The Refractory are divided into Refractory and unshaped refractories, which mainly include various refractory bricks and precast refractory parts, while the non-shaped castable is classified according to its material, combination, construction method, use and characteristics, refractory castables are Refractory.
The castable is a kind of granular and powdery material made of refractory material, which is mixed with a certain amount of binder and moisture in a certain proportion. It has good fluidity under external force and gravity and is suitable for casting. It does not need to be heated to harden the Refractory.
There are three construction methods for filling and compacting with refractory castable: vibration method, gravity flow method and wet spraying method. Generally in the use of the site to cast, vibration or tamping method of pouring molding, but also can be made of prefabricated parts used.
Castable, as a Refractory, should be produced by the appropriate process. If there is a larger material, should first coarse crushing, then fine crushing, and then fine crushing of materials according to particle size screening, and then fine grinding. The finished castable should be maintained. Pay attention to do not affect the bonding layer of hardening, mold removal to timely moisture, the following is a detailed introduction.
1.There are three types of jaw crusher, the specifications of which are indicated by the size of the inlet. The main products are 250mm × 400mm and 600mm × 400mm, production capacity 5-20Th, for bulk materials coarse crushing.
2.Comminution refers to the intermediate and fine comminution of refractory materials after coarse comminution, and is also an important method for preparing granular materials. Its equipment has cone crusher, roller crusher (referred to as roller crusher) and dry mill.
3. Sieving-dividing crushed material into different sizes according to size. The device comprises a fixed inclined screen and an electromagnetic vibrating screen. The former screening efficiency is about 70% , the latter screening efficiency is more than 90% .
4.Fine grinding-refers to the production of refractory powder. Its equipment includes ball mill, tube mill (also known as Tube Mill) and vibration mill.
5.Premixing refers to the various powders or additives, additives, binders, fine powder and other powder for premixing, it is called premixing powder. The equipment for the double spiral cone mixer, batching scales generally use electronic scales, high accuracy. The mixer is a forced mixer, which can load the mixture into the loading machine (the loading machine is equipped with an electronic scale) . It can also be bagged directly from the blender outlet. In addition, there are vertical hoist, belt conveyor and batching trucks and other equipment.
Castable is the main type of Refractory. According to the binder used, the curing mechanism can be divided into three types: hydraulic, pneumatic and hard.
1.Hydraulic castable: the castable with cement as binder needs water to take part in the chemical reaction in the process of hardening, forming cement hardening strength, are water-resistant refractory castable.
Cement is the main factor that determines the strength of castables (especially room temperature strength) , but its fire resistance is relatively low, so after ensuring the necessary room temperature strength, the amount of cement should be reduced as far as possible. If compactness and machinability are required, refractory powders can be added appropriately.
Reducing the amount of cement is also one of the measures to reduce costs. In the construction period, should strictly prevent aluminate cement and Portland cement, lime and other mixing. Due to the mixing of two different chemical components to form tricalcium hydroaluminate, the strength is greatly reduced.
2. Refractory castable: this means that during the curing process the adhesive absorbs CO2 from the air and gradually solidifies and hardens. The commonly used refractory castable is water glass refractory castable. In addition to high temperature resistance, water glass refractory castables also acid and wear resistance, and therefore commonly used as chemical equipment lining. The process of hardening water glass refractory castables under natural conditions is very slow, and coagulants (sodium fluorosilicate, high alumina cement, etc.) are added during construction.
The concrete use steps of the castable are as follows:
1.This castable is a finished bulk material. It should not be placed in an open or wet place during storage. It should not be used in combination with other products.
2. When the construction machine and the mould are completely ready, add the castable according to the capacity of the blender, add the small bag of adhesive to each bag and dry mix for 5-6 minutes, then add about 13% water bag (6.5 kg) to each bag, mix wet for 5-6 minutes before use.
3. Mixed castables should be poured within 30 minutes. If the wet mixture is left in place for too long, the castable material initially installed shall not be used. Therefore, the template and the vibrator must be prepared before mixing. Four. The pouring of the lining needs to be maintained naturally and can be covered without sprinkling. The initial setting time was 3 hours, and the final setting time was 18 hours before mold release.
1.The quality of castable has a great influence on the maintenance work after mould dismantling. The Binder of castable has a certain curing time and hardening time after curing, thus obtaining enough initial strength. So this is important.
2. After demoulding, cover the surface of the castable with a wet bag or pad. And timely watering to keep wet state, some inconvenient places. Spray can be used to spray water on the surface. Softened water should be used on the first day.
3. Maintenance also need to pay attention to some issues, such as silicate castable suitable for watering maintenance. It is more important for high alumina cement castable. Wet curing should be done after the castable hardens. However, phosphoric acid castables can not be cured with water and natural gas and need to be cured in a dry environment.
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