Composition for manufacture of heat-resistant concretes on the basis of iron-containing slag from thermal power station and ortho-phosphoric acid

Abstract

The overall performance of all industries must be estimated from the point of view of the balance between the main product mass and the volume technogenic waste products formed. The researches have shown that phosphate binder, produced by tempering of iron-containing slag from thermal power station and 70 % ortho-phosphoric acid, begins to fasten in 45 – 50 min and solidifies in 2 – 2.5 h. Subsequently, when the contents of iron orthophosphates in cement stone increases, its strength grows roughly directly proportional to solidification time in the air conditions, and after seven days it can be stabilized at level of 45.0 – 50.0 МПа. Upon introducing aluminum-containing dead-catalyst into the composition of iron-containing slag from thermal power station with ortho-phosphoric acid, the refractoriness of mixed iron-phosphate binding agent increases to practically directly proportional to the value of aluminum oxide contents.