Silica powder feeding system

The invention provides a silicon powder feeding system. The silicon powder feeding system comprises a silicon powder feeding tank, an emptying unit, a copper powder feeding tank and a fluidized bed reactor, a plurality of coil pipes are coiled on the outer wall of the silicon powder feeding tank, a heating medium in the coil pipes is heat conduction oil, and a nitrogen inlet is formed in the bottom of the silicon powder feeding tank; a gas phase outlet of the silicon powder feeding tank is fixedly connected with the emptying unit, a discharging port of the silicon powder feeding tank is fixedly connected with a feeding port of the fluidized bed reactor through a conveying pipeline, and the copper powder feeding tank is fixedly connected with a mixture inlet of the silicon powder feeding tank through a conveying pipeline. According to the silicon powder feeding system, silicon powder and copper powder are heated and evenly mixed before reaction, the temperature stabilizing time of the fluidized bed reactor is