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Formulation (ratio) and application of acid-proof refractory castable

Words:[Big][Medium][Small] Mobile Page Two-Dimensional Code 2018-10-15     

Production of acid-resistant refractory castable aggregate mainly silica, cast stone, wax stone, andesite, diabase and so on.The acid resistance of several used raw materials (% by weight method) is: cast stone 98%, silica more than 97%, clay clinker 92%~97%, wax stone 92~96%, andesite more than 94%.Which kind of material to choose according to the use conditions and.But must pay attention to when using silica quartz heating polycrystalline transition from time to tome, in the process of change will produce volume change (inflation), so it's best to use silica waste silica raw material is expected to replace parts of the aggregate, the configuration of the castable powder mainly adopts silica powder, cast stone powder, porcelain powder, high siliceous clay clinker powder, etc., including casting powder is adopt more acid powder.

The binding agent instant powder sodium silicate should be liquid sodium silicate with a higher content of M, so as to reduce the amount of Na2O brought in by sodium silicate and improve acid resistance. Generally, the modulus is 2.6-3.2 and the density is 1.38-142,g/cm&sup3.Sodium silicate solution.Can be used as a compound of sodium silicate coagulant more, including fluoride compounds (such as fluosilicate, fluoboric acid and fluorine titanium acid alkali metal salt), esters, acids, such as ethyl acetate, metal oxide (such as lead, catalpa, barium oxide), as well as carbon dioxide (CO2), etc., but fluorine sodium silicate (Na2SiF6) is the most widely used, easy to use, easy to control condensation curing time.

The general composition of acid-resistant refractory castable is: acid-resistant refractory aggregate 60%-70%, powder 30%-40%, and the external density is 1.38-1.42g/cm&sup3.13%-16% sodium silicate solution and 10%-12% of sodium silicate solution when fluorosilicate is used as hardening accelerator.

The castable refractory material which can resist the corrosion of 800~1200℃ acid medium (nitric acid, hydrochloric acid, sulfuric acid, acetic acid, etc.) is called refractory acid-resistant castable.It is liquid instant powder sodium silicate as a binding agent, with acid or version of acid refractory as aggregate and powder, plus a small amount of coagulant configuration.But this kind of castable is not resistant to alkali, hot phosphoric acid, hydrofluoric acid and high fat corrosion.This kind of castable has abundant sources of raw materials and low price, so it is widely used in thermal equipment of metallurgy, chemical industry, petroleum, light industry and other sectors.

Acid resistant refractory castable is mainly used for lining of flue and chimney, acid storage tank, pickling tank, pynopyric tower, acid recovery furnace and other containers corroded by acid high temperature gas.



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