullite insulation brick model Our common models of lightweight mullite insulation bricks include JM23, JM26, JM28, and JM30. The main difference between them is the content of aluminum oxide and iron oxide. Different contents can withstand fire-resistant temperatures and thermal conductivity. The coefficients and thermal expansion rates are different. Characteristics of lightweight mullite insulation bricks 1. Low thermal conductivity and good thermal insulation effect; 2. Low thermal melt. Due to low thermal conductivity, the mullite series lightweight insulation bricks accumulate very little heat energy, and the energy-saving effect is obvious in intermittent operation; 3. Low impurity content, very low content of alkali metal and other oxides in the iron box, therefore, high refractoriness;...

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How to Choose Vacuum Ladle Castables

A vacuum lifting package is mainly composed of a package body, package cover, lining, aluminum suction tube, ejector, boom, beam, turbine, manual transmission mechanism, inverted aluminum port gland device, etc. It is a commonly used type in the aluminum and electricity industry. Equipment, because the high-temperature liquid aluminum is shipped in the lift package, the main place where refractory castables are used is in its lining. It is necessary to build a refractory castable that can withstand high temperatures and liquid aluminum, but the pouring of vacuum lift packages How should materials be selected? First of all, because the activity of aluminum water is relatively high and has strong permeability when we choose refractory materials, we must ensure that the refractory materials have the functions of resistance to penetration, erosion resistance, impact resistance, and wear resistance. At present, the refractory materials we commonly use The material is mainly non-stick aluminum refractory materials. The non-stick aluminum castable is made of high-alumina bauxite clinker as aggregate, high-alumina bauxite clinker, magnesia mixed and co-ground as powder, and water glass as binder. It has good shock resistance, permeability resistance, and impact resistance. It is a refractory castable commonly used in the aluminum and electricity...

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