Patent ID: 7524452

Claim:
A low temperature process for making radiopac materials utilizing industrial/agricultural waste as raw materials, said process comprising the steps of: a) mixing 11 - 88% w/w of said industrial/agricultural waste materials, 11-88% w/w of an alkali or alkaline earth metal compound and 7-15% w/w of a phosphatic binder to obtain a homogenized mixture, b) compressing said homogenized mixture at a pressure in the range of 100-300 Kg/cm 2 to obtain compacted green material samples, c) baking said compacted green material samples for 1-3 hours in an Air oven in the temperature range of 90-130° C., and d) sintering at a temperature in the range of 920 to 1300° C. for a soaking period of 1-3 hours under air environment in a muffle furnace to obtain the said radiopac material, wherein said industrial/agricultural waste materials comprise fly ash, red mud, pyrophyllite and rice husk silica, and wherein pyrophyllite comprises silica 66%, alumina 23-25%, iron oxide 2-3%, titanium oxide 0.98-1.3%, magnesium oxide 0.5 0.82%, calcium oxide 1-2%, potassium oxide 0.37-0.50% and sodium oxide 0.13-0.25%.