Low grade doromitic phosphate rocks have no direct use and are rejected all over the world. Substantial amounts of such low grade phosphorites are found along with high grade ore in some areas of Hazara (Pakistan). In the method described, thermal beneficiation is carried out to see the effect of temperature, time and particle size for the low grade dolomitic phosphorites of Hazara. Under various parameter conditions the rock is heated and quenched. The concentrates obtained from the ore assaying 16% P2O5 content after desliming are enriched to a product containing 31-34% P2O5 without using any expensive chemicals or energy required in conventional flotation and calcination methods.