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 mineral fertilizer production waste with residue on screen no. 008, which contains 95-98% of Na₂SiF₆, so that material is finally composed of, wt %: loamy soil 70-73, metallurgical waste 4-8, mineral fertilizer production waste 1-3, and orthophosphoric acid - the rest. Invention can be used in case of neutralizing alkaline effluents.

EFFECT: imparted alkali neutralizing properties.

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