Phosphate castables are very different from the main materials for aluminum silicate castables. For example, if the phosphate castables are improperly operated, they will cause the material to erupt, increase the porosity, reduce the structural strength, shorten the service life, and increase additional production costs.
The construction method of phosphate castables is different from other high-aluminum and corundum castables.
Phosphate castable
1. Essential difference
The aluminum phosphate, phosphoric acid and neutral and acidic aggregates in the phosphate castable only react slowly at room temperature. In order to give the castable the room temperature hardening performance, a hardener must be used.
Aluminum silicate castables are different. Aluminum silicate castables generally use clay clinker or bauxite clinker as refractory aggregates and powders, and the amounts are 65% to 74% and 24% to 35%, respectively.
2, configure the production process
Phosphate castable is made of bauxite clinker and powder as the main raw materials, aluminate cement as the binding agent, and a variety of admixture materials are added. When used, it is necessary to add aluminum dihydrogen phosphate solution for stirring. Chemically combined castables.
Aluminum silicate castable generally refers to high-aluminum castables, low-cement castables, etc. It is made up of bauxite clinker and powder as the main raw materials, aluminate cement as the binder, and more than 4 additives. Need to add water to stir when stirring, it belongs to hydration combined castable.
3, construction process
Phosphate castables need to add aluminum dihydrogen phosphate solution for stirring, it is easy to chemically react with the iron in the material to produce hydrogen gas, accompanied by volume expansion. Therefore, its construction process has two steps, firstly it needs to be mixed for trapping, and then mixed for pouring construction. Mixing is to mix the phosphate castable with aluminum phosphate solution (5%) uniformly. Aluminum-plastic salt cement can not be added to make the solution and the material chemically react, eliminate hydrogen, and leave it for more than 8 hours (commonly known as trapped material); First mix the trapped material with the 10% solution evenly, then add aluminate cement for mixing, and the mixture can be directly poured for construction.
Aluminum silicate castable dry material is mixed evenly-water is added and mixed evenly-pouring construction. First mix the dry materials evenly. The amount of water added should be added in two batches according to the amount of water provided by the manufacturer. Add about 80% first, and observe the dryness and wetness of the material. Add the remaining 20% ??of the water, mix well, and then directly pour the construction. . In this process, the refractory aggregates and powders need to be weighed and mixed according to the requirements of the mixing ratio, and 3/5 solution of the amount of the binding agent is added, and the mixing is continued, and the material is trapped; secondly, the trapped mixture is weighed , Add CA-50 cement accelerator and mix evenly, then add the remaining binder, stir for 3～5mm, and remove the mold one day after molding.
4, maintenance
Phosphate castables are cast and placed for about 8 hours to remove the molds. The construction environment temperature is different, and the time is different. Increasing the construction environment temperature can shorten the mold removal time. After removing the mold, cover with plastic film for curing. The curing time varies according to the temperature.
Aluminum silicate castables can be demoulded within 4-8 hours after being cast and molded. The compressive strength is greater than 13Mpa and the drying compressive strength is 29.1～35.1Mpa. It can be demoulded and covered with plastic film for curing. The curing time is about 3 days.
5. Baking method
Phosphate castable pouring construction temperature is about 15-20 temperature, it needs curing for about 5 days before it can be put into use.
After the curing of the aluminum silicate castable is completed, the plastic film is removed and natural curing is carried out for one day, and then it is baked. Because the cast lining contains a lot of water, if it is used directly without baking, it will cause the lining to crack and peel. The baking temperature should be increased slowly from low to high temperature, and it should be implemented strictly in accordance with the heating curve provided by the manufacturer.
The above is the introduction of the difference between phosphate castable and aluminum silicate castable by the editor of refractory castable manufacturer. The construction of aluminum silicate castable is much simpler, and its dosage depends on the construction conditions and the strength requirements at room temperature. Phosphate castables do not react under normal temperature conditions, so hardeners are needed to help. Generally speaking, there are many construction procedures for phosphate castables, while aluminum silicate castables are easier. But different castables have different functions, so you need castables, spray coatings, ramming materials, gun mud, high alumina bricks, silica bricks, slag ball, refractory preforms, refractory aggregate fine powder, clay and other refractory Products, our company can provide OEM services according to user needs.
Wechat Us 
