Double shaft mixer has high mixing speed and good uniformity; it can be added into sticky material which contains 30% liquid.after mixer; the blended materials can be continuously sent to the conveyor, transmit to the next equipment. When working, the two paddle rotors which do counter rotating are mixing in the middle. As to the paddle has many special angles, no matter the materials' shape, size, and density, the materials is mixed quickly and effectively. Adopt downward door, the speed of discharging is quickly, residual quantity is small.Double shaft mixer is used for coal, coal slurry, fly ash, sludge, mineral powder, clay, oxidation iron.