The dry process purification system of five types of feeding equipment or devices is briefly introduced, and the various equipment performances are analyzed. The latest “unpowered & automatic discrete” aluminaAlumina feeding technology and equipment are introduced in detail. “Throw” way by the gas turbulentTurbulent effects only makes the material “passively” mixed with fume, this approach does not require energy consumptionEnergy consumption or power consumption is low, but the mixingMixing effect is poor, and gas–solid mixing is non-uniformUniform. The mixingMixing effect of spray feeding mode is good, but it needs additional energy consumptionEnergy consumption and has negative effect on the system energy conservation and emissionsEmissions reductionReduction. The “unpowered & automatic discrete” with the new technology of feeding equipment structure is better than others and has found industrial application. This technology provides a new feeding control train of thought for the colleagues as a reference.