CLAY-PHOSPHATE MATERIAL Russian patent published in 2006 - IPC C04B28/34 C04B33/132 

FIELD: manufacture of building materials.

SUBSTANCE: novel clay-phosphate material comprising loamy soil, iron-containing metallurgical waste with residue on screen no. 008, which contains 7-11 wt % of ferrous oxide and orthophosphoric acid with density 1.24-1.25 g/cc, additionally contains wood sawdust, so that material is finally composed of, wt %: loamy soil 60-63, metallurgical waste 7-11, wood sawdust 10-15, and orthophosphoric acid - the rest. Invention can be used in manufacture of construction blocks.

EFFECT: reduced heat conductivity at the same waterproofness.

1 tbl