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24
2023
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07
The solution of alkali return of casting material
Regarding castables (including ordinary cement concrete and refractory castables) alkali return phenomenon is common, especially in high temperature and high humidity environment, high cement addition formula, such as lightweight materials.
Regarding castables (including ordinary cement concrete and refractory castables) alkali return phenomenon is common, especially in high temperature and high humidity environment, high cement addition formula, such as lightweight materials. This situation exists in any high alumina cement, of course, with A900 or the introduction of hardening agent (lithium carbonate or lithium hydroxide) or special alkali return agent (ordinary cement concrete is used in large quantities) the effect will be much better, and low cement heavyweight castables (aggregates, especially pay attention to the fines and 0-1 aggregates, it is easy to introduce free calcium and other impurities caused by the return of alkali).
Solution:
Refractory castables occur back to alkali phenomenon do not have to be too alarmed, if it has been in the use of refractory castables this phenomenon should be done as soon as possible after the casting of the mold drying, to eliminate moisture, eliminate the casting of the body of the carrier of the sodium salt, so that alkali stagnation in the construction of the body, and no longer migrate to the surface, if you can't dry in time to do a good job of casting the environment airtight, covered with plastic film on the surface, so as to stop the moisture carries alkali to the surface of migration. Surface migration.
The second way to solve the problem from the refractory castables themselves, the method is to choose low alkali content of refractory raw materials, improve the viscosity of refractory castables and fast hardening so as to reduce the rate of migration of sodium salts, and do a good job of strengthening quality management, strict control of the amount of water added to prevent the addition of too much water. So the proportion of cement and fine powder and other fine materials should be reasonable, generally no more than 30%, the more fine powder, the more water, the more holes, the more likely to return to alkali.
Third, for the choice of powder, the category as high as possible (high category aggregate burning relatively more transparent, less impurities), aggregate aging time as long as possible (wind and rain is conducive to the decomposition of free calcium and other alkaline substances), fine powder and 0-1 aggregates are easy to mix high alkali or sulfur-containing impurities, resulting in the return of alkali or not hardened.
The solution of alkali return of casting material
2023-07-24
Regarding castables (including ordinary cement concrete and refractory castables) alkali return phenomenon is common, especially in high temperature and high humidity environment, high cement addition formula, such as lightweight materials. This situation exists in any high alumina cement, of course, with A900 or the introduction of hardening agent (lithium carbonate or lithium hydroxide) or special alkali return agent (ordinary cement concrete is used in large quantities) the effect will be much better, and low cement heavyweight castables (aggregates, especially pay attention to the fines and 0-1 aggregates, it is easy to introduce free calcium and other impurities caused by the return of alkali).
Solution:
Refractory castables occur back to alkali phenomenon do not have to be too alarmed, if it has been in the use of refractory castables this phenomenon should be done as soon as possible after the casting of the mold drying, to eliminate moisture, eliminate the casting of the body of the carrier of the sodium salt, so that alkali stagnation in the construction of the body, and no longer migrate to the surface, if you can't dry in time to do a good job of casting the environment airtight, covered with plastic film on the surface, so as to stop the moisture carries alkali to the surface of migration. Surface migration.
The second way to solve the problem from the refractory castables themselves, the method is to choose low alkali content of refractory raw materials, improve the viscosity of refractory castables and fast hardening so as to reduce the rate of migration of sodium salts, and do a good job of strengthening quality management, strict control of the amount of water added to prevent the addition of too much water. So the proportion of cement and fine powder and other fine materials should be reasonable, generally no more than 30%, the more fine powder, the more water, the more holes, the more likely to return to alkali.
Third, for the choice of powder, the category as high as possible (high category aggregate burning relatively more transparent, less impurities), aggregate aging time as long as possible (wind and rain is conducive to the decomposition of free calcium and other alkaline substances), fine powder and 0-1 aggregates are easy to mix high alkali or sulfur-containing impurities, resulting in the return of alkali or not hardened.
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