Ramming material phosphoric acid phosphate refractory castables are made of phosphoric acid phosphate solution refractory aggregates powders in a certain proportion. The ramming material is a new type of refractory with good performance.
Commonly used binding agents are phosphoric acid, aluminum dihydrogen phosphate, polyphosphate so on.
A. Phosphoric acid aluminum phosphate combined refractory castables are divided into phosphoric acid combined refractory castables aluminum phosphate combined refractory castables according to the type of cement. The refractory aggregates powders used usually include bauxite clinker, clay clinker, magnesia, waste silica bricks silica, corundum, mullite, silicon carbide, etc. Lightweight aggregates include expanded perlite hollow alumina balls. According to the types of aggregates, it can be divided into high-alumina, clay, siliceous magnesium. Phosphoric acid aluminum phosphate reacts slowly with neutral acidic aggregates (such as waste silica bricks silica) at room temperature. In order to promote the hardening of castables at room temperature, hardeners such as alumina cement, calcium aluminate cement, oxidation Magnesium etc. Phosphoric acid aluminum phosphate reacts with the iron contained in the raw materials used to affect the aging change, it also has a corrosive effect on the mixer when mixing the mud. Therefore, aging inhibitors are often added to the ingredients, such as 0.15% NH-66 inhibitor. If no inhibitor is added, the material should be trapped after stirring. In addition, phosphoric acid phosphate combined refractory castables should avoid water steam curing. Phosphoric acid phosphate refractory castables are characterized by good thermal shock stability, high compressive strength, slag corrosion resistance impact resistance, high load softening temperature chemical stability. Its use temperature is between 1000~1800°C depending on the variety grade of raw materials. The technical properties of phosphoric acid phosphate refractory castables are shown in the table below. Technical performance of phosphoric acid phosphate combined refractory castable B. Sodium polyphosphate combined refractory castable. When magnesium material is used as refractory aggregate powder, because the reaction between phosphoric acid aluminum phosphate solution magnesium material is intense, The mixture is quick-setting has no construction time, so sodium polyphosphine is used as the binder. Commonly used are sodium tripolyphosphate, sodium hexametaphosphate so on. Magnesium refractory castables are easy to hydrate. Drying process is easy to produce cracks. Adding an appropriate amount of silica powder can overcome the hydration problem, but the amount of silica that affects the high temperature performance of the material should be controlled. Almagnesia alumina spinel refractory castables are castables developed for ladle. The refractory aggregate is corundum, special grade bauxite clinker, the powder is magnesia-aluminum spinel powder, bauxite clinker powder, corundum powder magnesia powder, etc. The bonding agent is silica powder sodium polyphosphate.