NOVELTY - Process for separating heavy metals from phosphoric starting material involves heating starting material to temperature of 600-1200 degrees C in first reactor (1) and withdrawing combustion gas; using combustion gas to preheat alkaline source; and transferring heated starting material and heated alkaline source to second reactor (20), adding elemental carbon source, heating to temperature of 700-1100 degrees C and withdrawing process gas and product stream.    USE - For separating heavy metals from phosphoric starting material (claimed), for producing phosphate fertilizers.    ADVANTAGE - The present method provides reliable separation of heavy metals from phosphoric material in energy efficient way which is also easier to operate and less cost intensive than the processes of the prior art. Since the major amount of flue gas is generated in first reactor, the dimensions of second reactor can be reduced. Furthermore, there is no need to heat gaseous compounds in the second reactor which are not used in the reaction, thus drastically reducing energy requirements compared to conventional processes. Application of the product as phosphate fertilizer is more environmental friendly than using conventional mineral fertilizers or recycled organic fertilizers.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for plant for separating heavy metals from phosphoric starting material comprising first reactor (1) for heating starting material, first preheating stage (2) for preheating starting material, second preheating stage (11) for heating alkaline source, and second reactor (20) for heating pre-heated starting material and the pre-heated alkaline source as well as elemental carbon source having at least one line (21) for withdrawing process gas and at least one product line (22) for withdrawing product stream.    DESCRIPTION OF DRAWING(S) - The figure shows simplified block diagram of plant implementing the process of separating heavy metals from phosphoric starting material.    First reactor (1)    First preheating stage (2)    First preheating stage (11)    Second reactor (20)    Line (21)    Product line (22)