Uniform heating system and method for modifying ground calcium carbonate powder

The invention discloses a uniform heating system and method for modifying heavy calcium carbonate powder. The system comprises a spiral heater and a rotary dispersion heater; the spiral heater is fixed through an arranged spiral heater supporting frame; the spiral heater comprises a heater body, an inner cavity of the heater body is of a funnel-shaped structure, and spiral heating rollers are further distributed in the inner cavity; the spiral heating roller is of a structure with a wide upper part and a narrow lower part, and a spiral downward conveying heating groove is formed in the surface of the roller body of the spiral heating roller; a hot oil circulating channel which is spirally upward is correspondingly formed in the roller body; and the rotary dispersion heater is distributed below the spiral heater and is connected with the discharge opening of the spiral heater. By adopting a double-heat-source heat supply mode combining gas heating and electric heating, the powder heating balance and stability